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.

Thermal transfer process

1. Round flat stamping method:

The round flat stamping method is actually the process principle of the flat thermal transfer machine. Flat thermal transfer machines are mainly used for flat substrates and large curved surfaces. The products that can be round flat transferred are mainly in the following forms: products that need to be transferred on the entire surface. Panels of household appliances, a certain surface of cosmetic boxes, the upper surface of plastic gift boxes or wooden jewelry boxes, toy puzzle boards, plastic decorative murals, table display racks, fan surfaces, PVC plastic boards, etc., skis, plastic posters. By designing a floating device on the workbench, the round flat stamping machine can transfer special products with more complex shapes. The representatives of this type of thermal transfer machine are KC-H-150M and KC-H-300M. We usually call the transfer machine with the stamping device as a rubber roller a thermal transfer machine.

2. Round-on-round hot stamping method:

It is the process principle of the cylindrical heat transfer machine. In order to achieve multi-purpose use of one machine, most hot stamping machine manufacturers combine the functions of the flat heat transfer machine and the round surface heat transfer machine to achieve the dual functions of the flat and curved surface. When performing flat transfer, the rubber roller presses down and rotates, and the workbench moves in the left and right directions; when performing curved surface transfer, the workbench is kept stationary, and only the rubber roller and the round surface product interact with each other in pure rolling.

u Hollow plastic bottles: One type is relatively hard and can withstand the pressure of the rubber roller. Such bottles can be transferred, but axial positioning measures must be taken. The other type is relatively soft. Such products must be inflated before they can be transferred.

u Plastic hose

Toothpaste, facial cleanser, hand cream, facial cleanser, etc. The opening of such products is as large as the bottle body, and a support shaft can be made to conveniently support the product for transfer.

u Cup products

Cup products are similar to hoses, and the opening is generally larger than the bottle body. It is more convenient to make the support shaft. The proportion of cup products using transfer technology is the largest.

Hot stamping process

3. Flat pressing hot stamping method:

Model of flat hot stamping machine: hot stamping text and trademarks on a certain part of the plane. Such as: VCD panel. The action of the flat hot stamping machine is relatively simple, and only the hot stamping plate performs up and down actions. This type of hot stamping machine is the most diverse: KC-HM-TC series manual flat hot stamping machine, KC-H-TC series pneumatic flat hot stamping machine.

4. Flat pressing round hot stamping method:

It can achieve hot stamping on round surfaces. Such as: plastic bottle caps, ballpoint pens, hoses, glass bottles, round dials, golf clubs, plastic boxes for skin care products, plastic box packaging for food, etc. KC-H-TC50K, KC-H-TC70K KC-H-TC100K are typical curved hot stamping machines.

Profile transfer process

Many products are not standard flat or round surfaces, and some even have very complex surfaces. To perform hot stamping on the surfaces of such products, profile transfer technology is required: KC-H-TC120KM is a profile hot stamping machine with a floating workbench. Its workbench can float up and down so that the hot stamped product and the rubber roller are in close contact; KC-H-TC318M is a profile hot stamping machine with a floating rubber roller. The rubber roller can float along the contour of the product to complete the hot stamping.

The main material for hot stamping is electroplated aluminum, also called hot stamping foil. It is mainly composed of two thin layers, namely the polyester film substrate and the transfer layer. During hot stamping, the transfer layer is pressed on all or part of the surface of the substrate by heat and pressure. When the hot stamping is completed, the polyester film edge is torn off together with the untransferred part.

The hot stamping process is divided into four steps:

1. The hot stamping foil contacts the substrate;

2. With heat and pressure, the heat transfer layer is melted and transferred to the surface of the substrate;

3. Remove the pressure and peel off the polyester film;

4. Feed the hot stamping foil and replace it with the substrate to be hot stamped.

The perfect hot stamping effect mainly depends on the level of coordination between temperature, pressure and hot stamping time. In addition, it is also necessary to consider whether the substrate, hot stamping machine, hot stamping machine fixture and pad are suitable. Finally, it is necessary to study the environmental conditions, including indoor temperature, substrate temperature, indoor air cleanliness (dust content), temperature, etc.

