JP2011000767A - Device and method of manufacturing rubber sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a rubber sheet with a non-twist bundle cord having uniform intervals.SOLUTION: In the device of manufacturing the rubber sheet S with cords by topping rubbers G1, G2 on the cords C supplied from a cord supply device, the cords supplied are arranged horizontally to form the non-twist bundle cord by a plurality of cords for each bundle. The device includes a guide roller 20 having a guide groove 20A which regulates the position and guides the cord in such a manner that the interval between the formed bundle cords is constant, and rolling rollers 30B, 31B for topping the rubber G1, G2 on the bundle cord supplied from a guide member.

Description

  The present invention relates to a manufacturing apparatus and a manufacturing method for manufacturing a rubber sheet reinforced with an untwisted metal wire or an inorganic synthetic fiber cord.

In recent years, for example, in order to improve the fuel efficiency of automobiles, there is an increasing demand for weight reduction of tires. Steel cords for belt reinforcement have attracted attention as a means of weight reduction. For example, pneumatic radial tires using a reinforcement belt with a non-twisted metal wire are known for weight reduction of tires (patents) Reference 1).
In this pneumatic radial tire, for at least one belt ply of the belt layer, at least most of the metal wires in the ply are circular in cross section, and a plurality of metal wires having substantially the same wire diameter are arranged in parallel without being twisted together. Are used, and the metal wire bundles are arranged in a plane parallel to each other with a space between the bundles in the width direction to form a belt layer. Therefore, since the belt layer can be thinned by reducing the amount of covering rubber, the weight of the tire can be reduced. However, when using untwisted cords in this way, it is necessary that the untwisted cords be bundled in bundles so as not to impair the performance of the tire.
However, Patent Document 1 does not describe a method for forming a rubber sheet by bundling untwisted metal wires and topping rubber.

  In addition, as an apparatus for manufacturing a rubber tape containing a reinforcing cord, for example, as shown in FIG. It is known that after being introduced into the head 102, it is drawn out from the die hole 101 in a state of being arranged as a rubber-coated cord 105, and is formed into a tape shape by passing between the rolling rollers 103 to obtain a rubber sheet 106. (See Patent Document 2).

In the manufacturing apparatus of the rubber tape with the reinforcing cord, the cord interval at the end portion in the width direction of the rubber sheet 106 may be wider than the central portion and the interval may vary. Therefore, the die hole pitch at both ends of the die hole group of the rubber-coated head is formed so as to be smaller than the die hole pitch at the center part of the die hole group, thereby obtaining a rubber sheet having a uniform cord interval. .
However, since this method can be applied only when a rubber sheet is formed using a rubber-coated head, not only the application range is limited, but also a simple or general method because pitch processing of the die holes is required. I can't say that.

  Further, Patent Document 3 discloses a guide in which a tire cord is guided in the vicinity of one of a pair of calendar devices in order to suppress cord disturbance when an array of organic fiber tire cords without weft is rubber-topped. There is described a tire cord topping device that is provided with a grooved roller having a groove recessed in the outer peripheral surface, and presses the tire cord together with the grooved roller against a rubber sheet on a calendar device. In this topping device, the groove depth of the guide groove is 1.0 to 1.2 times the diameter of the tire cord, and the distance between the grooved roller and the calendar device is 0.2 to 1.0 mm. Has been.

  However, in this topping device, the gaps between the cords are prevented from being disturbed by using a grooved roller. However, it is possible to guide the bundled cords bundled in a bundle and prevent the gaps between the bundled cords from being disturbed. Is not considered at all.

Japanese Patent Laid-Open No. 2002-2221 Japanese Patent Laid-Open No. 2008-30211 JP 2004-330450 A

  The present invention has been made in order to solve the above-described conventional problems, and an object of the present invention is to form a bundled cord composed of untwisted cords in which a plurality of cords are arranged in parallel with each other, and each bundle. It is to produce a rubber sheet with a non-twisted cord in which the interval between the cords is made uniform and the interval between the bundled cords is not disturbed.

