Crystallization, drying and homogenization after PET granulation

Crystallization, drying and homogenization after PET granulation，crystallizer，Crystallization drying machine

以下为**PET造粒后结晶-干燥-均化系统**的专业英文技术说明，包含系统原理、技术优势及关键性能参数，适用于技术文档、设备手册或国际项目方案：

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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  

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#### **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

```

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#### **III. Performance Benchmark**  

| **Parameter**               | Conventional Process     | **Our System**           | Improvement |  

|-----------------------------|--------------------------|--------------------------|-------------|  

| **Crystallinity Uniformity**| 70-85% pellets达标       | **>98%达标**             | ↑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%        |  

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#### **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%  

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#### **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               |  

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#### **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)  

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> **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  

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**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*