Method and apparatus for producing multi-layer expanded films

Details Method and apparatus for producing multi-layer expanded films Method and apparatus for producing multi-layer expanded films

1983-02-01

1984-12-18

Hayes, Lorenzo B.

Plastic article or earthenware shaping or treating: apparatus

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

Extrusion shaping means

15624414, 425 94, 425 97, 4253261, A21C 300

Patent

active

044888600

ABSTRACT:
Method and apparatus for forming multi-layer expanded film. A base film extruded by a die (6) is coated, immediately downstream of the die mouth (5), by a further layer of fluid propelled from a manifold (16) through a metering orifice (19). The combination of manifold and metering orifice is necessary to permit accurate control of the flow rate of the fluid and hence of the thickness of the coating, and the mouth of the die and the metering orifice must be very close so that the base film is as resistant as possible to deflection by the impact of the coating fluid, and so that contact takes place before any substantial expansion has taken place. The downstream end of the resulting multi-layer tubular film is then held closed in known fashion and the closed tube is expanded by air under pressure admitted by an opening (7) in the die (6).

REFERENCES:
patent: 2597553 (1952-05-01), Weber
patent: 2987776 (1961-06-01), Miller et al.
patent: 3160917 (1964-12-01), Berggren et al.
patent: 3709642 (1973-01-01), Stannard
patent: 3957566 (1976-05-01), Rahlfs
patent: 4248576 (1981-02-01), Birks et al.
patent: 4357191 (1982-02-01), Bullard et al.

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