1. PU, PVC appearance quality inspection: under 40W fluorescent lamp illumination, the distance from the tested material 40 ~ 50cm, the color and pattern must be consistent with the standard sample. There should be no obvious scratches, breakages, exposed bottoms, impurities or delaminations.
2. Dimensional inspection of PU and PVC: Use a thickness gauge with an accuracy of 0.05MM to measure. For materials with a nominal thickness of 0.5 ~ 1.0MM, the deviation cannot exceed ± 0.10MM; for materials with a nominal thickness of 1.0 ~ 1.5MM, The deviation cannot exceed ± 0.15MM; for materials with a nominal thickness of 1.5 ~ 2.0MM, the deviation cannot exceed ± 0.20MM. Measure the width with a steel tape with an accuracy of 1MM, and the deviation of the width dimension should be ± 3.0MM.
Performance inspection of PU and PVC:
1. Elasticity: Bend the material sample to 90 degrees, and its rebound degree should be consistent with the standard sample.
2.Stretchability: A 10Kg tensile force is applied to the material sample and the standard sample at the same time. After the external force is removed, the expansion and contraction of the two materials must be the same. .
3. Anti-aging property: Take PU, PVC material samples and standard material samples frozen at -10 ± 3 degrees Celsius for 2 hours, and bake at 45 ± 3 degrees Celsius for 2 hours. determination.