Process and apparatus for the production of an extruded, stretch

Details Process and apparatus for the production of an extruded, stretch Process and apparatus for the production of an extruded, stretch

1988-08-26

1989-12-12

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

264568, 2642094, 2642095, 2642893, 425 71, 4253261, 425388, B29C 4790

Patent

active

048866342

ABSTRACT:
A seamless parison extruded from an extruder via an annular die, passes through a calibrator and coaxially surrounds a probe pipe, which is made to extend through the annular die beyond the calibrator. On the probe pipe there is mounted a sealing element. Ahead of the sealing element, a pressure equal to atmospheric pressure prevails inside the tube and, after the sealing element, a higher pressure than atmospheric pressure prevails. The pressurization is achieved in that a second belt take-off folds together the tube, so that the compressed air fed in through the probe pipe causes a higher tube internal pressure, since the sealing element bears in a sealing manner against the inside of the tube. As a result, a substantial pressure separation is effected at the point of the sealing element. In a first heating chamber, the tube is heated to the stretching temperature and is transported by a second belt take-off at a stretching speed, increased relative to the take-off speed of the first belt take-off, to a second heating chamber, in which a heat setting of the tube takes place. From the heating chamber, the tube is transported onward at the same, greater or lower speed than the stretching speed by a third belt take-off and wound up by a deflection roller onto a wind-up roller.

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patent: 4159889 (1979-07-01), Yagi et al.
patent: 4294796 (1981-10-01), Jack et al.
patent: 4443399 (1984-04-01), Takashige et al.

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