JP3236896B2 - Weft removal method for blind fabric - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blind fabric for a topping sheet woven from a large number of warps and wefts.
And a method of removing weft yarns.

[0002]

2. Description of the Related Art Conventionally, tire construction materials such as tire carcass and belts and other industrial materials include blind fabrics as shown in FIG.
That is, a blind woven fabric (1) woven by driving a large number of warp yarns (2) made of fiber cords and the like into a thin weft (3) that plays the role of a link at every required longitudinal direction interval,
Commonly used. After being subjected to heat treatment, adhesive treatment, or the like, the blind fabric is coated with rubber on at least one side, usually both sides, and is used as a so-called topping sheet.

When such a topping sheet is used as a tire component, the weft (3) in the above-mentioned blind fabric does not play any effective role in reinforcing the tire, and the presence of the weft (3) does not matter. Therefore, there is a disadvantage that the performance of the tire is deteriorated.

That is, as shown in FIG. 5, in a state in which rubber (R) is topped on a bamboo weave (1), a weft (3) crosses over a warp (2) and alternately goes up and down.
Due to the influence of the warp (2), the warp (2) does not line up in one plane and is arranged in a staggered manner.
Requires extra rubber for the step (d) due to the staggered arrangement of
The amount of rubber used increases, and it also hinders weight reduction.

Further, since the weft (3) is present, the parallel pitch (p) of the warp (2) tends to be non-uniform, hindering uniform inflation during vulcanization of the tire and causing poor tire uniformity. Further, the material of the weft (3) is a spun yarn such as cotton or rayon, which has poor adhesion to rubber, and has a problem that separation is easily generated from the weft (3).

[0006] Therefore, recently, a large number of warps are arranged in parallel without a weft to form a sheet, and a topping sheet without a weft, at least one side of which is coated with rubber, is often used as a tire component. I have.

As a method of manufacturing this topping sheet without weft, a warp consisting of a large number of cords is arranged in parallel and wound around a beam, and the warp is drawn out of the beam and treated with an adhesive in a state of being arranged in a sheet. A method has been proposed in which the rubber is supplied to a calender while covering the rubber (for example, JP-A-63-59526). There is also known a method in which weft is removed from a blind fabric and covered with rubber as in the prior art (for example, JP-A-61-113877).

However, in the case of using the above-mentioned method in which the warp (cord) wound on the beam is drawn out and used, since the warp (cord) is not connected to each other, the warp (cord) is easily moved, and the bonding up to the topping step by the calendar is performed. Troubles such as broken cords are likely to occur at the time of agent treatment or the like, and if broken cords occur, all products will be defective. Therefore, only small-scale processing can be performed at a relatively low speed, resulting in poor productivity and high cost.

As disclosed in Japanese Patent Application Laid-Open No. 64-45627, it has been proposed to fix a cord by sticking a flowable substance to a sheet-like material consisting of only a cord extracted from a beam. However, in this case, it is not preferable because different kinds of substances are mixed in the rubber.

On the other hand, in the method of removing the weft from the blind fabric and supplying it to a calender to cover the rubber, it is desired that the removal of the weft can be performed efficiently and completely with simple equipment. Means proposed in JP-A-113877 is to move the blind fabric in the longitudinal direction,
The weft yarn is finely cut by passing between two roll cutters having a cutting ring that is alternately fitted, and a large number of the cut weft yarns are separated so as to be brushed off by a brush in the succeeding portion, and further the weft yarn that has been further cut off. Is collected by vacuum suction and removed, which requires extremely complicated and expensive equipment, and has the drawback that 100% of finely cut weft yarns cannot be removed.

In view of the above, the present invention has been made so that the weft can be easily and reliably removed with a simple device and equipment when the blind fabric is used for the topping sheet without the weft. It is an object of the present invention to provide a weft yarn that can be pulled out laterally from the main body of the weft yarn and a weft removing method in which the weft yarn is cut at an intermediate portion in the width direction and drawn out in the lateral direction.

[0012]

SUMMARY OF THE INVENTION The present invention provides a multi-parallel
Wefts are alternately folded on both sides outside the warp and driven
This is a method of removing wefts from a blind fabric.
In the process of supplying the blind fabric to the calendar
And the weft of the blinds moving in the longitudinal direction is
At this point, the warp on both sides
By separating from the body portion of the cord fabric, the switching
Pulling out the cut weft with the side end warp
It is a feature.

