Solids Loss-in-Weight-Feeder

Introduction

The Solid Loss-in-Weight Feeder is designed for continuous and accurate gravimetric feeding of solid materials in extrusion, compounding, and other continuous processing applications.

Available with single-screw or twin-screw feeding configurations, the system can be adapted to different material characteristics, from free-flowing pellets and granules to powders and other difficult-to-feed bulk solids.

Overview

The system continuously measures the weight change of the feeding unit and automatically adjusts the screw speed to maintain the preset mass flow rate.

A high-precision weighing system combined with closed-loop control of both weight and drive output provides stable and consistent feeding under changing operating conditions.

Single-screw feeders are primarily suited for free-flowing materials such as plastic pellets and granules, while twin-screw feeders provide improved feeding control for powders, fine materials, and materials with poor flowability or a tendency to bridge.

Modular construction allows the feeding section, hopper, screw assembly, and related components to be easily removed for cleaning, maintenance, or material changeover.

Technical Specifications

• Product Type: Solid loss-in-weight gravimetric feeder
• Feeding Configurations: Single-screw / Twin-screw
• Single-Screw Feeding Range: Approx. 2–3000 L/h
• Twin-Screw Feeding Range: Approx. 2–1800 L/h
• Feeding Accuracy: Up to approximately ±0.5%, depending on material and operating conditions
• Control Method: Gravimetric loss-in-weight closed-loop control
• Weighing System: High-precision load cell weighing
• Drive System: Servo motor drive, depending on model and configuration
• Hopper Design: Optimized hopper with optional agitation system
• Single-Screw Reference Capacity: Approx. 2–3000 kg/h, depending on model and material characteristics
• Twin-Screw Reference Capacity: Approx. 2–1000 kg/h, depending on model and material characteristics
• Control Interface: Touchscreen control system
• Communication: Modbus TCP/IP, Modbus RTU, PROFIBUS DP, PROFINET, Ethernet, and other optional industrial communication protocols
• Installation: Stand-alone installation or integrated into continuous processing lines
• Suitable Materials: Plastic pellets, granules, powders, fillers, additives, masterbatch, and other solid bulk materials

Note: Actual feeding capacity and accuracy depend on bulk density, particle size, flowability, screw configuration, hopper design, and process conditions. Screw type and feeding structure should be selected according to the specific material.

Key Features

• Gravimetric Loss-in-Weight Control – Continuously monitors material weight loss and automatically adjusts feeding output to maintain the preset feed rate.
• Single-Screw & Twin-Screw Configurations – Different screw configurations are available according to material flow characteristics and feeding requirements.
• High Feeding Accuracy – Closed-loop control of weighing and drive output provides feeding accuracy of up to approximately ±0.5% under suitable operating conditions.
• High-Precision Weighing System – High-performance load cells provide sensitive and stable weight measurement for continuous gravimetric control.
• Servo Drive System – Provides stable speed control and consistent torque output across a wide operating range.
• Anti-Bridging Hopper Design – Optimized hopper geometry helps improve material flow; agitation systems can be configured for difficult-flowing materials.
• Independent Agitation Option – Twin-screw configurations can be equipped with independently controlled agitation to improve feeding stability for powders and cohesive materials.
• Modular Construction – Feeding components can be easily disassembled for cleaning, maintenance, and rapid material changeover.
• Intelligent Control System – Supports automatic operation, parameter setting, process monitoring, and integration with production control systems.
• Industrial Communication – Optional communication interfaces support protocols such as Modbus TCP/IP, Modbus RTU, PROFIBUS DP, PROFINET, and Ethernet.

Applications

The Solid Loss-in-Weight Feeder is suitable for continuous gravimetric feeding and formulation control in applications including:

• Plastic compounding and pelletizing
• Engineering plastics modification
• Masterbatch production
• Cable compound production
• Biodegradable material processing
• Long-fiber reinforced thermoplastics (LFT)
• Powder and mineral filler feeding
• Additive and masterbatch dosing
• Extrusion production lines
• Multi-component continuous dosing systems

For pellets and free-flowing granular materials, a Single-Screw Loss-in-Weight Feeder is generally preferred for its simple structure and wide capacity range.

For powders, fine fillers, and materials with poor flowability, a Twin-Screw Loss-in-Weight Feeder is generally recommended to provide more stable material discharge and feeding consistency.

Interested in This Product?

If you’re interested in this product or have a specific application in mind, feel free to contact us. Share your material, process requirements, production capacity, and application details, and our team will recommend the most suitable configuration and technical solution to meet your production needs.
Our engineering team will recommend the most suitable solution.