Baffle, and manufacturing device and method for cord-reinforced rubber member

Abstract

To provide a manufacturing technology for a corded rubber member that can manufacture the corded rubber member, by passing cords through a rubber extruder while arranging the cords in parallel at a predetermined end, even in a case of a high end.SOLUTION: A baffle, which has a plurality of cord insertion holes into which each of a plurality of cords can be inserted in parallel, is composed of an upper baffle and a lower baffle. A long through-hole for inserting the plurality of cords is formed on a coincident surface of the upper baffle and the lower baffle. A plurality of baffle grooves that guide the plurality of cords are formed at predetermined intervals on an undersurface of the upper baffle, which forms the long through-hole, and on a top surface of the lower baffle. Each baffle groove on the lower surface of the upper baffle and each baffle groove on the upper surface of the lower baffle are relative to each other, and the cord insertion hole is formed between the relative upper and lower baffle grooves.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a baffle, and an apparatus and method for manufacturing a cord-reinforced rubber member. [Background technology]

[0002] In the manufacture of pneumatic tires, cord-containing rubber members in which multiple cords are coated on both sides with rubber are used, such as carcass plies, breakers, etc. Cord-containing rubber members are generally manufactured by producing a long raw material by coating multiple parallel juxtaposed cords with rubber, cutting the raw material at a specified angle and length relative to the cords, and then joining both side edge portions in the width direction of the cut piece (for example, see Patent Documents 1 to 3).

[0003] The raw material is produced by continuously supplying multiple cords to a baffle, i.e., a die for arranging the cords in parallel, installed in a rubber extruder and arranging them in parallel, and then covering both sides of the multiple cords arranged in parallel with rubber extruded from the rubber extruder.

[0004] The baffle has a number of holes arranged in parallel in the longitudinal direction, which correspond to the shape and size of the cross section of the cords, and each cord is individually passed through the holes to align the cords in parallel.

[0005] As shown in Fig. 11, a baffle generally consists of two dies, an upper baffle 121 and a lower baffle 122. A plurality of baffle grooves 11 are formed at a predetermined interval on the mating surfaces of the two dies, and holes for passing a cord are formed along the mating surfaces by mating the upper baffle 121 and the lower baffle 122 (see, for example, Patent Document 1). Since the cross-sectional shape of a cord is generally circular, the baffle grooves have a semicircular cross-sectional shape on each of the mating surfaces of the upper baffle 121 and the lower baffle 122 so that holes with a circular cross-sectional shape are formed.

[0006] The diameter of the baffle groove is appropriately set according to the cord diameter, and the interval is appropriately set according to, for example, the ends, that is, the number of cords per 50 mm width. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2017-170622 A [Patent Document 2] JP 2018-12268 A [Patent Document 3] JP 2020-1861 A Summary of the Invention [Problem to be solved by the invention]

[0008] However, for high ends with large ends, the spacing between the holes must be made smaller, which creates problems such as the formation of baffle grooves exceeding the processing limits. For example, for a φ0.295 cord with 92 ends, the spacing between the baffle grooves is 0.04 mm, which exceeds the processing limits. For this reason, the conventional method of arranging multiple cords in parallel by passing each cord individually through the holes is difficult to apply to high ends.

[0009] Therefore, an object of the present invention is to provide a manufacturing technology for a rubber member with cords that can produce a rubber member with cords by arranging the cords in parallel at a predetermined ends and passing them through a rubber extruder, even in the case of high ends. [Means for solving the problem]

[0010] The present inventors have conducted extensive research into solving the above problems, and have found that the above problems can be solved by the invention described below, thereby completing the present invention.

[0011] The invention described in claim 1 is A baffle having a plurality of cord insertion holes into which a plurality of cords can be inserted in parallel, It is composed of an upper baffle and a lower baffle, A long through hole through which the cords are inserted is formed in a mating surface between the upper baffle and the lower baffle, The lower surface of the upper baffle forming the long through hole and the upper surface of the lower baffle are A plurality of baffle grooves for guiding the plurality of cords are provided on the lower surface of the upper baffle forming the long through hole and on the upper surface of the lower baffle. However, the groove pitch is equal to or larger than the baffle groove diameter. It is formed by The baffle is characterized in that each baffle groove on the lower surface of the upper baffle and each baffle groove on the upper surface of the lower baffle face each other, and the cord insertion hole is formed between the facing upper and lower baffle grooves.

