What is the cause of the compound bag wrinkles?
Composite bags of good products show horizontal wrinkles, especially the two ends of the reel often show. This kind of wrinkles are flattened with one kind of substrate, and the other kind of protrusions constitute the authentic majority.
1), the initial viscosity of the adhesive is lacking,
2), the substrate surface tension is lacking
1), two kinds of base film unwinding tension is not suited, one is too big, one is too small, such as BOPP / AL compound, such as BOPP tension is too large, drying tunnel heat, elongated, AL tension is not big, Coupled with the elongation is small, composite, BOPP cooling shortening caused by aluminum foil protrusion, horizontal showing a one of the authentic,
2), lack of glue, uneven, resulting in poor adhesion, resulting in some local wrinkles,
3), the winding tension is too small, the volume is not tight, the composite after the relaxation of the scene, to shorten the supply of the substrate may be shortened, if the winding tension, crushing compaction, immediately after the machine sent to the curing room Curing, even if the process is not suited to some, it will not show wrinkles,
4), the oven temperature is too low and not ventilated, the residual solvent too much dry adhesive lack of initial lack of viscosity, to the two basement membrane to each other may be given.