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With the improvement of the national economy and the development of the printing and packaging industry, people are required to have high-grade, exquisite, environmentally friendly and personalized products. In the post-press processing of packaged products, the hot stamping process is loved by people for its unique surface finishing effect, and is applied in high-end packaging such as banknotes, cigarette labels, medicines, cosmetics. Hot stamping has two main functions, one is surface decoration, which increases the added value of the product. Hobbies and glory are the national traditions of China, and the combination of bronzing and embossing techniques to show their luxury; second, to give products a higher anti-counterfeiting performance, using holographic positioning hot stamping trademark logo, anti-counterfeiting, insurance brand. At the same time, hot stamping is very representative of the individualization of the product packaging and is safe and environmentally friendly. Therefore, many high-end packaging uses a bronzing process.
Main features and applications of bronzing
Bronzing is also called electro-aluminum foil hot stamping. It refers to the processing technology of transferring the pattern and text on the plate to the surface of the paper, plastic and so on after a certain temperature and pressure. Bronzing has the characteristics of clear pattern, beautiful appearance, colorful and eye-catching, wear-resistant and weather-resistant. The product is bronzing, producing a graphic with a brilliant metallic luster effect, which makes the appearance look gorgeous and elegant. Bronzing in the graphic design can play a finishing touch and highlight the design theme, especially for trademarks and registered names, the effect is more remarkable.
With the rapid development of the hot stamping foil and packaging industry, the application of bronzing is more and more extensive. Such as: cigarettes, wine, clothing trademarks and packaging boxes, gift boxes bronzing, greeting cards, invitations, pen bronzing, book cover bronzing and so on. Especially in the packaging box (bag) of cigarettes, wine and clothing, it is widely used. According to preliminary statistics, the application of bronzing technology has reached more than 85% on the printed cigarette labels. In addition to the metallic luster of gold and silver, the color of hot stamping has many colorful colors and patterns, and can also be customized according to specific requirements. The substrate for hot stamping includes general paper, ink printing paper such as gold and silver ink, plastic (PK, PP, PVC, engineering plastics such as ABS, etc.), leather, wood and other special materials.
With the application of high-tech in bronzing, the bronzing process has developed in a deeper and broader direction. For most products (including hot stamping on gold, silver, laser and glass cards), use a wide range of common gold, laser gold stamping. It is used in high-end goods packaging and positioning holographic bronzing with certain anti-counterfeiting effects.
Hot stamping main equipment and materials
Hot stamping is mainly the use of heat and pressure to transfer patterns or text to the surface of the hot stamped material. To complete this process, the stamping machine heats the stencil (such as zinc plate, copper plate, etc.) with special characters or patterns to a certain temperature and the pressure required to ensure the complete transfer of the hot stamping foil. And keep the time. However, it should be noted that for hot stamping different materials, different types of electrochemical aluminum foil should be selected, and the appropriate temperature, pressure, hot stamping time, etc. should be adjusted during operation to ensure the desired hot stamping effect. The equipment and materials used in the bronzing process are mainly the following.
1. Hot stamping machine
At present, the commonly used hot stamping machines mainly include: 6 station machines (suitable for all kinds of round surfaces, irregular whole surfaces, lines, transfer, etc.), 8 station machines (suitable for the whole surface of various round surfaces, line ironing and Transfer, etc.), ironing machine and hot machine (mainly used for graphic printing on hot stamping products), round ironing machine (including double circular machine for hot stamping on circular printing substrate), profiled machine (can be used to stamp all kinds of irregular products, lines, lines, etc.) and so on. The selection of bronzing equipment is a key factor in determining the quality of bronzing.
