Improve the print quality of the carton (below)

After the plate is ready, take a piece of 0.5 mm thick clear polypropylene plate, draw a vertical line at the center of its length, and then press the size of the carton to be drawn, draw a line of length, width, and height with a small stroke, and press the sample or sample box. Production notices stipulate imposition. After positioning the layout, use the pen to draw the line on the edge of the printing plate. After that, the same size plate base prepared in advance is overlaid on the base plate of the well-drawn line, and all edges are accurately traced (for example, three colors can be used to overprint a plate base). ), Finally, press the printing color, and the corresponding printing plate is firmly stuck in the painted position with neoprene. Then use the double-sided adhesive to attach the printing plate to the roller of the printing machine. The center line of the printing plate can be aligned with the centerline of the platen roller of the printing machine. As long as the position of the imposition is accurate and other objective conditions are satisfied, overprinting is accurate. 
Fifth, the effect of full version printing on carton strength
We know that during the carton printing, the corrugated cardboard is formed by the paper guide rollers and printing rollers of the printing machine and transferred to the grooved portion. After the paperboard is pressed by the roller during the transfer process, the physical properties of the paperboard are changed by different procedures. Affect the strength of the carton. Full-plate printing is particularly prominent. Compared with no-printing, the cardboard box of the same material has to be reduced in strength by about 30%. Therefore, it is necessary to pay great attention to the production process. The following measures can be taken to ease it:
First, properly adjust the gaps of the paper guide rollers of the printing press so that the paperboard passes smoothly without deformation (slightly smaller than the best paperboard thickness of 0.1 to 0.15mm). Second, the pressure of the printing plate can be adjusted to meet the printing requirements. There is no depression in the surface of the box and it can be leveled. Thirdly, the speed of the printing press should be increased (1000 rpm/miN or more), so that the board can pass through the printer as soon as possible to reduce the pressure on the board.
Sixth, carton leakage version of timely printing in the actual production of the printing machine without a computer calibration device, due to the operator's careless word missing version of the phenomenon is difficult to avoid. After similar things happen, remedial measures should be taken promptly. If only the notch is cut, the slotted knife can be unloaded, and the missing layout can be subsidized to the corresponding position. Then the other steamed plates can be unwound and can be reprinted, but avoid the speed too fast. Ineffective or layout moves. If the printed carton has been nailed, in addition to dealing with the layout in accordance with the above method, but also adjust the gap between the guide roller to the shape of the carton after the smooth deformation is not appropriate, the printing roller pressure must be adjusted, and then transfer the paper Baffle, determine layout position, single delivery when printing. 
Seven, thin cardboard printing notes 
The so-called thin cardboard, that is, D, E fine corrugated cardboard, these thin cardboard after the printing of the application of flat pressure die-cutting machine stamping, due to small quantities or customers only once, coupled with the high cost of die-cutting knife, so when the production Use print slotting instead. In actual operation, because the paperboard is too thin, the printing speed must be slowed down, but the paper feeding device is not difficult to push paper, that is to push multiple paperboards at the same time into the printing press, resulting in a lot of waste. To solve this problem, you can use a single machine to slot, then print after binding and forming, but according to the two sides of the carton, different loading plates must be printed twice to complete a complete layout of the carton. 
Eight, warpage cardboard to prevent the run version, slotted to take place on the warpage of the cardboard printing to take a single sheet, low-speed operation, while the appropriate increase in the amount of suction, depending on the layout, slotting in time and move the printing plate slotting phase Forward and reverse correction. Warp severely selected cardboard, every 3 to 5 positive and negative stacking with the weight of flattening reprint next time, or folded along the indentation line to the opposite direction of warping folded again. 
In short, in actual production, under specific circumstances, we must also be flexible in dealing with objective conditions. The above is for reference only, because the author's level is certainly limited, and is willing to discuss with peers.