Academic Journal
Evaluation of the Thickness and Oxygen Transmission Rate before and after Thermoforming Mono- and Multi-layer Sheets into Trays with Variable Depth
| العنوان: | Evaluation of the Thickness and Oxygen Transmission Rate before and after Thermoforming Mono- and Multi-layer Sheets into Trays with Variable Depth |
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| المؤلفون: | BUNTINX, Mieke, WILLEMS, Gert, KNOCKAERT, Griet, Adons, Dimitri, YPERMAN, Jan, CARLEER, Robert, PEETERS, Roos |
| سنة النشر: | 2014 |
| المجموعة: | Document Server@UHasselt (Universiteit Hasselt) |
| مصطلحات موضوعية: | thermoforming, oxygen transmission rate, gas barrier, EVOH, semi-rigid food packaging, flexible food packaging film |
| الوصف: | During thermoforming, plastic sheets are heated and subsequently deformed through the application of mechanical stretching and/or pressure. This process directly impacts sheet properties such as material thickness in walls, corners, and bottom, crystallinity in the constituent layers, and particularly the oxygen gas permeability. The aim of this study was to quantify the impact of thermoforming on thickness and oxygen transmission rate (OTR) of selected packaging materials (polypropylene (PP); PP/ethylene-vinyl alcohol co-polymer/PP (PP/EVOH/PP); polystyrene/EVOH/polyethylene (PS/EVOH/PE); amorphous polyethylene terephtalate/PE (APET/PE); APET/PE/EVOH/PE; polyamide/PE (PA/PE); and (PE/)PA/EVOH/PA/PE). These materials were extruded in two different thicknesses and thermoformed into trays with the same top dimensions and variable depths of 25, 50, and/or 75 mm and a 50 mm tray with a variable radius of the corners. The distribution of the material thickness in the trays was visualized, showing the locations that were most affected by the deep drawn process. The OTR results indicate that the calculated OTR, based on a homogeneous material distribution, can be used as a rough approximation of the measured OTR. However, detailed analysis of crystallization and unequal thinning, which is also related to the tray design, remains necessary to explain the deviation of the measured OTR as compared to the predicted one. ; The MaProDe_Ox project “Impact of Material, Process & Design on the Oxygen Permeability of Thermoformed Packaging” was supported by grants from Flanders’ Food (FF). |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 2073-4360 |
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[Google Scholar] - See more at: http://www.mdpi.com/2073-4360/6/12/3019/htm#sthash.Oe1d8kxA.dpuf; Polymers, 6 (12), p. 3019-3043; http://hdl.handle.net/1942/18066; 3043; 12; 3019; 000346795700009; http://www.mdpi.com/2073-4360/6/12/3019 |
| DOI: | 10.3390/polym6123019 |
| الاتاحة: | http://hdl.handle.net/1942/18066 https://doi.org/10.3390/polym6123019 http://www.mdpi.com/2073-4360/6/12/3019 |
| Rights: | © 2014 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/). - See more at: http://www.mdpi.com/2073-4360/6/12/3019/htm#sthash.Oe1d8kxA.dpuf ; info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.4619C925 |
| قاعدة البيانات: | BASE |
Full Text Finder | تدمد: | 20734360 |
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| DOI: | 10.3390/polym6123019 |