1.Debaling Unit
The debaling system serves as the starting module of the PET bottle washing line. It is responsible for automatically breaking down compressed PET bottle bales and ensuring consistent feeding into downstream equipment. This is a critical unit for operations handling high-density bottle sources, helping maintain smooth and continuous production.
Key Features:
Dual-axis tilt design combined with twin powerful shredding shafts effectively breaks apart even ultra-high-density bottle bales without jamming.
Works in tandem with a chain plate conveyor for stable and regulated material feeding.
Energy-efficient operation, adaptable to varying bale densities across global markets.
Recommended Applications:
Ideal for high-capacity PET recycling lines dealing with tightly compressed bottle bales.
Suitable for facilities that require high production continuity and precise feeding rhythm.
Serves as the core front-end unit in fully automated feeding systems.
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2.Screening Unit
The trommel screening system acts as the first barrier against contaminants in the PET bottle washing line. It is specifically designed to remove large foreign particles such as sand, stones, glass, and metals that may be mixed into compressed PET bales. By doing so, it helps prevent damage or clogging in downstream crushing and washing machines, serving as a critical "filtration shield" that ensures the smooth operation of the entire production line.
Key Features:
Rotating drum design enables continuous tumbling and screening for high-efficiency contaminant removal.
Equipped with a dual collection system for separate recovery of stones, glass, and metals.
Significantly reduces impact from hard contaminants, extending the lifespan of critical components like crushers and washers.
Anti-blockage design specially reinforced for PET bales imported from regions with high impurity content.
Recommended Applications:
Ideal for processing PET bottles sourced from regions with complex contamination, such as Southeast Asia and South America.
Suitable for factories dealing with bottle bales bound with wire or mixed materials.
Best choice for operations looking to minimize crusher blade maintenance and maximize cleaning system uptime.
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3.Label Separation Unit
Shrink sleeve labels on PET bottles are one of the most challenging impurities to handle in a PET bottle recycling line. Boxin’s label removal system features a large-diameter cutting rotor with low-speed rotation, enabling high-efficiency label stripping without damaging the bottle body. This greatly enhances both the cleaning performance and purity of the final PET flakes.
Key Features:
Patented Rotor Design:
The large-diameter, low-speed blade rotor precisely cuts and separates shrink labels while avoiding cracks or damage to the bottle structure.
Integrated Label Collection System:
A built-in air-blown conveyor system collects stripped labels efficiently. Collected labels can be resold as a by-product, adding value to the process.
Optional Module:
If your PET feedstock consists of pre-cleaned bottles with no labels, this unit can be skipped as per production needs.
Recommended Applications:
Processing lines with a high ratio of shrink-labeled bottles, especially with PVC content.
Food-grade PET recycling operations where flake cleanliness is a top priority.
Enterprises aiming to improve flake color clarity and reduce impurity levels.
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4: Manual Sorting Unit
While optical sorting systems offer a high level of automation, manual sorting remains essential for catching what machines might miss. This module serves as a final quality control checkpoint before the crushing process. It works in conjunction with metal detection equipment and manual inspection platforms to remove any remaining off-color bottles, multilayer bottles, or metal contaminants that escape automated sorting.
Key Features:
Fills in Optical Sorting Blind Spots
Manual inspectors can identify subtle color variations, label residues, and foreign bottles that automated systems may overlook.
Integrated Metal Detection System
A fully automated flip-gate metal separator detects and removes bottles containing hidden metals in real time, preventing equipment damage and downstream contamination.
Ergonomic Steel Platform Design
The platform is built with worker safety and comfort in mind, making it easy to operate, clean, and maintain—suitable for high-throughput environments.
High-Capacity Buffer System
Helps stabilize feed flow in large-scale production lines by buffering incoming materials and compensating for supply fluctuations.
Recommended Applications:
Ideal for regions with lower labor costs or facilities that can allocate staff for manual re-sorting.
Used as a final inspection step to complement optical sorting systems.
Strongly recommended for food-grade or filament-grade recycling operations that demand maximum flake purity.
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5: Crushing Unit
The crushing unit is responsible for reducing whole PET bottles into uniform-sized flakes, preparing the material for deep cleaning. Boxin adopts a wet crushing method, where cleaning water is injected during the granulation process. This not only helps remove surface contaminants but also controls temperature and prevents dust and thermal sticking, easing the burden on downstream washing modules.
Key Features:
Wet Crushing with Integrated Cleaning
Water is injected during the crushing process to enable pre-cleaning, dust suppression, and anti-melting—resulting in cleaner, more stable PET flakes.
High Shear Efficiency Design
The cutting chamber uses a scientifically optimized combination of rotating and fixed blades, ensuring smooth, high-throughput cutting with minimal backflow or clogging.
Reinforced Main Shaft
Built with heat-treated alloy steel, the main shaft is engineered to withstand continuous heavy-duty operation without risk of fracture.
Sealed Cutting Chamber
Designed with a tight sealing structure to prevent material leakage and maintain a clean, safe working environment.
