Square-bottomed Packaging Bag Folding Structure
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Solution Overview
Problem
The existing square-bottomed packaging bags with ridge line portions formed by heat sealing have a larger actual bottom surface area than the content-accommodating portion, leading to low display efficiency and unsatisfactory external appearance, and can interfere with each other when displayed in multiples, causing instability.
Innovation Solution
A square-bottomed packaging bag formed from a one-piece soft packaging material with specific folding and sealing techniques, including side seal portions, bottom seal portions, and butt-joint seal portions, which allows the bag to stand stably and maintain a flat placement surface, reducing waste and enhancing appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If ridge line portions are formed by heat sealing between front surface and bottom surface, and between rear surface and bottom surface, then the packaging bag can be formed from one-piece soft packaging material, but the ridge line portion broadens in horizontal direction causing actual bottom surface area to be larger than content-accommodating portion area
Solution Approach 1:
The patent extracts the ridge line portion formation from the heat sealing process. Instead of forming ridge lines through heat sealing that cause broadening, the invention uses folding to create the bottom surface and side surfaces, eliminating the need for ridge line heat sealing and thus preventing the bottom surface area from being larger than the content-accommodating portion area.
Solution Approach 2:
The patent inverts the conventional approach by using folding instead of heat sealing to form the bag structure. The one-piece soft packaging material is folded to form the bottom surface and side surfaces, rather than heat sealing ridge lines to create the same structure, thereby achieving precise dimensional control.
2Stability of the object's composition
If ridge line portions are formed by heat sealing, then the packaging bag structure is stabilized, but display efficiency is low and external appearance is not satisfactory due to broadening of ridge line portion
Solution Approach 1:
The patent removes the heat-sealed ridge line portions that cause external appearance defects. By using folding to form the bag structure, the invention eliminates the broadened ridge lines that interfere with display efficiency and compromise external appearance, while still maintaining structural stability through the folded geometry.
Solution Approach 2:
The patent inverts the structure formation method from heat sealing to folding. This inversion allows the bag to maintain structural stability through geometric folding while achieving a clean external appearance without broadened ridge lines, thereby improving both display efficiency and aesthetic quality.
3Productivity
If multiple square-bottomed packaging bags are displayed, then product display is enabled, but ridge portions interfere with each other causing display state to become unstable
Solution Approach 1:
The patent extracts the problematic ridge line portions that cause interference between multiple bags. By forming the bag structure through folding rather than heat sealing, the invention eliminates the protruding ridge lines that interfere with adjacent bags during display, thereby stabilizing the display state and improving display efficiency.
4Ease of manufacture
If conventional heat sealing method is used to form ridge lines, then manufacturing process is simple, but film waste increases and external appearance is compromised
Solution Approach 1:
The patent extracts the heat sealing step that causes film waste. By using folding to form the bag structure from the one-piece soft packaging material, the invention eliminates the need for additional heat sealing operations that would require extra film or adhesive, thereby reducing film waste while maintaining manufacturing simplicity.
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 provides a packaging bag with improved external appearance, stability, and self-standing properties, preventing interference when displayed in multiples, while minimizing film waste and maintaining a flat surface for better display and storage.
Implementation Method 1
a heat fusion layer 82 formed on one surface of the base material layer 81 and configured to form an inner layer of the square-bottomed packaging bag 1
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A square-bottomed packaging bag (1) of the present invention is a square-bottomed packaging bag formed by bending a one-piece soft packaging material and includes a quadrangular bottom surface (10), a front surface (20) and a rear surface (30) standing from two opposite sides of the bottom surface, and a left side surface (40) and a right side surface (50) connecting the front surface and the rear surface, in which each of the left side surface and the right side surface includes a first region (41, 51) positioned on the front surface side, a second region (42, 52) positioned on the rear surface side, and a side-surface-joining portion (43, 53) joining the first region and the second region.