HMPE Eye-Splice Rope for Trawl Nets
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Solution Overview
Problem
Conventional ropes for trawl nets experience frequent breakage due to stress concentration at the eye-splice, leading to high tension and operational inefficiencies, necessitating a rope with increased breaking strength and reduced weight and volume.
Innovation Solution
A rope for trawl nets featuring an HMPE material eye portion and splice portion, with first and second fixing members to prevent unraveling, and an HMPE sheathed strand portion woven in a blade manner around a basic polyethylene rope, enhancing the strength and durability of the eye-splice.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ropes are used for trawl nets, then the rope structure is simple and easy to manufacture, but the eye-splice breaks frequently due to stress concentration
Solution Approach 1:
The patent applies composite materials by combining HMPE (high-modulus polyethylene) and PE (polyethylene) materials in a single rope structure. The HMPE material is used specifically for the eye-splice portion where high strength is needed, while PE material is used for other portions. This composite approach resolves the contradiction by providing enhanced reliability at the critical eye-splice area without requiring complete redesign of the entire rope system.
Solution Approach 2:
The patent implements local quality by applying different material properties to different parts of the rope. The eye-splice portion is made of HMPE material with high tensile strength to withstand stress concentration, while other portions use standard PE material. This localized enhancement of material quality resolves the contradiction by strengthening only the critical area rather than the entire rope, thereby improving eye-splice reliability without excessive complexity.
2Strength
If HMPE material is used for the entire rope, then the breaking strength increases, but the cost and manufacturing complexity increase
Solution Approach 1:
The patent applies local quality by using HMPE material only for the eye-splice portion where high breaking strength is critical, while using standard PE material for other portions of the rope. This selective material application achieves the necessary breaking strength at the critical joint without requiring expensive HMPE material throughout the entire rope, thereby maintaining ease of manufacture.
Solution Approach 2:
The patent segments the rope into different material zones: an HMPE eye-splice portion and PE other portions. This segmentation allows each segment to be optimized for its specific function - the HMPE segment provides high strength where needed, while the PE segments maintain manufacturing simplicity and cost-effectiveness for non-critical areas.
3Weight of stationary object
If traditional rope materials are used, then the manufacturing cost is low, but the weight and volume of the trawl net are high
Solution Approach 1:
The patent uses composite materials (HMPE and PE) to achieve a balance between weight reduction and material quantity. HMPE material has higher strength-to-weight ratio compared to traditional materials, allowing for reduced material quantity while maintaining or improving strength. This composite approach resolves the contradiction by enabling weight reduction through superior material properties without requiring excessive material quantity.
Solution Approach 2:
The patent changes the material parameters by transitioning from traditional rope materials to HMPE material for the eye-splice portion. HMPE has different physical parameters including higher tensile strength and lower density, which directly address the contradiction by reducing weight while maintaining structural integrity with appropriate material quantity.
Data Source
AI summary
A rope for trawl nets having a high-strength eye-splice comprises an eye portion made of an HMPE material and tied round the end of the rope; a first fixing member preventing the eye portion from unraveling; an HMPE splice portion formed in a splice manner and having an outside and an inside that comprise HMPE, respectively; an HMPE sheathed strand portion in which a basic rope is interpolated inside, and strands of an HMPE material are woven in a blade manner on the outside of the basic rope; a second fixing member located at the end of the HMPE sheathed strand portion and capable of fixing the HMPE sheathed strand portion so that it does not come loose; and a basic rope portion comprising a general PE material.