JP5276641B2 - Manufacturing method of tire carcass material and tire carcass material - Google Patents

Description

  The present invention relates to a method for manufacturing a tire carcass material that is excellent in productivity and useful for improving tire uniformity and a tire carcass material.

  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 yarns) b1 arranged in parallel and the carcass cords are interwoven to prevent the carcass cords from being scattered. A long primary ply p1 in which a carcass material (woven fabric) b composed of the weft yarn b2 is covered with an unvulcanized rubber c is used.

  The primary ply p1 cannot be used as a carcass ply in the molding process because the carcass cord b1 is arranged in parallel to the longitudinal direction. For this reason, 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 the longitudinal direction and the width dimension w1 of the carcass ply, and the cut ply pieces f are connected. Thus, a long carcass ply a in which the carcass cord b1 is arranged at the angle g with respect to the longitudinal direction is formed. Related documents include the following (see Patent Document 1 below).

JP 2003-39574 A

  However, since the carcass ply a includes the steps of cutting the primary ply p1 into the ply pieces f and the step of connecting the ply pieces f in the length direction as described above, the productivity is poor. There was a problem. Further, since the carcass ply a is formed by connecting a plurality of ply pieces f in the length direction, the difference in rigidity between the joint portion m of each ply piece f and the other portions becomes excessive, and the tire uniformity is increased. There was a problem that it was easily lowered.

  The present invention has been devised in view of the actual situation as described above, and a step of supplying a warp array in which warp yarns having a thickness of 250 dtex or less are arranged in parallel along the longitudinal direction of the carcass material at intervals. And a step of weaving a weft made of a carcass cord having a width dimension of a carcass material in a direction orthogonal to the warp of the supplied warp array, and forming a woven fabric. The main object of the present invention is to provide a method for manufacturing a tire carcass material and a tire carcass material useful for improving tire uniformity.

  The invention according to claim 1 of the present invention is a method for producing a carcass material for a long tire that is wound in a roll shape with a constant width, wherein the thickness of the carcass material is increased along the longitudinal direction of the carcass material. A step of supplying a warp array in which warps of 250 dtex or less are arranged in parallel at intervals, and a carcass cord having a width dimension of the carcass material in a direction orthogonal to the warps of the supplied warp array And a step of weaving a weft to form a woven fabric.

  The invention according to claim 2 further includes a topping step of attaching unvulcanized rubber to both surfaces of the fabric using a calender roll, and in the topping step, the fabric is not tensioned on the warp. A transporting process for transporting to the calender roll; a rubberizing process for passing the fabric through a pair of calender rolls having the unvulcanized rubber adhered to the surface; and the unvulcanized on both sides through the calender roll. 2. A method for producing a carcass material for a tire according to claim 1, further comprising a rubber infiltration step in which the unvulcanized rubber is infiltrated between the weft yarns by narrowing a rubber-woven fabric to which rubber is adhered with a pair of pressing rolls.

  The invention according to claim 3 is the method for producing a carcass material for a tire according to claim 2, wherein the conveying step has a conveying speed of 120 to 200 mm / s.

  According to a fourth aspect of the present invention, in the fabric, the warp yarns are arranged at intervals of 2 to 8 mm in a pair of outer regions that are 30 mm inward from both ends in the width direction. The method for producing a carcass material for a tire according to any one of claims 1 to 3, wherein the warp yarns are arranged at intervals of 150 to 200 mm in the inner region.

The invention of claim 5, wherein, the width of the fabric, Ri manufacturing method der carcass material of a tire according to any one of equal to the width of the carcass ply of the tire being molded claims 1 to 4, The invention according to claim 6 uses a loom comprising a pair of reed frames that hold the warp and can move up and down in opposite directions, and a nozzle portion that weaves the weft into the warp by high-pressure air injection. The warp yarns adjacent to each other in the width direction are held in the different heel frames, and are alternately guided in the vertical direction by the vertical movements of the pair of heel frames in opposite directions to form the woven fabric. Is a method of manufacturing a carcass material for a tire according to any one of claims 1 to 5, wherein the weft yarn is passed from the nozzle portion to an opening formed between the warp yarns that are alternately guided in the vertical direction.

