Sieve Unit Material Retention for Sheet Manufacturing Startup
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional sheet manufacturing apparatuses, especially dry-process ones, face challenges in efficiently stopping and starting operations due to the need to discharge all material from the forming drum, which prolongs downtime and startup times.
Innovation Solution
The apparatus incorporates a sieve unit that stores defibrated material by adjusting its movement speed, allowing it to stop with material inside, which reduces downtime and accelerates startup by ensuring a continuous supply of defibrated material when operations resume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the forming drum discharges all material before stopping operation, then the sheet quality is maintained, but the stopping time and startup time are prolonged
Solution Approach 1:
The sieve unit accumulates defibrated material in advance before stopping operation. By maintaining a reserved amount of material in the sieve unit, the system prepares for quick restart without needing to wait for material accumulation, thus reducing both stopping time and startup time while ensuring consistent sheet quality.
Solution Approach 2:
The system dynamically adjusts the amount of material in the sieve unit based on operational state. During normal operation, the sieve unit maintains optimal material levels for continuous production. When stopping, it preserves sufficient material to enable immediate restart, creating a dynamic balance between material retention and operational efficiency.
2Ease of manufacture
If the sieve unit stops with all material discharged, then the equipment is clean, but the time until sheet production starts is prolonged
Solution Approach 1:
The sieve unit maintains a reserved amount of defibrated material as a preliminary preparation for potential restart. This pre-positioned material eliminates the waiting period for material accumulation during startup, allowing the system to transition quickly from stopped to producing state.
Solution Approach 2:
The system applies different material management strategies to different parts of the equipment. The forming drum discharges material for cleanliness, while the sieve unit retains material for quick restart capability, creating localized quality differences in material distribution that serve different functional purposes.
3Loss of time
If the sieve unit stops with stored material, then the stopping time and startup time are shortened, but the amount of material passing through openings decreases
Solution Approach 1:
The sieve unit stops with a partial amount of material retained rather than completely empty or fully loaded. This partial retention strikes a balance between enabling quick restart (reducing downtime) and maintaining sufficient material flow capacity (preserving productivity) when the system resumes operation.
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
This approach shortens the time required to stop and start the manufacturing process, maintaining sheet quality by ensuring a consistent supply of defibrated material, thus improving operational efficiency.
Implementation Method 1
a sieve unit having at least part of material defibrated in a defibration process introduced thereto, moving at a first speed, and passing the defibrated material through multiple openings disposed in the main section thereof
Data Source
AI summary
A sheet manufacturing apparatus that shortens the time until the apparatus stops is provided. The sheet manufacturing apparatus has a sieve unit having at least part of material defibrated in a defibration process introduced thereto, moving at a first speed, and passing defibrated material through multiple openings disposed in the main section thereof; and a forming unit forming a sheet using precipitate that past through the openings of the sieve unit; the sheet manufacturing apparatus stopping the sieve unit with defibrated material that was introduced stored inside the sieve unit when production by the sheet manufacturing apparatus stops.