Application of gearless flexographic printing press on packaging
We are a big printing company in Shenzhen China . We offer all book publications, hardcover book printing, papercover book printing, hardcover notebook, sprial book printing, saddle stiching book printing, booklet printing,packaging box, calendars, all kinds of PVC, product brochures, notes, Children's book, stickers, all kinds of special paper color printing products, game cardand so on.
For more information please visit
http://www.joyful-printing.com. ENG only
http://www.joyful-printing.net
http://www.joyful-printing.org
email: info@joyful-printing.net
With the wider application range of domestic flexographic printing technology, the technology is becoming more and more mature, and the related equipments and accessories of flexo printing have also formed a series. The flexo printing is moving from the traditional ordinary label products to the high-end packaging printing market. At present, some cigarette package printing and folding carton printing enterprises in China are also concerned about the application of flexo printing in packaging and printing. They hope to use new equipment, develop new processes and new products, and keep up with the development trend of international packaging printing.
Varyflex 670's maximum printing format is 670X880, which basically meets the requirements of medium-width packaging. The machine has abandoned the traditional long-axis transmission. The whole machine adopts gearless transmission, that is, the plate cylinder and the impression cylinder are driven by independent motors to avoid Due to some limitations of gearing, thick cardboard and film can be printed on the same equipment without the need to replace any components.
For thick cardboard printing, Varyflex670 uses a non-stop unwinding with a unwinding diameter of 1500mm in the unwinding section. With a printing speed of up to 200m/min, the line die-cut produces nearly 15,000 finished cartons per hour. Production efficiency is no less than a gravure press. For the drying of 30u heat shrinkable film printing, with the cooperation of OMET R&D department, Varyflex670 uses 24 inch large water-cooled roller for each printing unit. The printing material is wrapped on water-cooled roller with circulating cold water, hot air and UV drying device. The material is dried on the water-cooling roller, which does not cause the pumping deformation caused by the heating, and avoids affecting the registration between the color groups. When the ink is dried in the large field, increasing the hot air power does not change the internal structure of the material, and also avoids accidents such as fire.
In terms of tension control, the Varyflex 670 can adapt to a wider range of printing. The operator can call different tension control curves to match different materials before starting the machine. The tension value will be automatically adjusted to the preset range before the machine is started. The three-stage four-stage tension control method is adopted, and the high-sensitivity multi-tension floating roller is used, and the tensions of the unwinding, printing, die-cutting, and winding sections can be separately controlled without affecting each other. The platen roller, driven by an independent motor, reacts very sensitively to tension and can be rotated in both forward and reverse directions. The unique tension control system provides a good prerequisite for registration.
Varyflex 670's registration system is unique because it uses a gearless transmission method. The register electrical part of each color group is integrated into the drive motor. The scan head can directly feed the registration signal to the plate cylinder book, and the traditional servo motor register. Compared with the method, this design not only greatly improves the registration accuracy, but also the registration is very fast. The customer even did the printing of 10 colors with the 8-color device (first roll to the mark 8 colors, then print the 2 colors plus the light) without changing the overprint accuracy. The effect of offset printing is basically achieved, and the waste of materials is further reduced.
In order to perfect the current high light and dark level, Varyflex670 first pays attention to the stability of the machine under high tension and high speed operation. The whole wall panel is made of nickel steel plate with a thickness of 3cm, and the wall of the die cutting area is thickened to 5cm. It avoids the loss of dark paste or small dot caused by machine vibration. It adopts double bearing structure on the plate cylinder. During the high speed operation of the machine, the ball bearing helps prevent the plate roller from axially moving, and the flat roller needle The bearing helps to prevent radial runout.
In the die-cut unit, the Varyflex 670 uses a dual magnetic roller technology. The use of the knives and knives of the yin and yang pairs overcomes the shortcomings of the former magnetic knives which can only die-cut thin paper, prolongs the service life of the die-cutting knives, and reduces the use time of the die-cutting knives, and the processing delivery time is also from two. Three months shortened to one week. When the thick cardboard is printed, the waste scraps are first shredded in the die-cutting unit, and then sent to the waste paper library by a conveyor belt. When the die-cut thick paper jam is used, the machine printing processing speed is not as low as 170 m/min.
Considering the extensibility of the machine, Varyflex 670 can extract the various ink supply systems along the guide rails, install the roller screen printing unit and the rotary gravure unit at the corresponding positions, and flexibly exchange the stations to develop some Unique printing process. Cold, hot stamping, wire bonding and other processes can also be easily installed in any position. On the flexo printing platform, a combination of multiple printing processes is truly realized.
In the operation interface, Varyflex670 minimizes the operator's influence on production. It uses the European patented semi-cam pressure control technology to adjust the printing pressure and ink supply pressure without affecting each other. It does not depend on the operator's experience; The labor intensity of the operator is reduced, and the cost of replacing the sleeves of different sizes is further reduced. 360 degree automatic pre-sleeve technology, each printing unit can automatically find the initial position of the printing plate before starting the machine, so that the initial registration can be completed. Only one paper path length can be fully registered after starting the machine, and the machine will be inaccurate and debugged. The resulting waste is reduced and the yield is improved. The use of gearless transmission also overcomes the limitation of the gear pitch, enabling the infinite change of the printing repeat length, and making more flexible layouts for different sizes of products during plate making.
With new equipment, new processes and products are developed based on: higher print quality, wider print range, easier machine operation and less material waste.