For the plastic materials used in the vacuum coating machine, it needs to have a high combination with the film, a small amount of air release, and stable heating. At the same time, the plastic materials that meet these three conditions are very few, but the application of plastic materials in industrial production is very extensive, so the application of the plastic vacuum coating machine also develops. In order to make more plastic into the vacuum coating, it is often through Various methods are improved.
Now it introduces some common plastics in vacuum coating. ABS is the first one to be used, which meets three conditions at the same time. A stands for acrylonitrile, B stands for butadiene, s stands for styrene. ABS plastics contain the above three substances. After ABS coating, it can give full play to its mechanical properties and impact resistance, depending on its hardness, wear resistance and low cost It is often used to replace some metal mechanical parts and also to produce the housing of household appliances. However, ABS cannot be used outdoors because of its butadiene content, otherwise it will change color.
PETP polyethylene terephthalate vinegar, abbreviated as polyester, is another kind of plastic that meets three conditions after ABS. The film has good tensile strength and toughness. PS polystyrene can withstand the temperature below 100 ℃, and the adaptability of vacuum coating is also good, so it is not widely used. PC polycarbonate can also be vacuum coated, with good mechanical properties and impact resistance, but the price is relatively high, and the addition of PC polycarbonate is not well controlled during molding, which is prone to cracking. PA polyamide vacuum coating can prevent oil and moisture, shading and heat insulation performance is also very good, can be used to produce high-grade packaging products.
Due to the poor adaptability of vacuum coating, polyethylene can be used for vacuum coating after transformation, but only low-grade packaging products or heat insulation products can be produced. Polypropylene is more stable and light than polyethylene, so its utilization value is relatively high. However, the combination of polypropylene and film is poor, so coating can only be carried out after surface treatment, and the film is used for decoration Function, make the product more beautiful.
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