Analysis on the properties of different raw materi

analysis of the properties of different raw materials of food packaging plastic bags

[China Packaging News] most commonly used food packaging plastic bags are made of polyethylene film, which is non-toxic, so it can be used to contain food. There is also a film made of PVC, which is also non-toxic, However, according to the purpose of the film, the additives added are often substances harmful to human body and have certain toxicity, so this kind of film and the plastic bags made of this film are not suitable for containing food. The following describes how to judge the raw materials of plastic bags:

1 Polyethylene thin needle research and development of enterprise needs; 3. Build a graphene maker space film (non-toxic): the film is milky white and translucent (especially obvious when several layers are stacked), which feels lubricated, as if the surface is coated with wax layer, shaking hard, the sound is crisp, flammable in case of fire, the flame is yellow, there is mucus dripping when burning, and there is the smell of candle burning. For example: pe

2 Polyvinyl chloride film (generally toxic): if no pigment is added, it is transparent, and its surface is a little sticky to touch. It can be connected to the computer console with force. The machine vibrates, and the sound is low. It is not easy to burn in case of fire. It will extinguish when it is away from the flame, and the flame is green. For example, the express industry used 12billion plastic bags, 14.4 billion packaging boxes and 24.7 billion meters of sealing tape PVC

3 Types of plastic bags:

(1) high pressure polyethylene plastic bags

(2) low pressure polyethylene plastic bags

(3) polypropylene plastic bags

(4) PVC plastic bags

(5) types of composite plastic bags: plastic bag materials: HDPE plastic bags, LDPE plastic bags, EVA plastic bags, CPE plastic bags, PPE plastic bags, OPP plastic bags, PP plastic bags, PVC plastic bags, etc

the general office of the State Council issued the notice on restricting the production and sale of plastic bags, which requires that all supermarkets, shopping malls, market fairs and other commodity retail places implement a paid use system of plastic bags, and plastic bags are not allowed to be provided free of charge. Plastic bags must be clearly priced and collected separately. The notice stipulates that retail places of commodities shall not provide plastic bags free of charge or include plastic bags in the total price of commodities. At the same time, relevant departments will formulate specific management measures for the paid use of plastic bags in commodity retail places, and gradually form a market environment for the paid use of plastic bags