PET Bottle Sorting Washing Line

The SUHUI PET bottle sorting washing line is engineered to recycle post-consumer PET bottles into high-purity flakes for use in food-grade packaging, polyester fiber, and textile applications. It integrates advanced automated sorting, multi-stage hot washing, and precision drying technologies to efficiently process mixed, contaminated PET bottle bales.

The system systematically eliminates all major contaminant types, including sleeve labels, PP/PE caps, adhesives, organic residues, non-PET plastics, ferrous and non-ferrous metals, PVC bottles, and glass, to produce clean PET flakes that meet FDA and EU food-contact recycled material standards. The washing line supports input capacities from 500 to 3,000 kg/h, making it suitable for small recycling facilities through to industrial-scale bottle-to-bottle recycling operations.

SUHUI’s closed-loop water recycling system minimizes fresh water consumption and wastewater output, while automated optical sorting at both the bottle and flake stages ensures high output purity and color segregation.

PET bottle sorting washing line workflow from bale breaking, sorting and washing to clean dried PET flake output.

Key Features of SUHUI PET Bottle Sorting Washing Line

• Dual-Stage Optical Sorting: Bottle-level optical sorting before crushing rejects non-PET bottles, including PVC and colored PET; flake-level optical sorting after drying separates clear, light blue, and green PET flakes for maximum output value.
• Eddy Current & Magnetic Metal Removal: A magnetic drum removes ferrous metals, while an eddy current separator removes non-ferrous metals such as aluminum caps and foil, protecting downstream equipment and improving flake purity.
• Label & Cap Removal System: Dedicated label removal crushers and friction washers mechanically detach sleeve labels and foil labels, reducing residual PP/PE cap fragments before washing.
• Dual Hot Washing Stages: Sequential high-speed hot washer and low-speed hot washer at 80–90°C with alkaline solution progressively dissolve adhesives, oils, and organic residues from flake surfaces.
• Float-Sink Separation: Water density separation tanks separate PET flakes, which sink, from lighter contaminants including PP/PE labels, caps, and film fragments.
• Zig-Zag Air Separator: After centrifugal dewatering, a zig-zag air separator removes residual light label fragments and film from PET flakes before optical sorting.
• High-Speed Centrifugal Dehydration: Centrifugal dryers reduce flake moisture content before the thermal drying stage, improving drying efficiency and reducing energy consumption.
• Thermal Drying System: Hot air drying reduces final moisture to below 1%, producing dry PET flakes ready for direct pelletizing, fiber spinning, or food-grade reprocessing.
• Food-Grade Compliance: System design and process parameters are built for recycled PET applications requiring FDA and EU food-contact material standards.
• Closed-Loop Water Recycling: Integrated water filtration and recirculation minimizes fresh water consumption and reduces wastewater discharge volume.
• Full Stainless Steel Construction: All material-contact components are manufactured from SUS304 stainless steel for corrosion resistance, hygiene compliance, and long service life.
• Certified to International Standards: CE, ISO9001:2008, QS, and GMP certified, meeting the compliance requirements of European and international buyers.

The PET bottle washing process targets sleeve labels, PP/PE caps, adhesives, metals, PVC, glass, and other non-PET contaminants through different removal stages.

PET Bottle Sorting Washing Line Technical Data

Exact configuration depends on feedstock contamination level, facility layout, and downstream application. Contact SUHUI for a customized technical proposal.

Standard PET bottle sorting washing line configurations support 500 to 3,000 kg/h input capacity with final moisture below 1% after thermal drying.