Long-Lasting Wear-Resistant Blades
Equipped with cryogenically treated D2 blades, capable of processing over 800 tons of PET material per set with consistent performance.
Noise Reduction by Design
Integrated soundproofing features reduce operational noise for a safer and more comfortable workplace.
Recommended Applications:
Essential unit in all PET washing lines.
Suitable for PET, HDPE, and PP recycling lines requiring flake size reduction.
Ideal for industrial users who prioritize dust control, blade durability, and low maintenance frequency.
Recommended for operations seeking to reduce energy consumption and minimize blade replacement cycles.
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6: Sink-Float Separation Unit
The sink-float separation unit operates based on the natural density differences among plastics like PET (~1.3g/cm³), PP, and HDPE. In water, PET sinks while PP/HDPE fragments—typically from caps and neck rings—float to the surface. This process enables the efficient physical separation of mixed plastics without the use of chemicals, ensuring an eco-friendly and stable operation.
Key Features:
Accurate Density-Based Separation
Utilizes a fully physical process without chemical additives, delivering environmentally sustainable and highly reliable separation performance.
Modular System Design
Scalable structure allows single-stage or multi-stage configuration based on production capacity, making it easy to adapt to varying processing needs.
Automatic Contaminant Discharge
Floating materials (PP/HDPE) are automatically collected and discharged, enhancing separation efficiency while minimizing manual handling.
By-Product Recovery
Separated PP and HDPE materials can be recycled or sold as secondary raw materials, increasing the marginal economic value of the recycling line.
Corrosion-Resistant Build
Key components are made from stainless steel or coated with anti-rust materials to withstand long-term wet operation conditions.
Recommended Applications:
For PET recycling operations requiring non-chemical separation of bottle fragments and labels.
Ideal for lines that process mixed bottle feedstock and seek to maximize yield and purity.
Suitable for facilities interested in secondary material recovery and value-added by-product management.
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7: Hot Washing Unit
The hot washing unit is one of the most critical deep-cleaning processes in a PET bottle recycling line. It is designed to remove stubborn contaminants from PET flakes, including grease, adhesives, label residues, and food particles. Boxin’s system utilizes a three-force synergy mechanism—thermal, chemical, and mechanical action—to achieve exceptionally high surface cleanliness standards.
The system supports both two-stage and three-stage tank combinations, with optional timed retention soaking in the second or third stage, ensuring thorough contaminant removal even from heavily soiled PET materials.
Key Features:
Eco-Friendly Alkaline Cleaning Agents
Uses specially formulated, non-toxic alkaline additives to dissolve grease and glue without harming the flakes or the environment.
High-Speed Agitation + Swirl Flow Design
Promotes vigorous flake tumbling and friction, accelerating impurity detachment for more efficient washing.
Flexible “1+2” or “2+1” Tank Configurations
Adaptable to varying contamination levels, with adjustable retention times to optimize cleaning performance.
Closed-Loop Filtration System
Allows filtered cleaning solution to be reused, reducing chemical consumption, water use, and operational costs.
Stable Output Quality
Enhances flake clarity and consistency, minimizing yellowing and surface defects for food-grade or high-end applications.
Optional Temperature Control and Auto-Dosing System
Supports constant temperature maintenance and automated chemical dosing for simplified operation and consistent results.
Recommended Applications:
Essential for bottle-to-bottle, food-grade, and filament-grade PET recycling operations.
Best suited for lines processing heavily contaminated or post-consumer PET feedstock.
Ideal for facilities prioritizing cost control, reliable cleaning results, and environmental sustainability.
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8: Continuous Rinsing & Friction Washing Unit
After hot washing, PET flakes may still carry alkaline residues and minor impurities. Boxin's three-stage physical purification system—combining friction washing, float rinsing, and 360° spray cleaning—ensures deep, multidimensional cleaning from every angle.
This unit employs multi-stage washing, controlled pH neutralization, and repetitive mechanical agitation to guarantee that no chemical residues remain on the PET flakes. The output meets the high standards required for direct pelletizing, fiber spinning, or bottle-grade applications.
Key Features:
Precise pH Neutralization
Multiple rinsing stages ensure the surface pH of flakes approaches neutral (pH ~7), preventing further oxidation or degradation during downstream processing.
Dual-Speed Friction Washing
Combines high-speed and low-speed friction zones to mechanically remove residual glue, alkali, and embedded dirt particles.
360° Spray Rinse System
Full-coverage spray nozzles deliver dead-zone-free washing, ensuring the highest level of flake surface purity.
Low Water Consumption
Integrated with Boxin’s closed-loop water recycling system, achieving over 50% water reuse rate to reduce operating costs and environmental impact.
Enhanced Clarity & Surface Quality
Efficient removal of visual contaminants significantly improves flake transparency, making the material suitable for clear packaging and premium-grade applications.
Recommended Applications:
Compatible with all PET bottle washing lines, especially those requiring high levels of purification.
Ideal for bottle-to-bottle, pelletizing, and fiber-grade recycling where strict pH control and surface cleanliness are essential.
Recommended for clients targeting high-value transparent applications or direct downstream production.
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