[0012] The invention described in claim 2 is 2. The baffle according to claim 1, wherein the distance between two adjacent baffle grooves is 0.3 mm or less.

[0013] The invention described in claim 3 is 3. The baffle according to claim 1 or 2, wherein the baffle groove forms a circular arc.

[0014] The invention described in claim 4 is The baffle according to claim 3, characterized in that when a diameter of a virtual circle that constitutes the arc is D1 (mm) and a cord diameter of the cord is D2 (mm), D1 and D2 satisfy the following formula: (D2×1.08+0.18)×0.9≦D1≦(D2×1.08+0.18)×1.1

[0015] The invention described in claim 5 is 5. The baffle according to claim 1, wherein the baffle groove has a length of 5 to 30 mm.

[0016] The invention described in claim 6 is 1. An apparatus for manufacturing a cord-containing rubber member, the apparatus comprising: an apparatus for manufacturing a cord-containing rubber member in which a plurality of cords arranged in parallel at a predetermined interval are covered with rubber by passing the plurality of cords through a rubber extruder, the apparatus comprising: The reel stand is provided for pulling out the plurality of cords, and the rubber extruder is provided. Inside the rubber extruder, The baffle according to any one of claims 1 to 5. A die plate attached to the tip of the rubber extruder and having an opening of a predetermined width; a cylinder for filling a space formed between the baffle and the die plate with rubber, This manufacturing apparatus for a rubber member with cords is configured to manufacture the rubber member with cords by inserting each of the multiple cords along the multiple baffle grooves and passing the multiple cords through the rubber extruder while arranging them in parallel.

[0017] The invention described in claim 7 is A method for producing a cord-containing rubber member, in which a plurality of cords arranged in parallel at a predetermined interval are passed through a rubber extruder to produce a cord-containing rubber member in which the plurality of cords are covered with rubber, comprising the steps of: Using the apparatus for producing a cord-reinforced rubber member according to claim 6, This method for manufacturing a rubber member with cords is characterized in that the multiple cords are inserted along the multiple baffle grooves and passed through the rubber extruder while arranging the multiple cords in parallel, thereby manufacturing the rubber member with cords. Effect of the Invention

[0018] According to the present invention, a manufacturing technique for a rubber member with cords can be provided, which can produce a rubber member with cords by passing the rubber member through a rubber extruder while arranging the cords in parallel at a predetermined ends, even in the case of high ends. [Brief description of the drawings]

[0019] [Figure 1] 1 is a front view of a baffle according to an embodiment of the present invention, and a plan view of a lower baffle. FIG. [Diagram 2] FIG. 2 is a cross-sectional view showing an example of the configuration of a rubber member containing a cord. [Diagram 3] FIG. 11 is a cross-sectional view showing another example of the configuration of the cord-reinforced rubber member. [Figure 4] FIG. 2 is a front view of a through-hole forming portion of a baffle according to one embodiment of the present invention. [Diagram 5] 1 is a perspective view showing a schematic diagram of a manufacturing apparatus for a cord-reinforced rubber member according to an embodiment of the present invention; [Figure 6] FIG. 6 is a plan view showing a schematic cross-sectional structure of a main part of the rubber extruder shown in FIG. 5. [Figure 7] FIG. 6 is a side view that illustrates a cross-sectional structure of a main part of the rubber extruder in FIG. 5. [Figure 8] FIG. 6 is a front view of the die plate in FIG. 5. [Figure 9] FIG. 2 is a front view of a through-hole forming portion of a baffle according to one embodiment of the present invention. [Figure 10] FIG. 2 is a front view of a portion of a baffle where a through hole is formed in one embodiment of the present invention. [Figure 11] FIG. 1 is a front view of a conventional baffle. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] First, the importance of the cord arrangement in the cord-reinforced rubber member will be described.

[0021] In the case of cord-containing rubber components (hereinafter simply referred to as "rubber components") such as plies and breakers used in the manufacture of tires, the strength, rigidity, and other characteristics of the rubber components are directly linked to the quality of the tire, and since these characteristics are greatly influenced by the uniformity of the cord arrangement, the cord arrangement is strictly controlled.

