Plastic packaging bag is a kind of packaging bag that uses plastic as raw material and is used in the production of various products in 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, so it can be used to contain food. There is also a film made of polyvinyl chloride, which itself is non-toxic, but the additives added according to the use of the film are often harmful substances and have certain toxicity. Therefore, such films and plastic bags made of the films are not suitable for containing food.
Plastic packaging bags can be divided into OPP, CPP, PP, PE, PVA, EVA, composite bags, co-extrusion bags, etc.
| CPP | Non-toxic, compoundable, better transparency than PE, slightly worse hardness. The texture is soft, with the transparency of PP and the softness of PE. |
| PP | The hardness is inferior to OPP, and it can be stretched (two-way stretch) and then pulled into a triangle, bottom seal or side seal |
| PE | There is formalin, which is slightly less transparent |
| PVA | Soft texture, good transparency, it is a new type of environmental protection material, it melts in water, the raw materials are imported from Japan, the price is expensive, and it is widely used abroad |
| OPP | Good transparency, strong hardness |
| Compound bag | Strong sealing strength, printable, ink will not fall off |
| Co-extruded bag | Good transparency, soft texture, printable |
Plastic packaging bags can be divided into: plastic woven bags and plastic film bags according to different product structures and uses
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 seam bottom bag and seam bottom bag.
A packaging material widely used in fertilizers, chemical products and other items. Its main production process is to use plastic raw materials to extrude film, cut, and unidirectionally stretch into flat yarns, and obtain products through warp and weft weaving, 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; the load capacity of light bags is below 2.5kg, the load capacity of medium bags is 25-50kg, and the load capacity of heavy bags is 50-100kg
film bag
The raw material of the plastic film bag is polyethylene. Plastic bags have indeed brought convenience to our lives, but the convenience at this time has brought long-term harm.
Classified by raw materials: high pressure polyethylene plastic bags, low pressure polyethylene plastic bags, polypropylene plastic bags, polyvinyl chloride plastic bags, etc.
Classification by shape: vest bag, straight bag. Sealed bags, plastic bags, special-shaped bags, etc.
Features: light bags with a load of more than 1kg; medium bags with a load of 1-10kg; heavy bags with a load of 10-30kg; container bags with a load of more than 1000kg.
Food plastic packaging bags are often used in people’s lives, but you must be careful when using them. Some plastic packaging bags are toxic and cannot be used to directly store food.
1. Observation with eyes
Non-toxic plastic bags are white, transparent or slightly transparent, and have a uniform texture; toxic plastic bags are colored or white, but have poor transparency and turbidity, and the plastic surface is unevenly stretched and has small particles.
2. Listen with your ears
When the plastic bag is shaken vigorously by hand, a crisp sound indicates that it is a non-toxic plastic bag; and the small and dull sound is a toxic plastic bag.
3. Touch by hand
Touch the surface of the plastic packaging bag with your hand, it is very smooth and non-toxic; sticky, astringent, waxy feeling is toxic.
4. Smell with your nose
Non-toxic plastic bags are odorless; those with a pungent odor or abnormal taste are toxic.
5. Submersion test method
Put the plastic bag in the water, press it to the bottom of the water with your hand, wait for a while, the non-toxic plastic packaging bag that surfaced is the non-toxic plastic packaging bag, and the one that sinks to the bottom is the toxic plastic packaging bag.
6. Combustion method
Non-toxic plastic bags are flammable, the tip of the flame is yellow, and the tip of the flame is cyan. , the bottom is green, softening can be brushed, and you can smell a pungent smell
Post time: Feb-12-2022