Pouch Laser Scoring With Converging Weakened Lines
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Solution Overview
Problem
Existing pouches with laser-scored lines of weakness often experience uncontrolled tear propagation, leading to difficulties in opening, especially when the pouch or hands are wet, and alignment issues during manufacturing can further complicate easy tearing.
Innovation Solution
A pouch design featuring a plurality of at least partly non-linear weakened lines, where at least two lines converge to form a single weakened line, allowing for controlled and guided tear propagation, and using methods like laser scoring or embossing to create these lines for improved tear initiation and propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If laser-scored lines of weakness are used to enable easy tearing, then tear initiation is improved, but tear propagation becomes uncontrolled and may propagate into the body of the pouch
Solution Approach 1:
The invention divides the tear propagation path into multiple segmented weakened lines instead of a single continuous line. These segmented lines are arranged in a pattern that guides the tear to propagate in a controlled manner toward a predetermined direction, preventing uncontrolled propagation into the pouch body while maintaining easy tear initiation.
Solution Approach 2:
The invention introduces an intermediary element - a predetermined direction indicator or guide - that mediates between the tear initiation point and the final tear path. This intermediary guides the tear propagation force along a safe, controlled trajectory, acting as a mediator that prevents direct propagation into the pouch body while maintaining ease of opening.
2Ease of operation
If linear tear-lines are used for easy tearing, then tear propagation is simplified, but alignment precision during manufacturing becomes difficult to maintain
Solution Approach 1:
The invention applies local quality variations in the weakened line pattern - different regions of the pouch have differently oriented or positioned weakened lines. This local variation accommodates manufacturing tolerances and film shifts, as each local area can be optimized independently for tear propagation while maintaining overall manufacturing feasibility.
Solution Approach 2:
The invention creates a dynamic tear propagation system where the weakened lines are designed to adapt to slight variations in positioning. The line pattern is configured so that even with manufacturing variations, the tear force naturally follows the intended path through the weakened lines, making the system tolerant of dynamic positioning errors during manufacturing.
3Ease of operation
If laser power is increased to weaken lines to significant depth, then tear initiation is improved, but energy consumption increases
Solution Approach 1:
The invention applies partial action by creating weakened lines to a moderate depth rather than maximum depth. This partial weakening is sufficient to enable easy tearing when combined with the geometric configuration of multiple lines, avoiding excessive laser energy consumption while still achieving the desired tear initiation and controlled propagation effects.
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 design enables easy and controlled tearing of a pouch portion, even with film shifts during manufacturing, ensuring accurate alignment and reducing the need for excessive force, thus preventing contents spillage and improving user convenience.
Implementation Method 1
Lasers are widely used to create the lines of weakness
Data Source
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AI summary
Pouches with easy-tear lines of weakness may be faced with difficult tear-initiation and un-controlled tear-propagation. Pouches formed on FFS machines may have mis-aligned lines of weakness as the film is known to shift on the machines. The tear initiation notches may also be mis-aligned with weakened lines. It has been determined that this problem may be solved by having a plurality of at least partly non-linear weakened lines where at least two of the weakened lines converge into a single line. This feature allows for controlled and guided tear-propagation so that a portion of the pouch may be removed easily. Disclosed is a pouch with a continuous edge or plurality of edges, the pouch having plurality of weakened lines starting from the continuous edge or from one of the edges; wherein the plurality of weakened lines are at least partly non-linear and at least two lines converge to form a single weakened line.