The invention according to claim 7 is a tire carcass material in which a woven fabric including warp yarns extending parallel to the longitudinal direction and weft yarns extending in a direction perpendicular to the warp yarns is wound in a roll shape along the warp yarns. a is, the warp yarns, with its thickness is less than 250Dtex, the weft, the characterized in that it consists of a carcass cord having a width of the carcass material, the invention of claim 8, wherein In the woven fabric, the warp yarns are arranged at intervals of 2 to 8 mm in a pair of outer regions that are 30 mm inward from both ends in the width direction, and the warp yarns are 150 to 200 mm in the inner region between the outer regions. The tire carcass material according to claim 7, which is arranged at intervals of

  The method for producing a carcass material according to the present invention includes a step of supplying a warp array in which warps having a thickness of 250 dtex or less are arranged in parallel along the longitudinal direction of the carcass material, and a Forming a woven fabric by weaving a weft yarn made of a carcass cord having a width dimension of a carcass material in a direction orthogonal to the warp yarn.

  In such a manufacturing method, since the carcass cord of the carcass material is arranged in a direction perpendicular to the longitudinal direction, after the carcass material is coated with unvulcanized rubber, the carcass material is moved in the longitudinal direction as in the past. On the other hand, it is possible to form a carcass ply without cutting them into a plurality of ply pieces at an angle of 80 to 90 degrees and connecting them in the longitudinal direction, thereby improving the productivity of the radial tire.

  Further, the carcass ply formed of such a carcass material can minimize the joint portion in the tire circumferential direction, and helps to improve the tire uniformity.

It is a perspective view which shows the carcass material of the tire of this embodiment. It is AA sectional drawing of FIG. It is a side view which shows notionally the manufacturing apparatus used with the manufacturing method of this embodiment. It is a perspective view which expands and shows a collar frame and a nozzle. It is a front view of a fence frame. It is a side view which shows a calendar roll and a control roll notionally. It is a perspective view which shows the carcass material of the comparative example 2. It is a top view explaining the formation process of the conventional carcass ply.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
A tire carcass material (hereinafter simply referred to as “carcass material”) 1 of the present embodiment is used for a carcass ply of a radial tire.

  As shown in FIGS. 1 and 2, the carcass material 1 is made of a woven fabric 1 </ b> A including warp yarns 2 extending parallel to the longitudinal direction and weft yarns 3 extending in a direction substantially perpendicular to the warp yarns 2. The fabric 1A according to the present embodiment is so-called knot weaving in which every other adjacent warp 2 is woven so that the weft 3 passes above and below the warp 2.

  The warp yarn 2 is made of a fine yarn having a thickness of 250 dtex or less. For example, cotton or polynosic (flat rayon) is suitably used for the warp yarn 2.

  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. For this carcass cord 3A, for example, a so-called textile cord in which a plurality of filaments made of organic fibers such as nylon, rayon, polyester, and aramid are twisted, a multifilament cord in which a plurality of steel filaments are twisted, and the like are adopted. Thicker than the warp yarn 2.

A method for manufacturing such a carcass material 1 will be described.
In the manufacturing method of the present embodiment, a manufacturing apparatus 11 shown in FIG. 3 is used. The manufacturing apparatus 11 includes a creel stand 12 in which a plurality of creels 12c around which the warp yarns 2 are wound are arranged in multiple rows and in multiple stages, an inserter 13 for arranging the warp yarns 2 supplied from the creel stand 12 in parallel, A tension stand 14 for applying a constant tension to the warp yarns 2 arranged by the inserter 13, and a loom 15 for weaving the weft yarn 3 into the warp yarn 2 supplied from the tension stand 14 to form a fabric 1A having a constant width and a long shape. And a winder 16 that winds the fabric 1A woven by the loom 15 into a roll.

  The loom 15 of the present embodiment is, for example, a known air jet loom. As shown in FIGS. 3 and 4, the loom 15 includes a pair of reed frames 18 that hold the warp 2 and can move up and down in opposite directions, and the weft 3 that has been cut at the length W <b> 1. And a nozzle portion 19 that is woven into the warp yarn 2 by jetting.

  As shown in FIG. 5, the pair of hook frames 18 of the present embodiment holds a frame portion 18A formed in a substantially rectangular shape and each warp thread 2 (shown in FIG. 4) within the frame portion 18A. The frame portion 18A includes a plurality of ridges 18B provided in the horizontal direction (the width direction of the fabric). The flange 18B has a hole 18Ba that allows the warp yarn 2 to pass in the longitudinal direction of the carcass material 1 at a substantially intermediate position in the vertical direction of the frame 18A, and a pair that extends vertically from the hole 18Ba and is fixed to the frame 18A. Support portions 18Bb and 18Bb.

  Further, as shown in FIG. 4, the warp yarns 2 adjacent in the width direction are held by different heel frames 18. As a result, the adjacent warp yarns 2 are alternately guided in the vertical direction by the vertical movements of the pair of reed frames 18 in opposite directions.

