Item No.:KSLH-02
Product strucure: Lacrosse head
Product description:
Packing details:
30pcs per carton
carton size:50 x40 x42cm
G.W.:7kg
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(1) Adhesion between substrate and UV varnish
If UV varnish is applied on the plastic film, the surface tension of the film must be 40 to 42 mN/m. Otherwise, the UV varnish will not be adhered firmly. Under the effect of external force, the varnish layer will easily fall off into small pieces. In addition, to ensure that the ink is completely dry before coating, for example, the front end uses water-based ink printing, the substrate is paper, although the ink on the surface of the paper seems to be dry, but there may still be solvent residues inside, if coated with UV light at this time In the oil, when the UV varnish is cured, the alcohol in the residual solvent reversely wets the UV varnish layer, causing the UV varnish layer to fall off during the next process.
(2) Leveling of UV Varnish
The rotary gravure printer has a high speed, and the UV light oil has poor fluidity, which often causes the varnish to not level out. Therefore, a low-brightness, spot-like, or corrugated UV light oil layer often appears. The main factors influencing the leveling of the UV varnish are the mesh number of the anilox roller, the viscosity and temperature of the UV varnish, and the like.
(3) The UV lamp generates a lot of heat, easily deforming or dehydrating the substrate
Due to the higher temperature of the UV lamp, the surface temperature of the substrate is higher, and UV curing is generally used to cool the lamp shade. However, the lamp can only be prevented from being roasted and the surface temperature of the substrate cannot be solved. Reducing the substrate surface temperature can use the following methods.
1 Use a high-efficiency UV lamp. The proportion of ultraviolet light emitted from imported high-power UV lamps accounts for about 30%, while most domestic UV lamps can only reach 15% to 20%.
2 Insulation glass is added between the UV lamp and the substrate. In general, 3mm thick imported quartz glass can absorb 10% of ultraviolet light. Although the installation of heat-insulating glass will reduce the printing speed, it is indispensable for the printing of PVC film with a temperature resistance of less than 15 μm, and it is not necessary to add other materials.
3 Reduce the number of UV lamps and increase the power of each UV lamp. The process of heat absorption by the substrate is from the surface to the inside. This process is slow, so quickly passing through the high temperature area can prevent heat from being introduced into the substrate. According to this principle, the shorter the time for the paper to pass under the UV lamp, the better. This requires that the number of UV lamps is small, the opening width of the lamp housing is small, and the power of each lamp is increased. For example, the width of the opening of the Nordson UV lampshade is only 70mm, and the width of the opening of the UV lampshade is 75mm. However, the power of both UV lamps is very high. At present, UV lamps with a power density of 400 W/cm have been sold on the US market.
(4) Energy Saving of UV Lamps
1 Use efficient UV lamps.
2 correctly match the UV lamp power, printing speed and optical oil layer thickness.
3 With low power consumption, the internal power consumption of the transformer power supply is generally greater than 10%, while the internal power consumption of the transformerless power supply (such as the UVC power supply produced by Pantoc, Switzerland) is less than 1%, and due to the quick start and stepless power regulation, Can save 30%.
4 Use a smaller diameter UV lamp. Ultraviolet light is emitted from the center of the UV lamp. Heat is transferred gradually through molecular collisions. The center temperature can reach 1700°C. However, the internal molecular collision of the UV lamp consumes a lot of energy and is useless. Therefore, a UV lamp with a smaller diameter should be used, such as High power water-cooled capillary UV lamp with a diameter of only 6mm.
At present, many UV lamps cannot be made smaller in diameter. The reason is that the smaller the diameter of the UV lamp, the greater the wall load will be. This will cause the wall to bulge and deform. The longer the lamp, the more pronounced the deformation. Therefore, it is recommended that companies use short and thin diameter lamps for docking.
5 Reduce the UV light path. The UV path is the product of the distance traveled by the UV lamp to the surface of the substrate and the refractive index. To reduce the UV light path, the reflector should be as small as possible, and the distance between the UV lamp and the surface of the substrate should be as short as possible. The measurement results show that the attenuation of UV light is proportional to the square of the UV light path, the UV light path increases by 10 mm, and the UV light energy decreases by about 5%.
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