Device for making tubing foils

Details Device for making tubing foils Device for making tubing foils

1993-01-25

1994-10-11

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

425141, 4253261, 4253871, B29D 2322

Patent

active

053541901

ABSTRACT:
In order to make the thickness and strength values uniform in an extruded foil tubing made of high density polyethylene (HDPE), in the form of a long neck, an air nozzle ring is provided at the level of the end of the long neck in addition to an outer blow ring surrounding the ring nozzle of the blow head. The rate of air flow through the nozzles of the air nozzle ring is controlled dependent on a rotating measuring device for measuring the thickness of the foil which is located above the expansion portion of the foil tubing. The cooling effect of the outer blow ring is preferably twenty times greater than that of the air nozzle ring. To stabilize the foil bubble, an inner pin is provided at the level of the end of the long neck.

REFERENCES:
patent: 3568252 (1971-03-01), Masuda et al.
patent: 3709290 (1973-01-01), Upmeier
patent: 4112034 (1978-09-01), Nash et al.
patent: 4330501 (1982-05-01), Jones et al.
patent: 4606879 (1986-08-01), Cerisano
patent: 4624823 (1986-11-01), Audureau et al.
patent: 4626397 (1986-12-01), Bose
patent: 4818467 (1989-04-01), Audureau et al.
patent: 4938903 (1990-07-01), Schaeffer et al.

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