With the improvement of the national economy and the development of the printing and packaging industry, people require the packaging of products: high-end, exquisite, environmentally friendly, and personalized. In the post-press processing of packaging products, the anodized aluminum hot stamping process is loved by people because of its unique surface finishing effect, and is used in high-end packaging such as banknotes, cigarette labels, medicines, cosmetics and so on. Anodized aluminum hot stamping refers to the hot stamping process of hot stamping, silver stamping and other hot stamping materials. For the convenience of discussion, the following is generally referred to as anodized aluminum hot stamping. Bronzing has two main functions. One is surface decoration, which increases the added value of the product. The hobby of festiveness and splendor of gold is the national tradition of China. The combination of bronzing and embossing process to show its luxury; the second is to give the product high anti-counterfeiting performance, the use of holographic positioning hot stamping trademark logo, anti-counterfeiting, brand name protection. At the same time, bronzing can express the personalization of product packaging and is safe and environmentally friendly. Therefore, many high-end packaging uses the bronzing process, so how to improve the quality of bronzing? This article will discuss from the following aspects.
1. Bronzing version High-quality 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-cost. It is mainly used for text, thick lines, and general images. For finer, uneven graphics and other bronzing plates, secondary roasting or electric engraving technology is required. 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.
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 By machine, the TYMl020 automatic bronzing die-cutting machine of Tangshan Yuyin Group Co., Ltd. and MK series automatic bronzing die-cutting machine of Tianjin Youheng Machinery Industry Co., Ltd., the maximum bronzing speed is 5000 sheets / hour. STELL FOLLJET FBRl04 hot stamping machine is the representative of round pressing. Using the design concept of offset printing machine, the maximum hot stamping speed can reach 10,000 sheets per hour. 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 hot stamping equipment, the domestic hot stamping equipment has obvious advantages in performance and price. The price of the domestic machine is only equivalent to l / 5 ~ 1/4 of the price of similar foreign products, but the accuracy, stability, and function of the overprint of the imported machine are all It is obviously superior to domestic machines, and is more durable than domestic machines. It is more suitable for processing 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.
Third, the bronzing suitability The so-called bronzing suitability refers to the selection of anodized aluminum models and the matching between the 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 is not good 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. ①Too much powder is sprayed on the surface of the printing piece 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. ② 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., and the imported anodized aluminum is mainly the PM and LK series of Kurz (Germany), the A, K, 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 on general products (general ink color), anodized aluminum has 88-1 type, KURZ PM type; dense ink color printed products such as cigarette packs, cosmetics (including printed Gold, printed silver) hot stamping anodized aluminum has 88-2 type; cigarette marks, cosmetic packaging and other fine handwriting hot stamping anodized aluminum has 88-3, 88-4 type, PM288, etc .; suitable for OPP or PET laminated paper There are 88-4 type, K series, LK series, and SP series for the hot stamping of anodized aluminum with UV ink on cardboard, glazing paper and other products. ⑧ Failure to properly grasp the stamping equipment and the matching between the stamping time and the stamping temperature, which affects 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 hot stamping that requires film processing, people often worry that the gold foil is easy to wipe off and then hot stamping and then filming, which is easy to cause: â‘ The film (especially matte film) will destroy the gloss of the surface of the anodized aluminum, and it is not suitable to use water-soluble glue film Otherwise, it will cause blackening of the surface of the anodized aluminum, and at the same time it is very easy to cause the gold powder to stick to the edges of the graphics and cause virtual phenomenon. 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.
Outdoor Leisure Chairs,Leisure Lounge Chairs,Sunday Leisure Chair,Folding Leisure Chairs
Bosa Furniture Co.,Ltd. , https://www.bosafurniture.com