PET Bottle Sorting and Washing Process Workflow

1. Bale Breaking & Trommel Screening: PET bottle bales are broken open and fed through a trommel drum screen that removes small debris, dirt, and loose contaminants before the main sorting area.
2. Pre-Sorting & Metal Removal: Bottles pass over a magnetic drum to remove ferrous metals and through an eddy current separator to remove non-ferrous metals. Non-PET materials including glass, PVC bottles, and oversized contaminants are removed at the manual sorting station.
3. Bottle Optical Sorting: Whole bottles pass through a high-speed optical sorting machine that detects and ejects PVC bottles, non-PET plastics, and heavily colored bottles before crushing to reduce flake-level contamination.
4. Label Removal: Bottles pass through a high-speed label removal unit that mechanically strips sleeve labels and foil labels before shredding, preventing label adhesive contamination of flakes.
5. Crushing & Granulating: PET bottles are shredded and granulated into uniform 10–15 mm flakes using high-speed crushers.
6. Pre-Washing: Flakes are rinsed with ambient-temperature water in a pre-wash tank to remove loose dirt, dust, residual beverages, and surface debris.
7. Dual-Stage Hot Alkaline Washing: Flakes pass through a high-speed hot washer followed by a low-speed hot washer at 80–90°C with alkaline solution.
8. Friction Washing: High-speed friction scrubbers further polish flake surfaces, removing remaining embedded contaminants and label adhesive traces.
9. Float-Sink Separation: Flakes pass through multiple water separation tanks where PET sinks and is collected, while lighter PP/PE film and label fragments float and are skimmed off.
10. Rinsing & Centrifugal Dewatering: Clean PET flakes are thoroughly rinsed with fresh water to remove residual chemicals, then centrifugally dewatered to reduce surface moisture.
11. Zig-Zag Air Separation: After centrifugal dewatering, flakes pass through a zig-zag air separator that removes residual light label fragments and film pieces using an upward airflow column.
12. Flakes Optical Color Sorting: Dry flakes pass through optical sorting machines that separate clear, light blue, and green PET flakes into distinct output streams while ejecting remaining colored or opaque contaminants.
13. Thermal Drying & Packaging: A hot air drying system reduces final moisture to below 1%. Clean, sorted PET flakes are conveyed to storage silos or bagged for sale or downstream pelletizing.

Final line configuration should be matched to feedstock contamination, input capacity, bottle color mix, sorting requirement, washing intensity, and downstream application.

Clean PET Flake Output Applications

After sorting, washing, drying, and optical color separation, clean PET flakes can be used in food-grade packaging, polyester fiber, textile applications, and bottle-to-bottle recycling projects when the required downstream decontamination and quality standards are met.

Clean PET flakes can serve multiple downstream markets, including packaging, fiber, textiles, and bottle-to-bottle recycling projects.

Closed-Loop Water Recycling System

The PET bottle washing line integrates water filtration and recirculation across pre-washing, hot alkaline washing, friction washing, and rinsing. This helps reduce fresh water consumption and wastewater output while keeping the washing process stable for contaminated PET bottle feedstock.

Closed-loop water recycling reuses process water across the washing stages and reduces wastewater output.

Frequently Asked Questions

What types of PET waste can the SUHUI PET bottle sorting washing line process?

The line is designed to process post-consumer PET bottle bales containing mixed colors, sleeve labels, PP/PE caps, adhesive residues, organic contamination, and non-PET contaminants including PVC bottles, metal fragments, and glass. The sorting and washing system eliminates these contaminants through automated pre-sorting, mechanical label removal, multi-stage hot washing, and optical color sorting.

What output quality standards does the line meet?

The SUHUI PET bottle sorting washing line is designed to produce recycled PET flakes for applications that require FDA and EU food-contact recycled material standards. Multi-stage hot alkaline washing, friction scrubbing, optical sorting, and final moisture control below 1% support output flakes for packaging, polyester fiber, textile, and bottle-to-bottle applications.

How does the optical color sorting system work?

The line uses two independent optical sorting stages. The first sorts whole bottles before crushing to remove PVC bottles and non-PET plastics. The second sorts flakes after thermal drying, separating clear, light blue, and green PET flakes while ejecting remaining colored or opaque contaminants.

What input capacity options are available?

The PET bottle sorting washing line is available in four standard configurations: PET500 at 500 kg/h, PET1000 at 1,000 kg/h, PET2000 at 2,000 kg/h, and PET3000 at 3,000 kg/h. Required space ranges from 700 m² to 1,500 m², with installation power from 220 kW to 590 kW.

How does the line remove labels and PP/PE caps from PET bottles?

Bottles first pass through a high-speed label removal unit that mechanically strips sleeve and foil labels before shredding. After crushing, friction washers dislodge residual adhesive and cap fragments. Float-sink separation then separates PET flakes, which sink, from lighter PP/PE label and cap fragments, which float.

Does the washing line include a water recycling system?

Yes. The line integrates a closed-loop water filtration and recirculation system that treats and reuses process water throughout pre-washing, hot alkaline washing, friction washing, and rinsing. This minimizes fresh water consumption and reduces wastewater discharge volume.