Injection type molding machine for producing hollow double wall

Details Injection type molding machine for producing hollow double wall Injection type molding machine for producing hollow double wall

1993-01-19

1993-12-28

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

Means providing a shaping orifice

Adjustable shaping orifice or shape imparting insert member

425467, 425532, 425533, 425557, B29C 4906

Patent

active

052734218

ABSTRACT:
An improved injection blow molding machine has an melt accumulator or melt metering chamber and a vertically extending oval type die communicating therewith for injecting an elliptical annular parison through the die, which is to be blow molded to produce a hollow double wall type article. The oval type die includes a die housing and a mandrel mounted therein to define a melt passage therebetween having a die lip or opening of a four sided elliptical annular profile at a free lower end of the die. The accumulator is in direct contact with the mandrel, and/or the die housing is enlarged in a horizontal direction at a lower end portion thereof. Preferably the enlarged lower end portion is formed by a plate part fixed to a block part forming an upper portion of the die housing. More preferably, the plate part is fixed to the block part in a vertical direction but is allowed to horizontally move to some extent, and is provided with plural pairs of bolts and nuts for adjusting the die lip in a horizontal width direction with the each pair of opposite bolts being fixed to opposite margin portions of the plate part and biasing the block part against each other.

REFERENCES:
patent: 3317955 (1967-05-01), Schurman et al.
patent: 4185954 (1980-01-01), Murakami et al.
patent: 4201534 (1980-05-01), Phipps
patent: 4298325 (1981-11-01), Cole
patent: 4798528 (1989-01-01), Hattori et al.

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