To ensure that each batch of orders can be completed in quality and quantity, in addition to paying attention to safety issues, we must also pay attention to the control of the production process. Among them, the production process needs to control the following aspects.
Paper Feed Unit Control During the production process, the warped cardboard is often encountered. At this time, it should be selected in a timely manner to put aside, until the formation of flat cardboard production, reduce the speed, and then slowly opened in the past. If it is too crooked, it can be stacked in groups of five, one in a positive and one inverted, and a heavy object is pressed on it. If there is still a next one, it can be left for the next production after being flattened. In addition, the height of the stacking board is preferably not higher than that of the two ends of the baffle plate. An excessively high stacking height will result in unstable feeding and affect the feeding accuracy. As shown in Figure 1.
Figure 1 The ideal stack height The height of the printing pressure control Each pressure is shown in Figure 2.
Figure 2 Contact pressure of various pressure corrugated board and printing plate (commonly known as printing pressure)
Due to the particularity of the corrugated board structure, the printing pressure cannot be too large during adjustment. Because excessive pressure will cause the compressive strength of the corrugated board to be reduced, it is appropriate that the board can gently contact the printing plate. In the actual production operations, some changes (such as stencil, plugging, dewing, etc.) may occur due to factors such as the speed of the machine, the warping of the corrugated board, and changes in the characteristics of the ink and ink. Therefore, in the production process, it is necessary to spot-check, control the pressure and ensure the printing quality.
Contact pressure between plate and anilox roller (commonly known as ink pressure)
In corrugated carton flexo printing, the control of ink pressure is an important factor in printing. In general, the size of the inking pressure control can be observed from the appearance of printed prints. If the edge of the print image has overflowed ink or if there is a phenomenon of heavy edges, it means that the pressure of the ink at this time is too large and can be adjusted to a smaller value. If there is a phenomenon of missing printed artwork, it means that the ink pressure is a little lower. At this time, it is necessary to adjust the ink pressure appropriately. Excessive inking pressure and proper inking pressure effects are shown in Figure 3.
Too much pressure on the right Inking pressure
image 3
When the contact pressure of the rubber roller (or scraper) and the anilox roller is used for inking the printing unit, the nip roller (or scraper) must first be adjusted to the gap pressure with the anilox roller. The ink pressure adjustment of the general rubber roller and the anilox roller is -2.5 to -3.0mm. Squeegee and anilox roller pressure gap adjustment, the general new blade is 0.3PSi, the old blade can be adjusted to 0.5PSi (machine control panel scraper barometer data display). Since the rubber roller or blade wears as the time for the machine to run increases, this data is not absolute. Therefore, both pressures should be adjusted in time according to the actual situation. In addition, after the end of production, the pressure of the rubber roller (or scraper) must be completely released after the equipment is cleaned, so as to avoid long-term extrusion and deformation between the two after the shutdown, which affects the uniformity of ink transfer in the future.
With the pressure of the paper roller This type of machine in the production process, the transmission of corrugated paperboard mainly by the respective unit with the paper roller to transfer, so the pressure of the paper pressure roller directly related to the paper, printing, slotting, die Is it accurate to cut the position? Adjusting the gap of the paper roller should be a gradual process, that is to say the following unit with the paper pressure roller should be slightly heavier than the front unit with the paper pressure gap pressure, the gap pressure is generally lower than the actual thickness of the corrugated paperboard 1~2mm.
In order to control ink and water, ink ink control must first understand the characteristics of ink. The main features of inks consist of two major aspects: viscosity and pH.
Viscosity control In general, the field version ink viscosity printed on cattle card paper is in the range of 22 to 25 seconds, the ink viscosity of dots and small graphic texts is in 14 to 18 seconds, and the field version of printing ink on coated paper is in the viscosity of 18 to 21 seconds. The ink viscosity of dots and small images is 12 to 15 seconds (measured in a #3 viscosity cup). When producing large quantities of orders, it is best to pay attention to the ink viscosity every half hour to ensure the printing quality.
pH control The pH of aqueous inks is controlled primarily by ammonia compounds, commonly known as ammonia stabilizers. Due to the volatile nature of ammonia during the printing process, which causes pH changes, the pH of the aqueous ink is generally between 8.2 and 9.5, and its printability is best. When the pH value is higher than 9.5, the alkalinity is too strong, the viscosity of the aqueous ink decreases, the drying speed becomes slower, and the water resistance becomes worse; when the pH is lower than 8.2, the alkalinity is too weak, the viscosity of the aqueous ink increases, and the drying proceeds. As the speed becomes faster, the ink and ink can easily dry in the cells of the printing plate and the anilox roller, resulting in a decrease in the ink storage volume of the anilox roller and easily causing problems such as a dirty plate.
In addition to controlling the characteristics of the above two major inks, it is necessary to observe the printing color in the mass production process to avoid overly obvious color difference. In order to control the color difference, we must pay attention to some details. The ink on the machine is better not to be on the whole barrel, and the amount of ink on the machine can be controlled at about 15kg each time. In the production process, it is advisable to observe diligently, diligently add ink, and less ink.
