Folding and tear control
Creasing and perforation rules for clean folds and controlled tear lines
Creasing rules create the fold lines in a folding carton; perforating rules create a controlled tear line. Board caliper, grain direction and the intended opening or folding action guide the specification.
Where this die fits
Creasing uses a rule and matching counter channel to form the fold. A perforating rule alternates cutting teeth with gaps that leave connecting bridges. The tooth-to-gap ratio is selected for the material and the required tear behaviour.
Provide measured board caliper as well as grammage, grain direction, coating or lamination and press details. These inputs help specify crease channels and tear lines for pharmaceutical cartons, promotional cards and hanging packaging.
- Carton box creases and fold lines
- Tear-off coupons, hanger cards and inserts
- Packaging perforation and easy-open areas
- Multi-up dies needing repeat fold behavior
Checks for fold and controlled-tear lines
Creasing and perforation are different operations and do not produce the same press result. Board caliper, grain direction, channel width, tooth-gap ratio and required tear force are treated as separate production decisions.
- Creasing rule height and channel width
- Perforation tooth-gap ratio
- Grain direction and cracking risk
- Press pressure and rubbering effect
How to describe a crease or perforation request
State the material and weight, then mark whether the line must fold or tear in a controlled way. If there is cracking, difficult folding or premature tearing, send a sample with the problem direction marked.
- Board weight and surface finish
- Folding or tearing purpose
- Crease/perforation separation in drawing
- Quantity and machine type
Common questions
1
Is creasing a cut?
No. Creasing compresses the board to create a fold line without separating the material.
2
How is perforation ratio selected?
The cutting-to-gap ratio is chosen to balance tear force and the strength needed during printing, packing and handling. Send the material and, if available, a sample showing the desired opening behaviour.
3
How do you reduce crease cracking?
Board caliper, grain direction, surface finish, rule height and counter-channel width are reviewed together. A sample of the cracked fold helps identify whether the material or press setup also needs attention.
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