Handheld paper bags look simple to make, but there are many particular things about them. Today, let Jinan handbag printing factory share the solution to the shrinkage problem of tissue handbag printing.
With the rapid development of the market economy, in order to improve the production efficiency, the current flexographic bag printing presses pay much attention to improving the drying capacity. Natural air, hot air, infrared ray and other drying methods are generally adopted. Some combined mechanical equipment has two sets of UV curing systems.
In this way, a phenomenon will be found in proofing or production, that is, a set of plates made of the same set of film has a deviation in the horizontal size, and the error is less than 1mm; When the error is large, it is 2mm - 3mm. In actual production, if there is no problem with the film or printing plate, the deviation of the transverse size is caused by the opposite process of wet printing and drying.
About 50% of water-based ink is water. For thin paper, if water-based ink is printed in a large area, the paper surface will expand and become wider. The larger the printing area, the lower the number of anilox rolls, and the wider the phenomenon is. When drying after printing, the paper becomes narrower due to shrinkage. The greater the heating amount, the more moisture volatilizes, and the narrower the paper becomes.
The heating and drying system (including UV curing system) of most flexographic printing machines has a low speed starting point, such as 20m/min. For safety, when the speed is lower than this value, the infrared and ultraviolet drying devices are not turned on; Only when this value is reached or higher will it be opened. If the startup speed is slightly higher than this speed value, the paper will have a large amount of heating and obvious shrinkage.
The farther the cells are, the greater the horizontal overprint error. Therefore, in the printing production process, we should try to improve the speed of the handbag printing machine and reduce unnecessary hot air and infrared drying, so as to avoid horizontal overprint error. In addition, in a printing process, if the machine speed is appropriately increased, overprint errors will also occur. Tension, mechanical speed and temperature have a constant value, usually 1:1.2 (1.3): 1.
Here is the solution to the problem of handbag printing shrinkage. Do you understand? If you don't understand something, welcome to our website http://www.xinfengyinshua.cn Consult and understand!济南印刷厂讲解的内容 更多的内容 请咨询公司官网http://www.xinfengyinshua.cn/