Roll Blade Coating Uniformity via Segmented Air Cylinder Pressure Control
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Solution Overview
Problem
Conventional roll blade coating methods experience variations in adhesion amount of coating liquid along the width direction due to uneven contact pressure, leading to decreased adhesion at the ends of the web, resulting in non-uniform film thickness.
Innovation Solution
A roll blade coating method utilizing air cylinders to adjust the air pressure separately at the ends and central parts of the web, ensuring uniform adhesion by fine-tuning the pressing force with a holding member and air pressure regulators, while maintaining a specific diameter and arrangement pitch for the air cylinders and roll blade.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single tubular air containing member is used to press the roll blade, then the structure is simple, but the contact pressure becomes uneven in the width direction causing non-uniform adhesion amount
Solution Approach 1:
The single tubular air containing member is divided into multiple separate air containing members arranged along the width direction of the roll blade. Each air containing member can be independently adjusted to compensate for thickness variations in the web, thereby achieving uniform contact pressure and adhesion amount across the width direction while maintaining relatively simple structure.
Solution Approach 2:
Different air containing members are positioned at different locations along the width direction of the roll blade to provide locally optimized pressing force. This allows the system to address local variations in web thickness and achieve uniform adhesion amount across different regions of the coating surface.
2Stress or pressure
If the web thickness varies in the width direction, then the contact pressure becomes higher at both ends, but this causes decreased adhesion amount at the ends and non-uniform film thickness
Solution Approach 1:
The air containing members are independently adjustable to provide different pressing forces at different locations. This allows compensation for the increased contact pressure at the ends of the web, ensuring uniform adhesion amount across the width direction despite variations in web thickness.
Solution Approach 2:
The air pressure in each air containing member can be independently adjusted to change the pressing force locally. By reducing the air pressure at the end positions compared to the central position, the system compensates for the excessive contact pressure caused by web thickness variations, achieving uniform adhesion amount.
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 approach effectively minimizes deviations in adhesion amount along the width direction, achieving uniform coating liquid application and film thickness across the web.
Implementation Method 1
the air cylinders can separately be adjusted in air pressure
Data Source
AI summary
A roll blade coating method including transferring an excessive amount of a coating liquid onto a continuously running web, and adjusting the excessive amount of the coating liquid to a desired adhesion amount with a roll blade, wherein the roll blade is held by a holding member for holding the roll blade, wherein the holding member is pressed by a plurality of air cylinders each configured to press the holding member, wherein the air cylinders are arranged in a side of the holding member, which side is opposite to a side where the holding member holds the roll blade, and wherein the air cylinders can separately be adjusted in air pressure.