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

  In the step of supplying the warp array 4, as shown in FIGS. 3 and 4, the warp 2 supplied from the plurality of creels 12 c through the inserter 13 is held in the reed frame 18 of the loom 15. Specifically, the warp yarns 2 adjacent to each other in the width direction are held through the hooks 18B of the different hook frames 18 and 18, respectively. Thereby, the warp yarn array 4 in which the warp yarns 2 are arranged in parallel at intervals is formed.

  Further, the warp yarns 2 adjacent to each other in the width direction are held by different heel frames 18 and 18, and are therefore moved up and down alternately by the vertical movements of the heel frames 18 and 18 in opposite directions.

  Further, in the step of forming the woven fabric 1A, an opening 7 is formed between the upper and lower warp yarns 2 by alternately moving up and down adjacent warp yarns 2, and a predetermined length is obtained by injection of high-pressure air supplied from the nozzle portion 19. The weft 3 made of the carcass cord 3A that has been cut is passed through the opening 7. In this way, the weft 3 is passed through the opening 7 while the heel frames 18 and 18 are moved up and down in opposite directions, whereby the woven fabric 1A is formed. The fabric 1A is sequentially wound around a reel or the like by a winder 16.

  In such a manufacturing method, the woven fabric 1 </ b> A in which the carcass cord 3 </ b> A is arranged in a direction orthogonal to the longitudinal direction of the carcass material 1 is formed. For this reason, in the manufacturing method of the present embodiment, the primary ply 1P (shown in FIG. 6) in which the unvulcanized rubber R is adhered to both surfaces of the fabric 1A is converted into a plurality of plies as in the prior art by a topping process described later. It can be used as a carcass ply without cutting into pieces (not shown) and connecting them in the longitudinal direction, and productivity can be improved.

  Moreover, since the carcass ply formed by such a woven fabric 1A can minimize the joint portion in which the ply pieces and the like are connected in the tire circumferential direction, the rigidity difference in the tire circumferential direction can be suppressed. Helps improve tire uniformity.

  Furthermore, by limiting the thickness of the warp yarn 2 to 250 dtex or less, it is possible to suppress the weft yarn 3 from being excessively restrained while suppressing the weft yarn 3 from being scattered, and to improve the tire uniformity. In order to effectively exert such an action, the thickness of the warp 2 is preferably 210 dtex or less, more preferably 170 dtex or less.

  The warp yarn array 4 is arranged such that the warp yarns 2 are arranged at intervals W2 of 2 to 8 mm in a pair of outer regions To that are 30 mm inward from both ends 4t and 4t in the width direction, and the outer region To In the inner region Ti disposed between and in the vicinity of the tread portion of the tire, it is preferably arranged at an interval W3 of 150 to 200 mm.

  The fabric 1A formed by such warp array 4 is likely to be scattered at both ends in the width direction. However, as shown in FIG. 1, by setting the density of the warp 2 at both ends to be high, the weft 3 can be effectively suppressed. Furthermore, since the density of the warp yarn 2 is set low in the inner region Ti, it is reliably prevented that the weft yarn 3 is excessively restrained by the warp yarn 2 in the vicinity of the tread portion at the time of vulcanization molding and internal pressure filling, Tire uniformity can be greatly improved.

  In order to effectively exhibit such an action, the interval W2 in the outer region To is preferably 3 mm or more. If the distance W2 is too small, the density of the warp yarns 2 is excessively increased on both sides in the width direction of the fabric 1A, and the tire uniformity may be deteriorated. On the other hand, if the interval W2 is too large, the looseness of the weft 3 may not be sufficiently suppressed. From such a viewpoint, the interval W2 is preferably 6 mm or less.

  Further, from the same viewpoint, the interval W3 in the inner region Ti is preferably 150 mm or more, and preferably 180 mm or less.

  In order to form the warp array 4 as described above, as shown in FIG. 5, the hooks 18 </ b> B of the hook frame 18 are easily arranged to be equal to the intervals W <b> 2 and W <b> 3 of the warp 2. realizable.

  The length W1 of the carcass cord 3A is preferably set equal to the width dimension of the carcass ply. As a result, the primary ply 1P (shown in FIG. 6) can be used as it is as a carcass ply as long as the length of the primary ply 1P (shown in FIG. 6) is equal to the width of the carcass ply, and productivity can be greatly improved.

