Pneumatic tire

Abstract

A pneumatic tire using as an air permeation prevention layer a film consisting of thermoplastic resin or thermoplastic elastomer composition obtained by blending thermoplastic resin with elastomer, wherein the film is prevented form being peeled off to prevent entry of a release agent into the interior and the internal view of the tire is improved. An air permeation prevention layer ( 10 ) disposed on the inner side of the tire is constituted of a laminate ( 14 ) obtained by layering ribbon-form elastomer layers ( 12, 13 ) on the opposite sides of a ribbon-form film ( 11 ). The laminate ( 14 ) is wound in the tire circumferential direction while being overlapped partially and deviated at specified intervals. Respective adjoining winding portions ( 14 A 1, 14 A 2 ) of the laminate ( 14 ) are joined by being overlapped partially with ribbon-form films ( 11 ) kept separated from each other.

1 . A pneumatic tire having an air impermeable layer disposed on an inner side of the tire, the air impermeable layer being formed of a thermoplastic resin or thermoplastic elastomer composition comprising a blend of a thermoplastic resin and an elastomer, wherein:
 the film is formed from a ribbon-shaped film;   the air impermeable layer is formed from a laminated body comprising the ribbon-shaped film and at least two ribbon-shaped elastomer plies laminated on opposite sides thereof, the laminated body being wound in a circumferential direction of the tire in such a partially overlapping manner that it is displaced at prescribed intervals;   the wound laminated body has partially overlapping wound portions; and   each pair of adjacent wound portions of the laminated body are spliced to each other in a partially overlapping manner in a state where the ribbon-shaped film is disengaged from itself.   
   
   
       2 . The pneumatic tire according to  claim 1 , wherein;
 the ribbon-shaped film and the at least two ribbon-shaped elastomer plies each have opposite ends comprising one end on one side of the laminated boy in a widthwise direction thereof and the other end on the other side of the laminated boy in the widthwise direction thereof; and   each pair of adjacent wound portions of the laminated body are partially overlapped with each other in a state where the one end of the ribbon-shaped film and the other end of any one of the at least two ribbon-shaped elastomer plies are spliced to each other in an overlapping manner.   
   
   
       3 . The pneumatic tire according to  claim 1 , wherein;
 one ribbon-shaped elastomer ply of the at least two ribbon-shaped elastomer plies is less in width than the ribbon-shaped film;   the laminated body is arranged such that the one end of the ribbon-shaped film and the one end of the one ribbon-shaped elastomer ply are offset from each other in the widthwise direction of the laminated body; and   each pair of adjacent wound portions of the laminated body are partially overlapped with each other in a state where the one end of the ribbon-shaped film and the other end of the other ribbon-shaped elastomer ply of the at least two ribbon-shaped elastomer plies are spliced to each other in an overlapping manner.   
   
   
       4 . The pneumatic tire according to  claim 3 , wherein;
 the other ribbon-shaped elastomer ply is less in width than the ribbon-shaped film;   the laminated body is arranged such that the other end of the ribbon-shaped film and the other end of the other ribbon-shaped elastomer ply are offset from each other in the widthwise direction of the laminated body; and   each pair of adjacent wound portions of the laminated body are partially overlapped with each other in a state where the one end of the one ribbon-shaped elastomer ply and the other end of the ribbon-shaped film are spliced to each other in an overlapping manner.   
   
   
       5 . The pneumatic tire according to  claim 4 , wherein an offset amount between the one end of the ribbon-shaped film and the one end of the one ribbon-shaped elastomer ply, and an offset amount between the other end of the ribbon-shaped film and the other end of the other ribbon-shaped elastomer ply are at least 2 mm, respectively. 
   
