Multi-Layer Fiber Sheet Manufacturing with Independent Density Control
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Solution Overview
Problem
Existing sheet manufacturing apparatuses lack the ability to adjust density and material type within the thickness direction of sheets and cannot change the state or material type of each layer during the manufacturing process.
Innovation Solution
A sheet manufacturing apparatus that allows for different processing conditions, such as pressurizing and heating, for each layer during the lamination process, using separate processing units for each web to control density and material distribution, enabling the creation of sheets with varied properties across layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a roller that heats the web pressurizes the web to manufacture a sheet, then the sheet is manufactured with uniform density in the thickness direction, but the ability to adjust density and material distribution in the thickness direction is lost
Solution Approach 1:
The heating and pressurizing functions are divided into separate units: a heating unit that heats the web without pressurizing it, and a pressurizing unit that applies pressure to the heated web. This segmentation allows independent control of heating and pressurizing parameters, enabling density adjustment in the thickness direction while maintaining manufacturing precision.
Solution Approach 2:
The pressurizing unit applies different pressures to different regions of the web in the thickness direction, creating local variations in density. This enables the manufacture of sheets with non-uniform density distributions tailored to specific functional requirements, while the heating unit provides uniform thermal processing.
2Adaptability or versatility
If separate processing units are used for each web to control density and material distribution, then sheets with varied properties across layers can be manufactured, but the device complexity increases
Solution Approach 1:
Multiple processing functions (heating, pressurizing, laminating) are merged into an integrated processing line where webs are processed sequentially through shared infrastructure components. This reduces overall system complexity while maintaining the capability for independent control of each layer's properties through coordinated operation of the heating and pressurizing units.
Solution Approach 2:
The processing units are designed with adjustable and variable parameters that can be dynamically controlled during operation. The heating unit can vary temperature and duration, while the pressurizing unit can adjust pressure levels and application timing, enabling flexible control of layer properties without requiring separate fixed-function devices for each parameter.
3Productivity
If the web is heated and pressurized simultaneously, then the processing time is reduced, but the ability to independently control heating and pressurizing parameters is lost
Solution Approach 1:
The heating unit processes the web in advance before the pressurizing unit acts on it. This preliminary heating action prepares the material for subsequent pressurizing by softening it and making it more responsive to pressure application. The sequential arrangement maintains parameter independence while achieving efficient overall processing through optimized staging of operations.
Solution Approach 2:
The heating and pressurizing units are arranged to operate in continuous sequence, with the heated web immediately proceeding to the pressurizing unit. This continuous flow eliminates idle time between heating and pressurizing operations, maintaining high productivity while preserving the ability to independently optimize each processing parameter for the specific material and product requirements.
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 the production of sheets with tailored density, thickness, and material properties for each layer, enhancing the versatility and functionality of the final product.
Implementation Method 1
by heating a web on which two mixtures having different proportions of the fibers and the functional material are deposited
Implementation Method 2
a roller that heats the web pressurizes the web and increases the density
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A sheet manufacturing apparatus includes: a web forming unit that includes a first depositing unit which forms a first web by depositing a first mixture containing fibers and a second depositing unit which forms a second web by depositing a second mixture containing fibers on the first web, and that forms a web for processing; and a processing unit that manufactures a sheet by performing processing including heating with respect to the web for processing formed by the web forming unit.