Machine for winding film, a method of making spools of pre-stret

Details Machine for winding film, a method of making spools of pre-stret Machine for winding film, a method of making spools of pre-stret

1998-05-13

1999-10-19

Darling, John P.

Winding, tensioning, or guiding

Wound storage package

Convolute coil

242176, B65H 1828

Patent

active

059674377

ABSTRACT:
A machine for winding film, a method of manufacturing spools of pre-stretched film, and spools of pre-stretched film obtained as a result, are disclosed. The method of winding spools of pre-stretched stretchable film includes importing oscillation to the film with a component perpendicular to the axis of the film. For example, during pre-stretched and winding of the film on a take-up spool, a feed spool, i.e. a spool from which the stretchable film for stretching is taken, is caused to oscillate, and/or the take-up core is caused to oscillate. This ensures that successive layers of film are offset, in particular at the margins of the film. Spools of film obtained in this way do not have portions of extra thickness and lower tension at the margins as is the case prior art spools of pre-stretched film.

REFERENCES:
patent: 3297155 (1967-01-01), Gattenby, Jr. et al.
patent: 4934622 (1990-06-01), Hakiel
patent: 5531393 (1996-07-01), Salzsauler et al.

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