Method of forming blown polyethylene terephthalate containers

Details Method of forming blown polyethylene terephthalate containers Method of forming blown polyethylene terephthalate containers

1979-01-11

1980-11-11

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Labeling or embossing indicia

264526, 264529, 264532, B29C 1707

Patent

active

042332621

ABSTRACT:
A method is disclosed for blow molding polyethylene terephthalate preforms, such as injection molded parisons, to achieve exterior surface indentations on blown containers without using profiled mold cavity walls. In the method, a profile is molded or otherwise formed in the exterior wall of the preform, defining a preform wall portion having sections of different thicknesses. Then, the preform is blow molded under conditions so that the polyethylene terephthalate material strain hardens in order to cause the different wall thicknesses to expand and stretch proportionately. As a result, the blown containers formed by this method include a surface contour which is essentially proportionately shaped to the surface profile formed on the pre-existing preforms.

REFERENCES:
patent: 3754851 (1973-08-01), Reilly et al.
patent: 3956441 (1976-05-01), Unlig
patent: 4042657 (1977-08-01), Ostapchenko et al.

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