JP3197604B2 - Manufacturing method of rubber sheet containing wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a rubber sheet containing a wire in which a thin rubber layer is applied to a wire such as a cord or a fiber. The rubber sheet containing the wire is used particularly for a carcass ply, a bead portion reinforcing layer or a belt of a tire to assist in reinforcing the tire.

[0002]

2. Description of the Related Art As shown in FIG. 1, a rubber sheet containing a wire mainly used as a reinforcing layer of a tire is formed by winding a spool 2 around which a wire 1 is wound into a number corresponding to the number of driving required for the rubber sheet. The above is arranged, and the wires 1 unwound from the predetermined number of spools 2 are introduced one by one into the guide plate 3 after being bent largely, and then each wire 1 is aligned almost in parallel, and then the comb tooth roll is further rolled. 4 and a predetermined number of wires 1 are sent out to the calender 5 therefrom. Then, the rubber sheet 6 and the wire 1 introduced separately from the wire 1 are combined by rolling with the calendar 5 to form a rubber sheet 7 containing the wire.

[0003]

As a means for improving the fuel efficiency of automobiles, it is important to reduce the weight of tires. For this reason, it is necessary to reduce the diameter of a cord used for the reinforcing layer of the tire. Measures have been taken to simplify the code. Furthermore, when this simplified cord is used, it is customary to increase the number of cords to be inserted in order to maintain the strength of the reinforcing layer.

An increase in the number of cords to be driven naturally leads to an increase in the number of wires 1 leading to the calendar 5, so that the number of spools 2 to be installed also increases. Therefore, it is necessary to add an installation part for a new spool to the existing creel stand, and since the creel stand usually consists of several units of the same type, the creel It is necessary to add an extension to all of the stands, which requires a large capital investment. Also, if you want to increase the spool mounting part above the existing creel stand, it is not necessary to increase the creel stand installation area,
In view of the restrictions on the ceiling height of the factory and the safety of mounting the spool at a high place, the creel stand needs to be extended in the horizontal or depth direction. In such a case, the installation place of the creel stand is naturally expanded, and the expansion of the factory is required. Furthermore, an increase in the number of spools means an increase in the total time for attaching the spools to the creel stand.

Further, as shown in FIG. 2, since the wire 1 is guided from a large number of spools 2 to the guide plate 3, the angle of introduction into the guide plate 3 becomes large, and the wire 1 is damaged by friction with the guide plate 3. In the case of a steel cord, the plating layer on the peripheral surface is peeled off, and in the case of an organic fiber, the dip layer on the peripheral surface is peeled off, and the adhesiveness to rubber is deteriorated.
This phenomenon appears remarkably when the spool extension portion is extended in the horizontal direction and when the spool extension portion is extended in the upper (ceiling) direction.

On the other hand, as disclosed in Japanese Utility Model Application Laid-Open No. 24603/1988, a reinforcing layer in which normally arranged cords are arranged irregularly or several cords are arranged in a bundle. In this case, it is necessary to introduce several cords into the very close holes of the guide plate 3, and in particular, the introduction angle to the guide plate 3 may increase.

Therefore, the present invention can advantageously solve the above-mentioned problems, especially by devising the wire feed side.
An object of the present invention is to propose a method for manufacturing a rubber sheet containing a wire.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a wire rod unwound from a plurality of spools is aligned by a guide plate, and then guided to a comb-tooth roll. A method for manufacturing a rubber sheet containing a wire, characterized by winding a plurality of wires and simultaneously sending out a plurality of wires from each spool to a guide plate.

[0009]

As already shown in FIG. 2, in the conventional feeding of the wire 1 from the spool 2, since one wire 1 is unwound from each spool 2, when the total number of wires 1 increases, a large number of wires 1 increase. The creel stand must be installed regardless of whether the spool 2 has to be installed and the mounting portion of the spool 2 is extended in the direction along the guide plate 3 or in the depth direction opposite to the cord pull-out direction. Expansion of the installation area is inevitable. In addition, in either case of extending in the direction along the guide plate 3 or stacking in the upward direction, the angle at which the cord is introduced into the guide plate 3 must be increased. Further, it is needless to say that capital investment for adding a spool mounting portion to all the creel stands is required, and that the total time for mounting the spool to the creel stand is increased.

