Development of new technology for paper packaging printing
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1. Paper packaging development trend and technical requirements
In recent years, the global paper product packaging industry has developed rapidly, and the production capacity of cartons and cartons has increased significantly. Among the world's packaging industry output, paper packaging products exceed 32%, and in Europe, paper and paperboard consumption is as high as 41%. The per capita consumption of paper and paperboard in 2000: 331.7 kg in the United States, 249.9 kg in Japan, 229.4 kg in Taiwan, and 28.4 kg in mainland China.
In 2000, China imported 13.03 million tons of paper, cardboard and pulp (about 6 billion US dollars), accounting for 66.7% of China's paper and paperboard consumption. In recent years, the growth rate of the packaging industry in Hong Kong is about twice that of the printing industry. In 2000, the sales of packaging industry in Guangdong Province reached 50 billion yuan, including 18 billion yuan for paper packaging products and 14 billion yuan for packaging and printing.
With the further enhancement of people's environmental awareness, cartons, cartons, paper bags, paper cups, paper tubes and other packaging containers are widely used in Europe, and are used in various juices, milk, cooked food, fast food, snacks and other beverages. The carton pack of food is visible everywhere. According to relevant information from the China Tobacco Department, the proportion of domestic hard-packed cigarettes has reached 56%.
With the continuous improvement of people's living standards and the automation of packaging of goods, not only the demand for carton/carton has increased greatly, but also the printing quality and processing precision of color folding carton/multi-color carton have been put forward. . It is necessary to avoid the rabbits from discharging the waste on the automatic folding folder-gluer, so that the folding carton can automatically complete the processes of opening, molding, filling and sealing on the high-speed packaging machine, which not only requires the design of the carton structure to be reasonable, but also ensures that the film has sufficient mold. Cutting accuracy and folding paste box accuracy. Multi-color printing, short-run jobs, improved printing quality and processing accuracy, and reduced processing costs are also the market pressures and problems faced by carton packaging and printing companies. Therefore, only the application of modern processing methods and new technologies, in the process of paper packaging printing and post-press processing, continuously improve the automation of equipment, reduce the adjustment time of equipment and the auxiliary preparation time of the work, constantly adapt to the new changes in the market, to meet different The requirements of users can enhance the competitiveness of packaging and printing enterprises.
2. Paper packaging container CAD technology
The more popular carton structure CAD software on the international market, in addition to the basic functions of common interactive graphics software (high quality, rapid completion of graphics generation, editing, modification, dimensioning, etc.), should also meet the carton design Special requirements, convenient to call the box graphics library and select a satisfactory box structure, input box size (length, width, height) and cardboard thickness, you can immediately display or print the box structure diagram, automatic discharge, and Output sheet die-cutting map, printing outline drawing and backing (bottom mold) processing drawing; when the user designs or calls the required box structure drawing, as long as the cardboard web size and discharge gap are input, the material can be discharged. And compare different discharge schemes, showing optimized die-cutting discharge map and related parameters (such as the number of discharges, cardboard utilization, etc.).
In addition to selecting the standard box type and changing the shape of the carton, it is also possible to arbitrarily design the special box type, the rotating carton stereo view, and the display carton opening and closing process; for different cutting edges, creasing lines and slotted broken parts should be selected Corresponding line types, to control the carton sample, die-cutting plate, bottom mold (backing) version and die-cutting tool to improve the processing accuracy of the die-cut and backing plates and the accuracy of the carton.
3. Paper packaging printing technology
In the field of paper packaging printing, lithographic offset printing, letterpress flexo printing, gravure printing, and screen printing are all coexisting, each having its own characteristics. In the single-sheet printing, most of them use offset printing, and also use flat-press screen printing and sheet-fed gravure printing;
In web printing, most of them use gravure and flexo printing, as well as offset printing and screen printing, and several combination printing methods are also used in one printing production line.
The color of the carton is generally between 2-8 colors, of which 4 to 6 colors are used most. Folding cartons, especially the pillboxes, use more spot colors, so the number of printing color groups is mostly 6-8 colors. The number of color groups of sheetfed offset presses is generally 4 colors, basically no more than 5-6 colors, and the use of multicolor web presses (including gravure, flexo and screen printing) has increased rapidly. The number of printing color groups has reached 8-10 colors.
