Naslov
Effect of External Parameters on Barrier Characteristics of Polyethylene Film for Food Packaging,

Autori
Kurek, Mia ; Galić, Kata

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of Abstracts.Symposium on Food Packaging Scientific Developments supporting Safety and Quality, Associations: International Life Sciences Institute-ILSI Europe / - Prag, 2008, 187-187

Skup
Symposium on Food Packaging Scientific Developments supporting Safety and Quality

Mjesto i datum
Prag, Češka Republika, 19.11.2008. - 21.11.2008

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Barrier Characteristics; Polyethylene Film; Food Packaging

Sažetak
This work shows how the permeability of gases depends on the temperature conditions as well as on the penetrant size and nature. Gas (O2, N2, and CO2) permeability (using manometric method, GDP-C Brugger instrument) of polyethylene (PE, thickness 0.05mm) is determined at different temperatures (from 4 º C to 60 º C). The permeance of the PE film increased with temperature increase. This was especially noticed for oxygen permeability (5150 cm3m-2d-1bar-1 at 40 º C and 15000 cm3m-2d-1bar-1 at 60 º C). Gas solubility also increases with temperature increase. More condensable and vapours gases, as CO2, shows a decrease of solubility with a temperature increase. It is due to the nature of the gas and the heat of solution that changes above the critical temperature. At 40 º C carbon dioxide solubility is the highest (0.0646 mLcm-3bar-1) followed by nitrogen (0.0548 mLcm-3bar-1) and oxygen (0.0177 mLcm-3bar-1). Although the gas diffusivity is between 10-7 and 10-6 cm2 s-1 for all gases analyzed, there are some differences between gases. For example at the room temperature (20 º C), the highest value shows oxygen (3.66x10-6 cm2s-1) followed by nitrogen (1.73x10-6 cm2s-1) and carbon dioxide (1.34x10-6 cm2s-1). As the N2 is as molecule the smallest one, it would be expected to have the highest value, but because of it’ s rather sluggishness it follows the oxygen.

Izvorni jezik
Engleski

Znanstvena područja
Prehrambena tehnologija

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