JP2011001661A - Cord fabric for tire cord - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cord fabric for tire cords which enables easy recognition of a slit position and reduction of work time in a slitting process to reduce production cost and improve productivity for producing a jointless band by slitting a top web.SOLUTION: The cord fabric for tire cords is formed by weaving a large number of warp tire cords and a small number of wefts. One or two tire cords twisted reverse to the other tire cords are placed in a large number of tire cords interposing a predetermined number of cords. As an alternative, the large number of tire cords in the cord fabric contain a predetermined number of normal twist tire cords and a predetermined number of reverse twist tire cords in an alternately arranged manner.

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire cord weave fabric, and more particularly, to a tire cord weave fabric used for making a top fabric for a jointless band.

  In the tire manufacturing process, various members such as a tape or a belt are used (for example, Patent Document 1), and one of them is used for the purpose of improving the durability and running stability of the tire. There is a tape-like fiber cord band (jointless band: hereinafter also referred to as “JLB”).

  This tape-like JLB is provided in a form in which rubber is topped on a predetermined number (usually 3 to 20) of tire cords (hereinafter also simply referred to as “cords”) arranged at equal intervals. In order to fulfill the purpose, the number of codes in each JLB is required to be uniform.

  For this reason, at first, a method called “single cord method” in which a predetermined number of single cords are arranged at equal intervals and rubber is topped on both front and back surfaces to obtain a JLB was used. Therefore, the manufacturing cost is remarkably high and the productivity is not high.

  Therefore, in recent years, first, 1000 to 2000 tire cords are arranged as warp yarns to produce a wide tire cord weave fabric (hereinafter also simply referred to as “binder fabric”), and then on both sides of the weave fabric. A method of obtaining a desired size JLB by topping rubber to make a top anti-slip and further slitting the top anti-strip every predetermined number of cords is widely used. In this method, since a large number of JLBs can be obtained at once by slitting the wide top, the manufacturing cost can be reduced and the productivity can be improved.

  In the above, the slit on the top side is performed using a knife, but the interval for inserting the knife needs to be set so that each JLB has a predetermined number of codes as described above. At this time, it is conceivable that a plurality of knives are fixed at regular intervals and cut. However, the arrangement density of the cords on the top side is usually varied in the range of 3 to 4 per 5 cm at both sides and the center. Therefore, when this method is adopted, the number of codes of each JLB after the slit may vary. When JLB with variations in the number of cords is used, there is a risk that stable tire durability and running stability may not be obtained.

  In order to avoid this, normally, the number of cords is checked so that the number of cords is equal, and a knife is inserted for each predetermined number of cords. However, since it is difficult to count the number of cords from the top of the top with black rubber topped, it increases the work time in the slit process, reducing the manufacturing cost and improving the productivity that are the advantages of this method Cannot be fully exhibited.

JP-A-8-295102

  Therefore, in view of the above problems, the present invention makes it possible to easily know the slit position when slitting the top surface to produce a jointless band, shortening the working time in the slitting process, and manufacturing. It is an object of the present invention to provide a weave fabric for tire cords that can reduce costs and improve productivity.

The weave fabric for tire cords according to the present invention is
A tire cord weave fabric formed by weaving a large number of warp tire cords and a small number of weft yarns,
A large number of the tire cords are provided with one or two tire cords for each predetermined number, and tire cords reversely twisted with respect to other tire cords.

Moreover, the weave fabric for tire cords according to the present invention is:
A tire cord weave fabric formed by weaving a large number of warp tire cords and a small number of weft yarns,
A predetermined number of forward-twisted tire cords and counter-twisted tire cords are alternately arranged on the multiple tire cords.

  According to the present invention, when producing a jointless band by slitting the top anti-strip, the stripe pattern rises at the portion where the top anti-twisted tire cord topped with rubber is arranged, so the slit position can be easily set. I can know. For this reason, the working time in the slit process can be greatly shortened, and the manufacturing cost can be reduced and the productivity can be improved.

It is a figure showing typically an example of the textile fabric for tire cords concerning the present invention. It is a perspective view which shows typically a mode that the top sheet | seat using the tire fabric for tire cords shown in FIG. 1 is slit. It is a figure which shows typically another example of the weave fabric for tire cords concerning the present invention. It is a perspective view which shows typically a mode that the top reaction using the weave fabric for tire cords shown in FIG. 3 is slit.

  Hereinafter, the present invention will be described based on the embodiments. Note that the present invention is not limited to the following embodiments. Various modifications can be made to the following embodiments within the same and equivalent scope as the present invention.

