1. Paper packaging development trends 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. In the world's packaging industry output value, paper packaging products exceed 32%, and in Europe, the consumption of paper and cardboard is as high as 41%. Per capita paper and cardboard consumption in 2000: 331.7 kg in the US, 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, paperboard and pulp (about 6 billion US dollars), accounting for about 66.7% of China's paper and paperboard consumption. In recent years, the growth rate of Hong Kong's packaging industry is about twice that of the printing industry. In 2000, the sales of packaging industry in Guangdong reached 50 billion yuan, of which 18 billion yuan was for paper packaging products and 14 billion yuan for packaging and printing.
As people's environmental awareness is further enhanced, packaging containers such as cartons, cartons, paper bags, paper cups, and paper tubes are more and more widely used in Europe. They are used in various juices, milk, cooked food, fast food, snacks and other beverages. Food cartons are everywhere. According to relevant information reported by 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 degree of automation of commodity packaging, not only the demand for cartons / cartons has increased greatly, but also the higher quality requirements for the printing quality and processing accuracy of color folding cartons / multicolor cartons . To avoid rabbits producing waste products on the automatic folding and gluing machine, so that the folding carton can automatically complete the processes of opening, forming, filling, and sealing on the high-speed packaging machine. Not only the reasonable design of the carton structure but also the box must have sufficient mold Cutting accuracy and folding paste box accuracy. Multi-color printing, the increase of short-form jobs, improving printing quality and processing accuracy, and reducing processing costs are also market pressures and problems faced by carton packaging and printing companies. Therefore, only by applying modern processing methods and new technologies, in the process of paper packaging printing and post-press processing, can we continuously improve the degree of automation of equipment, reduce the adjustment time of equipment and the auxiliary preparation time of live parts, and constantly adapt to new changes in the market to meet different needs. The requirements of users can improve the competitiveness of packaging and printing enterprises.
2. CAD technology of paper packaging container
In addition to the basic functions of commonly used interactive graphics software (high-quality, fast completion of graphics generation, editing, modification, dimensioning, etc.), the popular carton structure CAD software on the international market should also meet the carton design. Special requirements, easily call the box graphics library and select a satisfactory box-shaped structure. After entering the box body size (length, width, height) and cardboard thickness, the box structure diagram can be displayed or printed immediately, and the material is automatically discharged, and Output box die cutting layout drawing, printing outline drawing and backing (bottom die) processing drawing; when the user designs or calls the required box sheet structural drawing, as long as the paper board size and discharge gap are input, the material can be discharged And compare different layout schemes, display optimized die cutting layout diagram and related parameters (such as the number of layout, cardboard utilization, etc.).
In addition to selecting the standard box shape and changing the shape of the carton, you can also arbitrarily design a special box shape, rotate the carton perspective, and display the opening and closing process of the carton; for different cutting edges, indentation lines, and slotted and broken parts, you should choose Corresponding line types, to control the production of carton samples, die-cutting plates, bottom mold (backing) plates and die-cutting tools to improve the processing accuracy of die-cutting plates and backing plates and the precision of carton production.
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3. Paper packaging printing technology
In the field of paper packaging and printing, lithographic offset printing, letterpress flexo printing, gravure printing, and silk screen printing coexist, with their own characteristics. Most of the single-sheet cardboard printing adopts offset printing, and there are also flat-press screen printing and single-sheet gravure printing;
In web printing, gravure and flexo printing methods are mostly used, offset printing and screen printing methods are also used, and several combined printing methods are also used on one printing production line.
The printing color of the carton is generally between 2-8 colors, of which 4 to 6 colors are the most used. Folding cartons, especially medicine boxes, often use spot colors, so the number of printing color sets is mostly 6-8 colors. The number of color sets of sheet-fed offset printing presses is generally 4 colors, basically no more than 5 ~ 6 colors, while the use of multi-color web printing 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 according to the database information with personalized choices, providing paper bags, cartons and corrugated boxes with personalized packaging and printing options. It can change the design and processing parameters of paper packaging containers according to regional or product differences. Using special processes, the folding carton can have variable printing colors and hot stamping effects to meet the needs of the market with a large number of packaging cartons (boxes) and a large number of short live jobs.
