Check your draw roll section to make sure the cutter’s draw drum and squeeze roll are properly aligned. Remove the before knife doctor board to ease the ability to measure alignment. Using a plumb bob, measure the distance from the plumb bob’s line to the nearest point on the squeeze roll and the nearest point […]
Category: FAQ’s
I notice length variation when I sheet material. What can I do to prevent short sheets?
Short sheet lengths are usually associated with excessive brake pressure at the roll stand or inadequate nip roll pressure. See if less brake and heavier nip at the cutter’s squeeze roll remedies the problem. The surface of draw drum and squeeze roll should also be checked. If either roll is glazed or slippery, the web […]
When slitting coated paper, the sheets have dusty edges. What can be done to minimize this problem?
Slitter dust that accumulates at the center slit is attributed to misadjusted or worn slitter blades. check the settings and blade condition, replacing the top knives or bottom rings as required. Slitter dust that occurs on the outside edges of the sheet may be caused not only by dulled slitters but by the trim removal […]
During setup, the Operator sometimes has difficulty squaring the sheet. Any suggestions?
An out of square cut can be caused by a number of factors. An improper squareness setting is one possible cause for the problems. Check the setting and readjust if necessary. A web that weaves as it feeds into the cutter will also contribute to squareness problems. If this is occurring, adjust the unwind stand […]
On short cut offs, the leading edge of the sheet follows the fly knife. My operator slows down the machine. What can be done to increase speed?
It might be that the cross cutting blades are dulling, and not cutting cleanly through the web. Check the knives for sharpness or adjust for greater clash. Improper curl correction is another possible cause for this problem. If the curl is not properly treated at the decurl section, then sheets with too much “up” curl […]
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 […]
I have a 65″ wide sheeter and run 28″ wide rolls most of the time. How can I get the maximum use of my sheeter?
You have two choices. First, if you have the ability to slit in line on your sheeter consider purchasing wider rolls and run two piles across the sheeter. You should buy your rolls wide enough for double width and an additional ¾” to allow for a slight edge trim on both sides to insure accurate […]
I have six shaft type roll stands on my envelope sheeter and spend a lot of time setting up the rolls and aligning them. What can I do to increase my run time and get more production from the sheeter?
There are several alternatives to minimizing down time due to roll changes. First, you may consider having a second set of shafts so that you can “preshaft” the next set of rolls while the current set is being run. Another option is to invest in air shafts. They have the advantage of eliminating chucks, which […]