(Embodiment 1)
1. Tire Cord Weave Fabric First, the tire cord weave fabric according to the present invention will be described. FIG. 1 is a view schematically showing an embodiment of a tire cord weave fabric according to the present invention.

  As shown in FIG. 1, the tire cord weave fabric A is formed by weaving a small number of weft yarns 3 using a large number of tire cords arranged in parallel with each other as gaps 1 having equal intervals. ing.

  The tire cords are twisted in the opposite direction from the other tire cords (normally twisted cords) for each predetermined number corresponding to the desired number of JLB cords. A cord (reverse twisted cord) is arranged. For example, in FIG. 1, in order to obtain a JLB having four tire cords, three regular twisted cords 2 and one reverse twisted cord 2a are repeatedly arranged.

  In FIG. 1, the reverse twisted cords 2a are arranged one by one, but may be arranged two by two. In this case, the slit position can be more easily confirmed in the slit operation described later. In addition, if the top anti-slit is slit between the two reverse twisted cords 2a, the arrangement of the tire cords in the obtained JLB is preferably left-right symmetric including twists.

  In addition, as for the twist of the normal twist cord 2 and the reverse twist cord 2a, it is sufficient that one side is an S twist (right twist) and the other one is a Z twist (left twist), and tire cords of the same material and thickness may be used. For example, the physical properties of tire cords such as tension and intermediate elongation do not change regardless of S-twisting or Z-twisting, so changing tire performance even if S-twisting tire cords and Z-twisting tire cords are mixed. There is no.

  A tire cord weave fabric having such a tire cord arrangement can be obtained by arranging one or two counter-twisted cords at equal intervals on the leads in the weaving process.

  The material and thickness of the tire cord, the interval of the gap 1, the total number of tire cords, and the like are appropriately determined within a predetermined range corresponding to the desired JLB.

  For example, the material of the tire cord includes synthetic fibers such as nylon (polyamide fiber), Kevlar (aramid fiber manufactured by DuPont), PEN (polyethylene naphthalate), PET (polyester fiber), or pulp fibers such as rayon. Any conventionally used tire cord can be appropriately selected and used. Moreover, as a total number, it can determine suitably from the range of 1000-2000 normally.

  Moreover, as the weft 3, it can select suitably according to the material of a tire cord, for example, a polyethylene fiber etc. can be mentioned.

2. Production of Top Fabric Next, production of the top fabric using the above-described tire cord weave fabric will be described. The top wafer is produced by the following procedure.
First, in order to improve the adhesion between the tire cord and the rubber, a dip treatment is applied to the tire cord weave fabric by a known method.

  Top rubber is coated on both the front and back surfaces of the dip-treated tire cord fabric.

  At this time, due to the tension applied to the tire cord (warp) during the manufacturing process of the tire weave fabric for the tire cord, the tightening direction when the twist of the tire cord is changed due to the difference in the twist direction. A stripe pattern appears in the part where the twisted cord is arranged.

3. Preparation of JLB The obtained top material is slit, and a JLB having a desired size is prepared by the method shown in FIG. FIG. 2 is a perspective view schematically showing a state where the above-described top sheet is slit.

  As shown in FIG. 2, using the stripe 2b appearing at the position of the reverse twist cord 2a of the top anti-A1 as a mark, a knife 5 is inserted along the stripe 2b, and the topping rubber 4 layer of the top anti-A1 is cut. Thus, a desired JLB can be easily and reliably produced. Instead of cutting the top anti-A1 directly to obtain the JLB directly, first slitting the top anti-A1 in units of a number corresponding to a predetermined number of JLBs to make a mother tape, and cutting the mother tape to obtain the desired JLB It may be produced. Also in the production of the mother tape, the desired mother tape can be produced easily and reliably by counting a predetermined number of stripes and inserting the knife 5 in the same manner as described above.

(Embodiment 2)
In this embodiment, a predetermined number of forward-twisted tire cords and counter-twisted tire cords are alternately arranged as warp yarns, and a weave fabric for tire cords formed by weaving such warp yarns with weft yarns is used. Used. In the following description, descriptions overlapping with those in the first embodiment are omitted.

1. Tire Cord Weave Fabric FIG. 3 is a diagram schematically showing a tire cord weave fabric according to the present embodiment. As shown in FIG. 3, the tire cord weave fabric A is formed by weaving a small number of weft yarns 3 with a large number of tire cords arranged in parallel to each other with gaps 1 having the same interval therebetween. ing.

  In addition, a predetermined number (four in FIG. 3) of regular twisted tire cords 2 and counter-twisted tire cords 2a are alternately and repeatedly arranged on the numerous tire cords.

