Heat-Resistant Flexible Hose With ETFE Barrier Layer Bonding
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Solution Overview
Problem
Conventional heat resistant flexible hoses used in food, cosmetics, and pharmaceutical manufacturing face issues with durability due to decreased adhesive strength between fluororesin and silicone rubber layers under repeated cleaning and bending, leading to reduced pressure resistance and short hose lifespan, along with increased manufacturing complexity and costs.
Innovation Solution
A heat resistant flexible hose design featuring self-adhesive ethylene-tetrafluoroethylene copolymer and silicone rubber layers with a reinforcing wire, eliminating the need for a silicone rubber primer and allowing crosslinking adhesion at lower temperatures, thereby enhancing durability and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If crosslinking adhesion using silicone rubber primer is used to adhere fluororesin and silicone rubber layers, then adhesive strength is initially achieved, but adhesive strength deteriorates sharply under repeated cleaning and bending vibrations, reducing durability
Solution Approach 1:
The patent removes the silicone rubber primer layer from the conventional structure, directly adhering fluororesin to silicone rubber through crosslinking adhesion without the intermediate primer layer. This eliminates the primer's degradation under cleaning and vibration conditions that causes adhesive strength loss.
Solution Approach 2:
The patent uses a composite structure combining fluororesin and silicone rubber layers with direct crosslinking adhesion, creating an integrated multi-material system that maintains adhesive strength under repeated cleaning and bending conditions without requiring a primer interface.
2Strength
If silicone rubber primer processing is added before adhering layers, then adhesion is achieved, but the number of processes increases and manufacturing complexity increases
Solution Approach 1:
The patent eliminates the silicone rubber primer processing step entirely, reducing the manufacturing process from multiple steps (surface treatment, primer application, curing, adhesion) to a simpler direct crosslinking adhesion process between fluororesin and silicone rubber layers.
Solution Approach 2:
The patent combines the adhesion function and crosslinking function into a single integrated process, where fluororesin and silicone rubber are directly crosslinked without requiring separate primer application and curing steps, thereby simplifying the manufacturing process.
3Strength
If high temperature heating (270°C or higher) is used for crosslinking adhesion, then adhesive strength between fluororesin and silicone rubber is achieved, but polyester fiber reinforcing layer deteriorates thermally
Solution Approach 1:
The patent changes the adhesion mechanism from high-temperature crosslinking (270°C or higher) to low-temperature crosslinking (below polyester fiber's thermal deterioration point), enabling adhesive strength to be achieved without exposing the reinforcing layer to damaging temperatures.
Solution Approach 2:
The patent introduces a specific crosslinking adhesion mechanism that acts as an intermediary process, allowing fluororesin and silicone rubber to bond effectively at lower temperatures through controlled crosslinking reactions that occur below the polyester fiber's thermal degradation threshold.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides improved mechanical properties for withstanding cleaning, bending, and vibrations, extending hose lifespan, simplifying manufacturing, and reducing costs by maintaining adhesive strength and preventing flavor, color, and taste transfer, while ensuring excellent transparency and hygiene control.
Implementation Method 1
adheres thereto by crosslinking adhesion
Implementation Method 2
heating at a temperature higher than the melting point of the self-adhesive ethylene tetrafluoride copolymer
Implementation Method 3
inner peripheral surface adheres thereto by crosslinking adhesion
Implementation Method 4
forms a laminate with the inner layer part by extruding molding or coating molding
Data Source
Figure 1
AI summary
Excellent mechanical properties which can withstand repetition of various types of cleaning, bending, and vibration are provided, and an inner surface of a barrier layer is prevented from being flavored, colored, seasoned due to changing of fluid passing through an inner hose for a long period of time. A heat resistant flexible hose is characterized by including: a plurality of heat resistant layers formed of silicone rubber as a main component; a reinforcing layer provided by winding a reinforcing wire between the plurality of heat resistant layers; and a barrier layer which is radially opposed to an inner layer part of the plurality of heat resistant layers made of self adhesive silicone rubber and is provided in contact with a fluid passing through the hose, in which the barrier layer uses a self adhesive ethylene-tetrafluoroethylene copolymer having a melting point of 240°C or less and forms a laminate with the inner layer part by extruding molding or coating molding and performs crosslinking adhesion therebetween.