Method for producing a supply obtained from the recycling of plastic material of industrial and post-consumer residues, to be used by 3d printers

Abstract

A process uses a starting material including recycled post-consumer and industrial “scrap” thermoplastics based on polyester and polyamide, where a supply is obtained suitable for 3D printing/additive manufacturing/rapid prototyping with “Fused Deposition Model” (FDM), “Fused Filament Fabrication” (FFF) and similar technologies. The supply can have the form of a solid filament suitable to be used by “3D” printers, or it can form a pulverulent material to be used in more sophisticated printers, such as those with SLS technology. This method includes a series of first stages that consist of: a) Selecting the starting material which was originally produced by one of the processes of transformation; b) starting material is duly cleaned; c) once it is cleaned, the material is dried at temperatures greater than 100° C. but less than 240° C.; d) the material obtained thereof is driven into an extruder machine where it is subject to temperatures between 200° C. and 350° C. from the head to the dosing zone to be pelletized; e) the addition of additives to the material may occur in the feed zone in order to grant distinctive physicochemical properties to the end product, such as color, hardness, erosion strength, etc. f) from the material resulting from the previous stage either a plastic filament is created by using a single screw extruder and is placed in a spool, or a pulverulent material is created. The supply obtained from the previous stages is subject to an additional heat treatment by varying the process temperature between 100° C. and 240° C., during a processing time varying between 1 minute and 24 hours. The starting material consists of plastic post-consumer items or industrial scrap made of polyethylene-terephthalate (PET) and polyamide (PA). The additional heat treatment varies the process temperature between 100° C. and 180° C. in the case of polyamides (PA) and between 100° C. and 240° C. in the case of polyethylene-terephthalate (PET).

Dependencies are inferred from the claim text.