Distributor for thermoplastic extrusion die

Details Distributor for thermoplastic extrusion die Distributor for thermoplastic extrusion die

1975-04-21

1977-08-23

Husar, Francis S.

Plastic article or earthenware shaping or treating: apparatus

Means providing a shaping orifice

425376A, B29F 304

Patent

active

040437396

ABSTRACT:
An extrusion die for thermoplastic polymer is disclosed having a distributor which provides substantially constant residence time and pressure loss of polymer flowing through the die from the inlet to the extrusion aperture. Dies are disclosed for extrusion of sheet, film and discontinuous microfibers. The distributor has cross flow channels for conveying the polymer laterally and axially connected pressure loss and residence time control sections for independently compensating for the varying pressure loss and residence time characteristics of the polymer flow through the distribution channels. With a distributor so constructed, the overall height of the die remains substantially the same as the die width increases so that the distributor is particularly suitable for dies for wide extrusion lines.

REFERENCES:
patent: 2620752 (1952-12-01), Braibanti et al.
patent: 3384925 (1968-05-01), Rothemeyer
patent: 3825380 (1974-07-01), Harding et al.

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