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Waste plasticsAs you know, a large number of plastics used in food packaging, there are three: polyvinyl chloride, polyethylene, polystyrene. Short period of time for holding cooking oil on human health is not impeded. However, long-term use them to dress cooking oil can contaminate food and cause harm to human body.This is because this type of bottles with high transparency, easy to aging and other characteristics will be in the air of oxygen, ozone, ultraviolet light produce strong odors, plus polyethylene compounds itself aging, if used for long-term storage of oil, easy to make the deterioration of food supplies.In addition, PVC vinyl chloride in the elements not only toxic but also in acids and fats break down very easily precipitated highly toxic hydrogen chloride and chlorine, polyvinyl chloride added plasticizers, such as phthalic acid esters, are toxic, and used as a stabilizer of lead, cadmium and organic tin are toxic chemicals, toxicity are large and easy to dissolve in fats. Although it is of low toxicity polystyrene plastic material, but its composition volatile components ethylbenzene and styrene, cumene are poisonous, and very easy to dissolve in fats and oils. Polyethylene plastics is not toxic. However, after it comes in contact with oil, can break molecular compound precipitated, these fat-soluble low molecular elements can be toxic.Forming principlePlastic bottles are filled by the mold of the gun after a certain temperature under a pressure of blow molding, the preform may be formed by machining, it can also be formed directly from an injection blow molding machine processing.
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