Method and apparatus for determining at least one sheet stretch value of a roll of material
AssigneeHTRC Automation Inc.
InventorBenoit LaPlante
Life of this patent
Estimating the term…
Abstract
There are provided a method and an apparatus for determining at least one sheet stretch value of a roll of material. The method comprises the steps of (a) radially marking one side end of the roll from periphery thereof to produce a series of aligned marks along a radius thereof; (b) supporting the roll in such a manner that it is free to rotate, thus allowing relaxation of peripheral layers thereof; and (c) after steps (a) and (b), measuring a lateral shifting value GAP of one of the marks, which is the outermost in periphery of the roll, with respect to an adjacent mark.
Claims16
Method for determining at least one sheet stretch value of a roll of material, comprising the steps of:
- (a) radially marking one side end of said roll from periphery thereof to produce a series of aligned marks along a radius thereof;
- (b) supporting said roll in such a manner that said roll is free to rotate, thus allowing relaxation of peripheral layers thereof;
- and
- (c) after said steps (a) and (b), measuring a lateral shifting value GAP of one of said marks, which is the outermost in periphery of said roll, with respect to an adjacent mark of said marks, said value GAP being representative of said sheet stretch value of the roll.
Apparatus for determining at least one sheet stretch value of a roll of material, one side end of said roll being radially marked from periphery thereof to produce a series of aligned marks along a radius thereof, said apparatus comprising:
- supporting means for supporting said roll in such a manner that said roll is free to rotate, thus allowing relaxation of peripheral layers thereof;
- and
- first measuring means for measuring a lateral shifting value GAP of one of said marks, which is the outermost in periphery of said roll, with respect to an adjacent mark of said marks, said value GAP being representative of the sheet stretch value of said roll.
Dependencies are inferred from the claim text.