Paper Feed Unit Control During the production process, the warped cardboard is often encountered. At this time, it should be selected in a timely manner to put aside, until the formation of flat cardboard production, reduce the speed, and then slowly opened in the past. If it is too crooked, it can be stacked in groups of five, one in a positive and one inverted, and a heavy object is pressed on it. If there is still a next one, it can be left for the next production after being flattened. In addition, the height of the stacking board is preferably not higher than that of the two ends of the baffle plate. An excessively high stacking height will result in unstable feeding and affect the feeding accuracy. As shown in Figure 1.
Figure 1 The ideal stack height The height of the printing pressure control Each pressure is shown in Figure 2.
Figure 2 Contact pressure of various pressure corrugated board and printing plate (commonly known as printing pressure)
Due to the particularity of the corrugated board structure, the printing pressure cannot be too large during adjustment. Because excessive pressure will cause the compressive strength of the corrugated board to be reduced, it is appropriate that the board can gently contact the printing plate. In the actual production operations, some changes (such as stencil, plugging, dewing, etc.) may occur due to factors such as the speed of the machine, the warping of the corrugated board, and changes in the characteristics of the ink and ink. Therefore, in the production process, it is necessary to spot-check, control the pressure and ensure the printing quality.
Contact pressure between plate and anilox roller (commonly known as ink pressure)
In corrugated carton flexo printing, the control of ink pressure is an important factor in printing. In general, the size of the inking pressure control can be observed from the appearance of printed prints. If the edge of the print image has overflowed ink or if there is a phenomenon of heavy edges, it means that the pressure of the ink at this time is too large and can be adjusted to a smaller value. If there is a phenomenon of missing printed artwork, it means that the ink pressure is a little lower. At this time, it is necessary to adjust the ink pressure appropriately. Excessive inking pressure and proper inking pressure effects are shown in Figure 3.
Too much pressure on the right Inking pressure
image 3
When the contact pressure of the rubber roller (or scraper) and the anilox roller is used for inking the printing unit, the nip roller (or scraper) must first be adjusted to the gap pressure with the anilox roller. The ink pressure adjustment of the general rubber roller and the anilox roller is -2.5 to -3.0mm. Squeegee and anilox roller pressure gap adjustment, the general new blade is 0.3PSi, the old blade can be adjusted to 0.5PSi (machine control panel scraper barometer data display). Since the rubber roller or blade wears as the time for the machine to run increases, this data is not absolute. Therefore, both pressures should be adjusted in time according to the actual situation. In addition, after the end of production, the pressure of the rubber roller (or scraper) must be completely released after the equipment is cleaned, so as to avoid long-term extrusion and deformation between the two after the shutdown, which affects the uniformity of ink transfer in the future.
With the pressure of the paper roller This type of machine in the production process, the transmission of corrugated paperboard mainly by the respective unit with the paper roller to transfer, so the pressure of the paper pressure roller directly related to the paper, printing, slotting, die Is it accurate to cut the position? Adjusting the gap of the paper roller should be a gradual process, that is to say the following unit with the paper pressure roller should be slightly heavier than the front unit with the paper pressure gap pressure, the gap pressure is generally lower than the actual thickness of the corrugated paperboard 1~2mm.
In order to control ink and water, ink ink control must first understand the characteristics of ink. The main features of inks consist of two major aspects: viscosity and pH.
Viscosity control In general, the field version ink viscosity printed on cattle card paper is in the range of 22 to 25 seconds, the ink viscosity of dots and small graphic texts is in 14 to 18 seconds, and the field version of printing ink on coated paper is in the viscosity of 18 to 21 seconds. The ink viscosity of dots and small images is 12 to 15 seconds (measured in a #3 viscosity cup). When producing large quantities of orders, it is best to pay attention to the ink viscosity every half hour to ensure the printing quality.
pH control The pH of aqueous inks is controlled primarily by ammonia compounds, commonly known as ammonia stabilizers. Due to the volatile nature of ammonia during the printing process, which causes pH changes, the pH of the aqueous ink is generally between 8.2 and 9.5, and its printability is best. When the pH value is higher than 9.5, the alkalinity is too strong, the viscosity of the aqueous ink decreases, the drying speed becomes slower, and the water resistance becomes worse; when the pH is lower than 8.2, the alkalinity is too weak, the viscosity of the aqueous ink increases, and the drying proceeds. As the speed becomes faster, the ink and ink can easily dry in the cells of the printing plate and the anilox roller, resulting in a decrease in the ink storage volume of the anilox roller and easily causing problems such as a dirty plate.
In addition to controlling the characteristics of the above two major inks, it is necessary to observe the printing color in the mass production process to avoid overly obvious color difference. In order to control the color difference, we must pay attention to some details. The ink on the machine is better not to be on the whole barrel, and the amount of ink on the machine can be controlled at about 15kg each time. In the production process, it is advisable to observe diligently, diligently add ink, and less ink.
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