JPH0351575B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention enables easy production of a long laminated sheet in which dissimilar materials such as rubber, metal, synthetic resin, and fibers are continuously vulcanized and bonded. The present invention relates to a continuous vulcanization method for rubber and dissimilar materials, and particularly to a method suitable when the rubber layer of a laminated sheet is thin.

(Prior art) Conventionally, as a method for vulcanizing and adhering rubber to a thin metal plate, etc., there has been a method in which a metal plate, etc. that has undergone adhesive treatment and unvulcanized rubber are laminated and press vulcanization is performed using a press mold. Although this is well known, since a mold is used, it is not possible to produce short laminated sheets of a fixed length.

Therefore, the well-known continuous vulcanization of rubber sheets has been proposed as a method that makes it possible to manufacture a laminated sheet of infinite length by vulcanizing and bonding metal plates, etc. and rubber, and also allows the vulcanization bonding process to be carried out continuously and efficiently. It has been proposed to use a funnel cure, which is a sulfurization device.

That is, Special Publication No. 35-4340 and Special Publication No. 40-5204.
The present invention attempts to manufacture a long laminated sheet in which an unvulcanized rubber sheet and a sheet of different materials are laminated and vulcanized and bonded using a rotocure having a well-known structure as disclosed in the above publication.

(Problems to be Solved by the Invention) However, when using roto-cure, if the use of the laminated sheet requires a thin rubber layer, roto-cure a thin unvulcanized rubber sheet. However, there is a problem that the unvulcanized rubber sheet is torn or cut and cannot be manufactured into a product.

Therefore, in the case of unvulcanized rubber sheets that are thin and difficult to supply alone, unvulcanized rubber is attached to a base material such as a cloth sheet or resin sheet that has been adhesively treated by topping or friction. However, it is conceivable to hold the unvulcanized rubber sheet on the base material and feed it into the roto cure, but in this case, the cloth sheet etc. will remain as part of the laminated sheet product, making it difficult to manufacture the product with only the desired material. In addition to being inconvenient in that it cannot be formed, there are also problems in that it is impossible to reuse the cloth sheet, etc., and it is not economically viable.

(Means for Solving the Problems) The present invention aims to solve the above problems, and aims at simultaneously disposing a thin unvulcanized rubber sheet and a belt-shaped material different from rubber while facing each other. It is supplied between the main drum of the rotocure and the endless steel belt, and the two are laminated on the circumferential surface of the main drum while being pressurized and heated to vulcanize the unvulcanized rubber sheet and simultaneously vulcanize and bond it to the band-shaped material. In this continuous vulcanization adhesion method of rubber and different materials, the unvulcanized rubber sheet is supplied to the roto cure in a state in which it is adhesively fixed on a holding sheet to which no adhesive is applied, and The means is that the holding sheet is peeled off from the rubber sheet after sulfurization.

(Function) In the present invention, since the holding sheet used to send the thin unvulcanized rubber sheet to the funnel curer is removed from the rubber sheet after vulcanization, only the thin rubber layer and the foreign material can be separated. In addition to being able to obtain a product composed of the following, the holding sheet can be used repeatedly for the same purpose.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

In FIG. 1, A is a rotary curer used to carry out the method of the present invention, which includes a heated main drum 1, two auxiliary drums 2 and 3 placed close to the outer periphery of the main drum 1, and the outer periphery of the main drum 1. It consists of a tension drum 4 that tensions an endless steel belt 5 that runs while pressing against the surface, and the auxiliary drum 2 is driven and rotated by a transmission device (not shown).
As the endless steel belt 5 runs, the main drum 1, auxiliary drum 3, and tension drum 4 also rotate accordingly.

To explain the process of using this rotocure to obtain a laminated sheet in which only a thin unvulcanized rubber sheet is vulcanized and bonded to a different material, the first step is to create a laminated sheet by vulcanizing and adhering only a thin unvulcanized rubber sheet to a different material. A thin unvulcanized rubber sheet 6 is placed on a holding sheet 8 consisting of
is added by topping etc. and fixed by the adhesive force of unvulcanized rubber, and then it is attached to aluminum foil, metal plate such as thin iron plate, Teflon (recorded trademark ), etc., or a fiber sheet such as cloth (see FIG. 2a), and is fed between the main drum 1 and the endless steel belt 5 of the roto cure A.

Then, the unvulcanized rubber sheet 6 with the holding sheet 8 adhesively fixed to one side 6a and the foreign material 7 are sandwiched between the main drum 1 and the endless steel belt 5, and are stacked on the outer peripheral surface of the main drum 1. Since the unvulcanized rubber sheet 6 is fed in the direction of rotation 1 and heated and pressurized during this rotation, the unvulcanized rubber sheet 6 is vulcanized and simultaneously vulcanized and adhered to the dissimilar material 7.

Thereafter, the vulcanized rubber sheet 6' and the foreign material 7 are hung around the outer periphery of the auxiliary drum 2 and rolled up on the tension roll 4 side. Since the former 8 is not vulcanized and bonded to the latter 6', the former 8 can be easily peeled off from the latter 6' (see Fig. 2b) to obtain a laminated sheet B consisting only of a thin vulcanized rubber sheet 6' and a different material 7. (See Figure 2c). In addition, the material of the rubber sheet 6 to be vulcanized and bonded to the foreign material 7 is
Known synthetic rubbers and natural rubbers such as SBR, CR, NBR, and silicone rubber can be used, and the adhesive used for vulcanization can be arbitrarily selected from known ones. Thin unvulcanized rubber sheet 6 to be fed between
It goes without saying that either of the belt-shaped foreign material 7 and the belt-shaped foreign material 7 may be placed on the main drum side.

(Effects of the Invention) According to the present invention, a long laminated sheet consisting only of a thin rubber layer and a layer of different materials can be efficiently manufactured, and the holding sheet peeled off from the laminated sheet can be reused. This makes it possible to save resources and reduce manufacturing costs.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the method of the present invention, and FIG. 2 is a partial sectional view showing the implementation steps. A...Rotocure, B...Laminated sheet, 1...
... Main drum, 5 ... Steel belt, 6 ... Unvulcanized rubber sheet, 7 ... Band-shaped heterogeneous material, 8 ... Holding sheet.

Claims (1)

[Claims] 1. A thin unvulcanized rubber sheet and a belt-shaped material different from rubber are fed simultaneously between the main drum of a roto cure and an endless steel belt while facing each other, and both are placed on the circumferential surface of the main drum. In this method, the unvulcanized rubber sheet is laminated and heated under pressure, and the unvulcanized rubber sheet is simultaneously vulcanized and bonded to the strip material, and the unvulcanized rubber sheet is coated with an adhesive. A method for continuously vulcanizing and adhering rubber and dissimilar materials, characterized in that the rubber is supplied to the rotocure in a state where it is adhesively fixed on a holding sheet, and the holding sheet is peeled off from the rubber sheet after vulcanization. 2. The method according to claim 1, wherein the foreign material is metal. 3. The method according to claim 1, wherein the foreign material is a synthetic resin. 4. The method according to claim 1, wherein the foreign material is fiber.