The high-definition CTP technology developed by Agfa can provide high-quality outlets for modern packaging and printing. The use of unique laser and optical imaging systems, intelligent multi-beam simultaneous imaging methods, IntelliSpot intelligent outlets and other technologies increase the security of the system, simplify the system structure, and increase the degree of automation and overall efficiency of the system.
(2) FM screening technology
The quality of printing is mainly determined by the number of dots per unit area and the number of dots that change continuously from small to large.
The greater the number of internet access points in the bit area, the higher the clarity of the printed matter, and the more the dot changes, the stronger the expressiveness of the printed matter, and the more delicate it looks.
In order to improve the quality of printing, amplitude modulation screening, frequency modulation (FM) screening and hybrid screening techniques are often used.
The dots of amplitude modulation and screening are arranged regularly, and the size of the printing ink is changed according to the size of the dots, while the dot size of the frequency modulation and screening is fixed and the distance between the dots can be changed. The amount of ink on the paper changes the color. Amplitude modulation screening has three elements: the number of screen lines, the shape of the dots, and the angle of the screen, while FM screening has only one element, the size of the dots. The smaller the dots, the finer the printed matter, the better the visual effect, which is equivalent to the high number of screen lines during amplitude screening, but the smaller the dots for FM screening, the higher the requirements for printing conditions. Hybrid screening is a hybrid screening technology that combines amplitude modulation and frequency modulation screening technology to form on the same image. In the city of uniform tone, especially in the highlight area, conventional screening can produce a smoother appearance than FM screening. But for high-detail parts, FM screening is better. Advanced screening software can analyze the image to determine where to use the appropriate screening geometry, and combine FM screening with conventional screening to achieve the best overall effect.
The application of FM screening technology can eliminate moire, improve the uniformity of gradation reproduction, improve the resolution and clarity of images, and easily realize high-fidelity printing (Hi-Fi). Although FM screening has strict requirements on printing conditions, it is very suitable for the waterless printing process. High-definition FM dots can significantly improve the clarity and level of expressiveness of printed matter. The arrangement of FM dots is not limited by the pitch of dots and the angle of arrangement like the amplitude modulation dots. Choosing FM dots in printing and copying can show more detailed changes, improve the clarity, and have anti-counterfeiting functions.
(4) Printing color management technology
The CP2000 integrated offset press central control system developed by Heidelberg uses TFT ultra-thin screen display technology, and is equipped with pre-press interface technology, image control technology, printing color management system, online help system and information management system, etc., forming a printing Quality control mode under integrated conditions. Multi-level printing color management system PCM, including consulting, standardization, pre-press and printing optimization, generating and implementing Icc color profile and other content.
With the aim of optimizing the color process and improving the production efficiency of the printing plant, the pre-press and printing equipment are effectively coordinated. Not only can you get high-fidelity colors, but you can also save time, reduce waste, and get efficient production.
(5) Waterless offset printing technology
Anhydrous offset printing is a lithographic offset printing method that uses special silicone rubber coated plates and inks for printing. It does not require isopropyl alcohol or other chemical fountain solutions necessary for traditional lithographic offset printing. The printing process is simple to operate, without adjusting the water-ink balance relationship, and transfers the ink 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 part 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, colorful colors, and good printing quality. However, the durability of the printing plate is easy to operate Effects of conditions and special prints. The special ink used in waterless offset printing has the characteristics of low viscosity, high viscosity, large thixotropy and stable performance. Because different colors of ink respond differently to temperature changes, it is necessary to control the temperature of different printing color groups. Although the cost of consumables for waterless offset printing is relatively high, the waste rate of printed products is low and the production efficiency is high. It can be seen that with the progress 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.
