JP2007068331A - Static electricity holding device, transfer method using device, application method of coating film, and molding mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an application method of a coating film that can transfer the coating film to even an object to be coated having a stereoscopic shape having a concave and a convex, and a bent part. <P>SOLUTION: There is used a static electricity holding device 500 having a stereoscopic static electricity holding surface 501 conforming to the stereoscopic one-surface shape 102a of the object 102 to be handled. This transfer method includes a coating film transfer step that a stereoscopic coating film forming film 102 stereoscopically formed by conforming to the shape of the stereoscopic one surface 1a of the object 1 to the surface of the object 1 by making the static electricity holding surface 501 of the static electricity holding device 500 hold the stereoscopic coating film forming film 102, and a coating film curing step that makes the stereoscopic coating film forming film 102 tightly adhere to the object 1 by applying physical and/or chemical actions to the stereoscopic coating film forming film 102 while the stereoscopic coating film forming film 102 is transferred to the surface 1a of the object 1. The method can be used for the coating of a home electric appliance, a vehicle or the like. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electrostatic holding device having a three-dimensional electrostatic holding surface that matches a three-dimensional surface shape of an object to be handled, and a transfer method, a coating film applying method, and a molding die using the same. . In addition, the present invention is particularly an electrostatic holding device capable of holding a thin film molded body in a state in which the three-dimensional shape of the thin film molded body shaped into a three-dimensional shape is maintained to the extent that it is difficult to maintain the form alone, and The present invention relates to a transfer method using the same, a coating film applying method, and a mold.

  Conventionally, as a method for applying a thin film to the surface of an object to be coated, there are various methods such as electrostatic coating, powder coating, etc. in addition to a method of forming a coating film on an object by roller coating, brush coating, spray coating, etc. A method for forming a coating film is known. In addition, a film to be a coating film is formed in advance, the coating film is adhered to the surface of the object to be coated, and the coating film is transferred to the surface of the object by adhesion. Yes.

  In coating with a liquid such as paint, when the viscosity of the paint is low, there is a limit to the thickness of the coating film in a single coating. For example, to form a thick coating film exceeding about 10 to 25 μm Requires overcoating. In the overcoating, it is preferable to apply the topcoat after the coating film serving as a base is dried. In this case, there is a problem that a coating film applying step is required for a long time. On the other hand, if the viscosity of the paint is increased, thick coating is possible, but it is unavoidable to deteriorate the quality of the finished surface.

  On the other hand, according to the transfer method in which a solid material such as a coating film is transferred to the surface of an object to be coated, a thick film can be provided by a single transfer. However, the conventional transfer method is limited to a case where the object to be coated is a flat surface, and is not transferred onto a three-dimensional surface.

  Even when the object to be coated is three-dimensional, if the coating film by the transfer method can be applied to the object to be coated, a dramatic improvement in the coating film applying process is expected.

  Accordingly, an object of the present invention is to provide a method for applying a coating film that can be transferred to an object to be coated having a three-dimensional shape having irregularities and curved portions.

  In order to solve the above problems, the present inventors have conducted intensive research.As a result, a three-dimensional film-forming film is formed using a mold having a shape along the three-dimensional surface of the object to be coated, and the shape is maintained. If it was transferred to the object to be coated and the film for forming a coating film was cured, it was thought that transfer could be performed even if the object to be coated had a three-dimensional surface.

  Also, at this time, the electrostatic holding surface of the electrostatic chuck was made into a three-dimensional surface that matched the shape of the surface to be coated, so that it was shaped into a three-dimensional shape to the extent that it was difficult to maintain the form alone. Even if it was a film for coating-film formation, it thought that it could hold | maintain, maintaining the form of the film for coating-film formation in the state which maintained the three-dimensional shape.

  Further, if an electrostatic holding surface that matches the shape of the surface to be coated is provided on the molding surface of the mold, the molded body is held as it is on the molding surface having electrostatic holding performance, I thought that it could be transferred to.