1. Hot stamping foil, there are two categories: roll foil and single sheet foil. Roll foil can be divided into different models according to the substrate. The hot stamping suitability between anodized aluminum and the substrate, speed, temperature, pressure, hot stamping plate quality, plate mounting and padding technology, anodized aluminum tension adjustment, hot stamping machine condition and many other factors affect the hot stamping suitability speed, temperature and pressure. The hot stamping suitability speed, temperature and pressure are the most important. The performance of various types of anodized aluminum is different, and the suitable substrates are also different.

2. Hot stamping temperature. If the hot stamping temperature is too high, the hot stamping mark will lose its metallic luster and bubble, the edge will be unclear or even the plate will be smeared. If the hot stamping temperature is too low, it will be impossible to hot stamp, the hot stamping will not be firm or the handwriting will be hairy.

3. Hot stamping pressure. If the hot stamping pressure is too high, it will cause the plate to be smeared or the handwriting to become smeared. If the hot stamping pressure is too low, the hot stamping foil and the substrate cannot be adhered, and the hot stamping part of the hot stamping foil cannot be sheared. The installation of the hot stamping foil should not be too tight or too loose. If it is too tight, the writing will be missing strokes, and if it is too loose, the writing will be unclear and fuzzy.

4. Hot stamping speed. The hot stamping speed actually reflects the contact time between the substrate and the hot stamping foil during hot stamping, which directly affects the hot stamping fastness. If the hot stamping speed is too fast, it will cause the hot stamping to fail or the imprint to be blurred; if the hot stamping speed is too slow, it will affect both the hot stamping quality and the production efficiency.

Speed, pressure, and temperature restrict each other during the hot stamping process, and its process parameters are always determined in the order of hot stamping speed, pressure, and temperature. First determine the hot stamping speed. Under normal circumstances, it is treated as a constant and not easily changed. Then find the hot stamping pressure and hot stamping temperature that are suitable for it. In this way, the operating procedures can be simplified and the hot stamping quality can be easily controlled.

5. Hot stamping machine. According to the hot stamping method, the hot stamping machine can be divided into three types: flat-pressed flat, round-pressed flat, and round-pressed round; according to the position of the hot stamping plate, the hot stamping machine can be divided into vertical and horizontal.

6. Printing materials, hot stamping materials are also called printing materials. The printing materials for hot stamping of printed materials include offset paper, coated paper, white cardboard (cardboard), cloth paper, varnished cloth, plastic products, etc.

In addition, resin plates can also replace copper-zinc plates for hot stamping. As long as the temperature and pressure are well matched, good products can be hot stamped. 1) Temperature control is very critical. It is directly related to the quality of hot stamping. If the temperature is too high, the resin plate will be burned. The hot stamping foil will also produce adhesion due to the temperature, and the hot stamped words will be blurred. The temperature should be determined according to the quality of the tree plate. 2) Since the resin plate is tough, it is not necessary to use too much pressure, and the hot stamped words will be very clear. 3) It is best to use double-sided tape to fix the resin plate. This tape will not affect the heat insulation and is easy to control the temperature.

The operator of the hot stamping machine must concentrate, work with hands and feet simultaneously, and keep a certain distance from the hot stamping heating plate to avoid accidents. For machine adjustment, please read the random instruction manual carefully.

Pad printing is one of the special printing methods. It can print text, graphics and images on the surface of irregular heterogeneous objects, and is now becoming an important special printing. For example, the text and patterns on the surface of mobile phones are printed in this way, and the surface printing of many electronic products such as computer keyboards, instruments, and meters are all completed by pad printing.

The pad printing process is very simple. It uses a steel (or copper, thermoplastic plastic) gravure and a curved pad printing head made of silicone rubber material. The ink on the gravure is dipped onto the surface of the pad printing head, and then pressed against the required object surface to print text, patterns, etc.

There are often many printing failures in pad printing. This article summarizes the common failures in the pad printing process and organizes them into a more comprehensive pad printing failure encyclopedia.

PRINT CHINA 2019/4/14 ended perfectly. The access control data showed that the number of professional visitors exceeded 200,000 in five days. From the exhibition area, concurrent activities, trade atmosphere, to the quality of the audience, this exhibition has been highly praised by people from all walks of life, and all indicators have exceeded expectations.

