Selective Grinding Eraser for Printed Sheet Material Recovery
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Solution Overview
Problem
Existing sheet processing devices grind the entire surface of recording media, including white areas, making it difficult to reuse the media effectively due to excessive material removal.
Innovation Solution
A sheet processing device equipped with a detector to identify printed areas and an eraser with a grinding tool and pressure mechanism that selectively removes only the printed areas, preventing unnecessary material loss by applying pressure through a conveyor belt and pressure elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the entire surface of the recording medium is ground to remove printed areas, then the printed areas are effectively removed, but material is wasted on white areas where nothing is recorded
Solution Approach 1:
The patent applies local quality by making the grinding tool's pressure distribution non-uniform across its surface. Specifically, the pressure mechanism increases contact pressure only in the printed area while maintaining lower pressure in white areas, enabling selective removal of printed material without grinding white areas. This resolves the contradiction by concentrating material removal precisely where needed.
Solution Approach 2:
The patent employs preliminary action through the detector that identifies printed areas before the grinding process begins. The detection result is used to pre-position or pre-adjust the pressure mechanism to apply selective pressure only on detected printed areas, ensuring that material removal is precisely targeted and waste is minimized from the outset.
2Loss of substance
If selective pressure is applied only to printed areas, then material waste is reduced, but the complexity of the pressure mechanism increases
Solution Approach 1:
The patent segments the pressure mechanism into multiple independent pressure-applying elements distributed across the grinding tool surface. Each element can be independently controlled to apply pressure only where needed based on detected printed areas. This segmentation allows selective material removal while keeping the overall system manageable through modular control.
Solution Approach 2:
The patent introduces a pressure mechanism as an intermediary between the detector and the grinding tool. This intermediary receives detection information and translates it into selective pressure distribution, acting as a mediator that enables precise control of material removal without requiring direct complex control of the entire grinding system.
3Strength
If the pressure mechanism applies pressure through the conveyor belt, then the sheet is protected from damage, but the contact pressure between the grinding tool and sheet may be insufficient
Solution Approach 1:
The conveyor belt serves as an intermediary that transmits pressure from the pressure mechanism to the sheet while protecting the sheet from direct contact with heavy grinding components. The belt distributes the applied pressure evenly and prevents concentration of force that could damage the sheet, while still enabling sufficient contact pressure for effective grinding through the belt material.
Solution Approach 2:
The conveyor belt acts as a flexible thin film that transmits pressure while conforming to the sheet surface. This flexibility allows the pressure to be distributed appropriately across the contact area, maintaining sufficient grinding pressure without creating localized stress concentrations that would damage the sheet structure.
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 allows for precise removal of printed areas without excess or deficiency, preserving more material for recycling and improving the yield of recycled paper with higher whiteness.
Implementation Method 1
a detector configured to detect a printed part printed on a sheet
Implementation Method 2
an eraser configured to selectively remove at least a surface part of a printed area including the printed part detected by the detector... a grinding tool to grind the sheet
Implementation Method 3
a pressure mechanism configured to selectively increase in the printed area contact pressure between the sheet and the grinding tool
Data Source
AI summary
Provided are a sheet processing device and a sheet manufacturing apparatus capable of removing color material from printed parts without excess or deficiency. A sheet processing device has a detector configured to detect a printed part printed on a sheet; and an eraser configured to selectively remove at least a surface part of a printed area including the printed part detected by the detector. The eraser includes a grinding tool to grind the sheet, and a pressure mechanism configured to selectively increase contact pressure between the sheet and the grinding tool in the printed area.