1results about How to "Spread powder evenly" patented technology

This invention proposes a spherical polylactic acid (PLA) powder with a wide sintering window, its preparation method, and its application. The preparation method includes the following steps: S1, mixing a poor solvent and PLA granules, adding the mixture to a reaction vessel, stirring, first heating, then holding at that temperature; S2, then cooling to 100-118°C, holding at that temperature for 30-60 minutes; S3, removing the product, washing and drying the product to obtain the spherical PLA powder. This invention is based on thermally induced phase separation, adding a spheroidization step to increase the crystallinity and sphericity of the PLA powder. The prepared spherical PLA powder has a particle size distribution of 10-120 μm and a bulk density of 0.3-0.45 g / cm³. 3 The powder possesses high fluidity, a wide sintering window, and excellent sintering performance, while retaining the excellent greenness and biocompatibility of polylactic acid. PLA parts formed by LPBF printing using the spherical PLA powder prepared in this invention exhibit good mechanical properties.