UV Curing Roller with Permeable Coating for Uniform Varnish Cure
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Solution Overview
Problem
Existing UV varnish curing methods face challenges with oxygen inhibition and equipment complexity, particularly when using LED emitters, leading to non-uniform curing and edge defects on substrates with complex geometries.
Innovation Solution
A roller-based method and apparatus with distributed UV LED emitters on the roller core, surrounded by a permeable coating, ensures uniform curing by penetrating the roller coating to reach the substrate surface, minimizing oxygen inhibition and edge defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If UV LED emitters are used for curing, then energy consumption is reduced, but oxygen inhibition becomes problematic leading to non-uniform curing
Solution Approach 1:
A permeable coating is introduced as an intermediary layer between the UV LED emitter and the varnish. This coating allows UV radiation to pass through while maintaining close proximity to the substrate, enabling effective curing even in the presence of oxygen. The coating acts as a mediator that facilitates UV transmission without requiring direct contact between the LED and varnish.
Solution Approach 2:
The invention replaces conventional mercury vapor lamp technology with UV LED emitters. This substitution eliminates the need for complex mechanical ballast systems and high-voltage power supplies, reducing energy consumption while enabling operation at longer wavelengths that penetrate through the permeable coating to achieve uniform curing.
2Reliability
If distributed UV sources are arranged on roller core, then manufacturing complexity increases, but curing uniformity is improved
Solution Approach 1:
The UV lighting system is segmented into multiple discrete LED emitters distributed around the roller core circumference. This segmentation allows each LED to illuminate a specific sector of the substrate, ensuring uniform curing across the entire surface while enabling modular assembly and maintenance of the roller system.
Solution Approach 2:
The UV sources are arranged in a circular pattern around the roller core, creating a radially symmetric distribution of UV radiation. This curved arrangement ensures that all areas of the substrate receive equivalent UV exposure as the roller rotates, achieving uniform curing without requiring complex control systems.
3Illumination intensity
If roller coating is made permeable to UV radiation, then UV transmission is improved, but coating material selection becomes more restrictive
Solution Approach 1:
The roller coating is designed with porous or permeable structure that allows UV radiation to pass through while maintaining mechanical integrity and providing necessary surface properties for varnish application. The porous structure enables UV transmission without requiring the coating to be completely transparent, expanding material options.
Solution Approach 2:
The invention changes the optical parameters of the roller coating by selecting materials with specific UV transmission characteristics. By adjusting the coating thickness, porosity, and material composition, the system achieves optimal UV transmission while maintaining other required coating properties, thus broadening material selection flexibility.
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
Achieves high-quality, uniform curing with reduced energy consumption and minimal edge defects, enabling efficient UV varnish application on substrates with complex geometries.
Implementation Method 1
at least one UV source (10), in particular at least one UV LED emitter (11), is arranged on the roller core (8)
Implementation Method 2
the UV light splits the photoinitiators of the UV varnishes into radicals, which in turn polymerize the double bonds in a chain reaction
Implementation Method 3
the UV radiation penetrates a roller coating (9) surrounding the periphery and strikes the surface coated with the UV varnish (3)
Data Source
AI summary
The invention relates to a method for curing UV varnish (3), which is applied to the surface of a substrate (2), using a roller (7), the roller core (8) of which holds at least one UV radiating-emitting UV source (10), in which method the UV radiation penetrates a roller coating (9) surrounding the periphery and strikes the surface coated with the UV varnish (3).