Method of forming strain crystallized thermoplastic articles

Details Method of forming strain crystallized thermoplastic articles Method of forming strain crystallized thermoplastic articles

1977-08-04

1979-03-13

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

264535, 425526, 425529, 425530, B29C 1707

Patent

active

041442989

ABSTRACT:
A method is disclosed for conditioning strain hardenable thermoplastic materials, such as polyethylene terephthalate, so that a highly developed strain crystallized morphology may be established during a blow molding operation. In the method, a thermoplastic parison is heated to a temperature in a range conducive to molecular orientation and then initially stretched at that temperature. Next, the stretched parison is cooled to a temperature slightly below glass transition temperature and stretched further at the reduced temperature. The combined stretching in these two separate phases is chosen to condition the material so that it is either on the verge of being strained hardened or has actually started strain hardening. Thereafter, the parison may be again heated to a temperature conducive to molecular orientation and blown; to a final article, with the resulting expansion of the material during the blowing operation achieving the desired strain crystallized morphology and strain hardening.

REFERENCES:
patent: 3733309 (1973-05-01), Wyeth et al.
patent: 4002709 (1977-01-01), Mozer
patent: 4042657 (1977-08-01), Ostapchenko et al.

Affiliated with

Also associated with

Rating

Method of forming strain crystallized thermoplastic articles 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 of forming strain crystallized thermoplastic articles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of forming strain crystallized thermoplastic articles will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2371584