JP2020066166A - Composite rubber member manufacturing method - Google Patents

Abstract

To provide a manufacturing method capable of accurately forming a composite rubber member in which a first rubber region is covered with a second belt-like rubber member so as to prevent a surface of the first rubber region (color rubber) from being exposed while suppressing an amount of protrusion of the second belt-like rubber member from a side edge of the first rubber region (color rubber) in a width direction.SOLUTION: A composite rubber member manufacturing method includes an attaching step S2, and first and second measurement steps S3 and S4. In the attaching step S2, a second rubber region 12 is attached to a surface of a first belt-like rubber member 11 conveyed in a length direction. In the first measurement step S3, a shape profile of the first belt-like rubber member 11 in a width direction is measured using a distance sensor 35 during transportation. In the second measurement step S4, a position of a side edge of a first rubber region is measured using an image capturing device 36 during transportation. In the attaching step S2, an attaching position of the second belt-like rubber member 12 is controlled in a width direction based on respective measurement data obtained in the first and second measuring steps S3 and S4.SELECTED DRAWING: Figure 3

Description

  According to the present invention, a second band-shaped rubber member made of black rubber is attached to a first band-shaped rubber member having a first rubber region made of colored rubber in a cross section in the width direction, and the first rubber region is made a second band-shaped rubber member. The present invention relates to a composite rubber member manufacturing method capable of accurately forming a composite rubber member coated with a member.

  In order to enhance the decorativeness of the tire, a tire having a raised mark having a white colored rubber on the surface of a black sidewall portion is used (for example, see Patent Document 1 below). .

  To form such a tire, as shown in FIG. 5, a composite rubber member c in which a second belt-shaped rubber member b is attached to the surface of the first belt-shaped rubber member a is used for forming the sidewall portion. Used as a side rubber.

  The first strip-shaped rubber member a is an extruded product extruded from a multi-layer extrusion device, and its cross section in the width direction has a first rubber region a1 made of colored rubber and a second rubber region a2 made of black rubber. It is divided into a plurality of areas including. Generally, the second rubber region a2 includes a region a2a of sidewall rubber having excellent cut resistance and a region a2b of clinch rubber for preventing rim displacement having excellent wear resistance. The second band-shaped rubber member b is made of black rubber having excellent weather resistance and is formed into a thin tape shape by rolling and molding with a thickness of about 0.5 to 1.0 mm.

  Then, the second belt-shaped rubber member b is attached onto the first belt-shaped rubber member a conveyed in the length direction by the conveyor, and the surface of the first rubber region a1 (colored rubber) is covered.

  At this time, prior to sticking, the sticking position of the second belt-shaped rubber member b in the width direction is adjusted based on the operator's visual observation. Specifically, with the position P1 of the side edge of the first rubber region a1 (color rubber) in the width direction as a reference, the second belt-shaped rubber member b protrudes from the position P1 to the clinch rubber region a2b side, The attachment position of the second belt-shaped rubber member b is adjusted.

  However, the first strip-shaped rubber member a meanders in the width direction during conveyance. Therefore, there is a problem in that the attachment position is displaced from that at the time of adjustment, and a part of the surface of the first rubber region a1 (colored rubber) is exposed.

  At the time of adjustment, it is possible to secure a large amount of protrusion ΔL of the second belt-shaped rubber member b from the position P1 in advance. However, when the second belt-shaped rubber member b overlaps the area a2b beyond the boundary position P2 between the area a2a and the area a2b, a rim shift occurs at this overlapping portion, which adversely affects the internal pressure retention of the tire. give. Moreover, since the area portions a2a and a2b are both black, it is difficult to visually determine the boundary position P2, and thus it is difficult to secure a large amount of protrusion ΔL.

JP 04-275136A

  INDUSTRIAL APPLICABILITY The present invention can suppress the surface of the first rubber region (colored rubber) from being exposed while suppressing the amount of the second strip-shaped rubber member protruding from the side edge of the first rubber region in the width direction to be low. An object of the present invention is to provide a composite rubber member manufacturing method capable of accurately forming a composite rubber member in which a region is covered with a second belt-shaped rubber member.

