Faculty of Food Technology and Biotechnology, Department of Food Engineering, Laboratory for Food Packaging

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Main research field

Food packaging

Specific research areas

barrier characteristics of polymeric materials

Techniques/methods

manometric gas permeability testing of polymers; gas permeation, diffusion and solubility in polymers; kinetics of gas permeation in polymers; crease resistance of polymers

Equipment

Gas Permeability Tester (GDP-C); Flex durability tester; KFT; Modified atmosphere food packaging system

Technology keywords

  • Foil, fils
  • Laminate
  • Plastic bags
  • Food Packaging/Handling
  • Thermal material testing

Services offered

  • Teaching and Training

Market sectors

  • Commodity Chemicals
  • Specialty Chemicals
  • Beverages
  • Food Producers
  • Forestry & Paper
  • Industrial Metals & Mining

Short summary (English)

The main focus of Dr. Galić's research group is to understand the molecular mechanism of gas (oxygen, carbon dioxide, nitrogen etc.) transport through polymers used for food packaging. The studies are conducted in order to understand how the gas transport properties are affected by polymer characteristics (morphology, free volume, orientation, thermal processing history, degree of crystallization, defects, etc.). Gas transport is expected to be highly complicated by the presence of the crystalline domains, which add a tortuosity factor to the gas diffusion process. For that purpose gas transport properties (coefficient of permeation, diffusion and solubility) of polymeric films are examined as a function of the external factors (temperature, humidity, mechanical stress, physical aging). Results obtained from permeation experiments are correlate with physico-chemical characteristics of permeates. The group is currently running a projects (in cooperation with partners from other Faculties in Zagreb and Rijeka) on gas permeability characterisation of modified low density polyethylene (PE-LD) films by nanoparticles (zeolite and nanoclay) and commercially available linear low density polyethylene (PE-LLD) and polypropylene (PP) exposed to uniaxial mechanical deformation in order to simulate possible damage provoked by products transport and handling.

Short summary (Croatian)

Glavni fokus istraživačkog tima dr. Galić obuhvaća spoznaje o mehanizmu transporta plinova (kisik, ugljikov dioksid, dušik itd.) kroz polimerne materijale koji se koriste za pakiranje hrane. Pri tome se nastojati odrediti da li je transport plina u izravnoj korelaciji sa karakteristikama polimera (morfologijom, prisutnim slobodnim volumenom, orijentacijom, termičkom obradbom, stupnju kristalnosti, prisutnim oštećenjima, itd.). Pri tome se mehanizam transporta plina može značajno zakomplicirati udjelom kristalne faze unutar polimera, uz dodatno razmatranje faktora zavojitosti na proces difuzije plinova, kao i raspodjelom slobodnog volumena unutar matriksa polimera o kojem će ovisiti i gibljivost molekule plina. Stoga se provode istraživanja permeacijskih svojstva plinova (koeficijent permeacije, difuzije i topljivosti) kroz polimerni film u ovisnosti o vanjskim čimbenicima (temperatura, vlaga, mehaničko naprezanje, utjecaj starenja). Dobiveni parametri permeacije plinova koreliraju se sa fizikalno-kemijskim svojstva permeata. Istraživački tim trenutno radi na projektima (u suradnji sa partnerima sa drugih fakulteta u Zagrebu i Rijeci) na karakterizaciji barijernih svojstava modificiranog polietilena niske gustoće (PE-LD) sa nanočesticama (zeolit i glina) i komercijalnim polimernim materijalima, linearni polietilen niske gustoće (PE-LLD) i polipropilen (PP), izloženim uniaksijalnoj mehaničkoj deformaciji u cilju simulacije mogućih oštećenja tijekom transporta i rukovanja sa materijalom.

Last update: 06.02.2013. 06:08:20

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