The hot stamping embossing process has been used for a long time in the printing process of packaging cartons. Its purpose is to cater to consumers' preference for gold or other metallic colors by bronzing and embossing, highlighting the logos or specific patterns on the packaging carton. Enhance the quality of the packaged goods; at the same time, it will increase the sales unit price through the implementation of multiple processes for the packaging manufacturers. At the same time, due to the increase of production difficulty, it also reduces the pressure of competition from another aspect.
In recent years, the domestic bronzing and embossing processes have come out with some new development trends. With the increase in the processing level of bronzing foils and bronzing plates and the use of new machinery and equipment, high-speed bronzing (flat pressing speeds of more than 5,000 sheets per hour. ), three-dimensional hot stamping, aluminum foil surface bronzing, one-time positioning bronzing, enamel surface bronzing, and hot stamping surface printing, etc. began to be applied in cigarette packs. In foreign countries, the same bronzing process is also used in cosmetics boxes, wine labels, coins, and so on. In this regard, the technical level of domestic manufacturers is rapidly approaching the international advanced level, and even at the level of equipment, it has exceeded the average level in Europe and America.
First, the three-dimensional bronzing three-dimensional hot stamping that is stamping and stamping once completed.
It is well known that bronzing can be heated to transfer the metal coating on the surface of the galvanized foil to the surface of the paper. Here, in addition to equipment, various related materials, such as anodized aluminum, hot stamping and surface conditions, printing methods, etc., will affect the bronzing and embossing results. Here's a brief introduction.
1, the impact of the device on the hot stamping embossing Hot stamping and embossing are usually flat and flat, round flat, round pressure round several processes.
The flat stamping and die-cutting die-cutting equipment is represented by BOBST equipment and is developing in the direction of high speed, high precision, and convenience of use. It is the main working method for hot stamping and embossing. Bobst hot stamping machine has reached the hot stamping speed of 7,500 sheets per hour, and the accuracy can be kept within plus or minus 01.MM. Replacement of aluminum or change plate has formed its unique method, easy to operate.
With the installation of holographic positioning probes, with the precise control of anodized aluminum, it is possible to achieve holographic positioning and bronzing.
Round hardness flat stamping die cutting equipment is mainly modified Heidelberg letterpress machine, the advantage of spring is a large area of ​​bronzing processing, flat pressing method is mature. However, the machine speed is slow, and it is impossible to process three-dimensional hot stamping. Domestic manufacturers also install positioning probes. However, the probe device is located in the honeycomb plate. The advantage is that a single hot stamping is better positioned, and it is affected by the heating of the honeycomb plate, and adjustment is difficult. .
Round press methods are commonly used for web in-line processing. Due to the processing costs of the bronzing plate, it is only suitable for special plates.
2, the impact of hot stamping on the hot stamping bump The domestic most commonly used hot stamping version is still corroded copper plate, usually 2MM thick, by riveting it to another thick copper or aluminum plate to use. The advantage of this version is its low cost. The disadvantage is that it can only be used for flat hot stamping. The life of the hot stamping version is short. Generally, 100,000 hot stamping buttons need to be replaced. It usually takes several hours to replace the hot stamping version. This will increase the cost of the machine. In particular, the loss is considerable on higher-priced hot stamping machines such as Bobst's hot stamping machines.
National cuisine has now been widely used carved brass plate. Through the electric and control software, three-dimensional engraving was carried out according to the image I scanned in advance. The bronzing plate produced in this way cooperates with the predicted relief plate to carry out three-dimensional bronzing, or one-time molding of hot stamping and embossing. The bronzing plate made by this method usually uses 7MM brass plate, and the service life can reach more than 1 million times. It is especially suitable for long-lived work, which can greatly reduce the downtime change time, and because brass is harder than copper, it is small. The pattern is more ideal. The disadvantage is that the production cost is much higher than the corrosion method.é’½ ä» é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½. In the past, such a bronzing version had to be processed in Europe or the United States. In addition to the cost and delivery time, it was difficult to meet the requirements. Due to the different cultural backgrounds, the understanding of patterns and texts was not uniform and it was often difficult to meet the requirements. At present, domestic manufacturers have been able to process this bronzing version, which facilitates the use of users, and in particular facilitates the communication between the processing manufacturers and designers, and can correctly understand the design intent so as to meet the requirements of users.
3, concave and convex mold on the impact of hot stamping and embossing The domestic common method is to use gypsum in the machine to produce concave and convex bottom mold, its advantages are low cost, the disadvantage is that the processing time is very long, the replacement is complicated. Glass fiber materials can now be prefabricated and can be used to make holes with the processed copper plate for easy positioning.
