Process for cooling a tubular sleeve of thermoplastic material a

Details Process for cooling a tubular sleeve of thermoplastic material a Process for cooling a tubular sleeve of thermoplastic material a

1987-03-27

1989-04-04

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

264569, 425 721, 4253261, B29C 4788

Patent

active

048184675

ABSTRACT:
Process and device for cooling a tubular sleeve produced by hot extrusion-blowing of a thermoplastic material through an annular die. In the process, a stream of primary air is flowed under pressure substantially parallel to and spaced from the tubular sleeve and reaches the tubular sleeve at a second stage. The stream of primary air induces a stream of secondary air which flows substantially parallel and proximate to the tubular sleeve at a first stage and whose flow is substantially laminar over most of its path. The device includes a first cylindrical sleeve member that, in combination with the tubular sleeve, defines a secondary air flow space. A second cyclindrical sleeve member and the first sleeve member define a primary air flow space therebetween. A cylindrical ring disposed proximate to the annular die directs air into the secondary air flow space. A source of pressurized air is in flow communication with the primary air flow space.

REFERENCES:
patent: 3307218 (1967-03-01), Reifenhauser
patent: 3548042 (1970-12-01), Hinrichs
patent: 4272231 (1981-06-01), Schott, Jr.
patent: 4447387 (1984-05-01), Blakeslee et al.
patent: 4472343 (1984-09-01), Kawamura et al.
patent: 4505657 (1985-03-01), Ikeya
patent: 4624823 (1986-11-01), Audureau et al.
patent: 4626397 (1986-12-01), Bose
patent: 4632801 (1986-12-01), Dowd

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