Roll-to-roll printing control for nanometer resolution

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Solution Overview

Problem

Current roll-to-roll printing systems face challenges in scaling up nanometer-resolution contact printing technologies for industrial applications, as they are limited by diffraction and cannot efficiently produce high-resolution patterns at a practical scale.

Innovation Solution

A multiple degrees of freedom control apparatus for a roll-to-roll printing system, featuring monolithic flexures and activators to control the print roller in various degrees of freedom, combined with a method of transferring patterns from a silicon wafer to a PDMS-coated print roller using elastomeric stamps, enabling precise control and bonding for improved printing resolution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If traditional roll-to-roll printing systems (gravure or flexographic) are used for industrial production, then productivity is improved, but manufacturing precision deteriorates due to diffraction limitations

Engineering Contradiction:

Improveindustrial production throughputVSAvoidprinting resolution

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent replaces traditional optical lithography systems with a mechanical contact printing system using a print roller that physically contacts the substrate. This mechanical approach eliminates diffraction limitations while maintaining high-speed roll-to-roll production capabilities, achieving both high productivity and nanometer-scale manufacturing precision

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention changes the fundamental printing parameter from optical projection to direct mechanical contact. By using a compliant print roller with controlled contact pressure (0.1-10 N), the system achieves nanometer-resolution patterning while maintaining industrial production speeds, resolving the contradiction between throughput and precision

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If contact printing techniques are used to achieve nanometer-resolution patterns, then manufacturing precision is improved, but device complexity increases when scaling to roll-to-roll systems

Engineering Contradiction:

Improvenanometer-resolution patterningVSAvoidsystem complexity for industrial scaling

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent divides the print roller into modular components including a roller body, compliant layer, and patterned stamp section. This segmentation allows independent optimization of each component and simplifies the overall system architecture for roll-to-roll implementation while maintaining nanometer-resolution capability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention uses a compliant print roller with a flexible elastomeric layer that can conform to substrate variations. This flexibility simplifies the need for complex alignment and positioning systems, reducing device complexity while achieving high-resolution contact printing at industrial scale

Inventive Principle:

Principle #30Flexible shells and thin films

3Ease of operation

If the print roller maintains constant contact pressure, then ease of operation is improved, but manufacturing precision deteriorates due to inability to control contact pressure variations

Engineering Contradiction:

Improveprint roller controlVSAvoidcontact pressure control

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The patent implements dynamic contact pressure control through active mechanisms that adjust the print roller's contact force in real-time. This dynamic adjustment capability maintains ease of operation while achieving precise control over contact pressure (0.1-10 N) to ensure consistent nanometer-resolution patterning across the substrate

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention incorporates feedback mechanisms that monitor contact pressure and adjust the print roller positioning or force application accordingly. This closed-loop control maintains manufacturing precision while keeping the system easy to operate, as the feedback automatically compensates for variations without requiring complex manual adjustments

Inventive Principle:

Principle #23Feedback

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 solution allows for the scaling up of nanometer-resolution contact printing technologies, enabling the production of complex high-resolution patterns in industrial roll-to-roll systems, surpassing the limitations of traditional methods by providing precise control over the print roller's motion and contact pressure.

Implementation Method 1

two monolithic flexures configured to support the opposite ends of the print roller, respectively

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

bonding the first layer of PDMS with a second layer of PDMS of the print roller so as to bond an elastomeric stamp onto the print roller

Methodology Applied

Scientific EffectElastic bonding: Adhesive

Data Source

PatentUS9931664B2Roll-to-roll printing systems and methods for fabricating print roller

Publication Date: 2018.04.03 THE CHINESE UNIVERSITY OF HONG KONG

AI summary

A multiple degrees of freedom control apparatus for a roll-to-roll printing system.