Valve Bag Ventilation Pocket Inversion for Reliable Air Exchange
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Solution Overview
Problem
Existing valve sacks with inward-facing ventilation pockets face issues with reduced venting surface area due to pressure or filler weight, and risk material damage from sharp fillers, leading to unreliable venting during filling.
Innovation Solution
A valve sack design featuring an external thermal valve with a pocket-shaped ventilation chamber made from air-permeable material, ensuring air escape while preventing filler entry, with the pocket opening inside the sack and being closed to the outside, and using a slip or filter material for air permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If an inward-facing ventilation pocket is used, then the bag structure is compact, but the venting surface area is reduced and venting reliability deteriorates under pressure or filler weight
Solution Approach 1:
The patent inverts the conventional inward-facing pocket design by creating an outward-facing ventilation pocket. This inversion allows the pocket to protrude away from the filler, preventing compression by filler weight and maintaining a consistent venting surface area throughout the filling process, thereby resolving the contradiction between compact structure and venting reliability.
Solution Approach 2:
The ventilation pocket is designed to extend in the radial direction outward from the bag wall, creating a three-dimensional structure that increases the effective venting surface area without significantly increasing the overall bag volume. This dimensional approach allows the pocket to maintain its venting capability even when the bag is filled.
2Device complexity
If an inward-facing ventilation pocket is used, then the bag structure is simple, but the material is damaged by pointed or sharp-edged filler
Solution Approach 1:
By inverting the pocket orientation to face outward, the design eliminates direct contact between the filler and the pocket material. The pocket wall acts as a protective barrier, and the outward orientation ensures that sharp or pointed filler cannot penetrate or damage the pocket structure, thereby resolving the contradiction between simplicity and protection from harmful factors.
3Use of energy by moving object
If the venting pocket is made air-permeable, then air exchange is improved, but filler leakage risk increases
Solution Approach 1:
The patent employs air-permeable material with controlled porosity for the ventilation pocket. This material allows air and gases to pass through freely while the pore structure is designed to block larger filler particles. The porous material thus enables air exchange while preventing filler leakage, resolving the contradiction between breathability and containment.
Solution Approach 2:
The ventilation pocket uses locally differentiated material properties: the pocket wall is made air-permeable to facilitate ventilation, while the outer surface or specific regions may have different properties to prevent filler escape. This localized quality approach allows simultaneous achievement of air exchange and filler containment.
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
Ensures safe and constant venting throughout the filling process, protecting the material from filler damage and maintaining optimal air exchange without filler leakage, suitable for various bag models and easy installation.
Implementation Method 1
a piece of air-permeable material, which is preferably referred to as a slip, which only ensures the passage of air or other similar gaseous substances
Implementation Method 2
the filling device comprises a thermal valve. This is a valve that is coated with plastic so that after the paper bag has been filled, it can be closed thermally
Data Source
Figure 1
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AI summary
The valve bag (1) has a filler device (6) and two ventilation devices (5). The filler device surface that facing to exterior of bag portion, is positively connected to ventilation device surface that facing interior. The portion of surface of ventilation device is formed as inner bottom surface of bag portion. One ventilation device is formed in form of ventilation chamber along bottom portion and is closed on side of filler device. Another ventilation device is arranged between bottom impact plate and two tabs (11,12) on side wall (2) of bag portion.