RECOVERY OF POLY(ETHYLENE-TEREPHTHALATE) (PET) FROM USED X-RAY-FILM .1. A REVIEW OF CURRENT PROBLEMS AND A CHEMICAL METHOD FOR RECOVERY OF SILVER AND PET

Current methods for the recovery and recycling of poly(ethylene tereph thalate) (PET), from used X-ray and lithographic films, are described. The principal problems involving initial separation of silver, poly(v inylidene chloride) (PVDC), gelatin, adhesive tape and paper are descr ibed, prior to recovery of PET. Structures and physical properties of PVDC and PET are described, and chemical methods for the recovery of s ilver and PET and techniques for the removal of paper and adhesive tap e are given. Quality assessment of recovered PET is by determination o f key physical and mechanical properties. Emphasis is placed on the ne cessity of recovery material of adequate purity, at economical cost, f or commercial use.