Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Production of continuous or running length
Patent
1980-06-30
1982-05-18
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Production of continuous or running length
264569, 425 72R, 4253261, 425379R, 526124, B29D 722
Patent
active
043305016
ABSTRACT:
A process and apparatus are disclosed for forming blown film of a low strain hardening polymer, such as a low pressure polymerized-low density ethylene copolymer, including an improved film bubble cooling technique which permits high production rates to be achieved with good film bubble stability. The disclosed process comprises cooling a molten film bubble by contacting the outside of the film bubble with separate annular streams of cooling fluid fed through at least two stacked annular cooling rings disposed around the film bubble, wherein all or substantially all of the cooling fluid exits the system through a common plane formed by the last cooling ring.
The disclosed apparatus comprises means for forming a molten film bubble and means for cooling same including at least two separate annular cooling rings disposed around the bubble, each provided with means for feeding an annular cooling fluid stream against the bubble and further including means whereby all or substantially all of said cooling fluid exits the system through a common plane formed by the last cooling ring.
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Jones David N.
Kurtz Stuart J.
Shedden John A.
Thurlow Jeffery R.
Union Carbide Corporation
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