Die for extrusion of blown plastic film

Details Die for extrusion of blown plastic film Die for extrusion of blown plastic film

1988-02-16

1993-11-16

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

425380, 425462, 425467, B29C 4720, B29D 2322

Patent

active

052618056

ABSTRACT:
The invention relates to the kind of die which has many helical grooves (40) spiralling around a mandrel, and to a new way of feeding the liquid resin from the main supply duct (48) to the grooves. Instead of the usual one groove to one conduit relationship, in the invention the channels (41) to the grooves are intercalated with the conduits (47). Each groove is fed via feed-channels (45,46) from two of the conduits, and each conduit feeds two of the grooves. The result is that the cooler liquid resin from the walls of the main duct is constrained to move to the centre of the stream in the groove. The arrangement leads to an improvement In the homogeneity of the resulting film.

REFERENCES:
patent: 3034526 (1962-05-01), Roselle
patent: 3966377 (1976-06-01), Upmeier et al.
patent: 4019843 (1977-04-01), Zimmermann
patent: 4063865 (1977-12-01), Becker
patent: 4182603 (1980-01-01), Knittel
patent: 4201532 (1980-05-01), Cole
patent: 4298325 (1981-11-01), Cole
patent: 4565515 (1986-01-01), Maier
patent: 4687430 (1987-08-01), Morris et al.

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