KR20120039467A - Method for manufacturing tire carcass material and tire carcass material - Google Patents

Abstract

PURPOSE: A method for manufacturing a carcass material of a tire is provided to improve uniformity of the tire. CONSTITUTION: A method for manufacturing a carcass material of a tire comprises: a step of feeding a warp yarn arrangemen; a step of inserting weft yarn(3) forming carcass code in a perpendicular direction with the warp yarn; a step of attaching unvulcanized rubber on both sides of a fabric using a calendar roll; a step of passing the fabric through a pair of calendar rolls; a step of pressing the fabric by a pair of pressure rolls; and a step of penetrating the unvulcanized rubber between the weft yarn.

Description

The manufacturing method of the carcass material of a tire, and the carcass material of a tire {METHOD FOR MANUFACTURING TIRE CARCASS MATERIAL AND TIRE CARCASS MATERIAL}

The present invention relates to a method for producing a carcass material of a tire and to a carcass material of a tire which is excellent in productivity and helps to improve the uniformity of the tire.

In the carcass ply of the radial tire, the carcass cord is arranged at an angle of, for example, 80 to 90 degrees with respect to the tire equator. In order to manufacture such a carcass ply, for example, as shown in Fig. 8, a plurality of carcass cords (warp) b1 arranged in parallel are embedded between the carcass cords to prevent the carcass cords from scattering. The long primary ply p1 which covered the carcass material (fabric) (b) which consists of gin weft (b2) with the unvulcanized rubber (c) is used.

The primary ply p1 cannot be used as it is in the forming step as the carcass ply because the carcass cords b1 are arranged in parallel in the longitudinal direction. Therefore, in order to prepare a carcass ply, the primary ply p1 is cut at an angle g of 80 to 90 degrees with respect to its longitudinal direction and the width dimension w1 of the carcass ply, and the cut ply is cut. By joining the members f, a long carcass ply a in which the carcass cord b1 is arranged at said angle g with respect to the longitudinal direction is formed. In addition, the following documents are related (refer patent document 1 below).

Japanese Patent Laid-Open No. 2003-39574

However, in order to manufacture a carcass ply (a), as mentioned above, the process of cutting the primary ply p1 by the ply member f and the process of connecting the ply member f in the longitudinal direction are included. Therefore, there existed a problem that productivity was bad. Further, since the carcass ply a is formed by connecting the plurality of ply members f in the longitudinal direction, the stiffness difference between the joint portion m of each ply member f and other portions becomes excessive, There was a problem that the uniformity of the tire was likely to decrease.

SUMMARY OF THE INVENTION The present invention has been made in view of the above facts, and a process of supplying warp arrays in which warp yarns having a thickness of 250 dtex or less are arranged in parallel at intervals along the longitudinal direction of the carcass material, and the supplied warp arrays Incorporating a weft yarn made of a carcass cord having a width dimension of the carcass material in a direction orthogonal to the warp yarns to form a fabric, thereby increasing productivity and improving tire uniformity. It aims at providing the manufacturing method of the carcass material of a tire useful, and providing the carcass material of a tire.

The invention according to claim 1 of the present invention is a method for producing a carcass material of a long tire wound with a predetermined width and in a roll shape, wherein the warp yarn having a thickness of 250 dtex or less is parallel to each other along the longitudinal direction of the carcass material. Supplying the warp array arranged in such a manner, and forming a fabric by weaving a weft yarn made of a carcass cord having a width dimension of the carcass material in a direction orthogonal to the warp yarns of the supplied warp array. It is characterized by including.

The invention according to claim 2 further includes a topping step of attaching unvulcanized rubber to both surfaces of the fabric by using a calender roll, and in the topping step, the fabric is applied without tensioning the warp yarn. The conveyance process which conveys to a calender roll, the rubber adhesion process which passes the said fabric between a pair of calender rolls with the said unvulcanized rubber attached to the surface, and the said unvulcanized rubber adhered to both surfaces through the said calender roll. It is a manufacturing method of the carcass material of the tire of Claim 1 including the rubber permeation process which penetrates the said unvulcanized rubber between the said weft thread by crimping | bonding a rubber adhesion fabric with a pair of press rolls.

