Mesh Separation Nozzle for Low-Power Fiber Collection
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Solution Overview
Problem
Existing separation devices require increased power consumption and device size to effectively peel off and collect defibrated materials, leading to inefficiencies.
Innovation Solution
A separation device with a rotating member featuring a mesh surface, a first ejection portion, a first suction portion, a second ejection portion, and a second suction portion, including a nozzle with a unique cross-sectional area design that reduces the need for increased air flow, allowing efficient collection of defibrated materials without increasing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the amount of air ejected from the second ejection portion is increased to reliably peel off and collect defibrated material from the rotating mesh, then the collection efficiency of defibrated material is improved, but the power consumption increases and the device size increases
Solution Approach 1:
The patent changes the physical parameters of the air ejection system by introducing a nozzle with a specific structure (first portion with decreasing cross-sectional area and second portion with constant larger area). This parameter change allows the air to achieve higher velocity without increasing the volume of air ejected, thereby improving collection efficiency while maintaining low power consumption
Solution Approach 2:
The patent employs dynamic action by ejecting air in pulses or at specific timing moments during the rotation of the mesh, rather than continuous ejection. This dynamic approach allows efficient peeling off of defibrated material at optimal moments while reducing overall air consumption and power requirements
2Productivity
If the amount of air ejected from the second ejection portion is increased to reliably peel off and collect defibrated material from the rotating mesh, then the collection efficiency of defibrated material is improved, but the device size increases
Solution Approach 1:
The nozzle structure with its specific geometric parameters (decreasing cross-sectional area in first portion, constant larger area in second portion) enables high-velocity air ejection without requiring a larger blower or air supply system, thus avoiding device size increase while achieving improved collection efficiency
3Productivity
If a larger blower is prepared to supply more air to the second ejection portion, then the collection efficiency of defibrated material is improved, but the device size increases
Solution Approach 1:
Instead of increasing the size of the blower, the patent changes the parameters of the air delivery system by introducing a specially designed nozzle that converts the air flow into a high-velocity jet. This allows the same blower size to achieve better collection efficiency through improved air flow characteristics rather than increased air volume
Solution Approach 2:
The patent substitutes the mechanical approach of using a larger blower with a fluid dynamics approach using a properly designed nozzle. The nozzle leverages fluid mechanics principles (velocity-pressure conversion, jet effect) to achieve the desired effect without increasing the mechanical size of the air supply system
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 device efficiently separates and collects defibrated materials while maintaining a compact size and reducing power consumption, ensuring high-quality material output for sheet manufacturing.
Implementation Method 1
the second ejection portion includes a nozzle having a first portion and a second portion, the first portion being a portion in which a cross-sectional area of a lumen decreases toward the second ejection port
Data Source
AI summary
A separation device includes: a defibrating section that defibrates a material containing a fiber; and a separation section that includes a rotating member, a first ejection portion, a first suction portion, a second ejection portion, and a second suction portion, the rotating member being at least partially composed of a mesh, the first ejection portion ejecting a defibrated material generated in the defibrating section onto a first surface, the first suction portion sucking the defibrated material via the mesh to remove foreign matter, the second ejection portion having a second ejection port that ejects air toward the defibrated material from which the foreign matter on the first surface has been removed, the second suction portion sucking and collecting the defibrated material peeled off from the mesh by the air ejected from the second ejection port, in which the second ejection portion includes a nozzle having a first portion and a second portion, the first portion being a portion in which a cross-sectional area of a lumen decreases toward the second ejection port, the second portion being provided on an opposite side of the first portion to the second ejection port and being a portion in which the cross-sectional area of the lumen is larger than an opening area of the second ejection port and is constant along a tube axis.