Oriented plastic container

Details Oriented plastic container Oriented plastic container

1981-05-18

1984-08-28

Price, William

Bottles and jars

Ejecting

Siphon type

264530, 264532, B29C 1707, B29F 500, B29C 506, B65D 2300

Patent

active

044679297

ABSTRACT:
A container (21), and a method and apparatus for producing the container from a tubular blank of polyethylene terephthalate or similar material, according to which a polyethylene terephthalate blank is stretched at least about 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 mould (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 mould (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: 2823421 (1958-02-01), Scarlett
patent: 3651186 (1972-03-01), Hall
patent: 3733309 (1973-05-01), Wyeth et al.
patent: 3900120 (1975-08-01), Sincock
patent: 3934743 (1976-01-01), McChesney et al.
patent: 4134510 (1979-01-01), Chang
patent: 4233022 (1980-11-01), Brady et al.

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