Mechanical and thermal properties of commercial multilayer flexible plastic packaging materials irradiated with electron beam

• Autorzy: Oliveira V. M. , Nogueira B. R. , Ortiz A. V. , Moura E. A. B.
• Konferencja: International Conference on Recent Developments and Applications of Nuclear Technologies (15-17.09 2008 ; Białowieża, Poland)
• Języki publikacji: EN

Abstrakty

EN

The effects of electron-beam irradiation on mechanical and thermal properties were studied for two commercial multilayer structures of flexible food packaging. Both the laminated poly(ethylene terephthalate) (PET)/ low-density polyethylene (LDPE) and the coextruded LDPE/polyamide(PA)/LDPE structures were irradiated up to 120 kGy using a 1.5 MeV electron beam accelerator, at room temperature in the presence of air. Mechanical properties showed significant changes (p < 0.05), specially in sealability that was severely affected. Changes in mechanical properties were discussed in relation to the eight day and the six month period after irradiation. In addition, the DSC analysis six months after treatment showed that the fusion enthalpy of the PET/LDPE structure components increase for the LDPE from 10 kGy and decrease for the PET up to 120 kGy (p < 0.05). On the other hand, the LDPE/PA6/ LDPE presented increase in the LDPE and PA up to 120 kGy, except for LDPE at 10 and 15 kGy and PA at 5 kGy doses (p < 0.05). The effects of irradiation were less severe for the LDPE/PA6/LDPE than for the PET/LDPE. The electron-beam irradiation did not show advantageous results that could be of interest for commercial applications for the film industry, but brings important information about the packaging behavior for food producers who may decide to use irradiation as a form of cold pasteurization of their packed products.

Słowa kluczowe

EN

electron-beam radiation; multilayer packaging materials; mechanical properties; thermal properties

• Wydawca: Institute of Nuclear Chemistry and Technology
• Czasopismo: Nukleonika
• Rocznik: 2008
• Tom: Vol. 53, suppl. 2
• Strony: 141--144
• Opis fizyczny: Bibliogr. 7 poz., rys.

Twórcy

autor

Oliveira V. M.

• Radiation Technology Center, Nuclear and Energy Research Institute (IPEN-CNEN/SP), 2242 Prof. Lineu Prestes Ave., 05508-000 São Paulo, SP, Brazil, Tel.: [phone], Fax: [phone]

autor

Nogueira B. R.

• Radiation Technology Center, Nuclear and Energy Research Institute (IPEN-CNEN/SP), 2242 Prof. Lineu Prestes Ave., 05508-000 São Paulo, SP, Brazil, Tel.: [phone], Fax: [phone]

autor

Ortiz A. V.

• Unipac Embalagens Ltda, Rua Arnaldo Magniccaro 521, 04691-060, São Paulo, SP, Brazil

autor

Moura E. A. B.

• Radiation Technology Center, Nuclear and Energy Research Institute (IPEN-CNEN/SP), 2242 Prof. Lineu Prestes Ave., 05508-000 São Paulo, SP, Brazil, Tel.: [phone], Fax: [phone]

Bibliografia

• 1. American Society for Testing and Materials (1996) Standard test methods for tensile properties of thin plastic sheeting. ASTM D 882-91
• 2. American Society for Testing and Materials (1994) Standard test method for slow rate penetration resistance of flexible barrier films and laminates. ASTM F 1306-90
• 3. American Society for Testing and Materials (2000) Standard test method for sealability resistance of flexible barrier films and laminates. ASTM F 88-00
• 4. Buchalla R, Schuttler C, Bogl KW (1993) Effect of ionizing radiation on plastic food packaging materials: a review. Part 1. Chemical and physical changes. J Food Prot 56:991–997
• 5. Goulas AE, Riganakos KA, Kontominas MG (2003)Effect of ionizing radiation on physicochemical and mechanical properties of commercial multilayer coextruded flexible plastics packaging materials. Radiat Phys Chem 68:865–872
• 6. Kim KB, Sung WM, Park HJ, Lee YH, Han SH (2004) Hydrophobic properties of ethylene-vinyl alcohol copolymer treated with plasma source ion implantation. J Appl Polym Sci 92;4:2069–2075
• 7. Riganakos KA, Koller WD, Ehlermann DAE, Bauer B, Kontominas MG (1999) Effects of ionizing radiation on properties of monolayer and multilayer flexible food packaging materials. Radiat Phys Chem 54;5:527–540