Extrusion molding process and the related apparatus

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 49/04 (2006.01) B21C 23/08 (2006.01) B21C 23/14 (2006.01) B21C 25/00 (2006.01) B29C 49/14 (2006.01) B29C 49/46 (2006.01) B29C 49/48 (2006.01) B29C 49/56 (2006.01) B29C 49/62 (2006.01)

Patent

CA 2294015

An extrusion molding process including the steps of: i) extruding a material through an extruding die (1) into a tubular molding (5), ii) driving two clamping devices (4) to clamp the tubular molding (5) at different elevations, causing an air-tight space to be formed within the tubular molding, iii) closing two symmetrical halves of a molding die (3) on the tubular molding (5) between the clamping devices (4) and simultaneously lowering one clamping device (4) to stretch the tubular molding downwards, causing the tubular molding to be compressed in a die cavity (31) between the two symmetrical halves of the molding die (3) and molded into the desired finished product; and iv) opening the molding die (3) to remove the finished product and returning the clamping devices (4) to their former positions.

Cette invention se rapporte à un procédé de moulage par extrusion comprenant les étapes suivantes: (i) extrusion de matière par une filière (1) assurant la formation d'une pièce moulée tubulaire (5), (ii) actionnement de deux dispositifs de serrage (4) permettant de bloquer la pièce moulée tubulaire (5) à différentes hauteurs, ce qui assure la formation d'un espace étanche à l'air au sein de ladite pièce moulée tubulaire, (iii) fermeture de deux moitiés symétriques d'une filière de moulage (3) sur la pièce moulée tubulaire (5) entre les dispositifs de serrage (4) et abaissement simultané d'un dispositif de serrage (4) de façon à étirer la pièce moulée tubulaire vers le bas, ce qui provoque la compression de la pièce moulée tubulaire dans une cavité (31) de filière entre les deux moitiés symétriques de la filière de moulage (3) et son moulage en un produit fini souhaité; et (iv) ouverture de la filière de moulage (3) permettant de retirer le produit fini et retour des dispositifs de serrage (4) à leur position initiale.

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