moulage par injection
- Domaine
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- matière plastiquemoulage des plastiques
- Dernière mise à jour
Définition :
Procédé de moulage par lequel une matière plastique ramollie par la chaleur est forcée sous pression, à travers un cylindre de plastification, dans l'empreinte d'un moule fermé.
Note :
Le moulage par injection est la méthode la plus courante pour la transformation des matières thermoplastiques. Presque 25 % de ces matières sont moulées par injection. À l'heure actuelle, il est possible d'appliquer cette technique à la transformation des matières thermodurcissables.
Terme privilégié :
- moulage par injection n. m.
Traductions
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anglais
Auteur : Office québécois de la langue française,Note :
((Injection moulding is)) the method of forming objects from granular or powdered plastics, most often of the thermoplastic type, in which the material is fed from a hopper to a heated chamber in which it is softened, after which a ram or screw forces the material into a mould. Pressure is maintained until the mass has hardened sufficiently for removal from the mould. In a variation called flow moulding, additional molten material is forced into the mould during cooling of the initial charge to overcome shrinkage. Machines employing screws for forcing the material through the plasticating zone (for the process called screw plasticating injection moulding) are either single stage or double stage. In single stage machines, plastication and injection are done in the same cylinder, the injection pressure being attained by a forward motion of the screw. This process is called reciprocating screw injection moulding. In double stage machines, the material is plasticated by the screw and then is delivered to an accumulator chamber through a check valve, from which it is injected into the mould by a piston. This process is called screw-piston injection moulding.
Termes :
- injection moulding Royaume-Uni
- injection molding États-Unis