| Total Thickness of Base Film |
μm |
100±10 |
100±6 |
99.4 (Pure LLDPE, uniform thickness distribution) |
Qualified |
| Whiteness Uniformity |
- |
No obvious color difference, uniform whiteness, no yellowing, no spots |
No color difference, uniform dispersion of white masterbatch, no yellowing, no spots, no color migration |
No color difference, uniform masterbatch dispersion, no yellowing, no spots, no color migration |
Qualified |
| Light Shielding Rate |
% |
≥92.0 |
≥94.0 |
94.7 |
Qualified |
| Tensile Strength (Longitudinal/Transverse) |
MPa |
≥24/≥22 |
≥26/≥24 |
26.5/24.8 |
Qualified |
| Elongation at Break (Longitudinal/Transverse) |
% |
≥360/≥340 |
≥380/≥360 |
385/367 |
Qualified |
| Heat Sealing Strength (122℃, 0.32MPa, 1s) |
N/15mm |
≥13.0 |
≥15.0 |
15.6 |
Qualified |
| Surface Tension (Corona Treated Surface) |
mN/m |
≥36 |
≥38 |
39.7 |
Qualified |
| Tear Resistance (Longitudinal/Transverse) |
N |
≥18/≥16 |
≥20/≥18 |
20.5/18.7 |
Qualified |
| Moisture Barrier Performance (23℃, 85%RH) |
g/(m²*24h) |
≤5.2 |
≤4.7 |
4.5 |
Qualified |
| Oil Resistance (Soaked in n-hexane for 24h) |
- |
No obvious swelling, discoloration or deformation |
No swelling, no discoloration, no adhesion, no masterbatch precipitation, no deformation, no oil penetration |
No swelling, no discoloration, no adhesion, no masterbatch precipitation, no deformation, no oil penetration |
Qualified |
| Hardness (Shore D) |
HD |
57±5 |
57±3 |
56.9 |
Qualified |
| Weather Resistance (UV Aging for 72h) |
- |
No obvious yellowing, fading, cracking or discoloration |
No yellowing, no fading, no cracking, no deformation, whiteness retention rate ≥98.0% |
No yellowing, no fading, no cracking, no deformation, whiteness retention rate 98.8% |
Qualified |
| Environmental Protection Performance (Food Contact Grade) |
- |
Complies with GB 4806.7-2016 |
Complies with GB 4806.7-2016, no peculiar smell, no harmful precipitation, non-toxic white masterbatch, no heavy metal residues, no harmful substance release |
Complies with GB 4806.7-2016, no peculiar smell, no harmful precipitation, non-toxic white masterbatch, no heavy metal residues, no harmful substance release |
Qualified |
