Coated Polyamide Film for Agar Culture Media Packaging
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Solution Overview
Problem
Current packaging materials for agar culture media either allow excessive water vapor permeability leading to premature drying or low permeability causing condensation issues, neither of which meets the requirements for optimal shelf life and aesthetic standards in in vitro diagnostics.
Innovation Solution
A single-layer polyamide film coated with PVC or PVDC, with controlled water vapor permeability between 35g/m² and 110g/m², is used for packaging, allowing for a balance between humidity retention and aesthetic appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyamide film with high water vapor permeability is used, then the film allows excessive water vapor transmission leading to premature drying of the culture medium, but if a polyamide film with low water vapor permeability is used, then the film causes condensation issues and does not meet aesthetic standards
Solution Approach 1:
The patent applies parameter changes by precisely controlling the water vapor permeability of the polyamide film to fall within the specific range of 35-110 g/m². This is achieved by adjusting the film's physical and chemical parameters during manufacturing, including the polyamide molecular weight, crystallinity, and additive composition, to achieve the optimal balance that prevents both premature drying and condensation while extending shelf life
Solution Approach 2:
The patent employs composite materials by combining polyamide with specific additives and potentially multi-layer structures. The composite formulation includes polyamide base material combined with water vapor permeability control agents, plasticizers, and other additives that work synergistically to achieve the target permeability range while maintaining mechanical properties and aesthetic appearance
2Ease of manufacture
If a single-layer polyamide film is used, then the film structure is simple and cost-effective, but achieving the optimal water vapor permeability balance is difficult
Solution Approach 1:
The patent achieves precise water vapor permeability control in single-layer polyamide films by optimizing the physical and chemical parameters of the film itself. This includes controlling the polyamide molecular weight distribution, crystallinity level, thickness uniformity, and additive concentration during the extrusion or casting process, enabling accurate permeability adjustment without requiring complex multi-layer structures
Solution Approach 2:
The patent applies local quality by ensuring uniform distribution of permeability-enhancing additives throughout the polyamide matrix. The additive concentration, molecular weight distribution, and crystallinity are optimized locally within the film structure to achieve consistent water vapor permeability across the entire film surface, maintaining both simplicity and precision
3Reliability
If the film provides good water vapor barrier properties, then condensation is prevented, but water vapor transmission is insufficient leading to drying of the culture medium
Solution Approach 1:
The patent resolves this contradiction by precisely adjusting the water vapor permeability parameter to the optimal range of 35-110 g/m². This parameter optimization allows the film to provide sufficient water vapor transmission to prevent drying while maintaining enough barrier properties to prevent excessive condensation, achieving balanced humidity control through careful parameter selection and control
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 extends the shelf life of agar culture media by maintaining a controlled humidity environment while preventing excessive condensation, meeting both functional and aesthetic requirements.
Implementation Method 1
the film thus obtained has an excessively low water vapor permeability value
Implementation Method 2
water vapor permeability (>120g/m2)
Data Source
Figure 1
AI summary
The invention relates to a single-layer polymer film tube used for conditioning articles having an extended shelf life, said film including a cast polyamide sheet coated on one side with a heat-sealable coating containing polyvinyl chloride (PVC) and/or polyvinylidene chloride (PVDC) so that said film has an average permeability of between 35g/m2/24 hour et 110 g/m2/24 hour. The invention also relates to a method for producing said film. The invention further relates to a bag obtained from said film, said bag being particularly adapted for conditioning articles having an extended shelf life, in particular canned microorganism culture media.