---
title: "Twin Screw Assembly"
industry: "Rubber and Plastic Product Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:TWIN_SCREW_ASSEMBLY"
  data_integrity_hash: "b7ea0e2a8ad3fd41db6563a5b076bed0"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:TWIN_SCREW_ASSEMBLY"
  data_source_uri: "https://cnfx.com/llms/industry/rubber-and-plastic-product-manufacturing/product/twin-screw-assembly.md"
  official_resource_url: "https://cnfx.com/industry/rubber-and-plastic-product-manufacturing/product/twin-screw-assembly"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.5-15 MPa (5-150 bar) at 50-300 RPM with 0.1-0.3 mm radial clearance"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 250
    unit: "MPa"
    consequence: "High-cycle fatigue from alternating torsional loads (Goodman diagram), adhesive wear from polymer-metal interaction (Archard's law), and thermal degradation exceeding Arrhenius kinetics at polymer interface"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Polymer degradation products forming acidic compounds (e.g., HCl from PVC decomposition)"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Nitriding surface treatment to 800-1200 HV hardness with 0.1-0.3 mm case depth"
  - node_2:
      trigger: "Non-uniform barrel heating creating 50-100°C axial temperature gradient"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Internal oil circulation at 80-120°C with PID-controlled zone heating maintaining ±5°C axial uniformity"
bom_nodes:
  screw-shaft:
    type: "component"
    urn: "URN:CNFX:ME:SCREW_SHAFT"
    interface_type: "physical-logic-coupled"
  conveying-screw-elements:
    type: "component"
    urn: "URN:CNFX:ME:CONVEYING_SCREW_ELEMENTS"
    interface_type: "physical-logic-coupled"
  kneading-blocks-mixing-elements:
    type: "component"
    urn: "URN:CNFX:ME:KNEADING_BLOCKS_MIXING_ELEMENTS"
    interface_type: "physical-logic-coupled"
  reverse-flight-elements:
    type: "component"
    urn: "URN:CNFX:ME:REVERSE_FLIGHT_ELEMENTS"
    interface_type: "physical-logic-coupled"
  screw-end-tip:
    type: "component"
    urn: "URN:CNFX:ME:SCREW_END_TIP"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 9001:2015 (QUALITY MANAGEMENT SYSTEMS)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/rubber-and-plastic-product-manufacturing/product/twin-screw-assembly.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "4e7c7d5a14f4e5486a532d63f3c0eb028ee2ebaf47187e60721d4d1d8735b105"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Twin Screw Assembly

## 1. Technical Definition
The core rotating element in a twin-screw extruder that conveys, mixes, and processes polymer materials.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.5-15 MPa (5-150 bar) at 50-300 RPM with 0.1-0.3 mm radial clearance**. Failure boundary: **Shear stress exceeding 250 MPa at screw root, temperature exceeding 350°C at polymer interface, or radial deflection exceeding 0.5 mm**, Mechanism: **High-cycle fatigue from alternating torsional loads (Goodman diagram), adhesive wear from polymer-metal interaction (Archard's law), and thermal degradation exceeding Arrhenius kinetics at polymer interface**.

### 2.1 Analytical Physics Model
Governed by the **L10 Bearing Life & Fatigue Model**:

> **Primary Equation**: $L_{10} = (\frac{C}{P})^p$  
> **Engineering Impact**: Predicts mechanical lifecycle before component fatigue.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| C | Dynamic Load Rating | Engineering Constant |
| P | Equivalent Dynamic Load | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Polymer degradation products forming acidic compounds (e.g., HCl from PVC decomposition) | 8 | Corrosion pitting at screw root reducing fatigue strength by 40% | Nitriding surface treatment to 800-1200 HV hardness with 0.1-0.3 mm case depth |
| Non-uniform barrel heating creating 50-100°C axial temperature gradient | 8 | Thermal bowing causing 0.3-0.8 mm eccentricity and premature bearing failure | Internal oil circulation at 80-120°C with PID-controlled zone heating maintaining ±5°C axial uniformity |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | mm | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Gravimetric Feeder**, **Water Cooling System**, **Pelletizer**  
**Downstream Applications**: Plastic Pellets, PVC Profiles, Composite Materials  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: What are the main advantages of bimetallic alloy twin screw assemblies over standard steel?
**A**: Bimetallic alloys like Xaloy provide superior wear resistance and corrosion protection in demanding polymer processing applications, extending service life and reducing downtime compared to standard nitrided steel assemblies.

### Q: How do I determine the right screw element configuration for my extrusion process?
**A**: Optimal configuration depends on material properties, throughput requirements, and mixing needs. Conveying elements handle material transport, kneading blocks provide intensive mixing, while reverse flight elements create backpressure for better homogenization.

### Q: What maintenance is required for twin screw assemblies in continuous plastic manufacturing?
**A**: Regular inspection for wear, proper cleaning between material changes, monitoring torque and temperature parameters, and timely replacement of worn elements are essential to maintain extrusion efficiency and product quality.

## 6. Manufacturing Compliance
- ISO 9001:2015 (QUALITY MANAGEMENT SYSTEMS)

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Twin Screw Assembly](https://cnfx.com/industry/rubber-and-plastic-product-manufacturing/product/twin-screw-assembly)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **5** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: TWIN_SCREW_ASSEMBLY | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: fd68d31a
