Plastic bags can be divided by material OPP, CPP, PP, PE, PVA, EVA, composite bags, co-extruded bags.
OPP plastic bag:
Characteristics: hard, pull unchanged. Not stretch (two-way pull stretch) monolithic Fold edge seal welding, the longest length can not exceed 640m / m. Monolithic long 1.28M, width 0.6M.
Pros: good transparency.
Disadvantages: easy to tear the seal on both sides.
PP plastic bags:Polypropylene
Features: hardness inferior OPP, stretch (two-way pull stretch) after pulling into a triangle, bottom or side sealed envelope (envelopes), tube material. Transparency worse than the OPP.
PE plastic bags:Polyethylene
Features: formalin, somewhat less transparency.
HDPE：Highdensitypolyethylene Feel brittle, and more for doing vest bag.
LDPE：Lowdensitypolyethylene Soft touch.
PVA plastic bags:VINYLON
Features: eco-friendly materials, on the water will melt. This material can not be produced, by the Japanese imports expensive abroad more often.
Advantage: soft transparency, pollution-free.
CPP plastic bags:
Features: Non-toxic, atheism formalin, can compound, transparency is better than PE, hardness slightly worse. After the president to pull out of soft, transparent PP, there are soft PE.
Compound pocket
Features: edges firmly seal strength, printability, ink will not come off.
Coextrusion bag:
Characteristics: transparency, soft, printable.
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