However, if the selected material is not good or the processing technology is not good enough, the polyethylene may be oxidized to carbonyl compounds during the process of hot melting or applying to the paper cup. Carbonyl compounds are not volatile at room temperature, but when hot water is poured into a paper cup, they may volatilize, so people will smell strange smells. From a general theoretical analysis, long-term intake of this organic compound must be harmful to the human body.

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