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Crystallization, drying and homogenization after PET granulation
Crystallization, drying and homogenization after PET granulation，crystallizer，Crystallization drying machine
以下為**PET造粒后結(jié)晶-干燥-均化系統(tǒng)**的專(zhuān)業(yè)英文技術(shù)說(shuō)明，包含系統(tǒng)原理、技術(shù)優(yōu)勢(shì)及關(guān)鍵性能參數(shù)，適用于技術(shù)文檔、設(shè)備手冊(cè)或國(guó)際項(xiàng)目方案：
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### **Crystallization, Drying and Homogenization System for Post-Granulation PET Pellets**
*Precision Engineered for Bottle-Grade/Fiber-Grade PET Excellence*
#### **I. System Mission**
Resolve three critical defects in virgin/recycled PET pellets:
- **Low/Non-Uniform Crystallinity** (<5%) → Caking in silos, blocking extruders
- **Moisture Fluctuation** (200-800ppm) → IV drop >0.05 dl/g, hydrolysis-induced brittleness
- **Broad Molecular Weight Distribution** (PDI>2.5) → Spinning breaks ↑30%, optical defects
---
#### **II. Process Flow & Core Technology**
```mermaid
graph TD
A[Amorphous PET Pellets] --> B(Crystallization Tower)
B --> C{Drying System}
C --> D(Homogenization Silo)
D --> E[Premium PET Output]
subgraph B: Crystallization
B1["3D Pulsed Fluid Bed"] -->|Prevents agglomeration| B2
B2["Gradient Temp Control (120℃→180℃)"] -->|Crystallinity >40%| B3
B3["Online DSC Monitoring"] -->|Real-time adjustment| B1
end
subgraph C: Drying
C1["-50℃Dew Point Rotor"] -->|Deep dehumidification| C2
C2["Closed-Loop Dry Air @160℃"] -->|Moisture ≤25ppm| C3
C3["NIR Moisture Analyzer"] -->|Feedback control| C1
end
subgraph D: Homogenization
D1["Pneumatic Vortex Mixing"] -->|20 cycles/hour| D2
D2["IV Value Online Sensor"] -->|Control PDI<1.8| D3
D3["Residence Time Optimization"] -->|Narrow MWD| D1
end
```
---
#### **III. Performance Benchmark**
| **Parameter** | Conventional Process | **Our System** | Improvement |
|-----------------------------|--------------------------|--------------------------|-------------|
| **Crystallinity Uniformity**| 70-85% pellets達(dá)標(biāo) | **>98%達(dá)標(biāo)** | ↑28% |
| **Moisture Stability** | ±50ppm | **±15ppm** | ↑70% |
| **IV Fluctuation** | ±0.04 dl/g | **±0.01 dl/g** | ↓75% |
| **Energy Consumption** | >130 kW·h/ton | **≤85 kW·h/ton** | ↓35% |
| **PDI (Mw/Mn)** | 2.2-2.8 | **1.6-1.8** | ↓32% |
---
#### **IV. Technical Innovations**
- **Anti-Caking Crystallization**
- 3D pulsed airflow breaks pellet clusters
- Crystal growth rate controlled within 5%/min
- **Zero-Hydrolysis Drying**
- Dual-stage desiccant rotor with Ti-Si molecular sieve
- Moisture regain <0.005% after 24h exposure
- **Molecular-Level Homogenization**
- IV feedback to adjust mixing intensity
- Residence time distribution (RTD) CV <5%
---
#### **V. Application-Specific Advantages**
| **End-Use** | **Critical Benefit** | **Performance Data** |
|------------------------|---------------------------------------------|----------------------------------|
| **Food-Grade rPET** | Meets FDA/EFSA migration limits | Acetaldehyde ≤1.2 ppm |
| **Ultra-Fine Fibers** | Enables ≤0.2 dtex spinning | Break rate ↓ from 8%→0.9% |
| **Optical-Grade Bottles**| Haze ≤0.8% (vs. 3-5% standard) | L* color value >92 |
---
#### **VI. Operational Efficiency**
- **Modular Design**: Capacity 0.5-12 TPH
- **Autonomous Control**:
- AI predicts crystallization kinetics
- Self-optimizes drying temperature/dew point
- **Maintenance Advantage**:
- Dust-free rotor regeneration
> **Downtime**: <8 h/year vs. >40 h (conventional)
---
> **Case: Global Top3 rPET Producer**
> - **Throughput**: 8 TPH continuous operation
> - **Quality**: IV consistency ±0.007 dl/g (98.2% uptime)
> - **ROI**: Saved $1.2M/year in scrap reduction
---
**Conclusion**
This integrated system transforms *brittle, inconsistent PET pellets* into **premium-grade materials** through:
1. **Controlled Crystallization** → Eliminates thermal degradation
2. **Deep Dehydration** → Halts hydrolysis at molecular level
3. **Dynamic Homogenization** → Unlocks fiber/bottle applications
Where PET excellence demands perfection, this system delivers the **triple guarantee of uniformity, stability, and process efficiency.**
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*Technical Tags: PET Crystallization Control | Low-Dew Point Drying | IV Homogenization | rPET Upgrading*
