JP4449287B2 - Tire reinforcing material, method for manufacturing tire reinforcing material, and die insert for manufacturing tire reinforcing material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This invention is a tire reinforcing material used to form the tire component material of the carcass material or the like embedded reinforcing cords, relates to Daiinsa preparative production method及beauty tires reinforcing material for the manufacture of tires reinforced material, more particularly tire eliminate the overlap of the reinforcing cord definitive during lamination of the terminal portion of the reinforcing material (during splicing), tire Uni follower Mi tea tire reinforcing material can be improved, the manufacturing method及beauty tires reinforcing material for the manufacture of tires reinforced material it relates to the Daiinsa door.
[0002]
[Prior art]
Conventionally, in the manufacture of tire component material mosquito carcass materials or the like embedded reinforcement cord, the calender rolls to align uniformly pull the reinforcing cords in parallel, a plurality parallel guide grooves 1 of the reinforcing cords 4 A guide plate 2 called a thread bar formed, or a guide roll called a thread roll in which a plurality of guide grooves are formed in parallel on the outer peripheral surface is used.
[0003]
Further, the press extruder, as shown in FIGS. 5 and 6, through the reinforcing cord into a plurality of guide holes 4 in the die insert 3 has decided to pitch the reinforcement cord, the guide hole 4 is generally horizontal They are arranged at equal pitches in a state of being parallel to the direction.
[0004]
And since the arrangement | positioning of a reinforcement cord is determined in the position of the guide hole 4, when the cord diameter and cord pitch P of a reinforcement cord differ, the operation | work which replace | exchanges the die insert 3 is performed. In addition, the guide hole 4 is basically arranged at the center of the dies 3a and 3b in the vertical direction, but it is also possible to manufacture an uneven carcass by changing the interval between the dies 3a and 3b in the vertical direction. It is possible (see, for example, Patent Documents 1 and 2).
[0005]
[Patent Document 1]
JP 2002-113793 A (page 3 to page 4, FIGS. 4A and 4B).
[Patent Document 2]
JP-A-5-246207 (pages 3 to 4, FIG. 3).
[0006]
[Problems to be solved by the invention]
Meanwhile, using the molded tire reinforcement material W so as to bury the reinforcing cords 5 in a conventional press extruder and calender roll or the like, when manufacturing the carcass materials by joining the terminal unit, FIG. 7 (a ) , (B ), the tire reinforcing material W was molded so that the reinforcing cords 5 were arranged at a constant pitch P on the thick center line XX.
[0007]
For this reason, as shown in FIGS. 7A and 7B, when the joining margins of the end portions Wa of the tire reinforcing material W are abutted or overlapped and joined, the pitch of the reinforcing cord 5 at the joining portion If P is disturbed or the wall thickness changes and expands during tire vulcanization or tire molding, the wall thickness will not be uniform and the tire will not be ideally shaped, and the tire uniformity after molding will be affected. There was a problem to say.
[0008]
The present invention focuses according to conventional problems, there is no overlap of disturbance or the upper and lower reinforcing cord in the terminal portion cemented portion of the tire reinforcement materials, to improve the external appearance of the tire wall thickness becomes uniform Provided is a tire reinforcing material that can improve the dispersion of air as well as the tire uniformity, a method for manufacturing the tire reinforcing material, and a die insert for manufacturing the tire reinforcing material. It is intended to do.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the tire reinforcing material of the present invention is a sheet- like material in which a plurality of reinforcing cords are arranged in parallel at a predetermined pitch and rubber elastic materials are coated on the upper and lower surfaces thereof. In the tire reinforcing material configured as described above, a linear center line ( XX ) passing through the centers of the reinforcing cord group (10) located at the center in the width direction of the tire reinforcing material among the plurality of reinforcing cords respect, the reinforcing cord (10a, 10a) positioned in the width direction both end portions upward the center of one of the reinforcing cords (10a) of the respective center of the other reinforcing cord (10a) in a downward direction it is an essence that that was arranged by a predetermined amount Shifts.
[0010]
The shift amount is - is to set (the thickness of the tire reinforcement material diameter of the reinforcing cord) / 2 or less.
[0011]
The reinforcing cords at both ends in the width direction are arranged so as to be at the same distance from each other with respect to a linear center line ( XX ) passing through the centers of the reinforcing cord group (10) .
[0012]
By constituting the tire reinforcing material in this way, when the end portions of the tire reinforcing material are bonded together, the reinforcement cords in the bonded portions are not disturbed or overlapped vertically, and the thickness of the tire becomes uniform. Appearance shape can be improved.
[0013]
A method of manufacturing a tire reinforcing material of the present invention, a plurality of reinforcing cords in a state where aligned in parallel at a predetermined pitch, a tire reinforcement is molded into a sheet by coating a rubber-like elastic material on its upper and lower surfaces In the method for producing the material ,
With respect to the linear center line (XX) passing through the centers of the reinforcing cord group (10) located in the center portion in the width direction of the tire reinforcing material among the plurality of reinforcing cords, both end portions in the width direction Of the reinforcing cords (10a, 10a), the center of one reinforcing cord (10a) is shifted upward and the center of the other reinforcing cord (10a) is shifted by a predetermined amount. It is a summary.
