JPH0562588U - Wet heat vulcanization liner cloth - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to extend the service life of a liner cloth for moist heat vulcanization that has no fuzz and has a drawn pattern. [Structure] For moist heat vulcanization used when manufacturing a band rubber sheet by inserting an unvulcanized rubber sheet between wound woven fabrics made of heat resistant fibers and winding it, and then vulcanizing it with heat and vulcanization In the liner cloth, the weft yarns 2 along the width direction of the liner cloth are rayon multifilaments, the warp yarns 3B along the length direction of both width edges that do not contact the unvulcanized rubber sheet are cotton yarns, and the other central belts. The warp 3A of the part is made of rayon multifilament, and the thickness of the cotton yarn is made to be equal to the thickness of rayon multifilament to 70% of the thickness, and the ear tear is prevented by the constituent fibers of both ears. To do.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a liner cloth for wet heat vulcanization, and more particularly to improvement of a liner cloth for wet heat vulcanization used when vulcanizing and molding a long rubber sheet with a drawing pattern on the surface.

[0002]

[Prior Art]

 Conventionally, when molding a long rubber sheet with a squeezing pattern on the surface, a liner cloth for moist heat vulcanization consisting of a band-shaped woven fabric that is wider than the target product is used, and the unvulcanized rubber sheet is placed between the band-shaped woven fabrics. And wrap it, set it in a vulcanization can, and heat-moisture vulcanize it with steam.At that time, the texture of the woven fabric is pressed on the surface of the rubber sheet, and then the can is opened by steam cooling to open and take it out. Manufacturing is performed by the process of rewinding.

The liner cloth for wet heat vulcanization used in this case is used not only for the purpose of forming a drawing pattern on the surface of the rubber sheet to be the product, but also as a separator for preventing unvulcanized rubber from adhering to each other during vulcanization. , And the purpose of improving the conduction of moist heat to the rubber inner wall portion. Therefore, the properties of the liner cloth for wet heat vulcanization are required to have properties such as no fluff, resistance to wet heat, and a certain degree of water absorption and good moisture wicking property. For this purpose, conventionally, a woven fabric made of rayon fibers has been suitably used as a liner cloth for wet heat vulcanization.

[0004]

[Problems of conventional technology]

 However, the liner cloth for wet heat vulcanization needs to function as a separator, so it is necessary to make it a band-shaped woven fabric that is wider than the unvulcanized rubber sheet. There was a drawback that tearing of the ears was likely to occur. The reason for this is that when set and vulcanized in the can, the portion of the liner cloth for wet heat vulcanization that is laminated with the rubber sheet is less affected by the heat of heat, whereas both ears exposed inside the can are exposed. It is considered that the part is directly affected by the moist heat, and the deterioration progresses significantly only in both ears. In fact, the conventional rayon liner cloth for wet heat vulcanization made of rayon described above is used in both ears 2 to 3 times. The part was torn and was unusable.

However, in order to solve the above problems, a liner cloth for wet heat vulcanization may be woven with cotton yarn having excellent resistance to moisture and heat. However, when cotton yarn is used, fluff and cottonseed are transferred and attached to the rubber sheet surface. There is a drawback that high value products are difficult to obtain. Further, in the case of filaments other than rayon, for example, 6,6 nylon filaments, there are drawbacks in that they do not generate fluff, but have large wet heat shrinkage, making repeated use difficult and having no cold set effect. Polyamide fiber is the most functionally preferable because it does not cause fluff and has excellent resistance to moist heat, but it is extremely expensive, so it is a material for a liner cloth for wet heat vulcanization that is used as a consumable item. There was a problem that returned and became uneconomical.

[0006]

[Problems to be solved by the device]

 In consideration of the above problems, the present invention is capable of reliably attaching a squeezing pattern without fluff adherence, and also capable of satisfactorily preventing breakage of both ears, and thus has a long service life and may be inexpensive moist heat treatment. It was made for the purpose of obtaining a liner cloth for sulfurization.

