Multilayer Hose Adhesion Layer for Diffusion Barrier Durability
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Solution Overview
Problem
Existing multilayered tubes or hoses face challenges in maintaining a strong and durable bond between the diffusion reducing sheath and the force bearing sheath, especially under conditions of frequent bending, vibration, or pressure changes, which leads to delamination and reduced lifespan.
Innovation Solution
A multilayered tube or hose design that includes a force bearing sheath, a diffusion reducing sheath, and an adhesion promoting layer between them, composed of a specific mixture of acrylonitrile butadiene rubber, styrene butadiene rubber, carbon black, calcium magnesium carbonate, and other additives, which enhances the bonding force and longevity of the connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a diffusion reducing sheath is added to reduce permeability, then the permeability resistance is improved, but the bonding strength between layers deteriorates due to delamination under bending and vibration
Solution Approach 1:
An adhesion promoting layer is introduced as an intermediary between the force bearing sheath and the diffusion reducing sheath. This intermediate layer specifically addresses the bonding weakness by providing enhanced adhesion properties, preventing delamination while allowing the diffusion reducing sheath to maintain its permeability resistance function.
Solution Approach 2:
The tube or hose employs a composite multilayered structure combining different materials with specific properties: a force bearing sheath for mechanical strength, a diffusion reducing sheath for permeability resistance, and an adhesion promoting layer for bonding. This composite approach allows each layer to optimize its specific function while working together as an integrated system.
2Ease of manufacture
If standard bonding methods are used between sheaths, then the manufacturing process is simple, but the bonding strength deteriorates under frequent bending and vibration
Solution Approach 1:
The adhesion promoting layer serves as a specialized intermediary that provides strong bonding under dynamic conditions. While it adds a layer to the structure, it can be applied as a coating or thin layer during the manufacturing process, maintaining relative manufacturing simplicity while dramatically improving bonding strength and resistance to delamination under bending and vibration.
3Object-affected harmful factors
If metal tubes are used to achieve low permeability, then the permeability resistance is improved, but the weight and flexibility deteriorate
Solution Approach 1:
Instead of using heavy metal tubes, the invention employs a composite structure with a diffusion reducing sheath made from polymer materials that provide equivalent permeability resistance. This composite approach achieves the desired low permeability while maintaining lightweight properties and flexibility characteristic of polymer-based tubes and hoses.
4Adaptability or versatility
If the tube undergoes frequent bending and vibration, then the adaptability is improved, but the bonding between sheaths deteriorates leading to delamination
Solution Approach 1:
The adhesion promoting layer acts as a resilient intermediary that accommodates the stress from frequent bending and vibration. This intermediate layer is specifically designed to maintain strong bonding under dynamic mechanical conditions, allowing the tube to be flexible and adaptable while preventing delamination of the sheath layers.
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 proposed design significantly increases the bonding strength and durability between the diffusion reducing sheath and the force bearing sheath, thereby extending the lifespan of the multilayered tube or hose and reducing the risk of delamination.
Implementation Method 1
an adhesion promoting layer that is arranged between the force bearing sheath and the diffusion reducing sheath and that increases the bonding force between the force bearing sheath and the diffusion reducing sheath
Implementation Method 2
the permeability of the tube or hose with respect to (for example) oxygen may be problematic, since oxygen may lead to a deterioration or an early spoiling of food to be processed
Data Source
Figure 1~2
AI summary
The invention relates to a multilayered hose (1, 10) with a plurality of coaxially arranged sheaths (2, 3, 4, 5, 6, 7, 8, 12, 13). The multilayered hose (1, 10) comprises at least a force bearing sheath (2, 6), a diffusion reducing sheath (4), and an adhesion promoting layer (3, 5) that is arranged between the force bearing sheath (2, 6) and the diffusion reducing sheath (4) and that increases the bonding force between said force bearing sheath (2, 6) and said diffusion reducing sheath (4). The adhesion promoting layer (3, 5) comprises a mixture of: 65 to 85 parts of acrylonitrile butadiene rubber, 15 to 35 parts of styrene butadiene rubber, 75 to 125 parts of carbon black N990, 30 to 100 parts of calcium magnesium carbonate, 5 to 15 parts of zinc oxide, 5 to 20 parts of magnesium-aluminium hydroxycarbonate, 25 to 125 parts of resin package blend, 2 to 10 parts of N-(1.3-dimethylbutyl)-N'-phenyl-p-phenylendiamine, 5 to 15 parts of triallyl cyanurate, and 0.5 to 5 parts of a vulcanizing agent.