JP2003334869A - Manufacturing method for cord-containing strip-like ply - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the generation of production failure of an open cord or the like when a cord-containing strip-like ply is manufactured. <P>SOLUTION: One cord on the outermost side of both ends in a widthwise direction is set to a spiral cord, and all of cords on the inner side thereof are set to non-spiral cords to produce a treat 40. The excessive coating rubber 108 outside the widthwise direction of the treat 40 is removed from the part passing the outermost point P in the widthwise direction of the treat 40 of the lap filament 102 of a spiral cord 104. This treat 40 is cut to form treat pieces 40A, and the ends on the side of the spiral cord 104 of the treat pieces 40A are abutted to produce a butt-joined strip-like ply. Since the treat pieces 40A are set to a butt-joined state by mutually abutting the ends having a sufficient amount of the coating rubber 108 remaining thereon, the joining force of the joint is ensured and the detaching trouble of the joint is not generated at the time of molding of the tire and readjustment or the like becomes unnecessary. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a method for manufacturing a cord-containing band-shaped ply, and more particularly to a cord-shaped band-shaped ply capable of suppressing the occurrence of manufacturing defects such as open cords. And a method for producing the same. [0002] For example, a treat is used for a carcass ply or a belt ply of a pneumatic radial tire. In this treat, a plurality of aligned cords are covered with a coating rubber. A cord used for a carcass ply or a belt ply generally comprises a plurality of filaments. [0004] As a kind of code, for example, FIG.
As shown in (A), a so-called spiral cord 104 having a wrap filament 102 in which a plurality of filaments 100 have a layer-twisted structure and the outer periphery thereof is spirally wound.
FIG. 5 without the wrap filament 102
There is a so-called non-spiral code 106 as shown in FIG. In general, the following properties of the spiral code 104 and the non-spiral code 106 are known. [0006] The spiral cord 104 has a small deformation in the cord section at the time of bending because the outer periphery is wound by the wrap filament 102, but on the other hand, the spiral cord 104 has a heavy weight and a high cost because it has the wrap filament 102. Has become. On the other hand, the non-spiral cord 106 has a higher fretting resistance than the spiral cord 104,
It is excellent in corrosion resistance and fatigue resistance, and is lightweight because it does not have the wrap filament 102. When a carcass ply or a belt ply is manufactured by rubber-coating the non-spiral cord 106, the non-spiral cords 106 are arranged in all rows to produce a large roll, and then the treat is adjusted to the required angle and width. The cut and trimmed treat pieces are connected to each other with a butt joint to form a small roll, which is cut in accordance with the circumference of the tire and used for manufacturing a raw tire. [0009] However, in the conventional manufacturing method, the amount of adhesion of the ear rubber during the anti-trimming of the large winding is not stable, that is, as shown in FIG. As a result, there is a problem that the amount of adhesion of the coating rubber 108 is insufficient and the non-spiral cord 106 is exposed. [0010] Therefore, as shown in FIG. 5 (B), a shortage of the coating rubber 108 causes a decrease in the joining force at the butt joint portion, thereby causing a manufacturing defect (so-called open cord) in which the joint portion comes off during tire molding. In addition, there is a problem that a reworking operation occurs in the cutting. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a cord-shaped belt-like ply, which can suppress the occurrence and repair of a manufacturing defect in consideration of the above fact. [0012] In order to achieve the above object, a method for manufacturing a cord-containing band-like ply according to the first aspect of the present invention is to pull a plurality of cords parallel to each other and coat them with a rubber. A first step of obtaining a treat;
A second step of removing excess coating rubber at both ends in the width direction of the treat, and cutting the treat from which the excess coating rubber has been removed in a direction intersecting the longitudinal direction of the cord to form a plurality of treats. Third to get a piece
And a butt joint between ends of the treat piece along the cord to obtain a long belt-like ply.
