Folding and tear control
Creasing and perforation rules for clean folds and controlled tear lines
The quiet lines in a cutting die are often the most important. A box can cut perfectly, but if the crease is wrong the fold cracks; if perforation is wrong the user cannot tear it cleanly.
Where this die fits
Creasing compresses board without cutting it. Perforation cuts at intervals to create a controlled tear line. Perforating rule and steel rule requests are reviewed in the same tear-line family, with tooth-gap ratio adjusted to material thickness and end use.
When board weight, grain direction, lamination and press pressure are known, folding quality improves. Pharma boxes, promo cards and hanger packaging benefit from this detail.
- 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?
Tear ease and product strength are balanced.
3 How do you reduce crease cracking?
Board weight, grain direction and channel width are selected together to reduce cracking.