In order to improve production efficiency, the current flexographic printing presses are very focused on improving the drying capacity. Generally, a variety of drying methods such as natural wind, hot air and infrared rays are used. 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 films may have a lateral size deviation, and the error is less than 1 mm when the hour is small; when the error is large, it is 2 mm-3 mm. In actual production, if there is no problem with the film or the printing plate, the deviation of the lateral dimension is caused by two opposite processes of printing wet and drying.
About 50% of the composition of water-based ink is water, then, for thin paper, if printing water-based ink on a large area, the wet printing on the surface of the paper will expand and become wider. The larger the printing area, the lower the anilox roller line number The phenomenon of widening becomes more obvious. When drying after printing, the paper narrows due to shrinkage. The greater the heating amount, the more water volatilizes, and the narrower the paper width becomes. The heating and drying system of most flexo printing machines (including UV curing system) has a minimum speed starting working point, such as 20 m / min. For safety reasons, below this speed value, the infrared and ultraviolet drying devices are not turned on; it will only turn on when it reaches or exceeds this value. If the startup speed is slightly higher than this speed value, the amount of paper heating is large and the shrinkage is obvious.
The farther apart the unit, the greater the lateral overprint error. Therefore, in the printing production process, the speed of the printing machine should be increased as much as possible and unnecessary hot air and infrared drying should be reduced as much as possible, so as to avoid the occurrence of lateral overprinting errors. In addition, in a printing process, the machine speed is appropriately increased, and overprint errors will also occur. Tension, mechanical speed and temperature have a constant value, often 1: 1.2 (1.3): 1.
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Place of Origin: Guangdong, China(mainland)
Surface Material: Customized
Inner Material: Velvet / foamed plastic
Color: Customized
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Logo Printing: Customized
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