JP2563922B2 - Rubber blanket for printing - Google Patents

Description

TECHNICAL FIELD The present invention relates to a rubber blanket for printing.

[Conventional technology and its problems]

Conventionally, a printing rubber blanket is composed of a rubber surface layer and a reinforcing layer bonded to the lower layer by a rubber layer.
Most of the reinforcing layer is formed by using spun yarn made of short fiber yarn as a base fabric. However, a printing rubber blanket having a reinforcing layer formed by using short fiber threads as a base fabric,
There was a problem that dimensional changes were unavoidable due to the load due to machine operation, and the printing machine had to be stopped during operation to compensate for dimensional changes. That is, the length of the printing rubber blanket is extended due to the repeated loading due to the operation, and the thickness referred to as a set is reduced, so that the resilience to the printing pressure is reduced. This makes continuous operation of the printing machine impossible. Therefore, it has been necessary to correct the length and thickness by temporarily interrupting the printing operation and re-tightening the printing rubber blanket. There has been a problem that the skill of the operator is required to reduce the work for the correction as much as possible.

The present invention has been made in view of the above points, and it is possible to prevent the occurrence of stretching and settling, to enable smooth operation of a printing machine, and to eliminate the need for the skill of an operator. It provides a blanket.

[Means for solving problems]

The present invention is a printing rubber blanket comprising a rubber surface layer and a plurality of reinforcing layers formed below the rubber surface layer, with the rubber layer quality interposed therebetween, wherein the reinforcing layer excluding the reinforcing layer immediately below the rubber surface layer. A rubber blanket for printing, characterized in that a spun yarn obtained by forming a core yarn with an artificial long-fiber yarn having a surface coated with short-fiber yarn is stretch-processed and then heat-set. .

Here, the deposition of the short fiber yarns constituting the spun yarn may be performed partially on the long fiber yarns or may be performed by covering the entire long fiber yarns.

[Action]

According to the present invention, after the reinforcing layer except the reinforcing layer immediately below the rubber surface layer is stretched, the spun yarn is formed by forming the core yarn with the artificial long fiber yarn having the short fiber yarn adhered to the surface thereof. Since it is heat-set, it is possible to fix the weft crimp, which is one component of the long fiber system.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a schematic configuration of an embodiment of the present invention. The printing rubber blanket 10 is applied to lithographic printing, for example. In the figure, 1 is a rubber surface layer. On the lower surface of the rubber surface layer 1, a first reinforcing layer 2, a rubber layer 3, a second reinforcing layer 4, a rubber layer 3 and a third reinforcing layer 5 are sequentially formed. The first, second and third reinforcement layers 2, 4, 5 are
An artificial long fiber yarn 6 having a short fiber yarn attached to its surface is constituted by a warp yarn 6a and a weft yarn 6b as core yarns. As a spun yarn configured by using the warp yarn 6a and the weft yarn 6b as the core yarn, for example, there is a core span. The core span uses a high-strength yarn 150D (denier) for ester filament yarn material as the core yarn,
As the short fibers to be adhered, a raw yarn made of cotton, staple fibers, synthetic fibers, etc. is used. In addition, the second and third reinforcing layers 4,5
Is stretched. Figure 2 (A) shows
The 2nd, 3rd reinforcement layers 4 and 5 before stretch processing are shown, and the figure (B) shows the 2nd and 3rd reinforcement layers 4 in the state where the whole fabric width is reduced by about 20% by the stretch processing. , Is shown. The warp yarns 6a and the weft yarns 6b before the stretch process show a wavy crimp in a balanced natural shape based on the interlacing pressure according to the thickness and the density of the warp yarns 6a and the weft yarns 6b.
And the wave height (h) of the weft 6b is stable. However, the rubber blanket for printing repeatedly stretches the tension in the warp direction, and the warp crimp stretches to cause permanent elongation.
As shown in FIG. 6B, the woven fabric has a woven structure in which the warp crimp is removed by subjecting the woven fabric to a stretch process in advance. By the way, the fabric width is reduced by 15-25% by stretching it in the warp direction by stretching. Also, warp 6a
Is stretched into a substantially straight line, the crimp is transferred in the weft direction, the wave height of the weft yarn 6b is weighted, and the crossing state of the warp and weft yarns 6a and 6b is p '= 0.8p, h' = 2d + D. There is.

According to the rubber blanket 10 for printing configured as described above, the first, second, and third reinforcing layers 2, 4, 5 are artificial long fiber yarns having short fiber yarns adhered to the surfaces thereof as core yarns. Since it is made up of spun yarn such as corespun, the structure is changed to, for example, a twill weave structure to increase the bending of the warp yarn 6a and the weft yarn 6b, and to thicken the woven fabric to improve the printing pressure shock absorbency and resilience. Can be made. Further, by making the structure of the reinforcing layers 2, 4 and 5 into a satin weave structure, the warp 6a and the weft 6b are close to a straight line with a small number of intersections and a small bend, and the dimensional changes of both the warp 6a and the weft 6b are made. Can be prevented.

Further, by forming the reinforcing layers 2, 4 and 5 with spun yarn such as core spun, it is not necessary to use expensive fiber such as Egyptian cotton that has been conventionally used, and the manufacturing cost can be reduced. In the case of corespun, the ester filament high-strength yarn 150D is used for the core yarn, and cotton, staple fiber, etc. are used for the adhered short fiber yarn, but the ester filament fiber has about twice the tensile strength of cotton fiber. However, the elongation curve (S · S curve) is also excellent in initial tensile strength, and elongation caused by slippage between single fibers, which has been observed in conventional spun yarns, does not occur at all.

