US 4,047,860 A · Press mold for producing microcellular shaped pieces of dimensional accuracy, particularly shoe soles

Press mold for producing microcellular shaped pieces of dimensional accuracy, particularly shoe soles

AssigneesBor-, Cipo-, Szormeipari Kutato Intezet, Vseojuzny Nauchno-Issledovatelsky Institut Plenochnykh Materialov I Iskusstvennoi Kozhi

InventorsBoris Nisonovich Dinzburg, Jury Alexandrovich Smetkin, Vladimir Iosifovich Alexeenko, Vsevolod Andreevich Mikhailov, Ivan Lorant, Gyozo Seltenreich, Jeno Keszei, Gyorgy Marton, Albert Balazsfai, Jeno Donath, Erno Bolcskei

Life of this patent

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Abstract

Press molds for vulcanizing plastic materials comprise a pair of mold parts defining between them a mold cavity. One of the parts is a die and the other is a cover plate that defines with the die the mold cavity. A hot liquid is introduced into a lower portion of the mold cavity through the die and gas is removed from the upper portion of the mold cavity through the cover plate. As a result, both prevulcanization and after vulcanization can be achieved in one single press mold, by surrounding the material in the mold with hot liquid in the prevulcanization and then withdrawing the liquid when the molded material fills the die cavity in the second stage of vulcanization.

Claims1

Dependent claims

A press tool for vulcanizing plastic material, comprising a die, a cover plate forming with said die a molding chamber, said die having a flat bottom surface and said cover plate having a flat upper surface parallel to said bottom surface of said die, said die and cover plate having upright edges extending between said upper and lower surfaces, means for introducing a hot liquid through a said edge of said die into a lower portion of said chamber, and means to remove gas from an upper portion of the chamber through a said edge of said cover plate.

Dependencies are inferred from the claim text.

Facts

Application

05/553,152Filed 26 Feb 1975 · division

Priority

HU BO 121030 Dec 1969

Granted

13 Sep 1977

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

B29D 35/122
Producing parts thereof, e.g. soles, heels, uppers, by a moulding technique: soles
B29D 35/128
Producing parts thereof, e.g. soles, heels, uppers, by a moulding technique: moulds or apparatus therefor
B29C 35/00
Heating, cooling or curing
B29K 2021/00
Use of unspecified rubbers as moulding material