Vacuum Bag Forming via Pressure Differential Expansion
Solution Overview
Problem
Existing vacuum bag packaging materials are inefficient in conforming to complex shapes due to friction between filler particles and constant compressive force, limiting their ability to package non-rigid items effectively.
Innovation Solution
A forming system that uses a vacuum to expand the packaging material, allowing it to engage with a forming die and assume a desired shape, then returns to ambient pressure to compress and maintain the shape, enabling the packaging material to conform closely to the die's shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If vacuum bag packaging material is used to maintain handling rigidity through constant compressive force on filler particles, then the packaging maintains its shape during handling, but the friction between filler particles prevents effective conforming to complex shapes
Solution Approach 1:
The packaging system transitions from a static compressed state during handling to a dynamic expanded state during forming. The filler particles are held in a non-free-flowing state during transport but can flow freely when vacuum is applied, allowing the material to adapt its shape dynamically based on operational needs.
Solution Approach 2:
The physical state of the filler particles is changed by altering the pressure parameter. Under ambient pressure, particles are compressed and friction-dominated; under vacuum, particles expand and become free-flowing, enabling shape conformity without sacrificing handling rigidity in either state.
2Manufacturing precision
If vacuum is applied to expand the packaging material for forming, then the material can conform to complex shapes, but the filler particles become free-flowing and lose structural stability
Solution Approach 1:
The vacuum application is periodic rather than continuous - applied during forming operations to enable shape conformity, then removed to restore structural stability for handling. This periodic cycling between expanded and compressed states allows the material to achieve both shape fidelity and structural integrity at different times in the operational cycle.
3Ease of operation
If the packaging material is compressed to render filler materials non-free flowing for handling rigidity, then the packaging maintains its shape, but the friction between particles limits ability to package non-rigid items effectively
Solution Approach 1:
The harmful friction effect is extracted or removed temporarily by applying vacuum during forming operations. This eliminates the particle-to-particle friction that prevents conformity to complex shapes, while maintaining the compressed non-free-flowing state during handling when friction provides structural stability.
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 system allows for the formation of packaging materials that can closely match complex shapes, improving packaging efficiency for both rigid and non-rigid items and enabling reuse by reforming into different shapes.
Implementation Method 1
a vacuum system fluidly communicating with the forming chamber and operable to establish a vacuum within the forming chamber
Implementation Method 2
applying a vacuum to the forming chamber, thereby expanding the packaging material
Implementation Method 3
An actuator is operable to urge the packaging material and the forming die into engagement with one another
Implementation Method 4
urging the expanded packaging material and a forming die into engagement with one another, thereby forming the expanded packaging material into a shape at least partially corresponding to the forming die
Implementation Method 5
Returning the forming chamber to ambient pressure may compress the packaging material such that the packaging material maintains the shape at least partially corresponding to the forming die
Data Source
AI summary
A system for forming a vacuum bag packaging material into a desired shape includes subjecting the exterior of the packaging material to a vacuum to expand the packaging material. The expanded packaging material is then pressed into or against a forming device. Expanding the packaging material renders a filler material inside a sealed packaging membrane free flowing, such that the packaging material can assume the shape of the forming device during the pressing operation. When the vacuum is removed, the membrane recompresses upon the filler material and renders it non-free flowing such that the formed packaging material maintains the formed shape during ordinary handling.