factory teach you check stone material surface defects under the condition of the light is enough, sheet will be flat on the ground, standing on the distance of observation is not seen where the solid surface
sheets for sale plank purlin defects that no defects;
Standing on the sheet of purlin is visible in the purlin in no obvious flaws as no obvious flaw;
Standing in the sheet from the purlin clearly see defects that is flawed.
Specific observations the defects of plate buckling;
Plate surface crack, sand holes, different flecks, stain and concave phenomenon exists.
If determine the above several defects without the plate as the classy article, at the same time sheet is not allowed to have lack of positive edge drop Angle defect;
If the above defect is not obvious at the same time also no obvious lack of edge Angle, then can maintain the plank for level 1;
If there were a few defects, but does not affect the use, only 1 sheet and positive director is not more than 8 mm, width is not more than 3 mm short or long and wide edges are not greater than 3 mm off Angle, can judge the plank for qualified products.
Plate and damaged during transportation, loading and unloading, can undertake bonding (
Against rupture board)
Or repair (
On edges and potholes or pitting) on the surface of the defect,
But felt, repair after positive there is no obvious trace, color to color close to positive.
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