Activated Carbon Sheet for Vehicle Air Purification
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Solution Overview
Problem
Existing activated carbon sheets for air purification in vehicle passenger compartments have inadequate toluene adsorption capacity and poor flame retardancy, with previous solutions compromising one property for the other.
Innovation Solution
Incorporating activated carbon fibers along with granular or powdered activated carbon and fibrillated fibers, with specific mass ratios and properties to enhance both toluene adsorption capacity and flame retardancy, while maintaining low pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If granular or powdered activated carbon is used to improve toluene adsorption capacity, then toluene adsorption capacity is improved, but flame retardancy deteriorates
Solution Approach 1:
The invention uses a composite structure consisting of activated carbon granules or powder embedded in a foam body, creating a material that combines the high adsorption capacity of activated carbon with the flame retardant properties of the foam matrix. This composite approach allows both toluene adsorption and flame retardancy to coexist without compromising either property.
2Reliability
If halogen- or phosphorus-based flame retardant is added to improve flame retardancy, then flame retardancy is improved, but toluene adsorption capacity deteriorates
Solution Approach 1:
The foam body acts as an intermediary carrier that provides flame retardancy without directly interfering with the activated carbon's adsorption function. The foam matrix serves as a structural backbone that supports the activated carbon granules while contributing flame retardant properties, allowing both functions to operate independently and effectively.
3Reliability
If activated carbon fiber is used as flame retardant component, then both toluene adsorption capacity and flame retardancy are achieved, but device complexity increases
Solution Approach 1:
The activated carbon fiber serves multiple functions simultaneously: it acts as both a flame retardant component and an adsorbent material. This multi-functionality reduces the need for separate components, thereby simplifying the overall structure while achieving both flame retardancy and adsorption capacity.
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 resulting activated carbon sheet achieves excellent toluene adsorption capacity and flame retardancy, suitable for use in vehicle passenger compartments, with improved safety and effectiveness in air purification.
Implementation Method 1
an activated carbon sheet for air purification comprising an activated carbon fiber, granular or powdered activated carbon, and a fibrillated fiber
Data Source
AI summary
The present invention relates to an activated carbon sheet, and particularly relates to an activated carbon sheet for air purification comprising activated carbon, which is suitable for removing volatile organic compounds in the passenger compartment of an automobile or the like. An object of the present invention is to provide a sheet that is excellent in toluene adsorption capacity and flame retardancy. An activated carbon sheet for air purification comprising an activated carbon fiber, granular or powdered activated carbon, and a fibrillated fiber, wherein a mass (g/m2) of the activated carbon fiber is 5 g/m2 or more, a pressure loss as measured by a method set forth below is 150 Pa or less, and a burn distance as measured by the FMVSS 302 burning test is 51 mm or less: <pressure loss test method> the method is conducted in accordance with JIS B 9927:1999 “Appendix (Standard) Cleanroom—Air filters—Test methods”, 3.2 “Pressure Loss Test” as follows: a piece of the activated carbon sheet cut in the form of a circle with a diameter of 110 mm is used as a measurement sample; air is sucked though the measurement sample at a linear velocity of 0.1 m/s, and a difference in static pressure between an upstream side and a downstream side of the activated carbon sheet is measured with a differential pressure gauge; and figures up to the one's place of the measured value are used as significant figures.