The full solution of high-grade packaging products bronzing process (on)

With the improvement of the national economy and the development of the printing and packaging industry, people demand the packaging of products: high-end, exquisite, environmentally friendly, and personalized. In the post-press processing of packaging products, the hot stamping process has been favored by people for its unique surface finishing effect, and has been applied to high-end packaging such as banknotes, cigarette labels, medicines and cosmetics. There are two main functions of bronzing: one is surface decoration, which increases the added value of the product. Hobbies and celebrations are the national traditions of our country. The combination of bronzing and embossing techniques is used to highlight its luxury. The second is to give the products higher security performance. The holographic orientation is used to stamp the trademark logo to prevent counterfeiting and brand names. At the same time, bronzing is very capable of representing the individualization of product packaging and is safe and environmentally friendly. Therefore, many high-end packaging uses a bronzing process.

1, bronzing principle : After a certain temperature, pressure to the color foil instantly the version of the pattern, text attached to the plastic surface.

2, bronzing necessary conditions : 1, temperature 2, pressure 3, color foil 4, hot ornaments Edition

3, hot stamping version :

High-quality hot stamping is the primary factor that guarantees the quality of stamping. At present, bronzing plates are mainly produced by photographic etching techniques and electronic engraving techniques. The materials are often used for copper plates or zinc plates. Copper plate material is delicate, surface finish, heat transfer effect are better than zinc plate, the use of high-quality copper plate can increase the bronzing graphic gloss and outline definition. The traditional photographic corrosion technology makes the bronzing plate process simple and low cost, mainly used for text, thick lines, general images; for the finer, uneven thickness of text and graphics, etc. need to use the second rotten or electric carving technology. Electric carving production bronzing version can express rich and delicate level changes, greatly expanding the performance of the packaging, the process is conducive to environmental protection, but the electric carving equipment investment is relatively large, the depth of the current sculpture is not ideal, easy to cause hot stamping "glue". Holographic anti-counterfeit stamping production technology requirements are relatively high. Previously, they were mainly produced in Taiwan or abroad, and the plate making cycle was long. It was only used for the packaging of fixed and large-volume products.

At present, there are several units that can be produced in Shanxi Yuncheng, Beijing and Shanghai. The bronzing version is mainly made of the following materials:

(1). Silicone rubber plate (rubber wheel): Suitable for general plastic shell, thickness is generally 1.5MM, applicable temperature 180°C-380°C
(2). Copperplate: It is applicable to a large number of hot stampings and is durable. Temperature 120°C-180°C
(3). Zinc plate: not high temperature, high pressure, suitable temperature 120°C-150°C
(4). Steel plate: unused
(5). Magnesium Alloy Edition: Unused

4, color foil:

(1) The thickness of the colored foil: The thickness of the colored foil is 6U-35U, and the factory generally uses 12U-color-less hot embossing. The color foil-thick hot embossed font paste is thin and clear.
(2), color foil is divided into five layers: PE film, release agent, coloring layer, adhesive, adhesive
(3), the classification of color foil:

a. General type: generally used for ABS, PVC, PS, PC
b. Special type (PP color foil): generally used for PP, PE
c. Common type: ABS, PP apply (this foil is better in temperature resistance)

With the rapid development of hot stamping foil and packaging industry, the application of galvanized aluminum bronzing has become more and more widespread. Such as: book cover gilding, gift boxes bronzing, cigarettes, wine, clothing trademarks and boxes of bronzing, greeting cards, invitations, pens, bronzing, etc., its color and pattern as much as can be customized according to specific requirements of the special edition. Hot stamping substrates include general paper, gold, silver and other ink printing paper, plastic (PK, PP, PVC, engineering plastics such as ABS, etc.), leather, wood and other special materials.

Electro-aluminum hot stamping foil is mainly used to heat and press the pattern or text to be transferred to the surface of the stamped material. To complete this process, you need a stamping machine, a template (such as a zinc plate, copper plate, etc.) stamped with special words or patterns, heated to the required temperature, and the pressure required to be transferred and the corresponding elbows held. It should be noted that when hot stamping different materials, the appropriate type of anodized aluminum should be selected, and the appropriate temperature, pressure, and hot stamping time should be selected in order to achieve the desired hot stamping effect.

5, hot stamping equipment:

Hot stamping workshop currently has six stations, eight station machines, flat ironing machine, round ironing machine, shaped machine, ironing machine, double circular machine

Six station machine: all kinds of round surface, irregular whole surface, lines, transfer and so on.
Eight station machine: The entire round surface, hot lines and transfer printing.
Flat Ironing Machine: Products used for hot decoration.
Round ironing machine: used for hot decoration round face fonts and side lines.
Shaped machine: The entire surface of a variety of irregular products, hot lines.
Rolling machine: hot for various flat products.
Double round machine: for round surface products.

The selection of bronzing equipment is a key factor in determining the quality of bronzing. Sheetfoil hot stamping machine has flat pressing, round flat pressing and round pressing. There are three types of flat pressing machines at present. The main applications are: Shanghai Yahua Printing Machinery Co., Ltd. TYM series die cutting hot stamping two Machine, Tangshan Yuyin Group's TYMl020 automatic bronzing die-cutting machine, Tianjin Hengheng Machinery Industry's MK series automatic bronzing die-cutting machine, the highest bronzing speed is 5000 sheets/hour. STEUER FOLLJET FBRl04 hot stamping machine is represented by round press circle. Using the design concept of offset press, the maximum hot stamping speed can reach 10000 sheets/hour. At present, it is the fastest equipment for international sheet-fed stamping. Round press, round press and flat press Three types of embossing hot stamping machines have their own advantages and disadvantages: Round press round and round press Hot press implementation is line pressure, total pressure is small, easy to complete with relatively small pressure A large area of ​​gilding in the field, smooth movement, and high round-round production efficiency, especially for large quantities of live stamping, but due to the difficulty of copper circular surface processing, higher production costs, heating roller than flat heating is difficult. Flat press operation is flexible and convenient, and it is more suitable for short version products. Domestic bronzing equipment has obvious advantages in terms of performance and price compared with imported gilding equipment. Domestic machine prices are only equivalent to l/5-1/4 of the price of similar foreign products, but the overprint accuracy, stability, and function of imported machines are all high. Obviously better than the domestic machine, but also more durable than the domestic machine, more suitable for fixed bulk high-grade packaging products processing. Therefore, the product type and lot size are the key factors that determine the selection of bronzing equipment. Whether it has high-end stamping equipment such as BOBST has become the preferred condition for customers in the industry.

(to be continued)