Strip, method for manufacturing the same, and method for manufacturing pneumatic tire

Patent metadata

Field	Value
Publication number	US-10239271-B2
Application number	US-201615137291-A
Country	US
Kind code	B2
Filing date	Apr 25, 2016
Priority date	Nov 5, 2010
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

A strip of a thermoplastic elastomer to be wound spirally on a cylindrical drum for forming an inner liner for a tire having a shape close to a finished sectional shape is provided. The strip is formed of composite layers of (A) a first layer made of a styrene-isobutylene-styrene triblock copolymer and (B) a second layer containing at least one of a styrene-isoprene-styrene triblock copolymer and a styrene-isobutylene diblock copolymer. The strip further has a strip main body and ear portions arranged on opposite sides thereof. The strip main body has a thickness (T1) of 0.05 mm to 1.0 mm. The ear portions have a thickness (T2) thinner than the thickness (T1) of the strip main body and a width (W2) of 0.5 mm to 5.0 mm. This ribbon-shaped strip reduces unevenness of the surface of a sheet formed by the opposite ends of the strip when manufacturing an inner liner.

First claim

The invention claimed is:

1. A method for manufacturing a pneumatic tire in which a strip is wound spirally on a cylindrical drum such that a strip main body forms overlapping portions to form an inner liner, and the inner liner is disposed on an inner surface of a raw tire, and then vulcanization is performed wherein,
said strip being formed of composite layers of
(A) a first layer made of a styrene-isobutylene-styrene (SIBS) triblock copolymer, and
(B) a second layer comprising:
(b1) a layer made of a styrene-isoprene-styrene (SIS) triblock copolymer; and
(b2) a layer made of a styrene-isobutylene (SIB) diblock copolymer containing at least one additive selected from the group consisting of stearic acid, zinc oxide, antioxidant, vulcanization accelerator, and sulfur, and disposed adjacently to a carcass ply,

said strip further having ear portions on opposite sides of the strip main body,
said strip main body having a thickness of 0.05 mm to 1.0 mm, and
said ear portions having a thickness thinner than the thickness of said strip main body and a width of 0.5 mm to 5.0 mm.

2. The method for manufacturing a pneumatic tire according to claim 1 , wherein said strip has a width of 5 mm to 40 mm.

3. The method for manufacturing a pneumatic tire according to claim 1 , wherein said ear portions of said strip have a thickness of 0.02 mm to 0.5 mm.

4. The method for manufacturing a pneumatic tire according to claim 1 , wherein said first layer has a thickness of 0.05 mm to 0.6 mm, and the second layer has a thickness of 0.01 mm to 0.3 mm.

5. The method for manufacturing a pneumatic tire according to claim 1 , said strip being obtained by a manufacturing method including the steps of:
(a) coextruding the first layer with the second layer by an extruder having an extruder main body and an extrusion head to form a sheet having a horizontally long rectangular cross sectional shape;
(b) passing the sheet through a pair of die rollers and transferring a shape of the die rollers on said sheet to form the strip having the ear portions on opposite sides of the main body; and
(c) detaching said strip from the die rollers.

Assignees

• Sumitomo Rubber Ind

Inventors

• Sugimoto Mutsuki

Classifications

• B29C43/24

  Calendering · CPC title

• B29C48/12

  Articles with an irregular circumference when viewed in cross-section, e.g. window profiles · CPC title

• B29D30/0601

  Vulcanising tyres; Vulcanising presses for tyres · CPC title

• B29D30/3028

  by feeding a continuous band and winding it helically, i.e. the band is fed while being advanced along the drum axis, to form an annular element (winding and joining, helically in general B29C53/58) · CPC title

• C08L53/02

  of vinyl-aromatic monomers and conjugated dienes · CPC title