Brief analysis of two commonly used online glazing methods in printing

In modern printing, online glazing is a commonly used method for efficient processing, and there are currently two commonly used methods.

1. Roller coating

A roller coating device is used to transfer the varnish to the surface of the carton. The coating volume and pressure of the coating unit are controlled by the printing press control center. The coating liquid supply mechanism of the coating device of the Heidelberg printer can control the whole process of the coating liquid supply. The coating liquid is pumped from the storage tank through the hose to the coating liquid bucket by the electronic double diaphragm pump. The liquid level and the circulation of the polishing liquid are monitored by a potentiometer to ensure that the coating liquid is evenly supplied. The ultrasonic monitor can monitor the coating amount of the coating liquid at any time. KBA Rapida 105's roller varnishing device has two-roller systems that operate clockwise and three-roller systems that operate in reverse. When working in a two-roller clockwise operation mode, the metering roller is disengaged, and the coating amount is adjusted by the pressure between the coating liquid hopper roller and the application roller, and the structure is simple. When working in the form of three-roller reverse operation, the glazing roller and the liquid bucket roller operate in reverse to obtain a very bright glazing film layer: at the same time, when using a high-viscosity glazing liquid, it is not necessary to increase the pressure between rollers To achieve a thin and uniform coating purpose. This roller glazing device has the characteristics of short transmission path, few contact points, difficult to dry the glazing liquid, uniform transmission of the glazing liquid, simple and convenient operation and so on.

2. Scraper glazing

A closed squeegee glazing system is used, consisting of a ceramic anilox roller, a closed squeegee and a flexible resin coated plate roller. The main advantage is that by choosing different ceramic anilox rollers, coating can be completed accurately according to the required coating amount, saving glazing oil; with rapid replacement of the anilox roller, glazing coating plate device and full-surface coating, partial Glazing function. It is usually composed of two scrapers and a ceramic anilox roller for metering. The upper and lower scrapers and the anilox roller form a closed box structure. The polishing liquid is pumped in through the pipeline. The squeegee glazing device has the characteristics of uniform and constant glazing, high quality, good effect, good environmental protection, economy, and easy to achieve high-speed glazing. And it can adapt to the gold and silver glazing on the surface of the carton. The glazing coating can achieve a very high wear resistance.

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