Method for producing a tubular object of polyethylene terephthal

Details Method for producing a tubular object of polyethylene terephthal Method for producing a tubular object of polyethylene terephthal

1981-05-18

1983-09-20

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Dividing work to form plural articles

264527, 264532, 264291, 264296, 425393, B29C 1702, B29C 1714

Patent

active

044055463

ABSTRACT:
An object is produced from a tubular blank (10,15,17) of thermoplastic material of polyester or polyamide, preferably of polyethylene terephthalate by reducing the thickness of amorphous material in one or several areas of the blank by means of one or several consecutive re-shaping operations. A mechanical shaping device (23,29,71,81) moves a transitional zone (13,14,113) situated between thicker and thinner material along the blank and simultaneously elongates the blank in the moving direction of the transitional zone while reducing the thickness. After the last re-shaping operation the thinner material preferably has an oriented state. During the re-shaping operation the temperature of the material in the transitional zone (13,14,113) is controlled at a level which, immediately before the re-shaping operation, is within or close to the range of the glass transition temperature (TG). In one embodiment the reduction of the wall thickness of the material is begun in a track (12) in the wall of the blank and continues symmetrically around the track. Clamping devices (41,51,61) are used to maintain the axial position of the blank. The blank is suitable for re-shaping, for instance, into a container in which the mouth also consists of oriented material.

REFERENCES:
patent: 2338210 (1944-01-01), Snyder
patent: 3205289 (1965-09-01), Carpenter
patent: 3757718 (1973-09-01), Johnson
patent: 4198370 (1980-04-01), Suzuki
patent: 4212204 (1980-07-01), St. Amand

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