Buyer's Guides April 6, 2026 SUHUI Machinery

Plastic Film Recycling Line: How It Works, Key Stages and Equipment

Each year, hundreds of millions of tonnes of plastic film waste are generated from agricultural operations, packaging facilities, and industrial production. Without an efficient processing system, this material either ends up in landfill or is exported at low value. A plastic film recycling line offers a direct solution — converting contaminated film waste into clean, reusable flakes ready for pelletizing or sale.

This guide covers everything you need to know: how the process works, what each stage does, which equipment is involved, and how to select the right system for your operation.

What Is a Plastic Film Recycling Line?

A plastic film recycling line is a series of interconnected machines designed to clean, separate, and dry post-consumer or post-industrial plastic film waste into high-purity flakes. These flakes are typically used as feedstock for downstream pelletizing, film blowing, or injection molding.

The most common materials processed include:

PP film — woven bags, bulk bags (FIBCs), strapping
PE film — stretch wrap, shrink film, greenhouse covers, agricultural mulch film
LDPE film — packaging film, bread bags, bubble wrap
Mixed soft plastics — post-consumer film bales from sorting facilities

Because film plastics are lightweight, flexible, and often heavily contaminated with soil, labels, moisture, and chemical residues, standard rigid plastic recycling equipment is not suitable. A dedicated film washing line uses high-friction scrubbing, density separation, and thermal drying specifically engineered for soft, low-density materials.

How a Plastic Film Recycling Line Works: Step-by-Step Process

A complete plastic film recycling line typically includes 7 to 10 processing stages, depending on the contamination level and required output purity.

Stage 1 — Pre-Sorting and Bale Breaking

Incoming film bales are opened and fed onto a sorting conveyor. Non-plastic contaminants — including metals, glass, textiles, and oversized rigid plastics — are removed manually or through automated detection. This stage protects downstream equipment from damage and reduces processing load.

Stage 2 — Shredding or Crushing

Film material is fed into a specialized granulator or film crusher, which cuts it into uniform flakes of 10–20 mm. This smaller output size — compared to standard shredders — maximizes washing surface area and ensures consistent feeding into downstream washing tanks. Wet crushing with water injection during size reduction begins loosening surface dirt immediately, shortening overall washing time.

Stage 3 — Pre-Washing (Coarse Washing)

Shredded film enters a pre-wash tank where high-volume water flow and agitation remove the majority of loose soil, sand, dust, and organic debris. This stage acts as the first decontamination pass, extending the service life of friction washers in later stages.

Stage 4 — Friction Washing

Film flakes pass through one or more high-speed friction washers. Rotating paddles drive flakes against the inner wall of a perforated drum, generating intense mechanical scrubbing action that removes embedded dirt, label adhesive, and surface films. Friction washing is the most critical cleaning stage for post-consumer agricultural film contaminated with soil and pesticide residues.

Stage 5 — Float-Sink Separation

A density separation tank uses water buoyancy to separate materials by density. PP and PE film float and are collected at the surface, while heavier contaminants — sand, metal particles, PVC fragments, and other dense materials — sink to the bottom and are discharged. This step is essential for removing contaminants that friction washing cannot dislodge.

Stage 6 — Hot Washing (Optional but Recommended)

For film containing adhesives, oils, grease, or chemical residues, a hot alkaline wash tank operating at 60–80°C effectively dissolves stubborn contamination that cold washing cannot remove. This stage is strongly recommended for post-consumer film and agricultural mulch film, where surface contamination levels are highest.

Stage 7 — Clean Rinsing

After friction washing and optional hot washing, film flakes are rinsed with clean water to remove residual detergent, alkali solution, and loose fine particles. A final rinse ensures the output flakes meet quality standards for downstream pelletizing.

Stage 8 — Mechanical Dewatering

A two-step mechanical dewatering system — centrifugal dryer followed by screw press — removes the majority of surface moisture, bringing flake moisture content down to below 12% before the thermal drying stage. This combined approach significantly reduces the thermal energy load in the next stage.

Stage 9 — Thermal Drying

Hot air drying reduces final moisture content to below 5%, producing dry film flakes suitable for direct pelletizing or bagging. Thermal dryers use an insulated drying chamber with temperature-controlled air circulation to evaporate residual moisture without degrading the polymer.

Stage 10 — Output, Storage and Pelletizing

Clean, dry film flakes are conveyed to storage silos or bagged for sale. Alternatively, they can be fed directly into a connected pelletizing line to produce recycled PP or PE pellets for sale to manufacturers.

PP PE Film Washing Line in Operation

The following video shows a complete SUHUI PP PE film recycling washing line running at full capacity, demonstrating the full washing sequence from shredding and friction washing through to mechanical drying:

Key Equipment in a Plastic Film Recycling Line

Equipment	Function	Notes
Bale Breaker / Belt Conveyor	Feed and separate baled material	Required for compressed bale input
Film Granulator / Crusher	Size reduction to 10–20 mm	Specialized granulator prevents tangling; smaller flakes maximise washing area
Pre-Wash Tank	Remove loose soil and coarse debris	First cleaning pass
Friction Washer	Mechanical scrubbing to remove embedded contamination	Most critical cleaning stage
Float-Sink Separation Tank	Density-based separation of PP/PE from contaminants	Essential for mixed-material streams
Hot Wash Tank	Dissolves adhesives, oils and chemical residues	Recommended for agricultural and post-consumer film
Centrifugal Dryer + Screw Press	Mechanical dewatering reduces moisture to below 12%	Two-stage mechanical removal reduces thermal energy load
Thermal Dryer	Final hot-air drying to below 5% moisture	Required before pelletizing or direct packaging
Pelletizing Line	Converts clean flakes to recycled pellets	Optional, connected downstream

Types of Film Plastics a Recycling Line Can Process

Film recycling lines can be configured for specific material streams or designed to handle a broad range of film types. SUHUI Machinery’s plastic recycling washing line range covers all major film types with dedicated machine configurations:

Agricultural Film (Highest Contamination)

Greenhouse covers and mulch film carry heavy loads of soil, sand, fertilizer residues, and moisture. Processing requires multi-stage friction washing, extended hot washing, and high-capacity dewatering. Output is typically recycled PE or PP pellets.

