Aerosol Container Ink Curing with LED Light
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Solution Overview
Problem
The conventional dry offset printing process for aerosol containers lacks effective ink curing, leading to unsightly discolorations, limited varnish options, yellowing over time, and poor scratch resistance, primarily due to the absence of light-based curing, which restricts the use of solvent-based varnishes and results in imperfections like lap lines.
Innovation Solution
Incorporating an LED light source in the manufacturing process to cure inks before varnishing, allowing for the use of solvent-based varnishes and reducing temperature and fume issues associated with UV light sources, thereby improving the curing process and container finish.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UV light source is used to cure ink, then ink curing is achieved, but high temperatures and fumes are produced that impair the curing process and require exhaust systems
Solution Approach 1:
The patent changes the wavelength parameter of the light source from UV range to LED range (405nm or 395nm), which fundamentally alters the energy output characteristics. This parameter change enables effective ink curing while producing significantly lower temperatures and fewer fumes compared to traditional UV sources, directly resolving the technical contradiction between achieving reliable curing and avoiding harmful thermal and atmospheric effects
Solution Approach 2:
The patent substitutes the traditional UV lighting system with an LED-based optical system. This replacement eliminates the need for complex exhaust and temperature control systems that are required with UV sources, while maintaining effective ink curing capability. The LED system provides a cleaner, more controlled curing environment without the harmful byproducts associated with UV illumination
2Device complexity
If no light source is used for ink curing, then the process is simple, but unsightly discolorations, lap lines, and poor scratch resistance occur
Solution Approach 1:
The patent applies preliminary action by curing the ink with LED light before the varnishing step. This pre-curing of the ink layer prevents subsequent discolorations, lap lines, and adhesion problems that would occur without proper ink curing. By performing this critical preparation step in advance, the patent ensures high surface quality and scratch resistance while maintaining a relatively simple overall process structure
Solution Approach 2:
The introduction of LED light sources with specific wavelengths (405nm or 395nm) changes the curing parameter from none to controlled optical energy input. This parameter change enables effective ink curing that prevents surface defects and improves scratch resistance, while the LED technology keeps the added complexity minimal compared to traditional UV systems
3Ease of manufacture
If water based varnish is used, then the process is compatible with conventional printing, but scratch resistance and gloss appearance are limited
Solution Approach 1:
The patent applies preliminary action by thoroughly curing the ink layer with LED light before applying the varnish. This pre-curing creates a stable, cross-linked ink surface that is compatible with solvent-based varnishes. The proper ink curing prevents ink-varnish incompatibility issues, allowing the use of higher-performance solvent-based varnishes that provide superior scratch resistance and gloss appearance while maintaining ease of manufacture
Solution Approach 2:
The patent creates a composite structure with properly cured ink as the base layer and solvent-based varnish as the protective top layer. The LED curing of the ink layer enables this composite structure to function effectively, as the cured ink provides a stable substrate that bonds well with solvent-based varnishes, resulting in a finished product with enhanced scratch resistance and aesthetic properties
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
The use of an LED light source enables better scratch resistance, a glossier appearance, reduced yellowing, and the ability to run matte varnishes, increasing the variety of container finishes and offering a wider selection for manufacturers while maintaining lower production line temperatures.
Implementation Method 1
an LED light source, which produces much lower temperatures than a Uv source effects the desired curing
Data Source
AI summary
A production line is for aerosol containers (AC) whose exterior surface is printed with inks in a predetermined pattern to form a desired design including both imagery and graphics. The line includes an inking station and a varnish application station through which aerosol containers successively pass. Inks are applied to containers at the inking station and a varnish to the inked exterior of the container at the varnish station. A LED light module (12) installed between the ink station and varnish station emits a light within a predetermined frequency range onto inked containers. The temperature produced by the LED light source is cooler than that of Uv light sources that could be used for the same purpose. The exterior surface of finished containers exhibit no lapping or discolorations and have improved scratch resistance.