   
       6 . The pneumatic tire according to  claim 1 , wherein;
 the ribbon-shaped film and the at least two ribbon-shaped elastomer plies each have opposite ends comprising one end on one side of the laminated boy in a widthwise direction thereof and the other end on the other side of the laminated boy in the widthwise direction thereof; and   each pair of adjacent wound portions of the laminated body are partially overlapped with each other in a state where the one end of any one of the at least two ribbon-shaped elastomer plies and the other end of any one of the at least two ribbon-shaped elastomer plies are spliced to each other in an overlapping manner.   
   
   
       7 . The pneumatic tire according to  claim 6 , wherein;
 the at least two ribbon-shaped elastomer plies are greater in width than the ribbon-shaped film;   one ribbon-shaped elastomer ply of the at least two ribbon-shaped elastomer plies is laminated on the ribbon-shaped film so as to be offset toward the other side of the laminated body in the widthwise direction thereof with respect to the ribbon-shaped film;   the other ribbon-shaped elastomer ply of the at least two ribbon-shaped elastomer plies is laminated on the ribbon-shaped film so as to be offset toward the one side of the laminated body in the widthwise direction thereof with respect to the ribbon-shaped film; and   each pair of adjacent wound portions of the laminated body are partially overlapped with each other in a state where the one end and the other end of the one ribbon-shaped elastomer ply are spliced to each other in a directly overlapping manner, and where the one end and the other end of the other ribbon-shaped elastomer ply are spliced to each other in a directly overlapping manner.   
   
   
       8 . The pneumatic tire according to  claim 6 , wherein;
 the at least two ribbon-shaped elastomer plies have same widths as the ribbon-shaped film;   one ribbon-shaped elastomer ply of the at least two ribbon-shaped elastomer plies is laminated on the ribbon-shaped film so as to be offset toward the other side of the laminated body in the widthwise direction thereof with respect to the ribbon-shaped film;   the other ribbon-shaped elastomer ply of the at least two ribbon-shaped elastomer plies is laminated on the ribbon-shaped film in an entirely overlapping manner; and   each pair of adjacent wound portions of the laminated body are partially overlapped with each other in a state where the one end of the ribbon-shaped film and the other end of the other ribbon-shaped elastomer ply are spliced to each other in a directly overlapping manner, and where the one end and the other end of the one ribbon-shaped elastomer ply are spliced to each other in a directly overlapping manner.   
   
   
       9 . The pneumatic tire according to  claim 6 , wherein;
 the at least two ribbon-shaped elastomer plies have same widths as the ribbon-shaped film;   one ribbon-shaped elastomer ply of the at least two ribbon-shaped elastomer plies is laminated on the ribbon-shaped film in an entirely overlapping manner;   the other ribbon-shaped elastomer ply of the at least two ribbon-shaped elastomer plies is laminated on the ribbon-shaped film so as to be offset toward the one side of the laminated body in the widthwise direction thereof with respect to the ribbon-shaped film; and   each pair of adjacent wound portions of the laminated body are partially overlapped with each other in a state where the one end of the one ribbon-shaped elastomer ply and the other end of the ribbon-shaped film are spliced to each other in a directly overlapping manner, and where the one end and the other end of the other ribbon-shaped elastomer ply are spliced to each other in a directly overlapping manner.   
   
   
       10 . The pneumatic tire according to  claim 7 , wherein an offset amount of the one ribbon-shaped elastomer ply is at least 2 mm. 
   
   
       11 . The pneumatic tire according to  claim 7 , wherein an offset amount of the other ribbon-shaped elastomer ply is at least 2 mm. 
   
   
       12 . The pneumatic tire according to  claim 3 , wherein the other ribbon-shaped elastomer ply is disposed inward of the ribbon-shaped film. 
   
   
       13 . The pneumatic tire according to  claim 1 , wherein the ribbon-shaped film has a width of 5 mm to 70 mm. 
   
   
       14 . The pneumatic tire according to  claim 8 , wherein an offset amount of the one ribbon-shaped elastomer ply is at least 2 mm. 
   
   
       15 . The pneumatic tire according to  claim 9 , wherein an offset amount of the other ribbon-shaped elastomer ply is at least 2 mm.