Method and apparatus for forming Z-shaped folds in a tubular fil

Details Method and apparatus for forming Z-shaped folds in a tubular fil Method and apparatus for forming Z-shaped folds in a tubular fil

1982-03-24

1984-07-31

Kee Chi, James

Textiles: weaving

Special-type looms

Open-back shed

139291R, 66147, 156227, D03D 3700, D03D 4900, D03J 100

Patent

active

044624310

ABSTRACT:
Z-shaped folds are formed in a tubular film and the latter is inserted into a woven tubing as the latter is woven and collapsed in a circular loom. The tubular film is squeezed between pairs of pinch rollers and is then inflated to form a bubble, which is supported by annular surfaces at the weaving ring and at a distance from the latter so that the bubble bulges between the annular surfaces so as to form an annular bead. A Z-shaped annular fold is formed in that tubular film in that edge portion of said annular bead which is remote from the weaving ring is pushed into the latter. For the fixation of the Z-shaped folds e.g., at the portions which will subsequently form the rims at the open ends of the bags to be made, it may be desirable to apply adhesive to the tubular film above the Z-shaped folds and to force said adhesive-coated portions against the inside surface of the surrounding woven tubing.

REFERENCES:
patent: 2913799 (1959-11-01), Rabeux et al.
patent: 4065339 (1977-12-01), Lippert et al.
patent: 4373979 (1983-02-01), Planeta

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