JP5638870B2 - Method for manufacturing top sheet for tire member - Google Patents

Description

  The present invention relates to a method for manufacturing a top member for a tire member. More specifically, the present invention relates to a method for manufacturing a top member for a tire member that obtains a top member for a tire member by topping rubber on a textile member made of weft and warp.

  In the tire manufacturing process, various types of tire members such as tapes and belts are used. Conventionally, these tire members are cut to a predetermined size after passing through a topping process in which uncured rubber (topping rubber) is coated (topping) on both sides of a textile member made of weft and warp. (For example, patent document 1).

  This topping process will be specifically described with reference to FIGS. FIG. 8 is a perspective view schematically showing an outline of a topping process in a conventional tire manufacturing process, and FIG. 9 is a cross-sectional view of the manufactured top.

  8 and 9, 51 is a textile cord (warp), and 52 is a weft. A textile member 53 is formed by weaving the textile cord 51 and the weft 52. Here, the weft 52 is driven in order to maintain the uniformity of the interval (end distribution) of the textile cord 51 before the topping process. Reference numeral 54 denotes a calendar device having two sets of upper and lower calendar rolls, and reference numeral 55 denotes a topping rubber supplied from the upper and lower calendar rolls.

  When the textile member 53 passes through the calendar device 54, the top member 57 having the topping rubber layer 56 formed thereon is manufactured by covering the both sides of the textile member 53 with the topping rubber 55.

  As described above, in the conventional method, the top fabric 57 is manufactured with the weft yarn 52 remaining (connected). However, when a tire member (for example, a body ply) obtained by cutting the top reaction 57 into a predetermined size is attached to a raw tire and vulcanized, the weft is cut on both sides of the tire member. Under the influence of the uncut woof 52, in the product tire after vulcanization, the intervals (ends distribution) of the textile cords 51 may become uneven. Product tires with non-uniform textile cord spacing (end distribution) deteriorate the uniformity and are therefore defective.

JP 2002-321267 A

  In view of the above problems, the present invention provides a tire in which the distance (end distribution) between textile cords does not become uneven when a tire member obtained by cutting the top surface is attached to a raw tire and vulcanized. It is an object of the present invention to provide a method for manufacturing a top member for a tire member that can provide the member.

The manufacturing method of the top fabric for a tire member according to the present invention is as follows.
A tire member top manufactured by coating a topping rubber on a textile member in which a textile cord formed in parallel and at a predetermined interval and a weft thread oriented in a substantially right angle direction are woven with the textile cord. An anti-manufacturing method,
With an annular groove is formed at a predetermined interval in a roll axis direction, the cutting blade between the annular groove is found protrudes, the distance of the cutting edge of the cutting blade is larger than the thickness of the textile cord, of the cutting blade The cross-sectional shape of the cutting blade is formed in a substantially triangular shape so that the interval becomes narrower toward the root, and the grooved roll formed continuously without a step between the root of the cutting blade and the annular groove , By arranging the textile member in a direction substantially perpendicular to the textile cord and passing the textile member through the grooved roll, the weft thread is cut by the cutting blade, and the textile cord is fitted and aligned in the annular groove,
Thereafter, the textile cord from which the weft has been cut is carried into a calendar device and covered with the topping rubber, thereby obtaining a tire member top fabric. .

And the manufacturing method of the top reaction for said tire members is as follows.
A pressing roll having annular protrusions formed at predetermined intervals in the roll axis direction is juxtaposed with the grooved roll so that the annular protrusion faces the annular groove of the grooved roll,
The lifting of the textile cord from the annular groove of the grooved roll is suppressed by the annular protrusion.

And the manufacturing method of the top reaction for said tire members is as follows.
The groove width a of the annular groove, the groove interval b, the height c of the cutting blade, and the angle θ of the blade edge satisfy the relationships shown in the following (1) to (3). To do.
(1) 0.5 ≦ b / a ≦ 1.0
(2) 1.5 ≦ c / a ≦ 3.0
(3) 15 ° ≦ θ ≦ 35 °

And the manufacturing method of the top reaction for said tire members is as follows.
The groove width a of the annular groove, the height c of the cutting blade, the height d of the annular protrusion, and the top surface width e satisfy the relationship shown in the following (1) and (2). It is characterized by being.
(1) a = e
(2) d> c

  According to the present invention, when the textile member is passed through the grooved roll, the weft is cut and the textile cord is aligned, so that the top top is obtained by covering the topping rubber and then manufacturing the top. Even if a tire member obtained by cutting the opposite part into a predetermined size is attached to a raw tire and vulcanized, the spacing (end distribution) of the textile cord does not become uneven and the uniformity is stable. Product tires can be obtained.

