The plastic resin is obtained as a polymer by a reaction of addition polymerization, polycondensation, etc., and in the production process of the resin (that is, during the reaction of the polymerization of the monomer into the polymer resin), the waste can be generally produced by the following factors.

1. Waste is generated when the synthetic resin grade is replaced; the polymerization of the monomer is usually carried out continuously in the reaction vessel. When the grade of the synthetic resin is replaced, the resin polymerized between the two grades is replaced by the first and last grades. The composition of this resin is called transition material, ie waste.

2. Produce low molecular weight by-products during polymerization; in the polymerization, in addition to the original design requirements to synthesize the resin with the original structural parameters (such as average molecular weight, molecular weight distribution, crystallinity, stereoregular content, etc.), will also produce Low molecular weight by-products, such as oligomers produced in synthetic polypropylene.

3. Synthetic conditions and raw material factors produce waste; changes in synthesis conditions or sudden changes in synthetic raw materials during the reaction of the polymer from the monomer to the high polymer may result in waste resin that does not meet the quality requirements, or due to improper raw material ratio , resulting in low molecular weight of the polymer, can not meet the quality requirements of the waste.

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