Crimp-on Pipe Accessory with Pressure-Activated Adhesive
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Solution Overview
Problem
Existing pipe connection accessories face challenges in preventing rotational separation after crimping without degrading fatigue performance or requiring significant modifications to crimping conditions, particularly when using ductile materials like aluminum.
Innovation Solution
A connection accessory with a sleeve coated on one portion with a multicomponent adhesive, where one component is encapsulated and activated by pressure during crimping, providing improved resistance to rotational separation while maintaining fatigue performance and avoiding complex crimping modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If raised and recessed portions are added to the sleeve surface to improve rotational resistance, then fastening effect is enhanced, but the raised portions are blunted during crimping which minimizes the fastening effect
Solution Approach 1:
An adhesive layer is introduced as an intermediary substance between the sleeve and pipe end. The adhesive comprises encapsulated components that are released and activated during crimping, creating a strong bonding interface that prevents rotation without relying on mechanical interlocking features that would be blunted by crimping forces.
Solution Approach 2:
The adhesive properties are changed through pressure-activated release of encapsulated components during crimping. The transition from encapsulated to active adhesive state occurs under the specific pressure conditions of crimping, transforming the bonding mechanism from mechanical to chemical adhesion.
2Reliability
If crimping force is increased to improve radial pressure and rotational resistance, then fastening is enhanced, but the material work hardening is limited which reduces the effectiveness of increased crimping force
Solution Approach 1:
The mechanical pressure-based fastening system is replaced with a chemical adhesion system. Instead of relying on radial pressure generated by crimping force to prevent rotation, the adhesive creates chemical bonds that provide rotational resistance independent of the magnitude of crimping force applied.
Solution Approach 2:
The bonding mechanism transitions from mechanical pressure dependence to chemical adhesion through pressure-activated release of encapsulated adhesive components. This parameter change allows rotational resistance to be achieved without being limited by the material's work hardening characteristics.
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 significantly enhances torsion resistance by up to 500% compared to standard accessories, ensuring reliable mechanical performance without compromising fatigue resistance or accessibility constraints.
Implementation Method 1
the surface of the sleeve that is adapted to come into crimping contact with the end of the tube includes at least one portion coated with an adhesive comprising at least two components one of which is encapsulated
Implementation Method 2
one of which is encapsulated and activated by pressure during crimping
Data Source
AI summary
A pipe connection accessory 1 comprising a sleeve 4 designed to be crimped onto one end of a pipe tube and designed to engage at least indirectly with another pipe element, is characterized in that that surface 4A of the sleeve which is intended to come into crimped contact with the end of the tube comprises an adhesive-coated portion 10 comprising an adhesive made up of at least two components, one of which is encapsulated. This adhesive-coated portion is advantageously set back, preferably with projecting collars.