Side-Gusset Bag Overlap Positioning for Sealing and Aesthetics
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Solution Overview
Problem
Side-gusset bags made of plastic/fabric laminate face challenges in achieving a tight seal due to their fabric structure, limiting design possibilities and aesthetics, especially when trying to close them peripherally or position adhesive overlaps.
Innovation Solution
A method involving forming a simple tube from a continuous web with overlapping edges, using adhesives or fusible polymers to close it, and then shaping it into a gusseted tube with freely positionable overlaps, allowing for better design flexibility and aesthetic appeal by placing the overlap within the gusseted section, rather than centrally on the back panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the continuous web is closed peripherally with adhesive overlap on the back panel, then the bag can be sealed, but the appearance is poor and design possibilities are limited
Solution Approach 1:
The adhesive overlap is pre-positioned within the gusseted section during the tube forming stage, before the gussets are created. This preliminary positioning ensures the overlap ends up in an aesthetically acceptable location within the folded gussets rather than prominently on the back panel.
Solution Approach 2:
The overlap is moved from the two-dimensional back panel surface into the three-dimensional gusseted section. By utilizing the additional spatial dimension created by the gusset folds, the overlap is concealed within the folded structure rather than being visible on the external surface.
2Volume of stationary object
If the plastic fabric is used for the bag body, then the bag can be made with large volume and heavy weight capacity, but tight sealing is not possible due to fabric structure
Solution Approach 1:
The bag utilizes a composite construction where the plastic fabric provides the main body structure for large volume and heavy weight capacity, while the adhesive bonding system provides the tight sealing function. The composite approach allows each material to perform its optimal function without compromise.
Solution Approach 2:
The adhesive acts as an intermediary bonding agent that creates tight seals between the edges of the plastic fabric. Rather than attempting to thermally weld the fabric directly, the adhesive mediates the joining process to achieve reliable sealing.
3Ease of manufacture
If the overlap is positioned centrally on the back panel, then the tube can be easily closed, but the design flexibility and printing possibilities are significantly limited
Solution Approach 1:
The tube is formed and the overlap is positioned within the gusseted section before final bag assembly. This preliminary action allows the overlap to be placed in a location that does not interfere with printing areas or design elements on the back panel.
Solution Approach 2:
The overlap is extracted from its traditional central back panel location and repositioned within the gusseted section. This extraction removes the constraint that previously limited design flexibility and printing possibilities.
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
Enables the production of side-gusset bags with improved sealing, design flexibility, and aesthetic appeal, suitable for large volumes and heavy weights, while maintaining recyclability and ease of printing on the outer surface.
Implementation Method 1
a first face of the continuous web at the respective outer edge strip being connected with the inner edge strip of a second face by an adhesive in order to peripherally close the gusseted tube
Implementation Method 2
an application of a fusible polymer is also suitable as an adhesive, having the effect of a bonding upon the application of force to the overlap
Data Source
AI summary
The invention relates to a flat-lying side-gusset bag made of a plastic fabric composite (2) and to a method for the production thereof. The side-gusset bag has opposing front walls (3a, 3b), side gussets (4a, 4b) introduced in between said front walls (3a, 3b), and folding edges (5) between the front walls (3a, 3b) and the side gussets (4a, 4b). Peripheral sections of the plastic fabric composite (2) are connected together in an overlapping region (10) at a longitudinal seam, wherein the plastic fabric composite (2) has a plastic fabric (7) and at least one closed plastic layer. The side gussets (5) extend, in the case of the flat-lying side-gusset bag, in each case over at most ⅓ of the width of the front walls. According to the invention, the overlapping region (10) is arranged off-center on one of the front walls (3a, 3b) at least partially over one of the side gussets (4a, 4b) or at one of the side gussets (4a, 4b). In order to be able to form such a side-gusset bag, in the production method, first of all a closed, two-layer tube (12) is formed, from which a side-gusset tube (1) is subsequently formed.