Curved Air Transfer Path for Sheet Thickness Control
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Solution Overview
Problem
In sheet manufacturing, it is challenging to maintain uniform thickness due to the difficulty in measuring the transfer weight of defibrated material, which is light and fibrous, leading to inconsistent material management.
Innovation Solution
A sheet manufacturing apparatus with a transfer path that includes a curved section and an optical detecting unit positioned downstream, utilizing centrifugal force to draw the material towards one side, allowing for accurate detection of material presence and weight management, and an adjustable threshold for the optical detecting unit to maintain detection accuracy as the apparatus ages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the defibrated material is transferred in air using a straight transfer path, then the material can be transferred continuously, but the material cannot be effectively detected by optical detecting units because it is dispersed throughout the transfer path
Solution Approach 1:
The transfer path is designed with a curved section that causes the defibrated material to be drawn together at one side through centrifugal force. This curvature transforms the dispersed material distribution into a concentrated stream, enabling effective optical detection while maintaining continuous transfer capability.
2Reliability
If the optical detecting unit is positioned upstream at the curved section, then material detection is enabled, but the detection reliability decreases as the apparatus ages due to accumulated material on the transfer path
Solution Approach 1:
The system incorporates a control unit that receives detection signals from the optical detecting unit and adjusts the threshold for determining material presence based on accumulated usage data. This feedback mechanism compensates for gradual changes in detection characteristics caused by material accumulation on the transfer path, maintaining reliable detection accuracy over time.
3Measurement precision
If the transfer path is made transparent for optical detection, then material detection is enabled, but material accumulates on the transfer path over time reducing detection accuracy
Solution Approach 1:
The control unit continuously monitors detection signals and adjusts thresholds based on accumulated usage patterns. This feedback mechanism compensates for the gradual reduction in light transmission caused by material accumulation on the transparent transfer path, maintaining consistent detection accuracy throughout the apparatus operational life.
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 reliable detection of material presence and weight, ensuring consistent material transfer and reducing measurement errors over time, thereby facilitating the production of sheets with uniform thickness.
Implementation Method 1
an optical detecting unit configured to detect the material and provided at the curved section or at the transfer path more to a downstream side than the curved section in a transfer direction in which the material is transferred
Implementation Method 2
light which is emitted from the optical detecting unit is transmitted through at least a portion of the transfer path
Implementation Method 3
The material which is being transferred is transferred so as to be drawn together at one side of the transfer path due to centrifugal force at the curved section or at the transfer path more to the downstream side than the curved section in the material transfer direction
Data Source
AI summary
A sheet manufacturing apparatus includes a transfer path through which flows at least a portion of a material for a sheet in air and which has a curved section where the transfer path is curved, and a forming unit configured to form the sheet using the material, and an optical detecting unit configured to detect the material and provided at the curved section or at the transfer path more to a downstream side than the curved section in a material transfer direction.