How much does a PET bottle washing line cost?

A complete PET bottle washing line costs between $30,000 and $150,000 depending on capacity (300-2000 kg/h), level of automation, and whether hot washing is included. Small lines (300-500 kg/h) start around $30,000-50,000, while fully automated 1000+ kg/h lines with hot wash systems range from $80,000-150,000.

What is the difference between cold wash and hot wash for PET recycling?

Cold wash uses ambient temperature water for rinsing and friction washing — suitable for relatively clean PET bottles. Hot wash heats water to 80-95°C with detergent to dissolve glue, labels, and organic residues — essential for producing food-grade PET flakes. Hot wash lines cost 30-50% more but produce flakes that sell for 40-60% higher prices.

How much water does a plastic washing line consume?

Without recycling, a 500 kg/h plastic washing line consumes 3-5 tons of water per hour. With a closed-loop water recycling system, consumption drops to 0.3-0.5 tons/hour — a 90% reduction. LVKESORT washing lines include water recycling as standard, significantly reducing operating costs and environmental impact.

Can one washing line process both PET and PP/PE?

While some equipment like shredders and crushers can be shared, PET and PP/PE require different process flows due to different densities (PET sinks, PP/PE floats). A dedicated PET line includes hot washing and label removal, while PP/PE lines focus on friction washing and film squeezing. For processing both, we recommend a modular system with shared front-end and separate washing sections.

Industry Guide

Complete Guide to Plastic Recycling: PET, PP & PE Washing Lines Explained

June 21, 2026 10 min read LVKESORT Engineering Team

Plastic waste recycling is a $40+ billion global industry growing at 5-7% annually. Whether you process PET bottles, PP/PE films, or woven bags, a well-designed washing line is the backbone of profitable recycling. This guide covers the three major plastic waste streams, their process flows, equipment selection, and financial returns.

1. Three Major Plastic Waste Streams

Not all plastic waste is the same. Each type requires different processing equipment and produces different end products. Understanding these differences is the first step to a profitable recycling operation.

PET Bottles (Polyethylene Terephthalate)

Water bottles, soda bottles, food containers. Density: 1.38 g/cm³ (sinks in water). Output: clean PET flakes for fiber, sheet, or food-grade pelletizing.

Market: Global PET recycling market $9.2B (2025), growing 7.2% CAGR. Clean PET flakes sell for $600-900/ton.

PP/PE Films & Bags (Polypropylene / Polyethylene)

Shopping bags, packaging films, agricultural films, shrink wrap. Density: 0.90-0.96 g/cm³ (floats in water). Output: clean PP/PE flakes or granules for re-pelletizing.

Market: PP/PE recycling market $7.5B (2025), growing 5.8% CAGR. Clean PE pellets sell for $500-750/ton.

Woven Bags & Jumbo Bags (PP Woven)

Cement bags, fertilizer bags, FIBCs, sand bags. High contamination with sand, cement, and dirt. Requires intensive washing. Output: recycled PP granules.

Market: Woven bag recycling is lower margin but high volume. Recycled PP granules sell for $450-650/ton.

2. PET Bottle Washing Line: Step-by-Step Process

PET bottle recycling is the most established and profitable plastic recycling stream. A complete washing line typically includes 8-12 processing stages:

Label Removal

A label remover strips paper and plastic labels from bottles before crushing. This prevents label contamination in the final flakes. Efficient label removal achieves 95%+ label separation rate.

Crushing

A PS Series crusher breaks whole bottles into 10-15mm flakes. The V-type roller design provides high-speed cutting with low energy consumption. Water injection during crushing provides initial rinsing.

Float-Sink Separation

PET flakes (density 1.38) sink while PP/PE caps and labels (density <1.0) float. This density-based separation is 98%+ effective and requires no chemicals — just water.

Hot Washing (Optional but Recommended)

Heated to 80-95°C with detergent, hot washing dissolves glue residues, removes organic contaminants, and produces food-grade PET flakes. Hot-washed flakes command 40-60% higher prices than cold-washed flakes.

Friction Washing

High-speed friction washer uses centrifugal force to scrub remaining dirt and labels from flake surfaces. This is the most effective cleaning stage for achieving low moisture and contamination levels.

Dehydration & Drying

A centrifugal dehydrator removes 80%+ moisture, followed by a screw dryer and thermal drying system to achieve final moisture content below 1%. Low moisture is critical for downstream pelletizing quality.

