JP2017170622A - Manufacturing device of rubber material with cord, manufacturing method of rubber material with cord, rubber material with cord and manufacturing method of pneumatic tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology capable of manufacturing a pneumatic tire having higher performance than conventional ones by preventing generation of overlap of tire cords in a joint part formed by an overlap joint.SOLUTION: There is provided a manufacturing device of a rubber material with a cord for manufacturing the rubber material with the cord where a plurality of tire cords are covered by a rubber, having baffle which is arranged inside of a rubber extruder and in which a plurality of baffle grooves for guiding each of the plurality of tire cords are formed with a predetermined interval, a die plate attached to a tip of the rubber extruder and having breadth with a predetermined width, and a cylinder filling a space between the baffle and the die plate with the rubber, and the baffle and the die plate are designed so as to set a distance B from an outermost side baffle groove to periphery of the breadth of the die plate 2 times or more to each interval A of the plurality of baffle grooves.SELECTED DRAWING: None

Description

  The present invention relates to a corded rubber material manufacturing apparatus, a corded rubber material manufacturing method, a corded rubber material, and a pneumatic tire manufacturing method.

  For manufacturing a pneumatic tire, a ply material having a plurality of tire cords such as a carcass ply and a breaker is used. In general, this ply material is made by covering a plurality of tire cords arranged at predetermined intervals with rubber to create a long cord-containing rubber material, and the prepared cord-containing rubber material is predetermined with respect to the tire cord. The cut piece is formed by cutting at an angle of, and then the both side edges in the width direction of the formed cut piece are overlapped and joined.

  At this time, in the ply material after production, as shown in FIG. 11, the tire cord 2 is overlapped at the joint portion J where the cut pieces S are overlapped, so that the number of cords becomes denser than the other portions, and the uniformity There is a risk of reducing the performance of pneumatic tires, such as lowering.

  Therefore, in recent years, in order to prevent the tire cords from overlapping in the joint portion, a zipper joint has been developed in which the end surfaces of the cut pieces are brought into contact with each other without overlapping the cut pieces (Patent Document 1).

Japanese Patent No. 5698241

  However, in the case of the above-described zipper joint, there is a rubber member that makes it difficult to abut the end faces with high accuracy. In such a case, it is difficult to perform an appropriate joint. In addition, a special device is required to implement the zipper joint, and it cannot be applied to a process in which the joint is manually performed by the operator.

  For this reason, there has been a demand for a manufacturing technique of a corded rubber material that does not cause overlapping of tire cords in the joint portion and does not make the number of cords dense despite the use of an overlap joint.

  Then, this invention prevents the duplication of a tire code | cord from occurring in the joint part formed of the overlap joint, and provides a technique capable of manufacturing a pneumatic tire with higher performance than before. And

The invention described in claim 1
An apparatus for producing a corded rubber material for producing a corded rubber material in which a plurality of tire cords are covered with rubber by passing a plurality of tire cords arranged at a predetermined interval through a rubber extruder. ,
A baffle provided inside the rubber extruder, wherein a plurality of baffle grooves for guiding each of the plurality of tire cords are formed at predetermined intervals;
A die plate that is attached to the tip of the rubber extruder and has an opening of a predetermined width;
A cylinder for filling rubber in the space between the baffle and the die plate;
At one edge of the front edge of the die plate, the distance B from the outermost baffle groove to the edge of the front edge of the die plate is more than doubled with respect to the interval A between the plurality of baffle grooves. Thus, the baffle and the die plate are designed to provide a corded rubber material manufacturing apparatus.

The invention described in claim 2
The corded rubber according to claim 1, wherein the distance B from the outermost baffle groove to the edge of the front edge of the die plate is 3 to 4 times with respect to the interval A between the plurality of baffle grooves. It is a material manufacturing device.

