Wrinkling of webs can be caused by baggy edged rolls, misaligned rolls between the unwind position and the sheeter’s draw drum, severe wrap around rollers, or when running multiple rolls, friction between webs. Here are some suggestions: Baggy edged rolls An unevenly coiled roll has imbalanced tension across the face of the web. In such […]
Category: Web Conditioning
Should I run material down the center of the machine or off an edge?
There are many variables to be considered; however, as far as most sheeters are concerned mechanically, it doesn’t really matter. Here are a few questions which must be asked. 1. What type of roll stands are being used. Shafted with chucks? Shafted with air shafts? Shaftless? If shafted with chucks is the answer, the roll […]
From time to time, we have to sheet poorly wound rolls with baggy edges. How do you compensate for this roll defect?
Add a bowed roll prior to the decurl to help smooth out the web. With this in place, the decurling action should not create or induce wrinkles. If you are sheeting multiple webs, then each web should have its own bowed roll.
When decurling 0.028” thick (500 gsm) coated recycled board, the surface of the sheet gets cracked. What can I do?
You might consider ordering your board “coated side in”, so that the web feeds into the decurl section with coated side down. If this is not practical, investigate ordering your roll stock on larger diameter cores. (Most of the cracking occurs at the end of the roll where more decurl is needed.) Cores diameters of […]
