Fibrous Body Accumulating Device for Web Thickness Control
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Solution Overview
Problem
Dry sheet manufacturing apparatuses face challenges in maintaining consistent web thickness due to varying amounts of defibrated material, leading to suboptimal sheet quality, as they lack the ability to detect and adjust the material release accurately.
Innovation Solution
A fibrous body accumulating device with a detection section and an estimation section that uses detection frequency to determine the material amount in a drum, allowing for precise adjustment of material release through a rotating body, ensuring consistent web formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a dry sheet manufacturing apparatus is used to reduce apparatus size and save energy, then water consumption is reduced and energy is saved, but the web thickness distribution becomes inconsistent leading to deteriorated sheet quality
Solution Approach 1:
The patent implements a feedback control system where a detection section monitors the amount of defibrated material in the cylindrical screen in real-time, and this information is fed back to adjust the rotation speed of the rotating body. This closed-loop feedback mechanism ensures consistent material release and uniform web thickness distribution, resolving the quality issue while maintaining the energy-efficient dry manufacturing process
Solution Approach 2:
The patent dynamically changes the rotation speed parameter of the rotating body based on detected material amount. By adjusting this operational parameter in response to real-time conditions, the system optimizes material release characteristics to achieve uniform web thickness, thereby improving manufacturing precision without sacrificing the energy savings of dry manufacturing
2Productivity
If the amount of defibrated material in the cylindrical screen varies, then the release amount varies, but this leads to inconsistent web thickness and deteriorated sheet quality
Solution Approach 1:
The detection section continuously monitors material amount in the cylindrical screen and provides real-time feedback to the control system. This feedback enables dynamic adjustment of the rotating body's rotation speed to maintain optimal material release, ensuring consistent web thickness even when material accumulation varies, thus resolving the contradiction between productivity and precision
Solution Approach 2:
The system transitions from a static rotation speed to a dynamic, adaptive rotation speed that responds to real-time material conditions. The rotating body's speed is continuously adjusted based on detected material amount, creating a dynamic control mechanism that maintains optimal material release characteristics and uniform web formation throughout the manufacturing process
3Device complexity
If no detection mechanism is provided for material amount in the drum, then the device structure remains simple, but the release amount cannot be adjusted leading to poor web quality
Solution Approach 1:
The patent introduces a detection section that provides real-time information on material amount in the drum. This feedback capability enables the control system to adjust the rotating body's operation to optimize material release, achieving uniform web thickness distribution. The added detection complexity is justified by the significant improvement in manufacturing precision
Data Source
AI summary
A fibrous body accumulating device includes an accumulating section including a drum that introduces and releases a material including fibers, a detection section detecting a presence of the material in the drum, and an estimation section estimating an amount of the material in the drum based on a detection frequency at which the detection section detects the material. The fibrous body accumulating device further includes a storage section in which a calibration curve showing a relationship between the detection frequency and the amount of the material in the drum is stored, and the estimation section calculates information on the detection frequency and estimates the amount of the material in the drum with reference to the calibration curve.