Moreover, invention of Claim 3 is a manufacturing method of the carcass material of the tire of Claim 2 whose said conveyance process is a conveyance speed of 120-200 mm / s.

In addition, in the invention described in claim 4, the warp yarns are arranged at intervals of 2 to 8 mm in the pair of outer regions in the range of 30 mm inward from both ends in the width direction thereof. It is a manufacturing method of the carcass material of the tire in any one of Claims 1-3 in which the said warp yarns are arrange | positioned at intervals of 150-200 mm in an inner side area | region between them.

Moreover, the invention of Claim 5 is the manufacturing method of the carcass material of the tire in any one of Claims 1-4 with which the said width | variety of the said fabric is the same as the width of the carcass ply of the tire to be shape | molded.

In addition, the invention according to claim 6 is made of a fabric comprising a warp yarn extending in parallel in the longitudinal direction and a weft yarn extending in a direction substantially perpendicular to the warp yarn, wherein the warp yarn has a thickness of 250 dtex or less, The weft is composed of a carcass cord having a width dimension of the carcass material, and the warp yarn is 2 to 8 mm in a pair of outer regions in the range of 30 mm inwardly from both ends in the width direction thereof. The warp yarns are arranged at intervals of, and the warp yarns are arranged at intervals of 150 to 200 mm in the inner region between the outer regions.

The method for producing a carcass material of the present invention comprises the steps of supplying warp arrays arranged in parallel with intervals of warp yarns having a thickness of 250 dtex or less along the longitudinal direction of the carcass material; A step of weaving a weft made of a carcass cord having a width dimension of the carcass material in the orthogonal direction to form a fabric.

In such a manufacturing method, since the carcass cord of a carcass material is arrange | positioned in the direction orthogonal to a longitudinal direction, after covering a carcass material with unvulcanized rubber, the carcass material is 80 to a longitudinal direction like conventionally. By cutting with a plurality of ply members at an angle of? 90 degrees, a carcass ply can be formed without connecting them in the longitudinal direction, thereby improving the productivity of the radial tire.

In addition, the carcass ply formed of such carcass material can minimize the joint portion in the tire circumferential direction to help improve the uniformity of the tire.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which shows the carcass material of the tire of this embodiment.
2 is a sectional view taken along the line AA in Fig.
3 is a side view conceptually showing a manufacturing apparatus used in the manufacturing method of the present embodiment.
4 is an enlarged perspective view showing the seedling frame and the nozzle.
5 is a front view of a heald frame.
6 is a side view conceptually illustrating a calender roll and a pressing roll.
7 is a perspective view illustrating a carcass material of Comparative Example 2. FIG.
8 is a plan view illustrating a conventional step of forming a carcass ply.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

The carcass material (hereinafter, simply referred to as "carcass material") 1 of the tire of this embodiment is used for the carcass ply of a radial tire.

1 and 2, the carcass material 1 includes a warp yarn 2 extending in parallel in the longitudinal direction and a weft yarn 3 extending in a direction substantially perpendicular to the warp yarn 2. Made of fabric 1A. In the fabric 1A of the present embodiment, so-called double warping is formed by weaving one or more of the adjacent warp yarns 2 so that the weft yarns 3 pass through the top and bottom of the warp yarns 2.

The warp yarn 2 consists of a thin thread whose thickness is 250 dtex or less. As the warp yarn 2, for example, cotton or polynosic (flat rayon) or the like is appropriately employed.

As the weft 3, a carcass cord 3A for a tire having a length W1 of the width dimension of the carcass material 1 is used. The carcass cord 3A includes, for example, a so-called textile cord obtained by combining a plurality of filaments made of organic fibers such as nylon, rayon, polyester, and aramid, a multifilament cord obtained by combining a plurality of steel filaments, and the like. Is adopted and is thicker than the warp yarn 2.

The method of manufacturing such carcass material 1 is demonstrated.

