Mattress Assembly with Phase-Transition Adhesive for Part Replacement
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Solution Overview
Problem
Mattresses are often discarded prematurely or too late, leading to unnecessary waste, as existing methods do not effectively monitor their quality, and adhesives used in their assembly are not designed for easy disconnection, resulting in inefficient recycling and potential environmental harm.
Innovation Solution
A method for monitoring the quality of a mattress by assessing properties like local elasticity and integrity, using an adhesive with a first-order phase-transition temperature between 80°C and 180°C, allowing for easy disconnection and replacement of worn parts, thereby extending the mattress's lifespan and reducing waste by enabling more efficient recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If traditional adhesives are used to connect mattress parts, then the mattress structure is stable and durable, but the mattress cannot be easily disassembled for recycling or part replacement
Solution Approach 1:
The adhesive's bonding properties are changed by altering its temperature parameter. At room temperature, the adhesive maintains strong bonding strength to hold mattress parts together. When heated to a specific temperature, the adhesive's bonding strength decreases, allowing easy separation of parts. This parameter change enables both strong assembly and easy disassembly without requiring different adhesives for different stages.
Solution Approach 2:
The adhesive undergoes a phase transition from a solid bonded state to a liquid or softened state when heated. This phase transition causes the adhesive to lose its bonding strength temporarily, allowing parts to be separated easily. After cooling, the adhesive returns to its bonded state, enabling the parts to be reconnected. This phase transition mechanism resolves the contradiction between strong bonding and easy disassembly.
2Reliability
If mattresses are discarded when showing signs of wear, then quality issues are avoided, but unnecessary waste is generated
Solution Approach 1:
The mattress is divided into separate, replaceable parts connected by temperature-sensitive adhesives. When a specific part shows wear or quality issues, only that individual part needs to be removed and replaced, while the rest of the mattress remains functional. This segmentation allows selective replacement rather than discarding the entire mattress, reducing waste while maintaining reliability.
Solution Approach 2:
Instead of discarding the entire mattress when parts wear out, the worn parts are selectively removed and replaced while recovering and reusing the still-functional parts. The temperature-sensitive adhesive enables easy separation of worn parts from the mattress assembly, allowing the good parts to be recovered and reused in new mattress configurations, thereby reducing waste generation.
3Reliability
If the entire mattress is replaced when one part fails, then quality is maintained, but resource waste increases due to recycling difficulties
Solution Approach 1:
The mattress is designed as an assembly of separate parts connected by temperature-sensitive adhesives. When one part fails, only that specific part needs to be replaced, not the entire mattress. This segmentation maintains mattress quality by ensuring all functional parts remain in use while simplifying recycling, as individual parts can be separately processed and reused in new mattress assemblies.
Solution Approach 2:
The adhesive's temperature-sensitive properties enable easy separation of mattress parts for recycling. When heated, the adhesive's bonding strength decreases, allowing parts to be easily separated without complex disassembly processes. This facilitates efficient recycling and reuse of mattress parts, improving manufacturing efficiency for recycled products while maintaining quality standards.
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 approach allows for continuous monitoring and maintenance of mattress quality, reducing waste by identifying and replacing only worn parts, thus extending the mattress's usability and minimizing the number of mattresses ending up as landfill or fuel.
Implementation Method 1
an adhesive that undergoes a first order solid-to liquid transition above 80°C
Implementation Method 2
the adhesive with which this part is interconnected with other parts in the assembly is heated to a temperature above its phase-transition temperature
Data Source
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Figure 3
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AI summary
The invention pertains to a method of monitoring the quality of a mattress during its lifetime, wherein the mattress is an assembly of multiple separate parts, wherein the parts are mechanically interconnected, the method comprising during its lifetime, assessing at least one property of the mattress, determining whether or not the property meets a predetermined specification, and when the property does not meet the predetermined specification, identifying a part of the said multiple separate parts that corresponds to the property, removing the identified part from the assembly and optionally replacing the removed part with a replacement part, wherein the mattress that is monitored is manufactured by forming the mechanical interconnection with an adhesive, which adhesive has a first order phase-transition temperature between 80°C and 180°C, at which temperature the adhesive undergoes a solid-liquid transition, and wherein before the said removing of the identified part, the adhesive with which this part is interconnected with other parts in the assembly is heated to a temperature above its phase-transition temperature, whereafter the identified part is grasped and pulled out of the assembly. The invention also pertains to a method of manufacturing a mattress suitable for use in this monitoring method.