The invention according to claim 3
An apparatus for producing a corded rubber material for producing a corded rubber material in which a plurality of tire cords are covered with rubber by passing a plurality of tire cords arranged at a predetermined interval through a rubber extruder. ,
A baffle provided inside the rubber extruder, wherein a plurality of baffle grooves for guiding each of the plurality of tire cords are formed at predetermined intervals;
A die plate that is attached to the tip of the rubber extruder and has an opening of a predetermined width;
A cylinder for filling rubber in the space between the baffle and the die plate;
The baffle is formed so that the number of the baffle grooves is larger than the number of the tire cords included in the rubber material with cords after manufacture, and the opening of the die plate corresponds to the number of the baffle grooves. An apparatus for producing a corded rubber material, characterized in that it is formed in a width.

The invention according to claim 4
The apparatus for producing a corded rubber material according to claim 3, wherein the baffle is formed so that the number of the baffle grooves is one more than the number of the tire cords.

The invention described in claim 5
An apparatus for producing a corded rubber material for producing a corded rubber material in which a plurality of tire cords are covered with rubber by passing a plurality of tire cords arranged at a predetermined interval through a rubber extruder. ,
A baffle provided inside the rubber extruder, wherein a plurality of baffle grooves for guiding each of the plurality of tire cords are formed at predetermined intervals;
A die plate that is attached to the tip of the rubber extruder and has an opening of a predetermined width;
A cylinder for filling rubber in the space between the baffle and the die plate;
The positions of the baffle and the die plate are adjusted so that the center in the width direction of the region where the baffle groove of the baffle is formed is different from the center in the width direction of the front edge of the die plate. Is an apparatus for producing a corded rubber material.

The invention described in claim 6
The cord according to claim 5, wherein a distance from a center in a width direction of a region where the baffle groove of the baffle is formed to a center in the width direction of the front end of the die plate is 1 to 3 mm. It is a manufacturing apparatus of a rubber material containing.

The invention described in claim 7
A method for producing a corded rubber material for producing a corded rubber material by covering a plurality of tire cords arranged at predetermined intervals with rubber,
A corded rubber material in which an ear portion made of rubber is formed on any one of the side edges using the corded rubber material manufacturing apparatus according to any one of claims 1 to 6. Is a method for producing a corded rubber material.

The invention according to claim 8 provides:
The length of the said ear | edge part in the width direction of the said corded rubber material is 1-3 mm, The manufacturing method of the corded rubber material of Claim 7 characterized by the above-mentioned.

The invention according to claim 9 is:
A corded rubber material in which a plurality of tire cords arranged at predetermined intervals are covered with rubber,
A corded rubber material characterized in that an ear portion made of rubber is formed on any one of the side edges.

The invention according to claim 10 is:
The corded rubber material according to claim 9 is cut at a predetermined angle with respect to the tire cord, and a plurality of cut pieces in which an ear portion made of rubber is formed on one side edge portion,
A ply material is created by sequentially overlapping one side edge of the created plurality of cut pieces and the other side edge to be jointed,
A pneumatic tire manufacturing method using the prepared ply material to manufacture a pneumatic tire.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent that a tire code overlaps in the joint part formed of the overlap joint, and can provide the technique which can manufacture a pneumatic tire of higher performance than before. .

It is a figure which shows typically the ply material obtained by this invention. It is a perspective view which shows typically the manufacturing apparatus of the rubber material with a cord which concerns on the 1st Embodiment of this invention. It is a top view which shows typically the principal part of the rubber extruder of FIG. It is a side view which shows the cross-section of the principal part of the rubber extruder of FIG. It is a front view of the baffle in FIG. It is a front view of the die plate in FIG. It is a top view explaining the baffle and die plate concerning a 1st embodiment. It is a top view explaining the baffle and die plate concerning a 2nd embodiment. It is a top view explaining the baffle and die plate concerning a 3rd embodiment. It is a figure which shows the cut surface of the ply material obtained by Examples 1-3. It is a figure which shows typically the ply material obtained by a prior art. It is a top view explaining the conventional baffle and die plate.

