JP3587210B2 - Manufacturing method of ultra-thin rubber sheet with grain - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a method for producing an ultra-thin rubber sheet with a grain applied to industrial materials such as a cushioning material, a packing material, a vibration damping material, and a roofing material.
[0002]
[Prior 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 is stretched or cut, and is taken up by the roll and wound. The limit is about 0.5 mm, and it has been difficult to obtain a rubber sheet thinner than this. In order to solve this, a method of manufacturing an ultra-thin rubber sheet using release paper has been proposed (Japanese Patent Publication No. 3-29575).
[0003]
[Problems to be solved by the invention]
According to the above method, even in calendering, an extremely thin rubber sheet can be obtained, but since the release paper is smooth, the adhesion between the release paper and the rubber is poor when transferring the rubber to the release paper. Problems such as floating between the pattern paper and the rubber sheet, air loading, and air entrainment in the rubber are likely to occur, the drawer is not smooth, and the roll is wound around a roll.
[0004]
The present invention has been made in view of the problems of the prior art described above.When an ultrathin rubber sheet is obtained by calendering using release paper, there is no winding around a roll, and there is no floating or air between the release paper and the rubber sheet. It is an object of the present invention to provide a manufacturing method capable of obtaining an ultrathin rubber sheet having no load, no air entrainment in rubber, no winding around a roll, a smooth drawer, and a good finished appearance and feel.
[0005]
[Means for Solving the Problems]
In the present invention, the kneaded rubber is rolled by calendering to form a rubber sheet, and then the rubber sheet is transferred between rolls onto release paper with a grain having a grain depth of 0.005 mm to 0.3 mm. Thereafter, the method is to provide a method for producing an embossed ultra-thin rubber sheet, which is pulled out and vulcanized by pin vulcanization or roll steam vulcanization.
[0006]
The manufacturing method of the present invention will be described with reference to FIG. FIG. 1 is a schematic view showing one example of the production 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. The kneaded rubber 70 is sequentially passed between the rolls 10 and 20, between the rolls 20 and 30, and between the rolls 30 and 40, and kneaded and rolled in three stages to form a sheet having a uniform rubber thickness. And The rolls 10 and 20 are slightly thicker than the thickness of the rubber sheet to be obtained, and are rolled to about 2.0 to 1.5 times. It is preferable to set it to about 1.2 times. Then, a predetermined thickness between the roll 30 and the roll 40 may be set. Rolling may be performed in two stages, but by rolling the film little by little in three stages, the thickness of the sheet can be made more uniform.
[0007]
Thus, the rubber sheet rolled to a predetermined rubber thickness is transferred between the roll 40 and the roll 50 with the release paper 80 with the texture sent from the guide roll 60. The release paper with a grain is preferably one having a grain depth of about 0.005 mm to 0.3 mm, and more preferably 0.005 to 0.05 mm. For the first time, the use of release paper with such a texture can improve the adhesion between the rubber and the rubber when transferring to the rubber, and eliminate the occurrence of floating between the release paper and the rubber sheet, air loading, and air entrapment in the rubber. Thus, it is possible to easily draw out and obtain an extremely thin rubber sheet having a good finished appearance and feel.
[0008]
After the rubber and the release paper with a grain are transferred between the rolls 40 and 50, this is pulled out and vulcanized to continuously obtain an ultra-thin rubber sheet with a grain. Even if vulcanization is performed in-line with a continuous vulcanizer such as a pin vulcanizer that is an existing vulcanizing machine for drawing cloth, the release paper is transferred and rolled into a sheet unvulcanized, This may be performed by a method called vulcanization vulcanization, in which vulcanization is performed later.
FIG. 3 shows a cross-sectional view of the ultra-thin rubber sheet thus obtained. An uneven pattern is formed on the surface of the rubber 70 by the release paper 80. Thereby, even after the release paper is peeled, there is no sticking of rubbers, and the sheet is very easy to handle. In addition, an extremely 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 being bonded to another material, the adhesiveness can be improved by the anchor effect. Further, since it is very difficult to process such an uneven pattern into an ultra-thin rubber sheet later, the method of the present invention is very useful when obtaining an ultra-thin rubber sheet having an uneven pattern. According to the present invention, an ultra-thin rubber sheet having a thickness of 1.0 mm or less can be obtained by calendering and can be continuously produced.
[0009]
