Die for extruding tubes composed of a plurality of layers

Details Die for extruding tubes composed of a plurality of layers Die for extruding tubes composed of a plurality of layers

1977-08-23

1980-01-29

Rosenbaum, Mark

Plastic article or earthenware shaping or treating: apparatus

Means providing a shaping orifice

Plural distinct feed inlets

4251331, 425466, 425467, B29D 2304

Patent

active

041859545

ABSTRACT:
A die comprising a central core and at least two thickness adjusting rings surrounding the core concentrically therewith and providing a resin passage between the core and the inner thickness adjusting ring and another resin passage between the inner and outer thickness adjusting rings, each of the rings having a planar seat surface. The rings are joined at their seat surfaces to the core, or alternatively, the inner ring is joined to the core and the outer ring to the inner ring similarly, whereby the rings are rendered radially shiftable for adjustment. Each of the resin passages is provided with resin inlets positioned substantially at the same level as the corresponding planar seat surface.

REFERENCES:
patent: 3649143 (1972-03-01), Papesh et al.

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