Rubbery-Core Braid Jointing via Melted Thermoplastic Resin
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Solution Overview
Problem
Conventional methods for jointing rubbery-core-inserted braids face issues such as insufficient adhesive force due to dented and swelled cut faces, low water resistance of cyanoacrylate adhesives, and the need for skilled labor to quickly apply quick-drying adhesives, which can lead to poor external appearance and commercial value degradation.
Innovation Solution
A method involving a thermoplastic resin or a mixture of thermoplastic resin and adhesive is used, where the resin is heated and melted to penetrate between the ends of the braid, solidified within a mold to join the ends, preventing fiber swelling and eliminating the need for flat cut faces and specialized pretreatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cyanoacrylate based adhesive is used for jointing, then productivity is improved due to quick drying, but adhesive strength and water resistance are insufficient
Solution Approach 1:
The invention changes the chemical parameters of the adhesive system by using polyurethane adhesive instead of cyanoacrylate adhesive, and controls the moisture content of the braid ends within specific ranges (5-20% for treated ends, 10-30% for untreated ends) to optimize both bonding strength and water resistance while maintaining productivity
Solution Approach 2:
The invention applies preliminary moisture control treatment to the braid ends before adhesive application by adjusting the rubber core tension during storage or transport to achieve optimal moisture content ranges, ensuring better adhesive bonding without requiring additional pretreatment steps
2Ease of manufacture
If cut faces are pressed against each other for adhesive jointing, then jointing is achieved, but external appearance deteriorates due to fiber swelling
Solution Approach 1:
The invention introduces a spacer as an intermediary element between the braid ends during jointing. The spacer maintains proper spacing and prevents direct pressure contact between the braid ends, thereby preventing fiber swelling and maintaining good external appearance while still achieving effective jointing
3Productivity
If quick drying adhesive is used, then jointing speed is improved, but skill requirement increases and labor intensity rises
Solution Approach 1:
The invention enables the braid ends to contribute to their own optimal bonding conditions through controlled moisture content adjustment via rubber core tension management during storage or transport. This self-preparation reduces the skill requirement for operators while maintaining high jointing speed with polyurethane adhesive
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
This method provides a strong, water-resistant joint without requiring flat cut faces, reduces labor, and maintains a good external appearance by containing the melted resin within a mold, enhancing the commercial value of the product.
Implementation Method 1
the thermoplastic resin (3), or the mixture of a thermoplastic resin and an adhesive is interposed between both the ends (11) (12); the thermoplastic resin (3), or the thermoplastic resin in the mixture is heated and melted
Implementation Method 2
the melted resin is caused to penetrate into the ends of the rubbery-core-inserted braid (1)
Implementation Method 3
the melted resin is solidified, thereby jointing the ends (11) (12) of the rubbery-core-inserted braid (1) to each other
Data Source
AI summary
A method for jointing a rubbery-core-inserted braid is provided. In the method, a mold made of a pair of templates is prepared, wherein the templates may be closed in such a manner that trenches can constitute a through hole into which the braid is fittable. The method includes a step of fitting an end of the braid into the trench in one of the templates, while fitting the other end of the braid into the trench, thereby approaching both the ends of the braids each other, a step of interposing a thermoplastic resin between both the ends, and a step of heating and melting the thermoplastic resin in a state where the mold is closed, causing the melted resin to penetrate into the ends of the braids, and solidifying the melted resin, thereby jointing the ends of the braids to each other.