[0014]
As described above, the center of one reinforcing cord located at both ends in the width direction of the tire reinforcing material is directed upward with respect to the linear center line (XX) passing through each center of the plurality of reinforcing cord groups. In addition, the tire reinforcing material having the above-described effect can be easily manufactured by forming the other reinforcing cord by shifting the center of the other reinforcing cord by a predetermined amount .
[0015]
Furthermore, Daiinsa preparative tire reinforcing material for the production of this invention, a tire reinforcement which is adapted at predetermined intervals are arranged to form so as to arrange the plurality of cord slots, and the extruder head Oite the Daiinsa bets for material production, the coding slots group positioned in the center of the die insert straight center line passing through the centers of (14a) (X-X) , positioned on both ends the center of one of the cord slots (14) of the cord slots upward, which summarized in that each of the centers of the other cord slots (14) in the downward direction is formed in a predetermined amount Shifts Suyo It is.
[0016]
By thus configuration, it is possible to obtain a tire reinforcing material to eliminate the overlap of disturbance or the upper and lower reinforcing cord to the cemented portion when bonded to both terminals easily.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0018]
Figure 1 shows the perspective view of an embodiment of a tire reinforcement material Wx for use in molding a tire component material such as carcass materials in the present invention. The tire reinforcing material Wx is formed in a sheet shape by covering the upper and lower surfaces with rubber-like elastic material 11 with an extruder in a state where a plurality of reinforcing cords 10 are arranged in parallel.
[0019]
Tire reinforcement material Wx in the implementation form of the invention, with respect to the linear center line X-X passing through the centers of the plurality of reinforcing cords 10 of the position in the width direction both end portions Wz of the tire reinforcing material Wx reinforcing cords 10a to the center O of one of the reinforcing cords 10a of 10a upward, Aru each center O of the other reinforcing cord 10a downwardly formed shifted by a predetermined amount.
[0020]
As shown in FIG. 1, the shift amount Q is such that the thickness of the tire reinforcing material Wx is T 1 , the diameter of the reinforcing cord is d 2 , and the rubber at a location corresponding to the portion of the reinforcing cord 10 in the thickness direction of the tire reinforcing material Wx. When the thickness is a, it is preferable to set ( T−d ) / 2 = a or less.
[0021]
That is, when the shift amount Q is set to a or more, the reinforcing cord 10 may come out from the rubber layer , and in fact, the reinforcing cord 10 may come into contact with the die throat, which is not preferable.
[0022]
Further , the reinforcing cords 10a, 10a located at both end portions Wz in the width direction of the tire reinforcing material Wx are mutually in relation to a linear center line XX passing through the centers of the reinforcing cord groups 10 located at the central portion. By arrange | positioning so that it may become the same distance , when joining the width direction terminal part Wz of the tire reinforcement material Wx , it can be made to balance uniformly.
[0023]
That is, when molding a tire component material such as a carcass material by joining the widthwise direction end portion Wz of the tire reinforcing material Wx thus formed, as shown in FIG. 2 (a) ~ (b) , the tire When the joining margins of the longitudinal end portions Wz of the reinforcing material Wx are overlapped in the vertical direction and pressed in the direction of the arrow from above, the reinforcing cords 10, 10a, 10a are arranged at an equal pitch as shown in FIG. and uniform wall joint to the thickness t fit to it be.
[0024]
As a result, the reinforcing cord 10, 10a, 10a eliminates overlap of disturbance or the upper and lower pitch, Ru can be improved tire appearance shape after molding thickness becomes uniform.
[0025]
As a method for producing a tire reinforcement material Wx of implementation forms are shown in FIGS. 1 and 2 (a) ~ (c), using the die insert 13 to be described later, a plurality of positioned at the center The center O of one of the reinforcement cords 10a, 10a of the reinforcement cords 10a, 10a located at the width direction both ends Wz of the tire reinforcement material Wx with respect to the linear center line XX passing through each center of the reinforcement cord 10 And the center O of the other reinforcing cord 10a is shifted downward by a predetermined amount.
[0026]
Its shift amount Q is - sets below (the thickness of the tire reinforcing material Wx (T) diameter of the reinforcing cord (d)) / 2 = ( a).
[0027]
In this way, the reinforcement cords 10a and 10a located at both end portions Wz of the tire reinforcement material Wx with respect to the linear center line XX passing through the centers of the plurality of reinforcement cords 10 located at the center portion. among the center O of one of the reinforcing cords 10a upward, the center O of the other reinforcing cord 10a by molding and shifted downward, the sheet-shaped tire reinforcing material Wx can be easily manufactured.
