JP6480684B2 - Rubber member and composite of rubber member and sheet - Google Patents

Description

  The present invention relates to a rubber member used for forming a green tire, and a composite of a rubber member and a sheet.

  In order to form a green tire, various unvulcanized rubber members such as tread rubber and sidewall rubber are used. For example, the sidewall rubber is continuously extruded with a constant cross-sectional shape by a rubber extrusion device, wound around a reel, and stored as a rubber winder. When the green tire is molded, the sidewall rubber is fed from a rubber winder, cut into a predetermined length, and wound around a tire molding drum or the like.

  For example, Patent Document 1 below proposes a method of winding a rubber member around a reel while attaching a film-like sheet made of resin on one surface of the rubber member. Such a sheet can prevent adhesion between the rubber members during storage.

JP 2007-331863 A

  The rubber member in which the sheet is attached and stored needs to be peeled off when the raw tire is manufactured. However, the conventional one has a large adhesive force between the rubber member and the sheet, and has a problem such that the rubber member is partially broken when the sheet is peeled off.

  The present invention has been devised in view of the actual situation as described above, and enables the prevention of adhesion between rubber members when a sheet is added, and the rubber member capable of easily peeling the sheet, and the rubber member The main purpose is to provide a composite of sheet and sheet.

  The present invention is an unvulcanized and band-shaped rubber member used for molding a raw tire, and the rubber member is a sheet affixing sheet on which a sheet for preventing adhesion between rubber members is affixed during storage In a cross section having a surface and perpendicular to the longitudinal direction of the rubber member, the sheet pasting surface is a first surface that contacts the sheet, and a second surface that does not contact the sheet by being recessed from the first surface It is characterized by containing alternately.

  In the rubber member according to the aspect of the invention, it is preferable that the first surface and the second surface continuously extend along the longitudinal direction.

  In the cross section of the rubber member of the present invention, it is desirable that the sheet sticking planned surface has a rectangular or trapezoidal outline.

  In the cross section of the rubber member of the present invention, the width W1 of the first surface and the width W2 of the second surface are preferably 2 to 3 mm.

  In the cross section of the rubber member of the present invention, it is desirable that the second surface is recessed by 1 to 2 mm from the first surface.

  According to a second aspect of the present invention, a sheet is releasably attached to the sheet sticking planned surface of the rubber member described in any one of the above, and the sheet contacts the first surface while the second It is a composite of a rubber member and a sheet characterized by being separated from the surface.

  The rubber member of the present invention alternately includes a first surface in contact with the sheet and a second surface not in contact with the sheet on the sheet pasting surface. Therefore, the rubber member of the present invention can reduce the adhesive force with the sheet, and can easily peel off the sheet without damaging the rubber member.

It is a side view of the rubber extrusion apparatus for manufacturing the rubber member of this invention. It is a side view which shows the process in which a rubber member is sent out from the rubber winding body of FIG. It is the sectional view on the AA line of the rubber member of FIG. It is sectional drawing of the rubber member of other embodiment. It is sectional drawing of the rubber member of other embodiment. It is sectional drawing of the rubber member of a comparative example.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a rubber extrusion device 2 for manufacturing the rubber member 1 of the present embodiment. As shown in FIG. 1, the rubber member 1 is obtained by continuously extruding a predetermined compounded rubber previously kneaded with a rubber extrusion device 2 with a constant cross-sectional shape.

  The rubber member 1 is unvulcanized and belt-like, and is used for molding a green tire. The rubber member 1 of the present embodiment is used as, for example, a sidewall rubber of a passenger vehicle tire. The rubber member 1 is not limited to this, and may be used as another member of the green tire, such as a tread rubber or an inner liner.

  The rubber member 1 has a sheet pasting planned surface 10 on which a sheet 5 for preventing adhesion between the rubber members at the time of storage is pasted. In FIG. 1, the lower surface of the rubber member 1 is a sheet pasting planned surface 10. The rubber member 1 extruded from the rubber extruding device 2 is wound up by, for example, the reel 3 and stored as a rubber wound body 7 after the sheet 5 is pasted on the sheet pasting planned surface 10. Such a sheet | seat 5 can suppress effectively that the rubber members 1 at the time of storage contact and adhere directly. As the sheet 5, for example, a sheet made of a synthetic resin such as polyethylene and having a thin thickness that can be freely bent following the rubber member 1 is suitably used.

  As shown in FIG. 2, the rubber member 1 formed as the rubber winding body 7 is sent out from the rubber winding body 7 when the green tire is formed. The rubber member 1 delivered from the rubber winder 7 is cut into a predetermined length after the sheet 5 is peeled off by the sheet take-up device 6, and wound around a tire molding drum (not shown) or the like. .

  FIG. 3 shows a cross-sectional view of the rubber member 1 of FIG. As shown in FIG. 3, the rubber member 1 according to the present embodiment has a thickness that gradually decreases from the central portion 8 in the width direction toward the end portion 9, for example. The shape of the rubber member 1 is not limited to this, and may have a constant thickness.

  The sheet sticking scheduled surface 10 of the rubber member 1 of the present invention alternately includes first surfaces 11 that come into contact with the sheet 5 and second surfaces 12 that are recessed from the first surface 11 and do not come into contact with the sheet 5. The first surface 11 and the second surface 12 are formed by a base 15 (shown in FIG. 1) of the rubber extrusion device 2, and, for example, continuously extend along the longitudinal direction of the rubber member 1.

  When the sheet 5 is affixed to the planned sheet affixing surface 10, the sheet 5 is in contact with the first surface 11 while being separated from the second surface 12. Therefore, the rubber member 1 has a smaller adhesion area with the sheet 5, and as a result, the adhesion force can be reduced. Thereby, the rubber member 1 can peel the sheet | seat 5 easily, without being damaged.

