Gusseted Bag Flat Bottom via Heat-Sealed Film Section
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Solution Overview
Problem
Conventional methods for producing gusseted bags with a reclosure on a gusset often result in bags that tend to tilt during filling, transport, and storage due to an uneven bottom, and require additional work steps and material for forming a reinforced double-walled bottom to mitigate this issue.
Innovation Solution
A method involving a longitudinal process where incisions are made in the bag film to form a gusseted tube, allowing the first front wall to be partially folded over and a separate film section to be connected via heat-sealed seams to create a flat bottom, ensuring the bag stands upright and facilitating easy handling and dosing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a reinforced double-walled bottom is formed by additional work steps, then the bag stability is improved, but the manufacturing complexity and material consumption increase
Solution Approach 1:
The bottom formation process is segmented into distinct steps: creating the initial bottom from the gusseted tube, then adding a separate reinforced bottom section. This allows each part to be optimized independently - the main bottom provides basic stability while the added reinforced section enhances load-bearing capacity without requiring complete redesign of the entire bottom structure.
Solution Approach 2:
The incisions are made in the bag film before the bottom formation process, allowing the first front wall to be pre-positioned and folded over. This preliminary action simplifies the subsequent bottom formation by pre-establishing the geometry needed for the reinforced double-walled structure, reducing the complexity of the actual bottom formation step.
2Stability of the object's composition
If a reinforced double-walled bottom is formed by additional work steps, then the bag stability is improved, but the material consumption increases
Solution Approach 1:
The reinforced bottom is merged with the existing gusseted tube structure through heat-sealed seams that integrate the separate film section with the folded first front wall and the second front wall. This merging creates a unified double-walled bottom structure that provides enhanced stability while using material efficiently by leveraging the existing folded geometry rather than adding completely separate reinforcement elements.
3Shape
If incisions are made and first front wall is folded over with separate film section connected, then the bottom flatness is improved, but the manufacturing steps increase
Solution Approach 1:
The mechanical folding and joining operations are replaced by heat-sealing processes. The separate film section is connected to the folded first front wall and second front wall via heat-sealed seams, which provides a more reliable and consistent connection than mechanical fastening while maintaining the flat bottom geometry. This thermal joining method simplifies the manufacturing steps by eliminating the need for complex mechanical assembly operations.
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 method enables gusseted bags to be produced with a stable, flat bottom that prevents tilting, improves handling, and allows for precise dosing and reclosure, enhancing the overall functionality and material efficiency of the bags.
Implementation Method 1
a separate film section being connected to the folded-over section of the first front wall and the exposed side folds and the second front wall via connecting seams, in particular heat-sealed seams
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
The invention relates to a side-gusseted bag with two opposing front walls (1a, 1b), a first and a second side gusset (2a, 2b) which extend opposite each other along a longitudinal direction (I) of the bag and connect the two front walls (1a, 1b) to each other. Furthermore, a resealing device with at least one resealing strip (6) is provided, wherein the resealing device is arranged in the region of the first side gusset (2a), extends along a transverse direction (q) of the bag only over a portion of the width of the front walls (1a, 1b), and allows the first side gusset (2a) to be folded out to form a resealable opening. According to the invention, a separate film section (11) is provided to form a flat bottom, which is connected to the lower ends of the front walls (1a, 1b) and the side gussets (2a, 2b) via heat-sealing seams (12a, 12b).The invention also relates to a method for manufacturing a side-gusseted bag. To be published with Fig. 2.