JPH06297877A - Printing rubber blanket - Google Patents

Abstract

PURPOSE:To prevent blanket from dimensionally changing and give compression function to the blanket by a method wherein blended yarn or twisted union yarn consisting of respective specified long and short fiber cottons is used as rubber reinforcing foundation raw yarn in the printing rubber blanket prepared by laminating reinforcing longer on rubber skim. CONSTITUTION:Solid type printing rubber blanket is produced by laminating auxiliary foundation 2, rubber bonding layer 3 and main foundation 4 underside rubber skim 1 in the order named. In this case, blended yarn or twisted union yarn consisting of long artificial fiber cotton, which is prepared by cutting high tensile chemical fiber into about 10-30cm lengths, and arbitrary short fiber cottom having the length up to about 5cm is used as the warp 5 and weft 6 composing the main foundation 4. On the other hand, by laminating either one or both of (a) foundation prepared by setting bonding warp of lengthwise and crosswise bonding multiple structure at arbitrary angle and (b) foundation, as the weft of crosswise multiple structure of which bulky yarn is used, as compression layer P to the rubber blanket as foundation body, compressive type printing rubber blanket is produced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a rubber reinforcing layer and a compression layer of a printing rubber blanket (hereinafter referred to as a blanket).

[0002]

2. Description of the Related Art A blanket includes a solid type blanket composed of a rubber surface layer and a plurality of layers adhered to the rubber layer below the rubber layer, or a single-layered base fabric reinforcing layer, and a gas such as sponge in the middle thereof. A compressible type blanket having an additional compression layer is widely used. In each of these, a blanket is mainly laminated by using a short fiber spun yarn of a fibrous material for a rubber-reinforcing base fabric, and the blanket is wound around a printing machine blanket cylinder to be used. It is well known that many studies and attempts have been made in order to eliminate defects by using chemical fiber long fiber yarn (filament yarn) instead of short fiber spun yarn.
(Actual Kosho 35-13304, Japanese Examined Sho 48-12953,
53-46205 / 57-36452 / 57-77592 / 63-249696)

[0003]

In both solid type and compressible type blankets, dimensional changes such as extension of length or reduction of thickness due to load associated with machine operation cannot be avoided, and printing pressure is inevitable. Since the buffering / restoring property against the above deteriorated and continuous operation became impossible, it became necessary to adjust the length and thickness by interrupting the temporary work and re-tightening the blanket or inserting the underlay packing. In addition, in the solid type blanket, there is a risk that the sharpness of printing is impaired due to the bulging phenomenon associated with the printing pressure. Even in a compressible type blanket in which a sponge layer is additionally laminated to prevent bulging, the thickness of the sponge layer that can be used is limited to about 0.5 mm or less in order to provide sufficient printing pressure and obtain clear printing. Is
If the thickness is too thick, it will not be able to obtain the necessary printing pressure due to the "goodwill pushing the arm", and due to the load accompanying the rotation, the dynamic stability of the blanket surface will be lost and the clarity of printing will be impaired.
The compression performance was also limited. It is also well known that attempts have been made to adopt chemical fibers (mainly filament yarns) in order to solve these problems, but as a result of lack of lamination adhesiveness and flexibility, poor air permeability, etc. In the present situation, there is much more to lose than to gain, and it has not been put to practical use. In order to solve the above problems, the present invention newly elucidates the factors causing the problems and develops a new technology corresponding to them. As a result, it is possible to prevent the dimensional change of the blanket, the deterioration of the cushioning / restoring property, and the like, and to add a new and excellent compression function, thereby completing the invention.

[0004]

[Means for Solving the Problems] As a means for clarifying the process of dimensional change occurring during use of a blanket, three types of blankets using twisting numbers of 3, 4, 5 for warp yarns were produced, and the results of repeated printing experiments Overall, it was confirmed that the main cause of elongation of the blanket is due to slippage between the single fiber bundles forming the spun yarn, rather than due to fiber deterioration.
Further, the decrease in the thickness of the blanket is a compression crushed shape due to the printing pressure of the main base cloth weft crimp corrugation, and from these results, the inventor adopted the following means to solve the problem.