In the manufacturing method of this embodiment, the manufacturing apparatus 11 shown in FIG. 3 is used. The manufacturing apparatus 11 includes a krill stand 12 in which a plurality of krills 12c wound up the warp yarns 2 are arranged in multiple rows and in multiple stages, and the warp yarns 2 supplied from the krill stand 12. In parallel with the inserter 13, a tension stand 14 for applying a constant tension to the warp yarns 2 arranged by the inserter 13, and a warp yarn supplied from the tension stand 14 ( Winder for winding the weaving yarn 3 into a loom 15 to form a woven fabric 1A having a predetermined width and elongate shape, and a rolled woven fabric 1A woven from the loom 15. (16).

The loom 15 of this embodiment consists of a well-known air jet loom, for example. As shown in Fig. 3 and Fig. 4, the loom 15 holds a warp yarn 2 and a pair of heald frames 18 capable of vertically moving in opposite directions and a weft thread cut to the length W1. It comprises the nozzle part 19 which incorporates 3 into the warp thread 2 by injection of high pressure air.

As shown in FIG. 5, the pair of heald frames 18 of the present embodiment has a frame portion 18A formed in a substantially rectangular shape and each warp yarn 2 (FIG. 4) in the frame portion 18A. And a plurality of seed lights 18B spaced apart in the horizontal direction (the width direction of the fabric) of the frame portion 18A. This seed light 18B has a hole portion 18Ba for passing the warp yarn 2 in the longitudinal direction of the carcass material 1 at an approximately intermediate position in the vertical direction of the frame portion 18A, and the hole portion 18Ba. ) And a pair of support portions 18Bb and 18Bb that extend up and down and are fixed to the picture frame portion 18A.

In addition, as shown in FIG. 4, the warp yarns 2 adjacent to the width direction are hold | maintained in the other heald frame 18, respectively. As a result, the adjacent warp yarns 2 are alternately guided in the vertical direction by the vertical movement of the pair of healds 18 in opposite directions.

And in the manufacturing method of this embodiment, the process of supplying the warp array 4 which arranged the warp yarn 2 along the longitudinal direction of the carcass material 1, and the warp of the supplied warp array 4 And weaving the weft yarn 3 in a direction orthogonal to (2) to form the fabric 1A.

In the step of supplying the warp array 4, as shown in FIGS. 3 and 4, the warp yarn 2 supplied from the plurality of krills 12c through the inserter 13 is loom 15. It is kept in the heald frame 18. Specifically, the warp yarns 2 adjacent to each other in the width direction are passed through and held by the heald 18B of the different heald frames 18 and 18, respectively. Thereby, the said warp array 4 which arranges the warp yarn 2 in parallel at intervals is formed.

Further, the warp yarns 2 adjacent to each other in the width direction are held in different healds 18 and 18, respectively, so that the hefts 18 and 18 are moved up and down alternately by vertical movement in the opposite directions.

Moreover, in the process of forming the said fabric 1A, the opening 7 is formed between the upper and lower warp yarns 2 by the up-and-down movement of the adjacent warp yarns 2, and the high pressure supplied from the nozzle part 19 is carried out. By the injection of air, the weft thread 3 made of the carcass cord 3A cut to a predetermined length passes through the opening 7. In this manner, the weft yarns 3 pass through the openings 7 while vertically moving the heald frames 18 and 18 in opposite directions to each other, whereby a double-view cloth 1A is formed. And this fabric 1A is wound up by a winder 16 one by one in a reel etc. one by one.

In this manufacturing method, the fabric 1A in which the carcass cord 3A is arranged in the direction orthogonal to the longitudinal direction of the carcass material 1 is formed. For this reason, in the manufacturing method of this embodiment, by the topping process mentioned later, the primary ply 1P (shown in FIG. 6) with unvulcanized rubber R adhere | attached on both surfaces of the fabric 1A is conventionally compared with the conventional method. Similarly, it can be used as a carcass ply without cutting into several ply members (not shown) and connecting them in the longitudinal direction, and can raise productivity.