3. PP/PE Film Washing Line: Key Differences

Film recycling presents unique challenges compared to rigid PET: films are lightweight, easily tangled, and often heavily contaminated with sand, soil, and organic matter. The process requires specialized equipment:

PET vs PP/PE: Key Equipment Differences

Stage	PET Bottle Line	PP/PE Film Line
Size Reduction	Crusher (PS Series)	Pre-shredder + Crusher
Separation Method	Float-sink (PET sinks)	Float-sink (PP/PE floats)
Washing Focus	Hot wash + Friction wash	Friction wash + Rinsing tanks
Dehydration	Centrifugal + Screw dryer	Squeezer / Film compactor
Key Challenge	Glue & label residues	Tangling & sand contamination
Final Product	PET flakes (1% moisture)	PP/PE flakes or pellets (2-5% moisture)

For PP/PE film processing, the pre-shredder is essential — it cuts tangled film bales into manageable pieces before the crusher. Without pre-shredding, films wrap around crusher rotors and cause frequent jams. LVKESORT's YS Series pre-shredder handles bundled films, ton bags, and textiles efficiently.

The film squeezer (also called a compactor or agglomerator) is the final dehydration stage unique to film lines. It compresses washed film flakes under high friction and pressure, simultaneously removing moisture and densifying the material into semi-molten granules ready for pelletizing.

4. Washing Line Equipment Selection Guide

Component	Small (300-500 kg/h)	Medium (500-1000 kg/h)	Large (1000-2000 kg/h)
Shredder	D-600 Single Shaft	D-800 Single Shaft	D-1200 / SZ-1200
Crusher	PS-300	PS-500	PS-800
Washing Tanks	2 units	3-4 units	4-6 units
Friction Washer	1 unit	2 units	2-3 units
Dehydrator	Vertical	Horizontal	Horizontal (dual)
Dryer	Screw dryer	Screw + Thermal	Screw + Thermal
Water System	Basic recycling	Closed-loop (80% recycle)	Full closed-loop (90%+ recycle)
Total Power	80-120 kW	150-250 kW	300-450 kW
Est. Price Range	$30,000-50,000	$50,000-100,000	$100,000-200,000

Pro Tips from LVKESORT Engineers

Always oversize your shredder by 20-30% — it's the bottleneck of the whole line
Invest in a good friction washer — it does 60% of the actual cleaning work
For food-grade PET flakes, hot washing is non-negotiable
Water recycling pays for itself within 6-12 months through reduced water bills
Request PLC control for the complete line — it reduces labor from 5-6 workers to 2-3

5. Water Recycling: Reduce Consumption by 90%

Water is the largest operating cost in plastic washing — and the biggest environmental concern. A well-designed closed-loop water recycling system transforms your operation:

WITHOUT RECYCLING

3-5 t/h

Water consumption for 500 kg/h line

WITH LVKESORT RECYCLING

0.3-0.5 t/h

90% reduction in water consumption

LVKESORT's water recycling system includes: settling tanks for suspended solids, chemical dosing for flocculation, sand filters for fine particle removal, and buffer tanks for flow regulation. Treated water is recycled back to washing tanks, with only 10% fresh water makeup needed.

At average industrial water rates ($2-5/ton), a 500 kg/h line saves $150-400 per day in water costs with recycling — that's $45,000-120,000 per year. The recycling system typically pays for itself within 6-12 months.

6. ROI Analysis: Plastic Washing Line Economics

Sample ROI — 500 kg/h PET Bottle Washing Line

Daily throughput: 4,000 kg (8h)

PET flake yield: ~3,600 kg (90%)

PET flake price: $750/ton (cold wash)

Daily revenue: ~$2,700

Waste bottle cost: ~$0.15/kg

Daily raw material cost: ~$600

Operating cost: ~$500/day

Net daily profit: ~$1,600

Equipment investment: ~$50,000-80,000

Payback period: 12-18 months

*Based on 2026 average market prices. PET hot wash flakes ($1,000-1,200/ton) significantly improve returns.

Key profit drivers: securing low-cost waste bottle supply, producing food-grade hot-washed flakes, and maintaining high throughput with minimal downtime. LVKESORT's PLC-controlled lines achieve 95%+ uptime rates and are designed for continuous 24-hour operation.