Defibration Speed Control for Static-Free Fiber Sheet Formation
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Solution Overview
Problem
Dry-method sheet manufacturing apparatuses face issues with static electricity-generated fiber clumping, leading to uneven sheet thickness and reduced quality due to inadequate control over defibration processes.
Innovation Solution
A web manufacturing apparatus with a defibration section, detection section for electric charge, and control section that adjusts the rotating blade's revolution speed based on detected charge amounts or input information to prevent clumping, ensuring uniform fiber dispersion and sheet formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a dry-method defibration machine is used to defibrate fibers, then the apparatus becomes more compact and consumes less energy, but static electricity causes fibers to clump together resulting in uneven sheet thickness
Solution Approach 1:
The control section receives detection results from the detection section about electric charge amounts and dynamically adjusts the revolution speed of the rotating blade accordingly. This feedback mechanism enables real-time optimization of defibration conditions to prevent fiber clumping while maintaining dry-method energy efficiency
Solution Approach 2:
The revolution speed of the rotating blade is made variable rather than fixed. The control section adjusts the revolution speed based on detected electric charge amounts or input information about material conditions, allowing dynamic optimization of defibration intensity to control static electricity generation while maintaining productivity
2Productivity
If the revolution speed of the rotating blade is increased to improve productivity, then more material can be processed, but static electricity generation increases causing more severe fiber clumping
Solution Approach 1:
The revolution speed is dynamically adjusted based on detected electric charge amounts. When static electricity levels are high, the control section reduces the revolution speed to decrease static generation. When conditions allow, the speed can be increased to maintain productivity. This dynamic control resolves the contradiction between processing speed and static electricity generation
Solution Approach 2:
The control section changes the operational parameter (revolution speed) based on detected conditions or input information about material properties. By adjusting this parameter, the system optimizes the balance between processing efficiency and static electricity control for different material conditions
3Object-generated harmful factors
If the revolution speed is reduced to decrease static electricity, then fiber clumping is reduced, but processing capacity and productivity decrease
Solution Approach 1:
Rather than maintaining a constantly low revolution speed, the system dynamically adjusts speed based on real-time detection or material conditions. This allows the system to operate at higher speeds when static electricity is not problematic and reduce speed only when necessary, maintaining overall productivity while controlling static electricity
Solution Approach 2:
The detection section provides feedback about electric charge amounts, enabling the control section to make informed decisions about when to reduce revolution speed. This feedback-based control ensures that productivity is maintained at maximum levels except when detection indicates static electricity problems require speed reduction
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 solution effectively suppresses static electricity-induced clumping, resulting in high-quality sheets with uniform thickness by dynamically controlling the defibration process, prioritizing either quality or productivity through different operational modes.
Implementation Method 1
a defibration section (13) that includes a rotating blade (131) and is configured to defibrate a material containing fiber
Implementation Method 2
a detection section (29) configured to detect an electric charge amount of a defibrated material (M3) obtained by the defibration section (13)
Implementation Method 3
fibers sometimes generate static electricity when defibrated using a dry-method defibration machine
Data Source
AI summary
A web manufacturing apparatus includes a defibration section that includes a rotating blade and is configured to defibrate a material containing fiber, a detection section configured to detect an electric charge amount of a defibrated material obtained by the defibration section, and a control section configured to control operation of the defibration section. The control section includes a first mode in which a revolution speed of the rotating blade is set based on a detection result of the detection section.