3.1 Offset printing technology
(1) Digital printing and CTP technology
Digital printing technology prints on the basis of personalized database information, providing paper bags, cartons and corrugated boxes with the option of individualized packaging printing, which can change the design and processing parameters of paper packaging containers by region or product. With a special process, the folding carton can have a variable printing color and hot stamping effect, in order to meet the needs of the market packaging carton (box) specifications and the number of short-running jobs.
Agfa's high-definition CTP technology provides high-quality outlets for modern packaging printing. The unique laser and optical imaging system, intelligent multi-beam simultaneous imaging method, IntelliSpot intelligent network and other technologies increase the security of the system, simplify the system structure, and improve the automation degree and overall efficiency of the system.
(2) FM screening technology
The quality of printed matter depends mainly on the number of dots on the unit area and the number of successive changes in the number of dots from small to large.
The more the number of Internet access points, the higher the definition of the printed matter, the more the number of changes in the dot, the stronger the performance of the printed matter, and the more delicate it looks.
In order to improve the quality of printed products, amplitude modulation screening, frequency modulation (FM) screening and hybrid screening technology are often used.
The network of AM modulation is a regular arrangement, depending on the size of the dot to change the amount of printing ink, and the size of the dot of the FM screening is fixed, the distance between the dots can be changed, and the printing is adjusted according to the change of the dot distance and the number of dots. The amount of ink on the paper to achieve a change in color. The amplitude modulation screening has three elements: the number of screen lines, the shape of the dot and the angle of the screen. The FM screen has only one element of the dot size. The smaller the dot, the finer the print, the better the visual effect, which is equivalent to the number of high-screen lines in the amplitude-modulated screen. However, the smaller the point of the FM screen, the higher the requirements for printing conditions. Hybrid screening is a hybrid screening technology that combines amplitude modulation and FM screening technology to form the same image. In the uniform color zone, especially in the highlight zone, conventional screening can produce a smoother appearance than FM screening. But for the high detail part, the FM screening effect is better. Advanced screening software analyzes images to determine where to use the appropriate screening geometry, and combines FM and conventional screening to achieve the best overall results.
Using FM screening technology, it can eliminate moiré, improve the uniformity of horizontal reproduction, improve the resolution and sharpness of images, and easily realize high-fidelity printing (Hi-Fi). Although FM screening is demanding on printing conditions, it is suitable for waterless printing. High-definition FM dots can significantly improve the clarity and level of presentation of prints. The FM network point arrangement is not like the AM screen point, and is limited by the dot spacing and arrangement angle. In the printing and copying, the frequency modulation dot is selected, which can show more detailed changes, improve the definition and have anti-counterfeiting function.
(3) Printing color management technology
The CP2000 integrated offset printing machine center control system developed by Heidelberg Company adopts TFT ultra-thin screen display technology, and is equipped with prepress interface technology, image control technology, printing color management system, online help system and information management system to form printing. Quality control mode under integrated conditions. The multi-level printing color management system PCM includes consulting, standardization, prepress and printing optimization, and generates and implements Icc color profile files.
In order to optimize the color process and improve the production efficiency of the printing house, the pre-press and printing equipment can be effectively coordinated. Not only can you get high fidelity color, but also save time, reduce waste, and achieve efficient production.
(4) Waterless offset printing technology
Waterless offset printing is a lithographic offset printing method that uses special silicone rubber coated plates and inks to print, eliminating the need for isopropyl alcohol or other chemical fountain solutions that are required in traditional lithographic offset printing. The printing process is simple to operate, and the ink balance is not adjusted, and the ink is transferred to the printing plate within a certain temperature range.
