Method and apparatus for producing a primary roll of material

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

1993-05-28

1995-03-28

Gordon, Paul P.

Boots, shoes, and leggings

2425342, 2425416, B65H 6308

Patent

active

054023530

ABSTRACT:
The method is for producing a first primary roll having a predetermined lateral surface defined by a diameter D.sub.f. The primary roll is made of material wound around a spindle. The material is used to produce smaller secondary rolls of material. The method comprises steps of (a) calculating a 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: ##EQU1## (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. An apparatus to perform the present method is also provided.

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