Process for controlling the degree of orientation of tubular fil

Details Process for controlling the degree of orientation of tubular fil Process for controlling the degree of orientation of tubular fil

1992-06-01

1993-11-02

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 403, 264 405, 264 406, 264 407, 264564, 425140, 4253261, B29C 4792

Patent

active

052581489

ABSTRACT:
To determine and/or automatically control the degree of orientation of tubular films which have been made in a film-blowing plant including an extruder having a film-blowing head and apparatus for internal cooling and also including flattening and take-off apparatus, the rate of exchange of the air for internal cooling, the speed of the extruder, the temperature of the plastic composition being extruded and/or the take-off velocity are controlled. To ensure that the degree of orientation can be determined and/or automatically controlled in a simple manner and without an occurrence of trouble, that shape of the flaring portion of the bubble which corresponds to the desired degree of orientation is determined and/or adjusted and is recorded as the desired shape of the bubble. The actual shape of the flaring portion of the bubble is detected and compared with and adapted to the desired shape.

REFERENCES:
patent: 4036557 (1977-07-01), Christensen
patent: 4189288 (1980-02-01), Halter
patent: 4201741 (1985-05-01), Pannenbecker
patent: 4246212 (1981-01-01), Upmeier et al.
patent: 4402656 (1983-09-01), Schott, Jr.
patent: 4511530 (1985-04-01), Olsson et al.
patent: 4663097 (1987-05-01), Hatfield
patent: 4684487 (1987-08-01), Gawrisch
patent: 5096634 (1992-03-01), Tsadares et al.

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