  Furthermore, such an electrostatic holding device and a mold are not limited to those in which it is difficult for the handling object (or film for forming a coating film) to maintain a three-dimensional shape, but a handling object having a shape maintaining property ( Or a film for forming a coating film).

  That is, the first invention is an electrostatic holding device including a three-dimensional electrostatic holding surface that matches the three-dimensional surface shape of the handling object.

  Here, the three-dimensional electrostatic holding surface that matches the one-dimensional surface shape of the handling object is substantially the same shape as the one-surface shape of the handling object, or is fitted or fitted to the one surface. It means a shape that collides.

  According to a second aspect of the present invention, a three-dimensional film molded body formed with a three-dimensional surface shape is held on the electrostatic holding surface of the electrostatic holding device according to claim 1 that matches the one surface shape. This is a transfer method.

  According to a third aspect of the present invention, there is provided a film for forming a three-dimensional coating film that is three-dimensionally formed so as to match the three-dimensional surface shape of an object to be coated on the electrostatic holding surface of the electrostatic holding apparatus according to claim 1. A coating film transfer step for holding and transferring the film to the surface of the object to be coated, and a physical and / or three-dimensional film forming film in a state where the film for forming the three-dimensional film is transferred to the surface of the object And a coating film curing step in which the three-dimensional coating film forming film is fixed to an object by chemical action.

  Here, the electrostatic holding surface is preferably transparent to radiation including at least one of ultraviolet rays, light rays, and electron beams. With such an electrostatic holding surface, the coating film forming film is cured by irradiation with radiation in a state where the coating film forming film is held on the surface of the object to be coated by the electrostatic holding surface. A high-quality coating film can be imparted to the surface of the object to be coated by including a material that cures while exhibiting adhesiveness by irradiation of radiation in the coating film-forming film to be imparted.

  Moreover, 4th invention is a shaping | molding die provided with the three-dimensional electrostatic holding surface which matched the one-dimensional surface shape of the to-be-coated object.

  ADVANTAGE OF THE INVENTION According to this invention, the provision method of the coating film which can be transferred also to the to-be-coated object which has a three-dimensional shape provided with the unevenness | corrugation and a curved part can be provided.

  The electrostatic holding device according to the first invention will be described below with reference to the drawings.

  First, prior to the description of the present invention, a general electrostatic holding device 100 shown in FIG. 11 will be described.

  In FIG. 11, reference numeral 504 denotes a base member to which an electrode (electrostatic electrode) is attached. A pair of electrode elements 502 a and 502 b are covered with an insulating material 503 and fixed to the base member 504. The electrode elements 502a and 502b are connected to a voltage control unit 505. Under the control of the voltage control unit 505, each electrode element 502a has a predetermined voltage of −V (volt) and the electrode element 502b has a predetermined voltage of + V (volt). Or each electrode element 502a, 502b is configured to be grounded.

  Next, the operation of the electrostatic holding device configured as described above will be described. A predetermined voltage is applied from the voltage controller 505 to the electrode elements 502a and 502b. As a result, an electrostatic force is induced on the electrostatic holding surface 501 and the handling object 102 is attracted and held on the electrostatic holding surface 501 by the electrostatic attraction force.

  By blocking the voltage application to the electrode elements 502a and 502b and grounding the electrode elements 502a and 502b, the electrostatic holding surface 501 loses electrostatic force, and the holding of the handling object 102 is released.

  In addition, by appropriately controlling the voltage application of the voltage control unit 505, the handling object 102 can be held in a floating state by balancing the electrostatic attraction force and the falling of the handling object due to gravity. it can.

  Such electrostatic chucks are disclosed in, for example, Japanese Patent Application Laid-Open No. 2004-120921, Japanese Patent Application Laid-Open No. 7-257751, Japanese Patent Application Laid-Open No. 9-322564, Japanese Patent Application Laid-Open No. 10-66367, Japanese Patent Application Laid-Open No. 2001-9766, and the like. Are described in detail.

