A wavy edge on the slit side of sheets, suggest the bottom slitter rings may have a slight wobble. It could be the slitter rings or it could be the condition of the bottom slitter shaft. First, make sure the inside diameter of the bottom slitter ring is sized properly for the shaft so that […]
Category: Cutters
I had been running my sheeter without any sheet squareness problems, but lately when I sheet 3 or 4 piles across the width of the sheeter, the sheets on the drive side are out of square. What can I do?
There maybe several causes contributing to “out of square” sheets. It is best to work your way through the cutter, correcting any maladjustment you encounter. First, make sure the top slitters are set properly against the bottom rings. If the top slitters penetrate into the web flow too much, the web will deflect and wrinkle. […]
I am running four rolls of paper, splitting it in half at the slitter section prior to cutting it. At the pile, the width of each pile varies noticeably. Why?
Are you taking an edge trim on each side of the rolls? Widths vary to within 0.015” (0.38 mm) from roll to roll. When put on a roll stand, incoming webs can wander as much as 0.125” (0.17 mm), particularly from the furthest roll stand. To ensure width accuracy on multiple pile work is maintained, […]
When I run two rolls of board on my machine, the sheets are not the same length. Why?
This effect is called “stair cut” and is common on all sheeters when multiple webs are pulled in through the draw roll. Basically, what happens is the bottom web wraps the draw roll at a given angle and diameter. The second web wraps the draw roll at the same angle and diameter plus the thickness […]
When I slit and run two piles, one sheet is square and the other is out of square What adjustments can I make to address this?
Be certain there is enough tension to keep the web taut and the slitters are set properly. Watch the flow between the pull roll section and tape take away section. Make sure the material is staying flat through the cutter. (This is done on MAXSON sheeters using air washed doctor boards.) In the tape take […]
When I slit and run two piles, I have trouble with wrinkles on one side. How can I resolve this problem?
There are several things that might be causing wrinkles: Check the roll stand brake pressure to be sure the web is taut across the width of the sheeter. Be careful because if too much tension is applied, you will get short sheets. Measure the slitter penetration. You need to have the top blade overlap […]
I’m having trouble running 0.024” (400 gsm) thick board on my stationary bed knife cutter. The leading edge has a lip or “bead” on it and the trailing edge is fuzzy. What can I do to fix this problem?
Both problems are caused by material flow through the knife area and knife cut angles. There are a few areas you can look at to solve this problem. The first thing to try is repositioning the doctor boards before the bed knife to give it more of a “water fall” effect or steeper approach angle […]
I have trouble maintaining edge trim at the slitters. How do I insure a steady ribbon of edge trim?
Here are several issues and conditions that have an impact on edge trim performance: Slitter Condition: To determine cut quality, both male and female knives should be either new or resharpened. Sharp knives maintain a consistent cut necessary for slitting a narrow continuous stream of light weight material. Slitter Set-up: It is important to determine […]
I have a problem with sheet length accuracy on my existing sheeter. On cutoffs less than 30” (762 mm) the sheet length is within tolerance, but it deteriorates on longer cutoffs. I also see more variation during start up and slow down of the line. Is ther
The condition you describe is typical of a mechanical system which has begun to show signs of wear. There are two courses of action which you can take: Check all pulleys and shafts for mechanical lash or wear. Check for wear in gear boxes or transmissions and repair or replace as necessary. This should bring […]
When running two rolls of board superimposed on my dual knife rotary sheeter, the cut edge is clean, but the slit edge is dusty. What can be done to improve the quality of the slit edge?
There seems to be no clear cut answer to this problem. There are a few adjustments you might try. Bear in mind, that it may require a combination of things to bring the slit quality up to acceptable standards. Reposition the slitter’s mounting dovetail bar to insure that the slit edge is supported as it […]
