First, the bronzing version is the primary factor to ensure the quality of bronzing
At present, the photo-etching process and electronic engraving technology are mainly used for making bronzing plates, and the materials are usually copper plate or zinc plate. The copper plate material is exquisite, and the surface finish and heat transfer effect are better than the zinc plate. The use of high-quality copper plate can improve the gloss and outline clarity of bronzing graphics.
The traditional photo-etching technique for making bronzing plates is simple and low in cost. It is mainly used for text, thick lines, and general images. For finer and uneven graphics, the bronzing plates need to be re-burned or electro-engraved.
The bronzing version produced by electro-engraving can express rich and delicate level changes, which greatly expands the packaging performance. This process is beneficial to environmental protection, but the investment in electro-engraving equipment is large. At present, the depth of engraving is not ideal, and it is easy to cause bronzing "pasting.
The production technology of holographic anti-counterfeiting bronzing plate is relatively high. Previously it was mainly made in Taiwan or abroad. The plate-making period was longer. It was only used for packaging of fixed and large-volume products. At present, there are several units in Yuncheng, Shanxi, Beijing and Shanghai. gF7 China Design Online China Creative Design Portal
Second, the bronzing equipment "workers want to do their best, must first sharpen their tools"
The selection of bronzing equipment is a key factor in determining the quality of bronzing. The sheet-foil stamping machine has three types: flattening, round flattening, and round flattening. At present, the largest application is the flattening type, mainly including: Shanghai Yahua Printing Machinery Co., Ltd. TYM series die-cutting bronzing two Using machine, TYMl020 automatic bronzing die cutting machine of Tangshan Yuyin Group Co., Ltd., MK series automatic bronzing die cutting machine of Tianjin Youheng Machinery Industry Co., Ltd., the maximum bronzing speed is 5000 hours.
The FOLLJETFBRl04 hot stamping machine from Stoner in Germany is a representative of round pressing. Using the design concept of the offset printing press, the maximum hot stamping speed can reach 10,000 hours. It is currently the fastest single stamping equipment in the world.
The three stamping methods of round flattening, round flattening and flat flattening each have their own advantages and disadvantages: the implementation of round flattening and round flattening hot stamping is linear pressure, the total pressure is small, and it is easily completed with a relatively small pressure Large-area hot stamping on the ground, smooth movement, and high production efficiency of the round pressing round type, especially suitable for hot stamping of large batches of live parts, but because the copper plate arc surface processing is more difficult, the production cost is higher, and the heating roller is also more difficult to heat than the plane.
Flat and flat operation is flexible and convenient, and is more suitable for short version products. Compared with imported bronzing equipment, domestic bronzing equipment has obvious advantages in performance and price. The price of domestic machine is only equivalent to l5 ~ 14 of the price of similar foreign products, but the overprint accuracy, stability and function of imported machine are significantly better than domestic. The machine is also more durable than the domestic machine, and is more suitable for the processing of fixed batches of high-end packaging products. Therefore, product type and batch size are the key to determine the selection of bronzing equipment. Whether it has high-end bronzing die-cutting equipment such as BOBST has become the first choice for customers in the industry.
Three, bronzing suitability
The so-called bronzing suitability refers to the selection of anodized aluminum models and the matching between bronzing speed, temperature, pressure and other factors. When the hardware such as equipment is fixed, correctly grasping the suitability of bronzing is the most important means to improve the quality of bronzing. The following is an analysis of some quality problems reflected from the actual operation, in order to scientifically grasp the suitability of bronzing.
1. The hot stamping does not work or the hot stamping is not true. This is related to the surface characteristics of the printed parts, the nature of the anodized aluminum, the hot stamping temperature and the pressure and other factors.
Too much powder is applied on the surface of the printed part or the surface contains additives such as debonding agent and gloss paste, which will hinder the adsorption of the anodized aluminum and the paper. Solution: Surface powder removal treatment or solution in the printing process. Improper selection of anodized aluminum directly affects the fastness of bronzing.
