Filter structure
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Solution Overview
Problem
Existing filter structures for range hoods and similar appliances are prone to burning when exposed to high flames due to the adhesive layer being flammable and spread of fire through gaps in the nonwoven fabric, despite flame retardant treatment on the fabric.
Innovation Solution
A filter structure with an adhesive layer containing 3 wt % or more of a flame retardant, preferably an organic non-halogen flame retardant, applied in a range of 10 wt % to 30 wt % and 5 g/m2 to 50 g/m2, ensuring improved flame retardance and adhesive strength, even when formed by spray coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an adhesive layer is formed on the entire one surface of the nonwoven fabric by spray coating, then the adhesive strength is improved, but the flame retardance is worsened because the adhesive is scattered over the entire surface and covers the fibers, allowing flame to spread throughout the entire nonwoven fabric
Solution Approach 1:
The adhesive layer is formed only on specific portions (peripheral portions or specific areas) of the nonwoven fabric rather than the entire surface. This localized approach maintains adequate adhesive strength for attachment while preserving the flame-retardant properties of the uncovered fabric areas, preventing complete flame spread across the entire structure.
Solution Approach 2:
The adhesive layer is divided into separate regions or applied in a segmented manner rather than as a continuous coating. This segmentation creates firebreak zones where the nonwoven fabric remains exposed and can resist flame propagation, while still providing sufficient attachment points for securing the filter structure.
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 maintains high flame retardance, prevents peeling or falling off, and ensures safe operation during high-heat conditions, such as flambe cooking, while maintaining air permeability and filtration efficiency.
Implementation Method 1
the adhesive layer contains 3 wt % or more of a flame retardant
Implementation Method 2
a filter layer made of a sheet-like member having air permeability
Data Source
AI summary
A filter structure (81) is used for filtering a gas passing therethrough by being attached to an object, and includes a filter layer made of a sheet-like member having air permeability, and an adhesive layer formed on at least a part of one surface of the filter layer and configured to attach to the object. The adhesive layer contains 3 wt % or more of a flame retardant. With such a configuration, flame retardance is imparted to the adhesive layer, and thus it is possible to improve flame retardance of the entire filter structure (81).