Pultrusion Automatic Metering & Dosing System

1. Overview

Built for continuous composite pultrusion lines, this system automates the supply of two-component thermosets including epoxy, polyurethane and phenolic resins. Metering, mixing and output happen online in one pass, so resin viscosity stays stable and ratios stay consistent — cutting manual mixing errors in volume production where batch-to-batch consistency is critical.

2. Material Storage

• Tanks: Two 60L stainless steel tanks (A and B) with double-wall bodies; heat-transfer oil circulates through the jacket to hold materials at constant temperature.

• Filling & Level: A fill port in the lid allows automatic refilling via pneumatic piston pump when level runs low. Teflon level sight tubes resist heat and resin build-up for a clear view; high/low level alarms optional.

• Mixing & Degassing: Both tanks have pneumatic stepless-speed agitators to prevent settling and even out temperature. A vacuum degassing port is provided for connection to a vacuum pump, with a gauge for live readout.

3. Metering

• Metering Pumps: High-precision corrosion-resistant gear pumps driven by servo motors for smooth, continuous delivery.

• Pressure Protection: A pressure sensor at the pump outlet monitors line pressure in real time; overpressure triggers an alarm and automatic stop, and the system restarts automatically once pressure returns to normal.

• Ratio & Flow: Injection ratio is customizable from 100:50 to 100:120, with standard flow of 3–5 g/s (customizable), both entered digitally on the touchscreen. Ratio and metering accuracy: consistency error ≤ ±1%.

4. Mixing

• Mixing Method: Extended static spiral mixer for thorough, even blending of A and B components.

• Mix Head: Combined valve-body design for easy disassembly and maintenance; mounted on an adjustable bracket for flexible positioning, with a control box on the bracket for convenient local operation.

5. Automatic Cleaning

The mix head comes standard with an automatic cleaning unit: cleaning fluid is stored in a tank and sprayed at high pressure as a mist. Duration, cycles and method are all set on the touchscreen, cutting downtime for maintenance.

6. Control System

Comprising an operator panel, PLC controller, touchscreen and electrical circuitry. PLC programming plus an intuitive touchscreen make it simple to operate, learn and maintain.

7. Advantages

• Continuous inline mixing keeps resin viscosity stable for higher profile quality

• Dual 60L temperature-controlled tanks plus vacuum degassing keep material condition under control

• Servo metering with ratio accuracy ≤ ±1% for excellent consistency

• Overpressure self-protection for safe operation; automatic cleaning for easy maintenance

• One-touch touchscreen setup for a friendly operator experience