Pinch Bottom Sack Lateral Handle Design for Load Distribution
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Solution Overview
Problem
Conventional sacks with handles integrated into the filling area face issues such as reduced mechanical properties due to high temperature welding, leading to compromised rigidity and difficulties in load distribution, which affects handling and closure mechanisms.
Innovation Solution
A pinch-bottom sack design featuring a sleeve with a mesh cover and a handle means that includes a load element extending opposite to the area element, allowing for efficient load transfer and improved rigidity, while maintaining a simple and cost-effective production process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If handles are arranged in the filling area of the sack, then load distribution is improved, but the optic of the sack is affected and closing elements cannot be properly positioned
Solution Approach 1:
The handle means is repositioned from the traditional filling area arrangement to the lateral area of the sack. This spatial relocation to a different dimension (lateral vs. top/vertical) allows the handle to provide comfortable loading while avoiding interference with the closing element and maintaining the sack's optical appearance.
2Strength
If high temperature welding is used to connect handle means, then connection strength is improved, but mechanical properties of the material are altered and rigidity is reduced
Solution Approach 1:
The patent replaces thermal joining methods (welding) with mechanical joining methods. The handle means is connected to the sack cover through mechanical fastening systems such as eyelets, grommets, or reinforced stitching that do not require high temperature welding, thereby preserving the mechanical properties and rigidity of the mesh material while achieving sufficient connection strength.
3Force
If handles are arranged parallel to the cover in the filling area, then load transfer is improved, but multiple disadvantages result including projection through closing elements and increased material requirements
Solution Approach 1:
The sack structure is segmented into distinct functional zones: the filling area for bulk goods acceptance, the lateral area for handle means placement, and the closing element area for sealing. This segmentation allows each component to perform its function optimally without interference, reducing structural complexity while maintaining load transfer efficiency.
4Force
If the load element extends opposite to the area element, then load distribution is improved, but manufacturing complexity increases
Solution Approach 1:
The load element is pre-configured during the formation of the handle means, with its extension direction and positioning predetermined. This preliminary configuration ensures that when the sack is assembled and loaded, the load force is automatically distributed optimally without requiring complex adjustments or additional manufacturing steps, thus maintaining production simplicity.
Data Source
AI summary
A pinch bottom sack fillable with bulk good includes a sleeve with at least one area element, wherein the sleeve includes a mesh and the area element a handle means including a load element at which a load force is applicable for lifting the sack, and the load element is configured such that it extends at least in some areas at least in a load condition in which the load force acts at the load element opposite to an outer side of the area element.