The printing plate used for waterless offset printing is a flat intaglio plate, and the graphic portion is lower than the surface of the printing plate. Although the plate making process is the same as the PS plate, it is different from the PS plate. Therefore, waterless offset printing plates have unique processing difficulties. Plate, ink and temperature control are the key to waterless offset printing technology, which directly affects the development speed of waterless offset printing. The printing plate is the core of waterless offset printing. The waterless offset printing plate has the advantages of easy operation, good image quality, high printing density, beautiful color and good quality of printed products, but the printing durability of the printing plate is easy to operate. Conditions and the impact of special prints. The special ink used in waterless offset printing has the characteristics of low viscosity, high viscosity, large thixotropy and stable performance. Since different colors of ink react differently to temperature changes, it is necessary to control the temperature of different printing color groups. Although the cost of consumables in waterless offset printing itself is high, the reject rate of printed products is low and the production efficiency is high. It can be seen that with the advancement of technology and the increase of labor productivity costs, especially for high-quality fine paper packaging, waterless offset printing technology has certain advantages and will be further developed and promoted.
3.2 Flexo printing technology
New flexible plate and thin plate process, sleeve plate and computer direct plate making technology, environmentally friendly UV ink, high wire ceramic anilox laser engraving technology, closed doctor blade system, gearless transmission technology, no stop change The development and application of related technologies such as roll device and automatic control technology have promoted the rapid development of flexo printing.
(1) Thin plate and CDI technology
The improvement of the quality of the photosensitive resin plate and the appearance of the thin plate process have laid a good foundation for improving the quality of the printing plate. The application of CTP technology and the emergence of digital flexographic plate making technology (CDI) can effectively overcome the phenomenon of dot enlargement and ensure the phenomenon. Print quality, shorten production cycle and reduce cost.
The digital thin sleeve plate has good stability, can effectively control the expansion of the dot, reduce the photopolymer, and improve the image quality and registration accuracy. Not only can it improve the quality of printed products in paper packaging, so that the quality of flexo printing can reach the level of offset printing and gravure printing. It also reduces printing pressure, reduces plate cleaning times, extends plate life (10-25% over time), further reduces setup time, reduces downtime, and IT at downtime (10-20%).
As technology continues to advance and the cost of various systems for the development of flexographic digital imaging platemaking systems is decreasing, the proportion of paper products such as cartons, paper bags, and multi-layer bags is increasing.
(2) Sleeve type high mesh ceramic anilox roller
The laser-engraved ceramic anilox roll is sprayed on the surface of the treated base roll as a primer layer, and then the plasma powder is sprayed with plasma at a high temperature. After being polished and polished by diamond, the laser beam is accurately engraved with a high-energy laser beam. Steep cellars, and finally fine polishing. The number of mesh lines and the amount of cell ink are the most important parameters for making laser-engraved ceramic mesh. The anilox roller with a high number of screen lines can form a thinner and more uniform ink layer, which can meet the requirements of printing with rich printing layers, especially to meet the needs of its high-gloss portion, which can reduce the expansion of the dot during printing and maintain a constant and uniform The amount of ink transferred.
Sleeve type high mesh ceramic enamel anilox roller. The ultra-high-energy laser beam engraving technology and the sleeve-type anilox roller structure consisting of a mandrel, a gas-supporting roller and a sleeve simplify the quality of the high-precision anilox roller and the quick change of the anilox roller. The plate roller and the anilox roller adopt the sleeve structure and the direct drive technology (that is, the rotation of the anilox roller is directly driven by the plate rolling), which solves the problem that the repeat length of the flexographic printing product is limited by the gear pitch. . Therefore, when replacing printed products of different circumferences, it is not necessary to replace the plate cylinder and the mandrel of the anilox roller and the gear, which greatly shortens the time taken for the printing plate to be rolled and the anilox roll when the product is replaced.
The carbon dioxide laser engraved ceramic anilox roller line can reach l000LPI, and the special ceramic layer or super-hard ceramic layer can improve the service life of the ceramic anilox roller and reduce the use cost.
The ceramic anilox roller processed by YAG laser engraving technology has smooth wall of mesh hole, neat mesh wall, high smoothness, accurate ink transfer and small blade loss. Not only the ceramic anilox roller has long service life, but also can extend the printing plate. Service life. The high-power, high-precision YAG laser engraving machine can engrave 16001pi anilox rolls.
