US20050223536A1 - Gasket, method of manufacturing and apparatus for manufacturing same - Google Patents
Gasket, method of manufacturing and apparatus for manufacturing same Download PDFInfo
- Publication number
- US20050223536A1 US20050223536A1 US10/221,561 US22156103A US2005223536A1 US 20050223536 A1 US20050223536 A1 US 20050223536A1 US 22156103 A US22156103 A US 22156103A US 2005223536 A1 US2005223536 A1 US 2005223536A1
- Authority
- US
- United States
- Prior art keywords
- gasket
- nozzle
- core
- components
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/20—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length
- B29C44/22—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length consisting of at least two parts of chemically or physically different materials, e.g. having different densities
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/06—Rod-shaped
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/304—Extrusion nozzles or dies specially adapted for bringing together components, e.g. melts within the die
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/021—Sealings between relatively-stationary surfaces with elastic packing
- F16J15/022—Sealings between relatively-stationary surfaces with elastic packing characterised by structure or material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/064—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces the packing combining the sealing function with other functions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
- F16J15/104—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by structure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
- F16J15/108—Special methods for making a non-metallic packing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/14—Sealings between relatively-stationary surfaces by means of granular or plastic material, or fluid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/05—Filamentary, e.g. strands
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2083/00—Use of polymers having silicon, with or without sulfur, nitrogen, oxygen, or carbon only, in the main chain, as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2083/00—Use of polymers having silicon, with or without sulfur, nitrogen, oxygen, or carbon only, in the main chain, as moulding material
- B29K2083/005—LSR, i.e. liquid silicone rubbers, or derivatives thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2301/00—Use of unspecified macromolecular compounds as reinforcement
- B29K2301/10—Thermosetting resins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0003—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular electrical or magnetic properties, e.g. piezoelectric
- B29K2995/0005—Conductive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/26—Sealing devices, e.g. packaging for pistons or pipe joints
- B29L2031/265—Packings, Gaskets
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/4998—Combined manufacture including applying or shaping of fluent material
- Y10T29/49982—Coating
Definitions
- the outer layer is also a one-component thermoplastic resin or a one-component, heat-cured extruded rubber.
- the outer component can also be made from a low-viscosity coating dispersion containing an elastomeric binder, a metallic material, a curing agent and a diluent, such as an organic solvent. The solvent is used to substantially reduce the viscosity of the coating, the inner core being in this case extruded and solidified prior to the application of the coating.
- FIG. 8 is a cross-sectional view of a mould used to form prefabricated gaskets of the invention.
- FIG. 10A to 10 D are end views of some different nozzle arrangements that can be utilized in performing the method of the invention.
- Silicon is an example of such a material.
- Sealing materials that have two initial components that chemically react with each other after they are combined and/or dispensed into a reaction-promoting atmosphere in order to form a gasket with a closed surface can also be used. The use of such material prevents moisture from penetrating the pores of the seal, and consequently, the interior of the casing.
- FIG. 7 is a cross-sectional view of a part 128 with a groove 126 to be gasketed, illustrating one way in which a co-dispensed gasket can be formed-in-place.
- the cover 130 can be applied after the gasket is formed.
- the surface of the groove and the composition used for the outer layer will determine whether the outer layer bonds to the surface.
- the co-dispensed gasket can also be applied on a flat surface rather than in a groove.
- the first insert 14 can be inserted in the seat in the nozzle head 10 or can be screwed into it in a detachable manner so that the inner nozzle 13 fitted into the first insert 14 can be interchangeable.
- a first shutoff valve 15 On the influx-side end of the first insert 14 and the inner nozzle 13 is inserted a first shutoff valve 15 .
- a feed for the material to the inner gasket core 2 is connected to an influx-side receptacle 16 of the first shutoff nozzle 15 .
- This feed can be formed in a known manner. If the material is a two-component material, the feed consists of a two-component mixing apparatus, in which the two components are mixed and fed through the shutoff valve 15 and the inner nozzle 13 .
- the components of the inner core and outer layer are passed through mixers 110 and 112 and shut-off valves 111 and 113 via tubes 142 , and are then dispensed through co-axial tubes 114 and 116 of nozzle 118 to form a co-dispensed gasket 120 , having a core 127 and an outer layer 124 .
- the resulting gasket will have an elastomeric or foam inner core 127 and an elastomeric or foam outer layer 124 .
- a second component in the form of a pressurised gas such as nitrogen may be added in the dispensing system to a molten thermoplastic first component.
- a pressurised gas such as nitrogen
- the nitrogen expands to foam the first component which rapidly sets to form a foam.
- the two layers of this gasket were co-dispensed at the same time.
- the inner core provides a very soft gasket with good compression recovery, low density and low cost, while the outer layer provides good UV and weather resistance and toughness to the gasket.
Abstract
A gasket (1) has a gasket core (2) and an outer gasket layer (4) covering the gasket core (2). At least one of the two sealing materials that make up the gasket has two reactive components before they are extruded, with said components chemically reatcting with one another as they are combined and/or extruded. The extruded core may be formed of a two-component resin which is at least one of an elastomer and a foam. The flexible outer layer may be a synthetic resin which is at least one of an elastomer and a foam. The outer layer may be electrically conductive, ultra-violet resistant, or resistant to the environment in which the gasket is to operate. Also taught are methods of apparatus for the manufacture of such gaskets
Description
- This invention relates to gaskets, their manufacture and apparatus for manufacturing same.
