How does refill affect accuracy?

Refill briefly disturbs the weight signal, so the controller switches to a volumetric model during that moment and returns to gravimetric control afterwards. Short, frequent refills from a vacuum conveyor keep the disturbance small and the accuracy stable.

Which discharge type suits my material?

Screws cover most free-flowing and slightly cohesive powders. Vibratory trays suit fragile granules and materials that smear on a screw, and belts are used where the product must be handled very gently. We confirm the choice from the material's flow behaviour.

Can several feeders work together?

Yes. Multiple feeders, each with its own controller, can be coordinated by a line controller so that a recipe is delivered as one combined stream. This is common for extruder feeding and for multi-additive blending lines.

What information is needed for a quotation?

Please provide the material and bulk density, required rate in kg/h, turndown ratio, refill method and interval, the equipment being fed, and any hygiene or explosion requirements.

Weighing & Dosing

Loss-in-Weight Feeder

Name: Loss-in-Weight Feeder
Brand: CYprocess
Availability: InStock

CYprocess loss-in-weight feeders — also called gravimetric feeders or LIW feeders — dose powders and granules continuously by measuring how hopper weight changes over time. Screw, vibratory or belt discharge under closed-loop control holds a stable set rate.

View Details Datasheet (PDF)Request a Quote All Products

Shanghai-built. Drawings come with the quotation, and material certificates are available on request. Factory and documents

Loss-in-weight feeder with weighing frame

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Overview

About Loss-in-Weight Feeder

How this equipment works in powder handling lines and what to consider when selecting it.

Working principle

The feeder hopper sits on load cells and the controller records the weight loss per unit time. Comparing that figure with the set rate, the control loop adjusts screw or belt speed continuously, so the delivered mass stays constant even when bulk density or flow behaviour drifts.

Options and integration

Refill can run from a vacuum conveyor or a silo without interrupting feeding. Screw, vibratory and belt discharge cover different material behaviours, contact parts are available in SS304 or SS316L, and several feeders can be combined into one recipe-controlled line.

Where it fits in the process

Material Intake

Conveying

Dosing

Mixing

Packaging

Features

Key Features

Design points that make the Loss-in-Weight Feeder practical for industrial powder plants.

True gravimetric loss-in-weight control

Continuous or batch refill modes

Screw, vibratory or belt discharge options

High-resolution load cells with PLC / HMI control

Refill from vacuum conveyor or silo without stopping the process

SS304 / SS316L contact options for hygienic duty

Multiple feeders combinable into one recipe line

Specifications

Typical Specifications

Final sizing depends on material properties, capacity and plant layout. Request a project review for a tailored proposal.

Type	Loss-in-weight (LIW) gravimetric feeder
Mode	Continuous set rate / batch refill
Discharge	Screw / vibratory / belt
Control	Load cell with PLC / HMI
Accuracy	Typically ±0.5 - 1% of set rate, application dependent
Construction	SS304 / SS316L contact options
Integration	Vacuum refill, mixer, extruder, packer

Materials

Suitable Materials

Powder and granule categories typically specified with a loss-in-weight feeder. Suitability is confirmed per project from bulk density, particle size, moisture and process conditions.

Chemical powders

pigments, resins, fine chemicals

Battery materials

cathode, anode, conductive carbon

Food powders

flour, starch, sugar, spices, additives

Plastics & additives

granules, masterbatch, compounds

Pharmaceutical solids

API, excipients, granulates

Not sure whether your material will convey? Send us a sample description and we will confirm before quotation.

Applications

Process Applications

Process points where this equipment is typically installed, from bulk intake through to packing.

Continuous additive micro and macro dosing

Extruder and mixer feed rate control

Battery and chemical powder metering

Food ingredient continuous dosing

Multi-feeder recipe lines

Pharmaceutical and nutraceutical dosing

Plastics and masterbatch feeding

Downloads

Catalogs & Datasheets

Technical documents related to this product and our powder handling range.

All downloads

Technical Datasheet

Loss-in-Weight Feeding System Datasheet

PDF · 165 KB

Download

Product Catalog

CYprocess Powder Handling Product Catalog (2026)

PDF · 3.5 MB

Download

FAQ

Loss-in-Weight Feeder FAQ

Common questions about selection, integration and quotation.

A volumetric feeder delivers a fixed volume per revolution, so output drifts whenever bulk density or flow behaviour changes. A loss-in-weight feeder measures the mass actually delivered and corrects the speed continuously, so the set rate is held regardless of those changes.

More FAQ