Oriented multi-layer films having a different orientation distri

Details Oriented multi-layer films having a different orientation distri Oriented multi-layer films having a different orientation distri

1982-08-09

1984-04-10

Ives, P.

Stock material or miscellaneous articles

Hollow or container type article

Cellular material derived from plant or animal source

4284761, 428516, 428520, 428910, 428448, 428451, 264176R, 264173, 4251331, B32B 2732

Patent

active

044421478

ABSTRACT:
The invention comprises an oriented multi-layer film having a different orientation distribution between at least two layers and a novel process for forming oriented multi-layer films having a different orientation distribution between the layers. An important feature is the formation of a first tubular layer which is folded and fed into the interior of a second tubular layer of smaller diameter. Upon inflation of the inner tubular layer of larger diameter to its maximum unstretched diameter the smaller diameter outer tubular layer will be stretched and will also be oriented if the stretching occurs while the temperature of the smaller diameter outer tubular layer is maintained within the orientation temperature range of that material.

REFERENCES:
patent: 3712847 (1973-01-01), Rasmussen
patent: 3726743 (1973-04-01), Reifenhauser
patent: 3891374 (1975-06-01), Ninomiya
patent: 3926706 (1975-12-01), Reifenhauser
patent: 4011128 (1977-03-01), Suzuki
patent: 4039364 (1977-08-01), Rasmussen
patent: 4076568 (1978-02-01), Kubat
patent: 4239111 (1980-12-01), Conant
patent: 4243463 (1981-01-01), Gash
patent: 4279957 (1981-07-01), Hiraoka et al.
patent: 4358330 (1982-11-01), Aronovici

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