Method and apparatus for producing a primary roll of material or

Details Method and apparatus for producing a primary roll of material or Method and apparatus for producing a primary roll of material or

1997-07-07

1998-09-15

Nguyen, John Q.

Winding, tensioning, or guiding

Convolute winding of material

Detector, control, or material responsive stop

2425342, 2425632, 242912, B65H 1808, B65H 2606

Patent

active

058067850

ABSTRACT:
The method is provided for producing a first primary roll (8) having a predetermined lateral surface defined by a diameter D.sub.f, or for determining an amount of material available on a primary roll. The primary roll is made of material wound around a spindle (6). The material is used to produce smaller secondary rolls (12) of material. The method for producing the primary roll of material comprises steps of (a) calculating portion S.sub.f of the lateral surface, which is covered by the spindle; (b) calculating a portion S.sub.i of the lateral surface, which represents material needed to produce the smaller secondary rolls of material; (c) calculating a compression factor K1 which is derived from a compression rate K of a previous second primary roll used to produce previous secondary rolls with respect to the previous secondary rolls; (d) calculating D.sub.f where: D.sub.f =(4(S.sub.f +(S.sub.i K1)))/ (e) winding up material around the spindle to produce the first primary roll until a diameter of the first primary roll reaches said diameter D.sub.f ; whereby loss of material is reduced by taking into account compression factor K1 which varies with respect to time. Apparatus to perform the method of producing the first primary roll (8) and for determining the amount of material available on a primary roll for producing smaller secondary rolls (12) is also provided.

REFERENCES:
patent: 4021002 (1977-05-01), Meihofer
patent: 4535950 (1985-08-01), Lisnyansky
patent: 4913366 (1990-04-01), Andou
patent: 5402353 (1995-03-01), Laplante et al.

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