Wherein the plurality of cords in the widthwise middle portion are non-spiral cords, and at least the outermost cord in the widthwise direction is spirally wound around the outer periphery of a basic structure composed of a plurality of filaments. A spiral cord having a wrapped filament, wherein in the second step, excess coating rubber is removed along an outer end of the wrapped filament in a treat width direction. Next, the operation of the method for producing a cord-containing belt-like ply according to the first aspect will be described. First, in a first step, a plurality of cords are aligned parallel to each other and rubber-coated to obtain a treat. In this treatment, a plurality of codes in the middle part in the width direction are non-spiral codes, and at least the outermost code in the width direction is a spiral code. In the next second step, excess coating rubber protruding outside both ends in the width direction of the treat is removed. At this time, the excess coating rubber is removed along the outer end in the treat width direction of the wrap filament. Therefore, the filaments constituting the basic structure are not exposed at both ends in the width direction of the treat after removing the excess coating rubber, and a sufficient amount of the coating rubber (ears) necessary for the butt joint is provided outside the basic structure. Rubber) is left. In the next third step, the treat from which the excess coating rubber has been removed is cut in a direction intersecting the longitudinal direction of the cord to obtain a plurality of treat pieces. In the next fourth step, the ends of the treat piece obtained in the third step on the spiral cord side are butt-joined (associative joining in which the ends are not overlapped with each other). A strip ply of a length is obtained. [0018] Here, the treated piece is butt-joined by abutting the remaining portions of the coating rubber (ear rubber) in a sufficient amount necessary for the joint, so that reliable joining can be performed. It should be noted that the present invention is effective if the outermost one in the width direction of the treat is a spiral code. Two or more spiral cords may be provided on the outermost side in the width direction of the treat, but increasing the number of spiral cords increases the cost. Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic structural view of a ply manufacturing apparatus 10 for manufacturing a cord-shaped belt-like ply of the present invention. As shown in FIG. 1, a ply manufacturing apparatus 10
Is a creel stand 16 on which a plurality of reels 14 around which cords (non-spiral cords and spiral cords) are wound, a aligning device 18 for aligning a plurality of cords at an equal pitch, and a plurality of aligned cords. A calender 20 for coating the front and back surfaces of the cord with unvulcanized rubber to form a treat 40; a cooling unit 22 for cooling the treat 40; a festoon 24 for adjusting the tension by providing a predetermined slack in the treat 40; 40
A trimming device 28 for removing excess coating rubber at both end portions of the device and a winding device 30 for winding the trimmed treat 40 are provided. The calender device 20 includes a pair of upper rollers 32 for coating unvulcanized rubber on the upper surfaces of a plurality of aligned cords, and a pair of lower rollers 34 for coating unvulcanized rubber on the lower surfaces of the aligned plurality of cords. By supplying a plurality of aligned cords between the upper roller pair 32 and the lower roller pair 34, uncured uncured top and bottom surfaces (front and back surfaces) of the aligned plurality of cords are provided. Rubber can be coated. The trimming device 28 includes a cutter 36 for removing excess coating rubber 108 at both ends in the width direction of the treat 40. The winding device 30 has a drum 38 for winding the treat 40. (Operation) Next, the operation of the ply manufacturing device 10 will be described. The plurality of cords drawn from the creel stand 16 are aligned at equal pitches by the alignment device 18. Here, at the time of alignment, the outermost one on both sides in the width direction is a spiral code 104, and the entire inside is a non-spiral code 106. The plurality of cords thus arranged are thereafter coated with the coating rubber 108 on the front and back surfaces by the calender device 20 to form the treat 40. The treat 40 is cooled by the cooling unit 22, reaches the trimming device 28 via the festoon 24, and the cutter 36 removes excess coating rubber at both ends. In the trimming device 28, the cutter 36 is applied at right angles to the treating surface, and the spiral cord 1
No contact with the filament 100 forming the basic structure of the spiral cord 104 as shown in FIG.
Outermost point P of the wrap filament 102 in the treat width direction
The excess coating rubber 108 substantially outside in the treat width direction is removed from the portion passing through the spiral cord 10.
A sufficient amount of coating rubber 108 (ear rubber) required for a later butt joint is left outside the filament 100 having the basic structure of No. 4 in the treat width direction. Thereafter, the treat 40 is moved to the winding device 30.
