Introduction to carton preprinting technology
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The main equipment for pre-printing production is a large-unit reel stamping gravure press. Carton preprinted paper gravure presses have the following characteristics:
1. High printing speed and high precision of overprinting
The paper preprinted gravure press has a printing speed of up to 150 m/min and an overprinting accuracy of less than 0.2 mm.
2, the printing format is large
The paper preprinted gravure printing press can print from 1000 x 600 to 1700 x 1700 mm.
3, printing, oiling once completed
The paper pre-printing gravure printing machine can realize 4-12 ink printing and varnishing at one time. In order to reduce the cost of plate making, the oiling unit is driven by a separate motor, and it is not necessary to replace the oil-coated roller when replacing the printing plate roller.
4, can use environmentally friendly ink printing
The paper pre-printing gravure printing machine is equipped with a double oven hot air drying system, which can fully dry and solidify the ink to ensure that the printing surface enters the corrugated paper production line and the hot plate does not fade or "paint". The ink automatic circulation system and the agitating ink bar can make the batch print ink color uniform without chromatic aberration.
5, high-speed automatic non-stop refueling
The paper pre-printing gravure printing machine can realize high-speed non-stop automatic re-feeding of rolls, which can greatly improve the yield and save the auxiliary working time.
6, automated control
The paper gravure printing machine adopts 8 motor vector frequency conversion full closed loop tension control system, computer automatic color registration system, computer still image observation system, computer ink automatic circulation viscosity control system, computer automatic refueling control system, man-machine dialogue system and steam. force. Thermal temperature automatic control system. At the same time, the pneumatic shaftless plate, pneumatic scraper, pneumatic embossing, pneumatic shaftless clamp, two-cycle hot air drying, paper preheating, water cooling and other structures are adopted, which makes the operation of the machine very simple.
Pre-printed production aids are cross-cutting and longitudinal of the paper production line.
In the previous corrugated paper production line, most of the computer cross-cutting was only fixed length and cross-cutting, and the pre-printing production was to print the pattern first, so it must be added on the cross-cutting knife. The main control mechanism is to identify the cross-cut mark on the printed pattern of the corrugated board by the photoelectric eye, and transmit the time when the undercut mark reaches the photoelectric eye to the control computer, and then control the cross-cutting knife by the control computer. The cutting moment, thus achieving accurate cutting of the corrugated cardboard at the boundary of the pattern. At present, the current domestic and international cross-cutting machine manufacturers can easily add this function. The crosscutting accuracy can be controlled within 1mm.
Computer slitting and computer crosscutting are the same principle.
In order to prevent the printed surface from rubbing the printed surface on the hot plate of the corrugated paper production line, some simple treatment of the hot electrode is required.
The ink used for pre-printing gravure printing is water-based paper gravure ink, which is about 30 yuan per kilogram. The cost of ink is similar to that of offset printing. The ink meets the national environmental protection requirements.
The pre-printed plates are made of steel aluminized electro-engraving intaglio, but the paper-printed intaglio is deeper than the general plastic printing intaglio when engraving. The plate-making costs are: advanced level version 0.7 yuan / cm2, general level version and line version 0.35 yuan / cm2.
The pre-printing method for producing cartons is still in the ascendant in China. If the machinery manufacturers, ink, paper, printing plate suppliers, and the majority of carton manufacturers work together to promote, China's high-end carton production will bring a new option, improve the packaging carton grade in China to a The new level.