In packaging box printing, hot stamping is a common technology. Hot stamping is also called hot stamping. The substrates for hot stamping include general paper, gold and silver ink printing paper, plastic (PK, PP, PVC, engineering plastics such as ABS, etc.), leather, wood and other special materials. With the application of high-tech in hot stamping, the hot stamping process has developed in a deeper and wider direction. For example, it is applied to most products (including hot stamping on gold cards, silver cards, laser cards and glass cards), and widely used ordinary gold and laser gold hot stamping. It is applied to high-end commodity packaging and has a certain anti-counterfeiting effect. Positioning holographic hot stamping.

Hot stamping mainly uses heating and pressurization to transfer patterns or texts to the surface of the hot stamped material. This process is completed by the hot stamping machine heating the template (such as zinc plate, copper plate, etc.) engraved with special text or patterns to a certain temperature and the pressure required to ensure the complete transfer of the hot stamping foil. And maintain the corresponding time. But what Shenzhen Printing Factory-Jia Run Long wants to say is 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 and controlled during operation. Only in this way can the ideal hot stamping effect be guaranteed. The equipment and materials used in the hot stamping process are mainly the following. Shenzhen Jia Run Long will introduce them to you one by one:

1. Hot stamping machine

Currently, the commonly used hot stamping machines are: 6-station machine (suitable for various round surfaces, irregular whole surfaces, lines, transfers, etc.), 8-station machine (suitable for various round surfaces, line hot stamping and transfers, etc.), flat ironing machine and rolling ironing machine (mainly used for hot stamping pictures and texts on flat products), round hot stamping machine (including double round machine, used for hot stamping pictures and texts on round surface substrates), special-shaped machine (can be used for hot stamping pictures and texts on the whole surface, lines, etc. of various irregular products), etc. The selection of hot stamping equipment is the key factor in determining the quality of hot stamping.

2. Hot stamping plate

High-quality hot stamping plate is the primary factor in ensuring the quality of hot stamping. At present, the production of hot stamping plates mainly adopts photoetching technology and electronic engraving technology, and the materials are usually copper plates or zinc plates. The copper plate is fine in material, and the surface finish and heat transfer effect are better than the zinc plate. The use of high-quality copper plates can improve the gloss and outline clarity of hot stamping images. The traditional photoetching technology is simple and low-cost to make hot stamping plates, which are mainly used for text, thick lines, and general images; for hot stamping plates with finer textures and uneven text thickness, secondary deep rot or electric engraving technology is required. Electric engraving can show rich and delicate level changes, greatly expanding the packaging performance ability, and this process is beneficial to environmental protection. However, the investment in electric engraving equipment is relatively large, and the current engraving depth is not ideal, which is easy to cause hot stamping "paste".

The production technology requirements of holographic anti-counterfeiting hot stamping plates are relatively high. In the past, they were mainly made in Taiwan or abroad. The plate making cycle was long and it was only used for the packaging of fixed and large batch products. The hot stamping plate is mainly made of the following materials: Silicone plate (rubber wheel): suitable for general plastic shells, generally 1.5 mm thick, applicable temperature 180℃～380℃; Copper plate: suitable for large-scale, deep hot stamping, relatively durable, applicable temperature 120℃～280℃. Zinc plate: not resistant to high temperature and high pressure, applicable temperature 120℃～150℃. In addition, there are steel plates, magnesium alloy plates, etc., which are basically eliminated at present.

3. Hot stamping foil

Hot stamping foil is electrochemical aluminum hot stamping foil, which is the main material for hot stamping. The thickness of hot stamping foil is generally 6 microns to 35 microns, and 12 microns is generally used. The images and texts of thin hot stamping foil are clearer, and the fonts will become blurred when hot stamping thick foil. The basic structure of hot stamping foil is base film layer, alcohol-soluble dyeing resin layer, aluminum plating layer, and adhesive layer. It can be roughly divided into two thin layers: polyester film substrate and transfer layer. During hot stamping, the hot stamping foil contacts the substrate, and the transfer layer is fused and transferred to the surface of the substrate by heat and pressure. When the hot stamping is completed, the polyester film is peeled off together with the untransferred part.

Hot stamping foil can be divided into general type (generally used for ABS, PVC, PS, PC), special type (PP color foil, generally used for PP, PE) and common type (applicable to ABS and PP, this foil has good temperature resistance). Hot stamping foil is divided into two categories: roll foil and sheet foil. Roll foil can be divided into different models according to the hot stamping material, mainly No. 1, No. 8, No. 12, No. 15, No. 18 and general type, etc., such as gold, silver, brown red, light blue, black, bright red, green, etc. according to its color.