Method for making foamed shoe material

A method for making foamed shoe material comprising:

• step of picking material:
• taking a total weight of materials as 100 wt %, providing 25 wt % to 65 wt % recycled polyethylene terephthalate (r-PET), 30 wt % to 70 wt % ethylene vinyl acetate copolymer (EVA), and 2 wt % to 10 wt % compatibilizer;
• wherein the r-PET is a recycled material made from recycled polyethylene terephthalate (PET) bottles, and the compatibilizer is a polymer material or a grafted polymer material with epoxy content ranging from 3 mol % to 16 mol %;
• step of melting:
• using a weightless metering system, the EVA, compatibilizer, and PET are proportionally and respectively fed to form a polymer alloy, extruding, by a twin-screw extruder at a temperature of 160° C. to 245° C. and an average shear rate of 100/sec to 300/sec, the polymer alloy into strips at a rate of 100 kg/hr to 250 kg/hr, while controlling the screw within the aforementioned temperature range during the extruding process of the polymer alloy, starting from feeding process, and heating the polymer alloy from temperature of 160° C. to 245° C., and then cooling it down to less than 240° C. during the process of extruding the polymer alloy with the twin-screw extruder;
• step of semi-finished product strip drawing:
• controlling the twin-screw extruder to draw out the polymer alloy strip that has been extruded into strips, and guide the polymer alloy strips to cool through a water channel;
• step of cutting and granulation:
• controlling the twin-screw extruder to cut the cooled polymer alloy strips into granules and then vibrating-sieving to get PET composite masterbatch;
• and
• step of foam molding:
• mixing the PET composite material masterbatch with EVA and an elastic material, injecting the mixture into a foam mold cavity, and obtaining the foamed shoe material by foam molding.