What are the process characteristics of the composite method of flexible packaging? What are the advantages and disadvantages of different composite methods? Why the proportion of dry compounding in the flexible packaging industry is much greater than other compounding methods? Why is the solvent-free compounding method widely admired now? After reading the two tables below, you may understand.
1. Comparison of various composite film technology characteristics
Compound method
Adhesive
Solid content
Solvent
Features
Compound object
advantage
Disadvantages
Wet lamination
Vinyl acetate emulsion
Polyvinyl acetate, polyvinyl alcohol, butyl phthalate
water
Cheap and oil resistant
Not resistant to water and heating
Foil and paper, composite paper
Acrylate emulsion
Acrylic copolymer, emulsifier
water
Flexible and water resistant
Acrylic smell
PVC, polyester, polystyrene and paper
EVA emulsion
EVA emulsifier
water
Flexible and less odor
Not heat resistant
Polyvinyl chloride, resin, polystyrene and paper
Dry compound
Vinyl acetate solution
Polyvinyl acetate
Vinyl acetate, alcohol
Oil resistant
Not resistant to water and heating
Foil, cellophane, cellulose acetate
Polyvinyl chloride solution
Polyethylene-vinyl acetate copolymer
Vinyl acetate, methyl ethyl ketone
Oil and water resistant
Not heat resistant
Foil, PVC, moisture-proof cellophane
Polyurethane solution
Polyester, polyisocyanate
Vinyl acetate, methylene chloride
Boiling water resistant
High price
Foil, polyethylene, polypropylene, polyester
Hot melt compound
wax
Paraffin, wax
——
health
Not heat resistant, compound fastness
Foil, paper, general film
EVA
EVA , wax, resin
——
health
Not heat resistant
Foil, paper, general film
Extrusion coating (polyethylene, polypropylene)
——
——
——
Hygienic and cheap
Film only
Foil, polyethylene, polypropylene
Water soluble primer
Imino system
Water, alcohol
Hygienic and cheap
Not water resistant
Stretched polypropylene
Solvent-based primer
Phthalates
Vinyl acetate, toluene
Universal and inexpensive
Not water resistant
Foil, general film
Urethane
High compound fastness and heat resistance
High price
Foil, general film
Coextrusion
Simultaneous molding, low cost
Limited composition
Polyethylene, polypropylene, nylon, polyester, EVA, EVA saponification, polyvinylidene chloride
2. The characteristics of the composite membrane produced by the main composite process
Compound process
Coating amount / (g / ㎡)
Hot water
Oil resistant
transparency
Curling
remaining solvent
Solvent-free compound
0.8 ~ 2.0
excellent
excellent
excellent
excellent
excellent
Dry compound
1.8 ~ 5.0
excellent
excellent
good
good
difference
Hot melt compound
0 ~ 4
difference
difference
difference
excellent
excellent
Extrusion compound
0.01 ~ 0.1
good
good
good
difference
good
Wet compound
2 ~ 6
good
good
difference
difference
excellent
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