The grinding quality of rubber knives (including knife edge, chisel, knife chest, knife wing and knife body) is comprehensively evaluated and graded. Usually divided into three levels for evaluation. The basic requirements of a good glue knife: the blade is neat and sharp; The chiseled inclined plane is smooth and uniform; The knife chest is small and round, straight and smooth, with the same thickness before and after; The wings are smooth, and the blade is smooth inside and outside.

Rubber worker classification

Comprehensive evaluation of rubber workers' tapping skill level. Usually divided into one, two, three and four levels. The content of comprehensive evaluation includes 10 of stump evaluation.