It is a perspective view which shows typically the outline | summary of manufacture of the top reaction for tire members which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the state by which the textile cord (warp yarn) was engage | inserted by the annular groove of the grooved roll used for manufacture of the top sheet | seat for tire members which concerns on the 1st Embodiment of this invention. FIG. 3 is a partially enlarged cross-sectional view of the grooved roll shown in FIG. 2. It is sectional drawing of the top anti-fabric produced by the manufacturing method of the top anti-tire for tire members which concerns on the 1st Embodiment of this invention. It is a perspective view which shows typically the outline | summary of manufacture of the top reaction for tire members which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the state by which the textile cord was engage | inserted by the annular groove of the roll with a groove | channel used for manufacture of the top reaction for tire members which concerns on the 2nd Embodiment of this invention. FIG. 7 is a partially enlarged cross-sectional view of the grooved roll and the pressing roll shown in FIG. 6. It is a perspective view which shows typically the outline | summary of the topping process in the manufacturing method of the conventional top fabric for tire members. It is sectional drawing of the top reaction for tire members manufactured by the conventional manufacturing method.

  Hereinafter, the present invention will be described based on 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.

(First embodiment)
1. Textile member First, the textile member used for the top anti-fabrication method according to the first embodiment will be described. FIG. 1 is a perspective view schematically showing an outline of manufacturing the top member for a tire member according to the first embodiment. In FIG. 1, reference numeral 5 denotes a textile member (claw weave) conveyed by a conveyance roll (not shown). The textile member 5 is configured by weaving the textile cord 3 and the weft yarn 4.

  For the textile member 5, for example, the number (ends) of the textile cords 3 per 50 mm width is 25 to 75 and the total width is 500 mm to 2500 mm.

  The material of the textile cord 3 is a synthetic fiber such as nylon (polyamide fiber), Kevlar (aramid fiber manufactured by DuPont), PEN (polyethylene naphthalate), PET (polyester fiber), or a pulp fiber such as rayon. For example, those conventionally used as textile codes are preferably used. Moreover, as a material of the weft 4, polyethylene or polypropylene is preferably used.

2. Cutting the weft of the textile member and fixing the interval of the textile cord Next, the cutting of the weft of the textile member and fixing the interval of the textile cord will be described. As shown in FIG. 1, the textile member 5 is conveyed in the direction of the arrow in the figure. Then, immediately before the topping rubber 6 is carried into the calendar device 1 for topping, the weft cutting device 2 provided slightly upstream of the calendar device 1 is passed.

  The weft cutting device 2 includes a grooved roll 21 arranged in a direction substantially perpendicular to the textile cord 3 of the textile member 5. On the outer peripheral surface of the grooved roll 21, a large number of annular grooves 22 are formed for fitting the textile cords 3 at predetermined intervals in the roll axis direction.

  Further, annular cutting blades 23 are provided between the many annular grooves 22, and the interval between the cutting blades 23 becomes narrower toward the root of the cutting blade 23. The cross-sectional shape is formed in a substantially triangular shape, and the root of the cutting blade 23 and the annular groove 22 are formed continuously without a step. Further, the interval between the cutting edges of the cutting blade 23 is larger than the thickness (diameter) of the textile cord 3, and is set in consideration of the end.

  In the textile member 5 passed through the weft cutting device 2, the weft 4 is cut by the cutting blade 23 and the textile cord 3 is fitted in the annular groove 22 at the same time. At this time, the plurality of textile cords 3 are fixed at a predetermined interval on the substantially same plane without meandering up and down. FIG. 2 is a cross-sectional view showing a state in which a textile cord (warp yarn) is fitted in an annular groove of a grooved roll used for manufacturing the top member for a tire member according to the first embodiment.

