Process for the manufacture of PET containers designed to be fil

Details Process for the manufacture of PET containers designed to be fil Process for the manufacture of PET containers designed to be fil

1990-06-28

1992-09-08

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Differential temperature conditioning

264526, 264529, 264532, 264535, 425526, 425529, 425530, B29C 4918

Patent

active

051456320

ABSTRACT:
A process for the manufacture of a polyethylene terephthalate (PET) container from a hollow amorphous PET preform which includes an open end and a closed end, the open end forming a neck section having dimensions already conformed to its final size and shape, the container being able to withstand relatively severe thermal conditions encountered when the container is filled with a hot liquid, without appreciable deformation, including the steps of: a) rapidly heating only the body of the PET preform, exclusive of the neck section, to a temperature at which subsequent longitudinal and transverse stretching cause no stresses in the PET; b) transferring the hot preform from step (a) to a mold whose walls are maintained at a temperature lower than the temperature of the hot preform body; c) longitudinally stretching the preform body while simultaneously transversely expanding it by blow-molding using a pressurized fluid so as to mold the preform body to the shape of the mold cavity; d) rapidly evacuating the pressurized fluid from the molded container of step (c); and e) removing the container from the mold.

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Ringwald, E. L., Polymer Handbook, "Physical Constants of Poly(Ethylene Terephthalate)" Brandrup-Immergut (Jun. 1967).
Vieth, Wolf R., "Orientation Factors Affecting the CO.sub.2 Permeability of PET," Business & Technical Papers, Mar. 17-19, 1981, at the 5th Annual International Conference on Oriented Plastic Containers.

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