Production process for manufacturing food-level polyester bottle flakes utilizing polyester recovered bottles

Abstract

This invention discloses a production technology for producing the food-grade polyester bottle slices by utilizing the restored polyester bottles. According the characteristics of restored PET bottle, the restored polyester bottles were washed firstly and pulverized to slices, then the PVC bottle bodies, the volume labels, the impurities and the foreign materials were wiped off. Secondly, according the species of the residuum, the removing technology of the corresponding trace impurity was used. So the trace impurities of PVC, PP, PE and the other mechanical impurities can be removed again. The residuum of the restored PET bottle can be cut down greatly. Finally, the solid phases were condensed together so as to obtain the food-grade polyester bottle slices. Because of using the restored polyester bottles, the production cost is low, and the production technology meet the circulating economical development idea which advocated by the country nearly. The quality of the reproduction accords with the national standards of the food-grade PET bottle. The foreign exchange of the production technology is high and the economic effects as well as the social effects are obvious.

Description

【Technical field】 [0001] The invention relates to a production process of polyester bottle flakes, in particular to a production process of producing food-grade polyester bottle flakes from recycled polyester bottles. 【Background technique】 [0002] PET (polyester) is the main chemical fiber raw material. Because of its superior physical properties, PET has wider and higher value-added applications in packaging materials. Edible packaging sheets and edible beverage bottles are practical examples. [0003] Based on the two issues of concern to all mankind, environmental protection and natural resource conservation, the recycling process of used PET bottles has been sprouting since the 1970s. The recycled bottle flakes produced in the early stage started from meeting the demand for short fiber raw materials. The improvement and development of the continuous process are all moving towards reducing the retention rate of impurities. The total impurity rate has changed from the e...

AI Technical Summary

Problems solved by technology

But it is impossible to pass the checkpoint of food hygiene inspection because of trace chemical residues that cannot be detected visually

This type of residue is not limited to the surface of bottle flakes from the perspective of analysis, because PET has the surface characteristics of tiny capillary pores, and small molecular weight organic substances have the opportunity to penetrate into the inner layer of PET, and these substances that penetrate into capillary pores cannot be removed by mechanical cleaning

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