JP2006231568A - Manufacturing method of cord-containing rubber member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for suppressing the exposure of cords at the time of cutting of a cord-containing rubber member by relaxing the shrink force of a rubber after insulation. <P>SOLUTION: The cord-containing rubber member 10 immediately after rubber coating discharged from an insulation head 52 is heated by a far infrared heater 20 while drawing out the cord-containing rubber member 10 using a pull drum 30 to relax the shrink force of the rubber applied to the cords. By this method, the lowering of the adhesion force of the rubber to the cords is prevented to suppress the exposure of the cords at the time of cutting. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method of manufacturing a corded rubber member used for a tire belt or the like, and more particularly, to a method of suppressing cord exposure when a corded member is cut.

Conventionally, a corded rubber member used for a carcass ply, a beat wire, a steel belt, or the like of a tire is manufactured using, for example, a wire insulation device 50 as shown in FIG. Specifically, this is an apparatus for adhering a high-temperature rubber member 12 obtained by kneading and extruding a cord 11 such as a plurality of wires conveyed from a winding roll (not shown) by an extruder 51 onto the cord 11. The rubber member 12 is supplied to the insulation head 52 and the rubber member 12 is attached to the cord 11 in the insulation head 52 to obtain the belt-shaped cord-containing rubber member 10. At this time, heating means 53 such as a heater is disposed in front of the insulation head 52, and the cord 11 is heated and then insulated, thereby improving the adhesion of the rubber member 12 to the cord 11. Thus, a method for reducing the coating failure of the corded rubber member 10 has been proposed (for example, see Patent Document 1).
JP 2003-278086 A

The corded rubber member 10 is then cut into a predetermined size by a cutting device and sent to a tire molding process. At the time of the cutting, as shown in FIG. 4, the cut end of the corded rubber member 10 is cut. In 10a, there has been a problem that the covered cord 11 is exposed due to the shrinkage of the rubber member 12, and so-called cord exposure occurs.
The occurrence of such cord exposure is considered to be affected by the strength of rubber adhesion to the cord 11, but in the method of heating the cord 11 in advance and then performing the insulation as in the conventional example described above. Although the adhesiveness of the rubber to the cord 11 is improved, it is difficult to sufficiently suppress the cord exposure because the rubber contraction force is large.

  The present invention has been made in view of the conventional problems, and an object of the present invention is to provide a method of suppressing the cord exposure at the time of cutting the corded rubber member by relaxing the shrinkage force of the rubber after the insulation. To do.

As a result of intensive studies, the present inventors have found that the occurrence of cord exposure is due to the fact that the cord-containing rubber member after insulation is pulled out into the air from the high-temperature head portion and cooled, and then contracted by the rubber. If the rubber member containing the cord after the insulation is heated to reduce the shrinkage force of the rubber The inventors have found that the occurrence of the code exposure can be suppressed, and have reached the present invention.
That is, the invention according to claim 1 of the present application is a method of manufacturing a corded rubber member by coating a cord with a high-temperature rubber member supplied from an extruder, the corded rubber member immediately after rubber coating Is heated to relieve the shrinkage force of the deposited rubber.
According to a second aspect of the present invention, in the method for producing a corded rubber member according to the first aspect, the corded rubber member is heated while being pulled out.

According to the present invention, when a corded rubber member is manufactured by covering a cord with a high-temperature rubber member supplied from an extruder, the corded rubber member immediately after the rubber coating is heated and deposited. Since the contraction force of the rubber is relaxed, it is possible to prevent the adhesion force of the rubber to the cord from being lowered, and it is possible to suppress the cord exposure at the time of cutting.
At this time, if the corded rubber member is heated while being pulled out, the contraction force of the rubber can be alleviated uniformly, and a corded rubber member that is continuously heat-treated can be produced. .

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic view showing an embodiment of the present invention. In FIG. 1, reference numeral 50 denotes an extruder 51 for kneading and supplying the rubber member 12 at a high temperature, and the rubber member 12 is attached to the cord 11. An insulation head device including an insulation head 52, 20 is a far-infrared heater provided at the outlet 52a of the insulation head 52, and heats the rubber-coated cord member 10 with rubber, and 30 is the heat treatment. This is a pull drum for continuously pulling out the corded rubber member 10.
Next, the operation of the present invention will be described.
The far-infrared heater 20 serving as the heating means is disposed in the outlet 52a of the insulation head 52, whereby the corded rubber member 10 immediately after the insulation can be heated at a high temperature. That is, in this example, since the corded rubber member 12 immediately after the insulation is not rapidly cooled, compared with the conventional example in which the corded rubber member 10 immediately after the insulation is sent directly into the air, The shrinkage force of rubber accompanying cooling can be relieved greatly.
In this way, if the contraction force of the rubber generated immediately after the insulation is eased, it is possible to prevent a decrease in the adhesive force of the rubber to the cord 11, so that the occurrence of cord exposure during cutting is suppressed. Is possible.
At this time, if the corded rubber member 10 is heated while being pulled out by using a pull drum 30 or the like, the corded rubber member 10 is heated uniformly in a tensioned state. As a result, it is possible to reliably relieve the shrinking force of the rubber and to produce a cord-containing rubber member that is continuously heat-treated.

Thus, according to this best mode, the rubber member 10 with the cord immediately after the rubber deposition discharged from the insulation head 52 is heated by the far-infrared heater 20 to shrink the rubber deposited on the cord 11. Since the force is relaxed, it is possible to prevent the adhesion of rubber to the cord 11 from being lowered, and to suppress the cord exposure at the time of cutting.
Further, since the corded rubber member 10 is heated while being pulled out by using the pull drum 30 or the like, the contraction force of the rubber can be uniformly relieved, and the corded rubber that has been continuously heat-treated. Parts can be produced.

In the above-described best mode, the far infrared heater 20 is used as the heating means. However, the present invention is not limited to this. For example, as shown in FIG. 2, using other heating means such as a warm air heater 21, The same effect can be obtained even if the corded rubber member 10 immediately after the rubber is deposited discharged from the insulation head 52 is heated.
In the above example, the case where the rubber member 12 is attached to the cord 11 using the insulation device 50 has been described. However, the present invention is not limited to this, and the present invention is not limited to other rubber coating devices such as a calendar device. It is also applicable when using.

  Thus, according to the present invention, the cord exposure at the time of cutting can be suppressed with a simple configuration, so that defects at the time of cutting can be reduced and the productivity of the rubber member with the cord is improved. Can do.

It is a schematic diagram which shows the best form of this invention. It is a figure which shows the other manufacturing method of the rubber member with a cord by this invention. It is a figure which shows the manufacturing method of the conventional corded rubber member. It is a figure for demonstrating the cord exposure in the rubber member with a cord.

Explanation of symbols

10 cord rubber member, 11 cord, 12 rubber member, 20 far infrared heater, 30 pull drum, 50 insulation device, 51 extruder,
52 Insulation head.

Claims (2)

  When a corded rubber member is manufactured by coating a cord with a high-temperature rubber member supplied from an extruder, the corded rubber member immediately after the rubber is applied is heated to reduce the shrinkage force of the deposited rubber. A method for producing a corded rubber member, characterized in that: 2. The method for manufacturing a corded rubber member according to claim 1, wherein the corded rubber member is heated while being pulled out.

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