Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1989-01-17
1990-09-18
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
2643288, 425130, B29C 4516
Patent
active
049576828
ABSTRACT:
A method for manufacturing a three-layered container by injection molding, the method consecutively including steps of: (a) preparing an injection molding apparatus having: an inner injector element having a tubular inner body and a flow path communicating with the inner inlet nozzle and an inner injection nozzle formed both ends of the body, respectively; and an outer injector element having a tubular outer body including an outer injection nozzle and an outer inlet nozzle, the outer injector element disposed to hold the inner injector element so that a tubular space is formed between the inner and the outer bodies, the inlet nozzle of the outer body communicating with a curved groove formed in the outer surface of the inner injector body; and the inner surface of the outer body and the outer surface of the inner body are in a form so that the thickness of the tubular space therebetween is smaller at a portion compared to other portions; (b) injecting a first resin from the outer injection nozzle; (c) injecting a second resin from the inner injection nozzle 0.0001-3.0 seconds after the end of the preceding step of injecting the first resin; and (d) injecting the first resin from the outer injection nozzle, 0.0001-1.0 second after the start of the precedent injecting the second resin.
REFERENCES:
patent: 4459257 (1984-07-01), Baciu
patent: 4548569 (1985-10-01), Pitigliano et al.
patent: 4774047 (1988-09-01), Nakamura et al.
Inakazu Nobuhiro
Kobayashi Hidenori
Nagamatsu Hatsuo
Suwabe Moriaki
Heitbrink Jill L.
Kamaya Kagaku Kogyo Co., Ltd.
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