- There are many applications in which outer surface layers of a gasket and an inner core of the gasket require different and possibly mutually inconsistent properties, and thus proposals have been made for gaskets formed with an outer layer and an inner core of different materials.
- For example, the prior art describes the production of prefabricated gaskets for electromagnetic shielding consisting of an inner core and an outer layer. The inner core provides the gasket with physical properties such as compression deflection, tensile strength and elongation. The outer layer provides the surface with properties such as electrical conductivity. Both the inner core and the outer layer are elastomeric. The two layers can be co-dispensed (U.S. Pat. No. 4,968,854) or the inner core can be formed first with the outer layer applied afterwards (U.S. Pat. No. 5,141,770). The inner core usually consists of a one-component thermoplastic resin or a one-component, heat-cured extruded rubber. The outer layer is also a one-component thermoplastic resin or a one-component, heat-cured extruded rubber. The outer component can also be made from a low-viscosity coating dispersion containing an elastomeric binder, a metallic material, a curing agent and a diluent, such as an organic solvent. The solvent is used to substantially reduce the viscosity of the coating, the inner core being in this case extruded and solidified prior to the application of the coating.
- Gaskets may be used for electromagnetic shielding of electronic casings, and in the course of increasing miniaturization of casings, are placed in a free-flowing state from a nozzle directly onto a casing section to be sealed, where they harden. For the electromagnetic shielding of casings, the outer gasket layer usually consists of a sealing material that is a good conductor of electricity, while the inner layer, or an inner gasket core, is usually made of a sealing material that is a poor conductor of electricity or does not conduct electricity at all. Such a seal combines the good electrical properties of the outer layer with the good mechanical properties of the inner core, with the outer layer normally exhibiting worse mechanical properties, i.e., as regards compressibility, due to the addition of metal articles.
- Such a gasket is known, for example, from the unexamined European application EP 0 895 49 A2. This publication describes an electrically conductive seal that is produced through coextrusion of a silicon polymer and a silicon polymer with silver components to form a sealing material cord and a conductive medium cord enclosed by the sealing material cord. The outer, electrically conductive cord through the silver components serves to connect electrically conductive casing halves, in whose opening the seal is designed, in order to shield electromagnetic radiation from the casing interior or into the casing interior.
- The use of a silicon polymer involves some disadvantages. Silicon is not very compressible, thus, when reducing the size of the casing to be shielded with the consequent corresponding reduction in size of the gasket diameter, good compressibility of the sealing material is required in order to compensate for unevenness on the surfaces of the casing and to ensure that the gasket rests against all the surfaces to be sealed. Furthermore, silicon, which is applied in a viscous state, dries when exposed to air, and continues to harden in the process, is relatively difficult to process and comparatively expensive.
- The present invention provides a gasket which combines sealing materials with various mechanical, chemical, and/or electrical properties that can be produced in a simple manner, and which preferably have good compressibility.
- In an embodiment, at least one of the sealing materials has, before it is dispensed, at least two reactive components that react chemically with one another after they are combined and/or the components are dispensed. Polyurethane may be used as a sealing material, consisting of two components that react with one another after they are combined or after being dispensed into the air, and form a sealing foam. The result of the chemical reaction after the curing is a foam gasket that has good compressibility. The two components forming the polyurethane can be easily processed. Thus, these two components, which are suitable for the manufacture of the inner gasket core as well as the outer gasket layer, can be dispensed or processed in liquid state—and therefore a state that lends itself well to processing—onto the surface to be sealed, while forming a cord, where the two components react with one another and cure. Moreover, polyurethane is reasonably priced.
- An advantage of a sealing material that has at least two initial components to be used for at least one of the sealing layers is that the gasket assumes its desired characteristics and cures only after it is put in place through the reaction of at least two components, while the components that have already been mixed but have not yet reacted with one another can be easily worked with and can be dispensed or processed by means of a nozzle. The length of time that the components remain workable without reacting with one another depends on the material. In an embodiment, one can use initial components that react with each other only after they are dispensed into a reaction-promoting atmosphere in a mixed state.
- The invention thus provides a versatile co-dispensed gasket and a method for its manufacture, based on the use of a two-component core material setting to an elastomer or foam, to which is applied an outer layer which may be a further two-component material, setting to an elastomer or foam, or a solvent-based coating, either co-dispensed with the core material or applied to the latter subsequently. In this context, “two-component” as applied to the core material, should be construed broadly. The core material must be able to cure or set to a stable final material within the outer layer. This can be achieved with materials not traditionally considered to be two-component materials, as described further below. The core material should have a consistency such that it can be dispensed but will remain in situ after dispensing and during curing.
- This enables the core and/or the outer layer to be foams as well as elastomers. With a suitable choice of two component compositions or solvent-based coatings, the entire process can be carried out at ambient temperatures. The co-dispensing process can be used to provide form (and foam) in place gaskets, which is not practicable with any known process for two-component gaskets of the types concerned. Rather than forming the gasket in situ, it may be co-dispensed into a mould and then cured to provide a desired profile. If low density co-dispensed foams are used, the process is highly cost-effective, while the ability to use foams and/or elastomers with widely different properties makes it very versatile. The use of a mould also means that relatively low viscosity materials may be used, whereas in situ formation usually requires the materials to be highly viscous or thixotropic in order that they may remain in situ while curing or setting. The core and outer layers may be formed of different density foams, or the outer layer may be of a material selected to provide a thin, tough flexible skin.
- Accordingly, the invention provides a gasket comprising a core formed by a two-component resin which, when set, is at least one of an elastomer and a foam, over which is applied a flexible outer layer of a synthetic resin which, when set, is at least one of an elastomer and a foam.
