Internal deckle for film extrusion dies

Details Internal deckle for film extrusion dies Internal deckle for film extrusion dies

1998-02-24

2000-08-22

Pyon, Harold

Plastic article or earthenware shaping or treating: apparatus

Stock pressurizing means operably associated with downstream...

Centripetal elastic melt extruder type

425466, B29C 4716

Patent

active

061062685

ABSTRACT:
A film extruder employing an internal deckle system including a pair of rectangular metal bars disposed in the pre-land area of the die one above the other with the opposing edges of each bar having a tapered surface. The tapered surfaces cause the bars to increase or decrease the total with of the flag when one of the bars is moved and to provide sufficient sealing pressure to effectively seal off the pre-land area. Preferable, the tapered wedge flags are disposed below the usual plug at each end of the extruder and apply sealing pressure against a deckle rod adjustably placed below the tapered wedge bars.

REFERENCES:
patent: 4659302 (1987-04-01), Maejima
patent: 5505609 (1996-04-01), Cloeren et al.
patent: 5511962 (1996-04-01), Lippert

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