What are the cause of the food packaging film fat from?

What are the cause of the food packaging film fat from? Food packaging film composite products can appear sometimes transverse furrow, especially at both ends of the drum are often appear. The wrinkles in a flat base material, another base material level off, another base material processes form the majority 'tunnel'. 1, material. A, adhesive at the beginning of the adhesion force is insufficient; B, base material surface tension is insufficient. 2, process. A, two kinds of basal membrane rolling tension does not adapt, a is too large, a kind of size. For example: BOPP/AL composite, such as BOPP tension is too large, bake, the hot love, elongated, AL tension can't be large, and elongation of small, after composite, BOPP cooling contraction causes the aluminum foil protuberant, transverse appear one at a 'tunnel'; B, insufficient amount of glue, uneven, cause the bond force is not good, cause local local wrinkles; c。 Winding tension is too small, the volume is not tight, compound after the relaxation phenomenon, offer to shrink the base material of contraction. If the winding tension, tightly rolled compaction, the plane to the curing chamber immediately after curing, even if the technology in some not too orientation, also won't appear wrinkles; d。 Oven temperature is too low and not ventilated, dry too much residual solvent adhesives is insufficient, the early adhesion force is insufficient, gives two kinds of basal membrane displacement.
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