[0022] Specifically, the proportion of the cord 2 per unit width (the area between the arrows) in the cross section of the rubber member 4 shown in Figure 2, i.e., the rivet area, is determined according to the ends, cord diameter, etc., and a rubber member in which there is a difference between multiple rivet areas, i.e., a rubber member 4 in which the cord is dense or coarse, is of inferior quality.

[0023] In addition, in the case of the high ends shown in Figure 3, in areas where the cords 2 are in contact with each other or where the spacing between the cords is too small, the rubber G does not flow between the cords during the vulcanization process, causing the cords 2 and the rubber G to separate.

[0024] In order to solve the above problems, the present inventors have conducted research from many perspectives, including the material of the baffle and the method of forming the baffle grooves.

[0025] However, as we were unable to find an appropriate solution, we realized that we needed to think outside the box.

[0026] Then, after a change of thinking and careful consideration, we decided not to follow the conventional concept of providing independent through holes for each cord and providing walls between each through hole, but to eliminate the walls and provide long through holes through which all the cords can pass, and to provide multiple baffle grooves above and below the long through holes to guide the cords. , with a groove pitch equal to or larger than the baffle groove diameter This led to the invention.

[0027] The manufacturing apparatus and manufacturing method for the baffle and the cord-reinforced rubber member will be described below in order.

[0028] 1. Baffle (1) Features The baffle of this embodiment is a baffle used in a corded rubber member manufacturing apparatus that produces a corded rubber member in which multiple cords are covered with rubber by passing multiple cords arranged at predetermined intervals through a rubber extruder, and is composed of an upper baffle and a lower baffle, and has multiple cord insertion holes into which each of the multiple cords can be inserted in parallel.

[0029] A long through hole for inserting a plurality of cords is formed on the mating surface between the upper baffle and the lower baffle, and a plurality of baffle grooves for guiding the plurality of cords are formed on the lower surface of the upper baffle where the long through hole is formed and on the upper surface of the lower baffle. , with a groove pitch equal to or larger than the baffle groove diameter They are formed at predetermined intervals.

[0030] The baffle grooves on the lower surface of the upper baffle and the baffle grooves on the upper surface of the lower baffle face each other, and cord insertion holes are formed between the facing upper and lower baffle grooves.

[0031] The following is a specific explanation with reference to the drawings.

[0032] Fig. 1(a) is a front view of the baffle according to the present embodiment, and Fig. 1(b) is a plan view of an upper baffle constituting the baffle according to the present embodiment. Baffle 12 is constructed by overlapping two dies, an upper baffle 121 and a lower baffle 122, and a long through hole 123 is formed between the two dies.

[0033] A plurality of baffle grooves 126, 127 for guiding a plurality of cords are formed on a lower surface 124 of the upper baffle 121 forming the long through hole 123 and on an upper surface 125 of the lower baffle 122. , Groove pitch equal to or larger than the baffle groove diameter In Fig. 1, d is the distance between adjacent baffle grooves (hereinafter also referred to as "groove interval"), and L is the length of the groove.

[0034] Comparing baffle 12 of the present embodiment with a conventional baffle, conventional baffle 12 shown in FIG. 11 has multiple through holes 111 for inserting cords therethrough that are independent of each other, and the baffle grooves 11 constituting each through hole are separated from the baffle grooves 11 constituting the adjacent through holes by the wall of the mold.

[0035] In contrast, in the case of the baffle of this embodiment, as shown in FIG. 1, one long through hole 123 is formed between the upper and lower dies (upper baffle and lower baffle), and a number of baffle grooves 126, 127 for guiding a number of cords are formed above and below the long through hole 123. Since there is only one through hole, it differs in that there are no walls separating the individual through holes as in conventional baffles.

[0036] Furthermore, in the case of the baffle of this embodiment, even in the case of high ends, which has previously been considered difficult to form baffle grooves due to limitations in processing technology, the difficulty of forming baffle grooves can be avoided because there are no walls separating each through hole, and further, there is no problem of separation of the cords and rubber occurring when the rubber G does not flow between the cords during the vulcanization process described above.

[0037] In this way, according to the present invention, it is possible to provide a manufacturing technique for cord-reinforced rubber components that does not encounter problems such as limitations in the processing technique for forming baffle grooves or the problem of inducing separation of the cord and rubber, even in the case of high ends.

