Metal Container Printing With Local Activation for Ink Adhesion
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Solution Overview
Problem
Existing printing processes struggle to adhere printing inks to the outer surface of metal containers with low surface energy, especially those that have undergone previous processing operations, leading to poor ink adhesion and quality issues.
Innovation Solution
A printing process that involves heating the metal container to a pre-treatment temperature between 100°C and 250°C, followed by cooling, local activation of the printing zone to increase surface energy, and local heating to a temperature between 30°C and 70°C for improved ink adhesion, using methods like corona treatment, plasma treatment, or gas flame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the metal container is printed directly without pre-treatment, then the printing process is simple and fast, but the ink adhesion is poor due to low surface energy
Solution Approach 1:
The patent applies preliminary heating (100-250°C) and cooling to the metal container before printing to modify the surface properties. This pre-treatment prepares the surface by adjusting temperature and surface energy, ensuring better ink adhesion before the actual printing process occurs.
Solution Approach 2:
The patent changes physical parameters of the metal container surface, specifically temperature (heating to 100-250°C then cooling) and surface energy (through activation processes), to transform the low surface energy state into a high surface energy state that accepts ink adhesion properly.
2Reliability
If the metal container is heated to high pre-treatment temperature, then the surface energy increases and ink adhesion improves, but thermal stress damages existing coatings
Solution Approach 1:
The patent applies local activation specifically to the printing zone rather than treating the entire container uniformly. This localized approach increases surface energy where needed for ink adhesion while minimizing thermal stress exposure to other areas with existing coatings that could be damaged by high temperature.
Solution Approach 2:
The patent performs preliminary heating to 100-250°C followed by cooling before the actual printing and local activation steps. This preliminary thermal treatment prepares the surface for activation while the subsequent cooling reduces temperature to safe levels before printing, preventing thermal damage to coatings during the printing process.
3Object-affected harmful factors
If the metal container is cooled to below 100°C before printing, then thermal stress on coatings is reduced, but the printing process requires additional time
Solution Approach 1:
The patent performs preliminary heating followed by cooling to below 100°C before printing. This preliminary thermal conditioning prepares the surface for activation and printing while reducing temperature to protect existing coatings, accepting the time investment as necessary for quality results.
Solution Approach 2:
The patent changes the temperature parameter from high (100-250°C pre-treatment) to low (below 100°C before printing) to create optimal conditions for surface activation and ink application, balancing the need for surface preparation with protection of existing coatings.
4Reliability
If local activation is applied to increase surface energy, then ink adhesion improves, but the process complexity increases
Solution Approach 1:
The patent applies activation processes (corona, plasma, or flame) specifically to the printing zone rather than the entire container. This localized activation concentrates the surface energy enhancement where it is needed for ink adhesion while minimizing the complexity and energy requirements of the activation process.
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
Enhances ink adhesion and quality by increasing the surface energy of the metal container's outer surface, ensuring uniform ink distribution and maintaining the integrity of the printed image.
Implementation Method 1
Heating of the metal container, in particular in the form of a metal bottle ready for filling, to a pre-treatment temperature which lies in an interval between 100 degrees Celsius and 250 degrees Celsius
Implementation Method 2
cooling of the metal container to a temperature below 100 degrees Celsius
Implementation Method 3
locally heating the printing zone to a printing temperature which is in an interval between 30 degrees Celsius and 70 degrees Celsius
Implementation Method 4
local activation of a printing zone, formed on an outer surface of the metal container to increase a surface energy of the printing zone
Data Source
AI summary
A printing process for a metal container includes the steps: Heating the metal container, in particular formed as a metal bottle ready for filling, to a pre-treatment temperature lying in an interval between 100 degrees Celsius and 250 degrees Celsius, cooling the metal container to a temperature below 100 degrees Celsius, locally activating a printing zone, formed on an outer surface of the metal container to increase a surface energy of the printing zone and/or locally heating the printing zone to a printing temperature which is in an interval between 30 degrees Celsius and 70 degrees Celsius, printing the printing zone with a printing method.