Rounded Edge Container Forming via Debossed Grooves
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Solution Overview
Problem
Existing container boxes with curved or rounded edges, such as cigarette boxes, can have rough surfaces and limited space for branding or logos, and may cause wear on accessories due to sharper edges compared to soft packages.
Innovation Solution
A method and apparatus for forming a container with a rounded edge by debossing a plurality of linear grooves into a stiff paper or card blank, which are then bent to create a smooth, curved edge with a debossed inner surface and a smooth outer surface, using a debossing tool with linear tool elements and a flat counter surface to avoid surface damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional methods are used to create curved or rounded edges on rigid containers, then the edges become softer and less sharp, but the outer surface becomes rough and corrugated
Solution Approach 1:
The blank is divided into multiple grooves (typically 3-20 grooves) along the region intended to form the rounded edge. These grooves extend substantially parallel to an axis defining a center of curvature. When the grooved region is bent about the axis, the bending deflection is distributed over the plurality of grooves, creating a substantially rounded edge with a smooth outer surface while maintaining adequate edge softness.
Solution Approach 2:
The grooves are formed only in a specific region of the blank intended to form the rounded edge, while the rest of the blank maintains its original smooth surface quality. This localized modification allows the rounded edge region to have different surface characteristics (smooth outer surface with distributed grooves) compared to the rest of the container.
2Ease of manufacture
If conventional debossing methods are used without a flat counter surface, then grooves can be formed in the blank, but the opposite side of the blank becomes damaged or scratched
Solution Approach 1:
A flat or smooth counter surface is introduced as an intermediary element during the debossing process. The at least one tool element is pressed into the first surface of the blank while the opposite side is supported on the flat counter surface. This counter surface prevents direct contact between the tool element and the opposite side of the blank, thereby avoiding surface damage while enabling groove formation.
3Manufacturing precision
If more grooves are added to create a smoother rounded edge, then the surface smoothness improves, but the manufacturing complexity increases
Solution Approach 1:
The debossing tool is configured with multiple substantially linear tool elements (typically 3-20 elements) that can be simultaneously or consecutively pressed into the blank to form multiple grooves. This segmented approach to groove formation allows for controlled increase in groove number to achieve desired surface smoothness while maintaining manageable tool complexity through modular tool element design.
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 solution results in a container with a smoother feel and more surface area for branding or logos, while minimizing wear on accessories by reducing edge sharpness.
Implementation Method 1
forming a plurality of substantially linear grooves in a region of the blank intended to form the rounded edge... The step of forming the grooves in said region of the blank comprises debossing a first surface or side of the blank... pressing at least one substantially linear tool element into the first surface or face of the blank
Implementation Method 2
bending the grooved region of the blank about said axis such that a substantially rounded edge is obtained by virtue of bending deflection that is distributed over the plurality of grooves
Data Source
Figure 1~4
AI summary
The invention provides a blank (1) for forming a container having a curved or rounded edge, and comprises: a plurality of substantially linear grooves (5) formed in a region (2) of the blank (1) intended to form the rounded edge, the grooves (5) extending substantially parallel to one another and being debossed into a first surface or face (6) of the blank (1) that forms an inner surface of the rounded edge. Furthermore, an opposite or reverse surface or face (7) of the blank (1) in this region (2) is substantially smooth. The invention also provides a method and apparatus for forming a curved or rounded edge in a container made from a flat blank.