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Direct answer: The root cause of the poor adhesion of laminated paper is mostly due toLow membrane surface energy, glue not eating paper fibers, poor coordination between opening time and compressionThese three points. The surface of laminated film (especially optical film) is smooth and has low polarity. Ordinary book and magazine adhesive particles only “stick” to the film without real anchoring, and can be easily peeled off. Guangzhou Sunlife Trading has dealt with a large number of such problems on site for graphic and text fast printing and color box customers. The idea is to first distinguish between “sticking film or paper”.
| phenomenon | Possible reasons | Process |
|---|---|---|
| The membrane surface is clean and the entire piece is detached | Low optical film energy and mismatched adhesive | Replace with high polarity adhesive particles or frosted film surface |
| The adhesive wire becomes thinner before peeling off | Low temperature and insufficient adhesive amount | Heating up to 5-10 ℃, with a glue amount of+2g |
| Initial adhesion can be removed after being placed | Pressing too late, already dry on the surface | Shorten the open section, apply pressure immediately |
Q: Is sub film more adhesive than light film?
Yes, the surface of the sub film is slightly thicker and has higher energy, and its adhesion is usually better than that of the light film; But it is still recommended to use laminated adhesive particles instead of ordinary sealing glue.
Q: Can changing the glue solve the problem or must we change the process?
In most cases, choosing the appropriate film coating model for Sunlife hot melt adhesive can solve the problem; If the material is extremely difficult to stick, such as high gloss cold film, it needs to be treated with roughening or corona discharge.
Summary: First, judge whether it is a problem with the film or the adhesive by looking at the fracture surface, and then select the adhesive or treat the film surface accordingly. If the laminated paper is not firmly adhered, it can be basically improved on the same day.
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