[0028]
Also, as the die insert 1 3 is used to produce tires reinforcement material Wx above you facilities embodiment, as shown in FIG. 3, a plurality of cord slots 14a positioned at the center of the die insert 13 The center O of the cord slot 14 formed at both ends with respect to the straight center line XX passing through each center of the center, the center O of one cord slot 14 upward , and the other cord slot the center O of 14 and forms shifted respectively downward.
[0029]
Thus, the cord slots 14 formed in the width direction both end portions of the die insert 13, relative to the straight center line X-X passing through the centers of a plurality of cord slots 14a of the central portion, of one With a simple configuration in which the center O of the cord slot 14 is shifted upward and the center O of the other cord slot 14 is shifted downward, the reinforcement cord 10 may be disturbed when the width direction end portions are bonded together. Ru possible to mold a tire reinforcement material Wx to ensure that there is no up and down the overlap.
[0030]
【The invention's effect】
Since the present invention is configured as described above, when the tire constituent material such as the carcass material is formed by laminating the width direction end portions of the tire reinforcing material, the reinforcement cord is not disturbed or overlapped vertically in the tire reinforcing material . In addition, the thickness of the tire can be made uniform to improve the appearance of the tire, and the dispersion of air can be improved at the time of molding the tire, and the uniformity of the tire can be further improved. can Ru.
[0031]
Further, Daiinsa TMG, the center of the cord slots to be formed in the width direction both end portions of the die inserts, with respect to the straight center line passing through the center of the cord slots located in the central portion, of one of the cord slots When forming tire components such as carcass materials with a simple configuration in which the center is shifted upward and the center of the other cord slot is shifted downward , the tire prevents the reinforcement cord from being disturbed or vertically overlapped. Ru can be molded reinforcement material.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a tire reinforcing material according to the present invention.
FIGS. 2A to 2C are explanatory views showing a process of joining the end portions in the width direction of the tire reinforcing material of FIG. 1;
FIG. 3 is a side view of a die insert for manufacturing a tire reinforcing material according to the present invention.
FIG. 4 is an explanatory diagram of a conventional guide plate called a thread bar.
FIG. 5 is a cross-sectional view of a conventional die insert.
6 is a side view taken along the line AA in FIG. 5 ;
FIGS. 7A and 7B are explanatory views showing a width-direction joining step of a tire reinforcing material in which a conventional reinforcing cord is embedded.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Guide groove 2 Guide plate 3 Die insert 3a, 3b Vertical die 4 Guide hole 5 Reinforcement cord W Tire reinforcement material XX Center line P Pitch Wa Width direction terminal part O Center Wx Tire reinforcement material 10 Reinforcement cord 10a Reinforcement cord 11 Rubber-like elastic material Wz Width direction end part 13 Die inserts 14 and 14a Code groove hole Q Shift amount

Claims (5)

In a tire reinforcing material formed by arranging a plurality of reinforcing cords in parallel at a predetermined pitch and covering the upper and lower surfaces with a rubber-like elastic material to form a sheet,
With respect to the linear center line ( XX ) passing through each center of the reinforcing cord group (10) located in the center portion in the width direction of the tire reinforcing material among the plurality of reinforcing cords , both end portions in the width direction position reinforcing cord (10a, 10a) upward the center of one of the reinforcing cords (10a) of the, characterized in that each center of the other reinforcing cord (10a) in the downward direction and the arrangement by a predetermined amount Shifts Tire reinforcement material. Tire reinforcement material according to claim 1 to be set to - (reinforcing diameter code thickness of the tire reinforcement material) / 2 less than the width direction both end portions of the reinforcing cord (10a, 10a) of the shift amount of each. The shift amounts of the reinforcing cords (10a, 10a) at both ends in the width direction are the same distance from each other with respect to the straight center line ( XX) passing through the centers of the reinforcing cord group (10). The tire reinforcing material according to claim 2 , which is disposed on the tire. In a state where a plurality of reinforcing cords are arranged in parallel at a predetermined pitch, a rubber reinforcing material is coated on the upper and lower surfaces of the reinforcing cord, and the tire reinforcing material is formed into a sheet shape.
With respect to the linear center line (XX) passing through the centers of the reinforcing cord group (10) located in the center portion in the width direction of the tire reinforcing material among the plurality of reinforcing cords, both end portions in the width direction Of the reinforcing cords (10a, 10a), the center of one reinforcing cord (10a) is shifted upward and the center of the other reinforcing cord (10a) is shifted by a predetermined amount. A method for manufacturing a tire reinforcing material. Oite the Daiinsa preparative tire reinforcing material for production which is adapted at a predetermined interval is formed so as to be arranged a plurality of cord slots, and are disposed in the extruder head,
One cord groove of the cord groove holes located at both ends with respect to the linear center line (XX) passing through the center of the cord groove group (14a) located at the center portion of the die insert. the center of the hole (14) in the upward direction, Daiinsa bets for a tire reinforcing material production, characterized in that each of the central downward is formed in a predetermined amount Shifts Suyo the other cord slots (14).

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