Natural-Fiber Soundproof Sheet Density Control by Melt Bonding
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Solution Overview
Problem
Existing soundproof sheets with natural fibers and resin face challenges in controlling the internal structure, leading to increased tact time and manufacturing complexity, which affects cost.
Innovation Solution
A method involving mixing natural fibers with a core portion and a coating layer having different melting points, followed by controlled heating, pressurizing, and cooling steps to solidify the coating layers, allowing for easy control of the internal structure and density of the soundproof sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If each material is accumulated so as to gradually vary the content ratio to produce a fiber accumulated material, then the internal structure can be controlled, but the tact time increases and manufacturing complexity increases
Solution Approach 1:
The fiber accumulated material is divided into multiple layers, each layer containing fibers with specific material compositions. By controlling the layer configuration rather than continuously varying content ratios, the internal structure is controlled while simplifying the manufacturing process. Each layer can be formed independently and then stacked, reducing manufacturing complexity.
Solution Approach 2:
Fibers are pre-coated with resin before accumulation. The coating is applied in advance to individual fibers or fiber bundles, and then these pre-coated fibers are accumulated in specific patterns to form layers. This preliminary coating action simplifies the overall manufacturing process compared to trying to control content ratios during the accumulation process itself.
2Manufacturing precision
If each material is accumulated so as to gradually vary the content ratio to produce a fiber accumulated material, then the internal structure can be controlled, but the tact time increases
Solution Approach 1:
The continuous accumulation process is segmented into discrete layer formation steps. Each layer is formed with a specific fiber composition, and layers are stacked sequentially. This segmentation allows for more efficient processing compared to continuous gradual variation, reducing the time required to achieve controlled internal structures.
Solution Approach 2:
The fiber composition is controlled by changing discrete parameters (which types of fibers are used in which layers) rather than continuously varying the content ratio. This parameter-based control approach enables faster manufacturing while still achieving precise internal structure control, as it avoids the time-consuming continuous adjustment process.
3Reliability
If natural fibers and resin are mixed in a fiber base material, then soundproofing is achieved, but the manufacturing cost increases due to complex processes
Solution Approach 1:
Resin coating is applied to fibers in advance before accumulation. This preliminary action ensures proper resin distribution and bonding capability is established before the fibers are assembled into the final structure. This approach maintains soundproofing performance while simplifying the manufacturing process and reducing costs by avoiding complex post-assembly resin application processes.
Solution Approach 2:
The material is organized into discrete layers with specific fiber-resin compositions. This segmentation allows for optimized soundproofing in each layer while using cost-effective manufacturing processes for each layer. The layered structure achieves reliable soundproofing performance without requiring complex continuous variation processes that would increase manufacturing costs.
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
Enables efficient production of soundproof sheets with adjustable density and improved sound insulation characteristics by simplifying the manufacturing process and reducing costs.
Implementation Method 1
heating the first accumulated fiber body to melt the first coating layer
Implementation Method 2
cooling the first accumulated fiber body to solidify the first coating layer while still applying the predetermined compressive force
Data Source
AI summary
A method of manufacturing a soundproof sheet includes a first accumulating step of producing a web in which a plurality of first fibers, which are natural fibers, and a plurality of second fibers including a first core portion and a first coating layer coating the first core portion and having a first melting point are mixed, a heating step of heating the web to melt the first coating layer, a pressurizing step of applying a predetermined compressive force to the web in a state where the first coating layer is melted, and a pressurized cooling step of cooling the web to solidify the first coating layer while still applying the predetermined compressive force.