According to the present invention, a surface of a first belt-shaped rubber member in which a cross section in a width direction perpendicular to a length direction is divided into a region including a first rubber region made of colored rubber and a second rubber region made of black rubber To
A method of manufacturing a composite rubber member, comprising: adhering a second belt-shaped rubber member made of black rubber to form a composite rubber member in which the surface of the first rubber region is covered with the second belt-shaped rubber member.
A conveying step of conveying the first belt-shaped rubber member in the length direction,
A sticking step of sticking the second rubber region on the surface of the first belt-shaped rubber member by a sticking device during the carrying step;
A first measurement step of measuring the contour shape in the width direction on the surface of the first belt-shaped rubber member during the conveyance step, using a distance sensor;
A second measuring step of measuring a position of a side edge in the width direction of the first rubber region on the surface of the first belt-shaped rubber member during the carrying step, using a second photographing step,
In the pasting step, the pasting position of the second strip-shaped rubber member is controlled in the width direction based on the measurement data obtained in the first measurement step and the measurement data obtained in the second measurement step.

  In the method for manufacturing a composite rubber member according to the present invention, the first belt-shaped rubber member includes a convex or concave mark continuously extending in a length direction on a surface of the second rubber region, In the measuring step, it is preferable to measure the position of the mark.

  In the composite rubber member manufacturing method according to the present invention, it is preferable that the mark has a height or depth from the surface of the second rubber region of 0.5 to 1.5 mm.

  In the composite rubber member manufacturing method according to the present invention, it is preferable that the first belt-shaped rubber member is an extruded product extruded from a multi-layer extruding device.

  In the composite rubber member manufacturing method according to the present invention, it is preferable that the multi-layer extrusion device includes a concave portion or a convex portion for forming the mark on the wall surface of the extrusion port of the die plate.

  In the composite rubber member manufacturing method according to the present invention, in the attaching step, the side edge of the second belt-shaped rubber member is positioned between the mark and the side edge of the first rubber region, The applicator is preferably controlled in the width direction.

In the composite rubber member manufacturing method according to the present invention, the composite rubber member is a side rubber of a tire,
The second rubber region includes a clinch rubber region portion and a sidewall rubber region portion, and the mark is preferably formed at a boundary position between the clinch rubber region portion and the sidewall rubber region portion.

  As described above, the present invention includes a first measurement process using a distance sensor and a second measurement process using an image capturing device, and the measurement data obtained by the first measurement process and the second measurement process. The attachment position of the second belt-shaped rubber member is controlled in the width direction on the basis of the measurement data obtained by.

  Therefore, even when the first belt-shaped rubber member meanders during conveyance, the first belt-shaped rubber member is suppressed from protruding from the side edge of the first rubber region (colored rubber) in the width direction while keeping the first belt-shaped rubber member at a low level. It is possible to prevent the surface of the rubber region (colored rubber) from being exposed.

It is sectional drawing which shows the tire formed using the composite rubber member manufactured by the composite rubber member manufacturing method of this invention. (A) is a perspective view which shows one Embodiment of a composite rubber member, (b) is the partial cross section figure. It is a side view which shows notionally a composite rubber member manufacturing method. It is the partial front view which looked at the extrusion opening in the die plate of a multilayer extrusion device from the extrusion direction downstream. FIG. 9 is a cross-sectional view in the width direction of a composite rubber member for explaining conventional problems.

  Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a cross-sectional view showing a tire 1 formed using a composite rubber member 10 manufactured by the composite rubber member manufacturing method of the present invention (hereinafter simply referred to as “manufacturing method”).

  As shown in FIG. 1, the tire 1 of the present embodiment is a pneumatic tire and has a carcass 6 extending from the tread portion 2 to the sidewall portion 3 to the bead core 5 of the bead portion 4. Further, on the surface of the side wall portion 3, a raised mark 8 made of colored rubber G1 is provided in a protruding manner.