1. Background to the Present Invention The inventor has made various studies in order to prevent the occurrence of duplication of tire cords in a joint portion formed by an overlap joint, and applied to one side edge of a cut piece before the joint. It was considered to form an ear portion where the tire cord is not arranged.

  That is, as shown in FIG. 1, the present inventor can connect the side edges of the cut piece S to each other if the ear part S1 where the tire cord 2 is not disposed is formed on one side edge of the cut piece S. It is considered that the tire cord 2 does not overlap in the joint portion J even if the tires overlap each other.

  And in order to form the ear | edge part S1 as shown in FIG. 1 in the one side edge part of the cut piece S, review of each process until it leads to a joint process, and the cord before creating the cut piece S is entered. If a rubber material with cords having ears formed on one side edge in the rubber material manufacturing process can be produced, the ears having a length sufficient for the cut piece S after cutting the rubber material with cords We thought that S1 could be formed.

  However, actually, when trying to manufacture a corded rubber material in which an ear portion is formed on one side edge, it is not easy to attach excess rubber to the side edge of the corded rubber material. I understood. Thus, further experiments and studies were made, and the corded rubber material manufacturing apparatus according to the following first to third embodiments was considered.

  Hereinafter, in order to manufacture the corded rubber material in which the ear portion is formed on one side edge portion, the manufacturing apparatus of the corded rubber material according to the first to third embodiments which the present inventors have come to consider Will be explained.

2. First Embodiment FIG. 2 is a perspective view schematically showing an apparatus for manufacturing a corded rubber material according to the first embodiment, and FIG. 3 schematically shows a main part of the rubber extruder shown in FIG. 4 is a side view showing a cross-sectional structure of the main part of the rubber extruder of FIG. 2, FIG. 5 is a front view of the baffle in FIG. 4, and FIG. 6 is a diagram of the die plate in FIG. It is a front view.

  The corded rubber material manufacturing apparatus 1 according to the present embodiment basically has the same structure as the conventional one. Specifically, as shown in FIG. 2, rubber is attached to a reel stand 8 having a plurality of reels 9 around which the tire cord 2 is wound, and each tire cord 2 unwound from the reel stand 8. A rubber extruder 5 for extruding a corded rubber material. After passing a plurality of tire cords 2 arranged at predetermined intervals through the rubber extruder 5, the rubber cord 5 is discharged from a discharge port of the rubber extruder 5. By extrusion molding, a corded rubber material 4 in which a plurality of tire cords 2 are covered with rubber is manufactured.

  However, the cord rubber material manufacturing apparatus 1 according to the present embodiment is different from the conventional rubber extruder 5 in structure. Below, after explaining the basic structure of a rubber extruder, the characteristic part in this Embodiment is demonstrated. The basic structure of the rubber extruder is the same in the second and third embodiments described later.

(1) Basic Structure of Rubber Extruder The baffle 12 is provided inside the rubber extruder 5 as shown in FIGS. 3 and 4. As shown in FIG. 5, the baffle 12 has a plurality of baffle grooves 11 formed at predetermined intervals, and the tire cords sent from the reel stand 8 (see FIG. 2) are sent to the baffle grooves 11. It is comprised so that it may guide to a desired position by making it pass to.

  As shown in FIGS. 3 and 4, the die plate 6 is a plate-like member attached to the tip of the rubber extruder 5, and the corded rubber material 4 is placed in a predetermined shape at the center of the die plate 6. A front opening 13 (see FIG. 6) for extrusion molding with dimensions is formed.

  As shown in FIG. 4, the rubber extruder 5 is provided with an internal space 5A1, and the cylinder 5A (see FIG. 2) supplies rubber G to the internal space 5A1 of the rubber extruder 5, Rubber G is filled between the die plate 6 and the baffle 12. In this state, the plurality of tire cords 2 that have been sent are guided to a predetermined position in the baffle 12 and sent out toward the opening 13 of the die plate 6 so that the tire cord 2 is covered with rubber G. The rubber material 4 is extruded.

