Labels can have many options for surface finishing, such as: hot stamping (hot stamping, hot laser foil, hot cat eye), laser stamping transfer, glazing, laminating, squeezing and so on. Glazing is the most common process for label finishing, but even the most common processes, different combinations will renew new machines.
Fog combination
Generally, matt oil has a high-grade temperament, but the key parts need bright oil to stand out. The combination of partial matte effect and partial glossy effect is the best partner for low cost.
Sometimes, when a layer of fog oil is not enough fog, we can increase the sub-gloss by adding a little white ink or printing two layers of fog oil to the fog oil. The flatness of varnish is the key to determining its brightness. Usually, in order to level it, varnish needs to be solidified after a certain period of time to ensure that it has enough time to level; or it can be helped by wind blows. Leveling.
Of course, varnish has various parameters to define its performance. It can be improved by means of wax additives, leveling agents, slip agents, etc., and needs to be guided by the ink supplier's instructions.
Super calendering
Supercalendering is a good method when direct glazing does not achieve the desired brightness. Supercalendering and laser imprinting transfer adopt the same principle, that is, using the flatness of BOPP film itself and its low surface energy characteristics, the printed varnish is combined with BOPP film by cold ironing device, then solidified and reused. The winding system of the cold ironing device rewinds the BOPP film for the next repeated use.
Since the surface energy of the BOPP film is only 32 dynes, the varnish cannot adhere to the BOPP film at all; however, since it is combined with the flat BOPP film and cured by the UV lamp, the cured varnish surface is the same as the BOPP film. Flat and shiny.
The precautions for BOPP supercalendering are similar to cold foiling. However, since the BOPP film is a transparent material, it is necessary to correctly mark the front and back surfaces to prevent the use of the wrong surface. Under normal circumstances, one side of the BOPP film will be corona treated to suit the compounding, but this side is not suitable for supercalendering. In addition, the tidy winding is an indispensable prerequisite for the repeated use of BOPP film. When the BOPP film can be used repeatedly, the cost of supercalendering can be minimized.
Screen stereo glazing
There are three main features of the screen glazing. One is that the brightness of the screen varnish is much larger than that of ordinary varnish. The second is that the glazing coating on the screen can have a three-dimensional effect. When the screen varnish is coated on the spot color ink layer When it is on, it is equivalent to the spot color of the screen printing, so that the one-color screen glazing can achieve the effect of multi-color screen printing. The third is that the film-like material can form an extrusion convex effect, the paper material can be easily pressed and convex, but the film material is easily deformed by being pressed and convex, and is not suitable for pressing the convex. In this case, the screen is usually used for glazing. The way to replace the extruded convex. The Procter & Gamble's Olay product label on the market is a typical screen printing stencil. There are also many wine label, business card, etc., which also use the screen glazing case, which significantly raises the label to a higher level.
Reverse upward light
The reverse light effect is actually produced by two layers of varnish. The surface energy of the lower layer of varnish is low, so the varnish of the upper layer will show signs of shrinkage after printing, so it is called "reverse". But it is not the random look for two kinds of varnish to do the reverse effect. First of all, the lower varnish should ensure the shrinkage of the upper varnish, while also ensuring the adhesion of the upper varnish and the speed of shrinkage. Again, the upper varnish must match the underlying varnish. The varnish provided by different manufacturers will have great differences. When proofing, it is necessary to fully record the sampling parameters and the difference of the reverse light effect during acceleration and deceleration. Even the strength of the UV lamp and the thickness of the varnish will have an effect on the reverse light. There are significant impacts that need to be identified to address the need for mass production.
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