Double Return Valve Bag Sealing Mechanism
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Solution Overview
Problem
Existing valve bags suffer from poor sealing effects, leading to discharge of filling material into the valve hose during and after filling, and may unintentionally close or stick partially, compromising the secure closure of the valve.
Innovation Solution
A double check valved bag design featuring a tubular structure formed by folding the valve sheet and return sheet, with the return sheet protruding into the bag's interior to prevent filling material from entering the valve hose, and a heat-sealable layer for secure closure, ensuring the valve remains open during filling and closes tightly after filling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single valve sheet with an outward-pointing flap is used, then the sealing effect of the filling opening is improved, but filling material can still discharge into the valve hose during and after filling
Solution Approach 1:
The single valve sheet is divided into two separate valve sheets (first and second valve sheets), each with its own return flap structure. This segmentation creates a double-check valve system where the first return prevents material from entering the valve hose during filling, and the second return prevents material from discharging after filling, thereby resolving the contradiction between sealing effect and material discharge prevention.
Solution Approach 2:
The return flaps are pre-positioned and pre-configured in the valve sheets before filling occurs. The first return is already in place to prevent material entry during filling, and the second return is positioned to prevent post-filling discharge. This preliminary action ensures that the sealing mechanism is active before the harmful discharge can occur.
2Ease of manufacture
If the valve structure is simplified for ease of manufacture, then production cost decreases, but the valve may unintentionally close or stick partially
Solution Approach 1:
A release agent is applied as an intermediary substance between the valve sheets and the filling material. This release agent prevents the filling material from adhering to the valve sheets, thereby preventing unintentional closing or partial sticking of the valve. The release agent maintains the simplicity of the valve structure while ensuring reliable valve closure by eliminating adhesion-related sticking issues.
3Reliability
If the return flaps are extended to cover the entire valve hose, then sealing effectiveness increases, but the device complexity increases
Solution Approach 1:
Instead of extending return flaps uniformly across the entire valve hose (which would increase complexity), the return flaps are strategically positioned at critical locations: the first return is positioned to prevent material entry during filling, and the second return is positioned to prevent post-filling discharge. This local quality approach achieves effective sealing at key points without the need for continuous coverage, thereby maintaining structural simplicity while ensuring sealing effectiveness.
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 filling material from escaping into the valve hose, ensures secure closure of the valve, and prevents unintentional closing or sticking, while allowing for trouble-free filling and storage of bulk goods.
Implementation Method 1
a heat-sealable layer for secure closure
Implementation Method 2
heat-sealable layer... ensures secure closure of the valve
Data Source
Figure 1
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AI summary
The invention relates to a bag having a valve consisting of a first slip with a backflow preventer, characterized in that a second slip with a backflow preventer is attached inside the valve.