Plastic article or earthenware shaping or treating: apparatus – Female mold and means to shape parison directly by internal... – With heating or cooling means
Patent
1985-05-06
1987-10-20
Silbaugh, Jan H.
Plastic article or earthenware shaping or treating: apparatus
Female mold and means to shape parison directly by internal...
With heating or cooling means
425525, 425529, 425535, 264520, 264521, 264531, 264532, 264534, B29C 4900, B29C 4912, B29C 4930, B29C 4948
Patent
active
047011211
ABSTRACT:
Apparatus 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.
REFERENCES:
patent: 3651186 (1968-03-01), Hall
patent: 3949034 (1976-04-01), Unlig
patent: 4035455 (1977-07-01), Rosenkranz et al.
patent: 4177239 (1979-12-01), Gittner et al.
patent: 4233022 (1980-11-01), Brady et al.
patent: 4318882 (1982-03-01), Agrawal et al.
patent: 4405546 (1983-09-01), Jakobsen
Research Disclosure, "In-Molding Annealing", Mar. 1975, pp. 58 and 59.
Jakobsen Kjell M.
Nilsson Claes T.
McCarthy Neil M.
PLM AB
Silbaugh Jan H.
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