I have trouble maintaining edge trim at the slitters. How do I insure a steady ribbon of edge trim? 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: […]
Author: Scott
What causes a crescent or bow-shaped cut?
What causes a crescent or bow-shaped cut? There are several possible sources for this problem. First, check the bed knife to make sure it is straight across the entire surface. This is done by measuring from the edge of the knife to the back of the knife in a half dozen evenly spaced intervals along […]
When taking a side trim, I sometimes find one side of the pile builds up higher than the other side. Why does this happen?
When taking a side trim, I sometimes find one side of the pile builds up higher than the other side. Why does this happen? Assuming the caliper of the material doesn’t vary across the machine, this condition usually indicates a slit quality problem. Check for improper penetration of the upper slitter blade, inadequate side pressure […]
We don’t have a squareness problem when sheeting a 50” wide roll. However, when we slit the same roll into 2 piles, 25” across, one sheet is square, while the other is not. What is causing the sheets to be out of square?
We don’t have a squareness problem when sheeting a 50” wide roll. However, when we slit the same roll into 2 piles, 25” across, one sheet is square, while the other is not. What is causing the sheets to be out of square? Check your draw roll section to make sure the cutter’s draw drum […]
I notice length variation when I sheet material. What can I do to prevent short sheets?
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 […]
When slitting coated paper, the sheets have dusty edges. What can be done to minimize this problem?
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 […]
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?
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 […]
When I run multiple webs of light weight material, it sometimes wrinkles prior to cutting. How do I avoid that?
When I run multiple webs of light weight material, it sometimes wrinkles prior to cutting. How do I avoid that? This is a common problem if the webs have baggy centers or edges. When the webs come together, static may cause them to stick together (especially on coated grades). If a web is baggy, it […]
How do I eliminate “checking” or “alligatoring” (the fracturing the board surface) at the decurl station?
How do I eliminate “checking” or “alligatoring” (the fracturing the board surface) at the decurl station? This problem usually occurs on heavier board grades, when the Operator attempt to overcome the curl set created in the web near the core. There are four factors to consider in avoiding “checking”: 1. Core Size – If possible […]
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