(2) Characteristic part of this embodiment The manufacturing apparatus of the corded rubber material according to this embodiment is a conventional rubber extruder in which the baffle 12 and the die plate 6 are designed in the structure of the rubber extruder 5 described above. It is characterized by different points.

  FIG. 12 is a plan view for explaining the conventional baffle 12 and the die plate 6, and FIG. 7 is a plan view for explaining the design of the baffle 12 and the die plate 6 according to the first embodiment.

  As shown in FIG. 12, in the conventional technique, the outermost baffle groove 11a in the width direction and the die are molded in the viewpoint that the tire cord that has passed through the baffle groove 11 is extruded while being properly covered with rubber. A distance B between the edge 13a of the front opening 13 of the plate 6 is set.

  On the other hand, in the baffle 12 and the die plate 6 in the present embodiment shown in FIG. 7, the tire cord is not disposed at one side edge portion of the rubber material containing the cord after the extrusion molding with the distance B described above. It is set from the viewpoint of forming the ear.

  Specifically, in the present embodiment, the outermost baffle groove 11 a and the die plate 6 gap 13 at one edge of the gap 13 of the die plate 6 with respect to the interval A between the baffle grooves 11. The distance B in the width direction between the edge 13a and the edge 13a is designed to be twice or more.

  When the baffle 12 and the die plate 6 designed under such conditions are used, the tire cord guided to the outermost baffle groove 11a at one of the side edges of the rubber material with cord after manufacture is used. In addition, an ear portion having a length twice or more as long as the cord interval can be formed outside.

  When the rubber material with a cord formed with such an ear portion is cut at a predetermined angle with respect to the tire cord to create a cut piece, the tire cord 2 is not disposed, and the ear is composed only of rubber. A cut piece having a portion formed on one side edge portion is obtained.

  When the cut pieces are jointed, the side edge portion where the ear portion is formed overlaps with the side edge portion where the ear portion is not formed, so that the tire at the joint portion J as shown in FIG. A ply material without duplication of code 2 is obtained.

  And a pneumatic tire can be manufactured by laminating | stacking the obtained ply material and other rubber members, such as an inner liner and a tread, shape | molding a raw tire, and vulcanizing this raw tire. In the pneumatic tire manufactured in this manner, tire cords are not overlapped at the joint portion of the ply material, so that a decrease in uniformity is suppressed and the tire performance is improved as compared with the conventional tire.

  As for the length of the ear portion, if the value exceeds a predetermined value (about 5 mm), the effect is saturated, and the cost for forming the ear portion only increases, so the outermost baffle groove 11a in the width direction and The distance B between the die plate 6 and the edge 13a of the opening 13 is preferably set to 3 to 4 times the interval A between the baffle grooves, and more preferably about 3 times.

  For example, when manufacturing a ply material for a passenger car, generally, a corded rubber material having a width of about 500 mm in which 32 tire cords are arranged at intervals of 1 mm is manufactured. In order to form an ear of about 3.0 mm in the rubber material containing the cord, the distance B to the edge 13a of the front opening 13 of the die plate 6 is set to 3 times the interval A (about 1.0 mm) of the baffle groove. To do. As a result, a ply material for a passenger car can be manufactured in which the tire cord does not overlap in the joint portion.

3. Second Embodiment Next, as another method for obtaining a cut piece S in which an ear S1 is formed on one side edge as shown in FIG. 1, a cord according to a second embodiment is included. A rubber material manufacturing apparatus will be described.

  The corded rubber material manufacturing apparatus according to the second embodiment uses a baffle having more baffle grooves than the number of tire cords of the corded rubber material to be manufactured, and has dummy baffle grooves that do not allow the tire cord to pass through. It is characterized by providing.

  FIG. 8 is a plan view for explaining the baffle 12 and the die plate 6 according to the second embodiment. In FIG. 8, a baffle 12 is used in which the number of baffle grooves 11 is one greater than the number of tire cords of corded rubber material to be manufactured, and the baffle groove 11 formed one more is a dummy baffle groove 11b. It becomes.

