JP2006256565A - Pneumatic tire, and woven textile for tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pneumatic tire capable of enhancing the durability of a bead part while using non-twisted multifilament yarns for a flat woven textile of a bead part protective layer, and a woven fabric for the tire. <P>SOLUTION: The woven textile for the tire consists of a flat woven textile 6 using interlace yarns 9 of non-twisted multifilament 7 for at least one of the warp 4 and the weft 5. Further, in the pneumatic tire, the flat woven textile 6 is arranged as a bead part protective layer 3 on a surface layer portion with a bead part 1 in contact with a rim 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pneumatic tire and a tire fabric, and more particularly, to a pneumatic tire and a tire for improving bead portion durability when a non-twisted multifilament yarn is used for a plain fabric of a bead portion protective layer. It relates to textiles.

  In order to reinforce the contact portion with the rim, a bead portion protective layer made of a plain fabric is disposed on the bead portion of the pneumatic tire. Conventionally, a multifilament twist yarn is generally used for the warp and weft constituting this plain fabric (see, for example, Patent Document 1). However, multifilament twisted yarns require a twisting process, which has been one of the factors that reduce the productivity of plain fabrics. Against this background, in recent years, untwisted multifilaments have been widely used to improve the productivity of plain fabrics.

However, untwisted multifilaments have the property that they are poorly converged and easily break apart, so that during the processing steps such as weaving and dipping, the yarns are deformed so that they spread, so that the gaps between the warp and weft yarns in the fabric There is a problem that the adhesive strength between the plain woven fabric and the rubber is reduced. There was a concern that this would eventually affect the durability of the bead portion.
JP 2004-238767 A

  The object of the present invention is to solve the problems in the background as described above, and to improve the bead portion durability while using the non-twisted multifilament yarn for the plain fabric of the bead portion protective layer. It is to provide a pneumatic tire and a tire fabric.

  In order to achieve the above object, the pneumatic tire of the present invention is a pneumatic tire in which a bead portion protective layer made of a plain woven fabric is arranged on a surface layer portion where the bead portion contacts the rim. On the other hand, the gist is that an unlaced multifilament interlace yarn is used.

  Further, the gist of the tire fabric of the present invention is that it comprises a plain fabric in which at least one of warp and weft is a non-twisted multifilament interlaced yarn.

  According to the present invention, since at least one of the warp and the weft constituting the plain fabric of the bead portion protective layer is an untwisted multifilament interlaced yarn, the non-twisted multifilament is provided with a converging property similar to that of the twisted yarn. Through a processing step such as a dipping treatment, a sufficient porosity can be secured for the rubber to penetrate between the warp and weft in the fabric. Thereby, the fall of the adhesive force of a plain fabric and rubber | gum is suppressed, and bead part durability can be improved.

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

  FIG. 1 is a partial cross-sectional view showing an example of the structure of a bead portion in the pneumatic tire of the present invention. In FIG. 1, a bead portion protective layer 3 is disposed on the surface layer portion of the bead portion 1 that contacts the rim 2. As shown in FIG. 2, the bead part protective layer 3 is composed of a plain fabric 6 composed of warps 4 and wefts 5.

  As illustrated in FIG. 3, at least one of the warp 4 and the weft 5 is made to pass through the interlacer 8 in which the untwisted multifilaments 7 are aligned and the air jet flow is jetted inward. A non-twisted interlaced yarn 9 in which entangled portions 7a and unentangled portions 7b are alternately formed in the longitudinal direction is used.

  As described above, by using the interlace yarn 9 for the warp yarn 4 and / or the weft yarn 5, the non-twisted multifilament 7 is provided with a converging property similar to that of the twisted yarn, and the warp yarn in the fabric is obtained through processing steps such as weaving and dipping treatment. 4. A sufficient porosity can be secured for the rubber to penetrate between the wefts 5. Thereby, the fall of the adhesive force of the plain fabric 6 and rubber | gum is suppressed, and durability of the bead part 1 can be improved.

  In the present invention, the average length j of the entangled portion 7a in the interlace yarn 9 may be adjusted to 3 mm or more, and the average length k of the non-entangled portion 7b may be adjusted to 5 mm or less. Thereby, the converging property between the multifilaments 7 is enhanced, the porosity between the warp 4 and the weft 5 in the woven fabric is further ensured, and the decrease in the adhesive force between the bead portion protective layer 3 and the rubber is ensured. Can be suppressed.

  The average length of the entangled portion 7a and the non-entangled portion 7b described above refers to the total average when 10 locations are sampled at random. Further, the interlace yarn 9 in the present invention includes a case where the entire length is composed of the entangled portion 7a.

