JIS K 6821:2020规定了3D打印机用聚乳酸长丝（以下简称PLA长丝）中标称PLA长丝直径为1.75 mm的PLA长丝的材料特性（根据材料挤压工艺1）。本标准不适用于乳酸聚合物含量质量分数小于50%的PLA长丝。

JIS K 6821:2020 specifies the material characteristics of the PLA filaments of a nominal PLA filament diameter of 1.75 mm among polylactic acid filaments (hereafter referred to as PLA filaments) for 3D printers according to the material extrusion process 1). This Standard does not apply to the PLA filaments of which the lactic acid polymer content has a mass fraction of less than 50 %.