Biaxially oriented container of thermoplastics material

Details Biaxially oriented container of thermoplastics material Biaxially oriented container of thermoplastics material

B - Operations, Transporting

65

D

190/26.1

B65D 1/02 (2006.01) B29C 31/00 (2006.01) B29C 49/14 (2006.01) B29C 49/22 (2006.01) B29C 49/54 (2006.01) B29C 55/30 (2006.01) B29C 59/04 (2006.01) B29C 67/00 (2006.01)

Patent

CA 1192851

Abstract of the Disclosure A container made from a tubular blank of polyethylene terephthalate or similar material, according to which the polyethylene terephthalate blank is stretched at least approximately 3-fold to produce a preform. 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 is heated to a temperature above the glass transition temperature (TG) and is converted to the container in a blowmould. In doing so, the contour length of the material is maintained through successive reduction of the axial length of the body which the preform constitutes during the conver- sion to the container, In order to achieve this, the base portion of the blowmould is moved towards the orifice of the final container. The container acquires a neck portion and a container body which are axially oriented, in the case of polyethylene terephthalate to an extent corresponding to an about 3-fold monoaxial stretching, whilst the container body is also trans- versely oriented, in the case of polyethylene tereph- thalate to an extent corresponding to an about 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.

378493

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