Blackboard writing block

Abstract

The invention provides a blackboard writing block comprising a blackboard writing layer. The blackboard writing layer is provided with a plurality of concave hole lines. Extending directions of all the concave hole lines are parallel. A convex strip is arranged between every two adjacent concave hole lines and comprises a plurality of first convex blocks. A plurality of concave holes are formed inthe concave hole lines. The center lines of the same line of concave holes are collinear. The areas of the concave holes are equal. A second convex block is arranged between every two adjacent concave holes. The areas of the end faces of the first convex blocks are equal to those of the end faces of the second convex blocks. The structure is adopted, the concave holes of the blackboard writing layer are arranged in order, the contact area of the ordered concave holes and a chalk can also be increased, friction force is increased, slipping is avoided, the contact area of each concave hole andthe chalk is increased, thus the chalk left in the concave holes is more and more uniform, the heaviness feeling of blackboard writing is increased, and the blackboard writing is clearer and more distinct.

Description

technical field [0001] The invention relates to the field of teaching supplies, in particular to a writing block. Background technique [0002] At present, in order to reduce dust pollution in the classroom, ordinary chalk is gradually replaced with water-soluble chalk. However, the powder of water-soluble chalk left on the blackboard by blackboard writing is wiped with a water-soaked blackboard eraser, but continues to be written on the blackboard after wiping with water. , as the water droplets fill the small depressions on the blackboard, turning the blackboard into a bright surface, no more chalk powder remains on the blackboard, and the students can see that the wiped parts on the blackboard are very bright, so that students cannot clearly It can be seen that the blackboard writing on the blackboard affects the learning of the students, and the blackboard writing on the blackboard is prone to slipping after being wet. If the blackboard is matted before use, the depress...

AI Technical Summary

Problems solved by technology

[0002] At present, in order to reduce dust pollution in the classroom, ordinary chalk is gradually replaced with water-soluble chalk. However, the powder of water-soluble chalk left on the blackboard by blackboard writing is wiped with a water-soaked blackboard eraser, but continues to be written on the blackboard after wiping with water. , as the water droplets fill the small depressions on the blackboard, turning the blackboard into a bright surface, no more chalk powder remains on the blackboard, and the students can see that the wiped parts on the blackboard are very bright, so that students cannot clearly It can be seen that the blackboard writing on the blackboard affects the learning of the students, and the blackboard writing on the blackboard is prone to slipping after being wet

If the blackboard is matte treated before use, due to the irregular depressions on the blackboard, it is difficult to clean after writing on the blackboard. If the residue of water-soluble chalk remains in the depression of the blackboard, the content of the subsequent blackboard writing will still not be clearly visible

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