1- VISUAL PROPERTIES
- Paper has good and even formation, without cloudy appearance in look through.
- Optical properties (brightness, colour) are at customer’s requests and must be uniform in all paper rolls of a purchase order.
- Paper has no wrinkles, swells, holes, creases or edge cuts.
2- PHYSICAL PROPERTIES
NO | PROPERTIES | UNITS | STANDARD LEVELS | TEST METHODS |
1 | Basic weight | g/m2 | (70; 80) ± 1 | TCVN 1270 |
2 | Bulk | kg/m³ | ≥ 700 | TCVN 3652 |
3 | Moisture | % | 7 ± 1 | TCVN 1867 |
4 | Brightness | % | ≥ 90 | TCVN 1865 |
5 | Opacity | % | ≥ 85 | TCVN 6728 |
6 | Cobb | g/m² | ≤ 26 ± 2 | TCVN 6726 |
7 | Roughness | ml/min | ≥ 250 | TCVN 3226 |
8 | Ash content | % | ≥ 12 | TCVN 1864 |
9 | Dust Dust area (biggest size) | ppm mm² | ≤ 10 ≤ 0.3 | TCVN 1868 |
10 | Average tensile index (MD and CD) | Nm/g | ≥ 40 | TCVN 1862 |
11 | Surface sizing | g/m² | 1.4 | TCVN 7069 |
3- PACKING: 500 sheets/ream; 5 reams/carton box.