In addition, the carcass ply formed by the fabric 1A can suppress the joint portion formed by connecting the ply member or the like in the tire circumferential direction to a minimum, and therefore, the rigid difference can be suppressed in the tire circumferential direction. It helps to improve tire uniformity.

In addition, since the thickness of the warp yarn 2 is limited to 250 dtex or less, excessive restraint of the weft yarn 3 can be suppressed while suppressing scattering of the weft yarn 3, thereby improving the uniformity of the tire. have. In order to exhibit such an effect effectively, the thickness of the warp yarn 2 becomes like this. Preferably it is 210 dtex or less, More preferably, it is 170 dtex or less.

In the warp array 4, the warp yarns 2 have an interval of 2 to 8 mm in a pair of outer regions To within a range of 30 mm from both ends 4t and 4t in the width direction. It is preferable to arrange | position at the space | interval W3 of 150-200 mm in the inner side area | region Ti arrange | positioned at W2) and arrange | positioned between the outer side area To and also in the vicinity of the tread part of a tire.

The fabric 1A formed by such a warp array 4 tends to be scattered at both ends in the width direction thereof, but as shown in FIG. 1, by setting the density of the warp yarns 2 at both ends thereof as high, The scattering of (3) can be effectively suppressed. In addition, in the inner region Ti, the density of the warp yarns 2 is set to be low, so that the weft yarns 3 are excessively restrained by the warp yarns 2 near the tread portion during vulcanization and internal pressure filling. It is possible to reliably prevent this from happening, which can greatly improve the tire uniformity.

In order to exhibit such an effect effectively, the said space | interval W2 in outer side area To becomes like this. Preferably it is 3 mm or more. When the said space | interval W2 is too small, the density of the warp yarn 2 will become excessively high on both sides of the width direction of the fabric 1A, and there exists a possibility that the uniformity of a tire may deteriorate. On the contrary, when the said space | interval W2 is too big | large, there exists a possibility that the dispersion | variation of the weft 3 cannot fully be suppressed. In view of this, the interval W2 is preferably 6 mm or less.

Moreover, according to the same viewpoint, the said space | interval W3 in inner side area Ti becomes like this. Preferably it is 150 mm or more, Preferably it is 180 mm or less.

In addition, as described above, the warp array 4 is formed as shown in FIG. 5, and each of the heald 18B of the heald frame 18 is separated from the intervals W2 and W3 of the warp yarn 2. By arranging them in the same way, they can be easily realized.

The length W1 of the carcass cord 3A is preferably set equal to the width dimension of the carcass ply. Accordingly, the primary ply 1P (shown in FIG. 6) can be used as a carcass ply as it is without being cut to the width dimension of the carcass ply, so that the primary ply 1P (shown in FIG. 6) can be improved significantly. .

In the manufacturing method of this embodiment, a topping process is further included. In this topping step, after the fabric 1A is wound into a roll by the winder 16, as shown in FIG. 6, the unvulcanized rubber R is used by using the calender rolls 21 on both sides of the fabric 1A. ) Is attached and the primary ply 1P is formed.

The calender roll 21 is configured to include an upper calender roll 21A arranged above the fabric 1A and a lower calender roll 21B arranged below the fabric 1A. The upper and lower calender rolls 21A and 21B have a rotation axis parallel to the width direction of the fabric 1A.

The upper calender roll 21A has an upper inner roll 21Aa rolling on the upper surface of the fabric 1A and an upper outer roll relatively rotating with a gap S above the upper inner roll 21Aa. It is comprised including 21Ab, and the unvulcanized rubber R is supplied between these rolls 21Aa and 21Ab. This unvulcanized rubber R is a sheet-like sheet having a width substantially equal to that of the fabric 1A from the gap S between the rolls 21Aa and 21Ab by the relative rotation of the upper inner roll 21Aa and the upper outer roll 21Ab. And discharged along the surface of the upper inner roll 21Aa.