(3) Closed double scraper cavity inking system
The two-roller, forward-squeegee-type, and reverse-squeegee-type structure can realize quantitative ink supply, but the ink is often exposed to the atmosphere in a large area, and the solvent of the solvent ink is volatilized into the surrounding air, resulting in ink characteristics. Changes and environmental pollution problems: If water-based inks are used, bubbles will be generated and the quality of the print will be affected.
The closed double-blade cavity inking system consists of a ceramic anilox roller, two scrapers, a sealing strip, an ink storage container, an ink pump, an inking hose and the like. In a fully enclosed system, the scraper, seal, gasket, and pressure plate are mounted on a hollow bracket and mechanically (or pneumatically or hydraulically) pushed toward the ceramic anilox roller and applied with a certain pressure. The ink supply tube and the return tube are respectively connected to the ink pump and the ink storage container to realize the quantitative ink supply. The reverse scraper structure is suitable for high-speed operation, which reduces the volatilization and environmental pollution of the solvent in the solvent ink. The system can also be quickly docked with an automated cleaning system for quick cleaning to reduce ink change times and downtime.
(4) Environmentally friendly flexo ink
Today, people pay more and more attention to environmental protection, water-based inks and UV inks adapt to market demand, and promote the application of flexographic printing in the field of packaging and printing. It can be used not only for the printing of various coated papers, offset papers and whiteboard papers, but also for printing carriers such as gold and silver cardboard, synthetic paper, self-adhesive paper and corrugated boxes.
Water-based (or water-based) inks use water as the main solvent, which is non-toxic, non-polluting and has no residual odor. It completely eliminates the harm of certain toxic substances in solvent inks to the human body and the pollution of packaged goods, effectively reducing air pollution. Improve environmental quality and printing environment, especially suitable for pharmaceutical, food, beverage, tea, tobacco and alcohol, and daily necessities in contact with human body.
Under ultraviolet irradiation, the photoinitiator in the UV ink is excited to decompose into a radical, and the radical causes the crosslinking reaction to occur rapidly, so that the colloidal component instantaneously becomes a solid. Because UV ink is mainly composed of pigment, photosensitive resin, reactive diluent, photoinitiator and auxiliary agent, it does not contain volatile organic solvent, which can greatly reduce the emission of VOC, and it has less energy consumption, small equipment footprint and easy drying. high productivity. Since the UV ink has no problem of volatilization of water or solvent, the transfer and reduction of the dots are good, and the color is more vivid, which greatly promotes the quality of the flexo print. Although the drying cost of the UV ink is significantly higher than that of the water-based ink, the UV ink has good photocuring efficiency and ink layer properties, and can well protect the surface of the printed product.
3.3 gravure technology
(1) Gravure electric carving technology and digital proofing
Conventional intaglio plates have engraved gravure, etched intaglio and gravure, which in turn include hand-engraved gravure and electronic engraved gravure.
The modern electronic engraving gravure has the advantages of advanced technology, low plate-making cost, high plate-making quality and stability, wide adaptability, and environmental protection. It occupies a dominant position in gravure plate making.
The modern electronic engraving system does not need to input information through the scanning unit, and all information such as image data and device driving parameters are transmitted to the electronic engraving device in a digitalized form. The key technologies of the electronic engraving system are drive circuit technology, digital signal processor application technology, AC servo technology, high frequency electromagnet technology and so on.
Intelligent and high-frequency hard-engraving technology is the main development direction of gravure electronic engraving system. The engraving system is intelligent, including automatic trial carving, automatic rapid crossing of non-engraving areas, automatic replacement of the cylinder and so on. The engraving frequency is the bottleneck affecting the efficiency of the electro-engraving system. Therefore, the development of higher frequency electromagnetic engraving heads has always been the main research direction of electric engraving system manufacturers.
Gravure proofing has analog and digital methods. The gravure proofing machine is made by simulating the gravure printing machine. The ink is transferred to the substrate by the rolling action between the impression cylinder and the gravure cylinder to form a clear pattern. The digital proofer uses inkjet and electronic imaging proofing. The use of digital technology to obtain high-resolution mesh proofs directly on thermal transfer materials can effectively reflect subtle levels. Although the proof color of digital proofing is currently difficult to achieve the color reproduction effect of the transparency and density of the gravure ink. However, digital proofing has the characteristics of high production efficiency, reliability and convenience, and is an important trend in the future development.
