Gusseted Bag Corner Welds for Moisture-Resistant Venting
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Solution Overview
Problem
Existing open gusseted sacks face challenges in preventing the ingress of moisture and water while allowing air to escape, as current ventilation designs often lead to penetration of external moisture into the sack.
Innovation Solution
A modified corner weld seam arrangement featuring parallel and angled welds, with ventilation channels designed as labyrinths to deflect and change the air flow direction, ensuring air can escape without allowing water or moisture to enter, and using ventilation openings in the outer layers that can be closed to prevent moisture ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If ventilation openings are provided in the film or gusset layers to allow air escape, then air can escape from the filled sack, but moisture or water can penetrate through the vent openings into the interior of the sack
Solution Approach 1:
The corner weld seam is segmented into multiple sections with interrupted welding, creating discrete ventilation channels rather than continuous welds. This segmentation allows air to escape through the gaps while maintaining structural integrity in other areas.
Solution Approach 2:
The ventilation channels are designed to extend in multiple spatial dimensions, creating a labyrinthine path that air can traverse. The channels run parallel to corner welds and connect to ventilation openings in the gusset layers, utilizing three-dimensional space to create an effective venting pathway that is not simply a straight line.
2Object-affected harmful factors
If complex ventilation designs with labyrinth channels are implemented, then moisture penetration is reduced, but the device complexity increases
Solution Approach 1:
The corner weld seam serves multiple functions simultaneously: it provides structural support at the sack corner, creates ventilation channels through its interrupted design, and defines the geometry for air flow patterns. This multi-functionality reduces the need for separate dedicated ventilation components.
Solution Approach 2:
The weld seam arrangement itself generates the ventilation functionality without requiring separate ventilation components. The interrupted welding pattern automatically creates channels that exploit the filling process dynamics to vent air while preventing moisture ingress through the resulting flow patterns.
3Productivity
If ventilation openings are provided in the gusset layers, then air can escape effectively, but the sack structure becomes more complex and manufacturing more difficult
Solution Approach 1:
The ventilation channel creation is merged with the corner welding process itself. The interrupted weld pattern that creates ventilation channels is integrated into the standard corner sealing operation, eliminating the need for separate ventilation opening creation steps.
Solution Approach 2:
The ventilation channels are pre-formed during the welding process before filling occurs. The interrupted corner welds create the ventilation pathways in advance, so that during filling air can immediately escape through the pre-established channels without requiring additional actions.
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 design effectively prevents the entry of water or moisture while allowing air to escape, reducing dust formation and improving stackability by ensuring the air flow is diverted multiple times, thus separating entrained product and minimizing moisture penetration.
Implementation Method 1
the corner welding seams are designed in such a way that the air can escape from the inside of the filled sack
Implementation Method 2
parallel to the corner welds and at a small distance from them run obliquely inwards from the outer edges... These welds can vary in length
Data Source
Figure 1~3
Figure 4~6
Figure 7~8
AI summary
The sack (1) is preferably closed at one end and has venting openings (3) at the opposite end that can be closed after the filling process, whereby at least the edge regions bounding on the fill opening have one or more corner weld seams (5-8) and there is at least one fill opening. At least one corner or several corners, preferably all four corners, has or have at least one corner weld seam as a weld seam arrangement forming a venting channel.