Preparation of multi-layer drawn polyester bottles

Details Preparation of multi-layer drawn polyester bottles Preparation of multi-layer drawn polyester bottles

1988-11-18

1992-02-04

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264532, 264533, 264535, 264150, 264173, 264296, 425462, 425532, B29C 4922

Patent

active

050858211

ABSTRACT:
A multi-layer drawn polyester bottle has a neck portion having an opening on the top end and a fitted or screwed part on the periphery, a bottom portion formed by fusion bonding and closing of a pipe and a barrel portion biaxially molecularly oriented by draw-blowing of the pipe. The pipe is composed of a co-extrudate of inner and outer surface base layers of polyethylene terephthalate and an intermediate layer of an ethylene-vinyl alcohol copolymer having an ethylene content lower than 50 mole %. This multi-layer drawn polyester bottle is prepared by co-extrusion a multi-layer pipe using the coextrudate and, if necessary, interposing an adhesive layer between the two resin layers, cutting the pipe into a predetermined length, closing one end of the cut pipe by fusion bonding to form a bottom portion, forming the other end of the cut pipe into a neck portion having an opening on the top end and a fitted or screwed part on the periphery, pre-heating the so-obtained preform at a drawing temperature of 85.degree. to 120.degree. C. and subjecting the preform to draw-blow-forming biaxially in the axial direction and circumferential direction in a blow-forming mold.

REFERENCES:
patent: 3821349 (1974-06-01), Mozer
patent: 4217161 (1980-08-01), Yamada et al.
patent: 4261473 (1981-04-01), Yamada et al.
patent: 4424182 (1984-01-01), Cerny
patent: 4649004 (1987-03-01), Nohara et al.
patent: 4816304 (1989-03-01), Nohara et al.

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