JPH074882B2 - Manufacturing method of rubber tube with surface pattern - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber tube used for making a rubber roller by attaching to a core bar.
The present invention relates to a method for producing a product having an uneven pattern on the surface.

[0002]

2. Description of the Related Art A surface roller of a loom winds a woven fabric on the loom with high tension. Wrap it in a circle without any gaps and attach it with an adhesive,
Furthermore, it is made with screws at the ends. However,
This method of winding the rubber strip requires a tight winding so that there is no gap between the coil of the rubber strip wound in a spiral shape and the adjacent portion of the coil when winding, which is troublesome and requires skill. If too much adhesive is applied to the core metal, the adhesive will squeeze out from the adjacent portion of the coil, and if it is too small, the rubber strip will easily peel off, and there will be gaps in the adjacent portion of the rubber strip during use. was there.

In order to solve this problem, it has been attempted to cover the core metal of the winding roller such as the surface roller with a rubber tube and fix it with an adhesive or heat shrinkage. Then, as a method for producing a rubber tube having an uneven pattern on the surface, on the surface of the rubber tube extruded from the extruder, a plurality of molding rollers arranged in a ring shape at the exit of the extruder are pressed to contact the rubber. A method has been proposed in which a concavo-convex pattern is formed on the surface of a tube, and then the tube is introduced into a vulcanization chamber and vulcanized (see Japanese Patent Publication No. 3-178423).

[0004]

However, in the above method, a large number of embossing rollers having curved outer peripheral surfaces are arranged in a ring shape, and the inner surface of the ring forms a circle. When the patterning roller is rotated at the same rotation speed, the peripheral speed of the central part becomes larger than that of the end part of the patterning roller and the surface of the rubber tube slips with respect to the patterning roller. Along with the axial streaks on the rubber tube, the uneven shape transferred from the molding roller to the rubber tube is destroyed, and since the above rubber tube is heated after leaving the molding roller, it is transferred to the rubber tube. There was a problem that the unevenness was broken by the above heating and the corners and corners were rounded.

The present invention relates to woven fabric, knitted fabric, yarn, sliver,
It is possible to manufacture a rubber tube with a pattern for attaching to the core of a rubber roller used for winding and sending out textile products such as tows and films, and to accurately measure the uneven pattern of the matrix with rubber. It is designed so that it can be transferred to the surface of the tube.

[0006]

Means for Solving the Problems With the surface pattern of the present invention
The manufacturing method of the rubber tube is a cylindrical shape with an uneven pattern on the inner surface.
Close the unvulcanized rubber tube inside the rubber matrix.
And vulcanize the rubber tube in this close contact stateThings
And includes a first means and a second means described below.
It

The rubber used in the rubber tube with the above surface pattern is NBR, a mixture of NBR and PVC, CR,
It is a rubber such as NR, SBR, IR, IIR or urethane, or a mixture of these rubbers and a resin, and its hardness after vulcanization is preferably 50 to 90 degrees of JIS-A rubber hardness. The rubber used for the cylindrical rubber matrix is preferably heat resistant rubber such as butyl rubber, silicon rubber, SEP, EPDM and fluororubber, and a mixture of these heat resistant rubbers with short fibers.

The first means is to coat an unvulcanized rubber tube on a core metal, and to form a rubber tape for a mother die having an uneven pattern on the surface and lined with a reinforcing cloth on the rubber tube. Wrap it in a spiral shape with no gaps and with the surface facing downward, and then wrap a wrapping material from above and tighten it to form a cylindrical rubber matrix, and at the same time
Inside the cylindrical rubber matrix of the above unvulcanized rubber
Put the tubes into close contact and add the rubber tube in this close contact state.
It characterized by vulcanization.

The second means is to wind a mother die rubber tape having an uneven pattern on the surface and backed with a reinforcing cloth in a spiral shape around the core metal with no gaps and with the surface facing upward.
An unvulcanized rubber tube for a master block is adhered on it, and a wrapping material is further wound and tightened on it to form a cylindrical rubber matrix, which is then molded. the Jo rubber matrix was fixed to the inside of the outer mold, and insert the unvulcanized rubber tubing inside the <br/> cylindrical rubber matrix, the rubber tube pressurized to an air bag inserted into the inside It is adhered to the inside of the cylindrical rubber matrix by supplying air, the contact state
In you characterized by vulcanizing the rubber tube.

