Flexible Package Tearing Opening Strip Design
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Solution Overview
Problem
Existing packaging solutions with tearing openings often experience deviations from straight tearing due to misalignment of tear-promoting notches and laser cuts, leading to increased costs and risks of damaging the package, especially when using laser systems.
Innovation Solution
A package design featuring a tear-promoting notch aligned with a pre-cut line on a heat-sealable strip, ensuring that the tear proceeds straight along the separation line between the strip's slices, preventing deviation and maintaining the package's integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If laser cuts are used to create the tearing opening, then the cutting precision is improved, but the manufacturing cost increases and the risk of package damage increases
Solution Approach 1:
The patent replaces expensive laser cutting systems with a simple, inexpensive pre-cut strip that is heat-sealed to the package interior. The strip is a disposable component that guides the tear without requiring costly equipment, thereby reducing manufacturing costs while maintaining adequate cutting precision.
Solution Approach 2:
The pre-cut strip acts as an intermediary element between the tear-promoting notch and the package material. It provides a controlled separation line that guides the tear path without requiring direct laser cutting of the package itself, thus mediating the tearing process to avoid both cost and damage risks.
2Manufacturing precision
If laser cuts are used to create the tearing opening, then the cutting precision is improved, but the package may be damaged due to excessive laser power
Solution Approach 1:
The pre-cut strip serves as a protective intermediary that absorbs the tearing action. Instead of applying laser energy directly to the package which risks damaging intermediate barrier layers, the tear is channeled through the strip's pre-defined separation line, eliminating the harmful thermal effects on the package structure.
Solution Approach 2:
The strip is pre-cut during manufacturing with a separation line that is prepared in advance. This preliminary action creates a controlled weakness that guides the tear without requiring high-energy laser cutting during operation, thus preventing package damage while achieving precise tearing.
3Device complexity
If a single laser cut is used, then the manufacturing process is simple, but the tear may deviate from the straight cut due to notch misalignment
Solution Approach 1:
The strip is pre-cut during manufacturing with a separation line that is prepared in advance and heat-sealed to the package. This preliminary action creates a fixed, stable guide for the tear path that is not subject to alignment issues during the tearing operation, ensuring straight tears without requiring complex real-time adjustments.
Solution Approach 2:
The invention changes the approach from direct laser cutting of the package to using a heat-sealed strip with a pre-defined separation line. This parameter change in the manufacturing method allows for better control of the tear path through the strip's physical structure rather than relying on precise laser positioning and notch alignment.
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 ensures perfectly straight tearing during opening, reducing manufacturing costs and eliminating the risk of package damage, while maintaining a simple and cost-effective production process.
Implementation Method 1
a strip 3 pre-cut longitudinally into two halves or slices 4, 5 along a cutting line 6 which runs parallel to the upper edge 2 of the die-cut blank 1 or of the package 10, is disposed on the inside of the die-cut blank
Data Source
Figure 1~3
Figure 4~6
AI summary
There is disclosed a package for granular, pasty or liquid products, provided with a tearing opening, wherein at said tearing opening, on the inside of the package, there is applied a strip (3) pre-cut in two slices (4, 5) by a separation line (6) which extends parallel to the upper edge (2) of the package, so that during tearing the tear proceeds straight along said separation line (6).