tretorn tennis balls

tretorn tennis balls tion workers, construction equipment, good construction site refers to try to avoid cross-operation, because this is the last one item construction process. Not anxious at the moment, otherwise it will damage the surface of the material damage and work surface. If the flatness of the ground not up to standard, (whether within 2m straightedge whether the error is less than 2mm and check the ground from the shell from the sand, projected or recessed phenomenon ground, cracks, etc.). We must do in the surface layer of self-leveling. Silicon PUtennis ball field construction on the foundation of a number of specific requirements: 1, temperature: not less than 15 ℃. 2, surface roughness: by 2 m straightedge test, the gap should not be greater than 2mm. 3, the density of the surface: The surface should not be too rough, do not have too many pores. 4, cracks: Do not have a width greater than the crack of 3mm. 5, surface cleanliness:. Wax oil paint pigments and other residual material must be removed. 6, surface hardness: fast cut with a sharp chisel filing surface, there should be no marks or grooves. 7, the ground will not start sand.