Can Blank Dot Grid Adaptation for Deformation
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Solution Overview
Problem
Existing can blanks with printed images face issues in maintaining uniform layer thickness and resolution across different deformation areas, particularly during the drawing-in process for aerosol can applications, where compression and expansion lead to variations in screen ruling and layer thickness.
Innovation Solution
The solution involves adapting the second screen ruling to be within the screen interval of the first ruling after plastic deformation, ensuring that the screen widths of different print areas align uniformly, and applying a protective coating to maintain image integrity during deformation. This is achieved by selecting screen widths proportional to the deformation changes and using a solvent-based polar coating for durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a uniform screen ruling is applied across all printing areas, then the printing process is simple and fast, but the layer thickness becomes non-uniform after plastic deformation
Solution Approach 1:
The patent applies different screen rulings to different printing areas based on their specific deformation characteristics. The can blank is divided into multiple printing areas, each with a locally optimized screen ruling that accounts for the expected plastic deformation in that region. This ensures that after deformation, all areas achieve uniform layer thickness while maintaining efficient printing processes.
2Manufacturing precision
If the screen ruling is adapted to deformation for each printing area, then uniform layer thickness is achieved after deformation, but the printing process becomes more complex
Solution Approach 1:
The patent implements preliminary planning of different screen rulings for different printing areas before the actual printing process. The deformation characteristics of each area are analyzed in advance, and appropriate screen rulings are predetermined. This allows the printing device to be configured efficiently with area-specific parameters, achieving uniform layer thickness after deformation without requiring complex real-time adjustments during printing.
3Ease of manufacture
If a single screen ruling is used for all areas, then the printing setup is simple, but the graphic representation quality varies after deformation
Solution Approach 1:
The patent divides the can blank into multiple printing areas, each assigned a specific screen ruling tailored to its deformation characteristics. This local optimization ensures that after plastic deformation, all areas maintain consistent image resolution and graphic representation quality. The approach balances manufacturing simplicity with high-quality output by pre-planning area-specific parameters.
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 approach ensures a uniform resolution and layer thickness for the printed image across all areas, enhancing the graphic representation and preventing undesired layer thickness changes during deformation, thus improving the visual appearance and mechanical resilience of the can blank.
Implementation Method 1
an outer surface (2) of which is provided with a carrier coating onto which a printed image is applied
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a can blank with a hollow body, which is provided on an outer surface (2) with a carrier coating onto which a printed image is applied, which is formed from a plurality of individual dots (21; 41) which are spaced apart from each other in a predefinable grid spacing (24, 25, 26; 42, 43, 44, 45), wherein a first printing area (5) has a first grid spacing (24, 25, 26; 42, 43, 44, 45) and a second printing area (6, 7, 8) has a second grid spacing (24, 25, 26; 42, 43, 44, 45) which is different from the first grid spacing. According to the invention, the second grid spacing lies outside a grid interval arranged around the grid spacing of the first printing area (5) and the second grid spacing is adapted to a subsequent plastic deformation of the hollow body such that the second grid spacing lies within the grid interval after the plastic deformation of the second printing area (6, 7, 8).