Plastic Fabric Composite Bag Tearing via Segmented Punching
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Solution Overview
Problem
Existing plastic fabric composite bags face issues with uneven tearing and risk of premature tearing due to perforation webs, and the use of lasers for creating lines of weakness is costly and limited by material absorption requirements.
Innovation Solution
A plastic fabric composite with a strip fabric, an outer film, and a plastic intermediate layer, where a line of weakness is created by punching, completely severing the strip fabric and ending in the intermediate layer, ensuring the outer film remains undamaged, allowing for clean and uniform tearing without the need for lasers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a perforation is formed by punching through the plastic fabric composite, then separation of successive bags is enabled, but the perforation webs cannot be easily separated and frays form
Solution Approach 1:
The punching line is segmented to completely sever the strip fabric while leaving the outer film intact, creating discrete separation points that enable bag separation without compromising the strip fabric structure
Solution Approach 2:
The punching line creates localized weakness only in the strip fabric layer, while the outer film remains undamaged, providing different properties to different layers at the same location to achieve both separation and integrity
2Reliability
If the perforation webs are made smaller to reduce frays, then the plastic fabric composite may tear at the perforation in an uncontrolled manner
Solution Approach 1:
The strip fabric is pre-severed by the punching line to create a controlled weakness point, ensuring that subsequent tearing follows a predictable path along the punching line without uncontrolled propagation
Solution Approach 2:
The punching line acts as an intermediary structure that mediates between the outer film and strip fabric, providing a controlled separation path that prevents uncontrolled tearing while maintaining clean edges
3Manufacturing precision
If a laser is used to generate a line of weakness, then partial cutting through the plastic fabric composite can be ensured, but the equipment outlay is high and material selection is limited
Solution Approach 1:
The patent replaces the laser-based thermal cutting system with a mechanical punching system, eliminating the need for complex laser equipment while achieving the desired partial cutting effect through mechanical force applied to the punching line
Solution Approach 2:
The punching line extracts only the necessary function of creating a weakness point from the complex laser system, achieving the same effect with a simpler mechanical approach that does not require precise thermal control or specialized material properties
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
This method enables clean, uniform tearing with reduced risk of uncontrolled tearing, maintaining the integrity of the outer film and allowing for efficient manufacturing of packaging bags with controlled tear-open behavior and air-tight closure.
Implementation Method 1
a line of weakness in the form of a punching line... The strip fabric is completely severed along the punching line, the punching line ends in the intermediate layer and the outer film at the punching line is undamaged
Data Source
AI summary
A plastic fabric composite for a plastic fabric composite bag has a strip fabric, an outer film, a plastic intermediate layer disposed between the outer film and the strip fabric, where a line of weakness in a form of a punching line is included, where the strip fabric is completely severed along the punching line, where the punching line ends in the intermediate layer and where the outer film is undamaged at the punching lines.