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

B - Operations, Transporting

65

H

B65H 26/08 (2006.01) B65H 18/00 (2006.01) B65H 26/00 (2006.01)

Patent

CA 2097246

The method is for producing a first primary roll having a predetermined lateral surface defined by a diameter Df. 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 Sf of the lateral surface, which is covered by the spindle; (b) calculating a portion Si 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 Df where: Image (e) winding up material around the spindle to produce the first primary roll until a diameter of the first primary roll reaches said diameter Df; 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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