---
title: "Extrusion Screw"
industry: "Food Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:EXTRUSION_SCREW"
  data_integrity_hash: "01c997790ef39b07c7011568c9ea3f48"
  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:EXTRUSION_SCREW"
  data_source_uri: "https://cnfx.com/llms/industry/food-manufacturing/product/extrusion-screw.md"
  official_resource_url: "https://cnfx.com/industry/food-manufacturing/product/extrusion-screw"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.5-3.0 MPa pressure, 50-300 RPM rotational speed, 150-250°C barrel temperature"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 350
    unit: "MPa"
    consequence: "High-cycle fatigue from cyclic shear stress at screw root (σ_max &gt; σ_endurance limit), thermal degradation of polymer causing increased viscosity and torque spikes, abrasive wear from fillers exceeding 40% by volume"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Insufficient L/D ratio (below 20:1) causing incomplete melting"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Implement screw design with 25:1 L/D ratio and barrier melting section"
  - node_2:
      trigger: "Hardened steel surface hardness below 58 HRC"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Apply tungsten carbide coating with minimum 65 HRC surface hardness"
bom_nodes:
  feed-section:
    type: "component"
    urn: "URN:CNFX:ME:FEED_SECTION"
    interface_type: "physical-logic-coupled"
  compressiontransition-section:
    type: "part"
    urn: "URN:CNFX:ME:COMPRESSIONTRANSITION_SECTION"
    interface_type: "physical-logic-coupled"
  metering-section:
    type: "part"
    urn: "URN:CNFX:ME:METERING_SECTION"
    interface_type: "physical-logic-coupled"
  flight:
    type: "component"
    urn: "URN:CNFX:ME:FLIGHT"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
  - standard: "DIN 16742:2013 - PLASTICS AND RUBBER MACHINES - EXTRUSION BLOW MOULDING MACHINES - SAFETY REQUIREMENTS"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/food-manufacturing/product/extrusion-screw.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "060acf7ff43a85cdaa020a082bb11714a4931edf01fbc9a77ec676de523c8b18"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Extrusion Screw

## 1. Technical Definition
A rotating helical shaft that conveys, compresses, melts, and homogenizes food materials within an extrusion barrel.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.5-3.0 MPa pressure, 50-300 RPM rotational speed, 150-250°C barrel temperature**. Failure boundary: **Shear stress exceeding 350 MPa at screw root, temperature exceeding 300°C causing polymer degradation, torque exceeding 1200 N·m**, Mechanism: **High-cycle fatigue from cyclic shear stress at screw root (σ_max &gt; σ_endurance limit), thermal degradation of polymer causing increased viscosity and torque spikes, abrasive wear from fillers exceeding 40% by volume**.

### 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 |
| :--- | :--- | :--- | :--- |
| Insufficient L/D ratio (below 20:1) causing incomplete melting | 8 | Solid polymer fragments causing screw seizure | Implement screw design with 25:1 L/D ratio and barrier melting section |
| Hardened steel surface hardness below 58 HRC | 8 | Abrasive wear rate exceeding 0.1 mm/1000 operating hours | Apply tungsten carbide coating with minimum 65 HRC surface hardness |

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

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Compression/Transition Section](https://cnfx.com/llms/industry/rubber-and-plastic-product-manufacturing/product/compressiontransition-section.md) `(Standalone System)`
- [Metering Section](https://cnfx.com/llms/industry/rubber-and-plastic-product-manufacturing/product/metering-section.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Extrusion Barrel**, **Feeder Hopper**, **Temperature Control Unit**  
**Downstream Applications**: Breakfast Cereals, Pet Food Kibble, Textured Vegetable Protein  

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

### Q: What are the advantages of using a bimetallic alloy extrusion screw in food manufacturing?
**A**: Bimetallic extrusion screws combine a tough steel base with a hard-facing alloy surface, offering superior wear resistance, extended service life, and reduced contamination risk in abrasive food processing applications like cereals or pet food.

### Q: How does the compression/transition section of an extrusion screw affect food product quality?
**A**: The compression/transition section gradually reduces the channel depth, increasing pressure and shear to melt and homogenize food materials. Proper design ensures consistent texture, density, and cooking of final products like snacks or pasta.

### Q: What maintenance is required for nitrided steel extrusion screws in food processing?
**A**: Nitrided steel screws require regular inspection for wear, especially on flights and metering sections, and cleaning to prevent material buildup. Their hardened surface resists abrasion but should be checked periodically to maintain optimal performance and hygiene.

## 6. Manufacturing Compliance
- ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS
- DIN 16742:2013 - PLASTICS AND RUBBER MACHINES - EXTRUSION BLOW MOULDING MACHINES - SAFETY REQUIREMENTS

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Extrusion Screw](https://cnfx.com/industry/food-manufacturing/product/extrusion-screw)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **4** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: EXTRUSION_SCREW | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 0d985bcf
