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Membrane Switch Production Process How To Detect The Ink Index

Membrane switch production process how to detect the ink index

In the production process of membrane switches, the raw materials are mainly films, inks and solvents. There are several basic indicators of ink are listed within the scope of the membrane switch detection: viscosity, fineness, hue, adhesion fastness.

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When measuring the viscosity, it is best to dilute to a specific viscosity (for example, 18 seconds/25°C) with an appropriate mixed solvent to calculate the amount of solvent added, so that it is possible to eliminate the "false viscosity" phenomenon that some inks may bring. It's thick, but it doesn't add any solvent.) The detection of the adhesion fastness can use the national standard (GB/T 13217.7-91), but it may not be enough for some surface printing inks. It is better to simulate the specific requirements of the product packaging and post-processing conditions for testing.

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The good quality of solvent quality directly affects the quality of ink printing, and solvent quality is the most difficult to grasp. The main indicators for distinguishing the quality of the solvent are purity and moisture content. Quantitative qualitative detection of the solvent is best detected by chromatography, but the required equipment is expensive and the technical requirements are high. If light is for printing and dry compounding processes are not considered, here are a few simple and practical methods.

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Look at the appearance of the solvent. At the very least, it should be clarified and transparent. If there is turbidity or floating material, the batch of solvent should be used with caution. After smelling the odor of the solvent, the operator usually has a general impression of the odor of a particular solvent after a relatively long period of exposure to the commonly used solvent. If the odor of the batch of solvent is found to be not pure, it can be confirmed that the batch of solvent is not of high purity and impurities. many. Use the dissolving effect of different principles to roughly determine the content of water in the solvent: Take a large half cup of clear toluene solvent with a 100 ml glass graduated cylinder, take a small amount of solvent such as esters or ketones to be tested, and pour the toluene into the solvent. Into the toluene, observe the presence of turbidity (milky white) phenomenon, if any, the water content in the solvent is seriously exceeded, experience shows that when the water exceeds 0.5%, this phenomenon is obvious. The moisture content of the benzene solvent can be determined by drawing a solvent through a long glass tube and observing whether there is delamination.

Hangzhou Kaike Electronics Co., Ltd.

Address: No. 2. Dadi Road, Haining Agricultural External Development Zone 314408,

Zhejiang, China

Contact Person: May Wong

Telephone: 86-571-86830690     Fax: 86-571-86687367

Cell Phone: 86-15158112598