- The invention also includes a method for the manufacture of a gasket according to the invention and an apparatus for the manufacture of a gasket according to the invention.
- The apparatus includes two coaxial nozzles, an inner nozzle for the material of the gasket core and an outer nozzle enclosing this inner nozzle for the material of the outer gasket layer. In an embodiment, these nozzles or at least one of these nozzles can be used interchangeably in the nozzle head, as a result of which the diameter and/or the sheathing thickness of the gasket can be varied in a simple manner.
- Further features of the invention will be apparent from the following description and examples of embodiments of the invention.
-
FIG. 1 is a cross-section of a gasket according to the invention, the gasket placed on a section of casing; -
FIG. 2 is a cross-section of a gasket according to the invention, with the gasket compressed in a closed casing; -
FIG. 3 is a cross-section of a gasket formed in a groove of a casing; -
FIG. 4 is a section of an apparatus for the manufacture of a gasket according to the invention; -
FIG. 5 is an enlarged section fromFIG. 4 ; -
FIG. 6 is a schematic diagram of an apparatus for producing gaskets of the invention; -
FIG. 7 is a fragmentary cross-sectional view of two machine parts, one with a groove to be gasketed with a foam-in-place co-dispensed gasket; -
FIG. 8 is a cross-sectional view of a mould used to form prefabricated gaskets of the invention; -
FIG. 9 is a fragmentary cross-sectional view showing an overlap of ends of an extrusion forming a co-dispensed gasket. -
FIG. 10A to 10D are end views of some different nozzle arrangements that can be utilized in performing the method of the invention. -
FIG. 1 shows a cross-section of agasket 1 according to the invention, with the gasket placed on asurface 5 of acasing part 6A. The gasket has aninner gasket core 2 and anouter gasket layer 4 that completely encloses theinner gasket core 2 in the embodiment shown. To manufacture thegasket 1, the first, free-flowing sealing material for thegasket core 2, and the second free-flowing sealing material for theouter gasket layer 4, are placed onsurface 5 where the sealing materials can cure. - At least one of the two sealing materials has, before being dispensed, at least two components that chemically react with one another after they are combined and/or dispensed into a reaction-promoting atmosphere. Air is a particular example of a reaction-promoting atmosphere, while polyurethane is an example of a sealing material that has at least two components. The components of polyurethane cure after the reaction, while forming a foam that has good compressibility and therefore adjusts well to the contours of the casing to be sealed.
- The
outer gasket layer 4, which can also consist of a sealing material that has at least two initial components, may be electrically conductive so that it can connect conductively two conductive halves of the casing, 6A, 6B in a closed casing as shown inFIG. 2 , and consequently so that it can electromagnetically shield the electronic components found in the casing. The material of theouter gasket layer 4 can also be chosen in such a way that it is UV- and/or acid-resistant or has this property in addition to the electric conductivity. Thegasket 1 is compressible so that it can fitclosed casing - The
outer gasket layer 4 may consist of a material that has a closed surface. Sealing foams, such as polyurethane, have pores that liquid can penetrate, and thus may allow the liquid to penetrate the casing to be sealed. In agasket core 2 having pores, theouter gasket layer 4 therefore may comprise a sealing material that has no pores, for example, silicon. For the outer gasket layer, a sealing material that has at least two initial components that react with one another after they are combined and/or are dispensed while forming anouter gasket layer 4 with a closed surface is also taught. -
FIG. 3 shows agasket 1 of the invention, which is formed in a groove 9 of acasing part 7. The groove 9 supports the positioning of the gasket core that is dispensed, with the core being still soft. The disadvantage in placing the sealing materials in a groove 9 is that there can be insufficient ventilation for drying the sealing in the groove 9. As a result, in some sealing materials used for theouter gasket layer 4, no integral skin impermeable to liquid forms on the surface of theouter gasket layer 4 in the area of the groove 9. The risk is that moisture gets through the seal in the area of the groove 9, and in this manner, the moisture penetrates the interior of the casing. To avoid these disadvantages, theouter gasket layer 4 may consist of material which forms an integral skin on the surface even when ventilation is bad during the curing. Such a sealing material can have at least two initial components that react with each other after they are combined or after they are dispensed. - The thickness of the
outer gasket layer 4 may be less than the diameter of thegasket core 2. In a seal for electromagnetic shielding of a casing, in which only theouter gasket layer 4 needs to be electrically conductive, one can save on resources such as silver as conductive material. - Of course, the
inner gasket core 2 as well as theouter gasket layer 4 can consist of a sealing material that has at least two components that chemically react with one another and cure after they are combined and/or dispensed into a reaction-promoting atmosphere. In the process, electrically conductive particles can be added to the components for theouter layer 4. - The final properties of the
gasket 1 will be exhibited only after the reaction of the initial components of therespective gasket layers - One embodiment of the invention provides for the sealing layer to completely enclose the gasket core and to have electrically conductive particles. This embodiment ensures that two conducting halves of the casing are always connected in an electrically conductive manner through the seal, independent of which part of the surface of the seal the casing halves lie against.
- A further embodiment provides that the outer gasket layer consists of a material that has a closed surface after the curing.
- Silicon is an example of such a material. Sealing materials that have two initial components that chemically react with each other after they are combined and/or dispensed into a reaction-promoting atmosphere in order to form a gasket with a closed surface can also be used. The use of such material prevents moisture from penetrating the pores of the seal, and consequently, the interior of the casing.
