1. What is laser engraving gravure
Laser engraving gravure uses a laser gravure engraving machine to engrave a gravure cylinder. The work process is as follows: first, the gravure copper cylinder is fully corroded and Traditional inking holes are formed on the surface, with a hole depth of about 50um, and the angle of the grid and overprinting marks are determined at the same time.
Next, an electrostatic spraying process is used to coat a specially formulated epoxy resin on the surface of the gravure cylinder, which is then heat treated (to solidify the resin) and honed. Thermoset epoxy resin has properties similar to those of a copper base and can be honed to a smooth surface.
The above is mainly to prepare for laser engraving. The prepared roller can be stored for a long time and used for engraving and plate making at any time. During engraving, a high-power carbon dioxide laser beam is used to sweep the surface of the drum to vaporize the epoxy resin on the surface.
Adjusting the focus of the laser beam can make the ink holes reach the required depth and size. Through multiple sweeps, the final carved ink holes are smooth and clear.
During the engraving process, the drum rotates on a bed at a speed of 1000r/min, and the laser beam traverses the drum surface at a speed of 75mm/min. The engraving speed is 100,000 ink holes/s.
After the drum is engraved, it can be used for proofing or other revision operations. The directly engraved roller is suitable for short-run printing. When printing long-run jobs, electroplating (nickel, copper or chromium plating) needs to be carried out in the traditional way to increase the strength of the layout and the printing durability of the printing plate.
For used rollers, the original surface plating can be peeled off, re-coated with epoxy resin, and used again, up to 10 times. 2. What is the use of laser (laser) engraving?
Our factory was established in 2003 and is located in 128 Industrial Zone, Tangxia Town, Dongguan.
It is a processing factory specializing in laser (laser) engraving, self-adhesive (stickers), and offset printing products. It has advanced laser marking, self-adhesive and offset printing equipment.
Undertake laser (laser) engraving and production of self-adhesive and printed products on various metals, plastics and other non-metallic materials. Business scope Laser (laser) marking: can process metal products, plastic products, leather products, wood products, acrylic products, etc. with any text or pattern: such as clocks, glasses, zippers, jump numbers, mold engraving, electronic components, buttons , handicrafts, sanitary ware, measuring tools, cutting tools, home appliances, mobile phone casings, various buttons, VCD (DVD, MP3) casings, instruments and meters, integrated circuits (ICs), electrical appliances, mobile communications, precision instruments, building materials, PVC pipes, Medical equipment, lighting and audio, trademark signs, tableware, 360-degree rotating laser (such as pens, fishing tackle, bearings and other cylinders), office supplies, household supplies and other industries.
Self-adhesive, offset printing: transparent self-adhesive, laser anti-counterfeiting self-adhesive, fragile paper self-adhesive, removable paper self-adhesive, PVC self-adhesive, PET gold and silver paper self-adhesive Glue, serial number stickers, kraft paper stickers, aluminum foil stickers, thermal paper stickers, computer printing roll stickers, copper paper stickers, writing paper stickers, four-color printing stickers Various high, medium and low-grade self-adhesives such as dry glue, crystal glue, metal labels, metal stickers, etc. Hang tags, color cards, instruction manuals, greeting cards, carbonless paper forms, factory hotel bills and other various bills, forms, delivery notes, receipts, etc. 3. What does laser engraving do?
Laser engraving processing is based on CNC technology and laser is the processing medium.
The physical deformation of instantaneous melting and vaporization of the processing material under the irradiation of laser engraving can enable laser engraving to achieve the purpose of processing. Laser engraving is the use of laser technology to write text on objects. The words carved by this technology have no marks, the surface of the object remains smooth, and the writing will not wear off.
Laser engraving processing is based on CNC technology and laser is the processing medium. The processing material is instantly melted and vaporized under laser irradiation and undergoes physical degeneration to achieve the purpose of processing.
