Analysis of the application of mass flow controller in the dye industry

A Brief Look at Mass Flow Controllers in the Dye Industry Using Pumps to Control Dosing Undiluted Dye Major home furnishing companies around the world use liquid colorants (dyes) to add color to their detergents, laundry care and cleaning products. Colorants are very concentrated and usually only need a small amount to give the final product the right color. The two important requirements are: Repeatability: The color consistency of the final product is very important, just like every perfume bottle must be the same color. Therefore, color quantification must always be highly consistent. Accuracy: Accurate dosing of colorants is highly desirable as colorants are usually not cheap. How to properly dose liquid colorants? The first solution that comes to mind is to use a pump to dose the colorant. However, this is not a very accurate dosing method, at least not for this application. Combining pumps and mass flow controllers can help you control pumps for better dosing. How does pump control work? The flow produced by the pump is volume flow and all characteristics vary accordingly. Accuracy is strongly influenced by the properties of the fluid, related to temperature and pressure. Additionally, most pumps cannot handle fluctuating back pressures as this creates slippage, instabilities and high deviations in flow rate. The way to improve the accuracy is to measure the flow of the pump by mass flow meters, because these meters measure the true mass flow (eg kg/h, g/h, etc.). The output of the meter is usually connected to a PID controller which corrects the rotational frequency (RPM) of the pump. The disadvantage of this method is that the flow of the pump is unstable, making it necessary to filter the output signal, resulting in a slow output signal. Since this signal is also used as a control signal, the response and control are slowed down. Pump Control Using a Mass Flow Controller To avoid this, you can use a mass flow meter with an integrated PID controller with an independent control signal to control the pump speed. Since this control signal, unlike the output signal, is not subject to filter interference, the flow meter and pump combination can achieve unrivaled control speed and stability. In the event of a back pressure change, the pump is immediately adjusted to run faster or slower, resulting in an immediate correction of the flow to maintain the desired accuracy. This method of flow measurement is independent of fluid properties, so fluid changes require no recalibration or the use of conversion factors. Small Flow Pump Control In the case of liquid colorant dosing, (ultra) small flow mass flow controllers bring great convenience in dosing undiluted dye. There is no need to mix the dye with water to create a sufficient flow. Not only is undiluted dye more concentrated and of higher quality than water-based mixes, it also saves water and prevents algae growth in the unit.

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