- Furthermore, it is possible to use for the outer gasket layer a material that exhibits a better resistance against various environmental influences, e.g., the outer gasket layer may have a material resistant to UV-light or acid, in order to adapt the seal to the respective conditions for use.
- Sealing materials may be extruded in a viscous state into the grooves of the casings in which they cure in order to form the seal. However, some materials may cure in the groove, particularly in the groove base, where there is poor ventilation, without forming a so-called integral skin on the scaling surface. The risk is that moisture will penetrate the gasket, and from there, the interior of the casing. The material forming the outer gasket layer is therefore preferably a sealing material that cures even in the grooves, i.e., even when ventilation is not good, while forming an integral skin on the surface. A sealing material that has at least two initial components comes into consideration as sealing material, in which the two components, after being combined or after being dispensed onto the surface to be sealed react with one another and cure, even when ventilation is not good, while forming an integral skin.
-
FIG. 7 is a cross-sectional view of apart 128 with agroove 126 to be gasketed, illustrating one way in which a co-dispensed gasket can be formed-in-place. Thecover 130 can be applied after the gasket is formed. The surface of the groove and the composition used for the outer layer will determine whether the outer layer bonds to the surface. The co-dispensed gasket can also be applied on a flat surface rather than in a groove. -
FIG. 8 is a cross-sectional view of a mould used to shape prefabricated gaskets in accordance with the invention. The gasket is dispensed into the bottom of themould 132. Thecover 134 is applied before the gasket sets. In this case, the outer layer and the mould surface are selected so that the cured gasket will release from the mould surface. -
FIG. 9 is a longitudinal cross-sectional view of a portion of a co-dispensed gasket in which the beginning and end of the extrusion overlap. This type of overlap is created by starting the dispensing of theouter layer material 136 before starting dispensing of thecore material 138, and continuing dispensing of the outer layer material after dispensing of the core material has been stopped. This may be conveniently achieved by usingvalves FIG. 6 . A continuous, closed-loop gasket is formed if the ends 140 and 142 of the dispensed material are overlapped. An open-ended gasket is formed without the overlap. Gaskets of many sizes and shapes can be made by mounting thenozzle 118 ofFIG. 6 on a programmable robot. -
FIGS. 10A to 10D are end views of some different nozzle configurations for co-dispensing gaskets in accordance with this invention. It will be noted that the nozzles are not necessarily concentric or of a similar profile, and that the nozzle for the outer layer material may not fully surround that for the core material, providing a gasket in which the core material is not fully enveloped by the outer layer. This may be necessary or desirable in some applications. - As shown in
FIGS. 10A and 10B , the relative thickness of the outer layer relative to the core layer may vary. It will normally be desirable that the outer layer and core are bonded securely together, and this will be facilitated if both the core and the outer layer are formed by resins of the same general type, e.g., polyurethane. - An apparatus whose nozzle head is shown in
FIG. 4 , and an enlarged partial section of which is inFIG. 5 , can be used to manufacture a gasket according to the invention. - The
nozzle head 10 has a first,continuous borehole 11 leading to asecond borehole 12 inclined at an angle against the axis of thefirst borehole 11. Aninner nozzle 13 is inserted into thefirst borehole 11, the nozzle having a diameter less than the inner diameter of thefirst borehole 11, so that a ring-shaped passage gap remains free between the exterior circumference of theinner nozzle 13 and interior circumference of thefirst borehole 11. Theinner nozzle 13 is pressed into afirst insert 14, which is inserted into the enlarged influx-side and (shown in the upper portion in the figure) of thefirst borehole 11. Thefirst insert 14 can be inserted in the seat in thenozzle head 10 or can be screwed into it in a detachable manner so that theinner nozzle 13 fitted into thefirst insert 14 can be interchangeable. On the influx-side end of thefirst insert 14 and theinner nozzle 13 is inserted afirst shutoff valve 15. A feed for the material to theinner gasket core 2 is connected to an influx-side receptacle 16 of thefirst shutoff nozzle 15. This feed can be formed in a known manner. If the material is a two-component material, the feed consists of a two-component mixing apparatus, in which the two components are mixed and fed through theshutoff valve 15 and theinner nozzle 13. - A second shutoff device, e.g., in the form of a
second shutoff valve 17, which can likewise be screwed into thenozzle head 10, is fastened to the influx-side end of thesecond borehole 12. Thesecond shutoff valve 17 also exhibits areceptacle 16, to which a feed is connected, through which the material of the outer feed is connected, through which the material of theouter gasket layer 4 is fed. Here as well, the feed can be a one-component dosing device or a two-component-mixture and dosing device, as already known in the art. Thefirst borehole 11 is enlarged in its outlet end, shown in the lower portion of the figure. In this enlarged end, asecond insert 18 can be inserted, into which anouter nozzle 19 is fit in. Thesecond insert 18 exhibits a continuous borehole into which theouter nozzle 19 has been inserted. The inner diameter of theouter nozzle 19 or the borehole of the second insert is larger than the outer diameter of theinner nozzle 13, as a result of which the ring slot between thefirst borehole 11 and theinner nozzle 13 in thesecond insert 18 and theouter nozzle 19 continues. Thesecond insert 18 may be inserted by means of an outside screw into an inner screw of the end-side enlargement of thefirst borehole 11 so that thesecond insert 18 can be interchanged with theouter nozzle 19. - For the manufacture of a gasket according to the invention, the first sealing material or initial components of the first sealing material are put in through the
