Stackable Valve Bag with Concentric Filling Device
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Solution Overview
Problem
Stackable valve bags with existing filling devices often result in uneven thickness along the filling direction due to perpendicular layering, leading to inclined stacking, which causes delays and material loss during automatic filling processes.
Innovation Solution
A valve bag design featuring a filling device with two concentrically arranged slips of paper, where the outer slip is shorter and has a setback, forming a hose-like structure with a valve that is reinforced and closed using a weldable material, ensuring uniform thickness and stability for horizontal stacking and smooth filling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two or more sheets with fold-back sections are stacked perpendicular to the filling device, then the valve is reinforced and sealing is improved, but the thickness varies along the filling direction causing inclined stacking
Solution Approach 1:
The patent applies nesting by placing the first sheet inside the second sheet, with both sheets arranged concentrically around the filling device. The first sheet has its free end inserted into the second sheet, creating a nested configuration that distributes layers radially rather than stacking them perpendicular to the filling direction. This nesting arrangement maintains uniform thickness along the filling direction while still providing reinforced valve sealing through multiple concentric layers.
2Strength
If multiple sheets are stacked perpendicular to the filling device, then the valve structure is strengthened, but the bags cannot be properly suctioned into the magazine causing filling delays and material loss
Solution Approach 1:
The nested concentric arrangement of sheets allows the valve base to maintain a uniform external profile along the filling direction, enabling proper suction into the magazine without the inclined stacking problem. The valve structure is strengthened through multiple concentric layers that provide reinforcement without increasing the overall height perpendicular to the filling direction.
Solution Approach 2:
The patent transitions from stacking sheets in a perpendicular dimension to arranging them in concentric circular dimensions around the filling device. This dimensional change from linear stacking to radial arrangement maintains structural strength while preserving uniform thickness along the filling direction, enabling smooth operation in automatic filling systems.
3Shape
If the outer sheet is made shorter than the inner sheet, then uniform thickness is achieved for horizontal stacking, but the non-return feature must be positioned specifically
Solution Approach 1:
The patent applies local quality by making the first sheet shorter than the second sheet specifically in the region where the free end is inserted into the second sheet. This localized length difference enables the non-return feature to be positioned at the correct location while maintaining uniform overall thickness. The specific dimensioning of the first sheet's free end insertion depth creates the necessary non-return functionality without compromising the uniform external profile.
Data Source
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AI summary
Valve bag containing a filling device with valve inserted into a bottom fold of a valve base formed from corner fold and side flaps, wherein the filling device with valve contains or consists of at least two sheets folded to form a tube, which are arranged concentrically within each other with respect to the filling direction and the first, outer sheet has a backflow with respect to the filling direction and is shorter than the second, inner sheet.