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3.2 Flexo printing technology
New flexible plate and thin plate technology, sleeve plate and computer direct plate making technology, environmentally friendly UV ink, high net line ceramic anilox laser engraving technology, closed doctor blade system, gearless transmission technology, non-stop replacement 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 printing 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 the CTP technology and the appearance of the digital flexible plate-making technology (CDI) can effectively overcome the phenomenon of network expansion and ensure Print quality, shorten production cycle and reduce cost consumption.
The digital thin sleeve printing 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 improve the printing quality of paper packaging, so that the quality of flexo printing reaches the quality level of offset printing and gravure printing. It can also reduce printing pressure, reduce plate cleaning times, extend plate service life (the time limit can be increased by 10-25%), further shorten the preparation time of the machine, reduce the number of downtimes and downtime IT (10-20%).
The CDI system jointly developed by DuPont and Dupont Seri can directly transfer digitized information to the laser photosensitive printing plate. The CDI plate-making machine SparkXT developed by Esko-Graphics is mainly aimed at the packaging and printing market, especially small and medium-sized label and folding carton flexo printing enterprises. As technology continues to advance and various systems have successively introduced flexo digital imaging plate-making systems, the cost is also decreasing, and the proportion of paper products such as cartons, paper bags, and multi-layer packaging bags is increasing.
(2) Sleeve type high mesh wire ceramic anilox roller
The laser engraved ceramic anilox roller is sprayed with alloy on the surface of the treated base roller as a base layer, and then sprayed with ceramic powder at high temperature. After diamond grinding and polishing, a high-energy laser beam is used to accurately carve out a clear outline. The steep net hole is finally fine-polished. The number of mesh lines and the amount of mesh ink are the most important parameters for making laser engraved ceramic mesh. The anilox roller with high screen count can form a thinner and more uniform ink layer, which can meet the requirements of printing with rich layers of layers, especially to meet the needs of its high-gloss part. It can reduce the expansion of dots during printing and maintain a constant and uniform Ink transfer volume.
Sleeve type high mesh wire ceramic urn anilox roller. Using ultra-high-energy laser beam engraving technology and a sleeve-type anilox roller structure composed of a mandrel, an air support roller, and a sleeve, not only ensuring the quality of the high-precision anilox roller, but also realizing rapid replacement of the anilox roller The plate cylinder and the anilox roller adopt a sleeve structure and direct drive technology (that is, the rotation of the anilox roller is directly driven by the plate roller), which solves the problem that the repeated length of the printed product of the flexo printing machine is limited by the gear pitch . Therefore, when replacing printed products with different circumferences, there is no need to replace the mandrels and gears of the plate cylinder and anilox roller, which greatly reduces the time it takes to replace the platen roller and anilox roller when replacing the product.
The carbon dioxide laser engraving ceramic anilox roller has a line number of up to 1,000LPI. The use of a special ceramic layer or super hard ceramic layer can increase the service life of the ceramic anilox roller and reduce the cost of use.
The ceramic anilox roller processed by YAG laser engraving technology has smooth mesh hole wall and neat mesh wall, high finish, accurate ink transfer, and small scraper loss. Not only the ceramic anilox roller has a long service life, but also can extend the Service life. High-power, high-precision YAG laser engraving machine can engrave 16001pi anilox roller.
(3) Closed double scraper cavity ink delivery system
The two-roller, forward scraper and reverse scraper structures can achieve quantitative ink supply, but the ink is often directly exposed to the atmosphere in a large area, so that the solvent of the solvent ink is volatilized into the surrounding air, causing ink characteristics Changes and environmental pollution problems: If water-based ink is used, air bubbles will be generated, which will affect the printing quality.