3 is a partially enlarged cross-sectional view of the grooved roll 21. In FIG. 3, a is the groove width of the annular groove 22, b is the groove interval of the annular groove 22, c is the height of the cutting blade 23, and θ is the cutting. This is the angle of the cutting edge of the blade 23. The value of a + b is set so as to conform to the end of the target textile member. These a, b, c, and θ preferably satisfy the following conditions.
(1) 0.5 ≦ b / a ≦ 1.0
(2) 1.5 ≦ c / a ≦ 3.0
(3) 15 ° ≦ θ ≦ 35 °

  That is, by setting the above a, b, c, and θ so as to satisfy the conditions (1) to (3), it is applied to various commonly used textile members, for example, for each product number. Even when the thicknesses of the textile cords are different, the weft yarn is securely cut without exchanging the grooved roll 21 and the textile cord 3 (see FIG. 2) is fitted into the annular groove 22 to more securely It is possible to align the book textile cords at a predetermined interval while suppressing the meandering of the positions of each other in the vertical direction.

  The grooved roll 21 is supported by a support body (not shown), and is rotated by an electric motor through a transmission means (not shown).

3. Next, the topping will be described with reference to FIG. As described above, the textile member 5 is carried into the calendar device 1 in a state where the weft 4 is cut and the interval between the textile cords 3 is fixed at a predetermined interval. The calendar device 1 includes upper molding rolls 11 and 12 arranged in a direction substantially perpendicular to the textile cord 3, and a lower molding roll 13 arranged in parallel to the upper molding rolls 11 and 12 on the opposite side across the textile cord 3. 14.

  The topping rubber 6 supplied between the upper molding rolls 11 and 12 arranged at a predetermined interval passes between the upper molding rolls 11 and 12 and is placed on the outer peripheral surface of the upper molding roll 11 in a sheet state. The topping rubber 6 that is moved and supplied between the lower forming rolls 13 and 14 disposed at a predetermined interval passes between the lower forming rolls 13 and 14 and is in the form of a sheet. To move on. Then, when the textile member 5 passes between the upper molding roll 11 and the lower molding roll 13, the top surface 8 in which the top and bottom surfaces of the textile member 5 are covered with the topping rubber 6 and the topping rubber layer 7 is formed is manufactured. Is done.

  FIG. 4 is a cross-sectional view of the top substrate manufactured by the method for manufacturing a tire member top substrate according to the first embodiment. According to the method for manufacturing a top member for a tire member according to the first embodiment, since the weft 4 is cut when the top member 8 is manufactured, the textile cord 3 is formed into the annular shape of the grooved roll 21 as described above. It can be fitted into the groove 22.

  Further, since the weft 4 is cut immediately before the textile member 5 is carried into the calendar device 1, the textile cord 3 is fitted into the annular groove 22 and fixed and carried into the calendar device 1, so that the topping rubber 6 is The textile code 3 is kept at a predetermined interval until it is topped. As a result of the above, as shown in FIG. 4, the plurality of textile cords 3 are arranged in substantially the same plane without meandering in the vertical direction, and the top fabric 8 having a uniform end is manufactured. Can do.

  Further, the tire member (body ply) obtained by cutting the top reaction 8 from which the weft 4 according to the first embodiment is cut to a predetermined width is vulcanized under the influence of the weft as in the conventional body ply. The spacing (ends distribution) of the textile code 3 does not become uneven later.

  Then, as described above, a pneumatic tire is manufactured using the top fabric 8 in which the textile cords 3 are arranged on substantially the same plane, and using a body ply having a uniform end distribution, thereby producing a pneumatic tire with excellent uniformity. Can do.

  The textile member 5 is driven at a pitch L1 of 15 to 20 mm in the prior art (see FIG. 8), because it is sufficient that the weft is driven at a pitch that does not cause collapse in the state of the roll opposite to the dipping before topping. What is necessary is just to drive in the weft yarn which has been put at a pitch L2 (see FIG. 1) of 50 to 150 mm, and the number of weft threads to be driven can be reduced.

(Second embodiment)
FIG. 5 is a perspective view schematically showing an outline of manufacturing the top member for a tire member according to the second embodiment of the present invention. FIG. 6 is a cross-sectional view showing a state in which the textile cord is fitted in the annular groove of the grooved roll used for manufacturing the top member for the tire member according to the present embodiment.

