Sheet Roll Coupling Member with Necked Portion for Wrinkle Control
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Solution Overview
Problem
When coupling sheets together for a roll shape, misalignment of widthwise center lines leads to tension-induced wrinkles and processing failures during rolling, as existing coupling methods either concentrate tension or fail to correct misalignment effectively.
Innovation Solution
A sheet-like coupling member with wide joint portions and a narrower necked portion is used to span between adjacent sheets, allowing for torsional deformation and distributing tension across a wider area, thereby reducing wrinkle formation and reinforcing the sheet ends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive tape is attached over entire widthwise areas of both sheets to couple them together, then the coupling strength is improved, but wrinkles occur around the joint portions when the sheets are rolled due to tension acting on misaligned sheets
Solution Approach 1:
The coupling member has different width characteristics at different locations: wide joint portions at the ends for strong bonding, and a narrow necked portion in the middle to reduce wrinkle formation. This local variation in geometry allows the same component to simultaneously provide strong coupling and prevent wrinkles.
Solution Approach 2:
The coupling member is segmented into functionally distinct regions: wide joint portions for bonding and a narrow necked portion for tension relief. This segmentation allows each region to perform its specific function optimally without interfering with the other.
2Strength
If the sheets are coupled with wide joint portions only, then the coupling strength is improved, but the misalignment of widthwise center lines cannot be corrected and tension concentration causes processing failures
Solution Approach 1:
The coupling member transitions from wide joint portions to a narrow necked portion, creating local quality variation that allows both strong coupling at the joints and misalignment correction at the necked portion during the rolling process.
3Object-affected harmful factors
If a narrow coupling member is used to span between sheets, then wrinkle formation is reduced, but the coupling strength is insufficient and the sheets cannot be reliably coupled
Solution Approach 1:
The coupling member is segmented into wide joint portions for strength and a narrow necked portion for wrinkle prevention, allowing both functions to coexist in a single component.
Solution Approach 2:
Different portions of the coupling member have different width characteristics: wide at the joints for strength, narrow in the middle for wrinkle prevention, achieving both objectives simultaneously.
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 configuration minimizes wrinkle occurrence and enhances the stability of the sheet roll by distributing tension and absorbing deformation, ensuring precise rolling and processing of sheets, particularly glass films, without causing breakage.
Implementation Method 1
the sheet-like coupling member includes: wide joint portions each being joined to each of the two sheets at each of both the end portions in the rolling direction thereof; and a necked portion, which is narrower than the joint portions and is formed at a middle portion thereof in the rolling direction
Data Source
AI summary
A sheet roll comprises two glass films and a coupling portion, wherein end portions of the glass films are coupled together via the coupling portion and the coupled glass films are rolled into a roll shape. The coupling portion is a sheet-like coupling member formed of a resin film and placed on the end portions of the two glass films in a rolling direction so as to span therebetween. The sheet-like coupling member includes wide joint portions joined respectively to the end portions of the two glass films, and a necked portion which is narrower than the wide joint portions and is formed at a middle portion of the sheet-like coupling member in the rolling direction.