The closed double-scraper cavity ink delivery system is composed of ceramic anilox roller, two scrapers, sealing strip, ink storage container, ink pump, ink delivery hose and other components. In a fully enclosed system, the scraper, seal, pad, and pressure plate are all mounted on a cavity type bracket, and they are mechanically (or pneumatically or hydraulically) pushed to the ceramic anilox roller, and a certain pressure is applied, and then Connect the ink delivery tube and the return tube to the ink pump and ink storage container respectively to achieve quantitative ink supply. The reverse scraper structure is adopted, which is suitable for high-speed operation, reducing the volatility of the solvent in the solvent ink and the problem of environmental pollution. The system can also be quickly docked with an automatic cleaning system to facilitate rapid cleaning to reduce ink replacement time and downtime.
(4) Environmentally friendly flexo ink
Today, people pay more and more attention to environmental protection, water-based ink and UV ink to meet market demand, and promote the application of flexographic printing in the field of packaging printing. It can be used not only for printing on various coated paper, offset paper and whiteboard paper, but also for printing on printing carriers such as gold and silver cardboard, synthetic paper, self-adhesive paper and corrugated paper box.
Water-based (or water-based) inks use water as the main solvent, non-toxic, non-polluting, and no residual odor, completely eliminating the harm of certain toxic substances in the solvent ink to the human body and the pollution of packaged goods, effectively reducing atmospheric pollution To improve the environmental quality and printing environment, especially suitable for packaging and printing with strict hygienic conditions such as pharmaceuticals, food, beverages, tea, tobacco and alcohol, and daily necessities in contact with the human body.
Under ultraviolet irradiation, the photoinitiator in the UV ink is excited to decompose into free radicals, and the free radicals cause the cross-linking reaction to occur quickly, causing the colloidal components to become solid instantly. Because UV inks are mainly composed of pigments, photosensitive resins, reactive diluents, photoinitiators and additives, they do not contain volatile organic solvents, which can greatly reduce VOC emissions, and consume less energy, the equipment covers a small area and is easy to dry. high productivity. Since the UV ink does not have the problem of water or solvent volatilization, the transfer and reduction of dots are good, and the colors are more vivid, which greatly promotes the improvement of the quality of flexo printing. Although the drying cost of UV inks is significantly higher than that of water-based inks, UV inks have good photocuring efficiency and ink layer properties, and can well protect the surface of printed products.
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3.3 Gravure printing technology
(1) Gravure electric carving technology and digital proofing
Traditional intaglios include engraved intaglio, etched intaglio and photogravure, in which engraved intaglio includes hand-engraved intaglio and electronic circle intaglio.
Modern electronic engraving intaglio has the advantages of advanced technology, low platemaking cost, high platemaking quality and stability, wide range of application, and environmental protection, etc. It occupies a dominant position in gravure platemaking.
Modern electronic engraving systems do not need to input information through the scanning unit. All image data, device driving parameters and other information are transmitted to the electronic engraving equipment in a digital form. The key technologies of the electronic engraving system include drive circuit technology, digital signal processor application technology, AC servo technology, and high-frequency electromagnet technology.
Intelligent and high-frequency engraving technology is the main development direction of gravure electronic engraving system. The intelligent engraving system includes automatic trial engraving, automatic rapid crossing of non-engraving areas, and automatic replacement of plate cylinders. The carving frequency is the bottleneck that affects the efficiency of the electric carving system. Therefore, the development of higher frequency electromagnetic engraving head 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 principle of the gravure printing machine, and the ink is transferred to the substrate through the roller pressure between the impression cylinder and the gravure cylinder to form a clear pattern. Digital proofing machine adopts inkjet and electronic imaging proofing methods. Using digital technology to obtain high-resolution mesh proofs directly on the heat transfer material can effectively reflect the subtle levels. Although the proof color of digital proofing is currently difficult to achieve the color reproduction effect that the gravure ink has the sense of transparency and density. However, digital proofing has the characteristics of high production efficiency, reliability and convenience, which is an important trend for future development.
