Method of and apparatus for making blown plastic articles

Details Method of and apparatus for making blown plastic articles Method of and apparatus for making blown plastic articles

B - Operations, Transporting

29

D

18/531

B29D 23/03 (1980.01)

Patent

CA 1041264

ABSTRACT OF THE DISCLOSURE The present invention provides a method and 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 and 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.

218070

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