Multi-layer blown-film extrusion die

Details Multi-layer blown-film extrusion die Multi-layer blown-film extrusion die

1997-06-05

1999-11-16

Pyon, Harold

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

Extrusion shaping means

425190, 425380, 425462, 425467, B29C 4726

Patent

active

059846577

ABSTRACT:
This invention relates to a Multi-Layer Blown-Film Extrusion Die. An Extrusion Die is a key component of extrusion equipment, used in manufacture of Blown film for packaging industry. Although this Extrusion Die relates to production of five or more layers of blown films, it can also be used for production of lesser number of layers. While in the conventional outside fed die, melt was to be conveyed around the die in a fanning-out configuration, in this invention the polymer melt is split into two streams, before being fanned or spread around the circumference. Polymer melt enters several spiral or helical grooves prior to joining the gap that enjoins melt with other layers of the melt streams. The dimensions of spiral grooves and lands are carefully calculated, keeping in view relevant factors such as melt viscosity, shear sensitivity temperature and pressure requirements etc.

REFERENCES:
patent: 3334382 (1967-08-01), Lefevre
patent: 3947173 (1976-03-01), Dougherty
patent: 4738611 (1988-04-01), Briggs
patent: 5069612 (1991-12-01), Teutsch et al.
patent: 5667818 (1997-09-01), Guillemette

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