On the other hand, in the present invention, by winding a plurality of wires around each spool,
For example, as shown in FIG.
First, by winding two wires 1 around
The installation area of the spool is halved, and the angle of introduction to the guide plate 3 is reduced. Therefore, the guide plate 3
Strong friction between the wire and the wire 1 is avoided, and the wires can be aligned and sent to the calender without damage.

Further, since the application of the present invention immediately leads to a reduction in the number of required spools, even when the total number of cords is increased by using thin cords, the total time required to attach these spools to the creel stand is increased. Will not increase. As a matter of course, there is no increase in the installation area of the creel stand or new capital investment.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In manufacturing a rubber sheet containing a wire according to the procedure shown in FIG. 1, the wire is fed from a spool in which 2 to 5 wires shown in Table 1 are wound in accordance with the place shown in FIG. According to the width of 1000 mm and the number of shots shown in Table 1, a rubber sheet containing a wire was produced. As a comparison, a similar rubber sheet containing a wire was manufactured by a conventional method of sending one wire from each spool.

With respect to the rubber sheet containing the wire thus obtained, the rubber sheet using a steel cord as a wire is dissected, and the state of the plating layer on the peripheral surface of the filament constituting the steel cord is investigated. The workability and the area used by the creel stand in production were evaluated. These results are also shown in Table 1.

The state of the plating layer in the filament was measured according to the following procedure. First, only the plating layer was dissolved with a chemical, the weight was measured, and the volume of the plating layer was calculated from the measured value and the specific gravity of the plating layer.
Next, the thickness of the plating layer was determined by dividing the determined volume of the plating layer by the total surface area of the filament. Incidentally, the thickness of the plating layer without being damaged by the guide plate 3 is about 0.2 μm.

[0015] The workability of the method according to the present invention is as follows.
The time required to attach all the used spools to the creel stand was evaluated by the value obtained by dividing the same time by the comparative example.

The area of use of the creel stand was evaluated by dividing the area of the creel stand required for mounting all the spools used in the method according to the present invention by the same area as in the comparative example. In the comparative example, the number of spools was increased in the direction along the guide plate.

[0017]

[Table 1]

[0018]

According to the present invention, the angle at which the wire is introduced when the wires are aligned by the guide plate is reduced, so that the damage to the wire, which has conventionally been inevitably caused when the number of wires to be driven increases, is prevented. In addition, there is no need to increase the installation area of the creel stand or invest in new equipment. In addition, since the work of aligning the wires is facilitated, the production of the rubber sheet containing the wires can be simplified, and the production of the reinforcing layer using the cords having an irregular arrangement is also significant.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a procedure for manufacturing a conventional rubber sheet.

FIG. 2 is a schematic view showing the feeding of a wire from a spool.

FIG. 3 is a schematic diagram showing the feeding of a wire from a spool according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 wire 2 spool 3 guide plate 4 comb tooth roll 5 calender 6 rubber sheet 7 rubber sheet with wire

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-61-229515 (JP, A) JP-A-3-197121 (JP, A) JP-A-64-75227 (JP, A) JP-A-1- 295836 (JP, A) JP-A-58-81151 (JP, A) JP-A-2-150340 (JP, A) JP-A-52-8084 (JP, A) JP-A-2-504613 (JP, A) Japanese Utility Model Application No. 59-75029 (JP, U) Japanese Utility Model Application No. 59-110620 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29D 30/00-30/72 B29C 70/00 -70/88 C08J 5/00-5/24

Claims (1)

(57) [Claims] 1. A method in which a plurality of spools are wound out of a plurality of spools, and the unwinded strands are aligned by a guide plate, and then guided to a comb-shaped roll. A method for producing a rubber sheet containing a wire, wherein a plurality of wires are simultaneously sent out from a spool to a guide plate.