Patent ID: 6457965
Filing Date: 2002-10-01
Classification: B29C,B29L

Abstract:
An apparatus for the manufacture of corrugated plastic pipes (23) with cross grooves (24),in which half shells (2,2â€²), which are provided with a mold recess (43) and combine in pairs to form a mold in a molding path (9) which runs in a direction of production (4). are disposed to circulate on a horizontal machine bed (1), which is provided with a cover plate (28) of antifriction metal; the half shells (2,2â€²) resting by their lower bearing surfaces (36) on the cover plate (28) and being pressed together transversely of the direction of production (4) by means of a guide (11,12); an extrusion head (25) of an extruder being disposed upstream of the molding path (9); the half shells (2,2â€²) being provided with vacuum ducts (41,57), which are connected to the respective mold recess (43) and which, in the molding path (9), open into vacuum connection (45) formed in the machine bed (1); and the half shells (2,2â€²) being provided with coolant lines (37,56), which, in the molding path (9), open into vacuum connections (45) formed in the machine bed (1); and the half shells (2,2â€²) being provided with coolant lines (37,56), which, in the molding path (9), open into coolant connections (48) and coolant outlets (49) formed in the machine bed (1), wherein each half shell (2,2â€²) has a core (30,30â€²,52,30â€³), which consists of a metal of higher thermal conductivity and a lower specific gravity than steel, in which the mold recess (43) is formed, in which the vacuum ducts (41,57) are formed at least substantially, and which is sheathed at least in the shape of an L by a base body (29, 29â€², 54, 29â€³) of steel, on which the bearing surface (36) is formed and on which rests the guide (11,12).