[0007]

[Means for Solving the Problems]

 That is, the liner cloth for wet heat vulcanization of the present invention is manufactured by inserting a non-vulcanized rubber sheet between a band-shaped woven fabric made of heat-resistant fiber and winding it, and vulcanizing it with heat and heat to produce a band-shaped rubber sheet. In a liner cloth for wet heat vulcanization used in the case of a liner cloth, the weft threads along the width direction of the liner cloth are made of rayon multifilament, and the warp threads along the length direction of both width edges that do not contact the unvulcanized rubber sheet. Is a cotton yarn, and the other warp yarns in the central zone are rayon multifilaments, and the thickness of the cotton yarn is equal to that of the synthetic resin multifilament to 70%. It is a sipping thing.

[0008]

[Action]

 In this invention, the liner cloth for wet heat vulcanization has a fluff-free synthetic fiber filament such as rayon fiber in the central band portion which comes into contact with the unvulcanized rubber sheet. Then, only the two ears affected by the heat and humidity are woven as cotton threads with excellent resistance to heat and humidity. Due to the hygroscopicity of cotton, the cold-setting effect is large due to the quenching effect due to the heat of evaporation at the end of vulcanization. Therefore, the effect of wet heat during vulcanization is that the part laminated with the rubber sheet has a slow effect and little deterioration, and both ears have fibers that are not easily affected by the direct effect of wet heat. As such, deterioration tearing is effectively prevented. The reason why the thickness of the warp yarns in both ears is as thin as 70% of the warp yarn in the central band is because the thickness of both ears is thicker than that in the central band. This is to prevent

Next, an embodiment of this invention will be described. 1 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 the liner cloth 1 for wet heat vulcanization, the multifilament shown in Table 1 was used to weave the liner cloth 1 for wet heat vulcanization by plain weaving. The tissue of the ears of the woven cloth was loop ears or rapier ears.

[0011]

[Table 1]

Example 2 The same fiber as in Example 1 was used, and the liner cloth 1 for wet heat vulcanization was woven in the same manner as in Example 1 under the conditions that the thread usage, the number of threads, and the number of twists are shown in Table 2. It was

[0013]

[Table 2]

Example 3 A liner cloth 1 for wet heat vulcanization was woven in the same manner as in Example 1 except that the 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 was 1150 mm for the width of the rubber sheet G, and the width of the central belt A was 1.045 times the width of the rubber sheet G, that is, 1202 mm. Considering the margin of one ear, the width of both ears B was multiplied by 1.045 as in the case of center sash A to make a total width of 1265 mm with a total width of 1265 mm.

When the moist heat vulcanization of the rubber sheets was carried out in each of Examples 1 to 3, there was no abnormality until repeated use 4 times, and tearing of the ears occurred from the 5th time. As a comparative example, when both warp and weft were made of rayon, tearing of the ears occurred from the second time, and the durability of the liner cloth 1 for wet heat vulcanization of the present invention was found.

[0018]

[Effect of the device]

 As described above, this invention has no fluffs attached to the rubber sheet during wet heat vulcanization, and has a repeated service life almost double that of the conventional one. Further, since the liner cloth 1 for wet heat vulcanization of the present invention uses a material having a good water absorption property, it has an excellent cold setting effect after opening the vulcanization can and can be used in various practical applications such as the production of a good quality rubber sheet. Have a physical effect.

[Brief description of drawings]

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

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

[Explanation of symbols]

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

Claims (1)

[Scope of utility model registration request] 1. A moist-heat vulcanizer used for producing a band-shaped rubber sheet by inserting an unvulcanized rubber sheet between a band-shaped woven fabric made of heat-resistant fibers, winding the uncured rubber sheet, and vulcanizing it with a vulcanizer. In the liner cloth for vulcanization, the weft yarns in the width direction of the liner cloth are rayon multifilaments, the warp yarns in the width direction of both width edges that do not contact the unvulcanized rubber sheet are cotton yarns, and the other central belts. 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 thread is equal to that of rayon multifilament to 70%.