Types of recycling processing to be carried out.

Information about a recycling machine item is input. A first sorting condition is prepared so as to sort the recycling machine into one of a plurality of groups corresponding to conditions for decomposing the recycling machine. A second sorting condition is prepared so as to sort recycling parts , which are obtained by decomposing the recycling machine sorted out. Into at least one of a plurality of material groups corresponding to material of each of the recycling parts . A third sorting condition is prepared so as to sort the recycling parts sorted out according to the second sorting condition, into at least one of a plurality of processing groups corresponding to types of recycling processing to be carried out. Finally, the first, second, and the third sorting conditions are transmitted to respective fields where the recycling machine and the recycling parts are sorted.

A pipe extrusion line assembly for extrusion of a triple walled (plastic / metal / plastic) pipe includes a first extrusion apparatus. For extruding an inner plastics layer of the pipe, having an extruder with a coaxial outer extrusion sleeve and inner extrusion die. A shaping sleeve surrounding and substantially coaxial with the extruder, which shaping sleeve is capable of shaping a U-section form metallic layer passing through it into a tubular configuration and a welder for welding the metallic layer of tubular configuration to provide a metal tube. A conduit for supplying a pressurized gas internally of the pipe whereby extruded plastics material emerging from the first extrusion apparatus is forced against an internal surface of the metal tube. And a second extrusion apparatus, for extruding an outer plastics layer of the pipe, having a body part and a supply channel within the body part for supplying plastics material. Which extrusion assembly has at least one of, an essentially annular section recess in the body part of the second extrusion apparatus capable of receiving an end of the shaping sleeve, thus allowing accurate positioning of the shaping sleeve relative to the first and second extrusion apparatuses. And a universal joint to which the extruder of the first extrusion apparatus is operatively connected, which connection is adjustable to allow accurate positioning of the exit orifice of the first extrusion apparatus relative to the exit orifice of the second extrusion apparatus.

And foreign plastic recycling machine having specific gravity smaller than water . A depolymerization process for producing bis-β-hydroxyethyl terephthalate (BHET) by charging recovered PET flakes into ethylene glycol containing a PET depolymerization catalyst and treating the mixture at a temperature of 175-190 ° C. under a pressure of 0.1-0.5 MPa. A solid-liquid separation process for removing solid foreign materials which have not dissolved in the above reaction solution . A concentration process for distilling and concentrating a solution fraction which has passed the solid-liquid separation process . An ester interchange-recrystallization process for forming crude dimethyl terephthalate (DMT) and EG through an ester interchange reaction of the concentrated BHET in methanol (MeOH) in the presence of an ester interchange reaction catalyst, and subjecting the reaction mixture to recrystallization in a MeOH solvent. A distillation process for removing MeOH by distillation from the crude DMT to purify the DMT . A hydrolysis process for subjecting the purified DMT obtained in the DMT distillation process to a hydrolysis reaction together with water which is supplied in an amount 0.5 to 5 times the weight of the DMT at a temperature of 230-250 ° C. to produce terephthalic acid. A process for cooling an aqueous slurry of the TA obtained in the hydrolysis process. A process for obtaining TA cakes from the cooled aqueous slurry of TA through solid-liquid separation. A slurry adjusting process in which the TA cakes obtained in Process are added to a slurry preparation tank after the TA cakes are dried. A process in which TA cakes and EG are made to perform an esterification reaction to obtain a PET oligomer.

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A hydrolysis process for subjecting the purified DMT obtained in the DMT distillation process to a hydrolysis reaction together with water which is supplied in an amount 0.5 to 5 times the weight of the DMT at a temperature of 230-250 ° C.