  In the present embodiment, the width of the opening 13 of the die plate 6 is formed so as to correspond to the number of all the baffle grooves 11 including the dummy baffle grooves.

  When the corded rubber member with the ears formed is manufactured using the corded rubber material manufacturing apparatus according to the present embodiment, the baffle groove 11b formed on the outermost side in the width direction of the baffle 12. Is a dummy baffle groove 11b through which the tire cord does not pass. That is, when the tire cord is passed through the baffle groove 11 excluding the dummy baffle groove 11b and the rubber material containing the cord is extruded, the edge of the opening 13 of the die plate 6 from the baffle groove 11a adjacent to the dummy baffle groove 11b. Since the distance to 13a can be sufficiently secured, as in the first embodiment described above, at any one of the side edge portions of the cord-containing rubber material after manufacture, than the outermost tire cord. A sufficiently long ear can be formed on the outside.

  Note that, as described above, the width of the opening 13 of the die plate 6 in the present embodiment is set to a width corresponding to the number of the baffle grooves 11, but specifically, the following expression (1) is satisfied. Such a width is preferable. Thereby, the ear | edge part of sufficient length can be easily formed in either one of the side edge parts of the rubber material containing a cord after manufacture.

Width of die plate opening = width of formation region of baffle groove including dummy groove C + α + β (1)
α: Joint overlap amount of the strip β: Length of the rubber adhered to the side edge where the ear is not formed (see FIG. 1)

  For example, when manufacturing a corded rubber material having a width of 288 mm in which 36 steel cords that are corded rubber materials for a breaker are arranged at intervals of 0.83 mm, one dummy baffle groove is created, The interval between the baffle grooves is set to 0.83 mm. In the above formula (1), α is set to 2.0 mm, β is set to 0.34 mm, and the width of the front edge of the die plate is designed. Thereby, the rubber material with a cord in which the ear | edge part about 2.0 mm wide was formed can be manufactured.

4). Third Embodiment In the third embodiment, by adjusting the positions of the baffle and the die plate inside the rubber extruder, it is sufficient for either one of the side edges of the corded rubber material after manufacture. Form a long ear. FIG. 9 is a plan view for explaining the baffle 12 and the die plate 6 according to the third embodiment.

  Specifically, in the conventional apparatus as shown in FIG. 12, the baffle 12 is disposed so that the center in the width direction of the region where the baffle groove 11 is formed coincides with the center in the width direction of the frontage 13. Is done. On the other hand, in the third embodiment, as shown in FIG. 9, the center CL1 in the width direction of the region where the baffle groove 11 of the baffle 12 is formed is the width direction of the opening 13 of the die plate 6. The positions of the baffle 12 and the die plate 6 are adjusted to be different from the center CL2.

  Thus, by shifting the center CL1 of the region of the baffle groove 11 and the center CL2 of the opening 13 of the die plate 6, the distance D from the outermost baffle groove 11c to the edge 13a of the opening 13 of the die plate 6 is set. Since it can be sufficiently secured, as in the above-described embodiment, a sufficient length is provided on the outer side of the outermost tire cord at either one of the side edges of the rubber material with cord after manufacture. Ears can be formed.

  In addition, regarding the amount of shifting the center CL1 and the center CL2 described above, an ear portion that can be appropriately overlapped without overlapping codes is formed on one side edge portion, and the ear portion is not formed. From the viewpoint of forming an appropriate rubber region so that the tire cord is not exposed at the side edge of the other side, adjustment is appropriately made. In general, the amount by which the center CL1 and the center CL2 are shifted is preferably set to 1 to 3 mm.

  Hereinafter, based on an Example, this invention is demonstrated more concretely.

