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Multi-Material 3D Printing Improved with Novel Extruder https://ift.tt/2DNCuCy Multi-material 3D printing is becoming more common with newer 3D printers, but there are still challenges in getting the layers of multiple materials to adhere properly. In a paper entitled “Enhanced Bonding of Immiscible Polymers via Intermixed Co-extrusion in Fused Deposition Modeling,” a pair of researchers describe a method designed to improve the bonding strength of parts 3D printed with dissimilar materials.
The tri-extruder head has four main components: two guideways, a split melt chamber and a nozzle. The guideways have a heat sink that ensures that the filaments do not reach a temperature above their glass transition temperature.
The tri-extruder was installed on a Geeetech 3D printer. To turn on the intermixing, a static helical intermixer is inserted into the nozzle which is then screwed to the melt chamber. When the molten polymers flow through the intermixer, they mix by chaotic advection. ABS and HIPS were used as the materials for the study. The tensile strengths of the side-by-side printed parts and the intermixed parts were indistinguishable, showing that intermixing does not have any adverse effect on mechanical strength. However, the side-by-side printed parts split after tensile tests while the intermixed parts cracked uniformly across the cross section.
The results suggest that the intermixing may result in higher mechanical strength, as long as all other parameters are kept the same. Future work will include further mechanical tests and the 3D printing of functionally graded materials. Authors of the paper include Mohammad Abu Hasan Khondoker and Dan Sameoto. Discuss this and other 3D printing topics at 3DPrintBoard.com or share your thoughts below.
Printing via 3DPrint.com | The Voice of 3D Printing / Additive Manufacturing https://3dprint.com November 19, 2018 at 11:57AM
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