JP2558848Y2 - Liner cloth for wet heat vulcanization - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liner cloth for wet heat vulcanization, and more particularly to an improvement of a liner cloth for wet heat vulcanization used for vulcanizing a long rubber sheet having a drawn pattern on its surface.

[0002]

2. Description of the Related Art Conventionally, when forming a long rubber sheet having a drawn pattern on the surface, a liner cloth for wet heat vulcanization consisting of a band-like woven cloth wider than a target product is used, and the liner cloth between the belt-like cloths is used. An unvulcanized rubber sheet is inserted and wound, and this is set in a vulcanizing can and wet-heat vulcanized with steam.At that time, the texture of the woven fabric is pressed on the rubber sheet surface, and then the steam is released and cooled. Is manufactured by a process of releasing, and taking out and rewinding.

[0003] The liner cloth for wet heat vulcanization used in this case has the purpose of forming a drawn pattern on the surface of a rubber sheet as a product, the purpose of a separator that does not allow unvulcanized rubber to adhere to each other during vulcanization, and It has the purpose of improving the conduction of the moist heat to the inner rubber portion. Therefore, the properties of the liner cloth for wet heat vulcanization are required to be free of fluff, have moisture and heat resistance, and have a certain level of water absorption and good water diffusion. For this purpose,
Conventionally, a woven fabric made of rayon fiber has been suitably used as a liner cloth for vulcanization under wet heat.

[0004]

However, the liner cloth for wet heat vulcanization must function as a separator and must be a band-shaped woven cloth wider than an unvulcanized rubber sheet. There is a drawback that the wide ears of the woven fabric tend to tear. The cause is that when set and vulcanized in a can, the portion of the liner cloth for wet heat vulcanization that is laminated with the rubber sheet is slowly affected by the moist heat, while the two ears exposed into the can It is considered that the part is directly affected by the moist heat and the deterioration progresses remarkably only in the both ears. Was broken and could not be used.

[0005] However, in order to solve the above problem, it is sufficient to weave the liner cloth for wet heat vulcanization with a cotton yarn having excellent wet heat resistance. However, when the cotton yarn is used, fluff and cotton seeds are transferred and adhered to the rubber sheet surface. There is a disadvantage that it is difficult to obtain high-value products. Also, filaments other than rayon, for example 6,6
In the case of a nylon filament, there is no fuzz or the like, but there is a drawback that the wet heat shrinkage is large, it is difficult to use repeatedly, and there is no cold setting effect. Polyamide fiber is extremely excellent in moist heat resistance without generation of fluff,
Although it is the most preferable in terms of function, it is very expensive, so that there is a problem that it is uneconomical to return as a material of a liner cloth for wet heat vulcanization used as a consumable.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention has no fuzz and can reliably form a squeezed pattern, can also prevent breakage of both ears, and has a long service life. The purpose of the present invention is to obtain a long and inexpensive liner cloth for vulcanizing with wet heat.

[0007]

In other words, the liner cloth for wet heat vulcanization of the present invention is wound by inserting an unvulcanized rubber sheet between belt-like woven fabrics made of heat-resistant fibers, and then wet-heated with a vulcanizer. In a liner cloth for wet heat vulcanization used when vulcanizing to produce a belt-shaped rubber sheet, the weft along the width direction of the liner cloth is a multifilament made of rayon,
The warp yarns along the length direction of both width edges that do not contact the unvulcanized rubber sheet are cotton yarns, the other warp yarns in the central band portion are multifilaments made of rayon, and the thickness of the cotton yarn is multifilament made of synthetic resin. It is characterized in that the thickness is equal to the thickness of the filament to 70%.

[0008]

In the present invention, the liner cloth for wet heat vulcanization has synthetic fiber filaments, such as rayon fibers, which have no fluff in the central band portion in contact with the unvulcanized rubber sheet. Then, only the both ears affected by wet heat are woven as a cotton yarn having excellent wet heat resistance. Due to the hygroscopicity of cotton, at the end of vulcanization, the cold setting effect due to the quenching effect due to the heat of evaporation is large. Therefore, the effect of wet heat during vulcanization is slow and less deteriorated in the portion laminated with the rubber sheet, and the binaural portion is made of fibers that are not easily affected by wet heat even if it is directly affected by heat. As a result, deterioration fracture is effectively prevented. The reason why the thickness of the warp in both ears is made to be as thin as 70% of the thickness of the warp in the center band is because the thickness of both ears is thicker than that of the center band, so-called "ear suspension". This is to prevent "".

Next, an embodiment of the present invention will be described. FIG.
FIG. 2 is a plan view of an embodiment of the present invention, and FIG. 2 is a sectional view taken along line AA of FIG.

Example 1 In weaving a liner cloth 1 for vulcanization under wet heat, Table 1
Using the multifilament shown in the above, a liner cloth for wet heat vulcanization 1 was woven by plain weaving. The ear tissue of the woven fabric was a loop ear or a rapier ear.

[0011]

[Table 1]

Example 2 The same fiber as in Example 1 was used, and a liner cloth 1 for wet heat vulcanization was woven in the same manner as in Example 1 under the conditions shown in Table 2 for the use of yarn, the number of threads to be driven, and the number of twists. .

[0013]

[Table 2]

Example 3 A liner cloth for wet heat vulcanization 1 was woven in the same manner as in Example 1 except that an aromatic polyamide fiber was used instead of the cotton yarn of Example 1.

[0015]

[Table 3]

The width of the liner cloth 1 for wet heat vulcanization in Examples 1 to 3 is such that the width of the central band A is 1.045 times the width of the rubber sheet G, that is, the width of the rubber sheet G is 1150 mm.
1202mm, the width of the binaural band B, considering the margin of one ear part,
As in the case of the central band A, it was multiplied by 1.045 to make a total of 63 mm for both 31.5 mm ears, thereby forming a band-shaped woven fabric having a total width of 1265 mm.

When the rubber sheets of Examples 1 to 3 were subjected to wet heat vulcanization, there were no abnormalities in all of them up to the fourth use, and tearing of the ears occurred from the fifth time. As a comparative example, in the case of rayon for both the warp and the weft, the ear breaks from the second time, and the liner cloth 1 for wet heat vulcanization of the present invention is applied.
The durability was found.

[0018]

According to the present invention, as described above, fluff and the like do not adhere to the rubber sheet during wet heat vulcanization, and the repetitive service life can be almost doubled. Further, since the liner cloth 1 for wet heat vulcanization of the present invention uses a material having good water absorbability, it is excellent in cold setting effect after opening the vulcanization can, and can produce a high quality rubber sheet. Has a positive effect.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line AA of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Liner cloth for wet heat vulcanization 2 ... Weft 3A ... Central band warp 3B ... Binaural warp

Claims (1)

(57) [Scope of request for utility model registration] 1. An unvulcanized rubber sheet is interposed and wound between belt-shaped woven fabrics made of heat-resistant fibers, and then heated and vulcanized in a vulcanizing can to produce a heat-vulcanized rubber sheet. In a liner cloth for vulcanization, the weft along the width direction of the liner cloth is a multifilament made of rayon, the warp along the length direction of both width edges not in contact with the unvulcanized rubber sheet is cotton yarn, and the other central band. A liner cloth for wet heat vulcanization, characterized in that a part of the warp is made of rayon multifilament, and the thickness of the cotton yarn is made equal to the thickness of the rayon multifilament to 70%.