(2) Improvement of gravure ink
As people's environmental awareness increases, the environmental pollution problems caused by traditional solvent-based inks are also paid more and more attention. With the technological advancement of a new generation of water-soluble polymers, water-based inks have been successfully applied to the gravure printing process of paper packaging products such as cigarette packets and wine labels, achieving the printing of toluene-free inks, avoiding solvent-based inks for the environment and operators. The pollution caused. Water-based inks have shown tremendous impact on the packaging market and significant growth potential, which is the direction of the development of the ink industry. Waterborne coatings will also gradually replace solventborne coatings.
In Europe and the United States, more than 90% of printing companies use water-based inks that are non-toxic to the human body and environmentally friendly, to print tobacco and alcohol boxes, medicine boxes, food boxes and daily necessities packaging boxes (boxes), avoiding the ecological environment. harm. In the field of gravure printing abroad, the replacement of solvent-based inks by water-based inks has become an inevitable development trend.
The water-based gravure aluminum box ink is a volatile and dry heat-curable ink mainly composed of a film-forming substance, a coloring agent, an additive and a co-solvent. Film-forming substances are a key part in determining the physical properties of inks. Water-soluble acrylic resins and water-soluble self-crosslinking emulsion component colorants are often used as alkali-resistant materials. The water-based gravure ink has the characteristics of non-toxic, odorless, good transfer performance and fastness, and is suitable for rotary gravure printing.
(3) Advanced technology of gravure printing equipment
Most of the advanced foreign gravure printing machines use the sleeve type impression cylinder and the plate rolling direct drive technology. The sleeve type impression cylinder has the advantage of quick change of the drum, and the need to break the strip without replacing the impression cylinder, thereby reducing material waste. The plate cylinders of each printing unit are directly driven by a single motor, longitudinal registration is achieved during the imprinting process, and a stepper motor is moved to control the lateral registration. The main advantage of the independent drive is that it does not require mechanical drive shaft and register compensation roller mechanism, mechanical parts are reduced, and the length of the tape is shortened, which is beneficial to improve printing quality and printing speed.
The quick change, positioning and installation system can effectively reduce the device auxiliary time and improve work efficiency. At present, the advanced foreign gravure printing machine adopts pneumatically mounted squeegee blade fixing clips and printing cymbals, carts, rapid positioning and installation, etc., to achieve quick replacement of the workpieces.
3.4 Screen printing new technology
Screen printing has the characteristics of thick ink layer, rich graphics and graphics, strong stereoscopic effect and wide printing materials. It has gradually increased its application in high-grade tobacco and alcohol and food packaging cartons.
The use of UV screen ink to print frost, refraction, ice, wrinkles and other effects on the cigarette case greatly stimulates the consumer's desire to purchase. However, due to the flat printing speed, the printing speed is low, the ink curing speed is slow, the printing quality is difficult to control, and the printing material consumption is large, which cannot meet the needs of the cigarette carton size and mass production. It adopts high-speed rotary screen printing production line, which has fast printing speed, high productivity, stable printing quality and low consumption. It has changed the traditional flat-press screen printing, manual paper feeding and ink supply. It is suitable for high-speed automatic and large-scale mass production. Fold the paper tray.
Web Rotary Screen Printing uses a nickel metal circular screen plate, a built-in squeegee and an automatic ink supply system that transfers the printing ink from the round screen to the surface of the substrate supported by the impression cylinder. The entire printing process is controlled automatically by the computer from paper feeding, ink supply, color registration, and UV dry bathing. The circular screen printing plate is made of 100% nickel non-woven fabric material, and the mesh is formed into a hexagonal wire-shaped hole by electroforming, and the entire mesh surface is flat and thin to ensure the stability and precision of the printing. Suitable for large format rotary printing, the maximum speed can reach 125m/min, and the screen can be reused 15 times. Therefore, the web rotary screen printing can meet the requirements of special effects such as printing frosting and ice painting, and can directly print holographic anti-counterfeiting marks, embossing and die-cutting, and realize high-speed automatic printing of paper boxes.
