---
title: "Metering Section"
industry: "Rubber and Plastic Product Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:METERING_SECTION"
  data_integrity_hash: "7252964a2f3fe3db4851b463c753d138"
  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:METERING_SECTION"
  data_source_uri: "https://cnfx.com/llms/industry/rubber-and-plastic-product-manufacturing/product/metering-section.md"
  official_resource_url: "https://cnfx.com/industry/rubber-and-plastic-product-manufacturing/product/metering-section"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "15-80 bar at 0.5-2.5 MPa·s melt viscosity"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 12
    unit: "bar"
    consequence: "Shear-induced polymer degradation occurs when shear rate exceeds 1000 s⁻¹, causing molecular chain scission and viscosity reduction"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Barrel temperature deviation exceeding ±5°C from setpoint"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Triple-zone PID control with redundant thermocouples and thermal buffer design"
  - node_2:
      trigger: "Screw wear increasing flight clearance beyond 0.15% of diameter"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Nitrided steel construction with 62 HRC surface hardness and 0.8 mm wear allowance"
bom_nodes:
  flight:
    type: "component"
    urn: "URN:CNFX:ME:FLIGHT"
    interface_type: "physical-logic-coupled"
  root:
    type: "component"
    urn: "URN:CNFX:ME:ROOT"
    interface_type: "physical-logic-coupled"
  flight-land:
    type: "component"
    urn: "URN:CNFX:ME:FLIGHT_LAND"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "CE MARKING: PRESSURE EQUIPMENT DIRECTIVE 2014/68/EU"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/rubber-and-plastic-product-manufacturing/product/metering-section.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "ca909380b3a1300b50b7c1afd95d6291305c52db3d95f7af79db3e1c81efcc13"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Metering Section

## 1. Technical Definition
The final section of an extrusion screw where molten material is precisely metered and pumped at constant pressure through the die.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **15-80 bar at 0.5-2.5 MPa·s melt viscosity**. Failure boundary: **Pressure drop below 12 bar or exceeding 85 bar at 220°C polymer temperature**, Mechanism: **Shear-induced polymer degradation occurs when shear rate exceeds 1000 s⁻¹, causing molecular chain scission and viscosity reduction**.

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Barrel temperature deviation exceeding ±5°C from setpoint | 8 | Melt viscosity fluctuation &gt;10% causing pressure instability | Triple-zone PID control with redundant thermocouples and thermal buffer design |
| Screw wear increasing flight clearance beyond 0.15% of diameter | 8 | Pressure drop of 25% at constant screw speed | Nitrided steel construction with 62 HRC surface hardness and 0.8 mm wear allowance |

## 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**: **Extruder Barrel and Screw**, **Temperature Control Unit**, **Gear Pump**  
**Downstream Applications**: Plastic Pipes and Tubes, Plastic Sheets and Films, Plastic Profiles  

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

### Q: What is the primary function of the metering section in extrusion screws?
**A**: The metering section precisely meters molten material and pumps it at constant pressure through the extrusion die, ensuring consistent product dimensions and quality in rubber and plastic manufacturing.

### Q: Which materials are best for metering section components in abrasive applications?
**A**: Bimetallic alloys and nitrided steel offer superior wear resistance for abrasive materials, while tool steel provides durability for general applications, and stainless steel is preferred for corrosive environments.

### Q: How do flight land dimensions affect metering section performance?
**A**: Flight land width and clearance directly impact pumping efficiency, pressure stability, and melt temperature control. Proper dimensions minimize leakage backflow and ensure consistent throughput to the die.

## 6. Manufacturing Compliance
- CE MARKING: PRESSURE EQUIPMENT DIRECTIVE 2014/68/EU

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Metering Section](https://cnfx.com/industry/rubber-and-plastic-product-manufacturing/product/metering-section)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **3** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: METERING_SECTION | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 5b40e35a
