Inert Gas Pressurization for Hot-Filled Bottle Stability
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Solution Overview
Problem
Hot-filled bottles face challenges such as deformation, increased weight, and reduced design freedom due to internal vacuum, which existing solutions like vacuum panels, active bases, and cryogenic dosing fail to adequately address, resulting in limited weight savings and design constraints.
Innovation Solution
A method and system that involves rupturing sealed containers, flushing the headspace with an inert gas to remove oxygen, and then pressurizing it before re-sealing, using either a multiple needle approach or rapid cryogenic dosing to prevent vacuum-induced deformation and enhance bottle design flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If hot-filled bottles are provided with thicker side walls and special reinforcing structures to compensate for internal vacuum forces, then bottle deformation is prevented, but bottle weight and material cost increase
Solution Approach 1:
The patent applies preliminary action by introducing inert gas into the bottle headspace before sealing, creating positive pressure that counteracts the vacuum forces that will develop during cooling. This pre-pressurization prevents the need for thicker walls while maintaining shape stability throughout the cooling process
Solution Approach 2:
The patent changes the pressure parameter in the bottle headspace from negative (vacuum) to positive by introducing inert gas. This parameter change fundamentally alters how the bottle responds to cooling forces, allowing thin-walled designs to maintain structural integrity without requiring additional material
2Weight of moving object
If bottle sidewall thickness is reduced for light-weighting, then material cost and weight decrease, but O2 permeation rate increases accelerating product spoilage
Solution Approach 1:
The patent creates an inert atmosphere in the bottle headspace by introducing inert gas (such as nitrogen or carbon dioxide) that displaces oxygen. This inert environment prevents oxidative spoilage of the product, allowing the use of thinner sidewalls that would otherwise permit excessive oxygen permeation while maintaining extended shelf life
3Stability of the object's composition
If vacuum panels are used to compensate for vacuum by moving toward the center of the bottle, then bottle deformation is prevented, but design freedom is constrained and label placement is affected
Solution Approach 1:
Instead of using reactive vacuum panels that move in response to vacuum forces, the patent applies preliminary action by pre-pressurizing the headspace with inert gas before sealing. This eliminates the need for moving panels entirely, preserving complete design freedom and unrestricted label placement while maintaining shape stability
4Stress or pressure
If liquid N2 is dosed into the bottle to pressurize it after sealing, then vacuum compensation is achieved, but bottle deformation occurs due to pressure variation and petaloid base is required
Solution Approach 1:
The patent carefully controls the pressure parameter by introducing inert gas to achieve moderate positive pressure (1-5 psi) that counteracts vacuum forces without creating excessive pressure. This controlled parameter change prevents bottle deformation and eliminates the need for specialized pressure-resistant bases, unlike liquid N2 dosing which creates large pressure variations
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
This approach significantly reduces bottle weight, prevents deformation, and allows for more design freedom while extending shelf life and providing tamper evidence, all while maintaining top load resistance and vending performance.
Implementation Method 1
providing an inert gas within the headspace while allowing O2 to exit from the headspace until substantially all of the O2 has been flushed out of the headspace
Implementation Method 2
pressurizing the headspace by continuing to direct the inert gas into the headspace after it has been flushed
Implementation Method 3
the liquid N2 immediately transforms its state from a cryogenic liquid into a rapidly expanding nitrogen gas thereby pressurizing or charging the bottle
Data Source
AI summary
A method and system of transferring matter through a sealed container during a bottling process are provided. The method includes accessing a headspace of the filled and sealed container by creating at least one opening. An inert gas is provided within the headspace while allowing O2 to exit from the headspace until substantially all of the O2 has been flushed out of the headspace. The headspace is then pressurized by continuing to direct the inert gas into the headspace after it has been flushed of O2. The at least one opening of the container is then sealed while the headspace is under pressure. The filled and sealed container can be a hot-filled container.