Sample Tube Barcode Skirt to Reduce Frost Obstruction
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Solution Overview
Problem
The formation of ice crystals on the barcodes of sample tubes due to condensation when transported from cold environments to ambient temperatures obscures the 2D barcode, making it difficult for optical scanners to read accurately.
Innovation Solution
A sample tube design with a skirt or high thermal conductivity material extending from the bottom to enclose a volume of air below the barcode, freezing moisture and blocking convective airflow to reduce icing, or a rack with high conductivity material forming an air pocket below the barcode to achieve the same effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sample tubes are transported from cold storage to ambient temperature, then the samples remain stable and viable, but condensation forms on the tube bottom obscuring the barcode
Solution Approach 1:
A high thermal conductivity material (such as metal) is introduced as an intermediary element between the cold sample tube bottom and the ambient air. This intermediary rapidly conducts heat to the condensed moisture, freezing it and preventing ice formation on the barcode, while allowing the sample to remain at cold temperatures for stability.
Solution Approach 2:
The thermal conductivity parameter of the material at the tube bottom is significantly increased by using high thermal conductivity materials (k > 14 W/mK, preferably k > 100 W/mK). This parameter change enables rapid heat transfer to frozen the condensed moisture, preventing ice obscuration of the barcode while maintaining sample cold temperature.
2Object-affected harmful factors
If a wall of high thermal conductivity material is added to enclose air below the barcode, then ice formation is reduced, but device complexity increases
Solution Approach 1:
The tube structure is segmented into distinct functional zones: the main tube body for sample containment, and a separate high thermal conductivity wall or skirt element extending below the barcode. This segmentation allows the anti-icing function to be added as a distinct component rather than complicating the entire tube structure.
Solution Approach 2:
The anti-icing solution extends into a new spatial dimension by adding a vertical wall or skirt element that protrudes below the barcode plane. This dimensional extension creates a protective air pocket and thermal conduction path without interfering with the horizontal barcode reading area, thus reducing ice formation while maintaining structural simplicity.
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 effectively reduces ice formation on the barcode, maintaining its readability by creating a dry microclimate, with significant improvements seen with materials having thermal conductivities greater than 100 W/mK.
Implementation Method 1
The wall freezes moisture from the volume of air
Implementation Method 2
blocks convective flow across the bottom exterior
Data Source
AI summary
The 2D barcode at the base of a sample tube is protected from frosting by an air pocket within a wall of high thermal conductivity material that surrounds the barcode. The wall is of thermal conductivity greater than 14W/m K and preferably greater than 200W/m K. The wall may be formed as a skirt extending from the base of the sample tube or as a part of a supporting rack. The wall, cooled by the sample tube and the frozen sample within the tube, collects frost that would otherwise collect on the 2D barcode and deflects the flow of moist air that would otherwise flow against the barcode.