Oriented multi-layer films having a different orientation...

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

B - Operations, Transporting

29

C

18/523

B29C 49/22 (2006.01) B29C 47/06 (2006.01) B29C 55/02 (2006.01) B29C 55/22 (2006.01)

Patent

CA 1191007

ORIENTED MULTI-LAYER FILMS HAVING A DIFFERENT ORIENTATION DISTRIBUTION BETWEEN LAYERS AND PROCESS FOR FORMING SAME Abstract of the Diclosusre 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 orienta- tion temperature range of that material.

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