(2) Improvement of gravure ink
As people's awareness of environmental protection increases, more attention has been paid to the environmental pollution problems caused by traditional solvent-based inks. With the technological advancement of a new generation of water-soluble polymers, water-based inks have been successfully used in the gravure printing process of cigarette packaging, wine labels and other paper packaging products, which has achieved toluene-free ink printing and avoided solvent-based inks for the environment and operators Pollution. Water-based ink has shown a huge impact and significant growth potential on the packaging market, which is the direction of development of the ink industry. Water-based varnish will also gradually replace solvent-based varnish.
In European and American countries, 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 with water-based inks has become an inevitable development trend.
Water-based gravure aluminum box ink is a volatile and dry thermosetting ink, which is mainly composed of film-forming substances, colorants, additives and solvents. The film-forming substance is a key part that determines the physical properties of the ink. Water-soluble acrylic resin and water-soluble self-crosslinking emulsion component colorant are often used as materials with alkali resistance. This water-based gravure ink is non-toxic, odorless, has good transfer performance and fastness, and is suitable for rotogravure printing.
(3) Advanced technology of gravure printing equipment
Most advanced gravure presses abroad use the sleeve-type impression cylinder and the direct drive technology of plate roll reduction. The sleeve-type impression cylinder has the advantage of quickly replacing the cylinder, and there is no need to break the material belt when replacing the impression cylinder, thus reducing material waste. The printing plate cylinder of each printing unit is directly driven by a separate motor, which realizes longitudinal registration during the imprinting process, and orders a stepper motor to move to control the horizontal registration. The main advantage of independent drive is that it does not require a mechanical transmission shaft and registration compensation roller mechanism, the number of mechanical parts is reduced, and the length of the tape is shortened, which is conducive to improving the printing quality and printing speed.
The rapid replacement, positioning and installation system can effectively reduce the auxiliary time of the device and improve the working efficiency. At present, foreign advanced gravure printing presses adopt pneumatic installation of squeegee blade fixing clips, printing tools, quick positioning and installation of carts, etc. to achieve rapid replacement of jobs.
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3.4 New technology of screen printing
Screen printing has the characteristics of thick ink layer, rich graphic layers, strong three-dimensional sense, and wide printing materials. Its application in high-end tobacco, alcohol and food packaging cartons has gradually increased.
The use of UV screen ink to print matte, refracted, ice, wrinkle and other effects on the cigarette case greatly stimulated consumers' desire to buy. However, due to the low printing speed of flat screen printing, slow curing speed of ink, difficult to control printing quality, and large consumption of printing materials, it cannot meet the needs of cigarette carton scale and mass production. Using high-speed rotary screen printing production line, fast printing speed, high productivity, stable print quality, low consumption, changed the traditional flat screen printing, manual paper, ink supply, suitable for high-speed automatic, large-scale mass production Fold the carton.
Web-fed rotary screen printing uses nickel metal round screen printing plates, a built-in doctor blade and an automatic ink supply system. The doctor blade transfers the printing ink from the round screen to the surface of the substrate supported by the impression cylinder. The entire printing process from paper feeding, ink supply, color registration, UV dry bath, etc. are all fully controlled by the computer. The round screen printing plate is made of 100% nickel non-woven fabric material. The mesh hole is hexagonal wire shaped by electroforming. The entire screen surface is flat and even to ensure the stability and precision of the imprint. Suitable for large-format rotary printing, the maximum speed can reach 125m / min, and the screen can be reused 15 times. Therefore, reel-to-roll screen printing can not only meet the requirements of special effects such as frosting, ice blossoms, etc., but also online hot stamping holographic anti-counterfeiting signs, embossing, die-cutting, and easy to realize high-speed automatic printing carton.
Environmentally friendly UV silk screen imitation metal etching ink is mainly composed of oligomer (ie photo-curable resin), reactive diluent (ie photosensitive cross-linking monomer), photo (polymerization) initiator and filler. Printing on gold and silver cardboard, UV screen printing metal imitation etching ink quickly cured under ultraviolet light, the surface of the printed matter produces a frosting effect.
