Thermoplastic tube seal and cooling means

Details Thermoplastic tube seal and cooling means Thermoplastic tube seal and cooling means

1975-02-28

1977-02-15

Husar, Francis S.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

264 95, 425326R, 425387R, 425404, B29D 2304, B29F 308

Patent

active

040080226

ABSTRACT:
A cooling system for quenching extruded thermoplastic tubing which moves in a vertically upward direction from a die to a cooling mandrel comprises a seal means between the die and the mandrel and the introduction of cooling fluid such as water between the seal and the mandrel to flow upwardly as the tube passes along the mandrel. A water vapor atmosphere below the seal provides a controlled atmosphere leaking past the seal which condenses immediately upon passing the seal and coming into contact with the cooling fluid. This controlled atmosphere avoids air leakage past the seal and consequent imperfections in the thermoplastic material tube.

REFERENCES:
patent: 3426111 (1969-02-01), Simpson
patent: 3655846 (1972-04-01), Kanoh et al.
patent: 3709642 (1973-01-01), Stannard
patent: 3765808 (1973-10-01), Lyon et al.
patent: 3871802 (1975-03-01), Blackwelder
patent: 3891374 (1975-06-01), Ninomiya et al.

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