GB664730A - Improvements relating to the manufacture of moulded articles composed of a plastic, for example elastic rubber - Google Patents

Improvements relating to the manufacture of moulded articles composed of a plastic, for example elastic rubber

Info

Publication number
GB664730A
GB664730A GB18750/49A GB1875049A GB664730A GB 664730 A GB664730 A GB 664730A GB 18750/49 A GB18750/49 A GB 18750/49A GB 1875049 A GB1875049 A GB 1875049A GB 664730 A GB664730 A GB 664730A
Authority
GB
United Kingdom
Prior art keywords
mould
metal
pressing
sintering
july
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB18750/49A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pirelli and C SpA
Original Assignee
Pirelli SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pirelli SpA filed Critical Pirelli SpA
Publication of GB664730A publication Critical patent/GB664730A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
    • B29C33/3814—Porous moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/10—Moulds or cores; Details thereof or accessories therefor with incorporated venting means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material

Abstract

664,730. Making dies. PIRELLI SOC. PER AZIONI. July 15, 1949 [July 20, 1948], No. 18750/49. Drawings to Specification. Class 83 (ii). [Also in Group V] Powder metallurgy.-Sintered micro-porous metal is used as the mould, or the operative surface of the mould, in a process for making plastic articles, e.g. vulcanized rubber articles, this metal resulting in a venting of air trapped within the mould. The mould, or the operative part thereof, may be machined from stock micro-porous metal obtained by hot-pressing metal powder and then sintering: the powders used may be of different grain size. Alternatively, the. mould may be produced by pressmoulding a hot mass of metal powder (using a counter-die which is the obverse of the mould to be formed) and then sintering the shaped pressing, with or without subsequent coldsizing to impart to the pressing a smooth polished surface; the cold-sizing step may be carried into effect on the counter-die. The metal may be iron, iron alloy or aluminium; a steel mould may have a pore volume of 30 per cent.
GB18750/49A 1948-07-20 1949-07-15 Improvements relating to the manufacture of moulded articles composed of a plastic, for example elastic rubber Expired GB664730A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT664730X 1948-07-20

Publications (1)

Publication Number Publication Date
GB664730A true GB664730A (en) 1952-01-09

Family

ID=11298459

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18750/49A Expired GB664730A (en) 1948-07-20 1949-07-15 Improvements relating to the manufacture of moulded articles composed of a plastic, for example elastic rubber

Country Status (1)

Country Link
GB (1) GB664730A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1271379B (en) * 1960-10-13 1968-06-27 Telefunken Patent Process for the production of hollow bodies from thermoplastic material by vortex sintering
WO1987002935A1 (en) * 1985-11-18 1987-05-21 Eastman Kodak Company Process for making optical recording media
WO1988001927A1 (en) * 1986-09-22 1988-03-24 Aleo Carmelo D Tire mold with traceless venting
WO1988003469A1 (en) * 1986-11-03 1988-05-19 Eagle-Picher Industries, Inc. Rotary molding machine with vacuum venting means
EP0591745A2 (en) * 1992-10-07 1994-04-13 Compagnie Generale Des Etablissements Michelin-Michelin & Cie Tyre mould and method for moulding tyres
EP0868955A1 (en) * 1997-01-29 1998-10-07 PIRELLI COORDINAMENTO PNEUMATICI S.p.A. Method of producing tyres, of making vulcanization moulds for said tyres, tyres and moulds thus produced

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1271379B (en) * 1960-10-13 1968-06-27 Telefunken Patent Process for the production of hollow bodies from thermoplastic material by vortex sintering
WO1987002935A1 (en) * 1985-11-18 1987-05-21 Eastman Kodak Company Process for making optical recording media
WO1988001927A1 (en) * 1986-09-22 1988-03-24 Aleo Carmelo D Tire mold with traceless venting
WO1988003469A1 (en) * 1986-11-03 1988-05-19 Eagle-Picher Industries, Inc. Rotary molding machine with vacuum venting means
EP0591745A2 (en) * 1992-10-07 1994-04-13 Compagnie Generale Des Etablissements Michelin-Michelin & Cie Tyre mould and method for moulding tyres
EP0591745A3 (en) * 1992-10-07 1994-10-12 Michelin & Cie Tyre mould and method for moulding tyres.
US5431873A (en) * 1992-10-07 1995-07-11 Compagnie Generale Des Etablissements Michelin - Micheline & Cie Tire mold and process for making the mold
EP0868955A1 (en) * 1997-01-29 1998-10-07 PIRELLI COORDINAMENTO PNEUMATICI S.p.A. Method of producing tyres, of making vulcanization moulds for said tyres, tyres and moulds thus produced

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