NEWS

Chromatic aberration is very common in the carton printing industry and is directly related to the printing effect.People find it good and bad, comfortable and uncomfortable.

These customers have strict requirements for color when making cartons of big brand products such as Wahaha, Mengniu, Hisense, Haier, and Midea, because this directly affects their brand influence and product sales.Imagine that if the appearance of the carton is not good, it gives the impression that the product is not good, and the sales volume will naturally be greatly reduced.The reason why many carton factories can't get these customer orders is basically because of the color difference.

So where should we control the color difference?

Control from color sample and color card

The source of the printed color is the color sample provided by the customer.If the color sample is inaccurate, the production unit cannot guarantee that the printed color is consistent with the customer.After the production unit takes the color sample from the customer, it should compare the printing and proofing with the color sample, and determine the printing color at the same time with the customer, and set the upper and lower limits of the printing color.After the color sample is formulated, the manufacturer shall strictly keep it by a special person.The color palette and color card are replaced every three months to achieve hue, name, and saturation.

This is conducive to the consistency of color between customers and manufacturers, manufacturers can obtain accurate printing color requirements, and can carry out reasonable control within the color range.

From ink control

In the actual printing process, the two characteristics of ink viscosity and pH value need to be controlled.Confirm the viscosity and PH value of the ink during proofing.After the customer confirms, the viscosity, pH value, and fineness of the proofing ink will be remade and installed for inspection and execution; at the same time, the superior will stir the ink first and install the ink pump on the ink supply system; if the ink is not stirred for a long time, the resin in the ink will precipitate, and once it settles, the color of the ink will darken.Therefore, increasing the stirring ink pump is conducive to the control of ink viscosity.

The control of ink lies in data recording.The data value is used to control the color of the ink.At the same time, the ink mixing pump is used to control the viscosity of the ink, so that the resin in the ink flows, which can improve the fluidity of the ink.This is one of the necessary conditions for consistent color.

From machine speed control

The speed of the printing machine is a very critical point.For example, there will be a big gap between the printing colors of 70 sheets/min and 180 sheets/min.Because the rubber rollers of the printing machine have medium and high speeds, the vibration of the equipment is also different; the vibration of the equipment brings the amount of ink between the rubber rollers, and the color darkens when the amount of ink is touched.

Therefore, the speed difference between the printing machine and the normal production speed will not be too great.To maintain the printing speed in the production process, it is necessary to maintain a uniform speed.

Printing pressure control

In order to achieve the same color of the same batch of orders, the printing pressure is also an important factor that needs to be controlled.Because the printing pressure is too large or too small, it also directly affects the change of printing color.The printing pressure of this machine includes two aspects, one is the contact pressure between the anilox roller and the printing plate, and the other is the printing pressure between the printing plate and the cardboard.Therefore, in order to control the consistency of printing color, a stable and uniform printing pressure is maintained during the printing process.

The influence of printing pressure on color is not the main reason.The printing pressure has the characteristics of indirectly affecting the color of the printing, so the control of the printing pressure should be lighter.

Make sure the anilox roller is clean

In addition to the above 4 points, be sure to clean the anilox rollers of each printing unit before printing.Because if the mesh of the anilox roller is clogged, it will affect the uniformity of ink transfer, and the color of the printed graphics and text will be uneven.

The plot of the anilox roller is very important.If the mesh is blocked, the amount of witty ink will be directly reduced, the printed color will be lighter, and the printed color saturation is not high enough.Therefore, the anilox roller of the printing machine should be cleaned regularly.test.

Carton printing, as long as the above points are achieved, the color difference can basically be controlled within the allowable range.