Core-Sheath Water Purification Filter for Flow and Hardness
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Solution Overview
Problem
Existing water purification filters with fibrous activated carbon and biodegradable binders have low filtration flow rates and poor handleability while maintaining free residual chlorine filtration capacity.
Innovation Solution
A water purification filter using fibrous activated carbon and a heat fusible core-sheath composite fiber with a biodegradable polyester resin sheath and a synthetic resin core, heat-fused to a density of 0.12 to 0.30 g/cm³ and specific surface area of 500 to 1800 m²/g, ensuring adequate filtration flow and handleability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fibrous biodegradable binder is used to improve environmental compatibility, then biodegradability is improved, but filtration flow rate decreases
Solution Approach 1:
The patent uses core-sheath composite fibers where the core contains a high-melting-point synthetic resin (polyester or polyamide) and the sheath contains a biodegradable resin. This composite structure allows the biodegradable outer layer to provide environmental compatibility while the durable core maintains structural integrity and filtration performance, resolving the contradiction between biodegradability and filtration flow rate.
Solution Approach 2:
The patent changes the melting point parameter of the binder by selecting synthetic resins with melting points of 150°C or higher (such as polyester and polyamide) for the core portion. This high melting point parameter prevents thermal deformation during heat treatment, maintaining the three-dimensional void structure and ensuring adequate filtration flow rate while the biodegradable sheath provides environmental compatibility.
2Productivity
If fibrous activated carbon is used to increase filtration flow rate, then filtration flow rate is improved, but filter hardness decreases
Solution Approach 1:
The patent employs core-sheath composite fibers where the core made of high-melting-point synthetic resin provides structural strength and hardness, while the biodegradable sheath maintains environmental compatibility. This composite structure allows the filter to achieve both adequate hardness for handleability and sufficient filtration flow rate.
Solution Approach 2:
The patent applies different material properties to different parts of the binder fiber: the core provides structural support and hardness where needed, while the sheath provides biodegradability and flexibility. This local differentiation of material qualities allows the filter to simultaneously achieve adequate hardness and high filtration flow rate.
3Strength
If heat treatment is applied to melt biodegradable polyester resin for adhesion, then adhesion is improved, but thermal deformation occurs
Solution Approach 1:
The patent uses core-sheath composite fibers where the core contains high-melting-point synthetic resin (polyester or polyamide) that remains stable during heat treatment, preventing thermal deformation of the fiber structure. The biodegradable sheath resin melts at lower temperatures to provide adhesion between activated carbon fibers, while the stable core maintains the three-dimensional void structure.
Solution Approach 2:
The high-melting-point synthetic resin core acts as a thermal intermediary that protects the fiber structure from deformation during heat treatment. It absorbs and withstands the thermal stress, allowing the biodegradable sheath resin to melt and adhere fibers without causing structural collapse or deformation.
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 achieves a sufficient filtration flow rate and maintains free residual chlorine capacity with improved handleability and biodegradability, suitable for pot-type water purifiers.
Implementation Method 1
fibers of the activated carbon are fused to one another with the biodegradable polymer
Implementation Method 2
a sheath portion of the heat fusible core-sheath composite fiber contains a biodegradable polyester resin
Data Source
AI summary
An object of the present invention is to provide a water purification filter comprising activated carbon as a filtration material and a biodegradable polymer as a binder component, which water purification filter has a filtration flow rate sufficient for practical use as a pot-type water purifier while maintaining a certain free residual chlorine filtration capacity, and has a certain degree of hardness and excellent handleability. Provided is a water purification filter obtained by winding a nonwoven sheet containing fibrous activated carbon and a heat fusible core-sheath composite fiber and then heat fusing the sheet, wherein the heat fusible core-sheath composite fiber includes a sheath portion containing a biodegradable polyester resin having a melting point of 80 to 140° C. and a core portion containing a synthetic resin having a melting point at least 20° C. higher than the melting point of the biodegradable polyester resin, and wherein the water purification filter has a density of 0.12 to 0.30 g/cm3 and a specific surface area of 500 to 1800 m2/g.