Braided PE-RT Hose Structure for Flexibility and Buckling Resistance
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Solution Overview
Problem
Hoses with braids lack optimal balance between flexibility and buckling resistance, and existing manufacturing methods do not adequately ensure stable connection of hose nipples without compromising mechanical stability or flow resistance.
Innovation Solution
The inner hose is made of uncrosslinked PE-RT material with specific density and melt flow index, and a braid with controlled braid angle and coverage is used, along with a hose nipple design that matches the inner diameter to prevent excessive joining gaps, and a thermal treatment to facilitate easy plugging and prevent buckling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a braid is added to the hose to prevent rupture and ensure tensile strength, then the mechanical strength and rupture resistance are improved, but the flexibility and ease of bending deteriorate
Solution Approach 1:
The hose is designed with different structural characteristics in different regions: the inner hose provides flexibility while the outer braid provides strength. Each layer performs its specific function locally, allowing the overall hose to achieve both flexibility and tensile strength without compromise.
Solution Approach 2:
The hose combines different materials with complementary properties: the inner hose made of thermoplastic material provides flexibility and ease of bending, while the outer braid made of synthetic fibers or metal wires provides tensile strength and rupture resistance. This composite structure resolves the contradiction between strength and flexibility.
2Stability of the object's composition
If the wall thickness of the inner hose is increased to improve buckling resistance, then the mechanical stability is improved, but the flow resistance increases
Solution Approach 1:
The hose design optimizes the wall thickness parameter within specific ranges (e.g., 0.5-2.0 mm) to achieve the desired balance between buckling resistance and flow resistance. By carefully selecting and controlling this parameter, the hose achieves sufficient mechanical stability without excessive flow resistance.
3Adaptability or versatility
If a hose nipple is plugged into the hose to enable detachable connection, then the adaptability and ease of connection are improved, but the mechanical stability and risk of leakage deteriorate
Solution Approach 1:
The hose nipple is pre-designed with specific geometric features (such as tapered surfaces, ribs, or sealing elements) that prepare the connection interface in advance. This preliminary design ensures that when the nipple is inserted into the hose, it automatically achieves proper alignment and sealing, maintaining connection stability while enabling detachability.
4Ease of manufacture
If the melt flow index of the thermoplastic material is increased to improve processability, then the ease of manufacture is improved, but the mechanical strength and buckling resistance deteriorate
Solution Approach 1:
The melt flow index of the thermoplastic material is carefully controlled within specific ranges (e.g., 0.5-2.0 g/10 min) to achieve the optimal balance between processability and mechanical strength. By precisely controlling this material parameter, the hose can be manufactured efficiently while maintaining sufficient buckling resistance and mechanical strength.
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 achieves improved flexibility, buckling resistance, and stable hose nipple connections with reduced flow resistance and mechanical stability, suitable for various applications including sanitary and kitchen sectors.
Implementation Method 1
an inner diameter of the hose is widened by a thermal treatment, in particular using a mandrel heated to at least a Vicat softening temperature
Data Source
AI summary
A hose (1) having an inner hose (2) from an uncured, thermoplastic material is produced and the inner hose (2) is thermally expanded.