Packaging Sleeve Weakening Lines for Clean Container Separation
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Solution Overview
Problem
Existing packaging containers face issues with unreliable and difficult sleeve removal due to tearing during separation, especially in automated processes, and require improved cutting methods to ensure clean and efficient detachment.
Innovation Solution
A packaging container design featuring a first weakening line parallel to the end section and a second weakening line, preferably forming a circular arc or two straight lines at angles, allows for reliable separation by applying radial tensile or compressive forces, with optional recesses to facilitate cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single weakening line is used for sleeve separation, then the structure is simple, but reliable cutting cannot be achieved in all applications and tearing occurs during separation
Solution Approach 1:
The single weakening line is divided into two separate weakening lines (first and second weakening lines) positioned at different locations on the cuff. This segmentation allows the cutting force to be distributed across multiple locations, preventing concentration of stress at a single point and eliminating the tearing problem while maintaining overall structural simplicity
2Ease of operation
If a weakening line is positioned to enable easy cutting, then separation is simple, but the required radial outward pulling force is problematic for automated separation processes
Solution Approach 1:
The solution transitions from requiring radial outward pulling force to applying axial compressive or tensile forces along the longitudinal axis of the container. This dimensional change in force application makes the separation process compatible with automated handling systems while maintaining ease of operation
3Ease of manufacture
If the cuff is made from overlapping end sections, then the cuff can be formed from a planar blank, but separation may cause tearing at the overlap area
Solution Approach 1:
The first weakening line is positioned specifically adjacent to the overlap area while the second weakening line is positioned at a distance from it. This local differentiation ensures that the overlap area is properly addressed during separation without compromising the overall structural integrity, enabling clean separation without tearing at the overlap region
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a packaging container encased in a sleeve (2) formed from a planar blank (20) whose end sections (3, 4) are joined together in an overlap area (21), wherein at least one first weakening line (6) is arranged in the blank (20), which runs parallel to an end section (3, 4) and via which the sleeve can be separated without tools. A second weakening line (7) is arranged spaced apart from the first weakening line (6), which is essentially in the form of a circular arc or two straight lines set at an angle to each other.