· Rumtoo Engineering Team · Process Engineering · 1 min read
Inside a High-Efficiency PP/PE Film Washing Line
Process logic and key control points for improving cleanliness and reducing moisture in film recycling projects.
PP/PE film projects are often underestimated. Lightweight material behaves differently from rigid plastics across the entire line.
Typical process path
- Bale breaking and pre-shredding
- Friction washing and sink-float separation
- Multi-stage rinsing
- Mechanical dewatering + thermal drying
- Optional pelletizing
Why film lines lose efficiency
- wrapping and bridging in feed section
- unstable water circulation
- carry-over contamination between stages
- insufficient drying before extrusion
Key engineering controls
1) Feed stability
Use controlled feeding and anti-wrapping rotor logic to avoid surges.
2) Water management
Closed-loop water treatment reduces operating cost and improves process consistency.
3) Drying performance
A small moisture increase before extrusion can cause severe pellet quality fluctuations.
Recommended operating review
- track input contamination trend weekly
- log dewatering moisture by shift
- compare specific energy consumption per ton
- correlate pellet quality with upstream process changes
A film line becomes profitable when engineering discipline is maintained after commissioning, not only during startup.
