Manufacture of unique synthetic film and yarn

Details Manufacture of unique synthetic film and yarn Manufacture of unique synthetic film and yarn

1973-02-05

1976-04-13

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Layered, stratified traversely of length, or multiphase...

156244, 264 49, 264174, 264DIG47, B29F 312

Patent

active

039504760

ABSTRACT:
A synthetic film which comprises at least two unmixed polymeric components, at least one of the components occurring in the form of substantially endless threads in the longitudinal direction of the film. The threads have transverse dimensions that are smaller than the thickness of the film and are embedded in a basic mass of a different polymeric component.
The process for producing such synthetic films includes the steps of arranging at least two polymeric components, in the liquid state, side by side in a particular order to form a single main stream; repeatedly dividing and doubling the main stream into a multi-layer stream; temporarily dividing the multi-layer stream in a direction transverse to the direction of the layers at least once into sub-streams on the order of magnitude of the layer thicknesses in situ, while retaining the continuity of flow of the multi-layer stream and then extruding the resulting stream containing a plurality of the sub-streams through a casting slit to form said film.
Yarns and the like fibrillary products having a low fibril denier count are obtained from these films by removing the basic mass, e.g., by use of solvents or special heat treatment.

REFERENCES:
patent: 3051453 (1962-08-01), Sluijters
patent: 3239197 (1966-03-01), Tollar
patent: 3444031 (1969-05-01), Schrenk
patent: 3485912 (1969-12-01), Schrenk et al.
patent: 3565985 (1971-02-01), Schrenk et al.

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