---
title: "Annular Die"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:ANNULAR_DIE"
  data_integrity_hash: "3e325885721ac71082fea2e46725251a"
  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:ANNULAR_DIE"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/annular-die.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/annular-die"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "15-35 MPa internal pressure, 180-240°C temperature, 0.5-2.5 m/min extrusion speed"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 45
    unit: "MPa"
    consequence: "Von Mises stress exceeding H13 tool steel yield strength (1650 MPa) causes plastic deformation; Arrhenius kinetics accelerate polymer degradation above 280°C; Reynolds number &lt; 2000 induces laminar flow instability"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Non-uniform thermal gradient exceeding 15°C/mm across die face"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Integrate 12-zone PID-controlled cartridge heaters with 0.5°C resolution feedback"
  - node_2:
      trigger: "Polymer melt fracture at wall shear stress &gt; 0.14 MPa·s"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Implement conical flow channel with 8:1 L/D ratio and 2° taper angle"
bom_nodes:
  die-body:
    type: "component"
    urn: "URN:CNFX:ME:DIE_BODY"
    interface_type: "physical-logic-coupled"
  mandrel:
    type: "component"
    urn: "URN:CNFX:ME:MANDREL"
    interface_type: "physical-logic-coupled"
  spiral-grooves:
    type: "component"
    urn: "URN:CNFX:ME:SPIRAL_GROOVES"
    interface_type: "physical-logic-coupled"
  die-lip:
    type: "component"
    urn: "URN:CNFX:ME:DIE_LIP"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
  - standard: "CE MARKING - EU CONFORMITY FOR MACHINERY SAFETY (2006/42/EC)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/annular-die.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "b7dd49483fd6dda8d5565ee05da44dd9b826d6c0c774b46bda5a9a40cf3b1955"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Annular Die

## 1. Technical Definition
A critical component in plastic film blowing machines that shapes molten plastic into a continuous tubular film.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **15-35 MPa internal pressure, 180-240°C temperature, 0.5-2.5 m/min extrusion speed**. Failure boundary: **Material yield strength exceeded at 45 MPa internal pressure, thermal degradation above 280°C, or flow instability below 0.3 m/min**, Mechanism: **Von Mises stress exceeding H13 tool steel yield strength (1650 MPa) causes plastic deformation; Arrhenius kinetics accelerate polymer degradation above 280°C; Reynolds number &lt; 2000 induces laminar flow instability**.

### 2.1 Analytical Physics Model
Governed by the **Heat Sterilization F0 Lethality Model**:

> **Primary Equation**: $F_0 = \int_{0}^{t} 10^{(T-121.1)/z} dt$  
> **Engineering Impact**: Validates microbial reduction integrity for aseptic packaging.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| T | Process Temp (°C) | **$T \in [180-240°C]$ °C** (Per `temperature_range`) |
| t | Exposure Time (min) | Engineering Constant |
| z | Z-value | **10 °C** (Standard for *C. botulinum*) |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Non-uniform thermal gradient exceeding 15°C/mm across die face | 8 | Differential thermal expansion creates &gt;0.1 mm radial misalignment | Integrate 12-zone PID-controlled cartridge heaters with 0.5°C resolution feedback |
| Polymer melt fracture at wall shear stress &gt; 0.14 MPa·s | 8 | Surface defects propagate as sharkskin roughness &gt; 5 μm Ra | Implement conical flow channel with 8:1 L/D ratio and 2° taper angle |

## 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**, **Air Ring Cooling System**, **Nip Rollers**  
**Downstream Applications**: Plastic Shopping Bags, Agricultural Film, Packaging Film  

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

### Q: What materials are best for annular dies in high-volume plastic film production?
**A**: For high-volume production, hardened steel alloys and tool steel are recommended due to their exceptional wear resistance and ability to maintain precise tolerances under continuous thermal cycling and mechanical stress.

### Q: How do spiral grooves in an annular die affect film quality?
**A**: Spiral grooves evenly distribute molten plastic around the die circumference, eliminating weld lines and ensuring uniform wall thickness in the tubular film, which is critical for consistent strength and optical clarity in the final product.

### Q: What maintenance is required for annular dies in machinery manufacturing?
**A**: Regular cleaning to prevent plastic buildup, inspection of die lips and mandrel for wear or damage, and proper storage in a controlled environment to prevent corrosion are essential maintenance practices to extend die life and maintain film quality.

## 6. Manufacturing Compliance
- ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS
- CE MARKING - EU CONFORMITY FOR MACHINERY SAFETY (2006/42/EC)

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Annular Die](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/annular-die)**

### 🌐 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**: ANNULAR_DIE | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: b54bc31d