(1) The present invention is an apparatus for manufacturing a rubber sheet with a cord by topping rubber supplied to a cord supplied from a cord supply device, wherein the supplied cords are horizontally arranged and bundled for a plurality of cords. A guide member having guide means for forming a twisted bundle cord and guiding the position of the bundled cord so that the distance between the bundled cords is constant, and a rubber for the bundle cord fed from the guide member An apparatus for producing a corded rubber sheet.
(2) In the rubber sheet manufacturing apparatus according to (1), the guide member is a guide roller, and the guide means is provided continuously on a circumference of the guide roller and is deeper than a diameter of the cord. The rubber sheet manufacturing apparatus is characterized in that the winding angle of the bundled cord around the guide roller is within 90 degrees.
(3) In the rubber sheet manufacturing apparatus according to the above (1) or (2), the present invention is characterized in that the guide member, the bundled cord forming means, and the rolling means are each arranged substantially linearly. This is a rubber sheet manufacturing apparatus.
(4) In the rubber sheet manufacturing apparatus according to (2) or (3), the width of the guide groove is 1.01 to 1.15% of the width of the bundled cord. The rubber sheet manufacturing apparatus is characterized by the above.
(5) The present invention provides the rubber sheet manufacturing apparatus according to any one of the above (1) to (4), wherein the rolling means is a rolling roller, and the second guide member is positioned in the vicinity of the rolling roller. This is a rubber sheet manufacturing apparatus characterized by the above.
(6) In the rubber sheet manufacturing apparatus according to (5), the second guide member is a guide roller, and the second guide roller is provided on a circumference of the guide roller. The rubber sheet manufacturing apparatus is characterized in that it has continuous guide grooves deeper than the diameter, and the winding angle of the cord around the guide roller is within 90 degrees.
(7) In the rubber sheet manufacturing apparatus according to (5) or (6), the present invention is such that the second guide member, the guide member, and the rolling means are each arranged substantially linearly. The rubber sheet manufacturing apparatus is characterized by the above.
(8) The present invention is a method for producing a rubber sheet by topping rubber on an untwisted cord, and forming a bundle cord by horizontally arranging a plurality of the cords supplied from a cord supply device, A cord comprising: a step of position-regulating a plurality of bundle-shaped cords formed so that a distance between the bundle-like cords is constant; and a step of topping rubber on the position-regulated bundle-like cord. It is a manufacturing method of an entering rubber sheet.

  According to the present invention, when topping untwisted cords, the rubber is bundled with a guide member prior to rolling to form a bundled cord, and the pitch of the bundled cords is aligned. A cordless non-twisted corded rubber sheet can be formed in a state where the pitch between the bundled cords is kept uniform.

FIG. 1A is a schematic side view of an essential part of a production apparatus for a rubber sheet with an untwisted cord according to an embodiment of the present invention, and FIG. It is a front view of a guide roller. It is sectional drawing of a bundled cord. It is a top view of the manufacturing apparatus of the rubber sheet containing a non-twisted cord shown in FIG. 1A. FIG. 5A is a schematic side view of an essential part of an apparatus for producing a rubber sheet with an untwisted cord according to another embodiment of the present invention, and FIG. 5B is an enlarged side view of a second guide roller. It is sectional drawing of the rubber sheet containing a non-twisted cord. It is a perspective view of the manufacturing apparatus of the conventional corded rubber sheet.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1A is a schematic side view of an essential part of an apparatus for manufacturing an untwisted corded rubber sheet, for example, a tire reinforcing sheet, according to an embodiment of the present invention, and FIG. 1B is an enlarged side view of a first guide roller.
The apparatus for producing a non-twisted cord-containing rubber sheet according to the present embodiment includes a plurality of reels 10A that are rotatably mounted on a reel device 10 that is a cord supply device, and a cord that has been unwound from the reel 10A. The pulling / braking device 12, the guide roller 20 which is a bundled cord forming means for bundling and aligning the cord C drawn from the braking device 12, and the rubber G 1 and G 2 to the cord C bundled by the guide roller 20. It consists of a pair of calendar devices 30 and 31 which are rolled and topped, that is, upper and lower two stages.

  As shown in FIG. 2, the guide roller 20 has circumferential grooves 20A (groove depth: D2) that are four continuous guide grooves deeper than the diameter (R1) of the cord so that the wound cord does not come off. It is formed at equal intervals (D1), and four untwisted cords C fed from the brake device 12 are bundled in parallel to form a bundled cord, as shown in FIG. 1B. The winding angle θ1 of the untwisted cord is arranged at a position within a predetermined angle of 90 degrees. The guide groove is not limited to four, but may be about 3-10.

