Packaging Bag Perforation and Welding for Diaper Sealing
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Solution Overview
Problem
Conventional packaging bags for compressed items like diapers are difficult to open and cannot be easily resealed once opened.
Innovation Solution
A packaging bag design featuring a strategically placed perforation line within the upper half, reinforced with welded ends and a carrying handle above, allowing easy opening and resealing, with a material ratio that balances strength and ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the packaging bag is securely closed with welds, then the sealing reliability is improved, but the difficulty to open increases
Solution Approach 1:
The packaging bag is divided into two distinct regions: an upper sealed region with strong welds for secure closure, and a lower perforated region designed for easy opening. This segmentation allows the bag to provide both reliable sealing and easy access without compromise.
Solution Approach 2:
Different regions of the bag are given different properties: the upper part has high-strength welds for secure sealing, while the lower part has perforations that reduce strength intentionally to enable easy tearing. This local differentiation resolves the contradiction between secure closure and easy opening.
2Ease of operation
If the perforation line allows easy opening, then the ease of operation is improved, but the risk of unintentional tearing increases
Solution Approach 1:
The bag is segmented into a sealed upper region and a perforated lower region. The perforation line is strategically positioned and bounded by welds, creating a controlled weak point that directs opening force precisely, preventing unintended tearing while maintaining ease of opening.
Solution Approach 2:
Welds are placed at the endpoints of the perforation line to prevent the tear from propagating beyond the intended opening area. This preliminary protective measure counteracts the potential harmful effect of the perforation's reduced strength.
3Ease of operation
If the perforation line is arranged to allow easy opening, then the ease of operation is improved, but the structural integrity under internal pressure deteriorates
Solution Approach 1:
The bag structure is differentiated into regions: the upper sealed region maintains full structural integrity to withstand internal pressure, while the lower perforated region is locally weakened only where needed for opening. The perforation pattern and bounding welds ensure pressure resistance is maintained in critical areas.
Solution Approach 2:
By segmenting the bag into sealed and perforated zones, the design allows the majority of the structure to remain intact and pressure-resistant, while only a controlled portion is weakened for opening functionality.
4Strength
If the carrying handle is reinforced with folds and welds, then the strength is improved, but the device complexity increases
Solution Approach 1:
The carrying handle is formed by integrating folds and welds directly into the bag structure itself, rather than adding a separate handle component. This merging approach reinforces the handle while minimizing additional complexity.
Solution Approach 2:
The film material serves multiple functions: it forms the bag body, creates the carrying handle through folding and welding, and provides structural reinforcement. This multi-functionality reduces the need for additional components.
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 bag can be securely opened and closed, preventing unintentional tearing and maintaining integrity under internal pressure, while facilitating easy handling and gradual content removal.
Implementation Method 1
the two bag films of which are closed by longitudinal and transverse welds to form the bag
Implementation Method 2
The packaging bag can be easily opened along the perforation line
Data Source
Figure 1~2
Figure 3~4
AI summary
Packaging bag (31) formed by welding one or more layers of film for holding items such as diapers or the like, which are preferably compressed, characterized in that at least one layer (3) is provided with a perforation line (5) which runs between two edge areas (8,9).