Even if the composite vacuum bag refers to the raw materials of different
categories with double layers or double layers, the sizing method can be used
according to the "structural" double-layer raw materials composed of necessary
skills.
There are several processing techniques for vacuum bags and co-extrusion
methods. At least one layer requires adhesives. 291 Adhesives can be roughly
divided into polyether and polyurethane adhesives. Polyether adhesives are
gradually being used. It has been washed away too, and polyurethane material
adhesives have two types: aliphatic and alicyclic.
Adhesives can also be divided into water-soluble adhesives, water-soluble
resin adhesives and non-water-soluble resin adhesives according to the type of
use. In China, the key is to use water-soluble resin adhesives." 98% of them are
alicyclic adhesives.
The adhesives used in composite packaging are mostly polyurethane, which is
made of polyhydroxy chemical substances and alicyclic isocyanate polymers, and
the residual alicyclic acrylate reactivity rate is hydrolyzed and converted into
futuramide.” Fructamide is such a harmful substance, and it will cause
environmental pollution if it is transferred into the food category.
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