The environmentally friendly UV silk screen imitation metal etching ink is mainly composed of an oligomer (ie, a photocurable resin), a reactive diluent (ie, a photosensitive crosslinking monomer), a photopolymerization initiator, and a filler. Printing on gold and silver cardboard, UV screen imitation metal etching ink is quickly cured under ultraviolet light, and the surface of the printed matter has a matte effect.
Under the external light irradiation, the photopolymerization initiator in the UV ink absorbs photons of a certain wavelength and is excited to an excited state to form a radical or an ion. Then, by transferring the intermolecular energy, the polymer such as the polymerizable prepolymer and the photosensitive monomer is brought into an excited state to generate a charge transfer complex; the complex is continuously crosslinked and solidified into a film. UV inks are selectively absorbed by photons of ultraviolet light.
The dryness of the UV ink is affected by the total energy of the UV light source and the distribution of the light energy at different wavelengths. Solving the matching of UV ink and UV light source is beneficial to speed up the drying speed of ink, improve labor productivity and energy utilization, and reduce production cost.
4. Surface finishing and molding processing technology
4.1 Waterborne glazing and UV glazing
The film coating process is simple and inexpensive, but since the paper after the film is difficult to be recycled, it is not degradable and easily causes white pollution, and long-term use may endanger the health of workers. Therefore, the conventional instant coating adhesive material will be replaced by a high quality environmentally friendly new adhesive. Polishing not only enhances the surface brightness, protects printed graphics, but also does not affect the recycling and reuse of paper, saving resources and protecting the environment. Therefore, it is widely used in the surface processing of paper packaging prints. Varnish coatings mainly include solvent varnish, waterborne varnish, UV varnish and the like. Due to the poor efficacy of solvent varnish and environmental protection, the application range is greatly limited.
Water-based glazing oil uses water as solvent, non-toxic and tasteless, eliminating harm to the human body and environmental pollution. It has fast drying speed, stable performance, good wear resistance of glazing surface, wide applicability after printing, and heat. With good sealing performance and safe and reliable use, it is more and more valued by food, medicine and tobacco carton packaging and printing enterprises.
UV glazing relies on the irradiation of ultraviolet light to cause a chemical reaction inside the UV coating to complete the curing process. Due to the action of ultraviolet rays, UV drying is instantaneous, and there is no evaporation of the solvent during curing, which does not cause environmental pollution. UV varnish printing, high surface gloss, heat resistance, abrasion resistance, water resistance, light resistance, but due to the high price of UV coating oil, high performance requirements on the machine, therefore, currently only used in high-grade carton Light.
4.2 hot stamping technology
In the fierce market competition, in order to increase the added value of products, more effective packaging anti-counterfeiting, more and more packaging cartons use hot stamping process.
Hot stamping has common hot stamping, cold stamping, bump hot stamping and holographic hot stamping. The common hot stamping process is flat stamping and round stamping, because the round stamping is a line contact. It has the characteristics of hot stamping substrate, suitable for large-area hot stamping, high stamping accuracy, and is widely used.
Cold stamping does not require the use of a heated metal plate, but the transfer of the metal foil using a printed adhesive. The cold stamping process has low cost, energy saving and high production efficiency, and is a new process with great development prospects.
Bump stamping (also known as three-dimensional hot stamping) is the use of modern engraving technology to make the upper and lower male and female molds, hot stamping and embossing process is completed at one time, improving production efficiency. The mold made by electric engraving can be curved to achieve a three-dimensional relief effect that is difficult to achieve by a general corrosion method. The appearance of bump hot stamping enables the hot stamping and pressing process to be completed at the same time, reducing the number of processes and scraps caused by inaccurate overprinting.
The holographic logo uses computer technology to change the amplitude and frequency of the grating, making it more brilliant and clearer than the color of the calculated pattern. If such a hologram is used as a copy of the original, a large amount of holographic loss is generated, thereby achieving the purpose of anti-counterfeiting. The holographic logo can not only have very good anti-counterfeiting performance, but also can make the special number or text into the holographic logo according to the customer's needs, and the application on the high-grade carton packaging is more and more extensive.
