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Opening, Sorting, and Pre-Wash
Debaling, pre-sorting, or wet crushing remove loose dirt and stabilize material flow before more aggressive cleaning stages begin.
Plastic Washing Lines
Integrated Washing Systems for PET, Film, and Rigid Plastics
Build the washing line around the material instead of forcing every feedstock through the same process. Rumtoo configures pre-wash, hot wash, friction washing, sink-float separation, dewatering, and water treatment according to contamination load, target purity, and downstream reuse.
Washing Line Workflow
The correct sequence depends on resin family, contamination profile, and final output requirement.
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Friction Washing + Optional Hot Wash
Friction washers scrub labels, paper, mud, and fines. Hot wash is added when the material carries glue, oils, food residue, or stubborn contamination.
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Sink-Float and Purification
Density separation removes heavy or incompatible plastics, while repeated rinse and air separation stages improve the purity baseline before drying.
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Dewatering, Drying, and Discharge
Centrifugal drying, thermal drying, or screw squeezing are matched to PET flakes, film, or rigid regrind so the output is ready for packing or pelletizing.
Why Integrated Washing Performs Better
Material-Specific Process Design
PET bottle flakes, soft film, and rigid HDPE/PP do not need the same washing sequence. Rumtoo matches modules to the actual contamination profile.
Cleaner Output for Downstream Reuse
Stable contamination removal improves extrusion, pelletizing, and flake resale by reducing glue, fines, labels, oils, and heavy polymer carryover.
Utilities Planned Up Front
Water recirculation, hot wash heating, sludge handling, and footprint are considered during design instead of becoming a commissioning problem later.
Common Washing Line Problems and Fixes
Problem
Rumtoo Solution
One generic line is expected to wash PET, film, and rigid plastics equally well.
Rumtoo separates the process logic by material family so hot wash, sink-float, drying, and water handling are selected for the actual feedstock.
Problem
Rumtoo Solution
Glue, oils, or food residue remain after cold washing only.
Hot wash, residence time, and chemical dosing are introduced where difficult contamination cannot be removed with friction alone.
Problem
Rumtoo Solution
Water consumption and sludge load become too high after startup.
Recirculation, settling, and filtration modules are sized with the washing stages so utility cost and wastewater load remain practical.
Problem
Rumtoo Solution
Output still carries labels, caps, paper, or fines into drying and pelletizing.
Repeated density separation, friction cleaning, and air classification improve purity before the material reaches final drying and extrusion.
Machine and Process Reference
Core modules that usually decide purity, moisture, and downstream stability.
Complete Washing Line Layout View
Layout planning matters because tanks, dryers, water treatment, access platforms, and transfer points define how easy the line is to run and maintain.
- Useful for evaluating footprint and operator access
- Helps plan tank orientation and downstream handoff
- Shows how washing and water-treatment sections are organized
Sink-Float Separation as a Purity Control Stage
Sink-float separation is one of the most important modules in PET and rigid plastic washing when density-based separation determines the final purity baseline.
- Removes floating caps, labels, and light polymers from target flakes
- Supports more stable output before drying and air separation
- Often paired with friction washing and repeated rinsing stages
Typical Feedstocks and Project Types
PET Bottle Recycling
Post-consumer bottle bales requiring label removal, hot washing, sink-float separation, and low final moisture.
PE / PP Film Washing
Agricultural film, shopping bags, stretch film, and printed packaging needing friction washing and stronger drying strategy.
Rigid HDPE / PP Regrind
Milk bottles, detergent containers, crates, and hard plastics where hot wash may be needed for glue, oil, or odor control.
Woven Bags and Raffia
PP woven packaging with strong fibers, print load, and contamination that need more careful washing and discharge handling.
Mixed Post-Consumer Streams
Municipal or commercial feedstock where contamination level drives the need for more sorting, washing depth, and water treatment.
Retrofit and Capacity Upgrade Projects
Plants adding hot wash, sink-float separation, drying, or water recirculation to improve output quality without rebuilding everything.
Reference Configurations
| Line Family | Typical Throughput | Output Condition | Typical Utility / Layout Note |
|---|---|---|---|
| PET Bottle Line | 500-3000 kg/h | < 1% moisture, high-purity flakes | Hot wash, friction wash, and water treatment usually required |
| Film Washing Line | 300-2000 kg/h | < 3-5% moisture after matched drying | Squeezer or stronger dewatering often needed for pelletizing |
| Rigid Plastic Line | 500-3000 kg/h | Clean washed flakes for extrusion | Hot wash depends on glue, oil, odor, and application target |
| 1000 kg/h PET Reference | Around 1000 kg/h | Bottle-grade washed flake route | Roughly 400-750 m² depending on modules and utility area |
| Water System | Project-specific | Recirculated where possible | Fresh water and sludge load depend on contamination and treatment design |
Reference values vary by feedstock condition, purity target, hot wash requirement, and water-treatment scope. Final sizing is based on project data rather than a single standard line.
Washing Line Checklist Before RFQ
These inputs determine whether the line needs hot washing, deeper separation, or more aggressive drying.
Material Family
Specify PET bottles, PE/PP film, rigid HDPE/PP, woven bags, or mixed streams. The process route changes significantly by resin family.
Contamination Type
Describe labels, glue, food residue, oil, sand, stones, organics, and heavy polymer contamination such as PVC or PET carryover.
Output Target
Clarify whether you need washed flakes, low-moisture film feed, or a pelletizing-ready output with a specific purity or moisture requirement.
Utilities and Footprint
Provide power, water, steam or electric heating availability, wastewater plan, and usable floor space for tanks, dryers, and maintenance access.
System-Level Comparison
| Decision Criteria | Basic Wash Line | Rumtoo Integrated System |
|---|---|---|
| Material Matching | Same logic used for all plastics | Modules selected by resin family and contamination |
| Hot Wash Decision | Added late or omitted blindly | Included only when glue, oil, or residue justify it |
| Water Management | Often treated as an afterthought | Recirculation and sludge handling designed into the line |
| Downstream Readiness | Variable discharge moisture and purity | Output prepared for drying, storage, or pelletizing |
| Expansion Planning | Hard to retrofit later | Modular layout supports staged upgrades and line additions |
Frequently Asked Questions
Can one washing line process PET, film, and rigid plastics together?
A hybrid configuration is possible in some cases, but best performance usually comes from process logic tuned to each material family. PET, soft film, and rigid plastics have different contamination patterns and drying requirements.
When is hot washing necessary?
Hot washing is usually selected when the feed carries glue, oil, food residue, or stubborn contamination that cold friction washing cannot remove reliably. Many PET projects need it; many film projects do not.
How much water does a plastic washing line use?
That depends on contamination level and the water treatment loop. With recirculation, many projects aim to keep fresh-water demand relatively low, but the final number must be sized around your material and sludge load.
What data should I send before quotation?
Send feedstock photos, material type, contamination description, required kg/h, output target, and utility constraints. That is the minimum information needed for practical line sizing and layout planning.
Need a Washing Line Proposal?
Share your material, contamination level, target purity, and utility conditions. Rumtoo will return a practical process route with key modules and planning notes.
Request Washing Line Proposal