Process for producing concrete form made of thermoplastic resin

Details Process for producing concrete form made of thermoplastic resin Process for producing concrete form made of thermoplastic resin

1994-04-28

1996-06-11

Sweet, Mark D.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

2643287, B27N 318

Patent

active

055252850

ABSTRACT:
A process for producing a concrete form made of thermoplastic resin by a press-molding process by feeding a reinforcing material-containing thermoplastic resin heated to a temperature not lower than the melting temperature of the resin into the cavity between male and female halves of a die, clamping the die and cooling the die, wherein the press-molding is carried out under the conditions that the period of time from completion of feeding the melted resin to completion of clamping is not longer than 6 seconds and flow length L of the fed resin and thickness T of the molded product satisfy the formula 190.ltoreq.L/T.

REFERENCES:
patent: 3891179 (1975-06-01), Berman
patent: 4409169 (1983-10-01), Bartholdsten et al.
patent: 5034076 (1991-07-01), Masui et al.
patent: 5252269 (1993-10-01), Hara et al.
patent: 5275776 (1994-01-01), Hara et al.
patent: 5336463 (1994-08-01), Hara et al.
Patent Abstracts of Japan, vol 11. No. 327 (M-635), Oct. 24, 1987 & JP-A-62 109 618.
Patent Abstracts of Japan, vol. 14, No. 140 (M-950) (4083), Mar. 16, 1990 & JP-A-02 008 459.

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