Bag Ventilation Device With Spacer Flow Cross-Sections
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Solution Overview
Problem
Existing ventilation systems for bags face challenges in allowing air to escape while preventing moisture ingress, particularly due to complex production methods and limited flexibility, which can lead to impaired bag shape and stackability.
Innovation Solution
A ventilation device comprising a dust protection layer, a fluid-tight outer layer, and a spacer device with through-openings that create free cross-sections of flow, allowing air to escape while preventing moisture entry, and optionally featuring reactivatable adhesives or wax dots for closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a labyrinth seal configuration is used in the bag seam for ventilation, then air can escape from the bag, but the production becomes complex and the ventilation cannot be provided flexibly on the bag
Solution Approach 1:
The ventilation function is segmented from the bag seam structure and implemented as a separate ventilation device that can be independently positioned and applied to different locations on the bag, enabling flexible ventilation without complex seam configurations
Solution Approach 2:
A separate ventilation device acts as an intermediary component between the bag interior and exterior, providing the ventilation function without requiring complex modifications to the bag seam or wall structure
2Reliability
If a double layer of film is used over the entire length of the bag for ventilation, then ventilation can be provided, but the material requirement increases
Solution Approach 1:
The ventilation function is extracted from the overall bag structure and implemented as a localized device at specific positions, eliminating the need for double layer film coverage over the entire bag length while maintaining effective ventilation
Solution Approach 2:
Ventilation is provided locally at specific positions on the bag using a concentrated ventilation device rather than through a continuous double layer structure, reducing overall material consumption while maintaining ventilation reliability
3Productivity
If ventilation openings are provided in the bag wall, then air can escape, but moisture ingress must be prevented
Solution Approach 1:
The ventilation device utilizes porous or micro-perforated structures that allow air molecules to pass through while blocking larger moisture droplets, enabling air removal while preventing moisture ingress
Solution Approach 2:
The ventilation device employs composite material structures combining hydrophobic and hydrophilic components that selectively permit air passage while repelling moisture, resolving the contradiction between ventilation and moisture protection
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 solution enables flexible and resource-saving ventilation that effectively removes air from bags without allowing moisture in, maintaining the bag's integrity and stackability.
Implementation Method 1
at least one free cross-section of flow is made available between the dust protection layer and the spacer device and at least one free cross-section of flow is made available between the outer layer and the spacer device, so that air can escape from the inside of the bag through the free cross-sections of flow via the ventilation opening
Data Source
AI summary
A ventilation device for introduction into a bag wall of a bag and bag with a ventilation device including a dust protection layer and a fluid-tight outer layer, wherein a ventilation opening is introduced into the outer layer is disclosed. A fluid-tight spacer device is arranged between the dust protection layer and the outer layer, wherein a free cross section of flow is made available between the dust protection layer and the spacer device and a free cross section of flow is made available between the outer layer and the spacer device, and wherein the spacer device includes at least one through-opening. In the method of production, the individual layers are made available, and spacer elements are made available by impressions.