  The contour shape of the sheet pasting planned surface 10 formed by the first surface 11 and the second surface 12 is, for example, formed in a rectangular wave shape by alternately and repeatedly arranging the first surface 11 and the second surface 12, for example. Can be done. For example, even when the composite of the rubber member 1 and the sheet 5 is pressed in the thickness direction, the contact area between the rubber member 1 and the sheet 5 hardly changes. The sheet 5 can be easily peeled off.

  The width W1 of the first surface 11 and the width W2 of the second surface 12 are preferably 2 mm or more, more preferably 2.3 mm or more, preferably 3 mm or less, more preferably 2.7 mm or less. When the widths W1 and W2 are smaller than 2 mm, the adhesiveness with other members at the time of green tire molding may be reduced. When the widths W1 and W2 are larger than 3 mm, the sheet 5 may come into contact with the second surface 12, and the sheet 5 may not be easily peeled off.

  The total ΣW1 of the widths W1 of the first surfaces 11 in the AA line cross section is preferably 0.4 times or more, more preferably 0.45 times or more, and preferably 0.6 times the width Wt of the rubber member 1. It is not more than twice, more preferably not more than 0.55 times. Such a first surface 11 can easily peel off the sheet 5 without bringing the sheet 5 into contact with the second surface 12.

  The amount of depression d1 from the first surface 11 to the second surface 12 is preferably 1 mm or more, more preferably 1.3 mm or more, preferably 2 mm or less, more preferably 1.7 mm or less. If the dent d1 is smaller than 1 mm, the sheet 5 may not be easily peeled off. When the dent amount d1 is larger than 2 mm, the adhesive force between the sheet pasting planned surface 10 and other members of the green tire may be reduced.

  FIG. 4 shows another embodiment of the rubber member 1. As shown in FIG. 4, the contour shape of the sheet pasting planned surface 10 may be, for example, a trapezoidal wave shape. Such a sheet sticking scheduled surface 10 can be easily flattened by bonding the rubber member 1 when the rubber member 1 is pressed, for example, when it is attached to another member at the time of green tire molding. You can increase your power.

  FIG. 5 shows still another embodiment of the sheet pasting planned surface 10. As shown in FIG. 5, the contour shape of the sheet pasting planned surface 10 may be wavy. Such a sheet sticking scheduled surface 10 further reduces the contact area between the rubber member 1 and the sheet 5 and facilitates the peeling of the sheet 5. Moreover, when the sheet sticking planned surface 10 is attached to another rubber member at the time of green tire molding, the adhesive surface can be easily flattened and the adhesive force can be increased.

  Although the rubber member of the present invention has been described in detail above, the present invention is not limited to the illustrated embodiment, and can be implemented with various modifications.

   A rubber member having the cross-sectional shape of FIG. 3, FIG. 4, or FIG. 5 and applied to the side wall rubber of a passenger car tire having a size of 195 / 65R15 was prototyped based on the specifications in Table 1. As a comparative example, as shown in FIG. 6, a rubber member having a flat sheet pasting surface was manufactured. As shown in FIG. 2, each rubber member was sent out from the rubber winding body by 50 m, and the sheet was peeled off by the sheet take-up device. At this time, the number of times the rubber member was damaged and the number of times the sheet picking device could not separate the sheet were measured. The test method is as follows.

<Number of times the rubber member has been damaged>
Whether or not the rubber member produced when the sheet was peeled from the rubber member was damaged was confirmed by the naked eye, and the number of occurrences was measured.

<Number of times the sheet could not be peeled>
As shown in FIG. 2, when the sheet was peeled from the rubber member by the sheet pick-up device, the number of times that the sheet could not be peeled due to the high adhesive force between them was measured.
The test results are shown in Table 1.

  As is clear from Table 1, in Comparative Examples 1 to 3, damage to the rubber member and stop of the molding machine occurred. Moreover, these problems occur more frequently as the outside air temperature increases. On the other hand, in Examples 1 to 13, these defects hardly occur. Therefore, it was confirmed that the rubber member of the present invention can easily peel the sheet.

DESCRIPTION OF SYMBOLS 1 Rubber member 5 Sheet | seat 10 Sheet sticking plan surface 11 1st surface 12 2nd surface

Claims (6)

A composite of an unvulcanized and belt-shaped rubber member used to form a green tire and a sheet for preventing adhesion between the rubber members during storage,
The rubber member has a sheet sticking planned surface to which the sheet is attached,
In a cross section perpendicular to the longitudinal direction of the rubber member, the sheet sticking scheduled surface alternately includes a first surface that contacts the sheet and a second surface that does not contact the sheet by being recessed from the first surface. ,
In the cross section, the total ΣW1 width W1 of the first surface, Ri 0.45-0.55 Baidea width of the rubber member,
The sheet is affixed to the surface where the sheet is scheduled to be peeled,
A composite of a rubber member and a sheet, wherein the sheet is in contact with the first surface and is separated from the second surface. The composite of a rubber member and a sheet according to claim 1, wherein the first surface and the second surface continuously extend along the longitudinal direction . 3. The composite of a rubber member and a sheet according to claim 1, wherein, in the cross section, the sheet sticking planned surface has a rectangular wave shape or a trapezoidal wave shape outline . 4. The composite of a rubber member and a sheet according to claim 1, wherein in the cross section, a width W <b> 1 of the first surface and a width W <b> 2 of the second surface are 2 to 3 mm . 5. The composite of a rubber member and a sheet according to claim 1, wherein the second surface is recessed by 1 to 2 mm from the first surface in the cross section . 6. The composite of a rubber member and a sheet according to claim 1, wherein each of the first surfaces is arranged on the same straight line in the cross section.

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