Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Plural sequential shaping or molding steps on same workpiece
Patent
1982-12-16
1984-12-18
Czaja, Donald
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Plural sequential shaping or molding steps on same workpiece
264319, 264325, B29C 300
Patent
active
044890311
ABSTRACT:
A method for molding plastic materials which release gas during molding by operating a mechanical rotary crank type press having opposed metal die parts respectively carried on a slide driven by a crank mechanism and on a floating plate supported on a die cushion and movable against a bolster on the press. The method involves heating a blank of a plastic material which releases gas during molding to a molding temperature and placing it between the die parts. Then, the crank mechanism of the press is operated to drive the slide in a direction toward a bottom dead center position to a first position which is within a range of positions in the movement of the slide where only the reacting force of the die cushion is received by the blank and holding the slide at this first position for a time up to several seconds for permitting release of the gas from the plastic material of the blank. Then the crank mechanism of the press is further operated to drive the slide to the position thereof corresponding to the bottom dead center position of the crank mechanism for exerting pressure on the blank against the bolster of the press. Finally the slide is driven past the last mentioned position and in the opposite direction to a further position where only the reaction force of the die cushion is received by the blank and holding the blank at this further position for cooling and solidifying the blank.
REFERENCES:
patent: 2485452 (1949-10-01), Lyijynen
patent: 2841826 (1958-07-01), Brucker
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patent: 3809736 (1974-05-01), Munk
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patent: 4014970 (1977-03-01), Jahnle
patent: 4327049 (1982-04-01), Miller
Processing of Plastic Products, pp. 87-89, published in U.S.S.R. (Moscow, 1966), Translation provided.
Czaja Donald
Fischbach V.
Ogihara Susumu
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