Injection-moulding machine for thermoplastics

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 45/54 (2006.01)

Patent

CA 2194402

The invention concerns an injection-moulding machine for thermoplastics, the machine having at least one plastifier unit (10), at least one injection- moulding cylinder (11) with its associated discharge piston (18), and at least one mould (12). The injection-moulding cylinder (11) is fitted with a sleeve (16) which is disposed so that it can move back and forth between a position in which the connection to the mould is cut off and a position in which the connection to the mould is established. In the position in which no connection to the mould exists, there is a passage between the sleeve (16) and housing (14) which is connected to the feed channel (46) from the plastifier unit (10) and also to the storage space (27) inside the sleeve (16). The outside diameter of the discharge piston (18) is slightly smaller than the internal diameter of the sleeve (16) so that, between the two, there remains an annular gap through which the plastic can enter from one end (28) of the sleeve (16) into the storage space (27).

L'invention concerne une presse d'injection pour traiter des matières thermoplastiques, qui comprend au moins une unité de plastification (10), au moins un cylindre de moulage par injection (11) pourvu d'un piston de décharge (18) associé, ainsi qu'au moins un moule approprié (12). Le cylindre de moulage par injection (11) comporte un manchon (16) qui peut être déplacé en va-et-vient entre une position dans laquelle la communication avec le moule est interrompue, et une position dans laquelle la communication avec le moule est établie. Dans la position où la communication avec le moule est interrompue, il existe un passage entre le manchon (16) et le boîtier (14), qui est relié d'une part au canal d'alimentation (46) provenant de l'unité de plastification (10) et d'autre part à la chambre de stockage (27) délimitée à l'intérieur par le manchon. Le diamètre extérieur du piston de décharge (18) est légèrement inférieur au diamètre intérieur du manchon (16), de manière à ce qu'il subsiste entre les deux une fente annulaire que la matière plastique puisse traverser pour passer d'une extrémité (28) du manchon (16) dans la chambre de stockage (27).

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