  Here, the conventional electrostatic holding surface 501 is generally formed on a flat surface as shown in FIG. 11 since the object to be handled 102 is a flat plate material such as a thin plate or a film. Thereby, even if it hold | maintains a thin plate etc. as a object, a thin plate can be hold | maintained with the electrostatic force of the whole electrode surface, without bending including a peripheral part compared with a vacuum chuck.

  Therefore, in the electrostatic holding device 500 according to one embodiment of the present invention, the shape of the electrostatic holding surface 501 is substantially fitted to the three-dimensional shape of the outer surface 102a of the handling object 102 as shown in FIG. And The electrostatic holding device 500 operates on the same principle as the electrostatic holding device 100 shown in FIG. 11, and electrode elements 502 a and 502 b are covered with an insulating material 503 and fixed to a base member 504 (not shown). A constant voltage is applied to and cut off from the voltage control unit 505 to these electrode elements 502a and 502b.

  Here, the essential object of the first invention is to hold the handling object 102 while maintaining the form of the three-dimensionally shaped handling object 102 (for example, a film for forming a coating film). Therefore, for example, even when the electrostatic holding surface 501 is divided into a plurality of sections and adjacent sections are separated from each other, the form of the handling object 102 is formed in a state where the electrostatic holding surfaces 501 are gathered. What is necessary is just to be able to hold | maintain, maintaining. The degree of separation varies depending on the state of the handling object 102.

  Next, the invention of the transfer method according to the second invention will be described while explaining the operation of the electrostatic holding apparatus 500 configured as described above.

  The electrostatic holding surface 501 is moved to the vicinity of the handling object 102 and the voltage control unit 505 is operated to apply a voltage to each of the electrode elements 502a and 502b. As a result, the electrostatic attraction force acts on the static electricity holding surface 501 and the handling object 102 is attracted to the electrostatic holding surface 501. Since this adsorption is a surface adsorption, even if the handling object 102 has unstable shape retention, or the handling object 102 does not have a self-supporting property, the electrostatic holding surface 501 Since it acts as a support and assists in maintaining the shape of the handling object 102, the handling object 102 is reliably attached to the electrostatic holding surface 501 even if the electrostatic holding device 500 or the electrostatic holding surface 501 is moved. Can be held and moved.

  Next, the voltage control unit 505 is operated to cut off the voltage supply to the electrode elements 502 a and 502 b and ground the electrode elements 502 a and 502 b, thereby eliminating the electrostatic force and releasing the handling object 102. it can.

  Thereby, if this electrostatic holding device is used, the self-supporting property is lacking, that is, even if it is a three-dimensional thin film molded body that is difficult to handle by maintaining the form alone, while maintaining the form, It is possible to transfer the thin film molded body without generating stress (stress).

  Next, the invention relating to the coating film applying method according to the third invention will be described with reference to the drawings.

  The method for applying a coating film comprises a three-dimensional coating film forming film three-dimensionally formed so as to conform to the three-dimensional surface shape of an object to be coated. The electrostatic holding surface of the electrostatic holding apparatus according to the first invention The coating film transfer step S1 which is held at 501 and transferred to the surface of the coating object, and the three-dimensional coating film forming film is physically transferred with the three-dimensional coating film forming film transferred to the surface of the coating object. And / or a coating film curing step S2 that is chemically fixed to adhere to the object to be coated.

  Here, the three-dimensional film to be applied to the coating film transfer step S1 is a three-dimensional film forming film that is three-dimensionally formed so as to match the three-dimensional surface shape of the object to be coated. The method is not limited.

  As shown in FIG. 2, a mold 10 having an outer shape exactly the same as the outer shape of an object to be coated having a hemispherical protrusion is prepared. The surface 10a of the mold 10 is made of a peelable material. A coating film 102 is applied to the peelable surface 10a of the mold 10 by a conventional method (FIG. 3). The coating film 102 may be essentially the same as, for example, a coating layer formed on a known release paper.

