Delamination happens when the bond between layers is too weak for the stresses of converting or use, from too little adhesive, too cool a calender, contamination or incompatible materials. It shows up as bubbles, peeling or layers splitting at cut edges. Peel strength tests measure the risk, and the defect is a frequent source of customer complaints.
SMS is splitting into layers at the slit edge, that's delamination, bring the calender temperature up.
Also heard as
- delam
- ply separation
- layer separation
Related terms
Lamination
Joining a nonwoven to film, another nonwoven or other material to make one multilayer product.
Backsheet
Outer, liquid-proof layer of a diaper or pad, usually breathable film laminated to a soft nonwoven.
SMS
Spunbond-meltblown-spunbond: a three-layer composite of strong spunbond outer layers around a meltblown barrier core.
Calender bonding
Thermal bonding in a heated roll nip, either across the whole surface or at points set by an engraved roll.
Same word, different worlds
Separation of a coating from its substrate or of one coating layer from another.
Printed Circuit BoardsSeparation between layers of a board's laminate or between laminate and copper, usually from heat or moisture.
Concrete & CementA surface layer that has split away from the concrete below it, found by the hollow sound it makes when tapped.