Method and device for the perforated cutting of a reinforcing ply

Patent metadata

Field	Value
Publication number	US-9701079-B2
Application number	US-201214366036-A
Country	US
Kind code	B2
Filing date	Dec 12, 2012
Priority date	Dec 19, 2011
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

A cutting blade, which is useable for cutting a reinforcing strip into reinforcing plies, includes one or more notches disposed at given intervals. When a volume of rubber separating two reinforcing threads is cut by the cutting blade, bridges of rubber are left between a rear edge of a first reinforcing ply and a front edge of a second reinforcing ply.

First claim

The invention claimed is:

1. A method for producing a reinforcing ply used in a tyre, the ply including reinforcing threads that are coated in a rubber mixture, the threads being arranged parallel to one another and forming a given angle (α) with a longitudinal direction of the ply, the method comprising steps of:
cutting through a rubber portion located between two adjacent threads of a reinforcing strip, so as to separate a rear edge (N 1r ) of a first reinforcing ply (N 1 ) of the reinforcing strip from a front edge (N 2f ) of a second reinforcing ply (N 2 ) of the reinforcing strip; and
removing the first reinforcing ply (N 1 ) from the reinforcing strip after a predetermined relaxation period has elapsed, the first reinforcing ply (N 1 ) having a given length,
wherein, in the cutting step, cutting of the rubber portion is interrupted at predetermined intervals in order to leave bridges of rubber between the rear edge (N 1r ) of the first reinforcing ply (N 1 ) and the front edge (N 2f ) of the second reinforcing ply (N 2 ).

2. The method according to claim 1 , wherein the threads of the reinforcing ply form an angle (α) of between 45° and 90° with a longitudinal direction of the reinforcing ply.

3. The method according to claim 1 , wherein the bridges of rubber have a length, measured along a thread at an edge, of between 0.5 mm and 2 mm.

4. The method according to claim 1 , wherein the bridges of rubber are spaced apart by a length, measured along a thread at an edge, of between 1 cm and 15 cm.

5. The method according to claim 1 , wherein, during the step of removing the first reinforcing ply (N 1 ) from the reinforcing strip, the first reinforcing ply (N 1 ) is detached from the reinforcing strip by stretching the bridges of rubber located between the rear edge (N 1r ) of the first reinforcing ply (N 1 ) and the front edge (N 2f ) of the second reinforcing ply (N 2 ) until the bridges of rubber break.

6. The method according to claim 1 , wherein the relaxation period is at least greater than ten seconds.

Assignees

• Michelin & Cie
• Michelin Rech Tech

Inventors

• Ducros Thierry
• Ravat Stéphane
• Deboeuf Michel

Classifications

• B26D2001/006

  the cutting blade having a special shape, e.g. a special outline, serrations · CPC title

• B29D30/0061 Primary

  Accessories, details or auxiliary operations not otherwise provided for · CPC title

• B26F1/3866

  specially adapted for rubber · CPC title

• B26D3/003

  specially adapted for cutting rubber · CPC title

• B26D1/0006

  Cutting members therefor · CPC title