Laser processing features: no contact with the material surface, not affected by mechanical movement, the surface will not deform, and generally does not need to be fixed. It is not affected by the elasticity and flexibility of the material and is convenient for soft materials.
High processing precision, fast speed, and wide range of applications.
4. Advantages of laser engraving
Advantages of laser engraving: 1. Wide range: Carbon dioxide laser can engrave and cut almost any non-metallic material.
And low price! 2. Safe and reliable: using non-contact processing, it will not cause mechanical extrusion or mechanical stress to the material. There are no "knife marks" and will not damage the surface of the workpiece; it will not deform the material; 3. Accurate and meticulous: the processing accuracy can reach 0.02mm; 4. Saving and environmental protection: the diameter of the beam and spot is small, generally less than 0.5mm; cutting and processing saves money Materials, safe and hygienic; 5. Consistent effect: Ensure that the processing effect of the same batch is completely consistent.
6. High speed and fast: high-speed engraving and cutting can be carried out immediately according to the pattern output by the computer. 7. Low cost: It is not limited by the processing quantity. For small batch processing services, laser processing is cheaper. 5. What is the history of screen carving?
Screens are made in various forms, including vertical screens, folding screens, etc.
Later, the interstitial screen appeared purely as a decoration. It was small, exquisite and interesting. In ancient times, princes and nobles were very particular about making screens, using materials such as mica, crystal, and colored glaze. In the inlay process, valuable items such as ivory, jade, enamel, jade, gold, and silver were used.
It can be described as extremely luxurious. However, most folk screen production advocates practicality and simplicity.
There are many people with plain screens, and this trend has become popular since the Wei and Jin Dynasties. Bai Juyi, a poet of the Tang Dynasty, once wrote in "The Ballad of Su Ping": "There are no seal scripts by Li Yangbing, handwriting by Zhang Xu, flowers and birds by Bian Luan, and turquoise by Zhang Zao. I will not add a little bit of painting on them. I want you to keep it true and keep it all white." ”
It shows his admiration for plain screen. Compared with the Huaping of the Emperor's House, the folk plain screen is really unique and has a leisurely charm. 6. Laser engraving has advantages
1. Comparison between laser engraving plate making and manual engraving plate making
Laser engraving plate making completely imitates and optimizes the manual plate making design. After laser engraving plate making is introduced to the market, In the past ten years, through software upgrades, engraving has a 0.3MM slope and automatic compensation for light attenuation at engraving corners. Improve automatic engraving speed. Basically hand-engraved platemaking is eliminated. In addition, laser engraving plate making completely eliminates engraving errors and the inevitable engraving errors caused by manual engraving. The original manuscript is good, but one mistake during manual engraving will cause the entire page to be scrapped. If not discovered in time, the entire batch of cartons will often be scrapped. Laser engraving uses software to input the original document for automatic engraving, and there are no engraving errors. It turns out that the more than 20,000 hand-engraving and plate-making employees in the Pearl River Delta have basically disappeared and have all changed careers.
2. Comparison between laser engraving plate making and resin plate
Laser engraving plate making has a low one-time investment. A set of equipment for a 2-meter photosensitive flexible drying machine is no less than 400,000 yuan, and a laser engraving machine is about 40,000 yuan.
The production cost of resin plates is high. In the Pearl River Delta region, the average price of resin plates is 1.25 yuan/in2, and laser engraving plates are 0.32 yuan/in2. Although mass production of resin plates can reduce the production cost to 0.90 yuan/in2 , however, not every company can do it. Even if it can be done, the cost is still much higher than laser plate making.
Laser engraving plate making has low energy consumption and no pollution. Resin plate processing is highly polluting. Although using a plate making fluid recovery device is better than not having one, the recovery rate of the plate making fluid cannot be 100%, and pollution is unavoidable.