The lower calender roll 21B has the same configuration as the upper calender roll 21A, and includes a lower inner roll 21Ba and a lower outer roll 21Bb which are rolling on the lower surface of the fabric 1A. It is comprised and the unvulcanized rubber R is supplied between these rolls 21Ba and 21Bb. The unvulcanized rubber R is discharged in a sheet form from the gap S, and adheres along the surface of the lower inner roll 21Ba.

As the unvulcanized rubber (R), diene rubbers such as natural rubber, isoprene rubber, butadiene rubber, styrene butadiene rubber are suitable from the viewpoint of adhesiveness with the weft 3, elastic properties and the like. These diene rubbers are used alone or in combination of two or more thereof.

And in the said topping process, it passes between the conveyance process which conveys the fabric 1A to the calender roll 21, and a pair of calender roll 21 with unvulcanized rubber R attached to the surface of the fabric 1A. Rubber adhering process, and rubber impregnation process in which the unvulcanized rubber R is infiltrated between the weft yarn 3 (shown in FIG. 1).

In the conveyance process of this embodiment, the rolled fabric 1A is rewound and, for example, placed on the roller conveyor 22 without applying a substantial tension to the fabric 1A, and the pair of calender rolls 21 are provided. Is returned. In this way, by not substantially applying tension to the fabric 1A, as shown in Fig. 2, the weft yarns 3 are positioned substantially in the same plane, while the warp yarns 2 are zigzagly interwoven therebetween. Can be maintained.

In the said rubber adhesion process, as shown in FIG. 6, on both surfaces of the fabric 1A, the upper inner roll 21Aa and the lower inner roll 21Ba with the sheet-shaped unvulcanized rubber R attached to the surface are rolling. By doing so, a rubber-attached fabric 1Ag having unvulcanized rubber R adhered to the upper and lower surfaces of the fabric 1A is formed.

In the rubber penetration process, the unvulcanized rubber R is infiltrated between the weft yarns 3 (shown in FIG. 1) by pressing the rubber adhesive fabric 1Ag with a pair of pressing rolls 23 and 23, and the primary Ply 1P is formed.

In this way, in the topping process, since the fabric 1A is guided to the calender roll 21 without tension, the warp yarn 2 is prevented from being elongated and the elongation of the weft yarn 3 is prevented. It is possible to suppress the disturbance in the longitudinal direction of the fabric 1A. Therefore, in the topping process of this embodiment, the unvulcanized rubber R can be infiltrated with the number of wefts 3 uniformly maintained in the longitudinal direction of the fabric 1A, and the tire uniformity is greatly increased. Can be improved.

In addition, in this embodiment, since the adhesion of the unvulcanized rubber R to the fabric 1A and the pressing of the unvulcanized rubber R are performed in separate processes, the tension is not applied to the fabric 1A. Even when pressed by the pressing rolls 23 and 23 in the state, the so-called thread spreading which increases the spacing between the warp yarns 2 and the weft yarns 3 can be suppressed, and the variation in the number of feeding of the weft yarns 3 can be effectively suppressed. Can be.

In addition, in the topping process of this embodiment, since the unvulcanized rubber R penetrates without tensioning the fabric 1A, the primary ply 1P is used without using a device, such as a tension controller, conventionally. ) Can be formed, and the manufacturing equipment can be downsized.

It is preferable that the said conveyance process is set to 120-200 mm / s whose conveyance speed is slower than before. Thereby, even if the tension | tensile_strength is not applied to the cloth 1A, the elongation of the warp yarn 2 and the fluctuation | variation of the weft 3 can be effectively prevented, and the uniformity of a tire can be improved reliably.

In order to exhibit such an effect effectively, a conveyance speed becomes like this. Preferably it is 150 mm / s or more. If the conveyance speed is too small, the topping process may take too long, resulting in deterioration of productivity. On the contrary, when the said conveyance time is too long, there exists a possibility that the elongation of the warp yarn 2 and the fluctuation | variation of the weft yarn 3 may not be prevented fully. From this point of view, the conveyance speed is preferably 180 mm / s or less.

As mentioned above, although especially preferable embodiment of this invention was described in detail, this invention can be modified and implemented in various aspects, without being limited to embodiment shown in figure.

