No. Item A grade B grade C grade D grade E grade 01 Grain Regular straight grain, mountain grain Regular straight grain, mountain grain, half straight grain Straight grain, mountain grain, half straight grain Straight grain, mountain grain, messy grain No limited 02 Live knots φ≤8mm, 2pcs, color natural φ≤15mm, 2-5pcs, color natural φ≤60mm, spitting, color closely Allowed, width≤ 1/3 width of flooring Allowed, width≤ 1/3 width of flooring 03 Dead knots Not allowed φ≤5mm, 1-2pcs, spitting, color closely φ≤20mm, 1-3pcs, spitting, color closely φ≤40mm, 2-4pcs, spitting, color closely φ≤60mm, spitting, color closely 04 Pin knots Single spitting, overall color closely Small, spitting, color closely allowed Spitting, color closely allowed Spitting, color closely allowed Spitting, color closely allowed 05 Side knots Not allowed Not allowed Allowed no drop, no cracking, not allowed dead knots Allowed no drop, no cracking, not allowed dead knots Allowed no drop, no cracking, not allowed dead knots 06 Holes Not allowed φ≤1mm, 3-5pcs, spitting, not color changed φ≤1mm, spitting, not color changed φ≤1mm, spitting, not color changed φ≤1mm, spitting, not color changed 07 Black Lines Not allowed Not allowed 1*100mm, 1-3lines, spitting 3*200mm, 3-5lines, spittng 3*200mm, 3-5lines, spittng 08 Pollution if the surface can be sanded allowed, oil not allowed if the surface can be sanded allowed, oil not allowed if the surface can be sanded allowed, oil not allowed if the surface can be sanded allowed, oil not allowed if the surface can be sanded allowed, oil not allowed 09 Splits Not allowed Not allowed 3*300mm, 1-2lines, seams not allowed 5*300mm, 1-2lines, seams not allowed 8*600mm, 1-3lines, seams not allowed 10 End Oxidation Not allowed Not allowed Allowed a slight, but the color closely Allowed color closely, but the width≤1/4 of flooring width, sq.m≤5% Allowed color closely, but the width≤1/4 of flooring width, sq.m≤5% 11 Sub wood Not allowed Allowed a slight Allow only one side, the width≤15% of flooring width Allow only one side, the width≤20% of flooring width Allow only one side, the width≤30% of flooring width 12 color difference Not allowed Allowed a slight Coordination allowed Coordination allowed Coordination allowed 13 Discoloration Not allowed Not allowed Allowed slight natural discoloration, not allowed blue/yellow stained fungus Allowed slight natural discoloration, not allowed blue/yellow stained fungus Allowed slight natural discoloration, not allowed blue/yellow stained fungus 14 Bark Pocket Not allowed Not allowed 2*30mm, 1 line 4*40mm, 3 lines 5*60mm, 3 lines 15 Watermark, spacer mark Not allowed Not allowed Not allowed Not allowed Not allowed 16 Decay Not allowed Not allowed Not allowed Not allowed Not allowed 17 Broken grain Not allowed Not allowed Not allowed Not allowed Not allowed 18 Tabby grain Not allowed Not allowed Allowed st...
Exposed to moisture for an extended period of time, bamboo flooring products can absorb moisture and weaken. Because bamboo is grass, the grain runs the length of the board. Inferior or inappropriate bamboo selection, the use of bamboo that is either harvested too young or not properly dried can be prone to changes in temperature and humidity. This can lead to cupping, warping and swelling of the material. Reason 1. Uneven distribution of floor moisture content 2. The floor is slotted on one side and not slotted on the other. The two sides of the floor are not the same as the air contact area, and the degree of water absorption is different, resulting in different moisture content on both sides of the floor. In the case of high air humidity, there is less water in the air without the slotting side, and the side of the back slot absorbs more water in the air, expanding the face surface of the back slot, but the surface of the plane does not expand, so the floor will bend like that of the plane. In the case of air drying, on the contrary, the board will bend like a slotted side. ▶▶ Solutions 1. In production: When health balance, drying should not be too fast, drying kiln to keep the temperature uniform; Try to make sure that both sides of the floor have the same texture 2. How to avoid before installation Proper expansion joints reserved for paving 3. After installation Because the weather humidity changes with the season, you can see if the floor will recover in a few months. If it is still tile, you can only replace the floor
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