JP5217938B2 - Weave fabric for carcass of pneumatic tire - Google Patents

Description

  TECHNICAL FIELD The present invention relates to an interwoven fabric for carcass of a pneumatic tire, and more particularly to an interwoven fabric for carcass in which a carcass ply free of yarn disturbance is obtained even when polyketone fibers are used for warp.

  In a pneumatic tire, a carcass is an important part that constitutes a tire frame (casing), and is an element that dominates tire performance such as braking / driving performance and steering stability.

  The carcass is a layered sheet in which a plurality of fiber cords are arranged in a certain direction and rubberized, and the fiber cord is 70 ° to 90 ° in the case of a radial tire with respect to the tire circumferential direction in the tire crown portion. In the case of a bias tire, it is arranged to be 30 to 40 °. In recent years, a tire has been proposed in which braking / driving performance and steering stability are improved by using a polyketone fiber having a high elastic modulus as the fiber cord of the carcass.

  Thus, a carcass in which a large number of fiber cords form a parallel arrangement state is manufactured by weaving a weave fabric using the fiber cord group as a warp group. This interwoven fabric is woven by interweaving a weft yarn with a rough pitch on a warp cord group in which a large number of yarns (generally several hundred or more and the total width is 1 m or more) are arranged in parallel. After weaving, in order to improve the adhesion between the fiber cord and the rubber, a plurality of sheets are connected in the warp direction in a raw weave state, and resorcin-formalin while running in the treatment zone in the long continuous state. -An impregnation treatment with a latex (hereinafter abbreviated as RFL) solution is performed.

  Thereafter, the RFL-impregnated weave fabric is formed into parallelogram-shaped pieces inclined at a constant angle with the warp fabric warp direction so that the tire circumferential direction and the fiber cord group can intersect at the predetermined angle described above with the tire circumferential direction. It is cut and used for the tire molding process.

  However, in the RFL liquid treatment process, there is a heat setting process in which heat treatment is performed at a high tension. As described above, when a polyketone fiber having a high elastic modulus is used for the fiber cord, the braided fabric is caused by the high tension at the time of heat setting. The warp yarn (polyketone fiber cord) moves so as to be shifted inward in the width direction, and there is a problem that warp arrangement disorder (cord disorder) occurs. In particular, when polyketone fibers having a high elastic modulus are used for the warp fiber cords, it is necessary to make the tension higher in the RFL treatment process, and the wobbling fabric moves so as to be displaced inward in the width direction, and the entire width shrinks. The action works greatly.

  And a tire formed by cutting an RFL-impregnated weave fabric formed in a state where warp turbulence is formed to form a carcass has poor uniformity because of a decrease in uniformity, and a decrease in durability due to an increase in abnormal vibration. Various problems occur.

  As a measure for preventing such warp arrangement disturbance of the interwoven fabric, Patent Document 1 is not intended for the polyketone fiber cord having a high elastic modulus, but the weft density of the tabby portion at the anti-start and end of the inter-woven fabric. Has been proposed to be formed in two or more different regions in the warp direction (Patent Document 1). Further, the use of glass fiber as the weft of the tabby portion is also exemplified.

  However, in the case of a weave fabric using a polyketone fiber cord as a warp, the effect of preventing warp turbulence cannot be said to be sufficient if the weft density in the tabby portion is simply varied in two stages.

Further, when glass fibers are simply used for the wefts of the tabby portion, the glass fibers are slippery, so the effect of restraining the warp is weak, and the effect of suppressing the width shrinkage is accordingly small. Further, since the glass fiber wound around the bobbin is slippery in the weaving process, there is a problem that the yarn is frequently dropped from the bobbin when the weft is taken out, and the weaving loom tends to stop each time.
JP 2005-206962 A

  In view of the above points, an object of the present invention is to provide a carcass weave fabric in which a carcass material free of yarn disturbance is obtained even when polyketone fibers are used for warp, and which has no problem in weaving. It is to provide.

  The weave fabric for carcass of the pneumatic tire according to the present invention that achieves the above-described object uses a polyketone fiber as a warp, and uses a fiber yarn having a strength of 3.0 N or more and a breaking elongation of 5.5% or more as a weft. A woven fabric using cords in which glass fibers and spun yarns are aligned on the wefts of the anti-start and end tabby portions of the interwoven fabric.

