JP2006255980A - Method and apparatus for manufacturing cord reinforcing material and tire constituent material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a cord reinforcing material capable of enhancing productivity by improving the size replacing work of a throat at the time of manufacture of cord reinforcing materials different in thickness, a manufacturing apparatus therefor and a tire constituent material. <P>SOLUTION: In the manufacturing method of the cord reinforcing material and the manufacturing apparatus therefor, a plurality of cords (s), which are coated with the rubbery elastic material extruded from an extrusion head 4 by feeding the rubbery elastic material through the shape prescribing holes 12 of the throat 13 mounted in the extrusion head 4 of an extruder 1, are molded into a predetermined shape to manufacture the cord reinforcing material X. The throat 13 is constituted of the slot main body 14 mounted on the extrusion head 4 and the throat auxiliary body 15 having shape prescribing holes 12 and fixed to the throat main body 14 in a freely detachable manner. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method and an apparatus for manufacturing a cord reinforcing material, and a tire constituent material manufactured by the manufacturing method, and more particularly, to improve a throat changing operation when manufacturing cord reinforcing materials having different thicknesses. The present invention relates to a method and an apparatus for manufacturing a cord reinforcing material and a tire constituent material.

  Examples of the cord reinforcing material include tire constituent materials such as a belt material used for a belt layer of a pneumatic tire and a carcass material used for a carcass layer. This tire constituent material has a sheet shape in which a plurality of reinforcing cords arranged at predetermined intervals are covered with unvulcanized rubber, and a plurality of tire cords covered with unvulcanized rubber extruded from an extrusion head. The cord is formed into a predetermined sheet shape by passing through a shape-defining hole of a throat mounted in the extrusion head. (For example, refer to Patent Document 1).

When manufacturing tire components with different thicknesses, it is necessary to replace the throat with a corresponding throat, but changing the throat mounted in the extrusion head is cumbersome and takes time to change. As a result, there is a problem that the downtime of the apparatus becomes longer and the productivity is hindered.
JP 2004-25597 A

  An object of the present invention is to provide a method and an apparatus for manufacturing a cord reinforcing material and a tire constituent material that can improve the throat changeover operation when manufacturing cord reinforcing materials having different thicknesses and can increase productivity. There is.

  The cord reinforcing material manufacturing method of the present invention that achieves the above object is coated with a rubber-like elastic material extruded from an extrusion head by transporting the inside of a throat shape defining hole mounted in the extrusion head of the extruder. In the method of manufacturing a cord reinforcing material by forming a plurality of cords into a predetermined shape, the throat has a throat main body to be attached to the extrusion head, and the shape defining hole, and is detachable from the throat main body. And a plurality of cords coated with the rubber-like elastic material are formed into a predetermined shape through a shape defining hole of the throat auxiliary body.

  The cord reinforcing material manufacturing apparatus of the present invention includes a plurality of cords coated with a rubber-like elastic material extruded from an extrusion head by conveying the inside of a throat shape defining hole mounted in the extrusion head of the extruder. In a device for manufacturing a cord reinforcing material by forming a cord reinforcing material into a predetermined shape, the throat has a throat main body to be attached to the extrusion head, and a throat that is removably fixed to the throat main body. It consists of an auxiliary body.

  The tire constituent material of the present invention is manufactured by the above manufacturing method.

  According to the above-described present invention, since the throat includes the throat main body to be mounted on the extrusion head and the throat auxiliary body having the shape defining hole and detachably fixed to the throat main body, the cords having different thicknesses Since only the throat auxiliary body needs to be replaced at the time of the changeover work when manufacturing the reinforcing material, the throat changeover work becomes easy. Therefore, it is possible to increase the productivity by shortening the time required for the changeover work.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows an embodiment of an apparatus for producing a cord reinforcing material according to the present invention, wherein 1 is an extruder, 2 is a feeding section for feeding cords s such as steel cords and organic fiber cords to the extruder 1, 3 Is a winding portion for winding the cord reinforcing material X covered with the extruder 1. Note that the code s referred to here includes a single wire formed by twisting a plurality of strands and a single strand.