4. The effect of electro-aluminum foil on hot stamping and embossing is shown in Fig. 2. Aluminum foil is usually composed of multiple layers of coatings. The leather is usually PE; the release coating on the substrate, the role is to release other coatings after heating; followed by color coating, metal coating (aluminum) and glue coating.
The speed and quality of bronzing are mainly affected by the release coating and the glue coating. If these coatings are not sensitive to heat, the bronzing speed will be reduced accordingly. In the past, due to the limitation of the heat transfer speed, the flat pressing bronzing speed could not reach 5000 sheets/hour. However, at present, some of the world's leading suppliers of aluminum glue formulations, the production of aluminum has been sufficient to meet the industry's requirements for bronzing speed. In the Bobst bronzing phase, a bronzing speed of 7,500 sheets/hour has been achieved.
In the past, people generally believed that flat pressing and hot stamping machines could not carry out large-scale hot stamping, and now they have also achieved breakthrough. The Bobst hot stamping machine has achieved full-width foil stamping on facing papers. Of course, due to the need for sufficient heat transfer, the speed is quite high. Limited, only 1800 sheets/hour. However, this speed is not lower than the corresponding speed achieved on a round flattening hot stamping machine.
For different paper surface printing surface, the glue formula of the aluminum foil needs to be adjusted accordingly.
At present, domestic and foreign countries are involved in the gold and silver cardboard surface bronzing or UV ink surface bronzing and other difficult points, Tong Nanning City matters glue formula can be resolved.
Second, the hologram positioning bronzing hologram positioning bronzing is now a hot topic. Due to the difficulty in manufacturing holographic aluminum, there are only a few manufacturers in the world that can manufacture qualified holographic aluminum. At the same time, only a few bronzing machines capable of quasi-determined bronzing can be manufactured, and the investment cost is quite high. Therefore, the hologram Positioning bronzing is usually used for child falsification, such as counterfeiting.
In China, due to the seriousness of cigarette fraud, holographic positioning stamping is first applied to cigarette pack security. At the same time, because only high-priced cigarettes have enough space to use holographic stamping, tobacco companies also use holographic stamping to improve product quality.
Some of the new processes and technologies mentioned above are involved in the domestic packaging industry. Generally speaking, the use of bronzing processes in China or Asia is much higher than in other regions. This may be a reflection of ethnic habits. Correspondingly, some domestic enterprises have reached a very high standard in the bronzing process.
In June of this year, Bobst of Switzerland organized a press conference for a new type of hot stamping machine, and invited the cradle households and material supply products from the industry to participate in the seminar and held technical exchange seminars. Domestic manufacturers also participated in the survey, which generally reflected a large amount of revenue. BOBST will also hold similar exchanges in its Shanghai factory in November.
In recent years, the domestic bronzing and embossing processes have come out with some new development trends. With the increase in the processing level of bronzing foils and bronzing plates and the use of new machinery and equipment, high-speed bronzing (flat pressing speeds of more than 5,000 sheets per hour. ), three-dimensional hot stamping, aluminum foil surface bronzing, one-time positioning bronzing, enamel surface bronzing, and hot stamping surface printing, etc. began to be applied in cigarette packs. In foreign countries, the same bronzing process is also used in cosmetics boxes, wine labels, coins, and so on. In this regard, the technical level of domestic manufacturers is rapidly approaching the international advanced level, and even at the level of equipment, it has exceeded the average level in Europe and America.
First, the three-dimensional bronzing three-dimensional hot stamping that is stamping and stamping once completed.
It is well known that bronzing can be heated to transfer the metal coating on the surface of the galvanized foil to the surface of the paper. Here, in addition to equipment, various related materials, such as anodized aluminum, hot stamping and surface conditions, printing methods, etc., will affect the bronzing and embossing results. Here's a brief introduction.
1, the impact of the device on the hot stamping embossing Hot stamping and embossing are usually flat and flat, round flat, round pressure round several processes.
The flat stamping and die-cutting die-cutting equipment is represented by BOBST equipment and is developing in the direction of high speed, high precision, and convenience of use. It is the main working method for hot stamping and embossing. Bobst hot stamping machine has reached the hot stamping speed of 7,500 sheets per hour, and the accuracy can be kept within plus or minus 01.MM. Replacement of aluminum or change plate has formed its unique method, easy to operate.
With the installation of holographic positioning probes, with the precise control of anodized aluminum, it is possible to achieve holographic positioning and bronzing.
Round hardness flat stamping die cutting equipment is mainly modified Heidelberg letterpress machine, the advantage of spring is a large area of ​​bronzing processing, flat pressing method is mature. However, the machine speed is slow, and it is impossible to process three-dimensional hot stamping. Domestic manufacturers also install positioning probes. However, the probe device is located in the honeycomb plate. The advantage is that a single hot stamping is better positioned, and it is affected by the heating of the honeycomb plate, and adjustment is difficult. .
