JPS58147336A - Elastomeric product and manufacture thereof - Google Patents

Abstract

PURPOSE:To manufacture an elastomeric product, especially a solid tyre being excellent in durability, through a simplified process, by using a fiber cord-reinforced layer consisting of refrigerated fragments of an unvulcanized rubber fiber cord material. CONSTITUTION:An unvulcanized casing scrap 4, such as nylon, rayon, is refrigerated and crushed at lower than about -50 deg.C, and the obtained fragments are charged in an open roll 5 heated to about 60-80 deg.C to produce a sheet having a required thickness and width. Meanwhile, a raw material for tread rubber is extrusion-molded into a required cross section configuration by a conventional method using an extruder. A calendared sheet of said fiber cord is then wound around a molding former 6 to form a fiber cord layer 2, a tread rubber sheet is wound therearound to form a tread rubber layer 3, and the work is then vulcanization-finished by a vulcanizing press 7 to manufacture a solid tyre.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in elastomeric articles, particularly solid tires and methods of manufacturing the same.

Conventionally, for solid tires, such as pneumatic type solid tires, unvulcanized casing claps are cut into appropriate sizes, stretched using a force cutter (for example, a guillotine cutter), and then stretched using a flat roller. /L
Calender one sheet of 1@ to a certain thickness and apply it on a former as shown in FIG.
It is common to form a 1m long tunnel.

Therefore, the process of forming the fiber cord reinforcing layer requires an extremely large number of steps, and is complicated, time consuming, and inefficient.

In addition, if the casing wrap is cut by hand, it is difficult to cut it to a short length, so a smooth calendar sheet is best. Since there is a large amount of residual air, if the vulcanization time is shortened, this becomes continuous porous, which reduces the durability of the tire.

The present invention has been made in view of the above-mentioned conventional problems, and is made of R-fiber cord reinforcement made of frozen crushed pieces of unvulcanized rubber fiber cord material! - The method for manufacturing such an elastomer article includes cooling an unvulcanized rubberized fiber cord material to a constant temperature using the sensible heat of liquid nitrogen and crushing it; This crushed piece is put into an open roll and formed into a sheet with a desired cross-sectional shape, and this is atomized as a fiber cord reinforcing layer, greatly simplifying the process of forming the fiber cord layer. In addition to improving calender dimensional accuracy, it also increases the durability of elastomer articles by realizing a high-density reinforcing layer with no residual air.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail regarding solid tires with reference to the accompanying drawings.

As shown in FIG. 2, the unvulcanized rubberized fiber cord material 4 is
Using the sensible heat of liquid nitrogen gas, scraps of unvulcanized casings such as nylon, polyester, and rayon used in ordinary pneumatic tires are scraped to -50% by using the sensible heat of liquid nitrogen gas.
After freezing to below ℃, crush. This crushed piece (fiber cord length: 15 to 25 days) is in a dry state, and therefore, handling in the process is a major problem.

This crushed piece is 60°~80t! The sheet is put into an open row/I15 heated to 100 mL, calendered as a sheet of arbitrary thickness and width (for example, 10 mm thick x 240 mm wide), then cut into 10 mm lengths, and wound up onto a liner.

On the other hand, raw materials for tread rubber are produced using known methods such as extrusion machines. A desired cross-sectional shape is extruded from this.

The calender sheet of the fiber cord material 4 is wound on a molding former 6 to form a fiber cord layer 2, and then wound on the tread rubber sheet fiber cord layer 2 to form a tread rubber layer 3 to complete the low cover. . This is placed in a vulcanizing press 7 and finished by vulcanization.

Therefore, in forming the fiber cord layer 2, the steps of cutting, stretching, and calendering among the above-mentioned conventional steps are omitted.

As is clear from the above description, the present invention freeze-pulverizes an unvulcanized fiber cord material and calenders the crushed material with an open roll to form a sheet, which is used as a fiber cord reinforcing layer of an elastomer article. Since it is a TiSi2 material, it is possible to replace the many complicated steps required for forming the conventional fiber cord layer with TiSi2.
This will happen.

In addition, since the length of the fiber cord is short, a smooth calender sheet can be obtained, which improves calender dimensional accuracy.
Due to the high sheet density, there is almost no air remaining.
Therefore, a highly durable elastomer article with few continuous porosity etc. can be obtained.

It goes without saying that the present invention is applicable not only to solid tires but also to various mats, rubber plates, fenders, etc.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a pneumatic solid tire, and FIG. 2 is a process diagram of a method for manufacturing a solid tire according to the present invention. 2...Base portion fiber cord reinforcement layer, 4...Casing scrap (unvulcanized fiber cord material), 5-1+-open roll, 6IllI/molding former - patent applicant
Sumitomo Rubber Industries, Ltd. Procedural Amendment Form Stamp Button 1. Indication of the case 1982 Patent Application No. 31126 2 Title of the invention Elastomer article and method for manufacturing the same 3
, Relationship with the case of the person making the amendment Patent applicant 4. Date of amendment order (voluntary) 5. Scope of claims and detailed description of the invention of the specification to be amended. 6. Contents of amendment (1) Claim 11 is as shown in the attached sheet. (2) On page 1, lines 17-18 of the specification, "casing scrap" is corrected to "casing material." On page 2, line 7, the phrase “casing scrap” has been replaced with “
"Casing material". On page 3, line 13, the phrase ``casing scrap'' has been corrected to ``casing material, e.g. casing scrap.'' Attachment Claims (1) An elastomeric article comprising a fiber cord reinforcing layer made of frozen crushed pieces of unvulcanized rubberized fiber cord material. (The 2B unvulcanized rubberized fiber cord material is cooled to a certain temperature using the sensible heat of liquid nitrogen and crushed, and the crushed pieces are put into an open row/L' and formed into a sheet with the desired cross-sectional shape. 2. A method for manufacturing an elastomer article, characterized in that 2) this is provided as a fiber cord reinforcing layer.

Claims (2)

[Claims] (1) An elastomer article having a fiber cord reinforcement layer made of frozen crushed pieces of unvulcanized rubberized fiber cord material. (2) A method for producing an elastomer article, which comprises forming an unvulcanized rubberized fiber hood material into a sensible heat sheet of fluid nitrogen, and atomizing this as a fiber cord reinforcing layer.