JPH06190852A - Production of extreamly thin rubber sheet - Google Patents

Abstract

PURPOSE:To eliminate a levitation of a rubber and an air entrapment to easily pull out the rubber by a method wherein a kneaded rubber is calendered to a predetermined rubber thickness, attached to a cloth liner, pulled out, and vulcanized. CONSTITUTION:In a calender roll machine, a kneaded rubber 60 is successively passed through between a side roll 10 and a top roll 20, between the top roll 20 and a center roll 30, and between the center roll 30 and a bottom roll 40. Thus, the rubber is sequentially calendered in three stages to a rubber sheet 60 of a uniform thickness. This calendered rubber sheet 60 is attached to a fed cloth liner 70 between the bottom roll 40 and a rubber roll 50, pulled out, and vulcanized. With the use of the cloth liner 70 in this manner, a high adhesion is obtained between the liner 70 and the rubber 60, thus preventing an occurrence of a levitation and an air entrapment and ensuring a smooth pull-out. The cloth linder 70 substituted for release paper can be repeatedly used economically.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an ultra-thin rubber sheet applied to industrial materials such as cushioning materials, packing materials, damping materials and roofing materials.

[0002]

2. Description of the Related Art Conventionally, rubber sheets have been manufactured by calender molding or press molding. However, when trying to obtain an ultra-thin rubber sheet, there is a problem in calendering that when the rubber sheet is pulled out from the calender roll, the rubber sheet stretches or breaks and is taken up by the roll and wound. There is a limit to the extent, and it was difficult to obtain a rubber sheet thinner than this. In order to solve this, a method of manufacturing an ultrathin rubber sheet using release paper has been proposed (Japanese Patent Publication No. 3-29575).

[0003]

According to the above method, although an extremely thin rubber sheet can be obtained even by calender molding, the release paper is expensive because it cannot be used repeatedly. There was a problem. In addition, since the release paper is smooth, the adhesiveness is poor when the release paper and rubber are transferred, and floating between the release paper and the rubber sheet, air loading, and air entrapment in the rubber easily occur. Is not smooth, and problems such as winding on a roll have not been sufficiently solved.

The present invention has been made against the background of the above-mentioned problems of the prior art. When an ultrathin rubber sheet is obtained by calendering, there is no wrapping around a roll, floating between the release paper and the rubber sheet and air loading. An object of the present invention is to provide a manufacturing method capable of economically obtaining a sheet which does not have air entrapped in rubber, is not wound around a roll, is smoothly drawn out, and has a finished appearance and feel.

[0005]

The present invention is characterized in that a kneaded rubber is rolled into a predetermined rubber thickness by calender molding, transferred to a fabric liner, and then pulled out and vulcanized. A method for manufacturing a rubber sheet is provided.

The manufacturing method of the present invention will be described with reference to FIG. FIG. 1 is a schematic view showing an example of the manufacturing method of the present invention. The calender roll machine includes a side roll 10, a top roll 20, a center roll 30, a bottom roll 40, and a rubber roll 50. Kneaded rubber 60
Through the roll 10 and the roll 20, between the roll 20 and the roll 30, and between the roll 30 and the roll 40 in order, 3
Roll in stages to form a sheet of uniform rubber thickness. The rolls 10 and 20 are slightly thicker than the thickness of the rubber sheet to be obtained and rolled to about 2.0 to 1.5 times, and between the rolls 20 and 30, the rolls are slightly thinner than 1.5. ~
It is preferably about 1.2 times. Then, a predetermined thickness may be set between the rolls 30 and 40. The roll may be passed through two stages, but by gradually rolling in three stages in this way, the thickness of the sheet can be made more uniform.

In this way, the rubber sheet rolled to a predetermined rubber thickness is transferred between the cloth liner 70 and the rolls 40 and 50 that have been fed. As the fabric liner, a fabric using filament yarns such as nylon, polyester, rayon, acetate, and silk is used, but in particular, a fabric having a density of 180 to 220 yarns / inch by driving a yarn of nylon or polyester of 70 to 75 de is used. preferable. Further, as the cloth liner, cloths obtained by subjecting these cloths to processing such as fluorine processing and silicon resin processing so as to have releasability can be used. By using such a cloth liner, it is possible to improve the adhesiveness with the rubber during the transfer with the rubber, and to prevent the floating between the cloth liner and the rubber sheet, the air load, and the air entrapment in the rubber, and the withdrawal. It is possible to obtain an ultra-thin rubber sheet that can be easily processed and has a good finished appearance and feel. Further, unlike the release paper, the cloth can be repeatedly used and is very economical.

