MUMBAI, India, Aug. 10 -- Intellectual Property India has published a patent application (202641091656 A) filed by Indian Institute Of Technology Tirupati on July 28, 2026, for Fabrication Process For Ss 316l Powder Infused Polymer Extrusion Feedstock.
Inventors include Dr. Mamilla Ravi Sankar; and Tadi Siva Prasad.
The application for the patent was published on July 31, 2026, under issue no. 31/2026.
Abstract: ABSTRACT The present invention relates to a fabrication process for preparing an SS 316L powder infused polymer extrusion feedstock for subsequent filament extrusion in material extrusion-based metal additive manufacturing. The extrusion feedstock comprises stainless steel 316L powder dispersed within a multicomponent binder system comprising a hydrocarbon-based wax, an ethylene based polyolefin and a long chain hydrocarbon based saturated fatty acid compound, wherein the stainless steel 316L powder is present in an amount ranging from 80 wt.% to 90 wt.%. The fabrication process comprises feedstock preparation using a counter-rotating twin-screw extrusion system including physical mixing, melt compounding, primary extrusion and re-extrusion to obtain a homogeneous extrusion feedstock. Extrusion temperatures are selected using differential scanning calorimetry and a loss factor-based melt rheological framework to establish an operating window of 110 °C to 120 °C. Thermogravimetric analysis validates the solid loading and provides decomposition information useful for thermal debinding.
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