[0038] (2) Preferred embodiment Next, a preferred embodiment of the baffle will be described. Fig. 4 is a front view of a through-hole forming portion of a baffle according to an embodiment of the present invention. In Fig. 4, the circle indicated by the dashed line indicates a cross section of a cord, D1 is the cord diameter, and D2 is the baffle groove diameter, i.e., the diameter of an imaginary circle forming an arc forming the groove bottom of the baffle. Also, d is the groove interval, h is the distance between the lower surface 124 of the upper baffle 121 and the upper surface 125 of the lower baffle 122, i.e., the upper and lower surface interval, and P is the distance between the centers of adjacent baffle grooves in the width direction, i.e., the groove pitch.

[0039] In the baffle of this embodiment, when the groove spacing d between baffle grooves 126 and 127 is 0.3 mm or less, the effect of the present invention is remarkable.

[0040] When the groove spacing d exceeds 0.3 mm, the problem of the processing limit in forming the baffle groove due to the high ends and the problem of the cord and rubber being separated are unlikely to occur, so that the conventional technology can be used in many cases. On the other hand, when the groove spacing d is 0.3 mm or less, the conventional technology causes the problems of the high ends and the cord and rubber being separated, but in the present invention, as described above, these problems do not occur, so the effects of the present invention are significantly exhibited.

[0041] The rubber cords used in tire manufacturing are generally made of a single wire with a circular cross section, or a twisted wire that is inscribed in a circle when viewed in the longitudinal direction (for example, "1x3," "2+2," "1+6," etc.). In such cases, by making the bottom of the baffle groove into an arc shape, it is possible to more reliably guide the cord along the baffle groove while suppressing wear of the cord caused by friction with the through-hole when the cord is inserted.

[0042] In addition, when the diameter of an imaginary circle constituting the arc of the baffle groove is D1 (mm) and the cord diameter is D2 (mm), it is preferable that D1 and D2 satisfy the following formula. (D2×1.08+0.18)×0.9≦D1≦(D2×1.08+0.18)×1.1

[0043] As a result of the inventor's research, it was found that by setting the magnitudes of D1 and D2 so as to satisfy the above relationship, it is possible to effectively reduce friction between the baffle groove and the cord, and also to more effectively suppress vibration of the cord in the width direction of the through hole.

[0044] In the case of a stranded wire, the "cord diameter" referred to here means the maximum across length of the cord when viewed in the longitudinal direction.

[0045] Moreover, it is preferable that the surface interval h between the top and bottom of the through hole is smaller than the cord diameter D1.

[0046] In this embodiment, the baffle grooves are recessed on the lower surface of the upper baffle and the upper surface of the lower baffle, so that the vertical spacing h is smaller than the baffle groove diameter D2, but by making the vertical spacing h even smaller than the cord diameter D1, the baffle grooves can further enhance the cord restraint function in the width and up and down directions. This suppresses the cord's vibration in the width direction and also in the up and down directions, allowing the cord to be arranged in a predetermined position with greater accuracy.

[0047] The length L of the baffle groove (see FIG. 1(b)) is preferably 5 to 30 mm, and more preferably 10 to 15 mm.

[0048] The length L of the baffle groove may be shorter than the conventional length. In the case of the baffle of this embodiment, even if the length of the baffle groove is shortened as described above, the cords can be arranged with high dimensional accuracy. Furthermore, by shortening the length of the baffle groove, the distance that the cords swing in the baffle groove is shortened, so that wear of the cords can be reduced.

[0049] The width of the baffle groove depends on the design value of the ends, and can be designed to be as close to 0 as possible.

[0050] 2. Manufacturing equipment for rubber components with cords Next, a manufacturing apparatus for a rubber member containing a cord (hereinafter, simply referred to as a "manufacturing apparatus for a rubber member") will be described. Fig. 5 is a perspective view that shows a manufacturing apparatus for a rubber member according to an embodiment of the present invention. Fig. 6 is a plan view that shows a cross-sectional structure of a main part of the rubber extruder in Fig. 5, Fig. 7 is a side view that shows a cross-sectional structure of a main part of the rubber extruder, and Fig. 8 is a front view of a die plate.

