Melt Filtration Systems
Belt Screen Changers
Introduction
Belt Screen Changers are fully automatic continuous melt filtration systems designed for high-throughput polymer extrusion and recycling applications. Instead of replacing individual filter screens, these systems continuously advance filter belts to provide uninterrupted melt filtration with minimal operator intervention.
The series includes single-belt and double-belt configurations, delivering reliable filtration performance for applications ranging from conventional extrusion to heavily contaminated recycled materials.
Overview
Belt Screen Changers continuously remove contaminants from molten polymers by automatically advancing the filter belt during production. Unlike conventional screen changers, the filtration process continues without interrupting extrusion, allowing stable melt pressure and consistent product quality throughout long production runs.
The single-belt configuration provides an economical automatic filtration solution for standard production, while the double-belt design utilizes dual chambers and dual sealing technology to achieve higher filtration precision, greater production stability, and longer continuous operating cycles for demanding recycling applications.
Single-Belt Automatic Screen Changer
Key Features
- Continuous automatic screen belt feeding without stopping the extrusion line.
- Stable melt pressure with virtually no flow fluctuation during screen changing.
- Fully automatic filtration with no manual screen replacement required.
- Patented continuous belt filtration design for reliable long-term operation.
- High-strength Dutch weave filter belt with excellent pressure resistance.
- Suitable for continuous extrusion processes requiring stable product quality.
Double-Belt Automatic Screen Changer
Key Features
- Double-chamber design for fully automatic continuous melt filtration.
- Dual sealing system ensures stable melt pressure and reliable operation.
- Continuous filtration, screen feeding, and screen replacement without production interruption.
- Supports multi-layer filter belts for ultra-high filtration precision.
- Filtration precision up to 200 mesh or higher, depending on filter belt configuration.
- Low melt loss and reduced operating costs through efficient filtration.
- Designed for long-term continuous production in demanding recycling applications.
Technical Specifications
| Model | Type | Filter Area | Filter Belt Specification | Capacity | Heating Power | Max. Pressure |
|---|---|---|---|---|---|---|
| DHW-70 | Single-Belt | — | 10000 × 80 mm | ≤200 kg/h | 3.0 kW | ≤40 MPa |
| DHW-100 | Single-Belt | — | 10000 × 110 mm | ≤350 kg/h | 5.0 kW | ≤40 MPa |
| DHW-120 | Single-Belt | — | 10000 × 130 mm | ≤550 kg/h | 6.5 kW | ≤35 MPa |
| DHW-150 | Single-Belt | — | 10000 × 160 mm | ≤750 kg/h | 8.0 kW | ≤35 MPa |
| DHW-200 | Single-Belt | — | 10000 × 210 mm | ≤950 kg/h | 10.0 kW | ≤30 MPa |
| DHW-2-900 | Double-Belt | 900 cm² | 160 × 10/20/30/40 m | — | 35 kW | ≤30 MPa |
| DHW-2-1200 | Double-Belt | 1200 cm² | 210 × 10/20/30/40 m | — | 45 kW | ≤30 MPa |
Key Technologies
- Continuous automatic filter belt advancement
- Fully automatic non-stop screen changing
- Stable melt pressure throughout production
- Precision heating system for uniform melt temperature
- Optimized melt flow channels with low pressure loss
- Large filtration area for extended production cycles
- High-temperature sealing technology for reliable operation
- PLC automatic control with minimal operator intervention
- Multi-layer filter belt compatibility for higher filtration precision
- Dual-chamber and dual-sealing technology available on double-belt systems for maximum filtration performance.
Note
The Belt Screen Changer series includes two automatic filtration solutions for different production requirements:
- Single-Belt Automatic Screen Changer – Provides fully automatic continuous screen changing with a compact structure, making it suitable for standard extrusion and medium-capacity production lines requiring reliable automatic filtration.
- Double-Belt Automatic Screen Changer – Incorporates dual chambers and dual sealing technology to achieve uninterrupted filtration, higher filtration precision, support for multi-layer filter belts, and extremely low melt loss. It is particularly recommended for recycling applications processing heavily contaminated materials where maximum production continuity and filtration efficiency are required. The catalog indicates filtration precision up to 200 mesh or higher and melt loss below 0.5% under suitable operating conditions.
For conventional extrusion lines with moderate filtration requirements, Slide Plate Screen Changers or Piston Screen Changers provide cost-effective alternatives. Where screen replacement is undesirable and long-term automatic filtration is required, the Belt Screen Changer series offers the highest level of production automation within the screen changer product family.
Applications
Belt Screen Changers are designed for continuous filtration in demanding thermoplastic extrusion processes, including:
- Plastic Recycling
- Post-Consumer Plastic Recycling
- Post-Industrial Plastic Recycling
- Polymer Compounding
- Masterbatch Production
- Pelletizing
- Pipe Extrusion
- Sheet & Board Extrusion
- Film Extrusion
- Engineering Plastics Processing
Applicable polymers include:PE / PP / PS / ABS / PET / PA / PC / EVA / TPU / Other thermoplastic materials
Interested in This Product?
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