Fused deposition type 3D printing method based on biopolymer prefabricated bar

Abstract

The invention discloses a fused deposition type 3D printing method based on a biopolymer prefabricated bar. According to the novel printing method, the biological prefabricated bar and a specially-made printing spray head are effectively combined. The structure principle is simple, operation is convenient, and the customized biological prefabricated bar with the higher degree of freedom can be manufactured. In subsequent application, the excellent performance of organic polymeric materials is maintained while smooth pushing, fusing and extruding of the bar are guaranteed, and pollution and waste of the biomedical polymer materials in the actual printing process are effectively avoided.

Description

Technical field [0001] The invention belongs to the technical field of biomedical engineering, and relates to a new printing method that effectively combines biopolymer prefabricated rods and cooling printing nozzles, which ensures the smooth advancement of the rods in melting and extrusion while maintaining the superior performance of the organic polymer material itself, and quantifies The bar design effectively avoids the contamination and waste of biomedical polymer materials in the actual printing process. Background technique [0002] 3D printing technology (also known as 3D rapid prototyping technology or additive manufacturing technology) is a new type of manufacturing technology, which refers to the computer-aided design (CAD) model or computer tomography (CT) data and other data under computer control , Through the accurate 3D accumulation of materials, a new digital molding technology that quickly produces 3D objects of arbitrary complex shapes. At present, 3D printing...

AI Technical Summary

Problems solved by technology

The production cost of wire is low and the processing performance is good, but its wire is easily softened and expanded by heat, which blocks the feed throat and affects continuous and stable printing; the prior art utility model patent (application number: 201620025599.9) discloses a fused deposition type 3D The cooling print nozzle of the printer, this design ensures the smooth advancement and melting extrusion of consumables, and improves the smoothness of printing

However, in the actual clinical application of FDM, there are still problems such as printing consumables are susceptible to moisture and oxidation, which will directly affect the quality and performance of molded parts. Problems such as material pollution and waste are still unresolved; in addition, another granular feed nozzle device appears in the scaffold fabrication process in the field of tissue engineering, which uses a cylindrical barrel to heat thermoplastic pellets to melt and maintain a constant melting Under high temperature, the molten material is quantitatively extruded from the nozzle by air pressure or screw. This feeding method has a wide range of forming materials and high printing accuracy, but the pellets need to be completely heated and melted in the barrel before being extruded, which is not only easy to cause material hanging The wall phenomenon, and long-term heating at high temperature can easily cause molecular bond breakage, material degradation, and seriously affect the good performance of polymer materials

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