How to optimize the laminating process of protective film to avoid bubbles?
Publish Time: 2024-12-05
When using protective film to protect the surface of various products, the generation of bubbles often affects its aesthetics and protective effect, so optimizing the laminating process to eliminate bubbles is a crucial link.
First, in the preparation work before laminating, ensure that the surface of the protected object is clean and flat. Any dust, oil or tiny particles will become a cause of bubbles during laminating. Use a special cleaning solvent and dust-free cloth to carefully wipe the surface, remove all impurities, and ensure that the surface is dry. For example, when laminating the protective film of the mobile phone screen, if there are fingerprints or dust residue on the screen, bubbles are likely to appear after laminating.
Secondly, the control of the laminating environment should not be ignored. Try to choose an environment with no wind, suitable humidity and stable temperature. Wind may blow in dust or interfere with the flat lamination of the protective film, and excessive humidity may affect the viscosity of the glue. Excessive temperature fluctuations may cause inconsistent thermal expansion and contraction between the protective film and the protected object, thereby generating bubbles. For example, in the laminating work of protective film for some high-precision optical instruments, it is usually required to be carried out in a dust-free workshop with constant temperature and humidity.
Furthermore, the optimization of laminating techniques is the key. Starting from one end of the protective film, slowly and evenly laminarize it to the surface of the object, and use a soft scraper or rubber roller to gently squeeze from the laminating start end to the other end to expel the air. The pressure should be moderate. Too much pressure may cause the protective film to deform or scratch the protected object, and too little pressure will not be able to effectively expel the air. For large-sized protective films, the method of segmented laminating and gradual exhaust can be adopted to ensure that each part is tightly fitted and no bubbles remain. For example, when laminating the protective film of a large flat-panel display, the operator will start from one corner of the screen and gradually push it to the opposite side, carefully removing the air with a scraper while laminating.
In addition, some new laminating auxiliary tools and materials can also help eliminate bubbles. For example, using an electrostatic adsorption laminating auxiliary device, first use static electricity to adsorb the protective film on the top of the protected object and preliminarily position it, and then perform laminating and extrusion, which can reduce the air involved in the laminating process. There are also some special laminating glues with low bubble generation rate and good self-leveling properties, which can automatically fill tiny air gaps after lamination.
Through the optimization of pre-lamination preparation, lamination environment, lamination techniques and the use of new tool materials, the lamination process level of protective film can be greatly improved, and bubbles can be effectively avoided, so that the protective film can better play its protective and decorative functions.
