Filter structure
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Solution Overview
Problem
Existing filter structures for air conditioning and range hood applications face issues with adhesiveness at varying temperatures, leading to potential separation from metal filters and adhesive residue when used in low-temperature environments.
Innovation Solution
A filter structure with an adhesive layer formed from an acrylic hot-melt adhesive, optimized to maintain a specific ratio of maximum peeling load at 25°C to 5°C, ensuring stable adhesion across different temperature conditions without separation or residue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the adhesiveness of the acrylic hot-melt adhesive is improved at low temperature, then the filter structure does not separate from the metal filter in cold season, but adhesive residue occurs when the filter structure is peeled off after being attached at room temperature
Solution Approach 1:
The patent applies parameter changes by precisely controlling the glass transition temperature (Tg) of the acrylic hot-melt adhesive within -30°C to -60°C and adjusting the adhesive layer thickness to 2-10 μm. These parameter modifications enable the adhesive to maintain appropriate adhesion at low temperatures while ensuring clean removal at room temperature, resolving the contradiction between low-temperature reliability and residue prevention
Solution Approach 2:
The patent uses composite materials by combining acrylic polymer with specific plasticizers and modifiers to create a hot-melt adhesive with tailored properties. The composite formulation includes acrylic resin base, plasticizer for low-temperature flexibility, and adhesion promoters, achieving both low-temperature bonding strength and room-temperature removability
2Reliability
If the filter structure is attached to a metal filter in a low temperature environment, then the filter structure may separate from the metal filter due to decreased adhesiveness, but improving adhesiveness causes adhesive residue
Solution Approach 1:
The patent changes the thermal parameters of the adhesive system by setting the glass transition temperature between -30°C to -60°C and controlling the adhesive layer thickness at 2-10 μm. This enables the adhesive to remain flexible and adhesive at low attachment temperatures while being easily removable at room temperature, resolving the contradiction between attachment stability and ease of removal
3Strength
If the adhesiveness of the adhesive is significantly improved at low temperature, then separation of the filter structure is prevented in the cold season, but a part of the adhesive remains stuck to the metal filter side when peeled off at room temperature
Solution Approach 1:
The patent applies parameter changes by controlling the glass transition temperature to -30°C to -60°C and adhesive layer thickness to 2-10 μm. These precise parameter settings ensure sufficient bonding strength at low temperatures while allowing complete adhesive removal at room temperature, preventing adhesive material loss
Solution Approach 2:
The adhesive layer is designed with controlled thickness (2-10 μm) and specific composition to function as a temporary bonding agent that fulfills its purpose during installation and normal use, then completely removes without residue when the filter is replaced, embodying the disposable principle
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 filter structure achieves reliable attachment to metal filters under both normal and low-temperature conditions, preventing separation and adhesive residue, thus ensuring consistent performance and ease of removal.
Implementation Method 1
an adhesive layer that is formed on at least a part of one surface of the filter layer and is configured to be adhered to the object. The adhesive layer is formed of an acrylic hot-melt adhesive
Data Source
AI summary
Provided is a filter structure for filtering passing gas by being adhered to an object. The filter structure includes: a filter layer including a sheet-shaped member having air permeability; and an adhesive layer that is formed on at least a part of one surface of the filter layer and is configured to be adhered to the object. The adhesive layer is formed of an acrylic hot-melt adhesive, has a ratio K1/K2 of a maximum peeling load K1 at 25° C. to a maximum peeling load K2 at 5° C. in a range of 1 to 6, and the filter structure does not separate from the object when adhered to the object under a temperature condition of 25° C. or 5° C.