Hose Textile Layer Thread Linear Mass Reduction
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Solution Overview
Problem
Conventional hoses with textile layers for increased strength often have the textile layer visible on the outer surface, which is undesirable in certain applications, and traditional PVC materials are no longer suitable for contact with drinking water.
Innovation Solution
A hose design featuring a textile layer with threads of low linear mass (up to 300 dtex) that are thin and not visible from the outside, combined with a thermoplastic elastomer or PVC inner and intermediate layers, and a PVC outer layer, where the threads are pressed into the intermediate layer during production to enhance layer connection and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a textile layer with conventional thread linear mass (around 550 dtex) is used to reinforce the hose, then the tensile strength and pressure resistance are improved, but the textile layer becomes visible on the outer surface which is aesthetically undesirable
Solution Approach 1:
The patent applies parameter changes by reducing the linear mass of threads from conventional values (around 550 dtex) to significantly lower values (at most 300 dtex, preferably at most 130 dtex, particularly preferably at most 74 dtex). This parameter reduction makes the threads thin enough to be invisible on the outer surface while maintaining sufficient reinforcement through optimized thread arrangement and layer structure
Solution Approach 2:
The patent uses composite materials by combining multiple layers (inner layer, textile layer, intermediate layer, outer layer) with different functions. The textile layer is integrated as an invisible reinforcement within this composite structure, where the intermediate and outer layers provide aesthetic coverage while the textile layer provides strength
2Reliability
If PVC material is used for the inner layer to ensure durability and water tightness, then the hose achieves good protective properties, but it no longer complies with drinking water safety standards
Solution Approach 1:
The patent extracts and removes PVC material from contact with drinking water by eliminating it from the inner layer or reducing it to a thin intermediate layer not in contact with water. This allows compliance with drinking water standards while maintaining protective properties through alternative materials in the water-contact layers
Solution Approach 2:
The patent applies parameter changes by substituting PVC with alternative materials (such as thermoplastic elastomers or other food-grade plastics) that meet drinking water safety requirements while maintaining the necessary protective functions of water tightness and durability
3Shape
If threads with very low linear mass (at most 74 dtex) are used to ensure invisibility, then the aesthetic appearance is improved, but the processing difficulty increases
Solution Approach 1:
The patent manages processing difficulty by optimizing multiple parameters simultaneously: thread linear mass (at most 74 dtex), twist density (130 turns per meter), and layer temperatures. These coordinated parameter changes enable handling and processing of fine threads while maintaining their invisibility property
Solution Approach 2:
The patent applies local quality by giving different regions and elements different properties: the threads have specific twist and mass characteristics for invisibility, the inner layer has specific temperature and material properties for thread bonding, and the intermediate layer provides specific thickness and material composition for both coverage and compliance
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 hose achieves sufficient strength without visible reinforcement and improved layer connection, allowing for a aesthetically pleasing appearance and compliance with drinking water safety standards.
Implementation Method 1
By heating the inner layer before the threads are applied, it can be ensured during production of the hose that the threads are pressed into the surface of the intermediate layer
Data Source
Figure 1
AI summary
The invention relates to a hose (1), in particular a shower hose - with an inner layer (11), - with a textile layer (14), - with an intermediate layer (12) and - with an outer layer (13), wherein the textile layer (13) has threads with a mass per unit length of a maximum of 280 dtex.