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How to detect ink indicators in the production process of thin film switches

Release time:

2023-06-06 08:50

In the production process of thin film switches, the main raw materials are thin film, ink, and solvents. And there are several basic indicators of ink that are listed within the scope of thin film switch detection: viscosity, fineness, hue, and adhesion fastness.
When conducting viscosity testing, it is best to dilute the matching mixed solvent to a specific viscosity (such as 18 seconds/25 ℃) and calculate the amount of solvent added. This can eliminate the possibility of "false viscosity" caused by some ink (the ink may appear thick, but the solvent cannot be added). The detection of adhesion fastness can use the national standard (GB/T13217.7-91), but for some surface printing inks, it may not be enough. It is best to simulate the specific requirements of product packaging and post-processing conditions for testing.
The quality of solvents directly affects the quality of ink printing, and solvent quality is the most difficult to grasp. The main indicators for distinguishing between good and bad solvents are purity and moisture content. Quantitative and qualitative detection of solvents is best achieved through chromatography, but the required instruments are expensive and have high technical requirements. If it is only for printing and does not consider the dry composite process, here are a few simple and practical methods.
At the very least, the appearance of the solvent should be clear and transparent. If there is turbidity or floating matter, this batch of solvent should be used with caution. After smelling the odor of solvents and being exposed to commonly used solvents for a slightly longer time, the operator has a general impression of the odor of a specific solvent. If the odor of the batch of solvents is found to be impure, it can be confirmed that the purity of the batch of solvents is not high and there are many impurities. Using the principle of different dissolution effects to roughly determine the moisture content in solvents: Use a 100ml glass measuring cylinder to take half a cup of transparent toluene solvent, take a small amount of solvents such as esters or ketones to be tested, and evenly pour them into toluene. When the solvent is first poured into toluene, observe for any turbidity (milky white color) phenomenon. If so, the moisture content in the solvent seriously exceeds the standard. Experience has shown that when the moisture exceeds 0.5%, this phenomenon is very obvious. The moisture test of benzene solvents can be determined by extracting the solvent through a long glass tube and observing whether there is any layering phenomenon.