Several points to pay attention to when using UV varnish of Rigid Cardboard Chocolate Paper Boxes
Jan 14, 2022
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Several points to pay attention to when using UV varnish of Rigid Cardboard Chocolate Paper Boxes
1. UV varnish of Rigid Cardboard Chocolate Paper Boxes is divided into two different formulas: winter type and summer type
1. When using, you should pay attention to distinguish between seasons and changes in weather and temperature, and choose suitable varnishes. Winter formulations have lower solids content than summer formulations in order to improve the smoothing properties of the oil when the temperature is low in winter; in summer, when the temperature is higher, increase the solids content in order to increase the UV curing speed.
2. If the winter formula is used in summer, the UV oil will not be cured completely, which will easily cause anti-sticking and other phenomena; on the contrary, if the summer formula is used in winter, the UV oil will have poor smoothing performance, resulting in foaming and orange peel.
Second, UV varnish of Rigid Cardboard Chocolate Paper Boxes should be fully stirred before use
UV varnish of Rigid Cardboard Chocolate Paper Boxes is made by blending many kinds of chemical raw materials. After not being left for a long time, some of the chemical raw materials in the varnish will be separated. It should be fully stirred before use.
3. Avoid completely drying and anti-sticking methods
1. The speed of the light curing machine is adjusted to the slowest speed that does not affect the production.
2. Choose 2*5.6kw light curing machine, the normal speed is 30m/min.
3. Ultraviolet light tubes that cannot have their service life expired (the national standard is: 800h~1000h, and the domestic lamps are about 500h).
4. The UV lamp and lampshade should be cleaned and wiped with alcohol once a month to avoid dust blocking and affecting the curing effect.
5. After the product passes through the UV curing machine, it cannot be stacked immediately. It should be divided into 5-10 sheets and placed on a drying rack to cool for 15 minutes before stacking.
6. If you encounter dark blue, black, or special substrates, use quick-drying UV varnish of Rigid Cardboard Chocolate Paper Boxes or lower the speed.
Fourth, how to detect whether the UV matte film varnish is completely dry and avoid anti-stick phenomenon
UV matte film varnish is made of resin with low melting point. In hot summer, if the side is not completely dry, it is easy to stick back. First of all, the drying procedure of UV varnish of Rigid Cardboard Chocolate Paper Boxes is divided into surface drying and deep drying, so it is impossible to rely on hand molds alone. At present, there is no definite detection and drying method in the industry, but the following three methods can be provided according to experience:
1. Press firmly with a dry index finger on the UV varnish of Rigid Cardboard Chocolate Paper Boxes surface after drying for 5 seconds, release the non-stick hands for complete drying.
2. Fold several finished products and press them with a force of 50kg to 100kg for 2-3 hours.
3. Wipe the surface with talc.