[0013]

In the weft removing method of the present invention described above, in the step of supplying the blind fabric to the calender,
The weft of the blind fabric moving in the longitudinal direction is cut at one intermediate portion, and after this cutting, the warps at both ends are separated so as to be separated from the main body of the blind fabric. The drawn wefts are pulled out and removed from the warp group of the main body together with the separating action of the side end warps.

In particular, the tensile strength of the weft of the blind fabric is
If the force is larger than the force for pulling out the weft in the lateral direction, at the time of pulling out the cut weft, there is a possibility that the weft may be cut off and remain on the way due to the adhesive force with the warp due to the adhesive treatment or the frictional force between the warp and the like. And the weft can be completely pulled out and removed.

[0015]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a process diagram of a calendar line for producing a topping sheet (T) used for a tire component such as a carcass of a radial tire.

A blind fabric (1) used as a core material of the topping sheet (T) is, as shown in FIG. 2, provided with a number of warps (2) made of fiber cords or the like and driven at predetermined intervals in the longitudinal direction. It is woven with a thin weft (3) connecting the respective warp yarns (2) in rare cases. In particular, the weft (3) is folded back outside the side end of the blind fabric (1) and is continuously driven.

This blind fabric (1) is subjected to a heat treatment and an adhesive treatment as usual, and is wound around a supply device. As shown in FIG. Weft removal process (10)
After the weft has been removed, the paper is supplied to the roll calender (5) in the topping step.

The calender (5) is a reed (51) for holding the warp group from which the weft has been removed in parallel as shown in the figure.
And a grooved roll (52) and a calender roll (5
3) Rubber (R) is topped on the front and back of the sheet-like material having only the warp from which the weft has been removed, passing between (54).
(6) is a cooling drum following the calendar (5),
(7) is an accumulator, and (8) is a winder for a topping sheet (T).

Thus, the weft removing step (10) is carried out in accordance with FIG.
As shown in FIG. 3, a rotating blade type cutter (11) for cutting the weft (3) is provided at one portion in the width direction intermediate portion of the blind fabric (1), for example, at the center, and the blind fabric ( With the movement of 1), the weft (3) which is folded back at both ends by the cutter (11) and is continuously driven in
Disconnect. The cutter (11) is not limited to the rotary blade type as shown in the figure, and may be a cutter that moves up and down to cut the weft (3).

At a position slightly behind the weft cutting position in the moving direction, guide rollers (12) for extracting are arranged on both sides of the moving blind fabric (1). Take-off rollers (13) and (14) for pinching one or several warps (2a) and forcibly pulling them to the side are arranged, and the warps (2a) at both ends are combined with the remaining weft fabric ( It is provided so that it can be separated to the side from the main body of 1).

In this way, the warp (2a) at both ends is provided.
When the yarn is separated to the side, the weft (3) which is folded at both ends and is continuously driven in and is cut at the center as described above becomes the warp (2a) at the end at the folded portion. The side end warp (2a) is latched and pulled out sideways along with the side end warp (2a), and is completely removed from the warp (2) group of the remaining main body.

Then, the warp (2) group from which the weft (3) has been removed is fed into a subsequent calender (5) in the form of a sheet, and coated with rubber in the same manner as in the prior art, and a topping sheet (T)
To manufacture. (15) is a collection container for the drawn out warp (2a) and weft (3).

When the weft (3) is pulled out,
As shown by a chain line in FIG. 2, the warp (2) does not bend and spread in the width direction as the drawing operation is performed by an adhesive force or a frictional force due to an adhesive treatment between the warp (2) and the weft (3). It is desirable to arrange a nip roll (16) from above, or to arrange guide rollers (17) on both side portions. Thereby, the extraction efficiency can be further improved.

The cutting position of the weft by the cutter (11) can be arranged very close to the starting position of the drawing by the separating action of the side end warp (2a), especially the weft (3).
If the cutting and the drawing start can be performed substantially simultaneously, the weft (3) can be cut by the cutter (11) while a certain amount of tension is applied to the weft (3).

