Venting Base With Cross-Lamination Recesses For Valve Bag Airflow
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Solution Overview
Problem
Multi-layer valve bags used for bulk goods face challenges in ventilation capacity, particularly at the valve base, which affects filling speed and stability, especially when outer material layers become airtight or watertight for protection, reducing air permeability and increasing internal pressure during filling.
Innovation Solution
Designing the valve base as a ventilation base with side flaps that have cutouts and a gap between them, allowing air to escape between material layers, and using an innermost air-permeable layer for enhanced ventilation, while maintaining stability and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the outer material layers are made airtight or watertight for protection, then the protection of contents is improved, but the ventilation capacity is reduced
Solution Approach 1:
The patent applies different properties to different parts of the bag: the outer material layers are made airtight or watertight for protection, while the valve base is designed with specific ventilation features (cross-lamination with adhesive points, gap between flaps) to maintain ventilation capacity. This local differentiation allows each part to optimize its function without compromising the other.
2Productivity
If the ventilation capacity is increased in the area of the valve base, then the filling speed is improved, but the complexity of the base structure is increased
Solution Approach 1:
The valve base is segmented into multiple functional elements: side flaps with cross-lamination, adhesive points arranged in specific patterns, and controlled gaps between flaps. This segmentation allows the ventilation function to be achieved through a distributed system of simple elements rather than a single complex structure, maintaining manufacturability while enhancing performance.
3Strength
If the cross-lamination is applied as a continuous adhesive line, then the strength of the bond between material layers is improved, but the ventilation capacity is reduced
Solution Approach 1:
The continuous adhesive line is segmented into discrete adhesive points arranged in a specific pattern. This segmentation creates pathways for air to escape between the material layers while maintaining sufficient bonding strength at the adhesive points, thus resolving the contradiction between bond strength and ventilation capacity.
Solution Approach 2:
Different regions of the cross-lamination serve different functions: areas with adhesive points provide strong bonding, while areas between adhesive points provide ventilation pathways. This local differentiation allows the same cross-lamination structure to simultaneously achieve both bond strength and ventilation capacity.
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
This configuration significantly increases ventilation capacity, allowing for faster filling without reducing speed at the end of the process and enables cost savings through material reduction, while ensuring the bag's stability and protection of contents.
Implementation Method 1
the cross-lamination in the area of both side flaps of a venting base has recesses through which air can escape from the space between the material layers bonded by the cross-lamination
Data Source
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AI summary
The invention relates to a valve bag for bulk material, comprising a stand base and a valve base opposite the stand base. A valve for filling the valve bag is incorporated into the valve base, and the bag is made of a two- or multilayer blank made of a flat material, in particular paper. The blank has a transverse adhesive bonding along at least one of the base-side edges of the blank, said transverse adhesive bonding connecting adjacent material layers together. The invention is characterized in that at least one of the bases with a transverse adhesive bonding is designed as a ventilation base that has a base fold in which lateral flaps are folded around lateral folding lines running in a base longitudinal direction in order to form the base. The width of the lateral flaps is designed such that a gap remains between the lateral flaps when the ventilation base is folded closed, and the transverse adhesive bonding has recesses in the region of the two lateral flaps of the ventilation base, said recesses forming an outlet for air leaking out of the intermediate space between the material layers.