Round press methods are commonly used for web in-line processing. Due to the processing costs of the bronzing plate, it is only suitable for special plates.
2, the impact of hot stamping on the hot stamping bump The domestic most commonly used hot stamping version is still corroded copper plate, usually 2MM thick, by riveting it to another thick copper or aluminum plate to use. The advantage of this version is its low cost. The disadvantage is that it can only be used for flat hot stamping. The life of the hot stamping version is short. Generally, 100,000 hot stamping buttons need to be replaced. It usually takes several hours to replace the hot stamping version. This will increase the cost of the machine. In particular, the loss is considerable on higher-priced hot stamping machines such as Bobst's hot stamping machines.
National cuisine has now been widely used carved brass plate. Through the electric and control software, three-dimensional engraving was carried out according to the image I scanned in advance. The bronzing plate produced in this way cooperates with the predicted relief plate to carry out three-dimensional bronzing, or one-time molding of hot stamping and embossing. The bronzing plate made by this method usually uses 7MM brass plate, and the service life can reach more than 1 million times. It is especially suitable for long-lived work, which can greatly reduce the downtime change time, and because brass is harder than copper, it is small. The pattern is more ideal. The disadvantage is that the production cost is much higher than the corrosion method.é’½ ä» é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½ é’½. In the past, such a bronzing version had to be processed in Europe or the United States. In addition to the cost and delivery time, it was difficult to meet the requirements. Due to the different cultural backgrounds, the understanding of patterns and texts was not uniform and it was often difficult to meet the requirements. At present, domestic manufacturers have been able to process this bronzing version, which facilitates the use of users, and in particular facilitates the communication between the processing manufacturers and designers, and can correctly understand the design intent so as to meet the requirements of users.
3, concave and convex mold on the impact of hot stamping and embossing The domestic common method is to use gypsum in the machine to produce concave and convex bottom mold, its advantages are low cost, the disadvantage is that the processing time is very long, the replacement is complicated. Glass fiber materials can now be prefabricated and can be used to make holes with the processed copper plate for easy positioning.
4. The effect of electro-aluminum foil on hot stamping and embossing is shown in Fig. 2. Aluminum foil is usually composed of multiple layers of coatings. The leather is usually PE; the release coating on the substrate, the role is to release other coatings after heating; followed by color coating, metal coating (aluminum) and glue coating.
The speed and quality of bronzing are mainly affected by the release coating and the glue coating. If these coatings are not sensitive to heat, the bronzing speed will be reduced accordingly. In the past, due to the limitation of the heat transfer speed, the flat pressing bronzing speed could not reach 5000 sheets/hour. However, at present, some of the world's leading suppliers of aluminum glue formulations, the production of aluminum has been sufficient to meet the industry's requirements for bronzing speed. In the Bobst bronzing phase, a bronzing speed of 7,500 sheets/hour has been achieved.
In the past, people generally believed that flat pressing and hot stamping machines could not carry out large-scale hot stamping, and now they have also achieved breakthrough. The Bobst hot stamping machine has achieved full-width foil stamping on facing papers. Of course, due to the need for sufficient heat transfer, the speed is quite high. Limited, only 1800 sheets/hour. However, this speed is not lower than the corresponding speed achieved on a round flattening hot stamping machine.
For different paper surface printing surface, the glue formula of the aluminum foil needs to be adjusted accordingly.
At present, domestic and foreign countries are involved in the gold and silver cardboard surface bronzing or UV ink surface bronzing and other difficult points, Tong Nanning City matters glue formula can be resolved.
Second, the hologram positioning bronzing hologram positioning bronzing is now a hot topic. Due to the difficulty in manufacturing holographic aluminum, there are only a few manufacturers in the world that can manufacture qualified holographic aluminum. At the same time, only a few bronzing machines capable of quasi-determined bronzing can be manufactured, and the investment cost is quite high. Therefore, the hologram Positioning bronzing is usually used for child falsification, such as counterfeiting.
In China, due to the seriousness of cigarette fraud, holographic positioning stamping is first applied to cigarette pack security. At the same time, because only high-priced cigarettes have enough space to use holographic stamping, tobacco companies also use holographic stamping to improve product quality.
Some of the new processes and technologies mentioned above are involved in the domestic packaging industry. Generally speaking, the use of bronzing processes in China or Asia is much higher than in other regions. This may be a reflection of ethnic habits. Correspondingly, some domestic enterprises have reached a very high standard in the bronzing process.
In June of this year, Bobst of Switzerland organized a press conference for a new type of hot stamping machine, and invited the cradle households and material supply products from the industry to participate in the seminar and held technical exchange seminars. Domestic manufacturers also participated in the survey, which generally reflected a large amount of revenue. BOBST will also hold similar exchanges in its Shanghai factory in November.