Sheet Packaging Material Slanted Crease Pattern Corner Stress
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Solution Overview
Problem
Existing sheet packaging materials for pourable food products weaken during folding, particularly at the corners, leading to non-optimal package formation and stability issues.
Innovation Solution
The sheet packaging material incorporates a modified crease pattern with strategically aligned and offset longitudinal crease lines and slanted crease lines, which reduce local stress and prevent material weakening during folding, enhancing the forming process and stability of the package.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional crease lines are used in sheet packaging material, then the package can be formed through folding, but the material weakens during folding especially at corners leading to non-optimal package formation
Solution Approach 1:
The patent applies local quality by creating different crease line configurations in different regions of the packaging material. Specifically, the first longitudinal crease lines are positioned at different locations than the second longitudinal crease lines, and slanted crease lines are added at specific angles. This local variation in crease pattern optimizes the folding process in different areas, preventing material weakening at corners while maintaining proper package formation.
2Ease of operation
If crease lines are formed to enable folding of the packaging material, then the package can be formed into desired configuration, but the crease lines become stress concentration points causing material weakening
Solution Approach 1:
The patent segments the continuous longitudinal crease lines into separate first and second longitudinal crease lines positioned at different locations. Additionally, slanted crease lines are introduced to divide the stress paths. This segmentation prevents stress concentration along single continuous lines, allowing folding to proceed while maintaining material reliability and preventing weakening at critical points.
3Device complexity
If the packaging material is folded along simple longitudinal lines, then the forming process is simple, but the package corners and edges are not optimally formed
Solution Approach 1:
The patent introduces asymmetry by positioning the first longitudinal crease lines at different locations than the second longitudinal crease lines, and by adding slanted crease lines at specific angles rather than following simple symmetric patterns. This asymmetric crease configuration optimizes the formation of package corners and edges, creating better geometric precision in the final package structure.
Data Source
AI summary
A sheet packaging material for producing a sealed package comprises two first boundary edges parallel to a longitudinal direction and two second boundary edges parallel to a transversal direction orthogonal to the longitudinal direction. The sheet packaging material includes at least a bottom transversal crease line including a bottom central portion, a bottom end portion and a bottom side portion. The sheet packaging material includes a pair of slanted crease lines inclined relative to both the longitudinal and transverse directions. The slanted crease lines have first ends pointing to one of the second boundary edges and second ends pointing to a continuous line parallel to the transversal direction and including the bottom central portion and the bottom end portion. The slanted crease lines delimit, with the bottom side portion, a flap area of the sheet packaging material designed to form at least part of a lateral flap of the package.