Biaxially stretched tubularly extruded film with transverse clos

Details Biaxially stretched tubularly extruded film with transverse clos Biaxially stretched tubularly extruded film with transverse clos

1987-12-31

1989-06-27

Robinson, Ellis P.

Stock material or miscellaneous articles

Hollow or container type article

Nonself-supporting tubular film or bag

156 66, 383 63, 428112, 428222, 428910, B32B 330, B65D 3364

Patent

active

048429074

ABSTRACT:
A film tube extruded from high density polyethylene is biaxially oriented in longitudinal or machine direction as well as in cross machine diameter-increasing direction, and an extruded closure strip carried helically on one wall of the tube is correspondingly stretched as a result of the biaxial stretching to which the film of the tube is stretched. The closure-strip-carrying, biaxially oriented tube is adapted to be converted into a ribbon sheet form with the closure strip extending as individual closure strip sections across the ribbon sheet form at longitudinally spaced intervals, and adapted for making bags. A method of making the material, and apparatus for practicing the method are disclosed.

REFERENCES:
patent: Re29208 (1977-05-01), Naito
patent: 4528235 (1986-07-01), Sacks et al.
patent: 4701361 (1987-10-01), VanErden

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