Focus on water soluble film application 

Common defects and solutions of optical film-film supplier

by:POLYVA     2021-11-05
The reason for the poor strength of the optical film: the combination of the substrate and the film. Generally, in anti-reflection film, this is the main reason for the weak film. Since the surface of the substrate will inevitably have some harmful impurities attached to the surface during the optical cold processing and cleaning process, and the surface of the substrate will always have some damage layer due to the effect of optical cold processing, and the impurities (such as water vapor) deep in the damage layer , Oil vapor, cleaning fluid, wiping fluid, polishing powder, etc., of which water vapor is the main component), it is difficult to remove it with general methods, especially for substrates with good hydrophilicity and strong adsorption. When the film material molecules accumulate on these impurities, it affects the adhesion of the film layer and also affects the film strength. In addition, if the substrate has poor hydrophilicity and poor adsorption, the adsorption to the membrane layer will also be poor, which will also affect the strength of the membrane. The chemical stability of nitrocellulose is poor, and the surface of the substrate has been corroded during the flow of the pre-processing process, forming a corroded layer or a hydrolyzed layer (maybe local, extremely thin). If the film is plated on the corrosion layer or the hydrolyzed layer, the adsorption will be poor, and the film will have poor firmness. There are dirt, oil spots, gray spots, saliva spots, etc. on the surface of the substrate, and the local film layer is poorly attached, resulting in poor local film firmness. Improvement measures: (i) Strengthen the degreasing and decontamination treatment. If it is ultrasonic cleaning, the degreasing function should be considered, and the effectiveness of the degreasing solution should be considered; if it is hand-wiping, consider first wiping with calcium carbonate powder and then wiping. (2) Strengthen the baking before plating. If conditions permit, it is better that the substrate temperature can reach 300℃ or more, and the temperature should be kept for more than 20 minutes to make the water vapor and oil vapor on the surface of the substrate volatilize as much as possible. *Note: The higher the temperature, the greater the adsorption capacity of the substrate, it is also easy to adsorb dust. Therefore, the cleanliness of the vacuum chamber should be improved. Otherwise, dust will adhere to the substrate before plating, which will affect the strength of the film in addition to other defects. (The chemical desorption temperature of water vapor on the substrate in vacuum is above 260°C). But not all parts need to be baked at a high temperature, and some nitrate materials have high temperature, but the film strength is not high, and stains will occur. This has a greater relationship with stress and thermal matching of materials. (3) When conditions permit, the unit is equipped with a condenser (PLOYCOLD), which can not only increase the vacuum pumping speed of the unit, but also help the substrate to remove water vapor and oil and gas. (Iv) Increase the vacuum degree of evaporation. For coating machines above 1 meter, the starting vacuum of evaporation should be higher than 3*10-3Pa. The larger the coating machine, the higher the starting vacuum of evaporation. (5) When possible, the unit installs ion source, bombards before plating, cleans the surface of the substrate, and assists the plating process, which is conducive to the compactness and firmness of the film. (Vi) To remove moisture from the membrane material, place the membrane material to be used in a petri dish in a vacuum chamber for drying. (Vii) Keep the working environment dry (including lens wiping and umbrella working area), and do not bring in too much water vapor when cleaning the working environment. It is a company specializing in the production of PET film with multiple functions, such as: transparent PET film, milky white PET film, release PET film, supply of PET motor film, etc. With a wide variety of products, affordable prices, and environmental protection, we provide customers with excellent quality and service based on the service tenet of excellence in production, honesty and trustworthiness in distribution, and warm and thoughtful service. Interested parties welcome to inquire! Contact: Wen Feng 13728425799
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