Head for the circular coextrusion of a plurality of thermo-plast

Details Head for the circular coextrusion of a plurality of thermo-plast Head for the circular coextrusion of a plurality of thermo-plast

1987-05-06

1989-05-23

Silbaugh, Jan H.

Plastic article or earthenware shaping or treating: apparatus

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

Extrusion shaping means

264173, 425192R, 4253791, 425380, 425462, B29C 4726

Patent

active

048325899

ABSTRACT:
A head for the coextrusion of a plurality of N thermoplastic materials, N representing a positive integer, consisting of N+1 thermally insulated plates which are substantially modular and fit together and are aligned by respective projections and recesses on each plate, each plate having a conduit to feed a thermoplastic material, one half of a collector-distributor cavity on one face for collecting and distributing the material, and one half of a channel on the same face which extends radially from the collector-distributor to a narrow annular space created by the separation between a central male inner body and the concentric inner surface of each plate. The intermediate plates between the end plates each also have on their second face a second half of a collector-distributor cavity and a second half of a channel which, by respective coupling with opposite halves of a collector-distributor cavity and opposite halves of a channel on the opposite face of an adjacent plate form a complete collector-distributor cavity and a complete channel which extend annularly over the entire plate, the radial position and width of the collector-distributor cavity and the channel being circumferentially eccentric with respect to the center of the head. The collector-distributor cavity is pear-shaped to impart a uniform velocity to the molten thermoplastic material and to avoid the formation of a flow junction which creates a weakness in the thin-film extruded product.

REFERENCES:
patent: 3308508 (1967-03-01), Schrenk
patent: 3327349 (1967-06-01), Lennox
patent: 3365750 (1968-01-01), Donald
patent: 4047868 (1977-09-01), Kudo et al.
patent: 4249875 (1981-02-01), Hart et al.
patent: 4280801 (1981-07-01), Wheeler, Jr. et al.
patent: 4285656 (1981-08-01), Herrington
patent: 4472129 (1984-09-01), Siard
patent: 4522775 (1985-06-01), Briggs et al.

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