Spare reels wound onto compressible support tube - has inner and outer ring areas which are wound with greater tension in outer ring area to retain compact compressed storage shape until used

摘要

The reel (2) has an inner ring area (3) enclosed by an outer ring area (4). The material in the outer ring is wound up under a greater tension than the material in the inner ring and the elongation difference thereby caused between the two rings is at least 10 % of the breaking strain of the material web. The tension can be raised by increasing the circumferential speed of the spare reel during winding in relation to the entry speed of the material web. The winding machine has a programmed winding curve with an increase in the end area. ADVANTAGE - The reel can be compressed for transport and storage and then returned to its original shape for use.