Plastic packaging bag is a kind of packaging bag that uses plastic as raw material to produce various articles in daily life. It is widely used in daily life and industrial production, but the convenience at this time brings long-term harm. Commonly used plastic packaging bags are mostly made of polyethylene film, which is non-toxic and can be used to hold food. There is also a kind of film made of polyvinyl chloride, which is also non-toxic, but the additives added according to the purpose of the film are often harmful to the human body and have a certain degree of toxicity. Therefore, this kind of film and plastic bags made of the film are not suitable for holding food.
Plastic packaging bags can be divided into OPP, CPP, PP, PE, PVA, EVA, composite bags, co-extrusion bags, etc. according to their materials.
Advantages
CPP
Non-toxic, compoundable, better in transparency than PE, and slightly inferior in hardness. The texture is soft, with the transparency of PP and the softness of PE.
PP
The hardness is inferior to OPP, it can be stretched (two-way stretch) after being stretched into a triangle, bottom seal or side seal
PE
There is formalin, but the transparency is a little bit poor
PVA
Soft texture and good transparency. It is a new type of environmentally friendly material. It melts in water. The raw materials are imported from Japan. The price is expensive. It is widely used abroad.
OPP
Good transparency and strong hardness
Composite bag
The seal is strong, printable, and the ink will not fall off
Co-extrusion bag
Good transparency, soft texture, printable
Plastic packaging bags can be divided into different product structures and uses: plastic woven bags and plastic film bags
Woven bag
Plastic woven bags are composed of polypropylene bags and polyethylene bags according to the main materials;
According to the sewing method, it is divided into bottom bags with seams and bottom bags with seams.
It is widely used as a packaging material for fertilizers, chemical products and other items. The main production process is to use plastic raw materials to extrude the film, cut, and uniaxially stretch into flat filaments, and then weave the products through warp and weft, which are generally called woven bags.
Features: light weight, high strength, corrosion resistance, etc., after adding plastic film lining, it can be moisture-proof and moisture-proof; light bag load is under 2.5kg, medium bag load is 25-50kg, heavy bag load is 50-100kg
Film bag
The raw material of plastic film bags is polyethylene. Plastic bags have indeed brought convenience to our lives, but the convenience at this time has brought long-term harm.
Classified by production materials: high-pressure polyethylene plastic bags, low-pressure polyethylene plastic bags, polypropylene plastic bags, polyvinyl chloride plastic bags, etc.
Classified by appearance: T-shirt bag, straight bag. Sealed bags, plastic strip bags, special-shaped bags, etc.
Features: Light bags load more than 1kg; medium bags load 1-10kg; heavy bags load 10-30kg; container bags load more than 1000kg.
Post time: Dec-23-2021