Variation curve of moisture content under different adhesive layer thickness
Under the same drying conditions, the moisture content curves of hydrosol adhesive layers with different thicknesses are shown in Figure 1. It can be seen from the figure that the thickness of the adhesive layer has a very obvious influence on the formation process of the film. The thicker the adhesive layer, the slower the evaporation of water; the smaller the thickness of the adhesive layer, the greater the evaporation rate of water. This is because the hydrosol adhesive layer The thicker it is, the slower the rate at which moisture migrates outward. It can be seen from Table 3-3 that the thicker the adhesive layer is, the thicker the formed film is, and the transparency is poorer, and in the same processing time, the free moisture in the obtained film is more, and the PVA film is easily stretched , it is not conducive to the stripping of the salivating steel strip, the thinner the adhesive layer, the higher the light transmittance, the less the bound moisture in the film obtained by drying and forming, the more brittle the film, the small elastic modulus, and it is not conducive to the stripping. Comprehensive consideration, the adhesive layer The thickness is about 30um .
Effect of Adhesive Layer Thickness on Film Properties
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