  The carcass 6 is formed of at least one carcass ply 6A having a carcass cord, in this example, one carcass ply 6A. The carcass ply 6 </ b> A has ply folded portions 6 b that are folded around the bead core 5 from the inner side to the outer side in the tire axial direction at both ends of the toroidal ply body 6 a that straddles between the bead cores 5 and 5.

  The outer side surface of the tire 1 is formed by the side rubber 9 arranged on the outer side of the carcass 6 in the tire axial direction.

  FIG. 2A shows the side rubber 9 before forming the raw tire. The side rubber 9 is formed as a composite rubber member 10 in which the second belt-shaped rubber member 12 is attached to the surface of the first belt-shaped rubber member 11.

  The cross section of the first strip-shaped rubber member 11 in the width direction perpendicular to the length direction has a plurality of regions including a first rubber region Y1 made of colored rubber G1 and a second rubber region Y2 made of black rubber G2. It is divided. The first rubber region Y1 is arranged at the embossed mark formation position. In this example, the second rubber region Y2 may be further divided into a region Y2a of the sidewall rubber G2a having excellent cut resistance and a region Y2b of the clinch rubber G2b for preventing rim displacement having excellent wear resistance. Shown.

  As shown in FIG. 2B, the first band-shaped rubber member 11 has a convex or concave mark 15 continuously extending in the length direction on the surface of the second rubber region Y2. In this example, the case where the mark 15 is a convex protrusion is shown. The mark 15 is arranged closer to the region Y2b than the position P1 of the side edge of the first rubber region Y1 in the width direction. In particular, the mark 15 is preferably arranged at the boundary position P2 between the area portion Y2a and the area portion Y2b. Arranged at the boundary position P2 means that at least a part of the mark 15 is located at the boundary position P2. In this way, when the mark 15 is arranged at the boundary position P2, it becomes a mark at the boundary position P2, and it is visually inspected whether or not the second belt-shaped rubber member 12 overlaps the area portion Y2b beyond the boundary position P2. It can be easily judged.

  The height or depth (height h in this example) of the mark 15 from the surface of the second rubber region Y2 is preferably in the range of 0.5 to 1.5 mm. In this example, the mark 15 has a triangular cross section, but various cross sectional shapes such as a rectangular cross section can be adopted. If the height h is less than 0.5 mm, the function as a mark becomes insufficient. On the other hand, when it exceeds 1.5 mm, the mark 15 is easily deformed, and the position accuracy tends to be deteriorated.

  The first strip-shaped rubber member 11 as described above can be easily formed by extrusion molding using the multilayer extrusion device 19 as in the conventional case.

  As shown in FIG. 3, in this example, the multilayer extrusion device 19 includes three rubber extruders 20, a head 21 to which the front end of each rubber extruder 20 is attached, and a front end of the head 21. And the die plate 22. The head 21 is provided with a rubber flow path (not shown) that merges the rubber (color rubber G1, sidewall rubber G2a, clinch rubber G2b) from each rubber extruder 20 into one and guides them to the die plate 22. . The die plate 22 is provided with an extrusion port 23 (shown in FIG. 4) for molding the merged rubber into a final cross-sectional shape and extruding it as the first belt-shaped rubber member 11.

  As shown in FIG. 4, in this example, in order to form the mark 15, a recess 24 for forming the mark is formed on the wall surface 23S of the extrusion port 23. The mark 15 may be, for example, a concave groove, and in this case, the wall surface 23S is provided with a convex portion for mark formation.

  Further, as shown in FIG. 2A, the second belt-shaped rubber member 12 is made of black rubber G3 and is formed into a thin tape shape by rolling and molding with a thickness of about 0.5 to 1.0 mm. In this example, as the black rubber G3, for example, butyl rubber having excellent weather resistance is used. The second strip-shaped rubber member 12 covers the entire surface of the first rubber region Y1.

  As shown in FIG. 3, the method for manufacturing the composite rubber member 10 includes a carrying step S1, a sticking step S2, a first measuring step S3, and a second measuring step S4.

