What is the best angle of the scraper? How to measure?

How much is the angle of the squeegee? How to measure the blade angle during actual production?

Scraper angle setting

In the process of gravure printing, according to the experience of industry professionals, the most suitable squeegee angle should be 60 ~ 65 °. For many years, gravure workers have basically set their doctor blade positions and angles based on experience. No one will check what the doctor blade angle is. In fact, there is no suitable tool for checking the doctor blade angle.

The blade angle of 60 ~ 65 ° is an empirical value. The benefits of using this angle:

1. It can reduce the wear of the scraper;

2. You can use the lowest possible scraper pressure to achieve the purpose of scraping ink;

3. During the entire printing process (before the next replacement of the blade), the contact area and pressure of the blade and the printing plate roller can be kept to a maximum extent to ensure the stability of the same batch and the same color.

Method for measuring scraper angle

1. Homemade angle gauge

The angle set by the scraper can be measured by a self-made angle gauge. The production method of the angle gauge is very simple: draw an arc on the paper, the diameter of which should be consistent with the diameter of the printing plate roller to be measured, and then draw the normal and tangent of the arc; from the intersection of the normal and tangent Draw a straight line with an angle between 60 and 65 °.

2. Commercially available angle gauge

There is also a ready-made angle gauge on the market. The same angle gauge can be applied to plate rollers of various diameters. However, the preset blade angle is 60 °.

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