  In the simplest configuration, a coating film of a curable polymer such as a thermoplastic polymer, a thermosetting resin, a photocrosslinkable polymer, or an electron beam curable polymer is formed on the surface 10a. Appropriate methods such as spray coating, brush coating, and roller coating are employed for applying the coating film. Moreover, these coating films may be a single layer or multiple layers, and may contain various additives such as pigments, dyes, colorants, stabilizers, fillers, and the like as necessary.

  As an example, the object to be coated 1 is a vehicle, and the coating film for a vehicle is formed on the outer plate of the vehicle body as the object to be coated 1, as shown in FIG. In the case of the four-layer structure of the clear coating film 4 and the second clear coating film 5, the undercoat coating film 2, the base layer 3, the first clear coating film 4, and the second clear coating film 5 A coating film 102 having a four-layer structure is applied. Of course, these layers 2 to 5 may be sequentially applied separately, or the layers 1 and 2 and the layers 3 and 4 may be separately applied.

  The coating film 102 thus obtained is supported by the mold 10 as a support to maintain a three-dimensional shape, and it is difficult to maintain the form in a state where it is peeled off from the releasable surface 10a. For example, if only the both ends of the coating film 102 are held, the coating film 102 may be damaged by the stress applied to the coating film 102.

  Therefore, as shown in FIG. 5, an electrostatic holding device 500 is prepared in which the shape of the electrostatic holding surface 501 is fitted to the surface 10 a (or the outer shape of the object to be coated). The electrostatic holding device 500 operates on the same principle as the electrostatic holding device 100 shown in FIG. 11, and electrode elements 502 a and 502 b are covered with an insulating material 503 and fixed to a base member 504 (not shown). A constant voltage is applied to and cut off from the voltage control unit 505 to these electrode elements 502a and 502b.

  Using this electrostatic holding device 500, the electrostatic holding surface 501 is lightly brought into contact with the outer surface 102a of the coating film 102 formed on the surface 10a while aligning as necessary, and a voltage control unit (not shown) A voltage is applied by this to cause the coating film 102 as a handling object to be adsorbed to the electrostatic holding surface 501 by electrostatic force. Next, the mold 10 and the coating film 102 are peeled off, and the coating film 102 is held by the electrostatic holding surface 501 as indicated by a two-dot chain line. The coating film 102 is held by the electrostatic holding surface 501 even when it is separated from the mold 10 as the support. Since this holding is surface adsorption (surface holding), the form of the coating film 102 is stably maintained, and no stress is applied to the coating film 102, so that the coating film 102 is not damaged.

  The electrostatic holding device 500 is moved to a predetermined position and / or the mold 10 is moved, and the surface 1a of the article 1 is changed to the mold 10 as shown in FIG. The inner surface 102b is brought close to and roughly fitted.

  The coating film 102 is transferred to the surface of the workpiece 1 by cutting off the voltage to the electrode elements 502 a and 502 b and grounding the electrodes. If the electrostatic holding device 500 and the object to be coated 1 are separated, the surface of the object to be coated 1 (coating film 102) is heated, or the coating film 102 is cured by emitting ultraviolet rays, electron beams, etc. The coating is immediately cured and fixed to the surface of the article 1 to be coated.

  As a modification, when the electrostatic holding device 500 including the electrostatic holding surface 501 is light transmissive, the coating film 102 is electrostatically held on the surface 1a of the article 1 as shown in FIG. The coating film 102 can be radiation-cured by irradiating with radiation ν such as light, ultraviolet rays, and electron beams in a state where the electrostatic holding surface 501 of the apparatus 500 is pressed.

  Similarly, if the coating film 102 can be heated from the electrostatic holding surface 501 by heat transfer, the coating film 102 can be thermally cured to fix the coating film 102 to the article 1 to be coated.

Further, if a resin that exhibits an adhesive force by pressure is used, the coating film 102 can be fixed to the article 1 by applying pressure to the coating film from the electrostatic holding surface 501.
(Modification)
Instead of the mold 10 shown in FIG. 2, a mold 10A as shown in FIG. 8 may be used. Here, the molding die 10A has a molding surface 10Aa having a shape that fits the surface 1a of the article 1 to be coated. If such a mold 10A is used, for example, a coating film 102 '(not shown) in which the front and back of the laminated structure of the layers 2 to 5 in FIG. 4 are reversed can be obtained.