  According to the weave fabric for carcass of the pneumatic tire of the present invention, in the weave fabric using polyketone fiber as the warp, the cord in which the glass fiber and the spun yarn are aligned is used for the weft of the anti-start and end tabby portions. Therefore, the high-elasticity of the glass fiber and the high frictional force of the spun yarn are synergistic, so that the carcass material has excellent uniformity without generating disturbance of the polyketone fiber cord of the warp against the high tension of the RFL treatment. A pneumatic tire with high uniformity can be manufactured by using the carcass material. Moreover, since the slip of the glass fiber is suppressed even when weaving the bamboo weave, the problem of stopping can be solved.

  Hereinafter, the present invention will be described in more detail with reference to the drawings.

  FIG. 1 illustrates an example of a weave fabric 1 for a carcass of a pneumatic radial tire according to the present invention.

  The interwoven fabric 1 includes a plurality of warp yarns 5 arranged in parallel, which are made of polyketone fiber cords. The warp yarns 4 are driven into the warp yarns 5 so as to intersect with a coarse density to form the main body 3. For the weft 4, a fiber yarn having a strength of 3.0 N or more and a breaking elongation of 5.5% or more is used. A tabby portion 2 having a plain weave structure in which wefts 4 are driven at a higher density than the main body portion 3 is formed in the longitudinal start J and the end K of the interwoven fabric 1. For the weft of the tabby portion 2, a cord in which glass fibers and spun yarn are aligned is used.

  The plurality of braid fabrics 1 are configured such that the tabby portions 2 are joined to a leader cloth (connecting woven fabric) by means such as stitching to form a long braid fabric continuous in the longitudinal direction. The glass fiber in the assortment cord constituting the tabby portion 2 has higher rigidity than the polyketone fiber cord, and the spun yarn has high bulkiness, and thus generates a high frictional force. Therefore, even if high tension is applied in the heat setting step of the RFL treatment step, the polyketone fiber cord of the warp that is going to move inward in the width direction is prevented from moving in the tabby portion 2. As a result, warp disturbance is less likely to occur and the uniformity of the carcass material can be improved. Moreover, there is no inconvenience that the yarn from the weft bobbin slips down during weaving of the weave fabric, and the weaving property of the weave fabric can be improved.

  FIG. 2 shows a carcass weave fabric according to another embodiment of the present invention. 2 is basically the same as that of FIG. 1, except that at least 50 cm away from the tabby portion 2a of the anti-starting J and anti-end K of the interlining fabric 1 toward the main body 3 side, The difference is that the second tabby portion 2b is provided. The separation distance L from the first tabby portion 2a is not particularly limited as long as it is 50 cm or more, but is preferably about 150 cm. Also in this second tabby portion 2b, a cord in which glass fibers and spun yarn are aligned is used as the weft. By providing such a second tabby portion 2b, the effects of the present invention described above can be obtained more synergistically. A preferred longitudinal length of the second tabby portion 2b is 15 to 40 cm.

  In the present invention, as the spun yarn used by being aligned with the glass fiber yarn, for example, a cotton spun yarn or a synthetic fiber spun yarn such as vinylon obtained by a check spinning method such as a perlock type can be preferably used. .

In the present invention, the polyketone fiber used for the warp is preferably one having a chemical structure represented by the following formula (1).
_{- (CH 2 -CH 2 -CO)} n- (R-CO-) m- ............ (1)

Here, in the formula (1), the relationship between n and m is represented by the following formula (2), and R is an alkylene group having 3 or more carbon atoms.
1.05 ≧ (n + m) /n≧1.00 (2)

  In addition, the polyketone fiber has a heat shrinkage stress value of 0.19 cN / dtex or more at a dry heat of 150 ° C. and a shrinkage rate of 5% or less in a state before the RFL treatment is completed and the tire is vulcanized. Some are preferred.

  The weft constituting the body 3 of the interwoven fabric is not particularly limited as long as it is a fiber having a strength of 3.0 N or more and a breaking elongation of 5.5% or more, but preferably a cotton yarn, polynosic yarn, rayon It is preferable to use a yarn, a polyamide unstretched yarn, a polyester unstretched yarn, or a mixed twisted yarn thereof. The weft is not particularly required to have a great strength, and it is sufficient if it is 3.0 N or more capable of maintaining the shape of a weave fabric. The upper limit of the strength is not particularly limited, but is generally around 5 N. The upper limit of the breaking elongation is not particularly limited, but generally, cotton yarn and polynosic yarn are around 8%, and those using undrawn yarn are around 100%. The number of wefts driven in is not particularly limited, but is preferably 2.0 to 5.0 / 50 mm.