first shutoff valve 15 and the second sealing material, or initial components of the second sealing material, through thesecond shutoff valve 17 of the nozzle head. At least one of the two sealing materials consists of at least two free-flowing components that chemically react with each other after they are combined and/or dispensed into a reaction-promoting atmosphere. The chemical reaction may be, for instance, a sealing foam that has good compressibility arising from the free-flowing components, a sealing material with closed surface, or a sealing material that also ventilates even when ventilation is not good, while forming an integral skin. Electrically conductive particles may be added in the process to the second sealing material or the components. - To extrude the sealing materials, the first sealing material is put under pressure by the
first shutoff valve 15 and theinner nozzle 13. Accordingly, the second scaling material, under pressure from thesecond shutoff valve 17 and thesecond borehole 12, is pressed into thefirst borehole 11 and theouter nozzle 19, which enclose the inner nozzle. - The first and second sealing materials are separated from one another in the
nozzles outer nozzles gasket core 2 is formed by the first sealing material. The core comes out of theinner nozzle 13 completely enclosed by anouter gasket layer 4 out of the second sealing material, formed by theouter nozzle 19 and the outer surface of theinner nozzle 13. The sealing materials are chosen such that they do not mix, or mix very little when they meet, but that they nevertheless adhere well to each other. - The
nozzle head 10 is fed through the casing part to be sealed so that a viscous gasket core merging from the nozzles is placed directly onto the casing part, and adheres and cures there in order to form the gasket. The sealing strand may be dispensed onto the casing under an atmosphere that promotes the chemical reaction of at least two components, which comprise at least one of the two sealing materials. - Through the
shutoff valves nozzle head 10 at the end of the dosing procedure so that no more component material enters the nozzles and boreholes of thenozzle head 10, preventing a drip of the sealing material at the end of the dosing procedure. - With the apparatus according to
FIG. 4 , a gasket for an electromagnetic shielding can be produced completely out of polyurethane, in which only the outer gasket layer is electrically conductive. For this, the two initial components of polyurethane are fed to the first hollow space and the two initial components made of polyurethane and an electrically conductive material are fed to the second hollow space. After the two sealing materials are dispensed, the components of the polyurethane react, forming a sealing foam in which the outer gasket layer is electrically conductive. - The diameter of the
inner gasket core 2 is largely determined by the diameter of theinner nozzle 13 and the thickness of theouter gasket layer 4 is largely determined by the difference between the outer diameter of theinner nozzle 13 and the inner diameter of theouter nozzle 19. By means of thefirst insert 14, theinner nozzle 13 can be changed in order to vary the diameter of theinner gasket core 2. By means of thesecond insert 18, theouter nozzle 19 can be changed in order to vary the outer diameter of theouter gasket layer 4, and consequently, the entire gasket. The thickness of theouter gasket layer 4 can likewise be varied by exchanging thenozzles -
FIG. 6 is a schematic of a dispensing apparatus for producing gaskets using a two-component resin system for the inner core and a two-component resin system for the outer layer. It comprisesreservoirs Reservoirs Reservoirs mixers valves tubes 142, and are then dispensed throughco-axial tubes nozzle 118 to form aco-dispensed gasket 120, having acore 127 and anouter layer 124. The resulting gasket will have an elastomeric or foaminner core 127 and an elastomeric or foamouter layer 124. - Although the following examples make use of conventional two-component thermosetting resin systems, the term two-component in the context of the invention should be taken to include systems in which the second component is a gas or simply moisture. A number of moisture-curing foamable compositions are known, and these may be used for the core material, as well as for the outer layer, provided that the moisture required for curing may reach the core. Thus the necessary moisture may be contained in the outer layer material or be produced as a by-product of its curing or may permeate through the outer layer, if the latter is an open cell foam, or the inner core may be moisture-cured by direct application of moisture, if the core is extruded using a nozzle which provides an extrusion in which the core is not fully enveloped by the outer layer. As a further alternative, a second component in the form of a pressurised gas such as nitrogen may be added in the dispensing system to a molten thermoplastic first component. On emerging from the extrusion nozzle, the nitrogen expands to foam the first component which rapidly sets to form a foam. The following examples however make use of conventional two-component core materials.
- A gasket of approximately a half-round cross-section, 8 mm in diameter, and having an outer layer 0.5 mm thick was formed by co-dispensing of two-component polyurethane foams as follows. An inner core was a two-component, thixotropic material available from Chemque Inc., Indianapolis, Ind., under the designation CHEM-CAST 624™, the mixing ratio of components A & B of that material being 100 parts to 18.5 part by weight. It cures to a flexible, polyurethane foam with the following properties when cured:
Shore OO Hardness: 45 Compression Deflection: 3.0 psi Foam Density: 0.3 gm/cm3 - The outer layer was an electrically-conductive thixotropic material available from Chemque Inc. under the designation CHEM-CAST 906™, the mixing ratio of components A & B of that material being 100 to 3.1 parts by weight. The material cures to a flexible polyurethane foam with the following properties:
Shore A Hardness: 10 Compression Deflection: 12.0 psi Foam Density: 0.6 gm/cm3 DC Volume Resistivity: 0.10 ohm · cm - The inner core constituted approximately 76% of the total volume. The outer layer constituted approximately 24% of the total volume. The inner core contributed to forming a very soft gasket with good compression recovery, low density and low cost. The outer layer contributed to providing a high electrical conductivity of the finished gasket. The effects of high cost, high hardness and poor compression recovery of the outer layer are minimized by co-dispensing. The overall result was a soft flexible resilient gasket with good conductivity at reasonable cost.
