Manufacture of articles by drawing

Details Manufacture of articles by drawing Manufacture of articles by drawing

1980-05-30

1983-02-08

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Stretching or stretch forming

264296, B29C 1703

Patent

active

043729088

ABSTRACT:
A process for the manufacture of articles from a thermoplastic of polyester or polyamide type, preferably of polyethylene terephthalate, the articles being manufactured from elements which consist of an edge part which surrounds a body in an arrangement in which the latter is sunk relative to the edge part. The element is formed from a blank of mainly amorphous material or from a material having a crystallinity of less than 10%. The blank consists, for example, of a flat plate, a blank shell or the like. The body or parts thereof are shaped by stretching the blank until that material flows which is located within the material sections of the blank, which form the edge part in the element, the material stretched up to flowing in the body assuming a crystallinity of between 10 and 25%, while the crystallinity in the material in the edge part and in the unstretched parts retains its original value of less than 10%. The edge part is severed from the body which is elongated in the axial direction by a number of stretching steps, while the stretching at right angles to the direction of drawing is reduced at the same time.

REFERENCES:
patent: 3184524 (1965-05-01), Whiteford
patent: 3420930 (1969-01-01), Lurie
patent: 3496143 (1970-02-01), Siggel et al.
patent: 3733309 (1973-05-01), Wyeth et al.
patent: 3757718 (1973-09-01), Johnson
patent: 3814784 (1974-06-01), Wolf

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