  Any conventionally known RFL treatment of the weave fabric can be applied. Generally, after the dipping treatment process of the RFL liquid, it is subjected to a cooling process through a heat setting process and a normalization process.

Examples 1-6, Comparative Examples 1-8
Using polyketone fiber (1100T (dtex) / 2) yarn for warp, the common condition is that the total number of warps is 1716 and the total width is 1430mm. 14 types of weave fabrics for carcass having different weft materials, the presence or absence of the formation of the second tabby portion, and the weft materials as shown in Tables 1 to 3 were woven (Examples 1 to 6, Comparative Examples) 1-8).

  Each of these 14 kinds of bamboo woven fabrics was subjected to RFL dipping treatment in one bath to obtain a carcass material. The number of ends of the polyketone fiber cord in the carcass material is 60/50 mm width. Subsequently, a pneumatic tire having a tire size of 185 / 60R14 was manufactured using these carcass materials.

  The weaving workability of the weave fabric, the fluctuation of the width of the dip when the weave fabric is RFL processed, the state of the end distribution of the carcass on the molding machine at the time of molding the tire, and the manufactured tire. The uniformity was evaluated by the measurement method described below. The evaluation results are as shown in Tables 1 to 3.

  As shown in Tables 1 to 3, according to the present invention, there is no problem in the weaving of the braided fabric, there is no cord disturbance in the RFL treatment, and as a result, air having excellent uniformity and excellent performance can be realized. An inset tire was obtained.

(1) Weaving workability Evaluated by the number of stops of the weaving loom during weaving. The evaluation was performed by a four-stage evaluation of the number of stops 0: ◎ (excellent), 1 or less: ○ (good), 2-4 times: Δ (possible), 5 times or more: × (impossible).

(2) Width fluctuation (width fluctuation opposite to dip),
The width variation from the beginning of winding to the end of winding when dip processing for a length of 1,200 m in the dip was measured, and the evaluation was evaluated by the variation range of 0 to less than 5 mm: ◎ (excellent), less than 5 to 10 mm: ○ (Good), less than 10 to 15 mm: Δ (possible), 15 mm or more: × (impossible).

(3) End distribution on molding machine The state of the end distribution in the tire circumferential direction when cutting a piece of dip anti-roller 1200 m long and pasting it on the molding machine was visually observed and evaluated. The evaluation is that when 15 tires are continuously molded, the number of tires in which three or more end non-uniform portions (with a cord interval more than twice the normal part) have been confirmed is 0 (excellent). The test was conducted in four stages, with 1 to 2 or less being ◯ (good), 3 to 5 or less being △ (possible), and 6 or more being × (impossible).

(4) Uniformity of tire The unevenness of the side portion of the pneumatic tire was measured. The evaluation is ◎ (excellent) for 0.50 mm or less, ○ (good) for more than 0.50 mm to 0.80 mm or less, △ (good) for more than 0.80 mm or less to 1.00 mm, or more than 1.00 mm to 1.20 mm or less. X (impossible) was performed in four stages

  Air was sealed at the maximum air pressure specified by JATMA, and after 24 hours, the unevenness of the sidewall at the tire maximum width position was measured over the entire circumference of the tire. From this data, the PP value (peak-toe-peak value) of displacement at a circumferential length of 1 cm was obtained for the entire circumference of the tire and used as the side unevenness value.

It is a top view which abbreviate | omits the intermediate part of a longitudinal direction, and shows an example of the weave textile for carcass which consists of embodiment of this invention. It is a top view which shows the other example of the weave textile for carcass of this invention similarly to FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Textile fabric for belt covers 2 (2a) Tabby portion 2b Second tabby portion 3 Body portion of weave fabric 4 Weft 5 Warp J Anti-start K Anti-end L Distance between tabby and second tabby

Claims (3)

  A warp woven fabric using polyketone fiber for warp and a fiber yarn having a strength of 3.0 N or more and a breaking elongation of 5.5% or more for the weft. Weave fabric for carcass of pneumatic tires using cords made of glass fiber and spun yarn.   The interwoven fabric for a carcass of a pneumatic tire according to claim 1, wherein the spun yarn is a vinylon fiber or a cotton yarn. The weave fabric for a carcass of a pneumatic tire according to claim 1 or 2, further comprising a second tabby portion at a portion at least 50 cm away from the tabby portion on the main body side of the weave fabric .

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