The width of the guide groove 20A is 1.01 to 1.15% of the width of the bundled cord. Here, if the width of the guide groove 20A is less than 1.01% of the width of the bundled cord, the bundled cord hardly enters the guide groove 20A, and the cord of the bundled cord may overlap in the groove. Further, if it exceeds 1.15%, gaps are formed between the cords constituting the bundle cord, and the gaps may be non-uniform.
The position of the guide roller 20 is provided at a position where the winding angle θ1 is within 90 degrees with respect to the cord aligning portion or the brake device 12 and the rolling rolls 30B and 31B of the calendar device. Compared to untwisted cords, bundle cords have a large number of cords and are easily bent, and cord disturbance is likely to occur. In order to solve this problem, the wrapping angle of the cord C around the guide roller 20 is defined, the deflection of the cord C is suppressed, and the cord disturbance is prevented. The winding angle θ1 can be adjusted, for example, by adjusting the position of the guide roller 20 in the vertical direction.

  The position of the guide roller 20 in the horizontal plane is on a straight extension line with respect to the cord aligning portion or the brake device 12 and the rolling rolls 30B and 31B, that is, the position of the guide roller 20 is θ1. Is preferably close to 0 degrees. This arrangement of the guide roller 20 is the best arrangement for preventing the cord from bending.

  As shown in FIG. 3, the bundled cord made of the untwisted cord C is shown as one bundle formed by a plurality of metal wires arranged in parallel in the horizontal direction, here four metal wires, The number of metal wires constituting one bundle is preferably 2-6. When the number of metal wires in one bundle is 7 or more, it is difficult to arrange them in parallel in the belt ply with a certain interval in the width direction as a bundle aligned in parallel without twisting them, Productivity decreases. Therefore, from the viewpoint of both durability as a tire and productivity as a member, in practice, the most effective number of metal wires in a bundle is 3 to 4.

FIG. 4 is a plan view of the rubber sheet manufacturing apparatus shown in FIG. 1A.
In the present embodiment, the respective cords C rewound from the four reels 10A of the reel device 10 are fed to the guide roller 20 in a bundle through the cord aligning device or the brake device 12, and the guide roller 20 Are fed between the rolling rolls 30B and 31B of the calender devices 30 and 31, which are the production devices for the rubber sheets with cords, in a state where the distance between the bundle cords is constant (D1). Here, topping of the rubbers G1 and G2 is performed. The formed non-twisted corded rubber sheet S is drawn out to the outside through the roller 40.

FIG. 5A is a side view schematically showing another embodiment of the cord rolling apparatus.
The cord rolling apparatus according to the second embodiment is different from the first embodiment shown in FIG. 1A in that the second guide roller 21 as the second guide member is viewed in the cord supply direction and the rolling rolls 30B and 31B. (The other configuration of the second embodiment is the same as the configuration of the first embodiment).
In this case, as shown in an enlarged view at the lower right of FIG. 5A, from the line connecting the centers of the rolling rollers 30B or 31B of the guide roller 21 that is the second guide member, to the center position of the guide roller 21 It is preferable that the distance D3 is positioned (or arranged) in the vicinity of the rolling roller 30B or 31B (here, it is positioned so as not to contact the rolling roller 30B or 31B). By positioning the second guide roller 21 in this manner, the pitch of the bundled cord can be kept more constant, and variations between the cords of the bundled cord can be further prevented. Further, if the second guide roller 21 is provided when the rolling roller 30B or 31B is separated from the immediately preceding position, the effect of preventing the variation between the cords of the bundled cord becomes less remarkable.

Further, as shown in FIG. 5B, by arranging the winding angle θ2 of the cord around the guide aligning portion or the guide roller 20 close to the brake device 12 and the guide roller 21 close to the rolling roller to be within 90 degrees, The bending of the cord can be effectively prevented.
Since the winding angle θ2 can also be adjusted by adjusting the position of the guide roller 21 in the vertical direction, the winding angles θ1 and θ2 are close to 0 degrees, respectively, and the guide roller 21 close to the rolling rolls 30B and 31B and the cord It arrange | positions so that the 1st guide roller 20 close | similar to an alignment part may become a straight line. By doing in this way, the bending of a code | cord | chord can be suppressed and the rubber sheet without a cord disorder | damage | failure can be created.

