Roller Assembly with Edge Rollers for Patterned Substrate Transport
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Solution Overview
Problem
Conventional step rollers in roll-to-roll processing do not adequately support the middle of substrates with patterns, leading to stress and potential damage or wrinkling due to bending moments, which can result in pattern damage and improper transportation.
Innovation Solution
A roller assembly incorporating a step roller with edge rollers and auxiliary rollers, where a film is attached to the substrate as a stacked film to enhance support and prevent damage, with the film forming a closed loop through the auxiliary and step rollers, and edge rollers supporting the substrate's edges to prevent pattern contact with the rollers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional step roller is used to transport substrates with patterns, then the patterns are protected from direct contact with rollers, but the middle of the substrate is not supported causing stress and potential damage
Solution Approach 1:
The step roller is divided into multiple independent rollers (first step roller, second step roller, third step roller) arranged in sequence. Each roller segment provides localized support to different regions of the substrate, with the first and second step rollers supporting the middle portion and the third step roller supporting the downstream region. This segmentation allows distributed support across the substrate width and length, preventing stress concentration and wrinkling while maintaining pattern protection.
Solution Approach 2:
A release film is introduced as an intermediary layer between the substrate patterns and the step rollers. The release film contacts the rollers while the substrate patterns remain non-contacting, providing both pattern protection and uniform support across the substrate middle portion. The release film acts as a mediator that transfers the support function from direct roller-substrate contact to roller-film-substrate contact, eliminating stress concentration points.
2Device complexity
If the substrate middle is not supported during transport, then the structure is simpler, but stress from bending moment causes wrinkling and damage
Solution Approach 1:
The support function is segmented across multiple rollers (first, second, and third step rollers) positioned at different locations. This distributed support system provides comprehensive coverage of the substrate middle portion without requiring a single complex support structure. Each roller segment contributes to reducing bending moments through localized support, collectively preventing wrinkling and damage.
Solution Approach 2:
A release film is used as a flexible intermediary layer that conforms to the substrate and distributes support forces evenly across the substrate middle portion. The thin film structure provides uniform support without adding significant rigidity or complexity to the system, allowing the substrate to be supported along its entire length while maintaining flexibility and preventing stress concentration.
Data Source
AI summary
A roller assembly for transporting a substrate includes a step roller and a plurality of first auxiliary rollers. The step roller includes a main roller, and a pair of edge rollers sleeved on the main roller and located on two opposite ends of the main roller, respectively. The plurality of first auxiliary rollers are disposed on two opposite sides of the step roller, respectively. A first film forms a closed loop through the first film being rolled on the plurality of first auxiliary rollers and the step roller cyclically. A method using the same is also provided.