- A gasket was formed of similar dimensions to that of
FIG. 6 , except that the outer layer had a thickness of 0.25 mm. In this case, the inner core was formed from CHEM-CAST 624™ mixed as described in Example I to provide a flexible, MDI-based polyurethane foam. This foam has poor UV resistance and outdoor weathering properties: - The outer layer was a white-pigmented, two-component low-viscosity material, available as CHEM-DEC ER96071™ from Chemque Inc., with parts A & B mixed in the ratio of 100 to 110 parts by weight. This cures to a flexible polyurethane elastomer incorporating an aliphatic isocyanate for good UV resistance, and having a Shore A hardness of 50.
- The two layers of this gasket were co-dispensed at the same time. The inner core provides a very soft gasket with good compression recovery, low density and low cost, while the outer layer provides good UV and weather resistance and toughness to the gasket.
- A gasket was formed by co-dispensing, having similar dimensions to those of Example 2. The core layer was a two-component thixotropic material available from Chemque Inc. under the designation CHEM-CAST 628-231™, with components A & B mixed in the ratio of 87 to 100 by weight. It cures to a flexible, silicone foam with the following properties:
Shore A Hardness: 15 Compression Deflection: 4.0 psi Foam Density: 0.45 gm/cm3 - The outer layer was a two-component, electrically conductive, thixotropic material available from Chemque Inc. under the designation CHEM-CAST ER 96088-3™ with components A & B mixed in the ratio 100 to 4.6 by weight. It cures to an electrically-conductive flexible silicone elastomer. It was found that the addition of solvent reduced viscosity for ease of application. As an alternative to co-dispensing, the outer layer may be applied after curing of the inner core layer.
Shore A Hardness: 70 Elastomer Density: 2.9 gm/cm3 DC Volume Resistivity: 0.15 ohm · cm - The elastomer of the outer skin adds electrical conductivity and toughness to the soft resilient inner foam core.
Claims (14)
1-44. (canceled)
45. An apparatus for the manufacture of a seal comprising:
a nozzle head having a feeding side and an outgoing side; an inner nozzle arranged within the nozzle head for feeding a first sealing material; an outer nozzle arranged within the nozzle head for feeding a second sealing material, wherein the outer nozzle at least partially, coaxially encloses the inner nozzle.
46. The apparatus according to claim 45 wherein the nozzle head further comprises a first borehole, wherein the inner nozzle is coaxially inserted into the first borehole, wherein the inner diameter of the first borehole is larger than the outer diameter of the inner nozzle, and the outer nozzle is inserted into the first borehole.
47. The apparatus according to claim 46 further comprising a second borehole connected to the side of the first borehole.
48. The apparatus according to claim 45 further comprising a detachable first insert connected to the inner nozzle, wherein the inner nozzle and the detachable first insert can be detachably inserted from the feeding side of the nozzle head into the first borehole.
49. An apparatus according to claim 48 wherein the inner nozzle is interchangeable.
50. An apparatus according to claim 45 further comprising a detachable second insert connected to the outer nozzle, wherein the outer nozzle and the detachable second insert can be detachably inserted from the outgoing side of the nozzle head into the first borehole.
51. An apparatus according to claim 50 wherein the outer nozzle is interchangeable.
52. An apparatus according to claim 45 further comprising a first feeding passage connected to the inner nozzle to supply the first sealing material to the inner nozzle and a second feeding passage connected to the outer nozzle to supply the second sealing material to the outer nozzle.
53. An apparatus according to claim 52 further comprising a shutoff device inserted into the first feeding passage, into the second feeding passage, or both.
54. An apparatus according to claim 52 further comprising two reservoirs connected to the first feeding passage, wherein the two reservoirs hold components of the first sealing material.
55. An apparatus according to claim 52 further comprising two other reservoirs connected to the second feeding passage, wherein the two other reservoirs hold components of the second sealing material.
56. An apparatus according to claim 54 further comprising a first mixer connected between the first passage and the two reservoirs, wherein the components of the first material are mixed in the first mixer.
