Regardless of whether imported printing equipment or domestic printing equipment is used, unstable paper performance before printing is a big problem that many printing houses feel headache, especially gold and silver composite paperboard or transfer gold, silver and laser paperboard. The main problems are: due to changes in temperature and humidity, they have been deformed and deformed before printing, and there are ruffles; the surface coating varnish does not match the printing ink resin system, resulting in mutual dissolution; serious surface scratches, etc. These problems bring different degrees of difficulty to printing.
In order to avoid the above-mentioned problems, Shenzhen Jinjia Color Printing Co., Ltd. has researched and developed a production process integrating transfer, compounding, and nine-color UV gravure printing. This scientific research achievement enjoys the patent right of world intaglio printing technology.
Not long ago, a rotary gravure production line using the research results has settled in Shenzhen Jinjia Color Printing Co., Ltd., and has completed the installation and commissioning work. The machine is manufactured by Cerutti of Italy. This is the first domestic and the world's first rotary gravure production line integrating transfer, compounding, and nine-color UV gravure printing. It is named Jinjia Color Printing-960cerutti3288 (hereinafter referred to as Jinjia 3288).
1. Equipment performance
The printing width of Jinjia 3288 gravure production line is 400 ～ 820mm, from 80g / m2 single-sided coated paper to 350g / m2 cardboard, and the printing speed can reach 300m / min. From white card paper unwinding, transfer and composite film unwinding, glue bonding, oven drying, peeling, cooling, OPP and PET film winding, surface varnishing, to in-line printing (front and back laser positioning printing), UV sanding, UV Oil and cut large sheets can be completed at once. The glue application and 9 printing units are driven independently.
The machine can complete the following processes:
(1) Complete transfer, peeling, printing (front and back printing, front laser positioning printing), UV sanding, UV oiling, and cutting large sheets at a time.
(2) Complete local transfer (equivalent to cold stamping or holographic anti-counterfeiting positioning hot stamping), peeling, printing (front and back printing, front laser positioning printing), UV printing sand, over UV oil, and cutting large sheets.
(3) Complete compounding, printing (front and back printing), UV printing sand, UV oil, and cut large sheets at one time.
(4) Single-sided coated paper, white cardboard or gold-silver cardboard printing (front and back printing), UV sanding, UV oil printing, and cutting large sheets at a time.
(5) Printing, milking, and cutting large sheets of milk carton are completed at once.
(6) Local transfer of milk carton (equivalent to cold stamping or holographic anti-counterfeiting hot stamping), printing, oiling, and cutting large sheets are completed at one time.
(7) The paper guide roller is made of special metal, and the surface is specially treated to print plastic packaging.
(8) Provide transfer paper and composite paper processing for sheet printing (offset printing, gravure printing, etc.).
Second, superiority
Solving the stability problem of printing paper is the biggest advantage of Jinjia 3288 gravure production line. Before the line is printed at a printing speed of 150m / min, the paper is first compounded with BOPP and PET films, and then dried by 6 groups of ovens, and stretched with appropriate tension. When it reaches the printing unit, the paper has Invisible and variable. The use of this production line also solves a major problem in the prepress processing process, and there is no need to purchase metal paper from the packaging and paper industry compound factory, which saves some cumbersome procedures, effectively saves time, and reduces production costs.
Three, wet transfer, compound glue method
Jinjia 3288 can be transferred in two ways:
1. Three rolls of glue
Three-roll glue application is used for full-plate transfer and composite products. The amount of dry glue is controlled at 4 ～ 6g / m2. The coating quality is relatively stable, the coating is uniform, and the adhesion is firm. At the same time, the pressure of the glue roller and the amount of glue can be adjusted according to the scale. The greater the pressure, the glue The smaller the amount. The uniform amount of glue can ensure that the transferred product will not have watermarks caused by too much glue, too weak adhesion and incomplete peeling caused by too thin glue layer.
2. Glue anilox roller
Anilox roll glue is mainly used for local transfer (equivalent to hot stamping process or holographic anti-counterfeiting positioning hot stamping), and can also be used for full-plate transfer and composite products.
Anilox rollers are usually coated with ceramic anilox rollers, which are more expensive. Using engraved gravure as glue roller, low price, good performance after trial, and easy operation. Relevant parameters of engraving gravure for glue roller.
Using engraved gravure coating, the coating is uniform, the pressure is easy to control, the bonding is firm, the drying effect is good, the product performance is stable, and it is easy to peel.
Four, dry transfer, compound method
Dry transfer and compounding sound relatively unfamiliar. This is indeed a new technology and new process in China. But for Jinjia 3288 gravure printing machine that integrates advanced and innovative technology, it is not difficult.
For dry transfer and compounding, the superiority of the equipment must be provided, and then special adhesives should be used together. Various indicators of adhesives.
For dry transfer and lamination, an anilox roller or engraved gravure must be used to apply the glue, and the coating amount should be relatively uniform. When the back of the film is glued, it is not in a hurry to adhere to the paper, but first passes through the oven and is dried at an appropriate temperature; while the paper passes over the oven, the film and the paper run simultaneously. The film is not completely dry when it exits the oven, and then it is instantly heated by a hot oil roller at 120 ° C, and passed through the pressure roller in time, it can be firmly combined with the paper. After cooling or peeling or varnishing, you can enter the printing unit for gravure printing.
Dry transfer and compounding are generally used for printing high-end products. Because it is completed at one time, the paper is not easily deformed, and the multi-color overprinting accuracy is extremely high. In addition, due to fewer processes, time can also be saved.
5. How to control the printing surface within the laser transfer film surface
1. Laser film production process principle
The manufacturing process of the laser film is relatively complicated, and it adopts the vacuum aluminum plating method. That is, the evaporation boat is heated to 1400-1500 ° C to convert the aluminum wire continuously sent to the evaporation boat into aluminum vapor. Because the base film has an electrostatic adsorption force, aluminum molecules are adsorbed on the film surface. After cooling and depositing, the aluminum is evenly sprayed on the surface of the continuously wound film to form an aluminum plating film. Then, the laser engraved laser plate is wrapped on the roller, and the aluminum film is molded at a temperature of 130 ° C to form a laser film. The laser plate is wrapped on the roller and cannot be completely seamlessly combined, so every other plate distance, a 0.5 to 2 mm plate gap is left on the laser film.
2. The laser film transfer printing function of Jinjia 3288
Autoron1600 system high-power scanning tracker can identify and track small or weak cursors at a speed of 500m / min. During the transfer printing process, due to the tension stretching, the laser film will change with the change of the tension before it is bonded to the paper. When the laser film enters the printing unit, the high-power scanning tracker of the first color group can directly identify the plate seam of the laser film, and at the same time give several different overprint error signals that need to be adjusted. The printing unit is driven by an independent drive motor for automatic adjustment, and can track the overprinting method to firmly control the printing surface within the plate distance of the laser film, leaving the plate gap to the trailing edge and the mouth.
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