The type of anodized aluminum used should be comprehensively considered according to the size of the gold foil area and the characteristics of the material to be stamped. The domestic anodized aluminum is mainly the Peacock brand series produced by Shanghai Shenyong Bronzing Material Co., Ltd. The imported anodized aluminum is mainly the PM and LK series of Kurz, Germany, the A, K, and H series of Japan, and the SP series of KOLON of South Korea.
According to our practice and testing, the selection of anodized aluminum can mainly refer to the following categories: hot stamping anodized aluminum on ordinary products has 88-1 type, PM type of KURZ; dense ink color printed products such as cigarette packs and cosmetics (including gold and silver ) 'S hot stamping anodized aluminum has 88-2 type; the anodized aluminum with fine handwriting such as cigarette labels and cosmetic packaging has 88-3, 88-4 type, PM288, etc .; suitable for OPP or PET laminated paper and UV ink The hot stamping anodized aluminum such as cardboard, glazing paper and other products are 88-4 type, K series, LK series, and SP series.
Failure to properly grasp the stamping equipment and the matching between the stamping time and the stamping temperature affect the stamping fastness and the clarity of the graphic outline. Due to the different equipment and materials to be stamped, the stamping time and stamping temperature are different.
For example, the high-speed circular rounding machine is fast and the stamping line contacts, and the hot stamping temperature is higher than the circular flattening or flattening. In general, the temperature of round pressing and round hot stamping is 190 ℃ ～ 220 ℃, the round pressing is about 130 ℃ ～ 150 ℃, and the flat pressing is about 100 ℃ ～ 120 ℃. Of course, the pressing time, hot stamping temperature and production efficiency are also largely restricted by the transfer performance of anodized aluminum.
2. Anti-pulling and anti-pulling means that the anodized aluminum will remove the printing ink or the varnish of the printed parts after hot stamping. The main reason is that the ink on the surface of the printed product is not dry or the post-processing of the UV on the surface of the printed product is improper, resulting in the poor combination of the ink and UV oil on the surface of the printed product and the surface of the paper.
Solution: bronzing after printing is dry. In addition, anodized aluminum with low separation force and excellent heat transfer can be selected.
3. The discoloration and paste of anodized aluminum after paste and hot stamping are mainly caused by the poor production of the bronzing plate, the loose installation of the anodized aluminum, or the incorrect movement of the anodized aluminum foil. The discoloration of anodized aluminum after hot stamping is mainly caused by the high temperature of hot stamping.
In addition, the wrinkling of anodized aluminum is also easy to cause uneven coloring of hot stamping and discoloration, which can be solved by appropriately lowering the temperature. For the round flattening model, a fan can be added at the foil feeding place to keep the foil pulling and flutter, to avoid the anodized aluminum touching the bronzing version and burning it before hot stamping.
4. Improper technological arrangement destroys the glossiness of the surface of the anodized aluminum, and the outline of the picture and text becomes fuzzy. For bronzing that requires lamination processing, people often worry that the gold foil is easy to wipe off and then hot stamping and then laminating, which is easy to cause:
â‘ Thin film (especially matte film) will destroy the gloss of the surface of the anodized aluminum. It is not suitable to use water-soluble glue coating, otherwise it will cause the surface of the anodized aluminum to blacken, and at the same time it is easy to cause the gold powder to stick to the edges of the text and cause a virtual phenomenon. gF7 China Design Online China Creative Design Portal
â‘¡After bronzing, it will sag due to pressure, and the glue is not easy to penetrate the surface of the anodized aluminum, which may cause the separation of OPP and paper at the bronzing place and affect the quality of the product. The correct process is to cover the film before bronzing, and choose the anodized aluminum that matches OPP.
In short, there are many factors that affect the quality of bronzing. Making a high-quality bronzing version and correctly mastering the suitability of bronzing are the key to improving the quality of bronzing.
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