  Therefore, an electrostatic holding device 500 ′ (not shown) having an electrostatic holding surface 501 ′ (not shown) configured to be fitted to the coated film 102 ′ (not shown) whose front and back are reversed, and the electrostatic holding surface The electrostatic holding surface 501 is provided by using a pair of electrostatic holding devices with the electrostatic holding device 500 having the electrostatic holding surface 501 fitted to 501 ′ and transferring between the electrostatic holding devices. If the upper and lower surfaces of the coating film are reversed while holding the electrostatic holding surface 501 ′, the same coating film 102 as in the embodiment can be applied.

  Next, the invention of a mold having a fourth electrostatic holding surface will be described with reference to the drawings.

  The mold 20 is a split mold composed of an upper mold 21 and a lower mold 22 as shown in FIG. The shape of the surface 21 a of the upper mold 21 is a shape that fits with the surface 1 a of the article 1 to be coated. An electrostatic holding surface 501 of the electrostatic holding device 500 is provided on the surface 21a. The electrostatic holding surface 501 has a substantially uniform thickness, whereby the shape of the electrostatic holding surface 501 is a shape that fits with the surface 1 a of the workpiece 1.

  In the film state, the mold is closed by using the mold 20 and the mold is formed. At the same time as the molding is completed, a voltage is applied to the electrostatic holding device 500. In this state, even if the mold 20 is opened, the electrostatic holding device 500 holds the film (coating film) 102 formed into a concavo-convex shape or a curved surface by suction without changing the shape.

  In this adsorbed state, the upper mold 21 is handled up to the object 1 and the object 1 and the electrostatic holding surface 501 are brought into contact with each other as shown in FIG. In this state, voltage application is turned off, and the molded film 102 is released to the surface 1a of the article 1 to be coated. With the upper mold 21 in a state where the article 1 and the film 102 are in close contact, the film 102 and the article 1 are fixed by applying chemical and physical actions such as ultraviolet irradiation and heat curing. Thereby, film coating becomes possible.

  Although the present invention has been described with reference to the drawings, according to the present invention, if the coating film is transferred and cured on the coating line by separately performing the overcoating process in the coating film forming process. Good. Here, if the coating film is cured by applying radiation such as ultraviolet rays or electron beams, the coating film is cured instantaneously, so that the construction time on the coating line can be greatly shortened. .

  Also, the painting process required skill to achieve a uniform film thickness, but if the coating film was formed in a separate process, for example, by film molding, the film thickness would increase. In particular, it is easy to form a film having a uniform film thickness, and process management becomes easier.

Moreover, if comprised like this invention, since the coating film of a required magnitude | size is provided, the waste of the coating material in a coating line can be reduced.
(Application examples)
In general, home appliances are painted by electrostatic painting, air spray, airless spray, etc., but it is said that skill is required for finishing. Thereby, when applying this invention to the coating of such household appliances, the coating film previously formed into a predetermined shape is transferred using an electrostatic holding device, or the electrostatic holding device 500 is used. The film is transferred after film formation using the mounted mold. Thereby, a film coating can be performed also to household electrical appliances by transferring the film after molding using the electrostatic holding device having the same shape as the coating location of the household electrical appliances.

  Further, the electrostatic holding device can be enlarged in recent years, and for example, an electrostatic holding surface having an area exceeding 2 m in width can be obtained. Thereby, for example, a film-like coating film molded into the shape of the vehicle body outer plate is formed even on a large-sized object such as a vehicle outer plate, The coated film can be applied in a state of being brought into close contact with the outer plate which has been subjected to the base treatment and putty-coated.

  Thereby, since a thick film can be provided without overcoating, the painting operation is greatly simplified. In addition, when a radiation curable resin such as an ultraviolet ray or an electron beam is used, a solvent such as electrostatic coating is not necessary, and the working environment in the painting line can be greatly improved. Further, the time required for curing can be greatly shortened.

