Appliance with cellulose-based insulator
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Solution Overview
Problem
Existing noise reduction solutions for appliances, such as lightweight polymer facings, are ineffective in attenuating low frequency noise due to size constraints and often fail to meet flammability standards, limiting their practical application.
Innovation Solution
A cellulose-based insulator with a basis weight of 80 g/m2 to 540 g/m2 and airflow resistance of 500 mks rayls to 2,500 mks rayls, combined with a flame retardant, is used to effectively attenuate low frequency noise while meeting stringent fire resistance requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If thick insulation is used to attenuate low frequency noise, then noise reduction is improved, but appliance size increases
Solution Approach 1:
The patent changes the physical parameters of the insulation material by using cellulose-based material with specific basis weight (80-540 g/m²) and airflow resistance (500-2500 mks rayls). This material achieves superior low frequency noise attenuation per unit thickness compared to conventional materials, allowing thin insulation layers to effectively reduce noise without increasing appliance volume.
Solution Approach 2:
The patent employs composite material construction by combining cellulose-based insulating material with flame retardant additives. This composite approach creates a multi-functional material that simultaneously provides acoustic insulation, thermal insulation, and fire resistance, replacing the need for multiple separate material layers and achieving space-efficient noise reduction.
2Object-affected harmful factors
If heavier polymer facing material is used to improve noise attenuation, then noise reduction is improved, but flammability standards are not met
Solution Approach 1:
The patent creates a composite material system by integrating flame retardant substances into the cellulose-based insulation material. This composite structure maintains the acoustic performance of the insulation while the flame retardant components provide fire resistance, enabling the material to simultaneously satisfy both noise attenuation requirements and flammability standards (UL94 V-0, HB, or 5VA).
Solution Approach 2:
The patent modifies the chemical and physical parameters of the insulation material by incorporating flame retardants, which change the material's combustion characteristics. This parameter modification allows the material to achieve appropriate fire resistance ratings while preserving its acoustic insulation properties, resolving the contradiction between noise reduction and fire safety.
3Ease of manufacture
If lightweight polymer facing is used to reduce appliance weight, then ease of manufacture is improved, but low frequency noise attenuation is insufficient
Solution Approach 1:
The patent optimizes the parameters of the insulation material by selecting cellulose-based material with specific basis weight and airflow resistance characteristics. This material achieves high noise attenuation effectiveness for low frequency sounds while maintaining lightweight properties and manufacturing simplicity, unlike heavier materials that would be required to achieve the same acoustic performance with conventional materials.
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 cellulose-based insulator significantly reduces low frequency noise and exhibits excellent fire resistance, making it suitable for various appliances without the size and manufacturing limitations of previous solutions.
Implementation Method 1
a cellulose-based insulator that attenuates low frequency noise
Implementation Method 2
the cellulose-based insulator insulates at least a portion of the housing
Data Source
AI summary
An appliance is provided. The appliance includes a cellulose-based insulator. The cellulose-based insulator has a basis weight of 80 g/m2 to 500 g/m2 and an airflow resistance of 500 mks rayls to 2,500 mks rayls. The cellulose-based insulator attenuates low frequency noise and exhibits excellent fire resistance.