Blanket stretch prevention means. In order to prevent slippage between single fiber bundles, a new blended yarn of long-fiber cotton obtained by cutting high-tensile chemical fibers to about 10 cm to 30 cm and conventional short-fiber cotton is newly developed and used as the base yarn. At this time, due to the spinning characteristics, long-fiber cotton mainly concentrates on the core portion and short-fiber cotton covers the yarn surface, but the end of the long-fiber cotton portion of the core is intricately entangled with the short-fiber cotton on the yarn surface to form an integral yarn sleeve. To form.

Means for preventing blanket thickness reduction. A thermoplastic chemical fiber is used for the long-fiber cotton of the core of the mixed-spun yarn, and the crimp waveform of the weft yarn is heat-set (heat-set) to prevent crushing due to printing pressure.

Means for imparting compressibility to the blanket. Instead of the conventional gas spring structure, the warp / weft double woven structure shown in FIG. 4 is used, and the knotting warp yarns that connect the upper and lower fabrics are used as the compression spring structure. The physical properties of the binding warp yarn and the binding method are selected to suit various printing purposes.

As another means for imparting compressibility to the blanket, a weft double weave or a weft double design with a warp warp yarn is used, and a large amount of chemical fiber bulky yarn is woven into the weft yarn to obtain a unique and excellent result. An aerated and infinite number of twisted yarns are used as a fine spring structure.

[0009]

[Function] Short fiber spun yarn 2 which has been generally used conventionally
The 0th yarn has a twist length of K = 4 with a fiber length of about 5 cm or less, so that the twist number t of about 5 cm is 36. On the other hand, since the core fiber length of the blended yarn of the present invention is 10 cm to 30 cm, if K = 4, 72 t to 216 t are twisted in the meantime, and as a result, the frictional force between the fiber bundles is significantly increased. Strengthens the anti-slip effect.

Usually, the main base cloth is a plain weave and has a weft density of 55 / inch and a cover factor of K = 17.
At this time, if the fiber length is 5 cm, there are about 110 warp / weft crossing points (texture points) between them, but the fiber length is 10
In the case of cm to 30 cm, there are approximately 220 to 660 intersections between them. That is, the twisting frictional force is remarkably increased and
The increase in the cross frictional force of the weft is added to the weight, and the effect of preventing the blanket from stretching due to slippage between the single fiber bundles becomes extremely strong.

Due to the spinning characteristics, the yarn surface is mainly covered with short fiber cotton, and the long fiber cotton is concentrated in the core portion, but its ends are intricately entangled with the yarn surface short fiber cotton to form an integral blended yarn. . As a result, the long-fiber cotton end bites into the adhesive rubber layer together with the short-fiber cotton during the lamination and adhesion, and maintains a flexible and strong adhesive action like the conventional blanket.

The warp and weft yarns exhibit a balanced crimp waveform and are difficult to be deformed by the printing pressure due to the shrinkage caused by the base fabric, but the warp yarn crimps are stretched and the blanket is stretched by the tension accompanying the machine operation. From the place where it stretches, the raw fabric is stretched in advance to remove the warp crimps and make it straight. As a result, as shown in FIG. 2A → B, the warp yarn crimp displaces in the weft direction and the base of the imaginary triangle contracts, the height increases, and the shape becomes unstable.
The thickness of the blanket is reduced by gradually compressing and crushing. On the other hand, the blended yarn of the present invention uses a thermoplastic fiber for the long-fiber cotton of the core, and heat-fixes the weft crimp after stretching the woven fabric to prevent collapse due to printing pressure and prevent thickness reduction. To strengthen.