1. Examples and Comparative Examples (1) Example 1
Based on the first embodiment described above, a corded rubber material having a thickness of 1.20 mm was manufactured using a baffle and a die plate in which the distance B shown in FIG. Specifically, a steel cord is used as a tire cord, and the condition of the steel cord is set to 2 + 2 × 0.23HT, 38 ends (22 pieces, interval A1.25 mm), and the side edge on which the ear portion is not formed is set. The opening of the die plate was set to 31.96 mm so that the width β of the rubber adhered to the part was 2.0 mm.

(2) Example 2
Based on the second embodiment described above, one dummy baffle groove 11b is provided in the baffle 12 as shown in FIG. 8, and the front opening 13 of the die plate 6 is replaced with a dummy on the basis of the above equation (1). The size (width: 27.63 mm) corresponding to all the baffle grooves 11 and 11b including the baffle groove 11b was designed, and a rubber material with a cord was produced using the baffle 12 and the die plate 6. The conditions excluding this point were set the same as in Example 1.

(3) Example 3
Based on the third embodiment described above, the baffle 12 is arranged so that the center CL1 of the formation region of the baffle groove 11 and the center CL2 of the opening 13 of the die plate 6 are shifted by 0.66 mm as shown in FIG. A corded rubber material was prepared, and the same conditions as in Example 1 were set except that the width of the opening 13 of the die plate 6 was adjusted to 31.96 mm.

(4) Comparative Example A conventional baffle and a die plate as shown in FIG. 12 were used, and the same conditions as in Example 1 were set except that the opening of the die plate was set to 32 mm.

2. Evaluation (1) Evaluation Method The rubber materials with cords obtained in Examples 1 to 3 and the comparative example were cut at an angle of 60 ° with respect to the tire cord, respectively, and the side edges of the cut pieces after cutting were approximately A ply material for a breaker was produced by jointing with an overlap amount of 2 mm. In Examples 1 to 3, two types of breaker ply materials having a width of 316 mm and a width of 288 mm were produced, and in the comparative example, a ply material for a breaker having a width of 288 mm was produced.

  And after vulcanizing the produced ply material, the ply material is cut along the longitudinal direction, the cut surface is visually observed, the duplication of tire cords at the joint portion occurs, and the number of cords becomes dense Evaluated whether or not.

  In addition, a pneumatic tire is produced using the produced ply material, and the distance between the tire cords in the produced tire is inspected by an X-ray inspection apparatus, and the tire cord is cut at a joint portion of the ply material by cutting in a radial direction. It was visually confirmed whether or not duplication occurred.

(2) Evaluation result As a result of observing the cut surface of the ply material after creation, as shown in FIG. 10, in each of Examples 1 to 3, the tire cords 2 are arranged at a similar interval. In the portion J1 where the joint portion was formed, the tire cords did not overlap. On the other hand, in the comparative example, it was confirmed that the tire cords were overlapped at locations where the joint portions were formed, and the cord density was dense.

  Similarly, in the tires after production, in Examples 1 to 3, duplication of tire cords was not confirmed in both the inspection by the X-ray inspection apparatus and the visual inspection of the cut surface, and duplication occurred in the comparative example. I was able to confirm the part.

  From the above results, by using the apparatus described in the first to third embodiments, a corded rubber material in which an ear portion is formed on one side edge portion is used, so that the tire in the joint portion It was confirmed that it was possible to manufacture pneumatic tires with higher performance than before by preventing the occurrence of duplication of cords.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above-described embodiments. Various modifications can be made to the above-described embodiment within the same and equivalent scope as the present invention.

