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How does Loss in weight feeder work?


Loss-in-weight feeders from High Dream measure directly the weight of the material  to maintain a predetermined feed rate. Due to the accurate metering performance and the excellent user-friendliness, twin screw loss in weight feeders are ideal for continuously feeding and metering powders and granular materials.


The feed rate of High Dream product is measured in kilograms per hour (e.g., kg/h). The operator programs the set point in the feeder control. Continuously weighing the hopper maintains a constant discharge of bulk material from the hopper, including the bulk material contained and adjusting the speed of the feeding device accordingly.


By comparing the actual loss rate of the double screw loss-in-weight feeder with the desired set point, precise adjustment can be achieved. When feeding with single screw feeders, solid materials with poor fluidity materials tend to bridge. This material builds up inside the outlet tube, causing fluctuations in the consistent output of the screw feeder. In such case, our ST 1 Twin screw loss-in-weight feeder with co-rotation will be the best choice. For more cohesive powders, twin screw feeders are often used due to their "self-wiping" effects, which minimize or even eliminate material buildup as well as help transport the material.


Since weighing determines the feeding accuracy,  the feeder and the weighing unit must be isolated from external forces, friction, vibrations, or shocks. Typically, it is accomplished by flexible connections installed at the feeder inlet and outlet.


The feeders must be mounted on shock mounts, and air currents near the feeder must be minimized. The modern load cells which High Dream provides are the sophisticated methods for digital filtering applied by the weighing data to eliminate typical plant vibrations.


An error in feed rate may occur if the loss and weight feeder discharges material into an unstable pressure environment, such as a vacuum or pressurized conveying line. The pressure pulse exerts an upward force on the hopper outlet, slightly lifting and reducing the instantaneous weight of the hopper. The controller interprets this as too much material delivered and  slows down the screw feeder, resulting in the feed rate is lower than desired.


On the contrary, a consistent positive pressure inside the hopper can also limit the weight loss detected. The controller interprets this as insufficient material being fed and speeds up the screw feeder, resulting in the actual material being overfed.


Twin screw loss-in-weight feeders of High dream, can automatically to adjust weight signals and the changes in pressure within a feeder. Consequently, the feeder control can compensate for pressure changes and regulate more accurately the feed rate.

It features intelligent fault alarms, so equipment failures can be easily detected, making maintenance easier. It is also equipped with a high-speed staggered discharge function to prevent material blockage.
It is also equipped with automatic feeding and is known for its high precision and high standards. All of its components are based on international standards, enhancing the interchangeability of the whole machine parts.
The integrated welding of the chassis and the middle seat greatly increases the strength of the machine. Its operator interface can be set to many languages, which makes it highly competitive in the global market.It supports multi-stage weight calibration and is compatible with many products made of different materials.
 Its precise construction greatly enhances the feeding rate and allows the material to flow smoothly. Highdream's perfect mold manufacturing technology makes sure that the weigher can be used to better prevent materials from falling and can effectively control the materials adhesion problem to ensure weighing accuracy.

Why Choose High Dream Twin Screw Feeder

Weighing & Packing Solutions

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High Dream lost in weight feeder has the features of high control precision, fully sealed design, simple operation, good stability, etc., and can realize high-precision continuous quantitative feeding.

The twin screw feeder is widely applicable to various materials, including powder, glass fiber, and sheet materials with poor fluidity, and provides them with a high-precision loss-in-weight feeding solution. The feeding range of the twin screw feeder is 15-8,000 L/hr, and the feeding capacity varies according to the characteristics of the material.

twin screw feeder

lost in weight feeder

How to use a lost in weight feeder (including a twin screw feeder)?

Step 1: The calibration of the loss-in-weight feeder is highly related to the stable operation, so the first thing to do after the loss-in-weight feeder is installed is to calibrate the material used for the test in the hopper of the loss-in-weight feeder.

Step 2: During the operation of the lost in weight feeder (including the twin screw feeder), the weighing sensor will collect the most accurate flow data in real-time and send it to the weighing controller for processing. Therefore, after the calibration is completed, it is necessary to ensure that the loss-in-weight feeder (including twin-screw feeder) can feed normally and output flow data stably.

Step 3: After calculation, the real-time processing data are sent to the touch screen respectively for screen display and data communication, and the panel controls the motor speed. In this way, the purpose of adjusting the flow rate in real-time can be achieved. 

High Dream lost in weight feeder has strong applicability, but the characteristics of the materials are different. It is very necessary to choose the appropriate twin screw feeder or lost in weight feeder according to the actual needs. If you have any questions, please contact us, we will customize the exclusive weighing solution for your project as soon as possible to solve your worries.



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