Abstract
Plastic films which are transported by many rollers are wound up in the roll. This winding method is called the roll-to-roll system. This production system which is performed a large number of processes makes it possible to low-cost and mass production. However, when the web is wound up in the roll, surface asperity of the wound roll occurs by thickness variation of the web. We need an accurate measurement of internal stress in the roll for winding up many webs without occurring surface asperity of the roll. However, the research on internal stress state in wound roll considering the thickness variation in width direction of the web has not yet been carried out. In this study, we fabricated a multipoint sensor to measurement the radial stress distribution in axial direction. As a result, we succeeded in fabrication of the sensor that can be measured it.
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