Spray Cannister Bag Anchoring Column Even Inflation
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Solution Overview
Problem
Existing propellant-based aerosol dispensers face issues such as mechanical stress on bags during filling, pinhole bursts, tearing, and uneven inflation due to the need for the bag to inflate while being restrained, leading to potential failure of the bag and elastic sleeve.
Innovation Solution
A central anchoring column is used to fold the bag at multiple points around its circumference, allowing it to unfold evenly during filling, eliminating the need for welding and aluminum foil, and providing a direct mechanical connection to the dispensing valve, ensuring even pressure distribution and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the bag is filled while restrained by the elastic sleeve, then the bag can be filled with material under pressure, but the bag experiences mechanical stress leading to tearing and pinhole bursts
Solution Approach 1:
The bag is divided into multiple segments or lobes that can inflate independently and sequentially. This segmentation allows the bag to expand in a controlled manner, distributing the mechanical stress across multiple sections rather than concentrating it on a single structure, thereby preventing tearing and pinhole bursts during filling.
Solution Approach 2:
The elastic sleeve is pre-stretched and positioned around the bag before filling begins. This preliminary action creates a controlled restraint system that gradually releases as the bag fills, allowing the bag to expand smoothly without sudden stress spikes that would cause damage.
2Manufacturing precision
If the bag is constrained during filling, then the filling process can be controlled, but uneven inflation occurs leading to potential failure
Solution Approach 1:
The bag is designed with multiple lobes or segments that inflate in a sequential or synchronized manner. This segmentation ensures that each section receives material evenly and expands uniformly, preventing localized stress concentrations and maintaining overall inflation stability throughout the filling process.
Solution Approach 2:
The elastic sleeve's mechanical properties are optimized to provide progressive restraint during filling. The sleeve's elasticity and stiffness are carefully selected to allow controlled expansion while maintaining uniform pressure distribution, ensuring even inflation without compromising filling control.
3Strength
If welding is used to attach the bag to the valve assembly, then the connection is secure, but the welded areas become weak points with less resistance to mechanical stresses
Solution Approach 1:
The welding process is completely eliminated from the bag construction and attachment process. Instead of welding the bag to the valve assembly, the invention uses mechanical attachment methods such as flanges, clips, or interference fits. This extraction of the welding step removes the weak welded seams that would otherwise be susceptible to mechanical stress and failure.
Solution Approach 2:
The bag is designed as a disposable component that is mechanically attached to the valve assembly rather than permanently welded. This allows for simpler, more reliable attachment that can be easily replaced when needed, eliminating the reliability issues associated with welded connections that are difficult to repair or replace.
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 prevents tearing and strain on the bag during filling, maintains even inflation, and enhances the bag's barrier properties, ensuring reliable and consistent dispensing without propellants, while allowing for high mechanical strength and resistance to mechanical forces.
Implementation Method 1
an elastic sleeve surrounding the bag for filling with fluid for dispensing... the sleeve and bag being sized and positioned relative to one another so that elastic contraction of the sleeve compresses the bag
Implementation Method 2
the bag having a circumference and being folded with overlapping folds at a plurality of folding locations around said circumference, thereby to unfold evenly under said sleeve during a filling process of pressurized filling of said bag with fluid
Data Source
AI summary
A fluid dispensing mechanism for a fluid dispensing device, comprising an elastic sleeve surrounding a bag for filling with fluid for dispensing, the bag having a circumference and being folded at a plurality of folding locations around said circumference, thereby to unfold evenly under said sleeve during a filling process of pressurized filling of said bag with fluid, the mechanism further comprising an anchoring column. The bag is folded around the anchoring column.