Beverage Can Bottom Protection Layer Inkjet Printing
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Solution Overview
Problem
Beverage cans lack effective protection and chemical conversion treatment on their outer circumferential surfaces, particularly at the bottom part, due to difficulties in ink adhesion and uneven treatment distribution.
Innovation Solution
A method for forming a beverage can with a protection layer on the outer circumferential surface of the bottom part using an inkjet head, where the ink ejection conditions and amount per droplet can differ from those for the cylindrical part, ensuring continuous design patterns and improved chemical conversion treatment efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protection layer is formed only on the cylindrical part by conventional printing methods, then the outer circumferential surface of the cylindrical part is protected, but the bottom part remains exposed and unprotected
Solution Approach 1:
The inkjet head is configured to perform dual functions: forming images on the cylindrical part and forming protection layers on the bottom part. This multi-functional approach ensures complete coverage without requiring separate manufacturing processes, resolving the contradiction between comprehensive protection and manufacturing simplicity
Solution Approach 2:
Different regions of the can (cylindrical part vs. bottom part) receive different treatments through the same inkjet head. The cylindrical part receives image printing while the bottom part receives protection layer formation, with local optimization of ink ejection parameters for each region to achieve both aesthetic and protective functions
2Reliability
If chemical conversion treatment liquid is applied to the bottom part, then chemical conversion treatment is performed, but the liquid is difficult to stay on the outer circumferential surface resulting in small treatment effect
Solution Approach 1:
The protection layer is formed on the bottom part before chemical conversion treatment. This preliminary action creates a surface that can retain the chemical conversion treatment liquid, ensuring effective treatment while the protection layer prevents subsequent damage
Solution Approach 2:
The protection layer acts as a composite structure that combines image-forming ink with protective properties. This composite layer on the bottom part provides both aesthetic continuity and enhanced retention of chemical conversion treatment liquid, improving treatment efficacy
3Productivity
If the same ink ejection conditions are used for both the cylindrical part and bottom part, then the process is simplified, but the bottom part requires different ink amounts and conditions for optimal protection layer formation
Solution Approach 1:
The inkjet head dynamically adjusts its operation mode based on the target surface. When processing the bottom part, it switches to protection layer formation mode with optimized ink ejection conditions, while maintaining image formation mode for the cylindrical part. This dynamic adaptation ensures optimal results for each surface while maintaining continuous processing efficiency
4Ease of manufacture
If the bottom part is left without a protection layer, then the manufacturing process is simpler, but the bottom part lacks protection and chemical conversion treatment effectiveness
Solution Approach 1:
The inkjet head performs dual functions of image formation and protection layer formation in a single integrated process. By utilizing the same equipment for both purposes, the system maintains manufacturing simplicity while ensuring the bottom part receives adequate protection, resolving the contradiction between process simplicity and protection reliability
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 method provides enhanced protection and improved chemical conversion treatment on the outer circumferential surface of the bottom part, ensuring a stronger protective layer and better image continuity with the cylindrical part, enhancing the overall appearance and durability of the can.
Implementation Method 1
a protection layer forming process applying ink to the outer circumferential surface of the bottom part to form a protection layer on the outer circumferential surface
Implementation Method 2
ink may be ejected from an inkjet head to an outer circumferential surface of the cylindrical part to form an image on the outer circumferential surface, and ink may be ejected from an inkjet head to the outer circumferential surface of the bottom part to form the protection layer
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
A method for manufacturing a beverage use can, which is provided with a cylindrical part with one end portion and the other end portion, a bottom part positioned at the one end portion of the cylindrical part, the bottom part having an outer circumferential surface with an outer diameter gradually increasing with a move toward the other end portion of the cylindrical part, includes a protection layer forming process applying ink to the outer circumferential surface of the bottom part to form a protection layer on the outer circumferential surface.