Open the outer packaging of the paper cup and smell the smell of the paper cup. The qualified paper cup should have no smell. Unqualified paper cups, such as industrial paraffin, are not food grade, but non-food grade recycled PE, there may be some unstable low molecular components freed, releasing odor, if dressed Hot water, etc., odor may be more obvious, such a situation should be treated with care.
National standards have cup body stiffness and cup bottom strength requirements for paper cups. The paper cup is very soft and slightly flattened. It may be a product that cuts corners and is not easy to use. It is easy to use this paper cup to get hot water and cause accidental injuries such as burns.
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Fluorescent whitening agents are not allowed in paper cups. Some illegal products are made of recycled paper, and the whiteness is not enough. Add fluorescent whitening agent to use as raw pulp paper. Although there is currently no evidence that the absorption of fluorescers can cause harm to humans, fluorescers have been listed as one of the potential carcinogenic factors. If it contains a fluorescent substance, it will emit blue fluorescence when it is irradiated with ultraviolet light. Consumers can use this principle to perform preliminary verification using a counterfeit pen that emits ultraviolet light. Although the fluorescent agent does not penetrate and migrate into the food quickly in the presence of the coating, there is still a potential hazard. According to the standard, if the area of the cup emitting more than 5% of the fluorescent material is a defective product.