HDPE Rigid Milk Bottle Recycling Washing Line

The SUHUI HDPE rigid milk bottle recycling washing line specializes in processing post-consumer high-density polyethylene (HDPE) dairy packaging waste into clean, high-purity flakes or pellets suitable for reuse in food-contact or industrial manufacturing applications.

Designed specifically for the challenges of dairy bottle recycling — including milk fat residues, foil labels, adhesive sleeves, and mixed caps — the line integrates heavy-duty shredding, multi-stage hot alkaline washing, friction scrubbing, float-sink separation, and thermal drying to achieve consistently clean output that meets food-grade and non-food recycled material standards.

Built for operational efficiency, the system incorporates closed-loop water recycling that reduces fresh water consumption by up to 70%, low-energy drying technology, and automated non-HDPE removal. Processing capacity scales from 300 to 2,500 kg/h to suit small and large recycling operations.

Key Features of SUHUI HDPE Milk Bottle Recycling Washing Line

• Heavy-Duty Shredding: Robust crushers reduce rigid HDPE milk bottles into uniform 10–15 mm flakes for consistent processing through all downstream washing stages.
• Label & Cap Removal System: Dedicated label separators and cap removal units detach PP/PE sleeve labels and residual caps before the main washing stages.
• Multi-Stage Hot Washing: Sequential pre-wash, hot alkaline wash (60–80°C), and chemical cleaning stages progressively eliminate milk fat residues, adhesives, and organic contaminants.
• High-Speed Friction Scrubbing: Mechanical friction washers polish flake surfaces to remove embedded contaminants and label adhesive residues for high-purity output.
• Float-Sink Separation: Water density separation tanks efficiently separate HDPE flakes (which float) from denser contaminants including PVC, PET, and metal fragments.
• Automated Non-HDPE Sorting: Pneumatic separators and optical sensors detect and remove non-HDPE materials throughout the line.
• Closed-Loop Water Recycling: Integrated water treatment and recirculation system reduces fresh water consumption by up to 70%, lowering operating costs and environmental impact.
• Thermal Drying: Low-energy hot air dryers reduce final flake moisture content to below 1%, meeting requirements for direct pelletizing or packaging.
• Food-Grade Compliance Option: Optional UV sterilization stage ensures output meets food-contact material standards for bottle-to-bottle or food packaging recycling applications.

HDPE Milk Bottle Recycling Washing Line Process

1. Pre-Sorting: Incoming dairy bottles are manually or automatically sorted to remove non-HDPE items including foreign plastics, metals, and heavily contaminated waste.
2. Label & Cap Removal: Sleeve labels and residual caps are mechanically separated from the bottles before shredding to reduce contamination in downstream stages.
3. Coarse Shredding: Whole HDPE milk bottles are shredded into 10–15 mm flakes using a heavy-duty crusher or granulator.
4. Pre-Washing: Shredded flakes are rinsed with ambient-temperature water to remove loose dirt, residual milk, and surface debris.
5. Hot Alkaline Washing: Flakes are immersed in a heated alkaline wash tank (60–80°C) that dissolves milk fats, oils, and organic residues from flake surfaces.
6. Friction Washing: High-speed mechanical friction scrubbers remove embedded contaminants and adhesive residues, polishing the flake surface for high optical clarity.
7. Float-Sink Separation: Flakes pass through water separation tanks where HDPE (density <1 g/cm³) floats and is separated from denser contaminants including PVC and metal fragments.
8. Rinsing & Centrifugal Dewatering: Clean HDPE flakes are thoroughly rinsed with fresh water, then spun in a centrifugal dewatering unit to remove surface water.
9. Thermal Drying: A hot air drying system reduces residual moisture to below 1%, producing dry, clean HDPE flakes ready for pelletizing or direct use.
10. Pelletizing & Packaging (Optional): Dried flakes can be fed directly into a pelletizing extruder to produce recycled HDPE pellets, or bagged and stored for sale as clean flake material.