  The extruder 1 has an extrusion head 4 that extrudes a rubber-like elastic material such as unvulcanized rubber, and an extruder main body 5 that sends out the rubber-like elastic material to the extrusion head 4 using a screw. A die insert 6 for aligning a plurality of cords s is provided in the extrusion head 4 as shown in FIG.

  The die insert 6 is disposed on the rear side of the throat 13 in the code conveying direction, which will be described later, and is configured such that the lower surface 7a of the upper die 7 and the upper surface 8a of the lower die 8 are joined together by a bolt (not shown). On the lower surface 7a of the upper die 7 and the upper surface 8a of the lower die 8, a plurality of semi-circular cord grooves 9a and 9b for aligning the cords s are provided from one end to the other end (from the rear end to the front end in the code carrying direction). Is formed. The plurality of code grooves 9a and 9b are arranged at predetermined intervals in the width direction of the die insert 6, and are arranged so that the code grooves 9a and 9b having upper and lower semicircular cross sections face each other. The plurality of cord holes 9 are arranged at predetermined intervals in the width direction. The die insert 6 is fixed in the extrusion head 4 by upper and lower holding members 10 and 11.

  As shown in FIGS. 2 and 3, a throat 13 having a shape defining hole 12 for defining a cross-sectional dimension of the cord reinforcing material X is mounted in the extrusion head 4 on the code conveying direction side of the die insert 6. The throat 13 includes a throat main body 14 attached to the extrusion head and a throat auxiliary body 15 having a shape defining hole 12 and detachably fixed to the throat main body 14.

  The throat main body 14 includes upper and lower main body portions 14A and 14B, and the throat auxiliary body 15 includes upper and lower auxiliary body portions 15A and 15B. A concave portion 16 for accommodating the upper auxiliary body portion 15A is formed from the tip surface (tip surface on the code transport direction side) 14A1 to the lower surface 14A2 of the upper body portion 14A. A concave portion 17 for accommodating the lower auxiliary body portion 15B is provided from the distal end surface (the distal end surface on the code conveying direction side) 14B1 to the upper surface 14B2 of the lower main body portion 14B. The throat auxiliary body 15 is fitted into a concave portion formed by combining the upper and lower concave portions 16 and 17.

  On the lower surface 15A1 of the upper auxiliary body portion 15A and the upper surface 15B1 of the lower auxiliary body portion 15B, the upper and lower concave grooves 18 and 19 forming the shape defining hole 12 are from one end to the other end (from the rear end to the front end in the code conveying direction). The shape defining hole 12 is formed by combining the upper and lower concave grooves 18 and 19.

  Upper and lower grooves 20 and 21 communicating from one end to the recesses 16 and 17 are formed on the lower surface 14A2 of the upper body 14A and the upper surface 14B2 of the lower body 14B, and the upper and lower grooves 20 and 21 are combined. The introduction hole 22 formed thereby communicates with the shape defining hole 12 of the throat auxiliary body 15.

  In the example shown in FIG. 3, the shape defining hole 12 has a parallelogram shape in cross section, but can be appropriately set according to the cross sectional shape of the cord reinforcing material to be manufactured. Further, since the shape defining hole 12 in FIG. 3 is configured by combining the concave grooves 18 and 19 having the same groove depth, the cord reinforcing material X molded through the shape defining hole 12 is embedded in the cord. The distance from s to the upper and lower surfaces is substantially the same, and the embedded cord s has a non-uniform thickness structure that does not deviate in the thickness direction. However, as shown in FIG. In addition, the shape defining hole 12 may be configured, and the cord reinforcing material X having an uneven thickness structure having different distances from the embedded cord s to the upper and lower surfaces may be formed.

  A metal cover 24 for closing the recesses 16 and 17 and fixing the throat auxiliary body 15 accommodated in the recesses 16 and 17 to the throat main body 14 is provided on the front end side of the extrusion head 4. The cover 24 is detachably fixed to the distal end surface 4a of the extrusion head 4 by fastening means such as a bolt 23 so as to contact the distal end surfaces 14A1 and 14B1 of the upper and lower body portions 14A and 14B. By removing the bolt 23 and removing the cover 24, the throat auxiliary body 15 accommodated in the recesses 16 and 17 is removed from the throat main body 14, and another throat auxiliary provided with the shape defining holes 12 having different thicknesses (heights). It can be easily exchanged with the body.

