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Quality Characteristics
Appearance
grade Item | A Class | Qualified | Off-grade | |
Appearance | Coating | Bottom and surface color uniform. Coating thickness reaches parameters required | Bottom and surface color does not uniform. Coating thickness varies parameters required ≥10% | Obvious un-uniformed |
Joint | ≤1pc/120m | ≤4pc/120m | ≤4pc | |
Pinhole | ≤4pc/m seen | ≤6pc/m2 seen | ≤6pc/m | |
yellow spot | Not allowed | A little bit allowed but not affect stamping. | Stamping problem. | |
Damage | No fold, scratch, crush allowed. | ≤10cm/1m long. | A lot | |
Note: 1) Pinhole means aluminum particles sputtered to the film during vaccum metalisation process. Such defects refers to the visible hole size 1.0 mm maximum.
2) Yellow spot means that the film becomes slightly yellow.
3) No wrinkle is allowed in the joint of each interface, 0.64m deep of adhesive tape required.
4) Rewinding hardness of the roll must keep consistent. Mark can be seen when pressing by hand.
5) Backing release paper colour must be the same. Yellow and white must be stored separately. Attention should be paid to the yellow back colour. No significant deviation is observed with eye.
Size
Size | Nominate | Allowance | |
Width | 0.64M | A class(+/-2mm) | Qualified((+/-5mm) |
Length | 120M | A class((+/-0.5m) | Qualified(±1.2m) |
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