Injection moulding machine

Details Injection moulding machine Injection moulding machine

B - Operations, Transporting

29

C

B29C 45/67 (2006.01)

Patent

CA 2294926

The invention relates to a two-platen injection moulding machine, comprising a fixed platen (2) supporting one mould half (1) and a moving platen (4) supporting the other mould half (3). Plunger-column units (5- 8) which pass through the fixed platen (2) and which are displaceably guided therein in plunger-cylinder units (9-12) are attached. The connecting channels (25-27) between the plunger-column units (5-8) are blocked off after the two mould halves have been closed and before the plastic melt is injected into the mould cavity (36) encompassed by the mould halves in order to keep the locking force essentially evenly distributed across the mould parting surface in the presence of the asymmetrically effective mould opening forces.

L'invention concerne une machine de moulage par injection à deux plateaux, comportant un plateau de fixation de moule fixe (2) portant une moitié de moule (1), et un plateau de fixation de moule mobile (4) portant l'autre moitié de moule (3). Dans cette machine de moulage par injection sont fixés des ensembles pistons-colonnes (5,-8) qui traversent le plateau de fixation de moule fixe (2) et qui y sont guidés de manière déplaçable dans des ensembles pistons-cylindres (9-12). Dans le but de répartir pratiquement uniformément la force de fermeture sur les plans de joint du moule (37, 38) lorsque s'exercent des forces asymétriques de soulèvement du moule, les canaux de jonction (25-27) entre les ensembles pistons-cylindres (9-12) sont obturés après la fermeture des deux moitiés de moule et avant l'injection du plastique en fusion dans la cavité de moule (36) formée par les deux moitiés de moule.

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