  In the carrying step S1, the conveyor 25 is used to carry the first strip-shaped rubber member 11 extruded from the multilayer extrusion device 19 in the length direction.

  In the attaching step S2, the second belt-shaped rubber member 12 is attached to the surface of the first belt-shaped rubber member 11 by using the attaching device 30 during the carrying step S1.

  The pasting device 30 includes a stand portion 31 and a guide portion 32 in this example. The stand portion 31 rotatably holds the roll-shaped body 12A in which the second band-shaped rubber member 12 formed in advance is wound around a reel. The guide portion 32 includes a guide roller and guides the second strip rubber member 12 unwound from the roll-shaped body 12A to the surface of the first strip rubber member 11.

  The pasting device 30 also includes moving means (not shown) for moving the pasting device 30 in the width direction. The moving means includes, for example, a ball screw mechanism, and the moving distance of the pasting device 30 in the width direction can be freely adjusted by controlling the rotating direction and the number of rotations of the ball screw shaft.

  Reference numeral 33 is a pressure roller that presses the second belt-shaped rubber member 12 guided by the guide portion 32 against the first belt-shaped rubber member 11. In this example, the pressure bonding roller 33 is not included in the pasting device 30 and does not move in the width direction.

  In the first measurement step S3, prior to the pasting step S2, the contour shape in the width direction on the surface of the first strip-shaped rubber member 11 is measured using the distance sensor 35 during the transportation step S1. Specifically, the distance sensor 35 scans the surface of the second rubber region Y2 in the width direction to measure the contour shape thereof.

  Thereby, for example, by comparing with the contour shape at the reference position stored in advance, it is possible to measure the position in the width direction of the first strip-shaped rubber member 11 from the reference position, the position deviation amount, and the like. In this example, the mark 15 in the contour shape is detected, and the position of the mark 15 in the width direction from the reference position is measured, for example.

  As the distance sensor 35, for example, a non-contact type displacement sensor such as a laser displacement sensor can be preferably adopted. In particular, the two-dimensional laser displacement sensor is preferable in that the movement of the distance sensor 35 for scanning is unnecessary.

  In the second measurement step S4, prior to the sticking step S2, the position P1 (shown in FIGS. 2A and 2B) of the widthwise side edge of the first rubber region Y1 is imaged during the conveyance step S1. The measurement is performed using the camera 36. By performing image processing on the captured image, it is possible to detect the position P1 of the side edge of the first rubber region Y1 due to the difference in brightness and the like. As a result, the position of this position P1 in the width direction can be obtained from the reference position. As the image capturing device 36, various cameras such as a CCD camera can be adopted.

  The first measurement step S3 can be performed before, after, or simultaneously with the second measurement step S4.

  Then, in the attaching step S2, the measurement data obtained in the first measurement step S3 (in this example, the data of the position of the mark 15 in the width direction) and the measurement data obtained in the second measurement step S4 (the first rubber in this example). The pasting device 30 is controlled in the width direction based on the data of the position P1 of the side edge of the region Y1, and the pasting position of the second belt-shaped rubber member 12 is controlled in the width direction.

  Specifically, as shown in FIG. 2B, the side edge 12E of the second belt-shaped rubber member 12 is located between the mark 15 and the side edge position P1 of the first rubber region Y1. Thus, the pasting device 30 is controlled in the width direction. As a result, even when the first belt-shaped rubber member 11 meanders during conveyance, the amount of protrusion of the second belt-shaped rubber member 12 from the position P1 is kept low, and the surface of the first rubber region Y1 (color rubber) is suppressed. Can be prevented from being exposed

  In this example, the manufacturing method includes a step of winding the formed composite rubber member 10 in a roll shape, and the composite rubber member 10 is stored and put in the raw tire forming step in a roll state.

  Above, a particularly preferred embodiment of the present invention has been described in detail, but the present invention is not limited to the illustrated embodiment and can be carried out by being modified into various aspects.