The sheet-fed hot stamping machine has three types: flat flat, round flat and round pressed. The most widely used one is the flat press type. The round stamping, round flattening and flat pressing flattening methods have their advantages and disadvantages. The round pressing and round pressing hot stamping implementation is line pressure, the total pressure is small, and the pressure is easily completed with relatively small pressure. Large-area hot stamping, smooth movement, and round and round production efficiency is high, especially suitable for large-volume hot stamping, but because the copper plate arc surface processing is more difficult, the production cost is higher, the heating roller is also more difficult than the plane heating. The flat pressing operation is flexible and convenient, and is suitable for short-run products. Compared with imported bronzing equipment, domestic bronzing equipment has obvious advantages in performance and price. The price of domestically produced machine is only 1/5 to 1/4 of the price of similar foreign products, but the overprint precision, stability and function of imported machines are all Obviously better than domestically produced machines, it is also more durable than domestically produced machines, and is more suitable for processing fixed-package high-end packaging products. Therefore, product type and batch size are the key to determining the selection of hot stamping equipment.
2. Hot foil
Hot stamping foil is an electro-aluminized hot stamping foil, which is the main material for hot stamping. Hot stamping foils typically range in thickness from 6 microns to 35 microns, typically 12 microns. The thin printed foil hot stamping is clearer, and the thick printing foil will cause the font to be smeared when it is hot stamped. The basic structure of the hot stamping foil is a base film layer, an alcohol-soluble dyed resin layer, an aluminum-plated layer, and an adhesive layer. It can be roughly divided into two thin layer portions of a polyester film substrate and a transfer layer. When hot stamping, the hot stamping foil is in contact with the substrate, and the transfer layer is fused and transferred to the surface of the printing substrate by the action of heat and pressure. When the hot stamping is completed, the polyester film is together with the untransferred portion. Stripped.
Hot stamping foil can be divided into general type (usually used for ABS, PVC, PS, PC), special type (PP color foil, generally used for PP, PE) and common type (ABS, PP applicable, temperature resistance of this foil) better). Hot stamping foil has two categories: roll foil and single foil. Rolled foil can be divided into different models according to the hot material, mainly No. 1, No. 8, No. 12, No. 15, No. 18 and general type, such as gold, silver, brown red and light according to its color. Blue, black, red, green, etc. Different types of galvanized aluminum have different properties, and the suitable scalding materials are different. For example, No. 1 galvanized aluminum is suitable for hot stamping. The base color is light-colored ink, loose texture paper, leather, varnish, silk and plexiglass, hard. Plastic; 8th anodized aluminum is suitable for hot stamping on paper, varnish, leather; 18th anodized aluminum is suitable for hot stamping on paper products and leather with dark ink and thick lines. The single-piece pure gold foil is suitable for hot stamping of book covers such as varnish, satin and leather; gold powder foil (three kinds of red, green and medium red) and silver powder foil are suitable for cloth (including varnish), paper, enamel and other materials. The cover of the book is hot stamped; while the silver foil is suitable for hot stamping on the cover of cloth, vinyl, leather and other materials.
3. Hot stamping version
The high quality bronzing version is the primary factor in ensuring the quality of bronzing. At present, the gilding plate is mainly made of photographic etching process and electronic engraving technology, and the material is commonly used in copper plate or zinc plate. The copper plate is fine, the surface finish and heat transfer effect are better than the zinc plate. The high-quality copper plate can improve the gloss and contour definition of the bronzing. The traditional photographic etching technology makes the gilding plate simple and low-cost, mainly used for text, thick lines and general images. For the finer, uneven image thickness, the gilding plate needs to use the second bad depth or adopt electric carving technology. The electric gilding version can express rich and delicate layer changes, greatly expanding the packaging performance ability, and the process is beneficial to environmental protection. However, the investment in electric carving equipment is relatively large, and the depth of engraving is still not ideal enough, which is likely to cause bronzing.
The holographic anti-counterfeiting hot stamping plate has high technical requirements. It was mainly produced in Taiwan or abroad in China, and the plate making cycle is long. It is only used for the packaging of fixed and bulk products. The bronzing plate is mainly made of the following materials: silicone plate (rubber wheel): suitable for general plastic case, thickness is generally 1.5 mm, suitable for temperature 180 ° C ~ 380 ° C; copper plate: suitable for a large number of, deep pressure hot stamping, more durable , applicable temperature is 120 ° C ~ 280 ° C. Zinc plate: not resistant to high temperature, high pressure, suitable temperature 120 ° C ~ 150 ° C. In addition, there are steel plates, magnesium alloy plates, etc., which have been basically eliminated.
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