Method for manufacturing pneumatic tire

Patent metadata

Field	Value
Publication number	US-10792879-B2
Application number	US-201815905624-A
Country	US
Kind code	B2
Filing date	Feb 26, 2018
Priority date	Jul 31, 2012
Publication date	Oct 6, 2020
Grant date	Oct 6, 2020

Abstract

A pneumatic tire is formed by winding a sheet member (A) and a sheet member (B) onto a molding drum and molding a cylindrical body. A laminate body (M) in which the sheet member (B) is layered in advance on the outer periphery of the sheet member (A) is wound onto a molding drum (10), the tack value of a material (a) constituting the sheet member (A) being smaller than the tack value of a material (b) constituting the sheet member (B), the length of the sheet member (A) being configured so that a starting end (As) of winding on the molding drum (10) and an ending end (Ae) of winding do not overlap, and the length of the sheet member (B) being configured so that the ending end (Be) of winding extends longer in the circumferential direction than the ending end (Ae) of winding of the sheet member (A).

First claim

What is claimed is:

1. A method for manufacturing a pneumatic tire having a step for winding a sheet member (A) and a sheet member (B) onto a molding drum and molding a cylindrical body, the sheet member (A) being an inner liner and the sheet member (B) being a tie rubber layer, the method comprising the steps of:
combining the sheet member (A) with the sheet member (B), wherein a tack value of a material (a) constituting the sheet member (A) is smaller than a tack value of a material (b) constituting the sheet member (B);
winding, on the molding drum, a laminate body obtained by layering in advance the sheet member (B) on an outer periphery of the sheet member (A), wherein the laminate body is wound on the molding drum such that sheet member (A) is in contact with the molding drum;
configuring a length of the sheet member (A) so that a starting end of winding of the sheet member (A) does not overlap with an ending end of winding of the sheet member (A) on the molding drum;
configuring a length of the sheet member (B) so that at least an ending end of winding of the sheet member (B) extends longer in a circumferential direction of the molding drum than the ending end of winding of the sheet member (A); and
winding a carcass layer on an outer periphery of the laminate body such that the tie layer is between the inner liner and the carcass layer; wherein
the ending end of winding of the sheet member (B) is overlapped with and joined on an outer diameter side of a starting end of winding of the sheet member (B); and
the starting end of winding of the sheet member (B) is made to extend longer in the circumferential direction than the starting end of winding of the sheet member (A).

2. The method for manufacturing a pneumatic tire according claim 1 , wherein a plurality of the laminate bodies are overlapped and wound on the molding drum, and joint portions of the respective laminate bodies are arranged so as not to overlap in a radial direction.

3. The method for manufacturing a pneumatic tire according claim 2 , wherein end portions of sheet members (A) of the respective laminate bodies are arranged so as to be mutually separated by 10% or more of a tire circumferential length.

4. The method for manufacturing a pneumatic tire according to claim 3 , wherein the material (a) is a thermoplastic resin composition including a thermoplastic resin and an elastomer, and the thermoplastic resin is a continuous phase and the elastomer is a dispersed phase.

5. The method for manufacturing a pneumatic tire according to claim 4 , wherein the elastomer is from 50 to 85 weight % when a sum of the thermoplastic resin and elastomer is 100 weight %.

6. The method for manufacturing a pneumatic tire according to claim 5 , wherein the thermoplastic resin composition includes at least one type of thermoplastic resin selected from a polyamide resin, a polyvinyl resin, and a polyester resin.

7. The method for manufacturing a pneumatic tire according claim 1 , wherein a plurality of the laminate bodies are overlapped and wound on the molding drum, and end portions of sheet members (A) of the respective laminate bodies are arranged so as to be mutually separated by 10% or more of a tire circumferential length.

8. The method for manufacturing a pneumatic tire according to claim 1 , wherein the material (a) is a thermoplastic resin composition including a thermoplastic resin and an elastomer, and the thermoplastic resin is a continuous phase and the elastomer is a dispersed phase.

9. The method for manufacturing a pneumatic tire according to claim 8 , wherein a percentage of the elastomer is from 50 to 85 weight % when a sum of the thermoplastic resin and the elastomer is 100 weight %.

10. The method for manufacturing a pneumatic tire according to claim 8 , wherein the thermoplastic resin composition includes at least one type of thermoplastic resin selected from a polyamide resin, a polyvinyl resin, and a polyester resin.

11. The method for manufacturing a pneumatic tire according to claim 1 , wherein the material (b) is a rubber composition consisting of at least one selected from natural rubber, isoprene rubber, styrene butadiene rubber, butadiene rubber, butyl rubber, and halogenated butyl rubber.

12. The method for manufacturing a pneumatic tire according to claim 1 , wherein the sheet member (B) and the sheet member (A) are bonded using an adhesive composition, and the adhesive composition includes a compound represented by formula (1) below or a condensate of the compound represented by formula (1) below and formaldehyde,

wherein R 1 , R 2 , R 3 , R 4 and R 5 are hydrogen, a hydroxyl group or an alkyl group having from 1 to 8 carbons.

13. The method for manufacturing a pneumatic tire according to claim 1 , further comprising forming the end of the laminate body diagonally so that an end of the laminate body in the circumferential direction inclines at an angle of from 10° and 85° relative to a tire circumferential direction; and molding the pneumatic tire with the inclined angle of the end of the laminate body.

14. The method for manufacturing a pneumatic tire according to claim 1 , wherein a band-like member is applied on an outer periphery of the sheet member (B) so as to cover a joint portion of the starting end of winding and ending end of winding of the sheet member (B), and a tensile stress at a time of 20% elongation at 25° C. of a material (c) constituting the band-like member is from 1 to 3 times a tensile stress at a time of 20% elongation at 25° C. of the material (a).

15. The method for manufacturing a pneumatic tire according to claim 1 , wherein the molding drum has a mechanism for adhering the sheet member (A) to a portion of a drum surface.

16. The method for manufacturing a pneumatic tire according to claim 1 , wherein the joint portion of the laminate body and a joint portion of the carcass layer overlap in the radial direction when the laminate body is wound on the molding drum and the carcass layer is wound on the outer periphery of the laminate body.

17. The method for manufacturing a pneumatic tire according to claim 1 , wherein after the sheet member (A) undergoes biaxially oriented processing, the sheet member (B) is layered on the outer periphery of the sheet member (A).

18. A pneumatic tire obtained by the method for manufacturing a pneumatic tire described in claim 1 .

Assignees

• Yokohama Rubber Co Ltd

Inventors

• Hara Yuichi
• Seto Hideki

Classifications

• B29D30/3007

  by feeding a sheet perpendicular to the drum axis and joining the ends to form an annular element (bending sheets and joining the edges B29C53/42) · CPC title

• B60C5/14

  with impervious liner or coating on the inner wall of the tyre · CPC title

• B60C1/00

  Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition · CPC title

• B29D2030/0682

  Inner liners · CPC title

• B60C2005/145

  made of laminated layers · CPC title