The size of laser engraving can be infinite, and the production space only requires more than ten square meters. However, the working space of the resin plate printing machine cannot be less than 40 square meters. The smell during production is pungent, and the production space must be Separate independently. In addition, the processing size is limited by the machine model. The 2-meter photosensitive flexographic plate machine can only produce resin plates within 2 meters. 5. The laser engraving plate uses a 0.3MM slope, and its durability is basically close to the resin version. Only the resin version with characters below size seven is better than the laser engraving version in terms of printing clarity.
3. Practical application of laser engraving plates and photosensitive resin plates in the corrugated box packaging industry
At present, in the economically developed areas of the Pearl River Delta and the Yangtze River Delta, photosensitive resin plates and laser engraving plates Resin plate is very popular due to its high flexibility and clear printing mark. In the carton industry, transportation and packaging printing marks account for 30% of the market, while laser engraving plate making is fully accepted. The original hand engraving plate making accounted for 70% of the market.
90% of corrugated boxes are transportation packaging, and the printing mark requirements are generally around 40 lines, while the carton printing machinery can only reach below 80 lines, and color offset printing is generally used for more than 80 lines. For electrical appliance packaging between transportation packaging and sales packaging, laser engraving plates can be used. Due to the habits of some manufacturers' operators, resin plates are now mostly used.
4. Competition and prediction of low energy consumption, environmentally friendly and economical laser engraving plates and photosensitive resin plates
5. Diversified competition in plate making technology
Competition is not only It provides more choices for the carton packaging industry, greatly reduces costs, and improves economic benefits for the carton packaging industry. Before the advent of laser engraving plate making, the average price of photosensitive resin was 5 yuan/in2. At that time, almost every industrial zone in the Pearl River Delta had photosensitive resin plate production and processing points, and there was a strong trend of their spread. After laser engraving plate making was introduced to the market, the price of photosensitive resin plates dropped sharply, to 1.25 yuan/in2 today, and the production scale also shrunk. The benefits of platemaking competition to the carton packaging industry are obvious. To sum up, in the future, corrugated carton packaging companies will continue to compete in printing plate technology, and the competition between laser engraving plate making and photosensitive resin plates will continue, and it will be more exciting. According to predictions by experts in the corrugated packaging carton industry. In the future, photosensitive resin will be completely withdrawn from transportation and packaging carton printing plates. For product printing between transportation and sales packaging, photosensitive resin plates still have a slight advantage. About 60% use photosensitive resin plates and 40% use laser engraving plates. Originally, photosensitive resin plates were used. The resin version has undoubtedly become a thing of the past.
At present, laser engraving plate making in the corrugated carton packaging industry accounts for 75% of the market share, and it continues to expand. Although photosensitive resin has high stability and high-definition printing effects, The cost issue is the bottleneck restricting its development. Even if the cost can be reduced, environmental protection issues are the most critical issue restricting its development. Therefore, economical and environmentally friendly laser engraving plate making is the future development direction of printing plates in the carton packaging industry. 7. What is the principle of laser engraving?
It has always been considered technically unfeasible to directly engrave copper plates with lasers, but lasers can directly engrave zinc.
Swiss MDC company realizes direct laser engraving through the improvement of plate making process. A thin layer of nickel is first electroplated on the copper roller, then copper is plated on the surface, and then a layer of zinc is plated.
This layer of zinc can absorb laser energy and evaporate, along with the copper underneath it, creating a network of ink-carrying cells. After engraving, like other engraving rollers, the roller is finally plated with a layer of hard chrome.
A YAG laser with a power of about 500W has also been developed, which can engrave 70,000 cells per second. The direct laser engraving system mainly consists of three parts: high-energy laser, laser transmission system, and optical system. By adjusting the focal length, the energy per unit area is adjusted.
Laser engraving materials: non-metallic material processing (co2 laser): plexiglass, wood, leather, cloth, plastic, printing rubber plate, two-color plate, glass, synthetic crystal, horn, cardboard, density Slab, marble, jade, etc.; common metal materials for metal material processing (YAG laser).