  A tire cord weave fabric having such a tire cord arrangement can be obtained by alternately arranging a predetermined number of forward-twisted cords and reverse-twisted cords on the leads in the weaving process.

2. Next, using the above-described tire cord weave fabric, a top fabric is fabricated by the same method as in the first embodiment.

  At this time, as in the first embodiment, a stripe pattern appears in the portion where the reverse twisted cord is arranged on the surface opposite to the top.

3. Production of JLB The obtained top material is slit, and a JLB having a desired size is produced by the method shown in FIG. FIG. 4 is a perspective view schematically showing a state where the above-described top sheet is slit.

  As shown in FIG. 4, using a series of stripes 2b appearing at the position of the reverse twisted cord 2a of the top anti-A1 as a mark, a knife 5 is inserted along both sides of the series of stripes 2b, and a top anti-A1 topping rubber By cutting the layer 4, the desired JLB can be easily and reliably produced.

4). Examples and Comparative Examples (1) Example 1
The present example is a tire cord weave fabric having 1500 warp cords, and one reverse twist cord for every ten yarns, 9 S twist warp cords and one Z twist reverse The combination of twisted cords is repeated 150 times.

  The top cord was formed by covering the above-mentioned tire cord weave fabric with a topping rubber. Thereafter, a knife was inserted along the tenth stripe appearing on the surface opposite to the top, and the setup operation for obtaining 15 mother tapes of 100 tire cords was completed in 5 minutes. Furthermore, a knife was inserted along each stripe of the mother tape, and the setup work for obtaining JLB of 10 tire cords was completed in each working time of 3 minutes for each mother tape. Therefore, the total setup work time in Example 1 was 5 minutes + (3 minutes / 15 × 15) = 50 minutes.

(2) Example 2
The present embodiment is a tire cord weave fabric having 1500 warp cords, and ten regular twisted (S twisted) cords and reverse twisted (Z twisted) cords arranged alternately. Repeated 75 times.

  The top cord was formed by covering the above-mentioned tire cord weave fabric with a topping rubber. After that, using a series of stripes appearing on the top surface as a landmark, a knife was inserted as a unit with 5 sets of parts with and without a series of stripe patterns, and the working time was 4.5 minutes. Setup work to obtain 15 mother tapes was completed. Furthermore, knives were inserted along both sides of each series of stripes of this mother tape, and the setup work for obtaining 10 tire cords for each tire tape was completed in 2.5 minutes for each mother tape. . Therefore, the total setup operation time in Example 2 was 4.5 minutes + (2.5 minutes / 15 × 15) = 42 minutes.

(3) Comparative Example A top fabric was formed in the same manner as in the example, using a tire cord weave fabric in which all 1500 S-twisted tire cords were arranged. Then, count the 100 tire cords in the cross section of the top counter, or count the 100 tire cords in a state where the end is separated and the tire cord protrudes from the end opposite the top, and there is a knife. And 15 mother tapes of 100 tire cords were obtained. The setup work time at this time was 30 minutes. Further, for each mother tape, 10 tire cords were counted in the same manner as when the mother tape was manufactured from the top side, and a knife was put therein to obtain JLBs each having 10 tire cords. The setup work time at this time was 15 minutes each. Therefore, the total setup work time in this comparative example was 30 minutes + (15 minutes / 15 × 15) = 255 minutes.

(4) Evaluation As described above, by using the weave fabric for tire cords according to the present invention, it is possible to greatly shorten the setup work time and improve productivity. Moreover, the braided fabric for tire cords according to the present invention can be manufactured by replacing a part of a large number of tire cords with reverse twisted cords, or by alternately arranging a predetermined number of forward twisted cords and reverse twisted cords. Therefore, it is not necessary to change the manufacturing process of the tire cord weave fabric, the existing equipment can be used as it is, and the cost is not increased.

A Cloths for tire cord 1 Crevice 2 Forward twisted cord 2a Reverse twisted cord 2b Stripe 3 Weft 4 Topping rubber 5 Knife

Claims (2)

A tire cord weave fabric formed by weaving a large number of warp tire cords and a small number of weft yarns,
A tire weave fabric for tire cords, characterized in that one or two tire cords are arranged for each predetermined number of tire cords, and the tire cords are reversely twisted from other tire cords. A tire cord weave fabric formed by weaving a large number of warp tire cords and a small number of weft yarns,
A tire weave fabric for tire cords, wherein a predetermined number of forward-twisted tire cords and reverse-twisted tire cords are alternately arranged on the plurality of tire cords.

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