Plastic bag classification
Plastic packaging bags can be divided into OPP, CPP, PP, PE, PVA, EVA, composite bags, co-extruded bags, etc. according to the material.
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OPP plastic bag:
Features: Hard, unchanged after pulling. Non-stretchable (two-way pull) single-piece folding, edge-sealed welding, the longest length can not exceed 640m / m. The single piece is 1.28M long and 0.6M wide. The
Advantages: good transparency. The
Disadvantages: The seals on both sides are easy to tear. The
PP plastic bag: polypropylene Polypropylene
Features: Harder than OPP, stretchable (two-way pull), pulled into a triangle, bottom or side seal (envelope bag), barrel. Transparency is worse than OPP. The
PE plastic bag: Polyethylene
Characteristics: There is formalin, the transparency is slightly poor. The
HDPE: High-density low-pressure polyethylene High-density polyethylene is easy to use as a vest bag. LDPE: Low density polyethylene Low density polyethylene Soft touch. The
PVA plastic bag: Vinylon
Features: Environmentally friendly materials that dissolve in water. This raw material cannot be produced domestically and is imported from Japan. It is expensive and is widely used in foreign countries. The
Advantages, soft and transparent, no pollution. The
CPP plastic bag:
Characteristics: non-toxic, no god formalin, can be compounded, transparency is better than PE, hardness is slightly worse. It will grow out after pulling, the texture is soft, the transparency of PP, and the softness of PE. The
Compound bag
Features: The edge seal strength is strong, it can be printed, and the ink will not fall off. The
Co-extruded bag:
Features: good transparency, soft texture, printable.
What is OPP material
OPP is a plastic bag name, OPP, PE, PET, etc. are all plastic products, also known as overload protection, the chemical name is n-phenylphenol. OPP is polypropylene,
OPP: Oriented, extensible polypropylene, a type of polypropylene, and bidirectional polypropylene (BOPP).
OPP main products:
OPP tape: It is based on polypropylene film and has the advantages of high tensile strength, light weight, non-toxic and tasteless, environmental protection and wide application range.
OPP bottles: light weight, low cost, improved transparency, good heat resistance, suitable for hot filling. In recent years, two-way polypropylene (OPP) transparent bottles have become the substitute for PET bottles.
Pp: Polypropylene, polypropylene. Can be used as general structural parts, corrosion-resistant chemical equipment parts, and heat-insulated parts.
The identification of waste plastics mainly includes: plasticizing temperature identification method, combustion identification method, density identification method, plasticizing temperature identification method: plasticizing temperature LDPE110~115; HDPE140~145; LLDPE125~130: PP165~170; PS145~150; PVC150~170;
Product name
Flame characteristics
Degree of burning
Appearance status
odor
PE
The upper part is yellow and the lower part is blue
Burning without interruption;
Smokeless, melted and dripped;
Such as paraffin burning smell
PP
Same color as PE flame;
Same as above
Black smoke, melted and dripped;
Like a smell of oil
PS
Orange flame
Same as above
Dark smoke, softening and foaming;
Styrene
PVC
Upper yellow, green at the bottom
Self-extinguishing from fire
White smoke, soft and can be drawn;
Such as hydrogen chloride smell, pungent
PET
Inner yellow outer blue
Uninterrupted burning time
Can be broken into pieces;
Irritant odor
Appearance characteristics:
PE feels more slippery, translucent when not colored, soft and tough. LLDPE feels softer, HDPE is slightly harder
PP is harder than PE, has good transparency, and is white translucent when uncolored.
The natural color of PVC is yellowish transparent and the transparency is better than PE PP. Soft products are soft and tough. Hard product hardness is higher than LDPE
And lower than PP
PET bottle material PET is divided into: the bottle mouth crystal is high temperature material, the bottle mouth and the bottle body are the same as low temperature material.