Due to the printing pressure, a bulge corresponding to a depression (nip pressure) is generated on the blanket surface. The laminated base cloth and the underlay packing material prevent a certain amount of bulging, but since this is not enough, a compression layer has conventionally been formed by using a gas layer such as a sponge. In the present invention,
Instead of this sponge layer, (a) a warp-weft binding double structure is used, new consideration is given to the binding method and the physical properties of the binding yarn, and the aeration between the upper and lower fabrics is used. To form a compression layer. (B) Weft-processed chemical fiber is used for weft of multiple weave, and the compression layer is constructed by utilizing its excellent air content and the compressive elasticity of innumerable bent yarns. By additionally laminating each of the above (a) and (b) or both of them on the "claim 1" solid type blanket or the conventional blanket, it is possible to impart excellent actions such as compressibility, cushioning and restoring property. it can.

[0014]

EXAMPLE 3 Example 3 of the present invention will be described.

First embodiment. It forms the basis of the present invention and is used as a main base fabric for a solid type blanket according to claim 1. The woven standard is the same as the conventional one, the warp yarn is 20 count twin yarn, the weft yarn is 20 count single yarn, and the warp yarn density is 55 /
Inch, weft density 60 / inch, plain weave design.
Under the rubber surface layer (1) shown in FIG. 1, an auxiliary base fabric (2), a rubber adhesive layer (3) and a main base fabric (4) are sequentially laminated. (5)
Warp yarn, (6) shows weft yarn, the main base cloth (4),
"Figure 2" B is used. Conventionally, high-grade raw cotton spun yarn has been forced to be used, but in the present invention, a mixed spun yarn of artificial long fiber cotton and arbitrary short fiber cotton or a twisted yarn is used instead. As the auxiliary base fabric (2), a warp plain weave (poplin grade) having a fine count as compared with the main base fabric is used to prevent lateral extension of the blanket, but this may be omitted.
"Fig. 2" A shows the raw fabric, which is the shrinkage that accompanies the fiber making.
The weft thread has a balanced wavy crimp. B is
This is stretched to remove warp crimps,
The warp threads are straight, the warp and weft woven fabrics are weft woven fabrics, the weft crimp wave height is increased, and heat setting is applied under this form.

Second embodiment. “Claim 2” b) It is a constituent material of the compression layer (P) of the compressible blanket, and uses the warp / weft-bonding double plain weave design shown in FIG. Figure 4
Is an explanatory view showing a binding method of upper and lower fabrics, (S) shows a binding warp thread, C is a single binding method, D is a double binding method, and E is a double binding method.
The figure shows the stick-on method. Three types of knotting methods, crossing angles, and physical properties of knotted warp yarns are designed to suit the printing purpose by giving consideration to the hardness / softness / thickness of the material to be printed and its deviation, and to give the desired compressibility. This is laminated on a solid type blanket to form a compressible blanket.
It is also possible to combine the single-type and double-type joining methods to form a saw-tooth shape (right-angled triangular shape) or its left-right symmetrical shape, and it is also possible to additionally laminate a thin layer of bubble-sealing sponge.

Third embodiment. The compression layer of the compressible blanket according to "claim 2" is used, and a weft double weave or a weft double weave with a core warp yarn is used. Shows the case. "Figure 5" is the organization chart, (a) front organization, (b) back organization,
(C) A weaving diagram with core warp threads is shown. The ground warp (H) is
Although any spun yarn may be used, high-strength chemical fiber yarn is used for the core warp yarn (W), and bulked yarn is used for the front weft yarn (F) and the back weft yarn (G). (C) As is clear from the figure, the core warp thread (W) is below all the front weft threads (F),
It becomes the upper side of all the back weft threads (G) and is woven in a straight line without intersecting with (F) and (G). (C)
Although the structural ratio of H: W = 2: 1 is shown in the figure, it may be set to an arbitrary ratio depending on the purpose of use.

[0018]

[Effect] The effect of the present invention will be described for each claim item and overall.

