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 […]
Author: Scott
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 […]
I run two rolls of light weight material on my sheeter and I have trouble keeping the back web in line because it seems to bounce up and down and track from one side to the other. What can I do?
There are a couple of things that can be done. See if the roll stand can be moved closer to the sheeter, so as to shorten the distance of an unsupported web. If the roll stand cannot be moved, install a carrier roll between the roll stand and the sheeter infeed. The carrier roll design […]
I have an older style roll stand behind my sheeter with a spring-loaded handle to control the friction on the brake drum. What can be done to upgrade this to a better system and possibly introduce automatic tension control?
There are a couple of ways to improve your brake and tension system. First, replace the mechanical brake drum arrangement with a pneumatic type brake disc. This will provide the Operator with the ability to adjust the brake pressure more accurately. Next, consider the tension control system itself. There are many types of automatic tension […]
How long does it take to change a roll and what should you do to minimize roll change time?
There are two types of roll stands, shafted and shaftless. Shaftless roll stands require the least time to change since all that is required is to position the roll in place, insert the chucks, and raise the roll. Having the rolls stripped of their wrappers, staged and ready to load will expedite this process. This […]
