The purpose of this paper is to present a new 3D printing method called Selective Laser Baking (SLB) to fabricate 3D parts with Poly Vinyl Chloride (PVC) material. The Mid Power Lasers are used at the SLB method for heating and shaping to PVC layers by laser scanning on the surface of the PVC compound. After designing a 3d model on the computer, transforming it into two-dimensional(2D) layers on common software, and controlling the laser scanning system by a computer, the pattern of each layer is constructed on the surface of PVC compound and layers are sequentially built on each other until a 3D part is made from PVC material. The most common method for producing PVC parts is molding. Fabrication of Customized PVC parts is always a challenge. 3D printing can be used to overcome this drawback. Despite the existence of a simple material extrusion 3D printing technique, this technique does not provide acceptable resolution and lead time.
This article presents the experimental investigation of the ability of a novel technique called Selective Laser Baking(SLB) to fabricate 3D printed micro-optics with Polydimethylsiloxane (PDMS), which has numerous applications due to its characteristics. SLB is a direct writing laser method that uses the thermal effect of a laser beam to fabricate 3D parts. In this method, absorption of the laser heats the emitted locations; increasing the temperature accelerates the hardening procedure and causes the PDMS mixture to get hard immediately. This fabrication technique is a unique method that contributes to fabricating 3D print with two-based thermoset polymers. In addition to analyzing the laser beam heat transfer in PDMS with COMSOL Multiphysics, multiple two and three-dimensional experiments were performed to investigate the optimal printing parameters. Experimental results have shown the ability of the SLB 3D printing method to fabricate microstructures such as micro-optics and microfluidics.
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