And a liner (not shown). Next, a process of manufacturing a carcass ply of a tire using the treat 40 will be described. First, as shown in FIG. 3A, the treat 40 drawn out of the drum 38 is cut at a fixed length L according to the tire size in a direction substantially perpendicular to the longitudinal direction of the treat 40. 3A, the ends of the spiral cord 104 are attached to each other as shown in FIGS. 3 (B), 2 (B) and 2 (C), and the butt joint is wound. Obtain Komaki anti. The treated piece 40A is butt-joined by abutting the ends where a sufficient amount of the coated rubber 108 is left, so that the coated rubber 108 of one treated piece 40A and the coated rubber of the other treated piece 40A are coated. 108 (see FIG. 2 (C)), the joint strength of the butt joint is ensured, the joint does not come off at the time of tire molding (so-called open cord), and there is no failure due to reworking by cutting. Uptime is also lost. Further, since most of the treat 40 is constituted by the non-spiral cord 106, the cost advantage of the non-spiral cord 106 can be utilized and the occurrence of manufacturing defects can be suppressed. In the above embodiment, the outermost one in the width direction of the treat 40 is the spiral cord 104, but a plurality of the outermost cords may be the spiral cord 104. When the number of the spiral cords 104 increases, the weight and the cost increase. (Test Example 1) Next, in order to confirm the effects of the method for producing a corded belt ply of the present invention, a ply produced by the method for producing a corded belt ply of the present invention and a ply produced by a conventional production method. A ply was prototyped and the joint strength was compared. Evaluation Method of Bonding Force (1) The chuck interval of the tensile tester is set to 60 mm. (2) Set the sample so that the butt joint is at the center between the chucks. (3) The sample was pulled at a speed of 500 mm / min, and the breaking strength and the breaking position (whether or not at the butt joint) were compared. The results of the evaluation of the joining force are as shown in FIG. 4, and it can be seen that in the conventional method, a decrease in the breaking strength of the joint part occurs sporadically. On the other hand, in the present invention, it can be seen that the decrease in the breaking strength of the joint is suppressed. (Test Example 2) In addition, in order to confirm the effect of the method of manufacturing a corded belt ply of the present invention, a tire using a ply manufactured by the method of manufacturing a corded belt ply of the present invention and a conventional manufacturing method were used. A tire using the manufactured ply was prototyped, the tire was disassembled, and the occurrence frequency of open cords was examined. In a tire using a ply manufactured by the conventional manufacturing method, open cords are generated at a frequency of 1 to 3%. In a tire using a ply manufactured by the manufacturing method of the present invention, There was no open code. As described above, according to the present invention, the cost advantage of the non-spiral cord is utilized, and the disadvantage of non-spiral cord-specific joint strength reduction is eliminated, and the present invention is inexpensive and stable. This has the effect of maintaining the production quality.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram of a ply manufacturing device. FIG. 2 (A) is a cross-sectional view near the end of a treat from which excess coating rubber has been removed by the manufacturing method of the present invention, and FIG. 2 (B) is a cross-sectional view near the end of the treat immediately before a butt joint. (C) is a sectional view near the butt joint portion. FIG. 3 (A) is an explanatory view of a step of cutting a treat to produce a treated piece, and FIG. 3 (B) is an explanatory view of a step of producing a small roll by butt-joining the treated pieces. FIG. 4 is a graph showing test results of a test example. FIG. 5A is a cross-sectional view near an end of a conventional treat, and FIG. 5B is a cross-sectional view near a butt joint portion of the conventional treat. [Description of Signs] 40 Treat 40A Treat piece 102 Wrap filament 104 Spiral cord 106 Non-spiral cord 108 Coating rubber

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Muneyoshi Maeda             3-1-1 Ogawa Higashicho, Kodaira City, Tokyo Stock Association             Bridgestone Technology Center F term (reference) 4F212 AA45 AD03 AD16 AH20 VA09                       VA11 VL01 VL07

Claims (1)

Claims: 1. A first method for obtaining a treat by pulling a plurality of cords parallel to each other and coating them with a rubber.
And a second step of removing excess coating rubber at both ends in the width direction of the treat; and cutting the treat from which the excess coating rubber has been removed in a direction crossing the longitudinal direction of the cord. A third step of obtaining a plurality of treated pieces, and a fourth step of butt-joining ends of the treated pieces along the cord to obtain a long strip-shaped ply, wherein the treat has a width of A plurality of cords in the direction intermediate portion are non-spiral cords, and at least the outermost cord in the width direction is a spiral cord having a wrap filament spirally wound around the outer periphery of a basic structure composed of a plurality of filaments, In the second step, excess coating rubber is removed along the outer edge in the treat width direction of the wrap filament. Manufacturing method of over-de-filled strip plies.