Sheet Manufacturing Apparatus with Rotary Dividing Unit
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Solution Overview
Problem
Existing sheet manufacturing apparatuses face issues with non-uniform density and thickness due to fiber clogging in the screening process, leading to inefficient use of water and energy in wet-type systems and inconsistent paper production in dry-type systems.
Innovation Solution
A sheet manufacturing apparatus comprising a defibrating unit, screening unit, web forming unit, dividing unit, deposition unit, and forming unit, which includes a rotary body with protrusion units and airflow generation for uniform deposition and peeling, controlling the rotational speed and airflow to prevent clogging and ensure uniform distribution of fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a screen having small holes is used for fiber screening, then fiber separation is improved, but fiber clogging occurs and manufacturing precision deteriorates
Solution Approach 1:
The web is divided into multiple subdivided bodies by the dividing unit before deposition. This segmentation prevents excessive fiber accumulation at any single deposition location, reducing the risk of screen clogging while maintaining effective fiber separation through the small holes of the screen.
Solution Approach 2:
The web forming unit and dividing unit operate dynamically to control fiber distribution. The web is continuously formed and then divided into multiple portions that are sequentially deposited, creating a dynamic balance between fiber separation efficiency and clogging prevention.
2Manufacturing precision
If wet-type defibrating is used, then fiber separation is improved, but water consumption and apparatus size increase
Solution Approach 1:
The patent replaces the wet mechanical defibrating system with a dry-type defibrating system. The dry-type defibrating unit achieves fiber separation through mechanical action without water, and the subsequent web forming and dividing units maintain fiber uniformity through controlled deposition and division, eliminating water consumption while preserving defibration quality.
3Quantity of substance
If dry-type defibrating is used, then water consumption is reduced, but fiber uniformity deteriorates due to clogging
Solution Approach 1:
The dividing unit segments the formed web into multiple subdivided bodies, which are then deposited in a distributed manner. This segmentation ensures uniform fiber distribution across the deposition screen, preventing localized clogging and maintaining consistent sheet density and thickness without requiring water.
Solution Approach 2:
The web is formed and divided into multiple subdivided bodies before deposition onto the screen. This preliminary action of division prevents excessive fiber accumulation during deposition, ensuring uniform distribution and preventing clogging before it occurs, thereby maintaining sheet uniformity in the dry-type process.
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 apparatus achieves high uniformity in sheet density and thickness by preventing fiber entanglement and clogging, reducing energy consumption, and improving the efficiency of the dry-type process.
Implementation Method 1
a peeling unit configured to peel the web deposited on the deposition surface from the deposition surface
Implementation Method 2
a forming unit configured to form the sheet by pressurizing and heating the defibrated material deposited by the deposition unit
Implementation Method 3
a forming unit configured to form the sheet by pressurizing and heating the defibrated material
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A sheet manufacturing apparatus includes a defibrating unit configures to defibrate a raw material containing fiber into a defibrated material; a screening unit configured to screen the defibrated material that is defibrated by the defibrating unit; a web forming unit configured to form a web on which the defibrated material screened by the screening unit is deposited; a rotary body that includes a protrusion unit for forming a subdivided body by dividing the web formed by the web forming unit; a deposition unit configures to deposit the defibrated material configuring the subdivided body; and a forming unit configured to form the sheet by pressurizing and heating the defibrated material deposited by the deposition unit.