Apparatus for making blown plastic articles

Details Apparatus for making blown plastic articles Apparatus for making blown plastic articles

1974-11-22

1976-02-24

Lazarus, Richard B.

Plastic article or earthenware shaping or treating: apparatus

Means treating shaped work

425DIG208, 425387B, B29D 2303

Patent

active

039402312

ABSTRACT:
The present invention provides an apparatus for thermally conditioning a blowable shape or parison, prior to blow molding, so that a subsequent blowing operation can be carried out under conditions conducive to bi-axial orientation in the final blown article.
More specifically, the parison is formed by conventional techniques, such as free extrusion or injection molding. The parison is then enclosed in a heat exchange chamber, having interior walls spaced substantially uniformly from the exterior of the parison, and the parison is exposed to a fluid heat transfer agent, so that the parison temperature is adjusted to that temperature at which the parison, upon expansion, will become bi-axially oriented. The fluid agent can either heat or cool the parison to the desired temperature.

REFERENCES:
patent: 2792593 (1957-05-01), Hardgrove, Jr.
patent: 3222725 (1965-12-01), Smith
patent: 3761550 (1973-09-01), Seefluth

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