Method of blow-molding biaxially oriented polyethylene terephtha

Details Method of blow-molding biaxially oriented polyethylene terephtha Method of blow-molding biaxially oriented polyethylene terephtha

1995-06-07

1996-04-23

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Differential temperature conditioning

264530, 264906, 425526, B29C 4918, B29C 4964

Patent

active

055100791

ABSTRACT:
A method of blow-molding a biaxially-oriented polyethylene terephthalate resin bottle-shaped container having high heat resistance and substantially no residual stress is disclosed. The method comprises the steps of: providing a preform with a neck and a body; heating the preform to an orienting temperature; first biaxial-orientation blow-molding the preform in a first mold which is at a first temperature to biaxially stretch the preform to form a primary intermediate molded bottle-shaped piece that is larger than the bottle-shaped container and having an area magnification of at least 5 times the preform, the biaxial stretching creating residual stress in the primary intermediate molded bottle-shaped piece; causing thermal contraction of the primary intermediate molded bottle-shaped piece by heating the primary intermediate molded bottle-shaped piece to a temperature higher than the first temperature to form a secondary intermediate molded bottle-shaped piece and to eliminate residual stress caused by the first blow-molding; and second blow-molding the secondary intermediate molded bottle-shaped piece in a second mold to form the bottle-shaped container, wherein orientation magnification of the secondary intermediate molded bottle-shaped piece is small compared to orientation magnification of the primary intermediate molded bottle-shaped piece and substantially no stress is created during the second blow-molding.

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