B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/760
B29C 47/90 (2006.01) B29C 33/20 (2006.01) B29C 33/36 (2006.01)
Patent
CA 1297649
Abstract of the Disclosure This invention relates to a method and an apparatus for the production of pipes. In the extrusion of plastic pipes, a circular mould cavity is formed of chill moulds (1, 2) which are semicircular in cross-section and the junction faces of which are pressed against each other. In order to keep the chill moulds tightly against each other, it is known to provide the edge area of the chill moulds (1, 2) with counter pieces (4) which have locking surfaces (5) whereon a press force is exerted by means of a rail of a U-shaped cross-section. In this known solu- tion, great friction forces are created between the locking surface (53 and the rail, and the diameter of the mould increases in a direction perpendicular to the junction faces. These disadvantages are avoided in the present invention wherein the apparatus comprises locking means (6) which follow the movement of the chill moulds (1, 2) and grip the locking surfaces (5) of the chill moulds. (Figure 4)
517997
Jarvenkyla Jyri
Sillanpaa Pauli
Cassan Maclean
Uponor N.v.
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