Method for controlling crystallization in thermoplastic material

Details Method for controlling crystallization in thermoplastic material Method for controlling crystallization in thermoplastic material

1977-08-22

1979-04-17

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...

264328, 264331, 264570, B29C 1707, B29F 106

Patent

active

041500792

ABSTRACT:
A method and apparatus are disclosed for controlling crystallization in thermoplastic materials, such as polyethylene terephthalate, which crystallize when cooled from melt temperature to below glass transition temperature after being injected into a mold cavity. When greater amounts of crystallization are desired, a very high pressure is initially imposed upon the material as it cools from the melt temperature, and then the pressure is reduced proportionally to the reduction in temperature so that a nominal pressure is imposed upon the material at glass transition temperature. When a significantly lesser amount of crystallization is desired, an initial nominal pressure is imposed upon the material as it cools from the melt temperature to a predetermined temperature, at which time the pressure is drastically increased.

REFERENCES:
patent: 2617150 (1952-11-01), Rubin
patent: 3822332 (1974-07-01), Hrach et al.
patent: 3849530 (1974-11-01), Wyeth et al.

Affiliated with

Also associated with

Rating

Method for controlling crystallization in thermoplastic material 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 controlling crystallization in thermoplastic material, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for controlling crystallization in thermoplastic material will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1261780