Method of producing a biaxially oriented container of polyethyle

Details Method of producing a biaxially oriented container of polyethyle Method of producing a biaxially oriented container of polyethyle

1983-04-29

1985-09-10

Silbaugh, Jan

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

264531, 264534, 264535, 425526, 425529, B29C 1707

Patent

active

045405441

ABSTRACT:
A method for producing a container from a tubular blank of polyethylene terephthalate or similar material, according to which a polyethylene terephthalate blank is stretched at least approximately 3-fold to produce a preform (20). In an axial section through the preform, the contour length substantially corresponds to the contour length in an axial section through the final container. The preform (20) is heated to a temperature above the glass transition temperature (TG) and is converted to the container (21) in a blow mold (12). In doing so, the contour length of the material is maintained through successive reduction of the axial length of the body (23) which the preform constitutes during the conversion to the container. In order to achieve this, the base portion of the blow mold (11) is moved towards the orifice (22) of the final container. The container acquires a neck portion (23) and a container body (26) which are axially oriented, in the case of polyethylene terephthalate to an extent corresponding to about a 3-fold monoaxial stretching, while the container body (26) is also transversely oriented, in the case of polyethylene terephthalate to an extent corresponding to about a 3-fold stretching as a maximum. The wall thickness of the container is inversely proportional to the radius of the container. The container is dimensionally very stable and has excellent strength characteristics.

REFERENCES:
patent: 3651186 (1968-03-01), Hall
patent: 3949034 (1976-04-01), Uhlig
patent: 4177239 (1979-12-01), Gittner et al.
patent: 4409176 (1983-10-01), Jakobsen et al.

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