Dust-free chalk

technical field [0001] The invention belongs to the manufacturing technology of stationery chalk. Dust-free chalk should be called micro-dust chalk scientifically. Background technique [0002] The teacher writes on the blackboard with chalk on the blackboard during class, and the chalk dust flies, seriously affecting the health of the teacher. [0003] In recent years, a new product of "dust-free chalk" has appeared abroad, which has generated strong repercussions in the education sector and has been highly valued. In fact, from a scientific point of view, absolute dust-free chalk is impossible, because chalk blackboard writing is covered by dust to present handwriting, so the meaning of dust-free chalk means that its dust content is higher than that of ordinary chalk. volume is greatly reduced. In order to achieve the purpose of improving the working environment of teachers and benefiting the health of teachers and students. At present, my country has only a few areas ...