Sheet Crease Depth and Grammage for Conveyance Reliability
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Solution Overview
Problem
Conveyance failures occur in sheet conveying systems due to hooking between creases, and excessive crease depth leads to break-at-crease issues, affecting the formation of flat file folders and other three-dimensional structures.
Innovation Solution
The sheet is designed with creases that are 40 to 90 μm in depth and extend perpendicular to the conveying direction, preventing hooking while allowing easy folding, using a grammage of 200 to 370 g/m² to balance conveyance and folding integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If crease depth is increased to enable easy folding, then folding ease is improved, but conveyance reliability deteriorates due to hooking between creases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the crease depth within 90 μm or less and selecting specific grammage ranges (200-370 g/m²). This quantitative parameter optimization resolves the contradiction by finding the optimal depth that provides sufficient folding ease while preventing excessive depth that would cause hooking and conveyance failures.
2Strength
If sheet grammage is increased to improve structural integrity, then strength is improved, but conveyance reliability deteriorates due to increased friction and hooking
Solution Approach 1:
The patent applies parameter changes by specifying an optimal grammage range of 200-370 g/m². This parameter optimization balances the sheet's structural integrity needed for folding with the friction characteristics required for reliable conveyance, preventing both conveyance failures and break-at-crease issues.
3Reliability
If crease depth is decreased to prevent hooking, then conveyance reliability is improved, but folding ease deteriorates
Solution Approach 1:
The patent applies parameter changes by establishing the optimal crease depth threshold of 90 μm or less. This precise parameter control ensures the crease is shallow enough to prevent hooking during conveyance while maintaining sufficient depth to provide folding ease, resolving the contradiction between conveyance reliability and folding ease.
4Strength
If sheet thickness is increased to prevent break-at-crease, then strength is improved, but conveyance reliability deteriorates due to increased friction
Solution Approach 1:
The patent applies parameter changes by selecting specific grammage ranges (200-370 g/m²) that optimize the balance between sheet strength and friction characteristics. This parameter optimization ensures the sheet is thick enough to resist break-at-crease while maintaining low enough friction for reliable conveyance.
Data Source
AI summary
An embodiment of the invention is directed to a sheet, wherein a conveying direction of the sheet relative to a sheet conveying apparatus is determined; the sheet is formed with a crease along which to fold the sheet and that is smaller than or equal to 90 μM in depth and extends in a direction that crosses the conveying direction; and a grammage of the sheet is in a range of 200 to 370 g/m2.