57. An apparatus according to claim 55 further comprising a second mixer connected between the second passage and the two other reservoirs, wherein the components of the second material are mixed in the second mixer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/221,561 US20050223536A1 (en) | 2000-03-24 | 2001-03-26 | Gasket, method of manufacturing and apparatus for manufacturing same |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US53447300A | 2000-03-24 | 2000-03-24 | |
DE10039068A DE10039068B4 (en) | 2000-08-10 | 2000-08-10 | Seal, method and apparatus for making a gasket |
DE10039068.4 | 2000-08-10 | ||
PCT/CA2001/000399 WO2001071223A2 (en) | 2000-03-24 | 2001-03-26 | Gasket, method of manufacturing and apparatus for manufacturing same |
US10/221,561 US20050223536A1 (en) | 2000-03-24 | 2001-03-26 | Gasket, method of manufacturing and apparatus for manufacturing same |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US53447300A Continuation-In-Part | 2000-03-24 | 2000-03-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20050223536A1 true US20050223536A1 (en) | 2005-10-13 |
Family
ID=26006656
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/221,561 Abandoned US20050223536A1 (en) | 2000-03-24 | 2001-03-26 | Gasket, method of manufacturing and apparatus for manufacturing same |
Country Status (3)
Country | Link |
---|---|
US (1) | US20050223536A1 (en) |
AU (1) | AU2001244003A1 (en) |
WO (1) | WO2001071223A2 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080053645A1 (en) * | 2006-08-31 | 2008-03-06 | Denso Corporation | Heat exchanger and manufacture method for the same |
WO2013109180A3 (en) * | 2012-01-19 | 2013-10-24 | Nolato Silikonteknik Ab | Device and method for producing an element for electromagnetic shielding |
US20210071490A1 (en) * | 2018-09-17 | 2021-03-11 | Halliburton Energy Services, Inc. | Two part bonded seal for static downhole tool applications |
US20220003267A1 (en) * | 2018-11-19 | 2022-01-06 | Zf Friedrichshafen Ag | Seal device, electric machine, and drive device |
WO2022013532A1 (en) * | 2020-07-16 | 2022-01-20 | Matcon Ltd | Seal |
US20220170547A1 (en) * | 2019-03-29 | 2022-06-02 | Abb Schweiz Ag | Joint, Motor, Industrial Robot And Method Of Installing A Seal |
US20220275866A1 (en) * | 2019-03-29 | 2022-09-01 | Nidec Corporation | Liquid agent application method, liquid agent application machine, and liquid gasket |
US11674596B2 (en) * | 2021-11-01 | 2023-06-13 | Kennedy Valve Company | Seal with first elastomeric element and second elastomeric element |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2192717C2 (en) | 1997-03-05 | 2002-11-10 | Бернд ТИБУРТИУС | Shielding casing manufacturing process |
US6787221B2 (en) * | 2000-03-24 | 2004-09-07 | Chemque Incorporated | Co-dispensed compositions for gaskets and other objects |
US6723916B2 (en) | 2002-03-15 | 2004-04-20 | Parker-Hannifin Corporation | Combination EMI shielding and environmental seal gasket construction |
DE202005001316U1 (en) * | 2005-01-26 | 2005-03-31 | Mann & Hummel Gmbh | Collecting trough for a machine tool |
DE102007042487B4 (en) * | 2007-09-06 | 2010-08-19 | Weber Gmbh & Co. Kg Kunststofftechnik Und Formenbau | Method for producing a gasket, gasket and its use |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3833247A (en) * | 1973-03-15 | 1974-09-03 | Royle & Sons J | Breech-lock mechanism for extrusion apparatus |
US4125225A (en) * | 1971-03-01 | 1978-11-14 | The Perkin-Elmer Corporation | Corrosion-free nebulizer |
US4568003A (en) * | 1981-09-02 | 1986-02-04 | Sealed Air Corporation | Detachable mixing chamber for a fluid dispensing apparatus |
US4931479A (en) * | 1988-11-07 | 1990-06-05 | Chomerics, Inc. | Foam in place conductive polyurethane foam |
US4968854A (en) * | 1988-11-10 | 1990-11-06 | Vanguard Products Corporation | Dual elastomer gasket shield for electronic equipment |
US5730446A (en) * | 1995-06-20 | 1998-03-24 | Minnesota Mining And Manufacturing Company | Sealing strip suitable for sealing a hem flange |
US5752663A (en) * | 1996-01-26 | 1998-05-19 | Hewlett-Packard Company | Micro concentric tube nebulizer for coupling liquid devices to chemical analysis devices |
US5884846A (en) * | 1996-09-19 | 1999-03-23 | Tan; Hsiaoming Sherman | Pneumatic concentric nebulizer with adjustable and capillaries |
US5950875A (en) * | 1995-11-30 | 1999-09-14 | Sealed Air Corporation | Modular foam dispenser |
US6511850B1 (en) * | 1999-07-13 | 2003-01-28 | The Texas A&M University System | Pneumatic nebulizing interface to convert an analyte-containing fluid stream into an aerosol, method for using same and instruments including same |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1222656B (en) * | 1960-09-29 | 1966-08-11 | Delore Sa Geoffroy | Extrusion process and multicolor extrusion press for applying a cover to an extruded body |
DE2352538A1 (en) * | 1973-10-19 | 1975-04-30 | Huels Chemische Werke Ag | METHOD FOR MANUFACTURING STRANDED PLASTIC PROFILES AND DEVICE FOR CARRYING OUT THIS METHOD |
JPS60132171A (en) * | 1983-12-19 | 1985-07-15 | Nissan Motor Co Ltd | Application method of liquid gasket |
US5141770A (en) | 1988-11-10 | 1992-08-25 | Vanguard Products Corporation | Method of making dual elastomer gasket shield for electromagnetic shielding |
DE19541478C2 (en) * | 1995-11-07 | 2003-10-16 | Reinz Dichtungs Gmbh | Sealing cord with lip profile seal |
DE19733627C1 (en) | 1997-07-29 | 1998-06-18 | Neuhaus Elektronik Gmbh | Seal extruded by xyz robot for electromagnetic screening and physical sealing of electronics cabinets |
-
2001
- 2001-03-26 WO PCT/CA2001/000399 patent/WO2001071223A2/en active Application Filing
- 2001-03-26 US US10/221,561 patent/US20050223536A1/en not_active Abandoned
- 2001-03-26 AU AU2001244003A patent/AU2001244003A1/en not_active Abandoned
