Some matters needing attention in plate making before color box printing
Release time:2021-07-09

In the process of color box printing, quality problems caused by inadequate pre-press plate making occur from time to time, ranging from a waste of materials and man-hours to a product scrapping and causing serious economic losses. To prevent the occurrence of the above problems, we should pay attention to the following aspects.

(1) Different types of cartons need to be put together on a printing plate for gravure printing. If products with the same or similar tones are not put in the same vertical position during the imposition, it may appear that the A product can meet the proofing standard , Type B products are basically close to the proofing draft standard, Type C products have a slight color difference with the proofing draft, and Type D products have a large color difference between the proofing draft. Therefore, in lithographic printing, warm, cool, and mid-tone products should be put together in the same vertical position during imposition, so that high-quality products can be printed.

(2) If the non-graphic part of the carton is placed at the gripper during imposition, and the trailing tip is not a continuous image, if it is a flat screen or a solid field, then it is easy to produce "ghost images" during printing. Ruba seriously affects product quality. At this time, the non-graphic part should be placed on the trailing tip, so that "ghost shadows" will not appear.

(3) When making a plate, it should be noted that the carton product line should not be omitted in order to save film, but to rely on the printing and printing staff to calculate the position of the grip and the finished product, which will greatly affect the production efficiency and may also be caused by the printing. And the printing staff temporarily neglected the characters, causing a major accident.

(4) The output film usually does not contain the marking line, but if the gripper and the trailing tip are blank, it will cause great inconvenience to the color box printing and positioning. In this regard, it is necessary to make a drawing marking line on the film. For packaging cartons that do not need to be mounted with corrugated cardboard, the drawing marking line is made on the side of the body; for packaging cartons that need to be mounted with corrugated cardboard, the drawing marking line is made towards the outside.

(5) Ensure that the film meets the color box printing requirements. After the film is output, carefully check whether the graphics on the film are consistent with the proofing draft (the carton die line used as the check standard must be standardized).

(6) To ensure the correct registration between different films, this is because a set of films is generally output in two times, and its registration accuracy is easily affected by some objective factors. Once the output film has quality problems, it should be remade.

(7) The metal packaging of the film and the proofing draft should be carefully compared before printing. If the film density of the main color is too large, the exposure time during printing should be increased to avoid the color box printing color is too heavy; if the density is too small, it should be reduced Exposure time during printing, so as not to lose dots and affect color reproduction.

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