Recycled Plastic Extruder Screen Changer

Define Production Requirements: Match Capacity and Process

Raw Material Characteristics

High-viscosity materials (e.g., PP, PE): Opt for a hydraulically driven dual-column screen changer with a plunger diameter ≥90mm to ensure sufficient thrust (≥25MPa) during screen changes and prevent jamming.

High Recycled Content (≥50%): Prioritize dual-column large-cartridge screen changers with wound-type screens. Their filtration area is 4 times larger than traditional flat screens, capturing micron-level impurities and reducing frequent screen changes.

Thermosensitive materials (e.g., PVC): Requires precise temperature control systems (±1°C) and low-shear flow channel design to prevent melt degradation.

Production Scale

Small-scale lines (<500 kg/h): Single-column screen changers offer high cost-effectiveness and compact structure, but require downtime during screen changes (approx. 5 minutes/change).

Medium-to-large production lines (500-2000 kg/h): Dual-column hydraulic changers are the mainstream choice, supporting non-stop screen changes in<3 seconds, with annual production increase potential reaching 10%-15%.

Ultra-large production lines (>2000 kg/h): Four-screen hydraulic changers enable alternating operation of four screens, providing over 2m2 of filtration area to meet continuous production demands.

Product Type

Strand pelletizing: Select equipment with screen change pressure fluctuations<5% to prevent strand breakage.

Cast Film: Prioritize dual-plate changers for minimal material flow pressure fluctuations, ensuring film thickness uniformity (±2μm).

High-Transparency Products: Four-screen cycle changers feature preheated filter plates and balanced transition design, minimizing fluctuations in material pressure, flow, and temperature during changes—ideal for optical-grade film production.

Manual Screen Changer: Low cost but requires manual operation, suitable for small pilot lines.

Hydraulic Screen Changer: Higher cost but offers high automation, reducing labor expenses over extended use.

Belt-Type Fully Automatic Screen Changer: Highest cost but eliminates manual screen changes, ideal for large-scale continuous production.

Highly Corrosive Environments

Optional high-corrosion-resistant materials (e.g., Hastelloy, titanium alloys) or surface coating technologies (e.g., PTFE coating) extend equipment lifespan.

Mobile Installation Requirements

Integrated mobile installation cart equipped with hydraulic station and electrical control system facilitates on-site maintenance and equipment relocation.

Automation Integration

Optional PLC control systems enable automatic alarms, pressure monitoring, temperature control, and interlocking with extruders, pelletizers, and other equipment.

Complete System Solutions

Integrate components like melt gear pumps, mixers, start-up valves, and underwater pelletizing dies to provide turnkey solutions, minimizing equipment compatibility issues.