Process and device for manufacturing plastic mouldings

Details Process and device for manufacturing plastic mouldings Process and device for manufacturing plastic mouldings

B - Operations, Transporting

29

C

B29C 37/00 (2006.01) B29C 44/04 (2006.01) B29C 44/10 (2006.01) B29C 45/17 (2006.01) B29C 67/22 (1990.01)

Patent

CA 2083944

ABSTRACT In a process for manufacturing plastic mouldings from a reactive foam material such as polyurethane, at least two liquid reactants are mixed while incorporating finely dispersed air, and the resultant reaction mixture is injected through a gate into an assembled cavity of a mould, displacing the air in the latter and causing a build up in internal pressure in the mould which decreases as the distance from the gate increases, and hardens by chemical reaction in the cavity to form a moulding. To improve the mechanical properties of prefabricated parts and to smooth the surface pores, the internal pressure in the mould in at least one region, preferably remote from the gate, already filled with reaction mixture is increased shortly after the end of injection and the reaction mixture, which is in a gel-like transition state, is compacted, the air inclusions being compressed and/or released.

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