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Ways to improve the quality bronzing and attention problems – hot stamping, finishing – printing industry
Nowadays, despite the development of technology, innovation and India after the finishing process, there has been cold stamping, hologram positioning hot stamping and other new technology, but finishing in the traditional stamping as an important process, because of its unique decorative effect, not been cold, but more attention by people and preferences. Therefore, how to improve the quality of bronzing often become issues to be explored here, I talk about this issue from several aspects of some of my personal experience.
1. Bronzing of basic technology The main material is foil stamping, so tipping is also called hot stamping. Is the use of hot stamping transfer principle, the transfer layer of aluminum foil to the substrates surface. The basic process is: First, in joint pressure, which was hot stamping foil version of substrate to suppress the condition, the foil to heat it on the hot melt silicone adhesive resin layer and melt, then melting heat silicone resin adhesive smaller, while the special Thermal After the adhesive melt viscosity increased heat, making aluminum foil layer and basement membrane peeling, while transfer to the substrate. With the pressure of the removable, adhesive curing rapidly cooled, aluminum layer firmly attached to the substrate, the completion of a stamping process.
Stamping process flow include: stamping preparation, loading, pad version, adjusting the stamping process parameters, hot test, sign-like, the official stamping.
2. To improve the quality of the way to stamping
From the basic process can be seen bronzing, bronzing of the three basic elements: temperature, pressure and transfer time. To get an ideal effect of stamping, stamping temperature, hot stamping pressure, stamping process parameters such as speed control must be reasonable; In addition, raw materials and bronzing the quality must be protected, such as: adaptive stamping substrates , foil stamping version of the material properties and quality, etc.. If a link is a problem, will affect the final stamping effect.
1) selection of suitable substrate Many substrates can be gilded, usually paper, such as: art paper, white paper, white cardboard, textured, offset paper and so on. But not all of the paper are ideal bronzing effect, if the rough surface of paper loose paper, for example, for books and paper, offset paper and poor, as not a good foil layer attached to its surface, the unique metal Luster can not properly reflected, and even hot stamping is not, so, tipping the dense texture of substrates to be used, smooth high surface strength of paper, hot stamping so as to obtain good results, the unique foil gloss fully reflected.
2) according to the different substrates choose the right foil type
Foil the structure of 5 layers, namely: polyester film layer, off layer, color layer (protective layer), aluminum layer and layer. Foil type more common with l, 2, 8, 12, 15 and so on. Except for the color gold, there are silver, blue, reddish brown, green, red, etc. dozens. Select foil not only to choose the right color, but also according to the different substrates, select the appropriate model. Different models, their performance and range of material suitable for iron differ. Typically, paper products, hot stamping is the most used No. 8, No. 8 foil adhesive force because of moderate gloss better, more suitable for general Print Paper or has coating of paper, cloth stamping. If the hard Plastic Stamping should be chosen on the corresponding other models, such as the 15 foil.
Foil rely mainly on visual quality and feel to check, such as checking the color of foil, such as brightness and trachoma. Good quality anodized aluminum requirements uniform color, bright and clean after stamping without trachoma. The foil of the fastness and the general tightness can hand rub, or try using cellophane tape, sticky paper to inspect its surface. If the foil off easily, indicating fastness, good tightness, preferably small text stamping patterns, stamping hard paste version of the time; if foil and gently rub off on one after another, then explain the tightness of poor, only Text can be used for sparse stamping; Also, pay attention to foil the decapitation, decapitation less the better.
It is noteworthy that we must take good care of foil should be kept in ventilated and dry place, not with acid, alkali, alcohol and other substances mixed up in one place and have moisture, heat, sun protection measures, or electrochemical shorten the period of use of aluminum.
3) produced a good stamping Edition Stamping version
generally etching, zinc plate, and resin version, relatively speaking, the best copperplate, zinc plate moderate, somewhat weaker resin version. Therefore, for fine stamping, copperplate as long as possible. For stamping version, requiring that their surface roughness, fax lines, clear, smooth edge, no pitting, and burr. If the surface is slightly uneven or light scratches, fluff, the available carbon gently wipe fine, so smooth. Stamping edition version of the depth of rot should be slightly deeper, at least 0.6mm or more, about 70 ° slope in order to ensure the stamping Graphic clear, reduce the occurrence of contiguous and paste version, while increasing rates of resistance to India.
Stamping of text, lines and patterns Design Very particular about. Photo moderate thickness as far as possible, desirable density, such as too small too small, easy to program missing document break; too rude and too close, then easily paste version.
4) good control of temperature stamping
Stamping temperature on the hot-melt silicone adhesive resin layer and melting off a greater impact, hot stamping foil temperature must not be less than the lower limit of temperature range, which is to ensure foil layer of melting glue lowest temperature. If the temperature is too low, melting is not sufficient, cause no stamping or hot stamping is not strong, so imprinting is not strong, incomplete, missing document or blur off plan; and the temperature is too high, then melt over, resulting in imprinted around the attachment The foil has melted off and produce paste version, while high temperature will make color layer resin and dye oxidation polymerization, imprinted blister or macular fog, and lead to the surface of aluminum oxide layer and the protective layer to reduce stamping products brightness, or loss of metallic luster. In general, heating temperature should be adjusted between 80 ~ 180 , stamping larger, the relative heating temperature is higher; the other hand, is lower. Circumstances should be based on the actual plate temperature, the foil type, graphic conditions and other factors to determine, usually by trial and identify the most suitable for hot temperature, the lowest temperature can be imprinted with a clear graphic lines as the standard.
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