Energy-saving lamp electronic powder / phosphor viscosity online measurement

Electronic powder is one of the key materials for the manufacture of energy-saving lamps. The thickness of the powder coating directly affects the characteristics and life of the lamp. At the same time, the thickness of the phosphor powder coating layer of the lamp is inconsistent, which is one of the main reasons that affect the consistency of the luminous efficacy of the energy-saving lamp. The internationally advanced energy-saving lamp production company adopts strict control on the powder coating process: online monitoring of the viscosity change of the suspension in the slurry bucket during the process of continuously stirring the slurry bucket suspension becomes the preferred advanced technology. .

At present, a new type of FWS-3 online viscosity monitoring sensor produced by Shenzhen Xianbo Technology has been applied in energy-saving lamp manufacturing enterprises and achieved good results. FWS-3 online liquid viscosity sensor is an ideal choice for all kinds of coatings, various substrates of gel ink food, pharmaceutical, chemical processing, rubber, oil, or any application requiring high precision and fast reaction time viscosity measurement. The method guarantees excellent accuracy and repeatability over a wide range of continuous and real-time measurements. It is an excellent solution for difficult-to-measure coatings in suspension, corrosive, flow and foam.

Ultrasonic vibration technology is used. International advanced level of high precision, long-term stability, no moving parts, no maintenance. Unaffected by the environment for a wide range of operating temperatures, working pressure and fluid viscosity changes without special installation. Figure 1 is the sensor outline drawing.

Figure 1 sensor outline drawing

The energy-saving lamp manufacturing enterprise is a large enterprise specializing in the production of energy-saving lamps. We have carried out the application data of monitoring electronic coatings in the production process to illustrate the superior performance of the online viscosity sensor. The company uses organic coatings (organic soluble binder is nitrate cotton glue, acetate acetate is solvent). The production process uses mechanical or magnetic constant temperature stirring to stir the paint at a constant speed. The schematic diagram is shown in Figure 2.

Figure 2 Schematic diagram of viscosity measurement of electronic paint

Figure 3 shows the output response curve of a solvent-diluted electronic paint viscosity sensor for a good electronic coating. The curve is based on the weight percentage (WT%) of the added solvent relative to the good electronic coating. The sensor's output response is fitted to the Y-axis. It can be seen from the curve that the output of the sensor responds linearly to the concentration of the organic diluent added to the electronic paint. And the trend is obvious.

Figure 3 sensor response curve

Figure 4 shows the corresponding curves for the paint dynamic viscosity and sensor output of the production process. The viscosity of the electronic coating is measured by a rotational viscometer during the production process and corresponds to the curve fitted by the sensor output.

Figure 4 Response curve of sensor to electronic paint viscosity

As can be seen from the cluster 4, the output of the sensor has a linear relationship with the dynamic viscosity of the electronic paint. As the viscosity of the electronic paint increases, the frequency value provided by the sensor output decreases linearly and the response is sensitive.

Conclusion: It can be seen from the above production data that the FWS-3 online viscosity sensor can monitor the viscosity change of electronic coatings sensitively and accurately online, and the output data is stable and repeatable, completely overcoming the fluidity and suspension effects of electronic coatings. The sound and light alarm can be performed according to the set value, so as to remind the operator to take timely measures. It plays an important role in ensuring the production process control of energy-saving lamps and improving the quality and life of energy-saving lamps.

Edit: Sophy

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