| 摘要 |
There are provided a method and an apparatus for determining at least one sheet stretch value of a roll of material (2). The method comprises the steps of (a) radially marking one side end of the roll (2) from periphery thereof to produce a series of aligned marks (4) along a radius thereof; (b) supporting the roll (2) 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 (10), which is the outermost in periphery of the roll (2), with respect to an adjacent mark (16).
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