[0051] As shown in Fig. 5, the rubber member manufacturing apparatus 1 includes a reel stand 8, a plurality of reels 9, a rubber extruder 5, and a cylinder 5A, and a baffle 12 is provided inside the rubber extruder 5 as shown in Figs. 6 and 7. The plurality of reels 9 are suspended from the reel stand 8. The cord 2 is wound around the reel 9, and is pulled out from the reel 9 and supplied to the rubber extruder 5 during the manufacture of the rubber member.

[0052] In the baffle 12 of this embodiment, as described above, a plurality of baffle grooves are formed at predetermined intervals in the width direction, and the cord 2 sent from the reel stand 8 is guided to the desired position by passing it through each baffle groove, and the multiple cords are arranged in parallel.

[0053] The die plate 6 is a plate-like member attached to the tip of the rubber extruder 5, and as shown in FIG. 8, an opening 13 is formed in the center of the die plate 6 for extrusion molding the rubber member 4 in a predetermined shape and dimensions.

[0054] 7, the rubber extruder 5 is provided with an internal space 5A1, and the cylinder 5A supplies rubber G to the internal space 5A1 of the rubber extruder 5, thereby filling the space between the die plate 6 and the baffle 12 with the rubber G. In this state, the parallel cord bodies arranged in parallel are sent out from the baffle 12 toward the opening 13 of the die plate 6, whereby the rubber member 4 in which the parallel cord bodies are covered with rubber G is extruded.

[0055] Furthermore, by using the baffle 12 according to this embodiment in the above-mentioned rubber member manufacturing apparatus, it is possible to easily manufacture high-end rubber members, which has previously been difficult to manufacture, without the problem of inducing separation of the cord and rubber.

[0056] In this way, the manufacturing method of this embodiment is a method of producing a rubber member with cords by inserting multiple cords along multiple baffle grooves and passing the multiple cords in parallel arrangement through a rubber extruder, and can be adapted to use any type of cord, including a single-wire cord, a stranded cord in which multiple cords are twisted together, or a composite stranded cord in which multiple cords are twisted around the outside of a core cord made of a single wire or multiple cords twisted together. EXAMPLES

[0057] The present invention will be described in more detail below with reference to examples. In the following, rubber members were produced using a high-end rubber, which has been difficult to produce using conventional techniques.

[0058] 1. Example 1 In this example, a baffle according to the present embodiment was used as the baffle, that is, a baffle having a through hole as shown in FIG. 9(a), with a baffle groove length of 4 mm, a baffle groove diameter D2 of φ0.4 mm, a baffle groove pitch P of 0.54 mm, a groove spacing d of 0.3 mm, and a surface spacing h between the upper baffle and the lower baffle of 0.32 mm. A rubber member was manufactured using a solid cord with a cord diameter (D1) of φ0.3 mm, with a total gauge of 0.73 mm and ends of 92 ends.

[0059] The rubber member obtained did not induce separation of the cord and rubber even in the subsequent vulcanization process, and it was confirmed that by applying the present invention, rubber members of stable quality can be manufactured without any deterioration in quality, even for high ends.

[0060] 2. Example 2 In this example, a baffle according to the present embodiment was used as the baffle, that is, a baffle having a through hole as shown in FIG. 9(b), with a baffle groove pitch P of 0.54 mm, a groove spacing d of 0.2 mm, and a surface spacing h between the upper baffle and the lower baffle of 0.21 mm. A rubber member having a total gauge of 0.73 mm and ends of 92 was manufactured using a solid cord with a cord diameter (D1) of φ0.3 mm.

[0061] Even though the rubber member obtained had an extremely high end of 92, separation of the cord and the rubber did not occur even in the subsequent vulcanization process. This example also confirmed that by applying the present invention, it is possible to manufacture rubber members of stable quality even with high ends without incurring a decrease in quality.

[0062] 3. Example 3 In this example, a rubber member was manufactured in the same manner as in Example 1, except that a baffle was used in which the groove spacing d shown in Figure 10(a) was 0.54 mm, the baffle groove diameter D2 was φ0.5 mm, and the surface spacing h between the upper baffle and the lower baffle was 0.44 mm, which was larger than that in Example 1.

[0063] In this embodiment as well, the rubber member obtained does not induce separation of the cord and rubber in the subsequent vulcanization process, and it was confirmed that by applying the present invention, high-end rubber members can be manufactured with stable quality, even when the surface spacing h between the upper baffle and the lower baffle is set large.

