Plastic bags can be divided by material OPP, CPP, PP, PE, PVA, EVA, compound bag, co-extrusion compound bag, etc.
1. The OPP plastic bag
Features: hard, after pulling the same.Do not stretch (two-way stretch), single chip can be folded in half and edge sealing welding, and the length of the longest must not exceed 640 mm.Single long 1.28 m, 1.28 m wide.
Advantages: good transparency.
Weakness: both sides pincer-like device is easy to tear.
2. PP plastic bag: PP (polypropylene)
Feature: the hardness after OPP, stretching (two-way stretch), the back is triangular, bottom sealing or edge sealing (envelope bag),
Tube materials.Worse than OPP transparency.
3. The PE plastic bag, PE (polyethylene)
Features: there is formaldehyde, transparency is a bit poor.
HDPE, high density low pressure polyethylene (high density polyethylene) feel crisp, used for making vest bag.
LDPE: high pressure low density polyethylene (1. W density polyethylene) feel soft.
4. PVA plastic bag: vinylon
Features: environmental protection material, that dissolve in water.Could not produce the raw materials, imported from Japan, expensive, widely applied in foreign countries.
Advantage: soft, good transparency, pollution-free.
5. The CPP plastic bag
Features: non-toxic, formaldehyde-free, can compound, transparency is better than PE, hardness is a bit poor.Back grow 'texture soft, the transparency of PP, PE soft.
6. Compound bag
Feature: the cell edge sealing strength, can printing, printing ink will not fall off.
7. Co-extrusion bag
Features: good transparency, texture is soft, it can be printed.