Low permeation fuel hose
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Solution Overview
Problem
Conventional fuel hoses with PVC outer layers suffer from delamination and poor performance under extreme temperature and humidity conditions, failing to meet regulatory standards for low permeation and flammability.
Innovation Solution
A low permeation fuel hose is developed with a multi-layer construction using a composition comprising thermoplastic copolyester elastomer, polyvinyl chloride (PVC), and optionally thermoplastic polyurethane (TPU), which enhances low and high temperature performance, bonding, and meets regulatory requirements such as SAE J1527-B1.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional PVC outer layer is used in fuel hoses, then manufacturing cost is reduced and ease of manufacture is improved, but delamination occurs under extreme temperature and humidity conditions and performance reliability deteriorates
Solution Approach 1:
The patent applies composite materials by combining PVC with copolyester and TPU in a multi-layer construction. The outer cover layer comprises PVC (25-95 wt%), copolyester (5-75 wt%), and TPU (5-35 wt%), creating a composite material that maintains the ease of manufacture associated with PVC while adding the temperature resistance and bonding properties of copolyester and TPU, thereby resolving the contradiction between ease of manufacture and reliability
2Reliability
If multi-layer composite construction is used, then temperature performance and bonding durability are improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the hose into distinct functional layers: an inner tube layer for fuel containment, a reinforcement layer for structural support, and an outer cover layer for environmental protection. Each layer is optimized for its specific function, allowing the complex multi-material construction to be manufactured efficiently through sequential extrusion processes while maintaining reliability
3Ease of manufacture
If conventional PVC composition is used, then manufacturing cost is reduced, but flammability performance worsens and self-extinguishing capability is lost
Solution Approach 1:
The patent applies composite materials by incorporating TPU (5-35 wt%) and copolyester (5-75 wt%) with PVC in the outer cover layer. These additional materials contribute flame retardancy and self-extinguishing properties while maintaining cost-effectiveness through optimized formulation ratios, thereby resolving the contradiction between ease of manufacture and flammability performance
Data Source
AI summary
Low permeation fuel hose is provided comprising an outer cover layer prepared from a composition comprising a polyvinyl chloride (PVC), a thermoplastic copolyester elastomer and, optionally, a thermoplastic polyurethane (TPU), wherein the hose exhibits improved low and high temperature performance compared to conventional fuel hoses having an outer layer consisting of industrial grade PVC.