Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1987-03-02
1989-04-04
Lesmes, George F.
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
215 1C, 220453, B65D 9002
Patent
active
048185752
ABSTRACT:
The present invention is based on the finding that when a multi-layer blow-formed body is heat-treated, cooled and taken out, an intermediate layer of a gas-barrier resin in the multi-layer blow-formed body acts as a heat-insulating layer and if the blow-formed body is cooled from the interior by a cooling fluid, a shape-retaining property necessary for taking out the blow-formed body from the mold can be promptly obtained. A biaxially drawn polyester vessel excellent in the resistance to thermal contraction and gas-barrier properties can be prepared at a high manufacturing speed with a reduced number of steps by preheating or temeprature-adjusting a multi-layer preform comprising inner and outer layers of a polyester composed mainly of ethylene terephthalate units and at least one intermediate layer composed of a gas-barrier resin to a temperature suitable for drawing, carrying out the biaxial draw-blow forming of the preform and the heat treatment of the blow-formed body in a mold maintained at a heat-setting temperature, changing over a compressed fluid for the blow-forming to a fluid for internal cooling, cooling the blow-formed body to a temperature at which deformation is not caused when the blow-formed body is taken out from the mold, while contacting the blow-formed body with the surface of the mold cavity, and taking out the formed body from the mold.
REFERENCES:
patent: 4307137 (1981-12-01), Ota et al.
patent: 4528219 (1985-07-01), Yamada et al.
Hirata Sadao
Hirata Shunsaku
Nohara Shigezo
Lesmes George F.
Seidleck James J.
Toyo Seikan Kaisha Ltd.
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