Polymer Film Water Vapor Permeability Control
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Solution Overview
Problem
Current packaging materials for culture media in in vitro diagnostics face challenges in maintaining optimal humidity levels, leading to premature drying or excessive condensation, and existing solutions either allow too much water vapor permeability or require additional desiccants, resulting in variable shelf life and increased costs.
Innovation Solution
A polymer film with controlled water vapor permeability, comprising a layer of polystyrene and a heat-sealing layer, which is non-stretchable and microperforated to maintain humidity levels, ensuring consistent agar stability and extended shelf life while being cost-effective and aesthetically pleasing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If high water vapor permeability materials are used for bagging culture media, then the packaging allows water vapor transmission, but the culture medium dries out prematurely
Solution Approach 1:
The patent applies parameter changes by precisely controlling the water vapor permeability parameter of the polymer film to fall within the range of 50-150 g/m²/24h at 38°C and 90% RH. This optimized parameter range resolves the contradiction by allowing sufficient water vapor transmission to prevent condensation while limiting excessive transmission that would cause drying out, thereby stabilizing shelf life across varying storage conditions.
Solution Approach 2:
The patent employs composite materials by using a polymer film with specific composition and structure that achieves the desired water vapor permeability characteristics. The composite nature of the film material allows it to balance water vapor transmission and barrier properties, resolving the contradiction between allowing some vapor transmission and preventing excessive moisture loss.
2Object-generated harmful factors
If low water vapor permeability materials are used for bagging culture media, then condensation is reduced, but the culture medium becomes too dry
Solution Approach 1:
The patent resolves this contradiction by optimizing the water vapor permeability parameter within the specific range of 50-150 g/m²/24h. This parameter optimization allows the film to transmit enough water vapor to prevent the culture medium from becoming too dry, while simultaneously limiting excessive transmission that would lead to condensation, thus balancing both harmful factors.
3Adaptability or versatility
If variable shelf life conditions are considered, then packaging must adapt to different storage temperatures, but standard packaging shows high variation in performance
Solution Approach 1:
The patent addresses this contradiction by selecting a water vapor permeability parameter range (50-150 g/m²/24h) that remains effective across varying storage temperatures. This parameter optimization ensures the packaging adapts to different storage conditions while maintaining consistent shelf life performance, reducing the variation that plagues standard packaging materials.
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 film effectively reduces agar weight loss kinetics, maintains stable humidity, and extends the shelf life of culture media under various temperature conditions, reducing manufacturing costs and ensuring consistent product quality.
Implementation Method 1
a first layer of a polymer material, in particular polystyrene... with controlled water vapor permeability
Implementation Method 2
at least one heat-sealing layer... capable of being heat-sealed
Data Source
Figure 1
AI summary
The invention relates to the use of a polymer film for packaging at least one microorganism culture medium, said film comprising at least one polystyrene layer and at least one heat-sealing layer and having an average water vapour permeability of between 30.0 g/m²x24 hours and 140.0 g/m²x24 hours, preferably between 70.0 g/m²x24 hours and 120.0 g/m²x24 hours.