Apparatus for molding a tire molding bladder

• US 4,082,490 A
• Filed: 12/22/1976
• Issued: 04/04/1978
• Est. Priority Date: 01/02/1976
• Status: Expired due to Term

• Current Assignee: Compagnie Generale DES Etablissements Michelin SCA
• Original Assignee: Compagnie Generale DES Etablissements Michelin SCA
• Inventors: Chateau, Jacques
• Primary Examiner(s): Flint, Jr., J. Howard
• Application Number:
  US05/753,606
• Time in Patent Office: 468 Days
• Field of Search: 425/50, 425/51, 425/52, 425/384, 425/394, 425/398, 425/407, 425/542, 425/544, 425/547, 425/412
• US Class Current: 425/412
• CPC Class Codes: B29C 33/10 with incorporated venting means
• CPC Class Codes: B29C 43/021 characterised by the shape of the surface
• CPC Class Codes: B29C 43/104 the mould cavity lying totally outside the axis of symmetry, e.g. toroidal moulds
• CPC Class Codes: B29C 43/12 using bags surrounding the moulding material or using membranes contacting the moulding material
• CPC Class Codes: B29C 43/3642 Bags, bleeder sheets or cauls for isostatic pressing
• CPC Class Codes: B29D 2030/0655 Constructional or chemical features of the flexible cores
• CPC Class Codes: B29D 30/0654 Flexible cores therefor, e.g. bladders, bags, membranes, diaphragms elastic cores or mandrels for shaping of plastics B29C33/505; bags for isostatic pressing in compression moulding B29C43/12, B29C43/3642
• CPC Class Codes: B29D 99/005 Producing membranes
• CPC Class Codes: B29K 2995/0072 Roughness, e.g. anti-slip
• CPC Class Codes: B29K 2995/0074 patterned, grained
• CPC Class Codes: B29L 2030/00 Pneumatic or solid tyres or parts thereof conveyor belts B29L2031/7092; drive belts B29L2031/7094; fourdrinier belts B29L2031/733
• CPC Class Codes: B29L 2031/755 Membranes, diaphragms

Abstract

A bladder for use in a tire molding and vulcanization press has grooves in its outer face and a circumferential molding flash on its inner face. A process for the manufacture of this membrane by molding uses a press having a ribbed core to produce the grooves and two shells which may have smooth walls.

Claims

1. A press for manufacturing a sleeve which is invertible into a resulting elastic bladder for use in a tire molding and vulcanization press, said sleeve press having a core and two shells which can be joined to each other, characterized by the fact that the outer wall of the core has raised elements in relief for producing recessed elements in the inner face of the invertible sleeve.

2. The sleeve press according to claim 1, characterized by the fact that the inner walls of the two shells are smooth.

3. The sleeve press according to claim 1, characterized by the fact that the raised elements in relief on the outer wall of the core are ribs.