[Claim 1] The effect of the new blended spinning. In the blended yarn of the present invention, the long fiber cotton is used for the core portion to prevent the blanket from being stretched by removing the slip between the single fiber bundles, which has been inevitable in the past. Also, by adopting the thermoplastic fiber of the core, the weft crimp corrugation is heat-fixed, the compression collapse shape due to the printing pressure is prevented, and the good cushioning / restoring property is maintained, thereby preventing the blanket thickness from decreasing. It has been conventionally known to use a core spun yarn using a filament yarn in the core (Japanese Patent Laid-Open No. 63-249696). However, unlike a spun yarn, a filament yarn has a single fiber closely adhered in parallel and is poor in air content and has a buffering property. It does not entangle with the covering short fiber cotton because it is endless, and it shows a separate behavior due to slippage between the core part and the covering part, especially under compression load due to printing pressure, and pressure synergistic effect cannot be obtained . On the other hand, in the blended yarn of the present invention, the core long-fiber cotton end and the coated short-fiber cotton are intricately entangled with each other to form an integral yarn ridge, and the integrated effect of the core and the coating is exhibited without causing slippage. Furthermore, the long-fiber cotton terminal maintains excellent adhesiveness and flexibility due to the nailing effect on the adhesive rubber layer together with the short fiber, and dimensional changes and buffer restoration deterioration are eliminated by these various effects, and it is an excellent solid. A type blanket can be constructed. By using the twisting method instead of the mixed spinning method, it is possible to obtain an effect similar to this at a low cost.

[0020] The "compressed layer structure of claim 2" b)
The effect of using a horizontal knot double weave. Instead of using the sponge layer that has been conventionally used, the pressure resistant elasticity of the knotted warp thread (S) shown in FIG. 4 is used. C is a single binding method and the binding yarn is almost vertical to the U-shape, D is a double binding method, and the binding yarn is V-shaped, and any inclination angle can be given. When a conventional gas spring is used, in order to obtain a sufficient printing pressure and to secure the dynamic stability of the blanket surface, it is inevitable to suppress the compression layer thickness and the compression rate is small. On the other hand, in the present invention, the solid spring action of the knotted warp thread (S) holds a sufficient printing pressure, the dynamic stability of the blanket surface can be secured even under high speed rotation, and the thickness of the compression layer can be doubled. In addition, excellent compressibility and cushioning / restoring property are imparted, whereby the permissible range for the physical properties of the printing material and its deviation can be expanded. Further, the sticking type (W-shaped) knotting method shown in Fig. E has an effect of sticking it when using a smooth and slippery raw thread such as a metal thread, and can be used for both single-type and double-type knotting methods. In addition to the exemplified double woven fabric, a multiple woven fabric can be adopted by using the same binding technique as long as the dynamic stability of the blanket surface can be secured.

The effect of using the bulky textured yarn in the compression layer constitution of "claim 2" b). The weft double weave is used as another means instead of the warp / double weave double weave in the preceding paragraph for the compressed layer constituent material.
As shown in FIG. 5, the bulky processed yarns (G and F) have a double-sided structure, and a large amount of weft yarns can be incorporated into the unit area to enhance the compressibility. The innumerable bends that are peculiar to bulky processed yarns have a fine solid spring structure that, together with a large amount of air, maintains the dynamic stability of the rubber surface layer that cannot be obtained with conventional air spring structures, and compresses and compresses. It is possible to obtain an excellent effect of buffering / restoration. Further, by using the high-strength chemical fiber yarn as the core warp yarn (W) shown in "Fig. 5" (c), not only the linear fabric is reinforced by utilizing its linearity, but also the main fabric stretching process is omitted. Also has the effect of enabling. By using a torn diagonal pattern in the double structure, the effect of preventing twisting of the blanket due to the twill line is added. The compression layer structure by the weft double weave using this bulked yarn is
Compared with the above-mentioned knotted double weave, low-cost production is possible, the performance is almost similar to this, and there is an effect of obtaining a compressible blanket corresponding to a relatively low-cost printing purpose.

