Polygonal Can Forming via Isometric Peripheral Length
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Solution Overview
Problem
Conventional methods for forming a bottomed cylindrical can into a polygonal can result in deformation and poor decoration quality due to diameter-constriction and expansion processing, making it difficult to achieve high-quality decoration and efficient production.
Innovation Solution
A method involving the formation of a polygonal can from a cylindrical base-can with isometric changes to the bottom-part periphery and body-part cross-sectional surface, using linear-part and corner-part forming means to maintain the same peripheral length and prevent deformation, allowing for seamless decoration and efficient production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional diameter-constriction and expansion processing is used to form a polygonal can from a cylindrical base-can, then the can shape is changed from cylindrical to polygonal, but deformation and folding are caused in the body-part wall surface and decorated surface
Solution Approach 1:
The invention changes the fundamental approach from diameter-constriction/expansion processing to isometric transformation. The body-part cross-section peripheral length is maintained substantially constant during the transformation from cylindrical to polygonal shape, fundamentally changing the processing parameters to avoid deformation. This is achieved through specific forming means that reshape the bottom-part periphery while maintaining the body-part cross-sectional perimeter.
Solution Approach 2:
The invention performs preliminary shaping of the bottom-part periphery before final polygonal formation. By preparing the bottom-part with appropriate pre-forming operations, the subsequent transformation to polygonal shape proceeds without causing deformation to the body-part wall surface or decorated surface.
2Shape
If conventional forming methods are used to change the bottom part shape from cylindrical to square, then the polygonal can shape is achieved, but high-quality decoration cannot be obtained due to deformation and folding
Solution Approach 1:
The invention maintains the body-part cross-section peripheral length substantially constant during the transformation, which prevents deformation of the decorated surface. This parameter control ensures that printing, painting, or other decorations applied to the cylindrical base-can remain undistorted in the final polygonal can, achieving high-quality decoration without requiring complex correction processes.
3Productivity
If curved-surface printing is applied to cylindrical cans, then high-quality decoration is achieved in a single step, but this method cannot be directly applied to polygonal cans requiring separate printing of four surfaces
Solution Approach 1:
The invention applies curved-surface printing to the cylindrical base-can before the polygonal transformation. Since the body-part cross-sectional perimeter is maintained substantially constant during transformation, the decoration applied in advance remains undistorted and high-quality in the final polygonal can. This eliminates the need for separate printing operations on each polygonal face and complex position alignment procedures.
4Productivity
If polygonal cans are formed from cylindrical cans with decoration, then the cans can be produced, but position alignment becomes difficult and dedicated decoration lines are required
Solution Approach 1:
By maintaining the body-part cross-section peripheral length substantially constant during the transformation from cylindrical to polygonal shape, the invention ensures that decorations applied to the cylindrical base-can remain in their original positions and orientations. This eliminates the need for dedicated polygonal can decoration lines and complex position alignment procedures, allowing cylindrical can decoration equipment to be used for producing decorated polygonal cans.
Data Source
AI summary
Provided is a polygonal in which a decoration effect equivalent to that of a cylindrical base-can is obtained without causing folding or deformation in a can body-part. Bottom-part outer-peripheral parts (A-2) of a cylindrical base-can that are expected to form linear parts (B-2) of a polygonal can (B) are moved inward in a radial direction, while bottom-part outer-peripheral parts (A-1) of the cylindrical base-can that are expected to form corner parts (B-1) of the polygonal can are moved outward in the radial direction. Thus, the polygonal can is molded such that the body-part cross-section peripheral length of the cylindrical base-can and the body-part cross-section peripheral length of the molded polygonal can have a substantially isometric relationship.