  The manufacturing method of this embodiment further includes a topping step. In this topping process, after the woven fabric 1A is wound into a roll by the winder 16, as shown in FIG. 6, unvulcanized rubber R is adhered to both surfaces of the woven fabric 1A using the calender roll 21, and the primary A ply 1P is formed.

  The calendar roll 21 includes an upper calendar roll 21A disposed on the upper side of the fabric 1A and a lower calendar roll 21B disposed on the lower side of the fabric 1A. The upper and lower calendar rolls 21A and 21B have a rotation axis parallel to the width direction of the fabric 1A.

  The upper calendar roll 21A includes an upper inner roll 21Aa that rolls on the upper surface of the fabric 1A, and an upper outer roll 21Ab that rotates relative to the upper roll 21Aa with a gap S therebetween. The unvulcanized rubber R is supplied between these rolls 21Aa and 21Ab. The unvulcanized rubber R is discharged from the gap S between the rolls 21Aa and 21Ab into a sheet having substantially the same width as the fabric 1A by the relative rotation of the upper inner roll 21Aa and the upper outer roll 21Ab. It adheres along the surface of 21Aa.

  The lower calendar roll 21B has the same configuration as the upper calendar roll 21A, and includes a lower inner roll 21Ba that rolls on the lower surface of the fabric 1A, and a lower outer roll 21Bb. Unvulcanized rubber R is supplied between the 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.

  The unvulcanized rubber R is preferably a diene rubber such as natural rubber, isoprene rubber, butadiene rubber, styrene / butadiene rubber, etc., as in the past, from the viewpoint of adhesiveness with the weft 3 and elastic properties. These diene rubbers are used alone or in combination.

  And in the topping step, a conveying step for conveying the fabric 1A to the calender roll 21, a rubberizing step for passing between a pair of calender rolls 21 with the unvulcanized rubber R attached to the surface of the fabric 1A, and an unvulcanized A rubber infiltration step in which the rubber R is infiltrated between the weft yarns 3 (shown in FIG. 1).

  In the transporting process of the present embodiment, the roll-shaped fabric 1A is unwound and placed on the roller conveyor 22 and transported to the pair of calendar rolls 21 without applying substantial tension to the fabric 1A. Is done. Thus, by not applying substantial tension to the fabric 1A, as shown in FIG. 2, the weft 3 is positioned substantially in the same plane while the warp 2 is woven in a zigzag manner between them. Can maintain the state.

  In the rubber attaching step, as shown in FIG. 6, the upper inner roll 21 </ b> Aa and the lower inner roll 21 </ b> Ba having the sheet-like unvulcanized rubber R attached to the surface are rolled on both surfaces of the fabric 1 </ b> A. The rubber-woven fabric 1Ag with the unvulcanized rubber R attached to the upper and lower surfaces of the fabric 1A is formed.

  In the rubber infiltration step, the unwoven rubber R is infiltrated between the weft yarns 3 (shown in FIG. 1) by narrowing the woven fabric 1Ag with a pair of pressing rolls 23, 23, thereby forming the primary ply 1P. .

  In this way, in the topping process, the fabric 1A is guided to the calendar roll 21 without being tensioned, so that the warp yarn 2 that is thin and relatively easy to stretch is prevented from being stretched. Variation in the longitudinal direction can be suppressed. Therefore, in the topping process of the present embodiment, the unvulcanized rubber R can be infiltrated while keeping the number of wefts 3 driven in the longitudinal direction of the woven fabric 1A, and the uniformity of the tire can be greatly improved.

  Moreover, in this embodiment, since the adhesion of the unvulcanized rubber R to the fabric 1A and the narrow pressure of the unvulcanized rubber R are performed in separate steps, the fabric 1A is not tensioned. Thus, even when the pressure is reduced by the pressing rolls 23, 23, so-called yarn opening in which the distance between the warp 2 and the weft 3 is increased can be suppressed, and variation in the number of driven wefts 3 can be effectively suppressed.

  Furthermore, in the topping process of this embodiment, since the unvulcanized rubber R is permeated without applying tension to the fabric 1A, the primary ply 1P can be formed without using a device such as a tension controller as in the prior art. Therefore, the manufacturing equipment can be downsized.

  In the transporting process, it is preferable that the transporting speed is set to 120 to 200 mm / s which is slower than the conventional speed. Thereby, even in a state where no tension is applied to the woven fabric 1A, it is possible to effectively prevent the warp yarn 2 from being stretched and the weft yarn 3 from being dispersed, and the tire uniformity can be reliably improved.

