Wood Shaving-Cellulose Insulation for Low Thermal Conductivity
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Solution Overview
Problem
Existing thermal insulation materials face challenges in achieving good insulation properties while being cost-effective and ecologically sustainable, particularly in terms of thermal conductivity and settling density.
Innovation Solution
A thermal insulation material composed of wood shavings and cellulose fibers from decor or sanitary paper, where the wood shavings are produced by chipping moist wood using a conical face milling cutter, and the cellulose fibers are mixed with the wood shavings in a moist state to enhance embedding and reduce thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wood chips and cellulose fibers are loosely mixed to form thermal insulation material, then the material can be produced from easily available starting materials, but the thermal conductivity is not sufficiently low and settling density is high
Solution Approach 1:
The patent changes the physical state parameter of wood shavings from dry to moist (residual moisture at least 15%). This parameter change allows the wood shavings to better embed cellulose fibers in the voids between them, creating a more effective insulation structure with lower thermal conductivity while maintaining ease of production from available materials
Solution Approach 2:
The patent creates a composite material system combining wood shavings (first insulating component) and cellulose fibers from decor or sanitary paper (second insulating component). This composite structure leverages the complementary properties of both materials: wood shavings provide structural framework while cellulose fibers fill voids, achieving superior insulation properties compared to either material alone
2Ease of manufacture
If wood shavings are produced by conventional chipping methods, then production is simple, but settling density is high and insulation properties are insufficient
Solution Approach 1:
The patent changes the moisture parameter of wood shavings to at least 15% residual moisture after chipping. This parameter change prevents excessive settling and maintains lower settling density while improving the embedding of cellulose fibers, thereby enhancing insulation properties without complicating the production process
3Stability of the object's composition
If cellulose fibers with long fiber length are used, then the material structure is more continuous, but mixing with wood shavings is less effective and void filling is reduced
Solution Approach 1:
The patent specifies that cellulose fibers should have a maximal fiber length of 12 mm, creating local optimization where fibers are long enough to provide structural stability but short enough to effectively mix with and embed in the voids between wood shavings. This localized dimension control improves both mixing effectiveness and void filling while maintaining structural continuity
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 material achieves excellent insulating properties with a low settling density and reduced thermal conductivity, using readily available and inexpensive materials, while minimizing the need for additional drying steps and reducing the required amount of flame retardants.
Implementation Method 1
the cellulose fibers are arranged in voids formed between the wood shavings
Data Source
AI summary
A thermal insulation material is made of a plurality of insulating components. The plurality of insulating components includes a first insulating component made of wood shavings. The plurality of insulating components includes a second insulating component made of cellulose fibers, wherein the cellulose fibers are arranged in voids formed between the wood shavings. The cellulose fibers of the second insulating component are produced from decor paper or sanitary paper.