RECYCLE TECHNOLOGY OF USED PLASTIC MATERIALS

摘要

This paper describes the recycle technology of used plastic materials such as waste high-density polyethylene (HDPE) films and containers, waste caps for polyethylene terephthalate (PET) bottles, and used PET bottles with caps and films. The fusion joining strength of extruded sheets of waste HDPE films and containers using a compatibilizer was firstly studied. The dumbbell specimens cut out from sheets were fused at different temperatures. It was found that the tensile strength of the fusion joining part of HDPE films and containers with a compatibilizer was stable at 160 degrees C or less. A compounding technology of waste only caps for PET bottles, and used PET bottles with caps and films using a compatibilizer was secondly studied. When compatibilizers were mixed to waste only caps for PET bottles, it was found that the elongation at breakage of a compound was increased although the tensile strength was slightly decreased. The recycle compound of Cap 100% and a compatibilizer is now commercialized for a material of plastic corrugated cardboard boxes. Some compounds of PET flakes, polyethylene (PE) and polypropylene (PP) for caps, and polystyrene (PS) for films with compatibilizers were extruded, the mechanical properties of them were also discussed.