Ren Yucheng, consultant of Beijing Printing Technology Association: "The exhibition is great! The exhibition technology equipment is complete, the scale is large and the order is well-organized; the forum is down-to-earth, so that visitors can gain a lot; the popularity is high, 40,000 to 50,000 people every day, and the suppliers are happy. The exhibition is wonderful, which is the greatest praise for the organizers!"

Our company exhibited the DMS cast hot embossing hot stamping machine independently developed and produced at 1211 on the 7th. On the first day of the exhibition, it attracted the attention and praise of merchants in various printing post-processing industries. The advent of the DMS cast hot embossing hot stamping machine and the emergence of cast hot embossing hot stamping technology will change the entire printing hot stamping post-processing process.

As the exhibition peaked, it attracted a large number of domestic printing companies and designer groups, as well as visitors from India, Malaysia, Thailand, South Korea, Japan, Taiwan and other regions.

In this beautiful season of spring, the market is recovering rapidly. The first [South China International Printing Exhibition/China International Label Exhibition] in the spring of 2023 was grandly held at the China Pazhou Import and Export Commodity Fair Complex from March 2 to 4.

This exhibition covers the latest development trends in the industry. As a professional and high-end digital efficiency hot stamping equipment supplier, Guangzhou Demanshi was invited to participate in this exhibition and brought the company's innovative DMS series label 3D digital UV efficiency hot stamping technology to display at 5.2B01.

With the theme of "digital, innovation, environmental protection, and intelligence", it demonstrated the digital efficiency hot stamping technology and applications enabled by digital intelligence, attracting great attention from industry professionals at home and abroad.

DMS digital UV efficiency hot stamping equipment has a variety of unique effects that traditional printing cannot achieve. It draws on the advantages of traditional hot stamping and cold stamping, and can achieve large-area fine textures that hot stamping cannot achieve, and can also achieve the embossed raised visual sense and touch three-dimensional sense that traditional cold stamping cannot achieve. No need to make plates, and you can quickly respond to the wild ideas of designers and brand owners. All applications of digital varnishing, cold foiling and hot foiling can be achieved on one digital enhancement device, which makes the hot stamping process simple, efficient and novel.

The 5th Guangzhou Printing Fair will be held in Houjie, Dongguan from April 11th to 15th, 2023. Cybernet invites you to visit Room 1068, Hall 7

The most anticipated international event in the global printing industry, the 5th China (Guangdong) International Printing Technology Exhibition (PRINT CHINA 2023) ended perfectly on April 15!

As a professional provider of high-end digital efficiency finishing technology and system solutions, we brought our company's innovative "digital efficiency hot stamping technology solution" to participate in this event. The equipment displayed on site included: DMS roll-to-roll digital efficiency hot stamping machine, DMS single-sheet digital efficiency hot stamping machine, SAPA Servo single-sheet round pressing full-automatic waste removal die-cutting machine, which brought a beautiful visual feast to the audience.

For five days, the Demanshi booth has always been the most popular gathering place at the venue. The DMS digital efficiency finishing process and colorful digital efficiency application solutions were displayed on site, such as: label efficiency application solution, cultural and creative efficiency application solution, paper box efficiency application solution, flexible packaging efficiency application solution, etc. The outstanding quality and unparalleled efficiency effect amazed the audience on site.

This exhibition attracted many visitors from home and abroad. The DMS booth was crowded with people, many big names gathered, and the exchanges were lively.

DMS has always maintained high quality standards, pursued perfection, created win-win situations, and built a harmonious ecological environment. It provides customers with perfect services with high-quality quality and leading technology.

With the development of the times, people are pursuing more outstanding printed products. Adding a perceptual dimension to color can give products a higher value.

As an innovative R&D enterprise focusing on digital hot stamping technology, Demanshi took the lead in seizing the opportunity and launched digital post-printing hot stamping equipment in 2017. No hot stamping plate is required, and functions such as local varnish, 3D relief, laser transfer, hologram, and Braille can be achieved. It integrates cold stamping and hot stamping. It has the characteristics of high efficiency, high stability, high quality, and low cost, and perfectly matches traditional printing, digital printing and other processing technologies.

As a leader and pioneer in digital hot stamping in China, Demanshi always pursues the latest and most cutting-edge technologies, constantly overcomes many current and future problems, and provides the most valuable digital hot stamping equipment and solutions for the printing industry.