Composite film transparency

Packaging: the reason that affect the transparency of the composite membrane, mainly include the following: an improper selection, adhesive, such as adhesive darker themselves or illiquidity, flowing performance is poor, can't fully spread out in composite membrane. Generally the main rubber solid content and the higher the liquidity, the better, to spread out on the thin film. Overall, 75% of the glue is better than 50% of the transparent effect, 50% of the rubber is better than that of 40% or 35% of the rubber. For the high demand for transparency in line with the film, the use of 50% and 40% of the rubber compound is difficult to meet the requirements. 2, process problems: first, the drying tunnel of compound machine temperature is too high, dry quickly be fine adhesive solution surface solvent quickly swing ( Steam) Hair, premature adhesive solution surface crust, and then after the internal heat into the glue liquid layer, under the film solvent gasification, when the gas film through skin is shaped like a caldera, coils of ring, rubber is not transparent. Secondly if there are defects in line with the dandy roll or scraper, a pressure point false, form the space, also can cause meet after the film is not transparent. In the working environment of excessive dust in the air, after the glue drying and absorption in the hot air of also have dust, stick to the surface of rubber or composite sandwiched between two layers of basement membrane, a lot of dust from opaque or transparent. The solution is: closed compound on the plastic parts, drying tunnel inlet with high mesh filter, blocking dust sucked into ( Baked road dust from the air is clear) 。 In addition, there is no fair rubber roller or rubber roller is not clean, will make the composite film is not bright, after enough or composite glue, glue doesn't even have a blank space, with the tiny bubbles and hearing the spotted or opaque. The solution is: check adjust the amount of glue, make it on foot and uniform coating, commonly known as the '' pockmarked face film. Three, other problems: it's important to note that composite hot blast temperature is not enough, part of the hot melt glue can't melt, cooling roller temperature is too high, can't the sudden cooling can lead to poor in line with the film transparency. Solution: hot drum shall not be lower than the temperature of 70 degrees, hot melt of the colloid began to melt when the temperature reached 65 degrees, transparency not only improve after melting and composite fastness is increased. Cooling roll chilled or frozen water cycle cooling is used, the faster the cooling speed, transparency, the better, composite membrane with better flatness and fastness, the better.