Multi-core rotary circular die

Details Multi-core rotary circular die Multi-core rotary circular die

1976-06-11

1978-09-05

Husar, Francis S.

Plastic article or earthenware shaping or treating: apparatus

Means providing a shaping orifice

Plural distinct feed inlets

264209, 264241, 4251331, 425376B, 425466, 425467, B29D 2304

Patent

active

041116305

ABSTRACT:
A multi-core rotary circular die for preparing multi-layer tubular film comprises an inner core which is rotatably fitted in a hollow cylindrical body having a plurality of molten resin inlets and a plurality of middle cores having semi-spherical or spherical surfaces are fitted on the inner core adjacent the one end thereof. The middle cores form the molten resin passages for adjusting the thickness of the molten resin films. The inner core has annular resin storage channels on the periphery thereof and internal resin passages therein connected to the corresponding annular resin storage channels, which are respectively connected to the corresponding molten resin inlets, and an utility feeding passage is also formed in the inner core extending in the longitudinal direction thereof.

REFERENCES:
patent: 3546743 (1970-12-01), Roth
patent: 3649143 (1972-03-01), Papesh et al.
patent: 3802826 (1974-04-01), St. Eve
patent: 3856448 (1974-12-01), Iijima et al.
patent: 3947172 (1976-03-01), Myers

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