Food Packaging Bag Bottom Stability via Segmented Welding
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Solution Overview
Problem
Preformed plastic packaging bags for food products lack stability when filled, leading to potential overturning during transport and storage, which is critical for maintaining the integrity of the packaged contents.
Innovation Solution
A method of continuously manufacturing the bags involves producing lateral bellows between two walls with specific welding patterns, including longitudinal, transverse, and oblique weld lines, followed by cutting triangular areas to create a stable bottom with clearance triangles on either side, enhancing vertical stability without adding extra thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the bottom is formed by folding operations, then the manufacturing process is simple, but the bag lacks stability in vertical position
Solution Approach 1:
The bottom is divided into multiple welded sections (first welded section and second welded section) connected by bellows, creating a segmented structure that provides both manufacturing simplicity and vertical stability through the distributed weld points and expandable bellows sections
Solution Approach 2:
The bellows are designed to expand in the radial direction when filled, transforming the flat folded bottom into a three-dimensional stable base that provides vertical stability while maintaining the simplicity of the initial folding operation
2Stability of the object's composition
If the bellows are spaced to form a support base, then vertical stability is improved, but the bag thickness increases
Solution Approach 1:
The bellows are positioned specifically at the bottom corners where support is needed, providing localized stability enhancement without adding thickness to the entire bag structure. The welded sections and bellows create support only where required for vertical stability
3Stability of the object's composition
If the bottom is made with extra thickness for stability, then vertical position stability is improved, but the aesthetics and labeling capability are reduced
Solution Approach 1:
The bottom is segmented into welded sections connected by bellows, creating a structured support base that provides stability while maintaining a clean, label-friendly surface area. The segmentation allows the label to be placed on the flat bottom surface without interference from thick structural elements
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 improves the stability of the bags in a vertical position, reduces thickness, and allows for aesthetic enhancements such as labeling, while maintaining a compact and efficient manufacturing process.
Implementation Method 1
the plastic film is continuously subjected to successive folding and welding operations
Data Source
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AI summary
Method for continuously manufacturing a bag for packaging food products from a sheet of plastic film, according to which: -the film is subjected to successive folding operations so as to produce lateral gussets (1c, 1d) between two walls (1a, 1b), -a longitudinal weld line (L1) is made at the connection of the external edges of the gussets (1c, 1d) to the walls (1a, 1b), -a transverse weld line (L2) forming a bottom (1e) is made at regular intervals, -an oblique weld line (L3) is made at regular intervals between the external edges of the gussets (1c, 1d) and the transverse weld line (L2) forming the bottom (1e), -a triangular zone produced by the oblique weld lines (L3) and the bottom (1e) is cut out, -a cut is made at the bottom (1e) having symmetrically, on both sides, oblique lines so as to form a bag opening.