[0064] 4. Example 4 In this example, the rubber member was manufactured in the same manner as in Example 2, except that a baffle was used in which the groove spacing d shown in Figure 10(b) was 0.54 mm, the baffle groove diameter D2 was φ0.5 mm, and the surface spacing h between the upper baffle and the lower baffle was 0.37 mm, i.e., the surface spacing h was set to be larger than the cord diameter D1 (0.3 mm).

[0065] In this embodiment as well, it was confirmed that the obtained rubber member did not induce separation of the cord and rubber in the subsequent vulcanization process, and that by applying the present invention, it was possible to manufacture a rubber member with an extremely high end of 92 with stable quality, even when the surface spacing h between the upper baffle and the lower baffle was set to be larger than the cord diameter D1.

[0066] Although the present invention has been described above based on the embodiment, the present invention is not limited to the above embodiment. Various modifications can be made to the above embodiment within the same and equivalent scope of the present invention. [Explanation of symbols]

[0067] 1. Cord-reinforced rubber component manufacturing equipment 2 Code 4. Rubber material with cord 5. Rubber Extruder 5A Cylinder 5A1 Internal space 6 Die Plate 8 Reel Stand 9 Reels 11, 126, 127 Baffle groove 12 Baffle 111, 123 Through holes 121 Upper baffle 122 Lower baffle 124 Underside of upper baffle 125 Top of lower baffle 13 Frontage D1 cord diameter D2 baffle groove diameter d Groove Spacing G Rubber h Top and bottom surface spacing L Baffle groove length P Groove pitch

Claims

1. A baffle having a plurality of cord insertion holes into which a plurality of cords can be inserted in parallel, It is composed of an upper baffle and a lower baffle, A long through hole through which the cords are inserted is formed in a mating surface between the upper baffle and the lower baffle, a plurality of baffle grooves for guiding the plurality of cords are formed on a lower surface of the upper baffle forming the long through hole and on an upper surface of the lower baffle at a groove pitch equal to or greater than a baffle groove diameter, The baffle is characterized in that each baffle groove on the lower surface of the upper baffle and each baffle groove on the upper surface of the lower baffle face each other, and the cord insertion hole is formed between the facing upper and lower baffle grooves.

2. 2. The baffle according to claim 1, wherein the distance between two adjacent baffle grooves is 0.3 mm or less.

3. 3. The baffle according to claim 1 or 2, wherein the baffle groove forms a circular arc.

4. The diameter of the imaginary circle that constitutes the arc is D. １ (mm), and the cord diameter of the cord is D ２ (mm), D １ and D. ２ 4. The baffle according to claim 3, wherein the following formula is satisfied: (D ２ ×1.08+0.18)×0.9≦D １ ≦(D ２ ×1.08+0.18)×1.1

5. 5. The baffle according to claim 1, wherein the baffle groove has a length of 5 to 30 mm.

6. 1. An apparatus for manufacturing a cord-containing rubber member, the apparatus comprising: an apparatus for manufacturing a cord-containing rubber member in which a plurality of cords arranged in parallel at a predetermined interval are covered with rubber by passing the plurality of cords through a rubber extruder, the apparatus comprising: The reel stand is provided for pulling out the plurality of cords, and the rubber extruder is provided. Inside the rubber extruder, A baffle according to any one of claims 1 to 5. A die plate attached to a tip of the rubber extruder and having an opening of a predetermined width; a cylinder for filling a space formed between the baffle and the die plate with rubber, The apparatus for manufacturing a rubber member with cords is configured to manufacture the rubber member with cords by inserting each of the multiple cords along the multiple baffle grooves and passing the multiple cords through the rubber extruder while arranging them in parallel.

7. A method for producing a cord-containing rubber member, in which a plurality of cords arranged in parallel at a predetermined interval are passed through a rubber extruder to produce a cord-containing rubber member in which the plurality of cords are covered with rubber, comprising the steps of: Using the apparatus for manufacturing a cord-reinforced rubber member according to claim 6, A method for manufacturing a rubber member with cords, comprising: inserting each of the plurality of cords along the plurality of baffle grooves and passing the plurality of cords in parallel arrangement through the rubber extruder to manufacture the rubber member with cords.

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