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I. The cleaning value of plastic pallets
In the global supply chain, the annual consumption of plastic pallets has exceeded 1 billion. Compared with wooden pallets, their corrosion resistance and easy cleaning properties make them account for up to 68% in industries with high hygiene standards such as food and medicine (according to the Global Logistics Packaging Market Report). But if cleaning management is ignored:
- Food safety risk: The probability of residues breeding pathogens such as Salmonella increases by 300%
- Economic loss: The premature scrapping rate of pallets caused by stain corrosion can reach 25%
- Compliance risks: FDA’s requirement for the number of colonies on the surface of food-grade pallets is ≤100 CFU/cm²
II. Strategic preparation before cleaning
1. Pallet status diagnosis
- Use an LED flashlight to check cracks (focus on load-bearing bars and support feet)
- Mark stubborn stain areas (yellow labels for oil stains and red labels for mold stains)
2. Tool selection
| Ordinary dust | High-pressure water gun (≤80 Bar) | Metal scraper |
| Food grease | Biological enzyme cleaner | Acetone solvents |
| Chemical residues | pH 7-8 Weak alkaline cleaners | Strong acids (pH<3) |
- Eyewash stations are required in the chemical operation area (within a radius of 15m)
- When using sodium hypochlorite for disinfection, air circulation must be ≥0.3m/s
III. Detailed explanation of the five cleaning technologies
1. Manual cleaning (food grade standard)
- Four-step process: pre-rinsing (40℃ water) → foam covering (neutral detergent) → scrubbing (nylon brush) → terminal disinfection (200ppm chlorine-containing solution)
- Efficiency parameters: 8-10 standard trays (1200×1000mm) can be processed per person per hour
2. Industrial cleaning with the high-pressure water gun
- Pressure gradient control:
Ordinary dirt: 50-80 Bar
Solidified grease: 120 Bar + 60℃ hot water - Water-saving design**: The circulating water system can reduce water consumption by 90%
3. Ultrasonic precision cleaning (medical grade)
- Parameter setting:
Frequency: 40kHz (removal of particles)
Temperature: 50℃ (activation of detergent)
Time: 8-12 minutes/batch - Verification standard: ATP bioluminescence detection value <50 RLU
4. Golden ratio of chemical disinfection
| Disinfectant type | Concentration range | Contact time | Rinsing requirements |
| Lsopropyl alcohol | 70% v/v | 3 minutes | No rinse required |
| Hydrogen peroxide | 3-6% | 10 minutes | Rinse 3 times with pure water |
| Quaternary ammonium compounds | 0.1-0.2% | 5 minutes | Rinse with normal water |
5. Automated cleaning line design
- Module configuration: pre-wash → main wash (spray pressure 0.3MPa) → rinse → hot air drying (70℃)
- Capacity benchmark: Chain conveyor system can reach 800 pallets/hour
IV. Industry customized solutions
1. Food processing industry
- Critical control points:
Weekly microbial testing (E. coli must not be detected)
Establish a cleaning record traceability system (retained for ≥2 years)
2. Pharmaceutical industry
- GMP compliance points:
- Use WFI (water for injection) for terminal rinse
- Cleaning validation must include API residue detection
3. Chemical logistics
- Material compatibility testing:
HDPE pallets must be resistant to chemicals with pH 2- 12
Impact strength retention rate after cleaning ≥95%
V. Full life cycle management strategy
1. Digital monitoring
- Implant an RFID chip to record the number of cleaning times (recommended ≤200 times/pallet)
- Use stress sensors to monitor structural deformation (threshold set to 85% of initial load)
2. Green maintenance technology
- Microbial cleaners (including Bacillus) decompose organic stains
- UV aging repair coating (spraying once a year extends the service life by 3 years)
3. Scrap judgment criteria
- Crack length > 50mm or depth > 2mm
- Flatness deviation > 10mm/m
VI. Benefit analysis
The implementation of scientific cleaning solutions can achieve:
- Reduced sanitation costs: 45% reduction in cross-contamination accidents
- Improved economic benefits: Extended service life of pallets from 5 years to 12 years
- Environmental value creation: 380 tons of water saved per thousand pallets per year
By establishing a closed-loop management system of cleaning-testing-maintenance, enterprises can not only meet the requirements of ISO 22000, GDP and other regulations, but also shape sustainable supply chain competitiveness.
