Gravure preprinted corrugated box production process

Gravure preprinting is a new type of carton printing production method in China. Under the prevailing situation in the industry, our paper intaglio pre-production enterprises are willing to choose navigation for your purchase. Here we talk about the gravure preprinted corrugated box production process and gravure preprinting equipment and gravure preprinted corrugated carton production broad market prospects.

Gravure preprinted corrugated box production process

The so-called gravure pre-printed corrugated box production refers to the use of a large-sized group gravure printing machine to carry out the carton pattern printing on the web. After the printing is completed, it is still rolled into a roll shape. The printed web is then used as a carton. The corrugated paper production line is made of corrugated cardboard boxes, which are then cut into carton shapes by a die-cutting machine. Here we use the paper concave preprinting machine produced by Qinhua Company as an example to explain the advantages of preprinted corrugated box production.

First, the speed of the gravure preprinting machine is usually much higher than other printing methods (basically domestic equipment is 120 ~ 200m/min, can match with many domestic corrugated paper production lines, and then the printed web directly on the corrugated paper The production line is combined with corrugated paper, which not only shortens the production process of traditional production of carton board, but also reduces the labor cost and raw material consumption, and improves the production efficiency.

Second, the paper concave preprinting machine longitudinal and horizontal overprint accuracy is less than ± 0.2mm, the number of printing network lines up to 300 lines, the maximum amount of ink is 6.5g/m2 After printing each color group unit has a drying device, fully drying, so it is easy Get a full, soft, vibrant, firm carton surface.

3. The version of the roller used in the paper concave preprinting machine is a steel chrome-plated electric engraving plate, which can bear printing times of up to 4 million prints. It can reduce the number of plate changes, save raw materials, and is suitable for producing large quantities of long-lived products, and It can ensure that the pattern and color of the printed product are of the same height.

4. The corrugated box produced by gravure preprinting is completed in the production line of corrugating machine, so there is a certain heating and forming time when manufacturing corrugated board. The final production of corrugated box is not only high in strength, but also strong and smooth, and it can avoid veneer machine at the same time. During production, the unevenness of the glue causes the cardboard box to sag and warp.

5. The inks used for gravure preprinting are mainly alcohol-soluble inks or water-based paper inks. Pre-printed roll paper carton paper must be glued, compounded, flattened, and dried during the upper corrugated paper production line. Therefore, the ink used is more stringent; otherwise, the pattern and pattern on the carton paper will be pulled. Or drag ink. In view of these, Qinhua Company negotiated with the ink manufacturer to develop and produce special ink for pre-printing, which is basically the same as ordinary ink.

Paper concave preprinting equipment

The paper concave preprinter is generally divided into five large stations such as a discharge section, a paper pretreatment system, a printing section, a drying section, and a receiving section. In terms of its matching with corrugated paper production lines, the types of preprinting machines can be divided into: Model 1300, Model 1650, Model 1800, Model 2000, Model 2200 and Model 2500. The number of printing colors is 5 to 8 colors (adding or subtracting and applying processes). At present, the speed of domestic gravure preprinting equipment ranges from 120 to 200 m/min, and the printed paper generally uses 120 to 350 g/m2 reel coated coated paper, coated white paper and coated cattle cardboard, and the overprinting accuracy is ±0.2. Mm. The QHZH-61650 paper gravure preprinting machine produced by Xi'an Qinhua Co., Ltd. is used here as an example to talk about the installation and working conditions of each workstation of the gravure preprinting machine.

The first is a complete roll change system. We all know that the complete unwinding and unwinding system for prepress equipment is an important part of improving work efficiency and saving raw materials. The reeling system of the 61650 preprinting machine produced by Qinhua Company is a high-speed fully automatic joint-type reel changer. The complete work of the entire equipment unwinding system includes the reel-up machine support and automatic non-shaft clamping, automatic reversal positioning, and roll-up. Diameter detection pre-speed synchronous drive, tape position detection and indenter cutting, floating roller positioning system and traction and so on. It is characterized by the ground lifter loading and unloading the paper roll, the retractable winding shaftless hydraulic centering clamping, the flip pre-driver and the joint cutting are all automatically completed according to the setting procedure. The waste produced by the docking joint system is negligibly small, and smooth butt joints have little impact on the printing process. In the state where the high-speed printing does not decrease the speed, the joint unloading roll only produces very few scraps. The floating roller detection closed-loop control system can stabilize, balance and compensate for the tension fluctuation and impact generated by rewinding and rewinding. Retracting coil traction prevents and disconnects tension fluctuations in the entire refueling joint without affecting printing. The traction drive for retracting and unwinding adopts a digital vector control system, complete closed-loop control through PLC and man-machine interface, making the unwinding work under constant tension state, and winding up to make taper tension work operation.

The pre-printing system for gravure pre-printing is a process usually set up by a paper concave preprinting machine. It generally includes three purposes: First, to control the printed paper moisture (water content of 5% to 7%), so that the paper in the subsequent printing process, the paper web is unchanged or slightly changed, so as to achieve accurate printing and overprinting the goal of. The second is to remove paper dust and foreign matter, so that the paper surface is clean, so that it will not appear in the subsequent printing process and block the plate printing phenomenon. The third is to improve the affinity of the paper surface with the ink in the printing state, so that the paper is full and firm in ink during printing.

