Multilayer Assembly Anchoring Elements Adhesion
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Solution Overview
Problem
Current multilayer assemblies with thermoplastic and thermoset polyurethane foam layers face adhesion issues, leading to mechanical weakness and difficulty in recycling, especially under extreme conditions, and existing solutions like surface treatment and compatibilizers have drawbacks such as environmental hazards and high costs.
Innovation Solution
A multilayer assembly featuring a thermoplastic polymer layer with anchoring elements that project from its surface and penetrate into a thermoset polyurethane foam layer, enhancing mechanical anchoring and adhesion without the need for chemical treatments or expensive processes, using recyclable materials and existing equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If chemical surface treatment methods (corona discharge, plasma, flame, ozone) are used to enhance adhesion, then adhesion properties are improved, but environmental hazards and health effects occur due to interior contamination and chemical degradation
Solution Approach 1:
The patent replaces chemical treatment methods with a mechanical anchoring system. Anchoring elements with protrusions and recesses create physical interlocking between the thermoplastic layer and polyurethane foam layer, eliminating the need for chemical surface treatments and their associated environmental hazards.
Solution Approach 2:
The anchoring elements serve as an intermediary mechanical structure between the two incompatible materials. These elements provide a physical bridge that facilitates adhesion through mechanical interlocking rather than chemical bonding, avoiding contamination issues.
2Strength
If compatibilizers (functionalized polyolefins, maleic anhydride-modified polyethylenes) are added to enhance adhesion, then adhesion is improved, but manufacturing costs increase significantly
Solution Approach 1:
The patent uses simple, inexpensive anchoring elements made from basic thermoplastic materials rather than expensive specialized compatibilizers. These anchoring elements can be produced cost-effectively through standard molding processes, significantly reducing manufacturing costs while achieving the required adhesion.
Solution Approach 2:
The invention changes the approach from chemical modification (compatibilizers) to structural modification (anchoring elements with specific geometries). By altering the physical structure rather than chemical composition, the patent achieves adhesion without the high costs associated with specialized chemical additives.
3Strength
If foamed polyurethane layer and molded thermoplastic layer are bonded together, then mechanical properties are improved, but recycling becomes extremely difficult due to inability to separate layers
Solution Approach 1:
The patent segments the bonding mechanism into discrete anchoring elements that physically connect the two layers. This segmentation allows for potential separation during recycling, as the anchoring elements can be removed or the layers can be separated more easily compared to fully bonded chemical interfaces.
Solution Approach 2:
The mechanical anchoring system facilitates the recovery and separation of materials for recycling. The anchoring elements can be removed or the layers separated, allowing the thermoplastic and polyurethane foam to be recovered and reused, addressing the recyclability issue.
4Reliability
If thermoplastic layer and polyurethane foam layer are bonded under extreme temperature variations, then structural integrity is maintained, but layer distortion occurs due to differential thermal expansion
Solution Approach 1:
The patent applies local quality by creating zones of mechanical connection (anchoring elements) distributed throughout the interface. These localized anchoring points accommodate differential thermal expansion while maintaining overall structural integrity, preventing widespread layer distortion.
Solution Approach 2:
The mechanical anchoring system provides dynamic flexibility to accommodate thermal expansion and contraction. The protrusions and recesses can move slightly relative to each other, allowing the structure to adapt to temperature variations without causing rigid layer distortion.
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 increases the pull-off strength and mechanical bending strength of the multilayer assembly while maintaining insulation properties and environmental sustainability, allowing for effective use under variable conditions without layer distortion.
Implementation Method 1
anchoring elements that project from its surface and penetrate into a thermoset polyurethane foam layer, enhancing mechanical anchoring and adhesion
Data Source
AI summary
A multi-layer assembly comprising: i. at least one first layer [layer (L1)] made from a thermoplastic polymer [polymer TL1 ] selected from the group of ethylene-based polymers, polypropylene-based polymers, polyvinyl chloride (PVC) polymers, polyamide polymers and polycarbonate polymers and mixtures thereof; and ii. anchoring elements, wherein said anchoring elements are adhered to said layer (L1) and are projecting from a surface of said layer (L1) and wherein said anchoring elements are made from at least one thermoplastic polymer [polymer Tae], wherein said polymer Tae is equal to or different from the polymer TL1 comprised in layer (L1); and iii. at least one second layer [layer (L2)], wherein said anchoring elements adhered to said layer (L1) are penetrating into said layer (L2) thereby anchoring layer (L1) to layer (L2) and wherein said layer (L2) comprises a thermoset polyurethane foam.