Why need to do drop Angle and contact Angle tests for glass cover plates?

- Aug 17, 2019-

Droplet Angle and contact Angle is an abbreviation of this detection equipment in the industry;Its professional name is: optical contact Angle measuring instrument;The contact Angle is mainly used to analyze the wettability (hydrophilic and hydrophobic) of the product.

Glass cover need to test with contact Angle because: glass plate surface needs to be a waterproof coating technology of fingerprint processing, coating process is divided into two kinds: one is vacuum coating, a kind of direct injection for AF, finish the process after processing to the product is need to super hydrophobic effect (above 115 ° before industry standard: wear-resisting, wear after the minimum above 100 °), so you need to contact Angle for quality monitoring, judge whether the coating process to achieve the customer's requirement standard. 

The contact Angle tester is used to test the surface characteristics of the glass lens, and the hydrophobic degree of the glass surface is indirectly analyzed by the Angle of water droplets, so as to judge the anti-fouling force of the product surface.Divided into the following three test methods:

1. Test the water drop Angle directly on the finished product.

2. Do drop Angle test before surface treatment.

3. Do the drop Angle test after several times of wear resistance.

Through three kinds of tests to compare the Angle of water droplets, strictly control each level, to ensure the high quality of products

After coating or surface treatment, the naked eye can not distinguish the treatment effect, whether it reaches the anti-fingerprint and wear-resisting condition, through the droplet Angle measurement, in order to reduce rework or defective product waste.

Basic principle of droplet Angle test instrument: droplet Angle is defined as in solid and liquid.At the three-intersection interface of gas, the included Angle between the gas-liquid interface and the solid-liquid interface, and the water drop Angle is the scale to show the moisture on the solid surface. Most solid droplets are used for measurement, and low contact Angle indicates the high moisture (hydrophilic) surface is easy to stick.High contact droplet Angle indicates surface hydrophobicity, heavy organic contamination or poor adhesion.The Angle of contact with a flat solid surface is determined by the end of the water-drop curve at the liquid-solid-gas junction and the contact point at the solid surface.