Abstract
Radiation effect on the PA/PE/Eva film material with a thickness of 55 μm was investigated at theBurnazyanCenterusing radiation processing plant (RPP) with the UELR‑10–10–40 accelerator at 10 MeV. Polymer films were irradiated with doses of 0 to 18 kGy. The study of IR spectra showed that when processing the PA/PE/Eva film with fast electrons with a dose of up to 18 kGy using the UELR10–10–40 plant with a power of 10 MeV the number of functional -CH3 and -NHgroups in the IR spectra changes to 0.0060 relative units with radiation doses of 12 to 18 kGy, which leads to degradation of the sample and its crosslinking simultaneously. Using confocal laser microscopy, it was demonstrated that after irradiation of PA/PE/Eva sample with doses of 18 kGy, the surface of the film becomes smooth in РА layer and in Eva layer, and a spot thinning of the sample occurs. These characteristics may cause a change in the barrier properties of the film material and affect the shelf life of food in a packaging.
Highlights
Radiation technologies in food industry are used to achieve maximum sterilization effect with low operating costs, while ensuring accurate dosing of radiation, high degree of efficiency and productivity
PA/PE/ethylene vinyl acetate (Eva) samples were treated with fast electrons on the UELR‐10–10–40 plant at 10 MeV with doses of 3 to 18 kGy
The work shows that the PA/PE/Eva sample is uniformly treated with fast electrons
Summary
Radiation technologies in food industry are used to achieve maximum sterilization effect with low operating costs, while ensuring accurate dosing of radiation, high degree of efficiency and productivity. To maintain sterilization effect and increase shelf life of food products, radiation sterilization is often carried out in packages [1,2,3]. The most common packaging materials have 2 to 5 layers. Combining several layers of different polymers, manufacturer may create film materials with desired properties for each type of agricultural products, taking into account breathing processes. Adhesives are often used to increase film barrier properties and strength. Permeability properties of packaging materials with Eva (ethylene-vinyl acetate) and EVON (ethylene/vinyl alcohol copolymer) adhesives are close to those of films with aluminum layer. One of the ways to increase the shelf life is to create conditions that exclude oxidation and wetting of products leading to the growth of microorganisms [5]
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