4.3 Die cutting technology
(1) Die cutting plate and its processing technology
Die-cut plates: In addition to the multi-layer wood-glued version (MULTIPLEX) currently used in China, the fiber-plastic version (DURAMA) and the sandwich plate (SANDWICH) are also popular in foreign countries. The life of the die-cut version depends mainly on the quality of the tangent knife and the number of tool changes. The fiber plastic version and the sandwich steel plate not only have high precision, but also overcome the shortcomings of the multi-layer wood glued plate which are susceptible to humidity and temperature changes; and the number of tool changes is 3 times and 6 times more than the multi-layer wood glued version. In foreign countries, in addition to high-pressure water jet slotting for fiber plastic plates, multi-layer wood gluing plates and sandwich steel plates are generally made by laser-cut square calligraphy.
Die-cut laser cutting system Die-cutting laser cutting system consists of laser processing head, computer-aided design (CAD) software, computer numerical control device (CNC), workbench and so on. The pattern is cut by the relative movement of the workbench and the laser beam, and the bridge, bridge and cut frame programs should be programmed according to the process requirements to determine the optimal path for the die-cut laser cutting. The expert system automatically selects the optimum process parameters (power, speed, pressure, etc.) based on the type, performance, thickness and processing requirements of the sheet. The application of laser cutting die cutting is not only fast, but also high precision. Moreover, it has good repeatability, especially when cutting multiple joints and repeating die-cutting.
The die-cutting tool forming system automatically calculates the length of the die-cutting knife and the indentation knife and the size of the bridge gap by using the CAD software to ensure the precision of the die-cutting plate, and transmits it to the tool forming machine for automatic slotting, chamfering, bending and Cut off.
(2) bottom mold (backing) CAM system
When processing the backing with a computer-assisted engraving machine, the indentation groove width and cutting depth and accuracy should meet the requirements and the engraving speed and depth should be adjustable. The application of CAM technology not only shortens the production cycle, but also improves the manufacturing precision of the carton.
(3) Box proofing and direct production technology
The multi-function carton sample CAM system is equipped with a combined cutter and press knife. When the control part receives the execution instruction, the execution part automatically selects the indentation, the cutting tool according to the type of the cardboard, and the structural data and program according to the computer aided design. Automatic drawing, indentation, cutting and automatic tool change.
It can process paperboard with a weight less than 1500g/mm and paperboard with a thickness of B corrugated to 3 layers of corrugated. Processing small batches of standard paper trays can greatly reduce processing costs.
(4) Die cutting method
Sheet-fed flat die-cutting relies on the front gauge and side gauge mechanical positioning, while the in-line flat-press die-cutting is based on the printed mark and does not have a gripper row, in order to achieve continuous transmission of the rotary printing unit paper. The transition to the intermittent movement of the die cutting station usually consists of an adjustable eccentric mechanism in the paper feed.
The online round die-cutting production line is a roll-to-roll die-cutting and hot-printing production line specially designed for the production of high-grade cigarette boxes. Its main feature is hot stamping, stamping and die printing of printed webs. A series of operations such as cutting and stripping, so that the printed sheets are processed into a final product at one time. It avoids a series of quality problems caused by the old process, the common hot stamping and holographic hot stamping, and the high scrap rate. It also reduces equipment investment and floor space, and saves a lot of operators and shortens. The production cycle. Due to the continuous improvement of the performance of hot stamping materials and the development and application of high-quality new materials, the current maximum speed of web circular die-cutting and hot-printing linkage production equipment can reach 180mm/min.
Since the circular pressing and hot stamping and die cutting are line contact, the line pressure during die cutting is much smaller than the flat pressing surface contact pressure, so that the equipment power is small and the smoothness is good; since it is continuous rolling die cutting, the production efficiency is high. The maximum die cutting speed can reach 350m/min. The circular die-cutting machine is equipped with a high-precision registration device and a die-cutting phase adjustment device to achieve a relatively high die-cutting accuracy.