DESCRIPTION OF SYMBOLS 1 Production apparatus of corded rubber material 2 Tire cord 4 Corded rubber material 5 Rubber extruder 5A Cylinder 5A1 Internal space 6 Die plate 8 Reel stand 9 Reel 11, 11a, 11b, 11c Baffle groove 12 Baffle 13 Front port 13a Front edge A Baffle groove spacing B, D Distance from outermost baffle groove to edge of edge C Baffle groove formation area width CL1 Baffle groove formation area width direction center CL2 Frontage width direction center G Rubber J Joint Part J1 The part where the joint part was formed S Cut piece S1 Ear part

Claims (10)

An apparatus for producing a corded rubber material for producing a corded rubber material in which a plurality of tire cords are covered with rubber by passing a plurality of tire cords arranged at a predetermined interval through a rubber extruder. ,
A baffle provided inside the rubber extruder, wherein a plurality of baffle grooves for guiding each of the plurality of tire cords are formed at predetermined intervals;
A die plate that is attached to the tip of the rubber extruder and has an opening of a predetermined width;
A cylinder for filling rubber in the space between the baffle and the die plate;
At one edge of the front edge of the die plate, the distance B from the outermost baffle groove to the edge of the front edge of the die plate is more than doubled with respect to the interval A between the plurality of baffle grooves. Thus, the said baffle and said die plate are designed, The manufacturing apparatus of the rubber material with a cord characterized by the above-mentioned.   The corded rubber according to claim 1, wherein the distance B from the outermost baffle groove to the edge of the front edge of the die plate is 3 to 4 times with respect to the interval A between the plurality of baffle grooves. Material production equipment. An apparatus for producing a corded rubber material for producing a corded rubber material in which a plurality of tire cords are covered with rubber by passing a plurality of tire cords arranged at a predetermined interval through a rubber extruder. ,
A baffle provided inside the rubber extruder, wherein a plurality of baffle grooves for guiding each of the plurality of tire cords are formed at predetermined intervals;
A die plate that is attached to the tip of the rubber extruder and has an opening of a predetermined width;
A cylinder for filling rubber in the space between the baffle and the die plate;
The baffle is formed so that the number of the baffle grooves is larger than the number of the tire cords included in the rubber material with cords after manufacture, and the opening of the die plate corresponds to the number of the baffle grooves. An apparatus for producing a corded rubber material, characterized by being formed in a width.   The apparatus for producing a corded rubber material according to claim 3, wherein the baffle is formed so that the number of the baffle grooves is one more than the number of the tire cords. An apparatus for producing a corded rubber material for producing a corded rubber material in which a plurality of tire cords are covered with rubber by passing a plurality of tire cords arranged at a predetermined interval through a rubber extruder. ,
A baffle provided inside the rubber extruder, wherein a plurality of baffle grooves for guiding each of the plurality of tire cords are formed at predetermined intervals;
A die plate that is attached to the tip of the rubber extruder and has an opening of a predetermined width;
A cylinder for filling rubber in the space between the baffle and the die plate;
The positions of the baffle and the die plate are adjusted so that the center in the width direction of the region where the baffle groove of the baffle is formed is different from the center in the width direction of the front edge of the die plate. An apparatus for producing corded rubber material characterized by the above.   The cord according to claim 5, wherein a distance from a center in a width direction of a region where the baffle groove of the baffle is formed to a center in the width direction of the front end of the die plate is 1 to 3 mm. Manufacturing equipment for rubber materials. A method for producing a corded rubber material for producing a corded rubber material by covering a plurality of tire cords arranged at predetermined intervals with rubber,
A corded rubber material in which an ear portion made of rubber is formed on any one of the side edges using the corded rubber material manufacturing apparatus according to any one of claims 1 to 6. A process for producing a corded rubber material, characterized in that   The length of the said ear | edge part in the width direction of the said corded rubber material is 1-3 mm, The manufacturing method of the corded rubber material of Claim 7 characterized by the above-mentioned. A corded rubber material in which a plurality of tire cords arranged at predetermined intervals are covered with rubber,
A corded rubber material characterized in that an ear portion made of rubber is formed on one of the side edges. The corded rubber material according to claim 9 is cut at a predetermined angle with respect to the tire cord, and a plurality of cut pieces in which an ear portion made of rubber is formed on one side edge portion,
A ply material is created by sequentially overlapping one side edge of the created plurality of cut pieces and the other side edge to be jointed,
A method for producing a pneumatic tire, comprising producing a pneumatic tire using the prepared ply material.

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