Under the irradiation of external light, the photopolymerization initiator in the UV ink absorbs photons of a certain wavelength and excites to an excited state, forming free radicals or ions. Then, through the transfer of energy between molecules, polymers such as polymerizable prepolymers and photosensitive monomers are brought into an excited state, and a charge transfer complex is generated; the complex is continuously cross-linked to the stage and cured into a film. UV inks selectively absorb photons of ultraviolet light,
The drying of UV ink is affected by the total energy of the UV light source and the distribution of light energy at different wavelengths. Solving the matching of UV ink and UV light source is beneficial to accelerate the drying speed of ink, improve labor productivity and energy utilization, and reduce production costs.
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4. Surface finishing and forming technology
4.1 Waterborne coating and UV coating
The laminating process is simple and cheap, but because the paper after lamination is difficult to recycle and regenerate, it is non-degradable and easy to cause white pollution. Long-term use will also endanger the health of workers. Therefore, the traditional ready-to-coat laminating adhesive materials will be replaced by high-quality, environmentally friendly new adhesives. Glazing can not only enhance the surface brightness, protect printed graphics, but also does not affect the recycling of paper, which can save resources and protect the environment. Therefore, it is widely used in the surface processing of paper packaging printed products. Glazing coating mainly includes solvent glazing oil, water-based glazing oil, UV glazing oil, etc. Due to the poor efficacy of the solvent varnish, and not conducive to environmental protection, the scope of application is greatly limited.
The water-based glazing oil uses water as a solvent, non-toxic and odorless, eliminating the harm to the human body and the pollution to the environment. It has fast dry bath speed, stable performance, good wear resistance of the glazed surface, wide post-print processing adaptability and heat The characteristics of good sealing performance and safe and reliable use have attracted more and more attention from food, medicine and tobacco carton packaging and printing enterprises.
UV coating depends 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 when glazing, there is no volatilization of solvent during curing, and it will not cause pollution to the environment. Prints using UV varnish have high surface gloss, heat resistance, abrasion resistance, water resistance, and light resistance. However, due to the high price of UV varnish and the high performance requirements of the machine, they are currently only used on high-end paper boxes. Light.
4.2 Hot stamping technology
In the fierce market competition, in order to increase the added value of the product and more effectively carry out packaging anti-counterfeiting, more and more packaging cartons adopt hot stamping process.
Hot stamping includes ordinary hot stamping, cold hot stamping, bump hot stamping and holographic hot stamping. Common common hot stamping processes are flat flat hot stamping and round flat hot stamping, because round flat hot stamping is line contact. It has the characteristics of hot stamping base material factory, suitable for large area hot stamping, high hot stamping accuracy, etc., and is widely used.
Cold hot stamping does not require the use of heated metal plates, but transfers the metal foil using printing adhesives. The cold stamping process has a low cost, saves energy, and has high production efficiency. It is a promising new process.
Concavo-convex hot stamping (also known as three-dimensional hot stamping) is the use of modern engraving technology to make the upper and lower female and male molds. The hot stamping and pressing and bumping processes are completed at one time, which improves the production efficiency. The mold made by electric engraving can be curved surface transition to achieve a three-dimensional relief effect that is difficult to achieve by the mold made by the general corrosion method. The appearance of uneven hot stamping makes the hot stamping and embossing processes complete at the same time, reducing the process and waste products caused by inaccurate overprinting.
The holographic logo uses computer technology to change the amplitude and frequency of the grating to make its effect more brilliant and clearer than the calculated color of the pattern. If this kind of holographic mark is used as a copy of the original, a large amount of holographic loss will occur, thereby achieving the purpose of anti-counterfeiting. The holographic logo can not only have very good anti-counterfeiting performance, but also can make special numbers or words into the holographic logo according to the needs of customers. It is more and more widely used in high-end carton packaging.