Note that the peripheral speeds of the rollers may all be the same, and the feeding speed of the release paper and the pulling speed of the rubber sheet may be adjusted to this.
In the above, a description has been given of a case where the release paper with a grain is transferred to one side, but the release paper with a grain may be transferred to both sides in the same manner. FIG. 2 shows a schematic diagram of the manufacturing method in this case. In this case, after being transferred to the release paper 81 sent from the guide roll 61 between the rolls 30 and 40, the roll is further transferred between the rolls 40 and 50 to the rubber surface where the release paper is not transferred. The release paper 82 sent from 62 is transferred. The cross section of the ultra-thin rubber sheet thus obtained is as shown in FIG. 4, and an ultra-thin rubber sheet with a double-sided embossment is obtained.
[0010]
[Action]
In the present invention, when obtaining an ultra-thin rubber sheet by calendering using a release paper, a release paper with a texture is used instead of a smooth release paper. Conventional release papers have a smooth surface and poor adhesion to rubber, so they are taken up by rolls and wrapped around, and floating between the rubber and release paper, air load, and air entrainment in rubber are unavoidable, and drawers cannot be pulled out. It was not smooth. However, in the present invention, since the release paper with a grain is used, the close contact with the rubber is improved, and all of the above problems are solved. Furthermore, since an uneven pattern is formed on the rubber surface, an extremely thin rubber sheet having a good finished appearance and feel can be obtained.
[0011]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples.
Example 1
In the step shown in FIG. 1, an ultrathin rubber sheet with a single-sided crimp was manufactured using the kneaded CR rubber. The gap between the rolls 10 and 20 was set to 0.12 mm, the gap between the rolls 20 and 30 was set to 0.10 mm, and the gap between the rolls 30 and 40 was set to 0.08 mm so that the rubber thickness of the roll 40 became 0.08 mm. The gap between the rolls 40 and 50 was 0.22 mm.
[0012]
The kneaded CR rubber 70 was passed through the rolls 10 to 40, gradually rolled, and transferred to the release paper sent from the guide roll 60 between the rolls 40 and 50. The thickness of the release paper was 0.15 mm, and the depth of the texture was 0.02 mm.
The ultra-thin sheet obtained in this manner was wound while being bonded to release paper. This was rolled and vulcanized at 130 ° C. to 150 ° C. for 3 hours to obtain an ultrathin rubber sheet with a single-sided embossed surface. The rubber sheet may be used after releasing the release paper at the time of use.
[0013]
Example 2
In the process shown in FIG. 2, a kneaded CR rubber was used to produce an ultrathin rubber sheet with double-sided embossments. The gap between the rolls 10 and 20 was set to 0.10 mm and the gap between the rolls 20 and 30 was set to 0.08 mm so that the rubber thickness of the roll 30 became 0.08 mm. The gap between the rolls 30 and 40 was 0.22 mm, and the gap between the rolls 40 and 50 was 0.36 mm.
The kneaded CR rubber 70 is passed through the rolls 10 to 30, rolled gradually, and transferred to the release paper 81 sent from the guide roll 61 between the rolls 30 and 40. The release paper 82 sent from the guide roll 62 and the rubber surface without the release paper were transferred to each other. The same release paper as that used in Example 1 was used. The ultra-thin sheet obtained in this manner was wound while being bonded to release paper. This was rolled and vulcanized in the same manner as in Example 1 to obtain an ultrathin rubber sheet with double-sided embossments.
[0014]
【The invention's effect】
According to the production method of the present invention, when obtaining an ultra-thin rubber sheet by calendering using release paper, winding around a roll, floating or air loading between rubber and release paper, and preventing occurrence of air entrainment in rubber. And the drawer became easy. In addition, since a concave-convex pattern is formed on the rubber surface, a sheet having a good finished appearance and feel can be obtained.
[Brief description of the drawings]
FIG. 1 is a process schematic diagram showing one example of a production method of the present invention.
FIG. 2 is a schematic process diagram showing an example of another manufacturing method of the present invention.
FIG. 3 is a cross-sectional view of an ultrathin rubber sheet with a single-sided grain obtained by the production method of the present invention.
FIG. 4 is a cross-sectional view of an ultra-thin rubber sheet with a double-sided grain obtained by the production method of the present invention.
[Explanation of symbols]
70 Rubber 80 Release paper

Claims (1)

The kneaded rubber is rolled by calendering to form a rubber sheet, and then the rubber sheet is transferred between rolls onto a release paper with a grain having a grain depth of 0.005 mm to 0.3 mm, and then drawn out. And vulcanizing by pin vulcanization or roll steaming.

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