  In the present invention, the number of filaments constituting the interlaced yarn 9 is 10 to 500, and the total fineness thereof is adjusted to 400 to 4500 dtex, preferably 400 to 2000 dtex. Further, the weave density of the plain woven fabric 6 may be adjusted to 10 to 50 pieces / 5 cm, preferably 30 to 50 pieces / 5 cm. Thereby, the converging property of the multifilament 7 can be improved, and at the same time, a sufficient porosity can be secured between the warp 4 and the weft 5 in the woven fabric.

  If the total fineness is less than 400 dtex, the effect of protecting the bead portion 1 is reduced, and if it exceeds 4500 dtex, it is necessary to increase the thickness of the rubber covering the interlace yarn 9, which is not economical. If the weaving density is less than 10/5 cm, the effect of protecting the bead portion 1 will be reduced. If the weaving density exceeds 50/5 cm, the gap between the warp 4 and the weft 5 will be too narrow even if the interlaced yarn 9 is used. Thus, the adhesive force between the plain fabric 6 and the rubber is reduced.

  In the embodiment described above, the case where the plain woven fabric 6 is used for the bead portion protective layer 3 has been described. However, the plain woven fabric 6 in the present invention suppresses a decrease in adhesive strength with rubber, and the bead portion protective layer. Without being limited to 3, it can be widely applied as a reinforcing fabric in each part of the tire.

  A conventional tire (conventional example) in which all the specifications except the tire size (265 / 70R16) and the bead portion protective layer are common, and a plain woven fabric having warp and weft yarns different from each other as shown in Table 1 is arranged as a bead portion protective layer. 1) and tires of the present invention (Examples 1 to 4) were produced. The filament material constituting the warp and weft in each bead portion protective layer was 66 nylon, the number of filaments was 14, the total fineness of the yarn was 470 dtex, and the weave density of the plain fabric was 40 / 5cm.

These five types of tires were mounted on a rim (16 × 7 JJ), and run on an indoor rotating drum tester (diameter: 1707 mm) for 6480 km under conditions of an air pressure of 120 kPa, a load of 14 kN, and a speed of 81 km / h. The bead portion of each tire after running was disassembled to expose the bead portion protective layer, and a plain fabric peel test was performed along the warp of the bead portion protective layer from the rim flange side of the bead portion. From the result, the adhesive force per 25 mm width of the plain woven fabric was calculated, and the calculation result was converted into an index with Conventional Example 1 being 100, and is also shown in Table 1. The larger the value, the better the adhesion between the bead part protective layer and the rubber.

  From the results in Table 1, it can be seen that the tire of the present invention has better adhesion between the bead portion protective layer and the rubber than the conventional tire.

It is a partial cross section figure showing an example of the structure of the bead part of the pneumatic tire by the embodiment of the present invention. It is a partial top view which shows the structure of the plain fabric which comprises the bead part protective layer in the pneumatic tire of FIG. It is explanatory drawing which illustrates the formation process of the untwisted multifilament in the thread | yarn which comprises the plain fabric of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bead part 2 Rim 3 Bead part protective layer 4 Warp 5 Weft 6 Plain fabric 7 Untwisted multifilament 7a Entangled part 7b Unentangled part 8 Interlacer 9 Interlaced yarn

Claims (8)

In a pneumatic tire in which a bead part protective layer made of a plain woven fabric is arranged on the surface layer part where the bead part contacts the rim,
A pneumatic tire using a non-twisted multifilament interlace yarn for at least one of the warp and weft of the plain fabric.   The pneumatic tire according to claim 1, wherein an average length of the entangled portion in the interlace yarn is 3 mm or more and an average length of the non-entangled portion is 5 mm or less.   The pneumatic tire according to claim 1 or 2, wherein the number of filaments constituting the interlaced yarn is 10 to 500, and the total fineness is 400 to 4500 dtex.   The pneumatic tire according to claim 1, 2 or 3, wherein the plain fabric has a weave density of 10 to 50 / 5cm.   A tire fabric comprising a plain fabric in which at least one of warp and weft is an untwisted multifilament interlace yarn.   The tire fabric according to claim 5, wherein an average length of the entangled portions in the interlace yarn is 3 mm or more and an average length of the non-entangled portions is 5 mm or less.   The tire fabric according to claim 5 or 6, wherein the number of filaments constituting the interlace yarn is 10 to 500, and the total fineness is 400 to 4500 dtex. The tire fabric according to claim 5, 6, or 7, wherein the plain fabric has a weave density of 10 to 50 / 5cm.

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