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1. Material extrusion
The principle is to use a moving extrusion head to locally deposit a filament of plastic or composite material. Heated to several hundred degrees, the extruded material, in semi-solid form, adheres to the surfaces in contact and rapidly solidifies. The material is first deposited on a printing plate regulated at a temperature of the order of a few tens of degrees to form a first layer. The next step is to deposit filament again on top of the previous layer, as illustrated in figure 1 . By iteration, the accumulation of superimposed layers gives shape to the part. The raw material used is either wire or granules. At the end of the printing process, the part is separated from the printing plate and can undergo further...
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Material extrusion
Material projection
Bibliography
Standards and norms
- Additive manufacturing – Design – Requirements, guidelines and recommendations. - NF EN ISO/ASTM 52910 - Mars 2020
- Additive manufacturing – Safety, health and environment – Requirements for metallic materials. - XP E67-006 - Juillet 2020
Regulations
Council Directive 89/391/EEC of June 12, 1989 on the introduction of measures to encourage improvements in the safety and health of workers at work (OJEC L. 183 of June 29, 1989, CELEX :31989L0391).
Directive 2014/34/EU of the European Parliament and of the Council of February 26, 2014 on the harmonization of the laws of the Member States concerning equipment and protective systems intended for use...
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