---
title: "Screed"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:SCREED"
  data_integrity_hash: "f241b0fe15739662e5a598ad1f758007"
  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:SCREED"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/screed.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/screed"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "2.5-4.5 MPa hydraulic pressure, 120-180°C asphalt temperature, 0.5-2.0 m/min travel speed"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 5.2
    unit: "MPa"
    consequence: "Hydraulic seal extrusion failure occurs at 5.2 MPa due to elastomer yield strength limit (Shore A 90 durometer, 21 MPa tensile strength). Thermal fatigue cracking initiates at 180°C differential between screed plate (160°C) and cooling water (40°C) with ΔT &gt; 140°C. Material adhesion failure occurs when asphalt viscosity exceeds 3000 cP at 110°C."
fmea_matrix_quantitative:
  - node_1:
      trigger: "Hydraulic fluid contamination exceeding ISO 4406 18/16/13 cleanliness level"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Install 3 μm absolute beta₃≥200 filtration with continuous particle counting"
  - node_2:
      trigger: "Asphalt temperature gradient exceeding 15°C across screed width"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Implement segmented heating zones with PID control maintaining ±3°C uniformity"
bom_nodes:
  screed-plate:
    type: "component"
    urn: "URN:CNFX:ME:SCREED_PLATE"
    interface_type: "physical-logic-coupled"
  vibration-system:
    type: "part"
    urn: "URN:CNFX:ME:VIBRATION_SYSTEM"
    interface_type: "physical-logic-coupled"
  heating-system:
    type: "device"
    urn: "URN:CNFX:ME:HEATING_SYSTEM"
    interface_type: "physical-logic-coupled"
  extensionshydraulic-extensions:
    type: "part"
    urn: "URN:CNFX:ME:EXTENSIONSHYDRAULIC_EXTENSIONS"
    interface_type: "physical-logic-coupled"
  crown-control-mechanism:
    type: "part"
    urn: "URN:CNFX:ME:CROWN_CONTROL_MECHANISM"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 9001:2015 QUALITY MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/screed.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "1e9f5909966f1b77df03d4bb3063dd81ee50e19f22ef76ca80cedc8da53765c2"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Screed

## 1. Technical Definition
A critical component of an asphalt paver that levels, compacts, and finishes the asphalt mat to specified thickness and smoothness.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **2.5-4.5 MPa hydraulic pressure, 120-180°C asphalt temperature, 0.5-2.0 m/min travel speed**. Failure boundary: **Hydraulic pressure exceeding 5.2 MPa causes seal extrusion, asphalt temperature below 110°C creates material adhesion failure, vibration amplitude exceeding 0.8 mm RMS causes structural resonance**, Mechanism: **Hydraulic seal extrusion failure occurs at 5.2 MPa due to elastomer yield strength limit (Shore A 90 durometer, 21 MPa tensile strength). Thermal fatigue cracking initiates at 180°C differential between screed plate (160°C) and cooling water (40°C) with ΔT &gt; 140°C. Material adhesion failure occurs when asphalt viscosity exceeds 3000 cP at 110°C.**.

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Hydraulic fluid contamination exceeding ISO 4406 18/16/13 cleanliness level | 8 | Servo valve spool sticking causing uneven screed extension | Install 3 μm absolute beta₃≥200 filtration with continuous particle counting |
| Asphalt temperature gradient exceeding 15°C across screed width | 8 | Differential thermal expansion causing screed plate warping &gt;2 mm/m | Implement segmented heating zones with PID control maintaining ±3°C uniformity |

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

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Vibration System](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/vibration-system.md) `(Standalone System)`
- [Heating System](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/heating-system.md) `(Standalone System)`
- [Extensions/Hydraulic Extensions](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/extensionshydraulic-extensions.md) `(Standalone System)`
- [Crown Control Mechanism](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/crown-control-mechanism.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Asphalt Paver**, **Asphalt Mixing Plant**, **Compactor Roller**  
**Downstream Applications**: Road Pavement, Parking Lot Surface, Airport Runway  

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

### Q: What materials are used in manufacturing industrial screeds?
**A**: Industrial screeds are constructed from high-strength steel and abrasion-resistant alloy steel to withstand heavy use and harsh conditions in asphalt paving operations.

### Q: How does the crown control mechanism work on a screed?
**A**: The crown control mechanism allows operators to adjust the screed's curvature, enabling precise control over the asphalt mat's cross-slope and crown for proper drainage and surface profile.

### Q: Why is a heating system important for asphalt paver screeds?
**A**: The heating system prevents asphalt from sticking to the screed plate, ensures consistent material flow, and maintains proper compaction temperature for optimal mat finish and density.

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

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

### 🌐 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**: SCREED | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 8994c9dc
