B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 44/34 (2006.01) B29C 45/17 (2006.01) B29C 45/52 (2006.01)
Patent
CA 2285934
The cylinder head (8) of an injection moulding machine has a transverse bore (20), in which is threadedly engaged a gas introduction device (21) connected to a gas bottle (22), having a pressure regulator (23). The device has a body (24) which carries a valve poppet (25) in a complementarily shaped bore (26) opening to the passage through the cylinder head. A spring (27) normally closes the poppet valve. A control valve (28), under control of the system (7) is provided upstream of the poppet valve. Gas is introduced into the injection chamber of the machine after suck tack and before screw rotate for feeding plastics material to the injection chamber. On injection, the material is injected with the gas added to it.
La tête de cylindre (8) d'une machine de moulage par injection comprend un alésage transversal (20) dans lequel est engagé, dans un filetage, un dispositif d'introduction de gaz (21) raccordé à une bouteille de service (22) muni d'un régulateur de pression (23). Le dispositif comprend un corps (24) portant un champignon de clapet (25) dans un alésage complémentaire (26) qui donne sur le conduit transversal de la tête de cylindre. Un ressort (27) ferme généralement le champignon de clapet (25). Une vanne de régulation (28) commandée par le système (7) est disposée en amont du champignon de clapet. On introduit le gaz dans la chambre d'injection de la machine après repompage et avant que la vis ne soit mise en marche pour alimenter la chambre d'injection avec de la matière plastique. Le gaz est ajouté à ladite matière au moment de l'injection.
Coraltech Limited
Dennison Associates
LandOfFree
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