Method of producing a container

Details Method of producing a container Method of producing a container

1982-11-23

1986-01-14

Silbaugh, Jan

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Stretching or stretch forming

264531, 264532, 264535, 264235, 264292, 264346, 425529, 425393, B29C 1702, B29C 1707

Patent

active

045644950

ABSTRACT:
A method of producing a container of polyethylene terephthalate or similar thermoplastic material from a tubular blank of amorphous material. A mechanical forming element moves a transitional zone between amorphous (thicker) material and thinner oriented material stretched to flow during simultaneous elongation of the blank in the direction of movement of the transitional zone. The stretched and oriented material is heated to a temperature higher than the temperature of the material immediately before stretching. As a result, the internal stresses produced in the material during earlier stretching are relieved. Heating causes the length of the material in the direction of stretching also to be reduced. Each subsequent forming stage for shaping the container takes place at a temperature lower than the temperature at the immediately preceding forming stage.

REFERENCES:
patent: 4108937 (1978-08-01), Martineu et al.
patent: 4405546 (1983-09-01), Jacobsen et al.
patent: 4409176 (1983-10-01), Jacobsen et al.

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