Multiple crossed layer film and method for making same

Details Multiple crossed layer film and method for making same Multiple crossed layer film and method for making same

B - Operations, Transporting

29

C

18/523

B29C 47/20 (2006.01) B29C 47/00 (2006.01) B29C 47/06 (2006.01)

Patent

CA 1130522

ABSTRACT OF THE DISCLOSURE A layered film of thermoplastic material is defined by a plurality of superposed layers, the material forming a pair of adjacent layers having molecular chains oriented in certain directions which respectively cross each other at an angle in a range of between 5° and 90°; the film is manu- factured by heating solid thermoplastic material to its softening point, conveying the viscous molten mass so formed while mechanically working the same to an annular material shaping opening of a rotary die or matrix from which the material is discharged in the form of a tubular segment which is directed into the nip defined by a pair of rotating stretching cylinders which flatten the tubular segment to form the layered film and which are rotated at a speed which tends to orient the molecular chains in an axial or machine direction; gas is injected into the space defined within the tubular segment which tends to orient the molecular chains in a circumferential or transverse direction; according to the invention, the die is rotated at a certain speed which, in combination with the take off speed of the rotating cylinders and the blow ratio acts to relocate the frost line of the tubular segment so that the desired molecular orientation is imparted to the film layers prior to the solidification of the viscous molten material.

321477

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