In addition, the effect of using both the solid spring system and the gas spring system. In lithographic printing, in order to satisfy the conditions according to the printing purpose, a large number of subdivided blanket types,
Since various underlaying materials for hard, semi-hard, and soft tailoring are required for body making, and complex selection and installation of these complicated various requirements require high skill and skill, the effects of the above 3 items can solve these problems. However, in addition to this, by additionally laminating a bubble-sealing type gas spring thin layer such as a sponge together with the compression layer structure of the present invention, it is possible to further add soft compressibility. It is also possible to additionally laminate the compression layer of the present invention on a blanket having a conventional structure. As described above in detail, by using a solid type blanket whose size change has been cut off by a new blending method and a compressible type blanket in which a high performance compression layer is additionally laminated based on this, a high level of skill and skill is required. Without doing so, manpower can be omitted and the loss of work interruption can be eliminated. Further, when the blanket having such a structure is mounted, the conventional underlayment or packing can be eliminated and the blanket cylinder can be directly adhered or magnetized.
In the conventional mounting method, the tension when tightening on the body is not evenly distributed over the entire blanket, but is large near both ends, sometimes the blanket is hardened to reduce the thickness, the sponge layer is crushed, or the mounting groove during operation. It had some problems such as easy cutting at the corners. However, in the blanket of the present invention, this kind of defect cannot occur, and the use of the adhesive does not require the notch groove for mounting the blanket of the cylinder, and the complicated operation of the blanket described above can be omitted even when the blanket is attached or detached. , The cylinder can be operated easily under slow rotation, the work rationalization and labor saving effect are extremely large, and the contact rotation with other cylinders is remarkably smooth, which reduces vibrations, noise and abrasion of the machine and reduces bearings and plates. Also, good results can be obtained, and the loss of the blank portion of the printing paper due to the notch groove can be omitted, and printing close to a continuous pattern can be performed on the web (rotary press). In addition, due to the dimensional invariance of the blanket, the improvement of compression performance, and the expansion of the allowable range for various deviations, a small number of products have conventionally required a large number of subdivided blankets and underlay materials to supplement the printing purpose. It also has the effect of being able to respond. As described above, by using the blanket of the present invention, not only the problems that have been conventionally desired to be improved can be solved but also excellent compression performance can be added, which greatly contributes to the rationalization of the lithographic printing process. You can do it. In addition, the blanket can be used not only for lithographic printing but also for relief printing and intaglio printing by using only a compression layer or a solid type single layer. It is possible to contribute to the improvement of the printing process.

[Brief description of drawings]

[Fig.1] Weft thread of solid type blanket (6)
View along the line.

FIG. 2 is a cross-sectional view taken along a weft yarn showing a base fabric of a main base fabric and a state in which the fabric is stretched and subjected to crimp dislocation.

FIG. 3 is a cross-sectional view of a compressible blanket in which a compression layer is additionally laminated in the middle of a solid type blanket.

FIG. 4 is an explanatory view of a knotting method for a warp / weft knitting double plain weave for forming a compression layer.

FIG. 5 is a weft double-breakage twill weave structure diagram with core warp threads for forming a compression layer.

[Explanation of symbols]

 1 Rubber surface layer 2 Auxiliary base fabric 3 Adhesive layer 4 Main base fabric 5 Warp yarn 6 Weft yarn A Raw fabric B Stretched fabric P Compressed layer C Single binding method D Double binding method E Fastening method S Fastening method Y Table Organization chart B Back organization chart C Weaving chart F Front weft thread G Back weft thread H Warp warp W Core warp thread

Claims (2)

[Claims] 1. A rubber surface layer and a printing rubber blanket laminated by adding a reinforcing layer to the rubber surface layer. Long-fiber cotton obtained by cutting high-tensile chemical fiber into about 10 cm to 30 cm as a base fiber for rubber reinforcing. A solid type rubber blanket for printing, characterized in that it is laminated by using a mixed spun yarn or a mixed twisted yarn with an arbitrary short fiber cotton up to about 5 cm. 2. A rubber blanket for solid type printing or a blanket having a conventional structure constructed according to claim 1 is used as a base body, on which a compression layer constituting material a)
Weft knotting A base fabric composed of knitting warp yarns of multiple structures at arbitrary angles. (B) Weft A multi-structured weft yarn with a textured yarn. A compressible type rubber blanket for printing, characterized in that any one or both of the above (a) and (2) are additionally laminated.