In addition, the second and third reinforcing layers 4 and 5 are stretched to have a base fabric structure in which the wave height of the weft yarn 6b is increased to reduce the fabric width, and the thermoplastic property of the core yarn ester fiber is utilized. The weft crimp can be fixed by performing heat setting (heat setting). Therefore, the crushed weft shape is unlikely to occur, and the corrugated crimp of the heat-fixed ester fiber can improve the printing pressure shock absorption like a myriad of minute spring structures. At this time, 30 to 50 in the ester fiber 150D of the core yarn
If 3 to 5 monofilaments of D are bundled to form a core spun yarn having a high apparent Young's modulus, the above effect can be further enhanced. Further, since the yarn surface is covered with the short fibers, the fluff can bite into the rubber layer, and good adhesiveness can be exhibited by the "anchoring" effect.

Next, another embodiment of the present invention will be described with reference to FIG. In this rubber blanket 15 for printing, a warp parallel type reinforcing material is provided between the first reinforcing layer 2 and the second reinforcing layer 4 in the intermediate layer 11.
The spun yarn 10 ^{S that} is provided as the above and constitutes the reinforcing layers 2, 4 and 5 was configured in the same manner as in the above-mentioned example, except that the glass yarn 300D was used as the core yarn. The same parts as those in the embodiment of FIG. 1 are designated by the same reference numerals.

Here, the formation of the intermediate layer 11 is performed as follows when the yarn interval is small and the density is relatively high. That is, the warp 6a of the core spun yarn spun into 10 ^S with the glass fiber yarn 300D wound around the warp beam as the core yarn is passed through the size liquid tank while keeping the warp beams parallel to each other by the width constant, and the adjacent warp yarns 6a They are adhered to each other by the fluff covering the surface of.
The warp yarns that are bonded in parallel and constitute the intermediate tank 11 are dried by a heater and wound into a winding beam.

When the reinforcing layers 2, 4 and 5 with low density and large yarn spacing are used, the warp beam is set on the loom and the normal weft 6b is used.
6b warp yarn 6b in the shape of a temporary weave in which any fine yarn, eg 80 ^S , 50D, etc.
Try to keep the alignment of. The intermediate layer 11 is formed by using a warp aligning means in a weaving process.

In addition to the one in which the aligning step is performed before the parallel bonding of the parallel yarns as described above, a warp beam wound with a required number of parallel yarns is directly installed on the lamination bonding device and pulled out from this. The parallel yarns may be laminated and adhered while being aligned while being aligned by a width sizing provided immediately before the adhesion, or a roller having a groove engraved, to obtain the reinforcing layers 2, 4, and 5.

According to the printing rubber blanket 15 thus configured, the non-woven structure is formed only by the splicing yarns 6a arranged in parallel, but the core span of the warp yarns 6a is made by spinning the glass yarn 300D to 10 ^S as the core yarn. ing. As is well known, glass yarn is excellent in tensile strength, especially in initial tensile strength, but it is said that the weaving requires special equipment and technique, which results in high cost. However, since the core span is adopted in this embodiment, the same weaving equipment as the spun yarn may be used. Further, in the conventional case, the surface of the glass yarn is particularly smooth, and a pretreatment is required for adhesion with the rubber, which causes a problem that the product is hardened and flexibility is deteriorated. However, since the core span is used in this example, no adhesive treatment is required due to the "anchoring effect" of the adhered short fibers. Also, since the core span is adopted in the warp parallel method, the weaving process is omitted, or the weft
It is possible to reduce the production cost without needing the 6b and without needing an adhesive treatment that impairs the feeling, and without impairing the properties of the glass fiber.

Further, in general, as a woven property, crimping of the yarn in the tensile direction due to the intersection of the warp yarn 6a and the weft yarn 6b may cause local concentration of the load to reduce the strength. Is linear, the load in any cross section is equal and the integrated strength proportional to the number of yarns can be exerted. Since the intermediate layer 11 made of warp parallel yarns is used in this embodiment, the stretching step may be omitted for the second and third reinforcing layers 4 and 5.

〔The invention's effect〕

As described above, according to the printing rubber blanket according to the present invention, the printing rubber blanket is prevented from being stretched or settled to enable smooth operation of the printing machine.
This has a remarkable effect that the skill of the operator can be eliminated.

[Brief description of drawings]

FIG. 1 is a sectional view showing a schematic configuration of an embodiment of the present invention,
FIG. 2 is an explanatory view showing a state before and after stretch processing is applied to the reinforcing layer of the same embodiment, and FIG. 3 is a sectional view of another embodiment of the present invention. 1 ... Rubber surface layer, 2 ... First reinforcing layer, 3 ... Rubber layer, 4 ... Second reinforcing layer, 5 ... Third reinforcing layer, 6 ... Core yarn, 6a ... Warp, 6b …… Weft, 10 , 15 …… Rubber blanket for printing.

Claims (1)

(57) [Claims] 1. A rubber blanket for printing comprising a rubber surface layer and a plurality of reinforcing layers below the rubber surface layer, which are sequentially formed through the rubber layer material, wherein the reinforcing layer except the reinforcing layer immediately below the rubber surface layer. A rubber blanket for printing, wherein a spun yarn obtained by forming a core yarn of an artificial long fiber yarn having a short fiber yarn attached to the surface is stretch-processed and then heat-set.