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4125225A (en) * | 1971-03-01 | 1978-11-14 | The Perkin-Elmer Corporation | Corrosion-free nebulizer |
US3833247A (en) * | 1973-03-15 | 1974-09-03 | Royle & Sons J | Breech-lock mechanism for extrusion apparatus |
US4568003A (en) * | 1981-09-02 | 1986-02-04 | Sealed Air Corporation | Detachable mixing chamber for a fluid dispensing apparatus |
US4931479A (en) * | 1988-11-07 | 1990-06-05 | Chomerics, Inc. | Foam in place conductive polyurethane foam |
US4931479B1 (en) * | 1988-11-07 | 2000-10-10 | Parker Intangibles Inc | Foam in place conductive polyurethane foam |
US4968854A (en) * | 1988-11-10 | 1990-11-06 | Vanguard Products Corporation | Dual elastomer gasket shield for electronic equipment |
US5730446A (en) * | 1995-06-20 | 1998-03-24 | Minnesota Mining And Manufacturing Company | Sealing strip suitable for sealing a hem flange |
US5950875A (en) * | 1995-11-30 | 1999-09-14 | Sealed Air Corporation | Modular foam dispenser |
US5752663A (en) * | 1996-01-26 | 1998-05-19 | Hewlett-Packard Company | Micro concentric tube nebulizer for coupling liquid devices to chemical analysis devices |
US5884846A (en) * | 1996-09-19 | 1999-03-23 | Tan; Hsiaoming Sherman | Pneumatic concentric nebulizer with adjustable and capillaries |
US6511850B1 (en) * | 1999-07-13 | 2003-01-28 | The Texas A&M University System | Pneumatic nebulizing interface to convert an analyte-containing fluid stream into an aerosol, method for using same and instruments including same |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080053645A1 (en) * | 2006-08-31 | 2008-03-06 | Denso Corporation | Heat exchanger and manufacture method for the same |
WO2013109180A3 (en) * | 2012-01-19 | 2013-10-24 | Nolato Silikonteknik Ab | Device and method for producing an element for electromagnetic shielding |
US20210071490A1 (en) * | 2018-09-17 | 2021-03-11 | Halliburton Energy Services, Inc. | Two part bonded seal for static downhole tool applications |
US11598168B2 (en) * | 2018-09-17 | 2023-03-07 | Halliburton Energy Services, Inc. | Two part bonded seal for static downhole tool applications |
US20220003267A1 (en) * | 2018-11-19 | 2022-01-06 | Zf Friedrichshafen Ag | Seal device, electric machine, and drive device |
US11971103B2 (en) * | 2018-11-19 | 2024-04-30 | Zf Friedrichshafen Ag | Seal device, electric machine, and drive device |
US20220170547A1 (en) * | 2019-03-29 | 2022-06-02 | Abb Schweiz Ag | Joint, Motor, Industrial Robot And Method Of Installing A Seal |
US20220275866A1 (en) * | 2019-03-29 | 2022-09-01 | Nidec Corporation | Liquid agent application method, liquid agent application machine, and liquid gasket |
US11773979B2 (en) * | 2019-03-29 | 2023-10-03 | Nidec Corporation | Liquid agent application method, liquid agent application machine, and liquid gasket |
WO2022013532A1 (en) * | 2020-07-16 | 2022-01-20 | Matcon Ltd | Seal |
US11674596B2 (en) * | 2021-11-01 | 2023-06-13 | Kennedy Valve Company | Seal with first elastomeric element and second elastomeric element |
Also Published As
Publication number | Publication date |
---|---|
WO2001071223A2 (en) | 2001-09-27 |
AU2001244003A1 (en) | 2001-10-03 |
WO2001071223A3 (en) | 2002-05-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20050223536A1 (en) | Gasket, method of manufacturing and apparatus for manufacturing same | |
US6787221B2 (en) | Co-dispensed compositions for gaskets and other objects | |
US5641438A (en) | Method for forming an EMI shielding gasket | |
US5439711A (en) | Method for co-reactive extrusion coating of pipe using thermosetting material | |
EP1382045B1 (en) | Polymeric foam gaskets and seals | |
US7229516B2 (en) | Foam bodied gasket and gasket tape and method of making and using the same | |
US20030047885A1 (en) | Gasket and gasket tape and method of making and using the same | |
US20190162306A9 (en) | Polyurea gasket and gasket tape and a method of making and using the same | |
EP0368612A1 (en) | Use of conductive polyurethane foams | |
GB2049718A (en) | Gaskets for electric shielding | |
JP3022859B1 (en) | Conductive roll and manufacturing method thereof | |
EP1041869B1 (en) | Form-in-place EMI gaskets | |
DE19851166A1 (en) | A foamable electricity and heat conducting sealant and adhesive useful for sealing and adhesive bonding of electronic equipment and mobile phone housings has higher electrical conductivity than a non-in situ foam | |
US4552913A (en) | One component polyurethane SMC surface coat | |
WO2011042005A2 (en) | Cable lead-through in plug-in connector housings | |
EP2484718B1 (en) | Rubber-based resin closed-cell foam sheet and manufacturing method therefor | |
CN103260842A (en) | Sealing shell and use thereof, device and method for producing foam-molded parts | |
EP0047081B1 (en) | Telecommunication cable filled with foamed polyurethane composition | |
DE10039068B4 (en) | Seal, method and apparatus for making a gasket | |
JP2000235814A (en) | Foaming resin composition for manufacturing highly foamed polyethylene covered wire with inert gas foaming method, and highly foamed insulating polyethylene covered wire using the same | |
US20060125135A1 (en) | Method for manufacturing resing films | |
EP1570495B1 (en) | Electrical cable with foamed semiconductive insulation shield | |
DE2459136A1 (en) | Electric cable fittings prodn. - by expanding and solidifying resin mass in mould placed around cable ends | |
KR102656556B1 (en) | Portable Two-Component Polyurethane Foam Injection Device | |
JPH04229567A (en) | Plug-in insulating tube |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: HUGO KERN UND LIEBERS GMBH & CO., STATELESS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SCHUBERT, ELVIRA;HAMPEL, STEFAN;REEL/FRAME:013799/0437 Effective date: 20020905 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |