Multilayer Sampling Bag Walls for Gas Stability
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Solution Overview
Problem
Conventional gas sampling methods face issues with contamination, sample loss, and limited stability due to the use of thin monolayer sample bags, which lead to inaccurate results and high maintenance costs, especially in environments requiring precise chemical analysis.
Innovation Solution
The development of sample bags with multilayer walls featuring an inner layer of low permeability and low adsorption materials, such as stainless steel or fluorinated polymers, combined with a thermoplastic sealing layer to minimize contamination and sample loss, while maintaining sample integrity through a hermetic seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If thin monolayer sample bags are used, then the device complexity is reduced and ease of manufacture is improved, but sample stability deteriorates due to contamination and sorption
Solution Approach 1:
The patent applies composite materials by constructing the sample bag wall as a multilayer structure comprising an inner layer and an outer layer. The inner layer is made of a material with low permeability and low sorption properties (such as fluorinated polymers or stainless steel), while the outer layer provides mechanical strength and chemical resistance. This composite structure resolves the contradiction by maintaining sample gas stability through the inner layer's barrier properties while the outer layer provides structural integrity, overcoming the limitations of thin monolayer bags.
Solution Approach 2:
The patent segments the sample bag wall into distinct functional layers: an inner layer specifically designed to prevent contamination and sorption of the sampled gas, and an outer layer designed for mechanical strength and chemical resistance. This segmentation allows each layer to be optimized for its specific function, resolving the contradiction between structural simplicity and sample stability by distributing different functions across separate layers.
2Ease of operation
If conventional sampling apparatuses are used, then ease of operation is maintained, but measurement precision deteriorates due to contamination and sample loss
Solution Approach 1:
The patent employs disposable sample bags with optimized multilayer structures that prevent contamination and sorption. These single-use bags eliminate the need for complex cleaning and maintenance procedures while ensuring measurement precision through their inherently stable barrier properties. The inner layer's low permeability and low sorption characteristics ensure accurate gas composition analysis without requiring elaborate cleaning protocols.
3Stability of the object's composition
If multilayer walls with inner layer of low permeability material are used, then sample stability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by carefully selecting the thickness and material composition of each layer to optimize both performance and manufacturability. The inner layer is made thin enough to maintain flexibility and ease of sealing, while the outer layer provides necessary mechanical strength. By optimizing these parameters, the patent achieves sample gas stability through the inner layer's barrier properties while keeping the overall structure manageable for standard manufacturing processes.
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
These sample bags provide improved stability and accuracy of gas samples by reducing off-gassing and sorption, allowing for longer sample retention and easier cleaning and reuse, thus reducing overall costs and maintenance.
Implementation Method 1
The inner layer may be made of a material with low permeability and low sorption properties, such as fluorinated polymers or stainless steel
Implementation Method 2
The inner layer may be made of a material with low permeability and low sorption properties
Implementation Method 3
The sample bag may be sealed by thermo-sealing, an adhesive, welding, or folding
Data Source
AI summary
Sample bags having at least one multilayer wall are described. The multilayer wall may include an inner layer and a sealing layer. The sealing layer is outside of the inner layer and forms a seam around at least a portion of the sample bag. In certain embodiments, the inner layer comprises a patterned periphery. The patterned periphery extends into the seam to provide the inner layer with a mechanical stability.The inner layer may be a thin metal foil or a plastic film and the sealing layer may include a sealing surface of a thermoplastic, wherein the thermoplastic of each sealing layer may be fused to form a seal around the periphery of the sampling bag. The sample bag thereby an inner layer with a low permeable, low adsorption layer coupled with a second layer providing an effective seal results in a sample bag with improved sample gas stability.