Process for producing concrete form made of thermoplastic resin

摘要

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