  An opening 25 larger than the shape defining hole 12 is formed at the center of the cover 24, and the cord reinforcing material X that has been shaped into a predetermined shape through the shape defining hole 12 passes through the opening 25 and the winding unit 3. To be transported.

  Between the upper and lower holding members 10, 11 and the throat 13, the upper and lower parts for supplying the rubber-like elastic material extruded from the extruder 1 to the plurality of cords s that have passed through the cord hole 9 of the die insert 6. Supply paths 26 and 27 are formed. A rubber-like elastic material is simultaneously supplied from the upper and lower supply paths 26 and 27, and a plurality of cords s aligned by the die insert 6 can be simultaneously covered from both the upper and lower directions intersecting the code conveying direction.

  The supply unit 2 accommodates a plurality of reels 31 on which a cord s is wound around a stand (not shown), and supplies the plurality of cords s aligned in the horizontal direction to the extruder 1 through alignment guide rolls 32 and 33. It is configured to do.

  The winding unit 3 includes a winding roll 34 that winds the cord reinforcing material X formed into a predetermined shape. A cord s wound around a reel 31 by an unillustrated driving means is unwound and conveyed into the extrusion head 4 of the extruder 1, and the cord formed by coating the rubber-like elastic material with the extrusion head 4 into a predetermined shape. The reinforcing material X is wound around the winding roll 34 via the guide roll 35.

  Hereinafter, the manufacturing method of the cord reinforcing material of the present invention will be described with reference to the above-described manufacturing apparatus of the cord reinforcing material.

  First, the cord s is pulled out from the reel 31 and set. That is, the cord s drawn from the reel 31 is passed through the cord hole 9 of the die insert 6 and the shape defining hole 12 of the throat 13 via the alignment guide rolls 32 and 33, and further passed to the winding roll 34 via the guide roll 35. Lock.

  In this state, the apparatus is operated. The cord s is unwound from the reel 31 and is conveyed in the extrusion head 4 in the horizontal direction. When the plurality of cords s to be conveyed pass through the cord holes 9 of the die insert 6 and are aligned, they are covered with a rubber-like elastic material that is simultaneously supplied from the upper and lower supply paths 26 and 27. The coated plural cords s are then conveyed through the shape defining hole 12 of the throat auxiliary body 15 to be formed into a cord reinforcing material X having a predetermined shape.

  The cord reinforcing material X that has passed through the shape defining hole 12 passes through the opening 25 of the cover 24 and is wound around the winding roll 34 via the guide roll 35.

  According to the present invention described above, the throat 13 includes the throat main body 14 that is mounted on the extrusion head 4 and the throat auxiliary body 15 that has the shape defining hole 12 and is detachably fixed to the throat main body 14. When manufacturing the cord reinforcing material X having different thicknesses, it is only necessary to replace the throat auxiliary body 15 without replacing the entire throat 13, so that the throat 13 can be easily changed, and the time required for the replacement is reduced. It can be shortened to increase productivity.

  5-7 shows the other example of the die insert 6 used for the manufacturing apparatus of the cord reinforcement material of this invention. In the die insert 6, the lower mold 8 has a protruding portion 8 b that protrudes more toward the code conveying direction than the upper mold 7. A portion 9b1 of the cord groove 9b formed on the upper surface 8a where the protruding portion 8b is located is exposed, and the portion 9b1 of the cord groove 9b where the die insert 6 is exposed following each cord hole 9 is directed to the code conveyance direction side. It is the composition which has.

  A plurality of cords s passing through the portion 9b1 of the cord groove 9b exposed from the cord hole 9, is exposed in one direction facing the portion 9b1 of the cord groove 9b, that is, from the upper supply path 26, and is a rubber-like elastic material. The rubber-like elastic material can be supplied to the plurality of cords s from the other direction, that is, the lower supply passage 27 at a position immediately after passing through the exposed portion 9b1 of the cord groove 9b. .

