Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Stretching or stretch forming
Patent
1983-12-09
1986-12-23
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Stretching or stretch forming
264296, 425393, B29C 5500
Patent
active
046311637
ABSTRACT:
An object is produced from a tubular blank (10,15,17) of thermoplastic material of the type 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 single 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 elongates simultaneously the blank in the moving direction of the transitional zone. After the last re-shaping operation the thinner material has preferably 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 too consists of oriented material. The invention offers possibilities for materials savings by comparison with previously used methods, at the same time as the thermal and mechanical characteristics of the container are improved.
REFERENCES:
patent: 1886935 (1932-11-01), Bohle
patent: 2249510 (1941-07-01), Welker
patent: 2338210 (1944-01-01), Snyder
patent: 3205289 (1965-09-01), Carpenter
patent: 3651186 (1972-03-01), Hall
patent: 3757718 (1973-09-01), Johnson
patent: 3806301 (1974-04-01), Osterhagen et al.
patent: 4028037 (1977-06-01), Dawson
patent: 4108937 (1978-08-01), Martineu
patent: 4131407 (1978-12-01), dePutter et al.
patent: 4198370 (1980-04-01), Suzuki
patent: 4212204 (1980-07-01), St Amand
patent: 4250138 (1981-02-01), Okita
patent: 4260567 (1981-04-01), Poppe et al.
Jakobsen Kjell M.
Nilsson Claes T.
Fortenberry J.
PLM AB
Woo Jay H.
LandOfFree
Method for producing a tubular object of polyethylene terephalat does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for producing a tubular object of polyethylene terephalat, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for producing a tubular object of polyethylene terephalat will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-171004