Further, as the weft (3) of the blind fabric (1), spun yarn such as cotton or rayon or other various yarns can be used.
In relation to pulling out the weft (3) by the separating action of a),
The strength of the weft (3), particularly the tensile strength, is the same as that of the weft (3).
, A yarn having a greater force than the maximum force for pulling out the yarn, ie, the adhesive force with the warp (2) due to the adhesive treatment and the pulling force for pulling out the yarn against the frictional force between the warp (2) and the like. For example, in the case of a yarn of the same type as the conventional one, a yarn having a thickness larger than that of the conventional one and having the above strength is used. Needless to say, a thin yarn having the above-mentioned strength can also be used.

If the tensile strength of the weft (3) is smaller than the pulling force, the weft (3) may break during the drawing and remain between the warp (2) groups in the main body. When the strength of the weft (3) is given as described above, the weft (3) can be easily and reliably pulled out without fear of breakage or the like.

As shown in Table 1 below, under the same conditions for the material and the number of warps (2), a fifth-rank cotton yarn was used as the weft (3) (Example 1).
And 550 denier rayon yarn subjected to a Teflon coating process (Example 2), and a yarn using a finer count yarn as the weft (Comparative Examples 1 to 3) were woven and bonded, respectively. The pulling force of the weft after the agent treatment and the possibility of pulling were examined. The results are as shown in Table 1.

[0029]

[Table 1] Thus, when the weft is a relatively thin yarn (Comparative Examples 1 to 5)
3), the strength of the weft at the time of pulling out the weft was insufficient, and the pull-out did not occur. On the other hand, in each of Examples 1 and 2 of the present invention, the weft could be completely pulled out without breaking.

The blind fabric (1) is preliminarily subjected to an adhesive treatment in order to improve the adhesiveness with the topping rubber (R), and the weft yarn (3) is turned into the warp (2) by the adhesive treatment. )), It becomes difficult to pull it out when it is firmly adhered to it, so it is desirable to use a material with low adhesion as the weft (3). For example, in the case of a yarn such as rayon, it is preferable to reduce the adhesiveness by applying Teflon coating as described above.

Further, since the weft (3) of the blind fabric (1) is to be pulled out and removed, the number of driven yarns can be reduced within a range that does not cause inconvenience in heat treatment, adhesive treatment or other handling until the removal of the weft. For example, the number may be 0.5 to 4 within 5 cm.

[0032]

As described above, according to the weft removing method of the present invention, the weft can be completely and easily pulled out and removed by an extremely simple device, and thus the blind fabric is supplied to the calender line in the same manner as before. This makes it easy to implement a topping sheet using a sheet-like material consisting only of a warp group without a weft. Moreover, since heat treatment and adhesive treatment can be performed in the state of the blind fabric,
There is no need to worry about warp cutting or the like during supply to the topping process using a calendar, and high-speed operation can be performed, and productivity can be increased.

In particular, by setting the tensile strength of the weft of the blind fabric to be larger than the pulling force, the weft can be pulled out easily and reliably due to the action of separating the side end warps. In addition, in order to remove the weft, the number of wefts to be driven can be reduced, and the weaving efficiency can be improved. Furthermore, the weft can be made stronger than conventional blind fabrics, so weaving speed of the blind fabric can be increased and the blind fabric after the adhesive treatment does not lose its shape, reducing the problem of tearing during the treatment. I do.

[Brief description of the drawings]

FIG. 1 is a schematic process diagram of a calendar line for carrying out the method of the present invention.

FIG. 2 is a schematic plan view showing an enlarged part of a weft removing step according to the present invention.

FIG. 3 is an enlarged schematic side view of the same.

FIG. 4 is a partial perspective view illustrating a blind fabric.

FIG. 5 is an enlarged sectional view of a part of a conventional topping sheet made of a blind fabric.

[Explanation of symbols]

 (1) Blind fabric (2) Warp (2a) Side end warp (3) Weft (5) Calender (10) Weft removal step (11) Cutter (12) Guide roller for extraction (13) (14) Pickup roller

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-113877 (JP, A) JP-A-58-4603 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29D 30/38 B60C 9/04 D03D 1 / 00,9 / 00,15 / 00

Claims (1)

(57) [Claims] 1. Weft yarns on both ends of a large number of parallel warps
From the bamboo weave, which is alternately folded and driven in on the outside
A method for removing weft yarns, In the process of supplying the blind fabric to the calendar
And move the weft of the blind fabric moving in the longitudinal direction
And cut the warp at both ends
The cutting by separating from the main body of the blind fabric
Specially to pull out the drawn weft with the side end warp.
The weft removal method for the blind fabric.