  In the cord reinforcing material manufacturing apparatus using the die insert 6 shown in FIGS. 5 to 7, while the plurality of cords s that are conveyed exit the cord hole 9 of the die insert 6 and pass through the portion 9 b 1 of the cord groove 9 b. Further, a rubber-like elastic material is supplied from one direction facing the portion 9b1 of the cord groove 9b in both directions intersecting the cord conveying direction, that is, from the upper supply passage 26, and the upper side of the plurality of cords s is covered. The At the time of this covering, the cord s is in an aligned state in the cord groove 9b, so that cord disturbance is suppressed.

  Next, a rubber-like elastic material is supplied to the plurality of cords s immediately after passing through the portion 9b1 of the cord groove 9b from the other direction, that is, from the lower supply path 27, and the lower side of the plurality of cords s is covered. . At this time, since the plurality of cords s are already covered on the upper side and the positions are fixed, the lower side is covered without causing a large cord disturbance by the rubber-like elastic material supplied from the lower supply path 17. Is done.

  The plurality of cords s sequentially covered with the rubber-like elastic material are passed through the shape defining hole 12 of the throat auxiliary body 15 of the throat 13 and formed into a cord reinforcing material X having a predetermined shape and wound up in the same manner as described above. It is wound up on a roll 34.

  According to the cord reinforcing material manufacturing apparatus using the die insert 6 shown in FIGS. 5 to 7, the die insert 6 has a portion 9 b 1 of the cord groove 9 b that is exposed following each cord hole 9 on the cord transport direction side. The rubber-like elastic material is supplied from the upper side to the plurality of cords s coming out of the cord hole 9 and passing through the portion 9b1 of the cord groove 9b, and then the plurality of cords s immediately after passing through the portion 9b1 of the cord groove 9b. Since the rubber-like elastic material is supplied from the lower side and the plurality of cords s are covered with the rubber-like elastic material, the rubber-like elastic material in which the cords s aligned in the cord groove 9b are supplied from the upper side. After the coating, the cord s whose upper side is coated and fixed in position can be coated with a rubber-like elastic material supplied from the lower side.

  As a result, the plurality of cords s to be conveyed can be covered with the rubber-like elastic material while suppressing the alignment disorder of the cords s after passing the cord holes 9 of the die insert 6. If the cord s is misaligned, the cord reinforcing material is exposed to the surface of the rubber unless the thickness of the cord reinforcing material is increased more than necessary. In this embodiment, the cord s is prevented from being misaligned. Therefore, in addition to the effects described above, it is possible to avoid the cord s from being exposed on the surface without making the thickness of the cord reinforcing material X unnecessarily thick.

  The length of the protruding portion 8b, that is, the length L of the portion 9b1 of the cord groove 9b is preferably in the range of 5 mm or more in order to more effectively suppress the disorder of the alignment of the cord s. The upper limit value is not particularly limited in terms of the disorder of the alignment of the cord s, but is preferably 10 mm or less in order to be accommodated in the existing extrusion head 4.

  As the rubber-like elastic material used for the cord reinforcing material X, one having a Mooney viscosity of 60 or less at the time of extrusion (in the upper and lower supply paths 26 and 27) is preferably used. A rubber-like elastic material can be brought into close contact with the surface of the cord s to reduce the thickness of the cord reinforcing material X. The lower limit is preferably 40 or more from the viewpoint of extrusion accuracy of the rubber-like elastic material.

  5-7, the lower mold 8 has a protruding portion 8b. However, the upper mold 7 may have a protruding portion having a cord groove 9a. . In that case, the rubber-like elastic material is supplied from the lower supply path 27 to the plurality of cords s that have exited the cord hole 9 and are passing through the portion of the cord groove 9a, and then the plurality of cords immediately after passing through the cord groove 9a. The rubber-like elastic material is supplied to the cord s from the upper supply path 26 so that the plurality of cords s are covered with the rubber-like elastic material.

  In the present invention, in the above embodiment, the throat auxiliary body 15 of the throat 13 is detachably fixed by the cover 24, but any throat auxiliary body 15 can be fixed to the throat main body 14 in a removable manner. For example, a flange may be provided on the throat auxiliary body 15 and the flange may be detachably fixed to the throat main body 14 with a bolt or the like.

