pe: The main raw material for the production of plastic barrels is polyethylene (PE), referred to as PE. It is a high molecular organic compound made by addition polymerization of ethylene. Polyethylene is recognized as the best material in contact with food in the world. It is non-toxic, tasteless and odorless, and meets food packaging hygiene standards. pp: Polypropylene (Polypropylene PP) is a high polymer. The monomer is propylene CH2=CH-CH3. Polypropylene is obtained through addition polymerization. The chemical formula can be expressed as (C3H6)n, and the structural formula can be expressed as 〔－ CH2－CH(CH3)－]n. The full English name is: Polypropylene PP has a typical molecular structure of regular main body and is a crystalline polymer.
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