Process for forming oriented multi-layer films having a differen

Details Process for forming oriented multi-layer films having a differen Process for forming oriented multi-layer films having a differen

1983-04-27

1985-01-29

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

15624414, 264564, 264130, 264173, 264285, 4251331, B29D 724

Patent

active

044965168

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:
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patent: 3712847 (1973-01-01), Rasmussen
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patent: 4358330 (1982-11-01), Aronovici

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