  The present invention can be preferably used for producing a cord reinforcing material used for a tire constituent material such as a belt material used for a belt layer of a pneumatic tire or a carcass material used for a carcass layer. However, the present invention is not limited thereto, and any cord reinforcing material in which a plurality of cords s are covered with a rubber-like elastic material can be applied.

It is a schematic perspective view of the manufacturing apparatus of the cord reinforcement material of this invention. It is principal part sectional drawing in an extrusion head. It is explanatory drawing which looked at the throat auxiliary body of FIG. 2 from the code conveyance direction side. It is explanatory drawing which shows the other example of a throat auxiliary body. It is an expanded sectional view showing other examples of die insert. It is an AA arrow line view of FIG. It is principal part sectional drawing in the extrusion head provided with the die insert of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Extruder 2 Supply part 3 Winding part 4 Extrusion head 6 Die insert 7 Upper mold 8 Lower mold 8b Protruding part 9 Cord hole 9a, 9b Cord groove 9b1 Part 12 Shape-defining hole 13 Throat 14 Throat body 15 Throat auxiliary body 24 Cover 26, 27 Supply path L Length X Cord reinforcement material s Cord

Claims (9)

A cord reinforcing material is formed by forming a plurality of cords covered with a rubber-like elastic material extruded from an extrusion head into a predetermined shape by conveying the inside of a shape-defining hole of a throat mounted in the extrusion head of the extruder In the method of manufacturing
The throat includes a throat main body to be mounted on the extrusion head, a throat auxiliary body having the shape defining hole and detachably fixed to the throat main body, and a plurality of the throat main bodies covered with the rubber-like elastic material A method for manufacturing a cord reinforcing material, wherein a cord of a book is formed into a predetermined shape through a shape defining hole of the throat auxiliary body.   When a die insert having a code groove exposed on the code conveying direction side in the code transport direction side following a plurality of code holes for code alignment is provided in the extrusion head, and the plurality of cords are covered with a rubber-like elastic material, the cord Immediately after passing the cord groove, the rubber-like elastic material is supplied from one direction facing the cord groove in both directions intersecting the cord conveying direction to the plurality of cords that have passed through the cord groove through the hole. The method for producing a cord reinforcing material according to claim 1, wherein a rubber-like elastic material is supplied to the plurality of cords from the other direction, and the plurality of cords are covered with the rubber-like elastic material.   The method for manufacturing a cord reinforcing material according to claim 2, wherein the length of the cord groove is 5 mm or more.   4. The method for producing a cord reinforcing material according to claim 2, wherein the Mooney viscosity at the time of extrusion of the rubber-like elastic material is 60 or less.   The method for manufacturing a cord reinforcing material according to claim 1, 2, 3, or 4, wherein the cord reinforcing material is a tire constituent material. A cord reinforcing material is formed by forming a plurality of cords covered with a rubber-like elastic material extruded from an extrusion head into a predetermined shape by conveying the inside of a shape-defining hole of a throat mounted in the extrusion head of the extruder In an apparatus for manufacturing
An apparatus for producing a cord reinforcing material, comprising: a throat main body on which the throat is attached to the extrusion head; and a throat auxiliary body having the shape defining hole and detachably fixed to the throat main body.   A die insert in which a plurality of code holes for code alignment are arranged at a predetermined interval in the width direction is disposed on the rear side in the code transport direction of the throat, and a code groove that exposes the die insert following the code hole is corded. A rubber-like elastic material is formed from one direction facing the code groove in both directions intersecting the code conveyance direction to a plurality of cords that are out of the code hole and passing through the code groove, and having a configuration having on the conveyance direction side. The cord reinforcing material manufacturing apparatus according to claim 6, wherein the rubber-like elastic material is configured to be able to be supplied from the other direction to a plurality of cords immediately after passing through the cord groove while being configured to be capable of being supplied.   The cord reinforcing material manufacturing apparatus according to claim 7, wherein a length of the cord groove is 5 mm or more. A tire constituent material manufactured by the method for manufacturing a cord reinforcing material according to claim 5.

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