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4.3 Die cutting technology
(1) Die-cutting plate and its processing technology
Die-cut plate material: In addition to the multi-layer wood plywood (MULTIPLEX) commonly used in China, fiber plastic plates (DURAMA) and sandwich steel plates (SANDWICH) are also popular abroad. The life of the die-cutting plate mainly depends on the quality of the phase cutter and the number of tool changes. The fiber plastic version and the sandwich steel version not only have high accuracy, but also overcome the shortcomings of the multi-layer wood plywood that is easily affected by humidity and temperature changes; and the number of tool changes is 3 times and 6 times that of the multi-layer wood plywood, respectively. In foreign countries, in addition to high-pressure water jet slotting for fiber plastic plates, multilayer wood veneer plates and sandwich steel plates are generally made by laser-cut square calligraphy.
Die-cutting plate laser cutting system Die-cutting plate laser cutting system is composed of laser processing head, computer-aided design (CAD) software, computer numerical control device (CNC), worktable, etc. The graphics are cut out by the relative movement of the worktable and the laser beam. When cutting, the procedures for staying, bridging and cutting the frame should be written according to the process requirements to determine the best path for the laser cutting of the die-cut version. The expert system can automatically select the best process parameters (power, speed, pressure, etc.) according to the type, performance, thickness and processing requirements of the plate. Using laser cutting die-cutting plate, not only fast and high precision. And the repeatability is good, especially when cutting the multi-plate and repeatedly making the die-cut plate, it is more superior.
In order to ensure the accuracy of the die-cutting version of the bamboo cutting die, the die-cutting tool forming system uses CAD software to automatically calculate the length of the die-cutting knife and the indentation knife and the size of the bridge gap, and sends it to the tool-forming machine for automatic grooving, cutting, bending Cut off.
(2) Bottom mold (backing) CAM system
When processing the backing with a computer-aided engraving instrument, the indentation groove width, cutting depth and accuracy should meet the requirements and the engraving speed and depth should be adjustable. The application of CAM technology can not only shorten the production cycle, but also improve the manufacturing accuracy of the carton.
(3) Box-type proofing and direct production technology
The multi-function carton sample CAM system is equipped with combined cutters and pressure cutters. When the control part receives the execution instruction, the execution part automatically selects the indentation and cutting cutters according to the type of cardboard, and the computer-aided design structure data and program Automatic drawing, indentation, cutting and automatic tool change.
The Boardeater folding carton laser processing system developed by the German MARBACH company uses a carbon dioxide laser beam, which can directly process the folding creasing line and trimming of the carton on the cardboard, with fast speed and high precision.
It can process paperboard with a grammage less than 1500g / mm and paperboard with corrugated thickness from B to 3 layers. When processing small batches of standard cartons, processing costs can be greatly reduced.
(4) Die cutting method
Single-sheet flat-bed die-cutting is mechanically positioned by the front and side gauges, while in-line flat-bed die-cutting is positioned by printing marks and there is no gripper row. In order to achieve continuous transfer of paper in the rotary printing unit The transition to the intermittent movement of the die-cutting station is usually provided with an adjustable eccentric mechanism in the paper feed.
The on-line round die-cutting die-cutting production line is a roll-press die-cutting, hot stamping linkage production line specially used to produce high-end cigarette packs. Its main feature is hot stamping, stamping and stamping of the printed roll cardboard A series of operations such as cutting and scrapping, so that the printed sheets are processed into the final product at one time. A series of quality problems such as surface smear caused by the old process in the past, inaccurate positioning of ordinary hot stamping and holographic hot stamping, and high scrap rate are avoided, and equipment investment and floor space are reduced, and a large number of operators are saved and shortened. 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 the roll paper round die cutting and hot stamping linkage production equipment has reached 180mm / min.
Because the round pressing and hot stamping and die cutting are line contacts, the line pressure during die cutting is much smaller than the flat contact pressure, so the equipment power is small and the stability is good; because it is continuous rolling die cutting, the production efficiency is high , The maximum die cutting speed can reach 350m / min. The round pressure garden die-cutting machine is equipped with high-precision registering device and die-cutting phase adjusting device, which can obtain quite high die-cutting precision.
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