Triangular Profile Crease Lines for Packaging Folding
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Solution Overview
Problem
Conventional creasing technologies for packaging materials result in unpredictable and inexact folding due to multiple shear fracture initiations, leading to reduced mechanical strength and stability of the final packages, especially when used for liquid food packaging where precise geometry and safety are critical.
Innovation Solution
A continuous web of packaging material with crease lines formed as elongated grooves having a triangular profile on one side and an embossment on the other, creating a single fracture initiation line to facilitate a continuous hinge mechanism with a single axis of rotation, reducing material thickness by 5-25% and ensuring precise folding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional creasing technology with rigid bars and recesses is used to facilitate folding, then the packaging material can be folded, but the material is exposed to considerable stresses causing disintegration and weakening
Solution Approach 1:
The invention changes the geometric parameters of the crease line from a conventional rectangular profile to a triangular profile with specific angle ranges (30-60 degrees for the first angle, 30-60 degrees for the second angle). This parameter change allows the crease to facilitate folding while distributing stress more evenly, preventing material disintegration and maintaining mechanical strength.
2Ease of operation
If multiple shear fracture initiations are created by conventional crease bars, then folding is facilitated, but the folding becomes unpredictable and inexact
Solution Approach 1:
The invention introduces asymmetry in the crease line design by using a triangular profile with specific angle ranges rather than a symmetric rectangular profile. This asymmetric design creates a single dominant shear fracture initiation zone, ensuring predictable and precise folding along the intended crease line, eliminating the unpredictable switching between multiple fracture zones.
3Shape
If the packaging material is compressed between rigid bars to create crease lines, then folding lines are formed, but the folded edges become rounded and broad rather than sharp
Solution Approach 1:
The invention changes the geometric parameters of the crease line profile from rectangular to triangular with specific angle ranges. The acute angles of the triangular profile concentrate the compressive force into a smaller area, creating a sharper crease line and preventing the rounded, broad edges that result from conventional rectangular crease bars.
4Ease of operation
If conventional crease lines with two zones of increased stress are used, then folding can occur, but the package experiences reduced grip stiffness and stability
Solution Approach 1:
The asymmetric triangular profile creates an uneven stress distribution with one primary shear fracture initiation zone rather than two symmetric zones. This asymmetric design ensures that folding occurs predictably along a single line, maintaining the structural integrity and dimensional stability of the package while still facilitating easy folding.
Data Source
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AI summary
A bulk-based packaging material is provided, comprising at least one crease line (9) for facilitating folding of the packaging material to a package. The at least one crease line (9) is formed as an imprint on a primary side of said packaging material, and as an embossment on a secondary side of said packaging material, wherein said imprint is formed as an elongated groove having a triangular profile.