  As shown in FIG. 5, in the method for manufacturing the top member for a tire member according to the present embodiment, the weft 4 of the textile member 5 is cut and the distance between the textile cords 3 is predetermined as in the first embodiment. The textile cord 3 is carried into the calendar device 1 in a state of being fixed at an interval of, and the interval of the textile cord 3 is kept at a predetermined interval until the topping rubber is topped. Thereby, the textile cords 3 are arranged in substantially the same plane without mutual meandering in the vertical direction, and it is possible to manufacture a top fabric having a uniform end.

  The weft cutting device 2A used in the present embodiment includes a pressing roll 30 provided in parallel with the grooved roll 21 in addition to the grooved roll 21 described in the first embodiment. Different from the first embodiment. In addition, about the structure same as 1st Embodiment, the same code | symbol is attached | subjected to drawing and description is abbreviate | omitted.

  As shown in FIG. 6, the pressing roll 30 has annular protrusions 31 that mesh with the annular groove 22 of the grooved roll 21 at predetermined intervals in the roll axis direction, and the interval between the annular protrusions 31 is that of the annular protrusion 31. The cross-sectional shape of the annular projecting portion 31 is formed in a substantially trapezoidal shape so as to become narrower toward the root.

  Then, in the textile member 5 passed through the weft cutting device 2, the weft 4 is cut by the cutting blade 23 and the textile cord 3 is fitted in the annular groove 22 at the same time. Further, the presence of the annular projecting portion 31 of the pressing roll 30 can suppress the textile cord 3 from floating from the annular groove 22. As a result, the plurality of textile cords 3 are fixed at predetermined intervals on substantially the same plane without meandering up and down each other. Then, the top fabric 8 which is topped by the calendar device 1 and has a uniform end can be manufactured.

  FIG. 7 is a partially enlarged sectional view of the grooved roll 21 and the pressing roll 30 shown in FIG. In FIG. 7, d is the height of the annular protrusion 31, and e is the top surface width of the annular protrusion 31. As described above, a is the groove width of the annular groove 22, b is the groove interval of the annular groove 22, c is the height of the cutting blade 23, and θ is the angle of the cutting edge of the cutting blade 23.

These a, c, d, and e preferably satisfy the following conditions.
(1) a = e
(2) d> c

  That is, by setting the above a, c, d, and e so as to satisfy the conditions (1) and (2), it is possible to prevent the cutting edge of the cutting blade 23 from hitting the pressing roll 30 and being damaged.

  The pressing roll 30 is supported by a support body (not shown), and is driven to rotate by an electric motor via a transmission means (not shown).

  In this embodiment, the weft yarn of the textile member 5 is cut at the same time using the weft yarn cutting device provided with various grooved rolls 21 having different groove widths, groove intervals, cutting blade heights and cutting blade edge angles. An example in which a pneumatic tire was manufactured using a top fabric 8 manufactured by carrying the textile member 5 into the calender device 1 and fixing the topping rubber to the calender device 1 after being fitted and fixed to the grooved roll 21 and evaluating the uniformity. It is. As a comparative example, a pneumatic tire was manufactured using a top fabric manufactured without cutting the weft before topping, and the uniformity was evaluated.

(1) Manufacture of pneumatic tires a. Used grooved roll In this example, b / a, c / a, and θ are shown in Table 1 for the groove width a, groove interval b, cutting blade height c, and blade edge angle θ shown in FIG. 8 types of grooved rolls were prepared, and a pneumatic tire was manufactured using the top fabric manufactured using each of the grooved rolls. Note that a + b = 0.83 mm. Moreover, the roll diameter of the used roll with a groove | channel is 300 mm.

B. Textile members used All examples used the same textile members. In the comparative example, a textile member having the same configuration as that of the example was used except that the weft driving pitch was different. The specific structure of the used textile member is shown below.
Textile cord thickness: 1100 dtex / 2 HM
Total number of textile cords: 1770 Ends: 61 Weft threading pitch: 100 mm (Example)
15mm (comparative example)

(2) Measurement of uniformity a. Measurement method Low-speed RFV of a tire manufactured using a uniformity measuring machine (a variation in the radial force of the tire when the tire is rotated at a sufficiently low speed at which centrifugal force does not act, for example, a speed of 10 km / h or less, that is, Radial force variation) and high-speed TFV (speed at which centrifugal force acts, for example, fluctuation of force in the longitudinal direction of the tire when the tire is rotated at a speed of about 100 to 120 km / h, that is, tangential force variation) did. Note that 50 tires were measured for each of Examples 1 to 8 and Comparative Example, and the average value X and standard deviation σ of the low speed RFV and the high speed TFV were obtained.

