Injector

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 45/48 (2006.01)

Patent

CA 2708891

An object is to reduce the axial dimension of an injection apparatus (31), facilitate the work of removing and inserting a screw (20), and improve the quality of molded products. The injection apparatus (31) comprises a heating cylinder (17), a screw (20), and a drive apparatus. The screw (20) includes a plasticizing portion which includes a body portion (45a) and a flight (53) projectingly formed on an outer circumferential surface of the body portion (45a). An index c, which is obtained by dividing a value obtained by adding a screw stroke S and a screw effective length L together by the screw stroke S, satisfies the relation 2.0 < .epsilon. < 4.5. Even when the screw (20) is shortened, resin can be melted satisfactorily. Accordingly, the axial dimension of the injection apparatus (31) can be reduced.

La dimension axiale d'un injecteur (31) est diminuée, le travail d'insertion/retrait d'une vis (20) est facilité, et les qualités d'un moulage sont améliorées. L'injecteur comporte un cylindre chauffant (17), la vis (20), et un dispositif d'entraînement. La vis (20) comporte une partie de corps principale (45a), et une partie de plastification pourvue de déflecteurs (53) formés pour dépasser de la surface circonférentielle extérieure de la partie de corps principale (45a). En supposant que la course de vis soit S, que la longueur effective de la vis soit L, et qu'une valeur obtenue en divisant la somme de la course S de la vis et de la longueur effective L de la vis par la course S de la vis soit un indice e, l'indice e est établi pour répondre à une relation 2,0<e<4,5. Même si la vis (20) est raccourcie, la résine peut bien fondre. En conséquence, la dimension axiale de l'injecteur (31) est diminuée.

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