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Duplex board with grey back coated with a high surface brightness, smoothness, Ink absorption and print gloss are good, cardboard itself has good stiffnessand folding.
Duplex Board
Item | Unit | Standard | 250GSM | 300GSM | 350GSM | 400GSM | 450GSM |
Basis Weight | g/m² | GB/T451 | ±3% | ±3% | ±3% | ±3% | ±3% |
Caliper | um | GB/T451 | 300±20 | 360±20 | 420±20 | 485±20 | 545±20 |
Moisture | % | GB/T462 | 7.0±2 | 7.0±2 | 7.0±2 | 7.0±2 | 7.0±2 |
Brightness | % | GB/T7974 | ≥76 | ≥76 | ≥76 | ≥76 | ≥76 |
Roughness (1000cpm) | um | GB/T456 | ≤1.5 | ≤1.5 | ≤1.5 | ≤1.5 | ≤1.5 |
IGT | m/s | GT/T7540 | ≥1.0 | ≥1.0 | ≥1.0 | ≥1.0 | ≥1.0 |
Stiffness(CD) | mN.m | GB/T22364 | ≥2.5 | ≥4.0 | ≥6.0 | ≥9.0 | ≥12.0 |
Cobb (Front) | g/m² | GT/T1540 | ≤50 | ≤50 | ≤50 | ≤50 | ≤50 |
Cobb (Back) | g/m² | GT/T1540 | ≤120 | ≤120 | ≤120 | ≤120 | ≤120 |
Gloss | % | GB/T456 | ≥35 | ≥35 | ≥35 | ≥35 | ≥35 |
K&N | % | GT/T8620 | 3-14 | 3-14 | 3-14 | 3-14 | 3-14 |
Duplex board with grey back coated with a high surface brightness, smoothness, Ink absorption and print gloss are good, cardboard itself has good stiffnessand folding.
Duplex Board
Item | Unit | Standard | 250GSM | 300GSM | 350GSM | 400GSM | 450GSM |
Basis Weight | g/m² | GB/T451 | ±3% | ±3% | ±3% | ±3% | ±3% |
Caliper | um | GB/T451 | 300±20 | 360±20 | 420±20 | 485±20 | 545±20 |
Moisture | % | GB/T462 | 7.0±2 | 7.0±2 | 7.0±2 | 7.0±2 | 7.0±2 |
Brightness | % | GB/T7974 | ≥76 | ≥76 | ≥76 | ≥76 | ≥76 |
Roughness (1000cpm) | um | GB/T456 | ≤1.5 | ≤1.5 | ≤1.5 | ≤1.5 | ≤1.5 |
IGT | m/s | GT/T7540 | ≥1.0 | ≥1.0 | ≥1.0 | ≥1.0 | ≥1.0 |
Stiffness(CD) | mN.m | GB/T22364 | ≥2.5 | ≥4.0 | ≥6.0 | ≥9.0 | ≥12.0 |
Cobb (Front) | g/m² | GT/T1540 | ≤50 | ≤50 | ≤50 | ≤50 | ≤50 |
Cobb (Back) | g/m² | GT/T1540 | ≤120 | ≤120 | ≤120 | ≤120 | ≤120 |
Gloss | % | GB/T456 | ≥35 | ≥35 | ≥35 | ≥35 | ≥35 |
K&N | % | GT/T8620 | 3-14 | 3-14 | 3-14 | 3-14 | 3-14 |