B. Measurement Results Table 1 shows the measurement results as indices when the average value X and the standard deviation σ of the comparative example are taken as 100.

  From Table 1, it can be seen that in all of Examples 1 to 8, both the low speed RFV X and σ and the high speed TFV X and σ are smaller than those of the comparative example. Also, among the examples, the groove width a of the annular groove 22 of the grooved roll 21, the groove interval b of the annular groove 22, the height c of the cutting blade 23, and the angle θ of the cutting edge of the cutting blade 23 have been described above. It can be seen that Examples 1 to 6 satisfying the relationship of (3) are smaller in X and σ of the low-speed RFV and the high-speed TFV than in Examples 7 and 8.

  In this manner, the weft of the textile member is cut immediately before topping in the manufacture of the top fabric for the tire member, and the top fabric manufactured by fixing the spacing of the textile cord at a predetermined interval by the grooved roll It was confirmed that the tire uniformity can be improved by manufacturing a pneumatic tire using a tire member cut to a width of 1 mm. In particular, it was confirmed that by using a grooved roll satisfying the above relationships (1) to (3), it is possible to manufacture a pneumatic tire with better uniformity.

  Moreover, after fixing the textile cord 3 in the grooved roll 21 using the weft cutting device 2A provided with the grooved roll 21 and the pressing roll 30, the top member 8 manufactured by topping the textile member 5 is used to enter the air. Tires were manufactured and evaluated for uniformity. Also in this case, it was confirmed that a pneumatic tire excellent in uniformity could be manufactured. In addition, the roll diameter of the used roll 21 with a groove | channel is 300 mm, and the roll diameter of the pressing roll 30 is 200 mm.

1, 54 Calendar device 11, 12 Upper forming roll 13, 14 Lower forming roll 2, 2A Weft cutting device 21 Grooved roll 22 Annular groove 23 Cutting blade 30 Pressing roll 31 Annular protrusion a Groove width b Groove interval c Cutting blade Height d Height of the annular protrusion e Top width of the annular protrusion θ Edge angle 3, 51 Textile cord 4, 52 Weft 5, 53 Textile member 6, 55 Topping rubber 7, 56 Topping rubber layer 8, 57 Top Anti-L1, L2 pitch

Claims (4)

A tire member top manufactured by coating a topping rubber on a textile member in which a textile cord formed in parallel and at a predetermined interval and a weft thread oriented in a substantially right angle direction are woven with the textile cord. An anti-manufacturing method,
With an annular groove is formed at a predetermined interval in a roll axis direction, the cutting blade between the annular groove is found protrudes, the distance of the cutting edge of the cutting blade is larger than the thickness of the textile cord, of the cutting blade The cross-sectional shape of the cutting blade is formed in a substantially triangular shape so that the interval becomes narrower toward the root, and the grooved roll formed continuously without a step between the root of the cutting blade and the annular groove , By arranging the textile member in a direction substantially perpendicular to the textile cord and passing the textile member through the grooved roll, the weft thread is cut by the cutting blade, and the textile cord is fitted and aligned in the annular groove,
Thereafter, the textile cord from which the weft has been cut is carried into a calendar device and covered with the topping rubber, thereby obtaining a tire member top fabric. A pressing roll having annular protrusions formed at predetermined intervals in the roll axis direction is juxtaposed with the grooved roll so that the annular protrusion faces the annular groove of the grooved roll,
The method for manufacturing a top member for a tire member according to claim 1, wherein lifting of the textile cord from the annular groove of the grooved roll is suppressed by the annular protrusion. The groove width a of the annular groove, the groove interval b, the height c of the cutting blade, and the angle θ of the blade edge satisfy the relationships shown in the following (1) to (3). The manufacturing method of the top reaction for tire members of Claim 1 or Claim 2 to do.
(1) 0.5 ≦ b / a ≦ 1.0
(2) 1.5 ≦ c / a ≦ 3.0
(3) 15 ° ≦ θ ≦ 35 ° The groove width a of the annular groove, the height c of the cutting blade, the height d of the annular protrusion, and the top surface width e satisfy the relationship shown in the following (1) and (2). The manufacturing method of the top reaction for tire members of Claim 3 characterized by the above-mentioned.
(1) a = e
(2) d> c

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