Transparent plastic film comprising a low density polyethylene

Details Transparent plastic film comprising a low density polyethylene Transparent plastic film comprising a low density polyethylene

B - Operations, Transporting

32

B

18/1036

B32B 27/32 (2006.01) C08F 110/02 (2006.01) C08J 5/18 (2006.01)

Patent

CA 1306593

ABSTRACT The present invention teaches an oriented olefinic film, e.g. polyethylene, which can be made with highly oriented crystalline phase unit cells. The film of the present invention has crystalline phase unit cells with an a-axis highly oriented in the machine direction and consequently, improved physical properties. Specifically, the film has a good cutter bar tear, a high degree of puncture resistance and limited tear propagation in the transverse direction. The film is made by controlling the heat transfer of a chill roll to the olefinic extrudate. Heat transfer is accomplished by pinning the olefinic film with an air knife as it is extruded on the chill roll. The pin is controlled by adjusting the temperature of the chill roll and the focus velocity of the air knife. 34,708-F

560686

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