  Using the manufacturing method according to the present invention, the composite rubber member shown in FIG. 2 (a) was continuously formed with a length of 1000 m. Using the composite rubber member, 500 pneumatic tires shown in FIG. 1 were each vulcanized and molded. Then, the number of tires in which the following defects A and B were generated was measured.

  The defect A is a defect of the tire caused by the exposed part of the colored rubber in the composite rubber member. The defect B is a defect of the tire due to the second strip-shaped rubber member overlapping the region portion Y2b of the clinch rubber in the composite rubber member.

  The first strip-shaped rubber member is an extruded product, and a mark is formed at the boundary position between the clinch rubber region and the sidewall rubber region according to the specifications of Table 1. Except for those described in Table 1, the configurations are substantially the same. The distance in the width direction between the position P1 of the side edge of the first rubber region Y1 and the mark is 7.0 mm. As a distance sensor, AE1000 / photo head PH22 manufactured by Nireco Co., Ltd. was used. As the image capturing device, CV-035M manufactured by Keyence Corporation was used.

  As shown in the table, it can be confirmed that the occurrence of the defects A and B is suppressed in the examples.

9 Side rubber 10 Composite rubber member 11 1st strip | belt-shaped rubber member 12 2nd strip | belt-shaped rubber member 12E Side edge 15 Mark 19 Multilayer extrusion device 22 Die plate 23 Extrusion port 23S Wall surface 24 Recess 30 Adhesive device 35 Distance sensor 36 Image pick-up machine G1 Colored rubber G2, G3 Black rubber G2b Clinch rubber G2a Side wall rubber P1 Side edge position P2 Boundary position S1 Conveying step S2 Pasting step S3 First measuring step S4 Second measuring step Y1 First rubber area Y2 Second rubber area Y2a , Y2b area part

Claims (7)

A cross section in the width direction perpendicular to the length direction is divided into a region including a first rubber region made of colored rubber and a second rubber region made of black rubber on the surface of the first belt-shaped rubber member,
A method of manufacturing a composite rubber member, comprising: adhering a second belt-shaped rubber member made of black rubber to form a composite rubber member in which the surface of the first rubber region is covered with the second belt-shaped rubber member.
A conveying step of conveying the first belt-shaped rubber member in the length direction,
A sticking step of sticking the second rubber region on the surface of the first belt-shaped rubber member by a sticking device during the carrying step;
A first measuring step of measuring a contour shape in a width direction on a surface of the first belt-shaped rubber member during the carrying step, using a distance sensor;
A second measuring step of measuring a position of a side edge in the width direction of the first rubber region on the surface of the first belt-shaped rubber member during the carrying step by using an image capturing device,
In the pasting step, the pasting position of the second belt-shaped rubber member is controlled in the width direction based on the measurement data obtained in the first measurement step and the measurement data obtained in the second measurement step.
Composite rubber member manufacturing method. The first strip-shaped rubber member has a convex or concave mark continuously extending in the length direction on the surface of the second rubber region, and the first measuring step measures the position of the mark. ,
The method for manufacturing a composite rubber member according to claim 1. The mark has a height or depth from the surface of the second rubber region of 0.5 to 1.5 mm.
The method for manufacturing a composite rubber member according to claim 2. The first strip-shaped rubber member is an extruded product extruded from a multilayer extrusion device,
The method for producing a composite rubber member according to claim 1. The multi-layer extrusion device is provided with a concave portion or a convex portion for forming the mark on the wall surface of the extrusion port of the die plate,
The method for manufacturing a composite rubber member according to claim 4. In the pasting step, the pasting device is controlled in the width direction so that the side edge of the second belt-shaped rubber member is located between the mark and the side edge of the first rubber region.
The method for manufacturing a composite rubber member according to claim 2. The composite rubber member is a side rubber of a tire,
The second rubber region includes a clinch rubber region and a sidewall rubber region, and the mark is formed at a boundary position between the clinch rubber region and the sidewall rubber region.
The composite rubber member manufacturing method according to claim 2.

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