After transferring the rubber and the cloth liner between the roll 40 and the roll 50, the roll is pulled out and vulcanized,
An ultrathin rubber sheet can be continuously obtained. Vulcanization is
Even if it is vulcanized inline with a continuous vulcanizer such as a pin vulcanizer, which is an existing vulcanizer for pulling cloth, it is transferred to the fabric liner and wound into a sheet as it is unvulcanized. Vulcanize,
It may be carried out by a method called roll steaming vulcanization, but continuous vulcanization by a vulcanizing device for drawing cloth is effective in terms of efficiency and cost. According to the present invention, even by calender molding, 1.0
It is possible to obtain an ultra-thin rubber sheet having a size of less than or equal to mm and up to about 0.1 mm, and it is possible to continuously produce the sheet. The ultrathin rubber sheet thus obtained has an uneven pattern of cloth on the rubber surface. As a result, there is no sticking of the rubbers even after the fabric liner is peeled off, and the sheet is very easy to handle. Further, an ultra-thin rubber sheet having a good finished appearance and a good feel can be obtained. Furthermore, when the ultra-thin rubber sheet is used by adhering it to another material, the adhesiveness can be improved by the anchor effect. Further, since it is very difficult to process such a concavo-convex pattern into a rubber sheet later, the method of the present invention is very useful for obtaining an ultrathin rubber sheet having a concavo-convex pattern.

The peripheral speeds of the rollers may all be the same,
The feeding speed of the cloth liner and the drawing speed of the rubber sheet may be adjusted to these values. Up to this point, the case where the fabric liner is transferred to one side has been described, but in the same manner,
A fabric liner may be transferred on both sides. A schematic diagram of the manufacturing method in this case is shown in FIG. In this case, after being transferred between the rolls 30 and 40 with the fed fabric liner 71, it is further transferred between the rolls 40 and 50 to the non-rolled rubber surface of the fabric liner. The cloth liner 72 is transferred. The ultrathin rubber sheet obtained in this manner has uneven patterns on both sides.

[0010]

In the present invention, when an ultrathin rubber sheet is obtained by calender molding, a cloth liner is used instead of a smooth release paper. Since the surface of conventional release paper is smooth, the adhesion to rubber is poor, and it is unavoidable that rolls get caught and roll around, or floating between the rubber and release paper, air loading, and air entrapment in the rubber occur. It wasn't smooth. However, in the present invention, since the cloth liner is used, the adhesion to rubber is good and all the above problems are solved. Further, since the rubber surface has an uneven pattern, a sheet having a good finished appearance and feel can be obtained, and the fabric can be repeatedly used, which is very economical.

[0011]

EXAMPLES The present invention will be described in more detail below with reference to examples. Example 1 An ultra-thin rubber sheet with a one-sided fabric was manufactured using the kneaded CR rubber in the process shown in FIG. The roll 40 has a rubber thickness of 0.20 mm, the gap between the rolls 10 and 20 is 0.40 mm, and the gap between the rolls 20 and 30 is 0.30 m.
m, and the gap between the rolls 30 and 40 was set to 0.20 mm. The gap between the rolls 40 and 50 was 0.27 mm.

The kneaded CR rubber 60 was passed through rolls 10 to 40, gradually rolled, and transferred to a cloth liner 70 sent between rolls 40 and 50. The fabric liner was 0.07 mm thick nylon taffeta. After transferring and dusting as described above, the mixture was continuously vulcanized by a continuous open vulcanizer. Vulcanization is 130-160 ℃
At a speed of 5 m / min. After vulcanization, the cloth was peeled off to obtain an ultrathin rubber sheet. The unevenness of the cloth was transferred to one side of the comb sheet.

Example 2 An extremely thin rubber sheet with a double-sided fabric was manufactured by using the kneaded SBR rubber in the process shown in FIG. The roll 30 has a rubber thickness of 0.20 mm, the rolls 10 and 20 have a gap of 0.35 mm, and the rolls 20 and 30 have a gap of 0.30.
It was set to mm. The gap between rolls 30 and 40 is 0.20m
m, and the gap between the rolls 40 and 50 was 0.27 mm. The kneaded SBR rubber 60 is passed through rolls 10 to 30 and gradually rolled, and transferred between the rolls 30 and 40 with the sent fabric liner 71, and then the roll 40 again.
Between the No. 50 and No. 50, the cloth liner 72 and the rubber surface without the cloth liner were transferred. The same fabric liner as in Example 1 was used. This was vulcanized in the same manner as in Example 1 to obtain an ultrathin rubber sheet with a double-sided fabric liner.

[0014]

According to the manufacturing method of the present invention, an extremely thin rubber sheet having a thickness of about 1.0 mm to 0.1 mm is wound around a roll by calender molding, floating between a rubber and a fabric liner, air loading, and rubber inside. It is now possible to manufacture the product without causing air entrapment and withdrawing it easily. Also, since the rubber surface has an uneven pattern, the finished appearance,
A sheet having a good feel can be obtained, and the fabric can be repeatedly used, which is very economical.

[Brief description of drawings]

FIG. 1 is a process schematic diagram showing an example of a manufacturing method of the present invention.

FIG. 2 is a process schematic diagram showing an example of another manufacturing method of the present invention.

[Explanation of symbols]

 60 rubber 70 fabric liner

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Claims (1)

[Claims] 1. A method for producing an ultrathin rubber sheet, which comprises rolling a kneaded rubber into a predetermined rubber thickness by calendering, transferring the kneaded rubber to a fabric liner, and then pulling it out and vulcanizing it.