[Example]

Using the manufacturing apparatus shown in FIG. 3 and FIG. 4, weft yarns made of a carcass cord are interwoven into warp arrays in which warp yarns are arranged in parallel at intervals to form a carcass material, and topping The primary ply was formed by the process. Using the primary ply as a carcass ply, a pneumatic tire was produced and the performance thereof was evaluated.

In addition, as a comparison, as shown in FIG. 8, the primary plies in which the carcass cords are arranged in parallel in the longitudinal direction are cut at an angle of 80 to 90 degrees with respect to the longitudinal direction and in the width dimension of the carcass ply, The pneumatic tire was manufactured using the carcass ply formed by connecting this cut ply member, and the performance was evaluated. In addition, the common specification is as follows.

Tire size: 195 / 65R15

Rim Size: 15 × 6JJ

Width dimension of carcass ply: 533 mm

Warp Cord Material: Accordion 24

Weft (Carcass Code):

Cord Material: Polyester

Thickness: 1670 dtex

The test method is as follows.

Productivity

The manufacturing time per tire was measured, and the comparative example 1 was represented by the index made into 100. The smaller the value, the shorter the production time, and the better the productivity.

<Uniformity of tire>

Based on the uniformity measurement method of JASO C607, a low-speed RFV and a high-speed TFV of each of the 50 tires were measured using a uniformity machine, and respective average values and standard deviations were obtained. The result was made into the exponent which makes the average value and standard deviation of the comparative example 1 100. The smaller the value, the higher and better the tire uniformity.

The results of the test are shown in Table 1.

As a result of the test, the manufacturing method and the carcass material of the Example were excellent in productivity, and it was confirmed that the tire uniformity was improved.

1: carcass material
2: warp
3: weft
4: warp arrangement

Claims (6)

As a method of manufacturing a carcass material of a long tire wound in a roll shape with a predetermined width,
Supplying a warp arrangement in which warp yarns having a thickness of 250 dtex or less are arranged in parallel at intervals along the longitudinal direction of the carcass material;
A step of weaving a weft comprising a carcass cord having a width dimension of the carcass material in a direction orthogonal to the warps of the supplied warp array to form a fabric
Method for producing a carcass material of the tire comprising a. The method of claim 1, further comprising a topping process of attaching unvulcanized rubber to both sides of the fabric using a calender roll,
In the said topping process, The conveyance process of conveying the said fabric to the said calender roll, without applying tension to the said warp thread,
A rubber adhesion process of passing the fabric through a pair of calender rolls having the unvulcanized rubber attached to a surface thereof;
A carcass material of a tire comprising: a rubber penetration process of infiltrating the unvulcanized rubber between the wefts by pressing the rubber attachment fabric having the unvulcanized rubber attached to both sides through the calender roll with a pair of pressing rolls. Method of preparation. The said conveyance process is a manufacturing method of the carcass material of a tire of Claim 2 whose conveyance speed is 120-200 mm / s. The warp fabric according to any one of claims 1 to 3, wherein the warp yarns are arranged at intervals of 2 to 8 mm in a pair of outer regions that are in a range of 30 mm inwardly from both ends in the width direction thereof. ,
In the inner region between the outer regions, the warp yarns are arranged at intervals of 150 to 200 mm. The method of manufacturing a carcass material of a tire according to any one of claims 1 to 3, wherein the width of the fabric is equal to the width of the carcass ply of the tire being molded. A carcass material of a tire comprising a fabric having a warp yarn extending in parallel in the longitudinal direction and a weft thread extending in a direction perpendicular to the warp yarn,
The warp thread is 250 dtex or less in thickness,
The weft consists of a carcass cord having a width dimension of the carcass material,
In the fabric, the warp yarns are arranged at intervals of 2 to 8 mm in a pair of outer regions within a range of 30 mm from both ends in the width direction thereof, and in the inner region between the outer regions, the warp yarns are Carcass material of a tire characterized by being arranged at intervals of 150 to 200 mm.

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