Next, a tire cord rolling method using the tire cord rolling apparatus described above will be described.
A cord C made of a metal wire unwound from each reel 10A of the reel device 10 is drawn out through an aligning device or a brake device 12, and is formed into a bundle of four bundles by each guide groove 20A of the guide roller 20. Then, the position is regulated by being guided by the winding angle (θ1), and in that state (Embodiment 1) or further, the position is regulated by being guided by the winding angle (θ2) by the second guide roller 21 (Embodiment 2). ), Between the rolling roller pairs 30B and 31B of the calendar devices 30 and 31. That is, the code C introduced between the rolling rollers 30B and 31B is, therefore, the topping rubber G1, which is introduced between the conveying roller 30A and the rolling roller 30B and between the conveying roller 31A and the rolling roller 31B and is rolled into a sheet shape, It is introduced between the G2 sheets and is subjected to a topping process by rolling to obtain a reinforcing rubber sheet, for example, a corded sheet.

In the above description, the cord is described as a metal wire. However, the cord is not limited to this, and may be a cord made of a known organic fiber, for example. Further, the topping device is not limited to a device using a calendar device, and for example, in a device using a rubber-coated head described in Patent Document 2, a guide roller may be provided between the rubber-coated head and the rolling roller. .
Furthermore, the rubber sheet with untwisted cords to be manufactured is not limited to one in which the cords whose cross sections are shown in FIG. 6A are arranged one by one on a plane, but may be two layers as shown in FIG. 6B. Good. When arranged in two layers, it is desirable that the upper and lower bundles are shifted from each other in the lateral direction as shown.

  DESCRIPTION OF SYMBOLS 10 ... Reel device, 10A ... Reel, 12 ... Brake device, 20, 21 ... Guide roller, 20A ... Circumferential groove (guide groove), 30, 31 ... Calendar device, 30A, 31A ... Conveying roller, 30B, 31B ... Rolling roller, C ... Cord, G1, G2 ... Rubber, S ... Rubber sheet.

Claims (8)

A device for producing a rubber sheet with a cord by topping rubber to a cord supplied from a cord supply device,
Guide means for horizontally arranging the supplied cords to form a non-twisted bundle cord bundled into a plurality of cords, and to guide the position regulated so that the interval between the formed bundle cords is constant. An apparatus for producing a corded rubber sheet, comprising: a guide member having a roll; and a rolling means for topping rubber onto a bundled cord fed from the guide member. In the rubber sheet manufacturing apparatus according to claim 1,
The guide member is a guide roller, and the guide means is a continuous guide groove provided on a circumference of the guide roller and deeper than the diameter of the cord, and a winding angle of the bundled cord with respect to the guide roller Is an apparatus for producing a rubber sheet, which is within 90 degrees. In the rubber sheet manufacturing apparatus according to claim 1 or 2,
The rubber sheet manufacturing apparatus, wherein the guide member, the bundled cord forming means, and the rolling means are arranged substantially linearly. In the rubber sheet manufacturing apparatus according to claim 2 or 3,
The rubber sheet manufacturing apparatus according to claim 1, wherein a width of the guide groove is 1.01 to 1.15% of a width of the bundled cord. In the rubber sheet manufacturing apparatus according to any one of claims 1 to 4,
The apparatus for manufacturing a rubber sheet, wherein the rolling means is a rolling roller, and the second guide member is positioned in the vicinity of the rolling roller. In the rubber sheet manufacturing apparatus according to claim 5,
The second guide member is a guide roller, and the second guide roller is provided on a circumference of the guide roller and has a continuous guide groove deeper than a diameter of the cord, and the cord An apparatus for producing a rubber sheet, wherein a winding angle with respect to a guide roller is 90 degrees or less. In the rubber sheet manufacturing apparatus according to claim 5 or 6,
The rubber sheet manufacturing apparatus, wherein the second guide member, the guide member, and the rolling means are arranged substantially linearly. A method of manufacturing a rubber sheet by topping rubber on a non-twisted cord,
A step of horizontally arranging the plurality of cords supplied from the cord supply device to form a bundled cord, and restricting the position so that the interval between the bundled cords of the plurality of bundled cords formed is constant; And a step of topping rubber onto the position-regulated bundle-like cord.

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