Plastic packaging printing small knowledge
Release time:
2020-08-07
3D movies are familiar to everyone. Today we don't talk about the movie, talk about the knowledge related to printing. The phenomenon of inaccurate overprinting is similar to the image of the movie screen pattern without 3D glasses.
3D movies are familiar to everyone. Today we don't talk about the movie, talk about the knowledge related to printing. The phenomenon of inaccurate overprinting is similar to the image of the movie screen pattern without 3D glasses.
overprint errorMost of them are common defects in printing. The phenomenon is that in the process of multi-color overprinting, each color cannot be completely overlapped and there is a certain deviation. Multicolor printing, the printing position is not correct, resulting in dislocation and blank. There are many factors that affect the pattern overprinting, and there are three main factors: printing materials, printing equipment, and operation process.
Printing materials are the basic factors that affect overprinting. Due to the different properties and requirements of various packaging materials, it is necessary to choose different materials for composite processing, such as high temperature resistance, corrosion resistance, moisture resistance, puncture resistance, etc. Commonly used printing materials are BOPP, PET, PA, etc. Commonly used composite materials are CPE, CPP, PVDC, etc. Different material properties and different printing tensile strength will have an impact on overprinting. The overprinting difficulty of aluminum foil and paper is relatively small, and the overprinting difficulty of plastic film is relatively large, especially the overprinting of PE products. Of course, this is only one of the influencing factors, the printing factory will consider the comprehensive factors, through the technical process scheme, to minimize the problem of overprinting caused by material properties.
Printing equipment:
The accuracy and performance of the whole equipment, overprinting tension control, heating air supply system, embossing rubber roller, plate roller, and other systems cooperate, these conditions determine the temperature, pressure, parallelism, elongation, etc. during overprinting, and the color system itself limits its accuracy.
The increase of the plate roller is not suitable, the reverse increase, the wrong order of the plate roller is easy to produce vertical color is not allowed;
The rubber deformation of the embossing roller, insufficient elasticity, and different friction between the film and the plate roller cause inaccurate longitudinal overprinting, which is as consistent as possible when grinding with the plate roller. Keep the pressure roller in good condition.
The tension setting of the substrate is unreasonable, the tension is too small, the substrate is loose, and the vertical and horizontal color matching is not allowed; If the tension is too large, the substrate shrinks in the transverse direction and the longitudinal color matching is unstable, and the tension is adjusted accordingly.
The temperature is not suitable, especially the oven temperature is too high, the cooling roll temperature is too high to deform the film, for the film is not too flat should be appropriate to increase the temperature of the preheating box.
The unbalanced air intake and exhaust air volume in the oven causes the film to shake in the oven. The air intake and exhaust air volume shall be measured by anemometer and controlled.
The installation of the plate roller is inappropriate. If eccentricity occurs, the ink on the plug must be scrubbed clean before the installation of the plate roller. The increase of the plate roller is not appropriate; The printing line is too long; The distance between the two-color close overprinting should not be too far.
Scraper pressure is too large, the ink viscosity is large, the rubber roller pressure is too large, the plate roller diameter is too large or too small, the static electricity of the printing material is too large, the printing material itself defects caused by overprinting is not allowed, etc.
Key words:
recommend News
DALIAN YIHAI PACKAGING CO., LTD
Office address: No. 161-1, Gangpu Road, Zhongshan District, Dalian
Factory Address: Chengguan Industrial Park, Zhuanghe City, Dalian
Pay attention to enterprise two-dimensional code
Sweep and learn more about business information.
©All rights reserved of Dalian Yihai Packaging Co., Ltd.
