Apparatus for making multilayered blow molded articles

Details Apparatus for making multilayered blow molded articles Apparatus for making multilayered blow molded articles

1975-12-15

1977-09-13

Lazarus, Richard B.

Plastic article or earthenware shaping or treating: apparatus

Female mold and means to shape parison directly by internal...

Utilizing laminated parison

425529, 425533, B29D 2303

Patent

active

040478734

ABSTRACT:
A multilayered hollow article is formed by first injection molding the outer layer parison on a core rod and then forming a clearance between this first parison and the core rod in a second mold, followed by injection molding the inner layer parison through the inside of the core rod to the outside of the core rod and into intimate contact with the outer layer, and subsequently blow molding the formed two-layered parison in a blow mold to obtain the final configuration. This method and apparatus are particularly suitable to forming multilayered containers wherein the innermost layer is a barrier thermoplastic, such as polyvinylidene chloride, and wherein the dimensional integrity of the innermost layer must be maintained.

REFERENCES:
patent: 3002225 (1961-10-01), Goller
patent: 3621523 (1971-11-01), Dicks et al.
patent: 3709644 (1973-01-01), Farrell
patent: 3737259 (1973-06-01), Valyi
patent: 3836305 (1974-09-01), Grazine
patent: 3878282 (1975-04-01), Bonis et al.
patent: 3940231 (1976-02-01), Uhlig
patent: 3943219 (1976-03-01), Aoki
patent: 3947176 (1976-03-01), Rainville

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