  Through this, from the painting of small home appliances, toys and other general products to the painting of large vehicles, the quality of painting will be maintained, the painting construction process will be simplified, and the working environment will be improved. The present invention can be applied for various purposes such as.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and the present invention can be changed even if there is a design change or the like without departing from the gist of the present invention. included.

  For example, in the above description, the handling object is a thin object. However, according to the electrostatic holding device having an electrostatic holding surface that is shaped to be fitted to the handling object, the surface is handled if the handling object has a curved surface. Since it can be adsorbed, the object to be handled is not limited to a thin object, and a three-dimensional molded product having a stable shape may be handled.

  Moreover, in the above description, although the coating film is obtained by the method by film forming, the formation method of a coating film is not fundamentally limited. For example, it may be formed by vacuum molding or pressure molding, or by a molding method such as injection molding, compression molding or injection compression molding.

It is a figure explaining the relationship between the electrostatic holding | maintenance apparatus which concerns on this invention, and a handling target object. It is a figure explaining an example of the shaping | molding die used in the Example of this invention by a cross section. It is a figure explaining the process of forming a coating film on the surface of a shaping | molding die. It is a figure explaining the structure of a coating thing by a cross section. FIG. It is a figure explaining the condition where the coating film is sucked and held by the electrostatic holding device according to the present invention. It is a figure explaining the condition which transfers the coating film hold | maintained by the electrostatic holding | maintenance apparatus which concerns on this invention to a to-be-coated article. It is a figure explaining the condition which hardens a coating film in the state pressed by the electrostatic holding | maintenance apparatus which concerns on the modification of this invention. It is a figure explaining an example of the shaping | molding die used in the modification of this invention by a cross section. It is a figure explaining an example of the forming die concerning the present invention by a section. It is a figure explaining the process of transferring using the shaping | molding die of FIG. 9 as it is. It is a figure explaining the structure of a general electrostatic holding | maintenance apparatus.

Explanation of symbols

1: Object to be coated 1a: surface (application surface)
10: Mold 10a: Surface 10A: Mold 10Aa: Mold surface 20: Mold 21: Upper mold 21a: Surface 22: Lower mold 102: Coating film (object to be handled)
102a: outer surface 102b: inner surface (back surface)
500: Electrostatic holding device 501: Electrostatic holding surface 502a, 502b: Electrode element 503: Insulating material 504: Base member

Claims (6)

  An electrostatic holding device having a three-dimensional electrostatic holding surface that matches a three-dimensional surface shape of an object to be handled.   The transfer method which transfers the three-dimensional film molded object shape | molded by providing three-dimensional one surface shape, hold | maintaining on the electrostatic holding surface of the electrostatic holding apparatus of Claim 1 matched with the said one surface shape. 3. The surface of the object to be coated by holding the film for forming a three-dimensional coating film conforming to the three-dimensional surface shape of the object to be coated on the electrostatic holding surface of the electrostatic holding apparatus according to claim 1. Coating film transfer process to transfer to,
With the three-dimensional coating film forming film transferred to the surface of the article to be coated, the three-dimensional coating film forming film is applied to the three-dimensional coating film forming film by physically and / or chemically acting on the three-dimensional coating film forming film. A coating film applying method comprising: a coating film curing step for fixing. The electrostatic holding surface is transparent to radiation including at least one of ultraviolet rays, light rays, and electron beams,
The film for forming a coating film includes a material that cures while exhibiting adhesiveness by irradiation with the radiation,
The coating film applying method according to claim 3, wherein the coating film curing step irradiates the radiation through the electrostatic holding surface to cure the three-dimensional coating film forming film.   A mold having a three-dimensional electrostatic holding surface that matches the three-dimensional surface shape of an object to be coated.   A coating film applying apparatus in which the electrostatic holding apparatus according to claim 1 and / or the molding die according to claim 5 is incorporated in a coating film applying line.

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