PP Woven Bags and FIBCs

Polypropylene bulk bags and jumbo bags are thicker and more rigid than thin film but still require washing to remove bulk material residues (cement, fertilizer, chemicals). A dedicated PP jumbo bag recycling washing line typically uses a modified shredding configuration with higher-torque equipment.

PE Packaging Film and Stretch Wrap

Post-industrial PE stretch wrap and packaging film is generally lower contamination than agricultural film and often yields higher-quality output flakes. These materials respond well to standard friction washing without hot washing.

Mixed Post-Consumer Film Bales

Mixed bales sourced from material recovery facilities (MRFs) require more robust sorting and density separation to handle the wide variety of polymer types and contamination profiles.

How to Choose a Plastic Film Recycling Line

The four variables below determine the right system configuration. For a full purchasing decision framework — including questions to ask manufacturers and a complete specification checklist — see our detailed guide: How to Choose a Plastic Film Washing Line: A Complete Buyer’s Guide →

1. Input Material Type and Contamination Level

Agricultural film and post-consumer film require more intensive washing stages (multi-stage friction, hot washing) than clean post-industrial film. Define your primary feedstock before specifying equipment.

2. Required Processing Capacity

Film recycling washing lines are available across a range of capacity configurations to suit different operation sizes. Do not over-size — calculate your realistic daily input volume first and select a model rated for approximately 80% of that figure to allow buffer and maintenance windows. Contact SUHUI Machinery to discuss the right capacity configuration for your feedstock volume and facility.

3. Output Quality Requirements

If output flakes will be used for food-contact applications or high-grade fiber production, additional purification stages (optical sorting, extended hot washing) are required. For standard pelletizing, basic friction washing and dewatering is sufficient.

4. Water Recycling System

A closed-loop water filtration and recirculation system is essential for reducing freshwater consumption and wastewater discharge. SUHUI Machinery’s PP PE soft film washing line integrates a closed-loop water treatment system that continuously filters and recirculates process water throughout all washing stages, minimising fresh water consumption and supporting environmental compliance.

Conclusion

A plastic film recycling line is an engineered system purpose-built for the challenges of film plastic recycling — flexible materials, low density, and high contamination loads that standard rigid plastic equipment cannot handle efficiently. By combining mechanical shredding, multi-stage friction washing, density separation, squeezing, and thermal drying, modern film recycling lines can produce high-purity output flakes suitable for pelletizing, film blowing, and a wide range of downstream manufacturing applications.

If you are evaluating a film recycling system for your operation, the most important first step is a clear assessment of your input material: the film type, contamination level, and daily input volume will determine everything from equipment selection to system capacity.

SUHUI Machinery designs and manufactures complete plastic film recycling washing lines for plastic recyclers and processors worldwide. Explore the PP PE Soft Film Recycling Washing Line — engineered for post-consumer and post-industrial PP and PE film waste, with a fully integrated closed-loop water recycling system. View product details →

Frequently Asked Questions

What types of plastic film can be processed on a film recycling line?

A plastic film recycling line is designed to process PP film (woven bags, FIBCs, strapping), PE film (stretch wrap, packaging film, greenhouse covers, agricultural mulch film), LDPE film (bubble wrap, bread bags), and mixed post-consumer film bales. The specific configuration of washing stages depends on the contamination level of the input material.

What is the difference between a film recycling line and a rigid plastic recycling line?

Film plastics are lightweight, flexible, and tend to retain large volumes of surface water and embedded contamination. Rigid plastic recycling lines use granulators and standard washers designed for thicker material. Film recycling lines use wet crushers, high-speed friction washers, float-sink tanks, and film squeezers specifically engineered for soft, low-density materials that would jam or degrade in rigid plastic equipment.

What output moisture content can a film recycling line achieve?

A two-stage drying process is used: mechanical dewatering (centrifugal dryer + screw press) first reduces moisture to below 12%, followed by a hot air thermal drying system that brings final residual moisture to below 5%. This level is suitable for direct pelletizing, extrusion, or packaging without further drying.

How much does a plastic film recycling line cost?

Pricing depends on processing capacity, contamination level of your input material, degree of automation, and which stages are included (basic washing only vs. full hot washing, water recycling system, and integrated pelletizing). Because configurations vary significantly between operations, there is no single list price. Contact SUHUI Machinery for a detailed quotation based on your specific material, capacity, and output requirements.

How much space does a plastic film recycling line require?

Space requirements scale with capacity. As a reference, typical configurations require approximately: 42m × 15m for a 500 kg/h line, 50m × 15m for 1,000 kg/h, and 80m × 30m for a 2,000 kg/h line. These figures cover the washing line only; a connected pelletizing line requires additional space downstream. Layout options (linear, L-shaped, or U-shaped) can be adapted to your facility footprint. Contact SUHUI Machinery to discuss layout planning for your site.