The above rubber tape for master mold has a thickness of 1.5 to 2.0 mm and a width of 38 as in the conventional rubber strip.
It is a rubber tape of about 50 mm and can be manufactured as follows. That is, an adhesive is applied to one side of a wide reinforcing cloth having a width of several tens of times the width of the rubber strip, and an unvulcanized rubber sheet (a cylindrical rubber matrix with a rubber tape for a mother die is applied to the adhesive-coated surface). When molding, it is preferable to use the above-mentioned heat-resistant rubber etc. as the rubber.), Put this laminated sheet on the conveyor so that the rubber surface faces upward, and intermittently forward feed it, then stop Sometimes sand paper, deep woven fabric or any other template is placed on the rubber surface, and these are sandwiched between hot plates to transfer the surface irregularities of the template to the rubber surface and vulcanize, and then the wide width,
It is made by slitting a long overlapping sheet.

[0011]

[Function] Since the unvulcanized rubber tube is adhered to the inside of the cylindrical rubber matrix and the rubber tube is vulcanized in this adhered state, the uneven pattern on the inner surface of the cylindrical rubber matrix is formed on the surface of the rubber tube. Accurately transferred and vulcanized, a rubber tube having the same concavo-convex pattern as the matrix on the surface is obtained.

In particular, by coating the above-mentioned rubber tube on a core metal,
When the matrix rubber tape is wound on top of this and the above cylindrical rubber matrix is directly molded, the manufacturing process of the cylindrical rubber matrix is shortened. Then, in this case, after the vulcanization is completed, the wrapping material and the rubber tape for a mother die forming the cylindrical rubber matrix are sequentially unwound, and the patterned rubber tube of the product is taken out. Moreover, since the mother die rubber tape is lined with the reinforcing cloth, the mother die rubber tape can be wound with a uniform tension.

Also, the above-mentioned rubber tape for master mold is wrapped around the surface of the core metal, a rubber tube for master mold is adhered on it, and vulcanized to form a cylindrical rubber matrix, which is used as an outer mold. If it is fixed inside, and an unvulcanized rubber tube is inserted into the inner surface of this cylindrical rubber matrix and adhered with an air bag, the manufacturing process of the cylindrical rubber matrix will increase, but the cylindrical rubber matrix It becomes easy to attach the unvulcanized rubber tube to the matrix. And in this case,
After the vulcanization, the patterned rubber tube of the product is taken out by shrinking the airbag, and the cylindrical rubber matrix can be reused as it is.

[0014]

【Example】

Example 1 In FIG. 1, 10 is a core metal having a diameter of 110 mm, and an unvulcanized rubber tube 11 made of NBR is adhered to the core metal 10 while inflating with air, and a fluororesin-based mold release is applied to the surface thereof. The agent was spray applied and dried. Next, a rubber strip for a surface roller of a loom made of natural rubber lined with a reinforcing cloth made of cotton fibers (thickness 2.0 mm, width 3
8 mm) is used for the mother die rubber tape 12, and the mother die rubber tape 12 is wound around the above rubber tube in a spiral shape with no gaps, with a width of 50 mm as a wrapping material. Cloth tape of 7-8
It was wound with a tension of kg and tightly tightened, and steam vulcanization was performed for 30 minutes at 164 ° C. using a vulcanizer device. And
After vulcanization, cloth tape and rubber tape for master 1
2 was sequentially solved, and the uneven pattern of the rubber tape 12 for master block was transferred, and the vulcanized rubber tube 11 having a JIS-A rubber hardness of 65 degrees was taken out from the core metal 10.

Example 2 Referring to FIG. 2, a core metal 20 similar to the core metal 10 used in the above-described Example 1 was used, and a mother die rubber tape 2 similar to that of Example 1 was used.
No. 1 was spirally wound with no gaps so that the uneven pattern on the surface thereof faced upward, and was evenly wound and bonded with an adhesive. Both ends were fixed with cloth tape so as not to loosen. Next, a silicone resin-based mold release agent is applied to the surface of the rubber tape 21 by spraying and dried, and then the unvulcanized rubber tube for master block 2 made of silicone rubber.
2 while inflating it with air, and a polyester film tape (wrapping material) with a width of 50 mm on it 7 ~
Wrap and fix with a tension of 8 kg. And put it in the vulcanization can,
Vulcanize using high temperature steam at 164 ° C for 30 minutes,
Thereafter, the above tape is removed, and the vulcanized rubber tube for matrix (cylindrical rubber matrix) 22 is taken out.

