Aluminum plating process for vacuum coating equipment common problems
From: VacuumFamily.COM News Centre Add Time: 2016-1-28 16:07:00
Vacuum coating machine vacuum aluminum plating is under vacuum condition, molten aluminum metal heating to transpiration, condensed aluminum atoms in polymer material appearance, consists of very thin aluminum layer. Vacuum aluminum plating request base material surface lubrication, smooth and uniform thickness; Appropriate stiffness and friction coefficient; Surface tension is greater than 38 dyn/Cm2; Thermal performance is good, stand transpiration the effect of the thermal radiation and condensation heat source; Base material moisture content is below 0.1%. Commonly used aluminum plating substrate with polyester (PET), polypropylene (PP), polyamide (PA), polyethylene (PE), polyvinyl chloride (PVC) film, etc. * * aluminum plating technology for vacuum coating equipment what are the common problems? 1, aluminum plating film hole appeared The reason: (1) in transpiration boat aluminium material is too full. Solution: falling aluminium feeding speed; Transpiration boat current progress. (2) vacuum evaporation boat between present short circuit. The solution: cleaning a short-circuit. (3) vacuum indoor splash of impurities 2, aluminum plating film tensile phenomenon appeared The reason: (1) substrate tension is too big. Solution: adjust the rolling and coiling tension control system, proper cutting tension. (2) the abnormal cooling system work. Solution: check the cooling system, and eliminate failure. 3, film surface appear brown stripes The reason: (1) low vacuum solutions: the aluminum vacuum indoor cleaning, evaporation equipment, cooling system and rolling, winding equipment and guide roller; Check the vacuum system; By environmental humidity. (2) thin film gas release. Solution: film pre boring; Extension of vacuum time. (3) aluminum. The solution: progress speed. Decrease transpiration boat current; Falling aluminium feeding speed. (4) evaporation boat with impurities. The solution: cleaning transpiration boat and heat shield plate. (5) evaporation boat aging. Solution: replace transpiration. Technical requirements: vacuum degree is not less than 103 pa, avoid brown stripes or aluminum layer thickness uneven appearance; Control system of tension, the open cooling system, to avoid film heating shows tensile deformation; Precise manipulation of the coiling speed (280 ~ 320 m/min), aluminum feeding speed (0.4 ~ 0.7 m/min? 2 mm aluminium wire) and transpiration boat heating current, in order to get the goods request aluminum layer thickness (100 ~ 300 ° a); Can advance the film on the bottom of the glue coating must dry amount, and abundant dry, then through vacuum aluminum plating, can progress aluminum layer and the adhesion strength of the film. And the maintenance of coating on aluminium film will quantitative resin, avoid aluminum oxide layer. By means of this technology in the composition of plating aluminum film, friction resistance, and not easy to change.
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