When paper pre-printing machine is used to pre-treat paper, the control of paper moisture is usually by hot-air-type hood heating or heating cylinder heating control on both sides of the paper. The former has high process efficiency, but has a slight impact on the micro gloss of the paper surface. The latter has low process efficiency, but it can maintain the microscopic gloss of the paper surface better. Paper dust removal process usually uses soft brush dust or vacuum suction method. For paper, the parameters of different parameters, such as different thicknesses, grammage or the same grammage or thickness of papers with different textures, and the same products with different products, are different in the pretreatment process. Depending on the circumstances.

Concave preprinted printing department: It is the core station of the entire equipment. The printing section usually includes an embossing roller system, a transmission box system, a plate support adjustment system, an ink supply system, a doctor blade system, and a register offset compensation system. Taking Qinhua QHZH-61650 paper preprinting machine as an example, its embossing roller system consists of an imprinting rubber roller, a back-pressure steel roller, a linear sliding guide rail and a returning self-locking pneumatic system, which can ensure ink well Good transfer of printing state, stable and balanced pressure on the printing pressure line, flexible and accurate printing of the printing roller, and self-locking of the embossing roller when the machine stops. Concave preprinting machine gearbox and printing support adjustment system: a shaft support plate drive system, shaftless platen support drive system and roller out of the car support plate system. No matter what kind of support transmission shape has the initial version of the unified version and the initial pre-version function. The transmission box has high precision, low noise and long service life. The ink supply system adopts a semi-closed ink-jet supply mode. When the printing roller receives ink, it has a certain pressure. When high-speed printing is performed, sufficient ink can be obtained for each dot on the screen, thereby achieving the effect of full color printing. The scraper system adopts two types of fixed and mobile constructions. The scraper blades are made of high-quality, high-elasticity steel and combined. Squeegee pressure using adjustable pneumatic floating pressure device. The squeegee can be adjusted and adjusted in three dimensions along with the speed of the host's working vehicle, and the adjustment range is large; it can be adjusted into a corner scraping ink, and can also be adjusted into an elevation squeegee. Computer overprinting, compensation system can memorize and repeat the parameters of the previous work, can reduce the reprint of waste generated by the initial overprint of the same product.

The drying section of the paper preprinter consists of a hot air drying system, an exhaust gas system, and a cooling system. Among them, the generation of hot air has three types: the conversion of hot air with electric energy, the conversion of hot air with steam, and the conversion of hot air with hot oil, and each has its own advantages and disadvantages. Users can choose according to specific conditions. The hot air hoods designed by Qinhua Company include: shape-sealing type, suction exhaust negative pressure type, hot air nozzle type, return air orifice type, working pneumatic opening and closing type, energy-saving secondary air return type, paper surface hot wind vortex movement type and large air volume low temperature Dry type, etc., its structure is designed according to the aerodynamic characteristics, and the performance has reached the requirements of the international high-end equipment drying system. The user can choose according to the type of ink used during production, the set mechanical speed, the type of paper used, etc. The cooling system is mainly to ensure that printing paper does not return moisture and control the printing paper containing the amount of water contained in the winding, to avoid the printing products and printing products stick together. The cooling system is generally double-set cooling, ie the air cooling section and the water cooling roller effectively cool the printing material.
Concave preprinting machine winding department: Qinhua company uses an independent electric double-armed rotary table structure, automatic rotation and positioning control; tension using closed-loop automatic tension control system; double retractable reel adopts no air cone top method; It can be changed at high speed without stopping the machine. The new material shaft is automatically pre-driven. Synchronous pre-drive is controlled synchronously with vector variable frequency motor; the new material shaft can also be manually adjusted laterally. In addition, during the winding process, the printed products can be automatically counted, and the set data can be automatically alarmed to remind the roll change; then the hydraulic lift is used to remove the finished product roll. Finally, the slewing transfer is automatically positioned and the taper tension is set (the taper tension is set on the human-machine interface screen). Qinhua production of gravure preprinting machine in the receiving part of the biggest feature is: with a cross-cutting cross-cutting mechanism, the printed product can be printed directly without cutting directly into a piece of sheet material.

Gravure preprinting produces vast market prospects for corrugated cartons

According to industry statistics: 31.2% of the corrugated boxes in Europe and the United States and other developed countries are using gravure preprinting technology. Today abroad is the development of our country tomorrow. In recent years, with the activeness of China's commodity market, the end customer groups of corrugated box manufacturers such as beverages, food, beer, and dairy products have turned their packaging purchases to the new technology of gravure pre-printed corrugated boxes. Among them, after the Guangjin Dong Jinsheng Group Gaofeng Carton Factory purchased Qinhua Company's paper concave preprinting machine, the quality of the company's products, work efficiency, and the economic benefits of the company have doubled. It is believed that with the prosperity of China's commodity market, and the development of pre-printing technology and equipment that will be perfect, the development of our country's printing and packaging industry will surely thrive and take the lead in the world. (Text / Zhang Feng)