Next, an unvulcanized rubber tube 23 previously molded by NBR is inserted into the inside of the vulcanized mother rubber tube 22 (cylindrical rubber matrix), and an air bag is further inside thereof. 24, and these three members are put together into a pipe-shaped outer mold 25, and then air having a pressure of 5 kg / cm ² is introduced into the above-mentioned airbag 24 so that the rubber tube 23 and the mother-mold rubber tube 22 are inserted. It is inflated in order and the rubber tube for mother die 22 is brought into close contact with the outer die 25. Then, using a vulcanizer, heating was performed at 164 ° C. for 30 minutes to obtain a target rubber tube 23 to which the uneven pattern of the inner surface of the mother rubber tube 22 was transferred.

[0017]

As described above, according to the present invention,
An unvulcanized rubber tube is brought into close contact with the inside of a cylindrical rubber matrix having an uneven surface on the inner surface, and the rubber tube is vulcanized in this close contact state, so that a rubber tube having an uneven surface is obtained. Then, this rubber tube with a pattern can be easily fixed by being attached to the core metal of various rubber rollers such as a feeding roller and a winding roller of a textile machine, and thermally shrinking or applying an adhesive. . Moreover, since the unvulcanized rubber tube is vulcanized while being closely adhered to the inside of the cylindrical rubber matrix, the uneven pattern inside the cylindrical rubber matrix is accurately transferred to the rubber tube.

The invention described in claim 1 is
The unvulcanized rubber tube is adhered to a core metal, and a rubber tape for a master is wound on the core metal to form a cylindrical rubber matrix, so that a cylindrical rubber matrix is produced. The process is shortened. Moreover, since the matrix rubber tape is lined with a reinforcing cloth, it can be wound with a strong and uniform tension to form a cylindrical rubber matrix.

Further, in the invention of claim 2 , the rubber tape for mother die is wound around the surface of the core metal so that the surface faces upward, and the rubber tube for mother die is adhered on it and vulcanized. A cylindrical rubber matrix is formed by fixing it inside the outer mold, inserting an unvulcanized rubber tube into the inner surface of this cylindrical rubber matrix, and adhering it with an air bag. It becomes easy to attach the unvulcanized rubber tube to and remove the vulcanized rubber tube. In this case, since the transfer is performed twice, a rubber tube with a pattern having exactly the same unevenness as the rubber tape for mother mold can be obtained.

[Brief description of drawings]

FIG. 1 is a front view of a cored bar used in Example 1. FIG.

FIG. 2 is a cross-sectional view of a cored bar used in Example 2.

FIG. 3 is a cross-sectional view of an airbag mounting example of the second embodiment.

[Explanation of symbols]

 10: core metal 11: unvulcanized rubber tube 12: rubber tape for mother die 20: core metal 21: rubber tape for mother die 22: rubber tube for mother die 23: unvulcanized rubber tube 24: airbag 25: outside Type

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Claims (2)

[Claims] 1. A core metal covered with an unvulcanized rubber tube,
On the rubber tube of the
Lined rubber tape for mother mold in a spiral shape without gaps,
And wrap it with the surface facing downward, and then wrap it from above.
Cylindrical rubber mat by winding and tightening
Helix is formed, at the same time the inside of the cylindrical rubber matrix are brought into close contact with the unvulcanized rubber tubing, preparation of textured rubber tube, characterized in that vulcanizing rubber tube in this close contact state. Wherein the rubber tape for matrix lined with reinforcing fabric has an uneven pattern on the front surface to the core surface without gap spiral and winding with its front surface upper direction, unvulcanized thereon of
Cylindrical rubber is obtained by applying a rubber tube for a mother die , winding a wrapping material on it, tightening it, and vulcanizing it.
A matrix made of rubber, and then this cylindrical rubber mat
Helix were fixed to the inside of the outer mold, and insert the unvulcanized rubber tubing inside the cylindrical rubber matrix, the
Press the rubber tube to the airbag inserted inside.
The cylindrical rubber matrix is supplied by supplying air.
The rubber tube inside the box.
Preparation of textured rubber tube characterized by vulcanization.