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Extrusion coating experiments of flame retarded low density polyethylene (LDPE) onto a standard machine finished Kraft paper have been carried out. A pilot extrusion coating line was used in order to investigate the potential of halogen-free flame retardant system based on azoalkanes such as azocyclohexane (AZO) and 4′,4-bis(cyclohexylazocyclohexyl)methane (BISAZO) for fire resistant coating applications. In comparison, experiments were performed using FlameStab ® NOR116, magnesium dihydroxide (MDH) and a brominated additive Luvogard MB81/PE as reference flame retardants. The concentration of azoalkane flame retardants was varied between 0.5 and 1 wt.%. The maximum extrusion temperature was varied between 260 and 290 °C and the coating layer weight from 12.9 to 25.0 g/m 2 . The obtained multilayer facings containing azoalkanes exhibited significantly improved flame retardant properties, especially at the low coating weight of 12.9 g/m 2 . Under all of the used experimental conditions the runnability on the pilot line was flawless for azoalkane formulations. In contrast, our pre-trials using MDH/LDPE (50:50) formulations failed due to poor film quality and visible white aggregates. Moreover, the multilayer facings containing the FlameStab ® NOR116, Luvogard MB81/PE or mixtures thereof, showed inferior flame retardant properties compared to azoalkane based facings. [ABSTRACT FROM AUTHOR]

The study aims to establish if the packages based on paper or LDPE modified with extract of thyme and garlic are efficient in preserving the summer salame during storage, as compared with the unmodified packages. Eight different types of packages based on paper or LDPE impregnated in the aqueous extracts of thyme and garlic were prepared and used to test their preservation activity during the storage of the summer salame, a Romanian meat product, at room temperature and light. The eight types of packages are as follows: product impregnated in extract of thyme (IP thyme) and garlic (IP garlic), summer salame packaged in unmodified paper (H) and LDPE (LDPE), summer salame packaged in paper impregnated in extract of thyme (IH thyme) and in extract of garlic (IH garlic), summer salame packaged in LDPE impregnated in extract of thyme (ILDPE thyme) and in extract of garlic (ILDPE garlic). At 0, 3 and 6 days, the following physico-chemical parameters were monitored during storage: acidity, pH, water, salt and protein content. Additionally, the changes of the organoleptic characteristics were established. It was observed that the most reduced decrease of the acidity and protein content during storage occured in the summer salame impregnated in the thyme extract and in the salame packaged in the paper impregnated in the garlic extract. Moreover, the organoleptic characteristics of the samples impregnated in the thyme and garlic extract, excepting those in packages based on LDPE were not significantly changed during storage, at room temperature and under light. [ABSTRACT FROM AUTHOR]

• Hydropulping and selective dissolution/precipitation separate Tetrapak® constituents. • Effective separation of paper, AL and LDPE is achieved. • LDPE from inner layers exhibits properties comparable to virgin LDPE grades. Tetra Pak cartons, i.e. multilayer packaging consisting of paper, low density polyethylene (LDPE) and aluminium, are widely used as aseptic packages in the food and beverage industry. Paper can be easily recovered from this type of post-consumer beverage cartons (PCBCs) by the pulp industry. The remaining LDPE/aluminium by-product, however, cannot be easily separated to its constituents so currently it is mostly downcycled or used for energy recovery. The aim of this work is to develop an effective process that separates and recovers LDPE and aluminium of high purity and good quality from Tetra Pak cartons. To this purpose, following paper recovery by hydropulping, LDPE and aluminium are separated using a selective dissolution-precipitation (SDP) process. The recovered LDPE is characterized by FTIR spectroscopy, thermogravimetric analysis (TGA), differential scanning (DSC) and melt flow rate (MFR) measurements. The findings reveal that the SDP separation process is an effective method to recover LDPE and aluminium from PCBCs. [ABSTRACT FROM AUTHOR]