  In order to effectively exhibit such an action, the conveyance speed is preferably 150 mm / s or more. If the conveying speed is too low, the topping process takes an excessive amount of time, and productivity may be deteriorated. On the other hand, if the conveyance time is too long, the elongation of the warp yarn 2 and the variation of the weft yarn 3 may not be sufficiently prevented. From such a viewpoint, the conveyance speed is preferably 180 mm / s or less.

  As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect.

  3 and 4 is used to form a carcass material by weaving weft yarns made of carcass cords in a warp yarn array in which warp yarns are arranged parallel to each other at intervals, to form a carcass material. A primary ply was formed by the process. Using the primary ply as a carcass ply, a pneumatic tire was manufactured and its performance was evaluated.

Further, as a comparison, as shown in FIG. 8, the primary ply in which the carcass cords are arranged in parallel to the longitudinal direction is cut at an angle of 80 to 90 degrees with respect to the longitudinal direction and the width dimension of the carcass ply. A pneumatic tire was manufactured using a carcass ply formed by connecting the cut ply pieces, and its performance was evaluated. The common specifications are as follows.
Tire size: 195 / 65R15
Rim size: 15 × 6JJ
Carcass ply width: 533mm
Cord material for warp: Accordion 24
Weft (carcass cord):
Cord material: Polyester Thickness: 1670 dtex
The test method is as follows.

<Productivity>
The production time per tire was measured and displayed as an index with Comparative Example 1 as 100. The smaller the value, the shorter the manufacturing time and the better the productivity.

<Tire uniformity>
Based on the uniformity measurement method of JASO C607, the low speed RFV and the high speed TFV of 50 tires were measured using a uniformity machine, and the average value and the standard deviation were obtained. The result was an index with the average value and standard deviation of Comparative Example 1 as 100. The smaller the number, the higher the tire uniformity and the better.
The test results are shown in Table 1.

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

1 carcass material 2 warp 3 weft 4 warp array

Claims (8)

A method of producing a carcass material for a long tire that is wound into a roll with a constant width,
Supplying a warp array in which warps of 250 dtex or less in thickness are arranged in parallel along the longitudinal direction of the carcass material;
Including a step of weaving a weft made of a carcass cord having a width dimension of the carcass material in a direction orthogonal to the warp of the supplied warp array to form a woven fabric. Production method. Further comprising a topping step of attaching unvulcanized rubber to both sides of the fabric using a calender roll,
In the topping step, the woven fabric is conveyed to the calender roll without applying tension to the warp yarn, and
A rubberizing step of passing the fabric through a pair of calender rolls having the unvulcanized rubber adhered to the surface;
And a rubber infiltration step for infiltrating the unvulcanized rubber between the weft yarns by narrowing the rubber-woven fabric having the unvulcanized rubber adhered to both surfaces with a pair of pressing rolls through the calender roll. 2. A method for producing a carcass material for a tire according to 1.   The method for producing a carcass material for a tire according to claim 2, wherein the conveying step has a conveying speed of 120 to 200 mm / s. In the fabric, the warp yarns are arranged at intervals of 2 to 8 mm in a pair of outer regions that are 30 mm inward from both ends in the width direction.
The method of manufacturing a carcass material for a tire according to any one of claims 1 to 3, wherein the warp yarns are arranged at intervals of 150 to 200 mm in an inner region between the outer regions.   The method for producing a tire carcass material according to any one of claims 1 to 4, wherein the width of the woven fabric is equal to a width of a carcass ply of a tire to be molded. A pair of hook frames that hold the warp and can move up and down in opposite directions;
A loom comprising a nozzle portion for weaving the weft into the warp by jetting high-pressure air is used,
The warp yarns adjacent to each other in the width direction are held in different heel frames, and are alternately guided in the up and down directions by the vertical movements of the pair of heel frames in opposite directions,
The tire carcass material according to any one of claims 1 to 5, wherein in the step of forming the woven fabric, the weft yarn is passed from the nozzle portion to an opening formed between the warp yarns that are alternately guided in the vertical direction. Manufacturing method. A fabric comprising a warp extending parallel to the longitudinal direction and a weft extending in a direction perpendicular to the warp is a carcass material for a tire wound in a roll shape along the warp,
The warp yarn has a thickness of 250 dtex or less,
The carcass material for a tire, wherein the weft is made of a carcass cord having a width dimension of the carcass material. In the woven fabric, the warp yarns are arranged at intervals of 2 to 8 mm in a pair of outer regions in a range of 30 mm inward from both ends in the width direction.
The tire carcass material according to claim 7, wherein the warp yarns are arranged at intervals of 150 to 200 mm in an inner region between the outer regions.

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