Vacuum aluminum plating film performance indicators and measurement methods

Vacuum aluminum plating film, the importance of flexible packaging materials, this paper from its thickness and the uniformity of coating, which tells the story of the performance indicators, such as color fastness, as well as various indicators of measuring method. 1, aluminum plating film thickness aluminum plating film thickness measurement generally USES the following three ways. The first is the optical density method, as measured by the light through the density of aluminum plating film. Light density measurement aluminized layer thickness has the advantage of convenient and accurate, and the measured results from the influence of surface oxide layer. Optical density value is related to the incident light wavelength. The second is the surface of square resistance measurements. This method is simple and practical, generally the surface of the aluminum layer thickness corresponding resistance in 1 ~ 2. Sampling or 25 px long wide, 250 px resistance value between 1 ~ 20. Coating just volume, aluminium oxide layer surface, less measurement more accurate. The third method is the visual estimation method. If use two layers of aluminum plating film stack together on a fluorescent lamp or look to the sky, to see the light, coating thickness should be 400? Above, but this method is easily influenced by eye vision, when stick aluminum plating film on eyes to watch, the pupil of the eye can follow the light dimmed and adjustment, otherwise invisible light in the pupil after adjustment will be able to see again. 2, aluminum plating film coating uniformity along the samples being measured lateral equidistance to take 8 ~ 10 specifications for 100 mm & times; Sample of 100 mm, with resistance measuring instrument to measure respectively square resistance value, take the arithmetic average, is the coating resistance of the samples, can also calculate the resistance value and lower deviation, deviation resistance layer resistance, is actually reflects the uniformity of aluminized layer. 3, aluminum plating aluminum plating fastness fastness is generally use tape to measure. When the qualitative determination of aluminized layer fastness with adhesive tape, stick around 375 px long tape and pressing with his fingers on the surface of the aluminum plating. Then the samples with one hand pressure, another hand stripping adhesive tape at a constant speed. With strong light box inspection aluminum layer falls off shift. Another method is used for determination of aluminized layer fastness PET aluminum plating film. The experiment of the preparation of a particular film and PET aluminum plating film according to certain heat sealing heat sealing condition, then the cutting sample with tensile testing machine after stripping, stripping force and check the aluminum layer transfer of heat sealing area.