Causes
- Winding too tight
- Winding too loose
- Unsuitable feed rolls
Effects
- Air pockets
- Telescoping
- Star formation / tree rings
- Reduced machine speeds
- Uneven substrate adhesion
- Product rejects
The winding of product webs is as natural as it is susceptible. The process step harbors many product-specific sources of error that can permanently disrupt subsequent processing.
For example, winding too tightly can lead to compression folds near the core. Laminated products tend to telescope here. Too low winding tension results in a “soft” roll which, in addition to a lot of wrapped air, tends to lie flat and also to telescope. Laminated products with horizontal plating show a clearly different product adhesion in the area of the flattening, which results in oscillating peel-off behavior.
