Longitudinal stretch apparatus in blow molding

Details Longitudinal stretch apparatus in blow molding Longitudinal stretch apparatus in blow molding

B - Operations, Transporting

29

C

18/535

B29C 49/44 (2006.01) B29C 49/12 (2006.01) B29C 43/12 (2006.01)

Patent

CA 1064662

ABSTRACT OF THE DISCLOSURE This injection blow molding machine has special pro- vision for maintaining the plastic of a parsion on a core rod at the orientation temperature of the plastic; and stretch- ing the plastic of the parison lengthwise of the core rod for orientation in the direction of one axis without any substantial increase in the diameter of the parison. After this orientation in one axis, the temperature is controlled to maintain an orientation temperature, and the plastic of the parison is then blown to a larger diameter so as to ob- tain orientation in another axis for "bi-axial orientation". The core rod is covered by an elastic balloon, and prevision is made for obtaining floe of the plastic on the core rod lengthwise of the rod during the first orientation operation.

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