Guidelines for positioning the offset perforating rules should be clearly placed on the plates. Before beginning, make sure you can position the rule in precise accordance with the artwork. Be certain you also have the appropriate type and size of rule to complete the job correctly.
Problem
Paper is sticking to teeth on the perf
Possible Solution
Grippers need to be adjusted or replaced. Lay a piece of clear tape over the perf. Possibly apply a silicone spray to the rule teeth.
Problem
Perf is not perforating as desired
Possible Solution
Add pressure or change rule to a special high product.
Problem
Perf is slitting instead of perforating the paper
Possible Solution
Reduce pressure, try changing to a special low product, or overlay the rule with a piece of clear film tape.
Problem
Rule is not perforating at all
Possible Solution
Use a good hard 3- to 4-ply non-compressible blanket. Check the pressure.Reverse or use back side of blanket if possible. Does this particular press have springloaded cylinders designed to release under pressure as a safety precaution?
Problem
Teeth are bending or breaking off
Possible Solution
Reduce pressure and make sure the correct height of perf for the stock is being used.
Problem
Perforation is straying from guidelines
Possible Solution
Reduce pressure. Try using a 1/2” to 3/4” masking tape to overlay the perf (especially in high-speed web operations that generate heat).
Problem
Indentation or shoulder mark in paper is appearing adjacent to the perforated line
Possible Solution
Back off the pressure. Try a center-mounted rule to distribute pressure evenly to both sides of rule.
Problem
None of the above
Possible Solution
Call our toll-free number: 1-800-537-2514 for experienced technical assistance.