Micro holes and leaks in packaging – measurement and modelling MICRO HOLES AND LEAKS
Frederic Debeaufort
version: production (0.331)
date: January 03, 2021
content: 27 slides
class: specialized>S4>U4.6>part1
title: Micro holes and leaks in packaging – measurement and modelling MICRO HOLES AND LEAKS
source: Unit_4.6_Microholes_and_leaks.pptx
hash: 8559470526397342ee6e9f6e967a7a94
contact: olivier.vitrac@agroparistech.frthis lecture
Fitness lecture - $2020/12/21$ (v0.33)
Specialized modules
4. Mass transfer in food packaging
4.6 Micro holes and leaks in packaging
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CONTENT
- [1/27] Slide 01/27
- [2/27] Unit 4.6
- [3/27] Gas transport through leaks
- [4/27] Dense materials
- [5/27] Sorption
- [6/27] Knudsen diffusion mechanism
- [7/27] Mass transfer through porous materials
- [8/27] Molecular mean free path (λ) example of oxygen
- [9/27] D: pore diameter
- [10/27] Mass transfer through micro-porous materials (≤100 nm)
- [11/27] Calculation of diffusivity and transfer rate through micro holes from - knudsen equation
- [12/27] 1
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CONTENT (Cont'ed)
- [13/27] Molar transfer rate of gas
- [14/27] After integration, the - knudsen molar flow through a pore of area a () is
- [15/27] Then, the gas flow () through the pore becomes
- [16/27] Internal volume = 750
- [17/27] A) based on law of diffusion and equation of the flux, convert the otr from the datasheet to the otr value in use conditions.
- [18/27] The otr given by the film maker, according the astm standard, has been measured at 0% rh and for an oxygen differential [...]
- [19/27] This corresponds to an increase of
- [20/27] C) calculation of amount of oxygen permeated through the sealing zone
- [21/27] A) based on law of - knudsen diffusion law and the equation of the flux, determine j in such conditions
- [22/27] The mean molecular velocity of o 2 is
- [23/27] That represents 0.0008% of the headspace = an increase of the oxygen concentration of 0.0008%
- [24/27] Leaks detectors
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CONTENT (Cont'ed)
- [25/27] I nternational o rganization for s tandardization (iso)
- [26/27] Slide 26/27
- [27/27] Slide 27/27
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slide 01/27
Unit 4.6
Gas transport through leaks
Dense materials
Sorption
Knudsen diffusion mechanism
Mass transfer through porous materials
Molecular mean free path (λ) example of oxygen
d: pore diameter
Mass transfer through micro-porous materials (≤100 nm)
Calculation of diffusivity and transfer rate through micro holes from - Knudsen equation
1
Molar transfer rate of gas
After integration, the - Knudsen molar flow through a pore of area A () is
Then, the gas flow () through the pore becomes
Internal volume = 750
A) Based on law of diffusion and equation of the flux, convert the OTR from the datasheet to the OTR value in use conditions.
The OTR given by the film maker, according the ASTM standard, has been measured at 0% RH and for an oxygen differential [...]
This corresponds to an increase of
C) Calculation of amount of oxygen permeated through the sealing zone
A) Based on law of - Knudsen diffusion law and the equation of the flux, determine J in such conditions
The mean molecular velocity of O 2 is
That represents 0.0008% of the headspace = an increase of the oxygen concentration of 0.0008%
Leaks detectors
I nternational O rganization for S tandardization (iso)
slide 26/27
slide 27/27
Thank you for your attention.
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5. FMECA applied to food packaging design
5.1 History and principles of FMEA-FMECA
Micro holes and leaks in packaging – measurement and modelling MICRO HOLES AND LEAKS Frederic Debeaufort version : production ( 0 . 331 ) date : January 03 , 2021 content : 27 slides class : specialized>S 4 >U 4 . 6 >part 1 title : Micro holes and leaks in packaging – measurement and modelling MICRO HOLES AND LEAKS source : Unit_ 4 . 6 _Microholes_and_leaks.pptx hash : 8559470526397342 ee 6 e 9 f 6 e 967 a 7 a 94 contact : olivier.vitrac@agroparistech.fr [16:13:34 - 03/01/2021]olivi@LX-Olivier2020> pptx2reveal_v2 with the following parameters: parameter value wwwroot : /home/olivi/Bulk/fitness2020/sandbox/www20201221 wwwrel : lectures/html/specialized/S4/U4.6 wwwlib : lectures/src pptxfolder : /home/olivi/Bulk/fitness2020/download20201123/fItNeSs _ sPeCiAlIzEd tRaInInG MoDuLeS/SeSsIoN 4 _ MaSs tRaNsFeR In fOoD PaCkAgInG/UnIt 4.6 mIcRo hOlEs aNd lEaKs iN PaCkAgInG pptx : Unit_4.6_Microholes_and_leaks.pptx imfolder : src_part1 imsourcefolder : impat : Slide*.jpg svgpat : Slide*.svg author : Frederic Debeaufort contact : olivier.vitrac@agroparistech.fr YAMLtitle : specialized>S4>U4.6>part1 title : Micro holes and leaks in packaging – measurement and modelling MICRO HOLES AND LEAKS vrsn : 0.331 mdfile : part1.md projectname : part1 theme : moon resize : 1200x900 initialscale : 0.8 maximumscale : 2 userscalable : yes headingshift : headingshiftnotes : ## fontsize : 0.7 hash : 8559470526397342ee6e9f6e967a7a94 maxtitle : 120 maxcontentslide : 12 favicon : ~/Bulk/fitness2019/template/favicon/favicon.ico mainindex : lectures/html/index.html dependencymain : index.html imformatpreferred : svg svgmaxsize : 1200 KB pdf : Unit_4.6_Microholes_and_leaks.pdf