![]() They observed that separation of PE in hexane yielded more effective results than using tetrahydrofuran with similar condition with ethyl acetate and ethanol, although they had similar boiling points. (2015), observed that xylene performs the best and yields the best performance to dissolve PE. After waiting 5 min at 100 rpm mixing speed at 60 ☌, they observed that the PE and Al layers were separated. (2014) used 30% benzene, 20% ethanol, and 50% water separation solution for Al-PE composites. They then increased the required reaction time (30, 60 and 120 min) until the temperature was reached. They performed the reaction at 11.65 MPa. The sample and anhydrous ethanol were heated in the reactor up to 225 ☌, which is the reaction temperature. (2013), conducted studies regarding the recycling of Al and polyethylene terephthalate (PET) from multilayer food packaging, using supercritical ethanol. Currently, PE–Al composites are used as an alternative energy source by pyrolysis (Korkmaz et al., 2009 Haydary et al., 2013 Solak and Rutkowski, 2013) or they are reprocessed to plastics for secondary uses (Lopes and Felisberti, 2006 Hidalgo, 2011), or they are incinerated (Varžınskas et al., 2012).įávaro et al. An outstanding characteristic of PE–Al composites derived from post-consumer aseptic packaging is that both plastic and metal components have firmly adhered and they are hard to separate by mechanical processes (Zhang et al., 2009 Fatoki et al., 2015 Cervantes-Reyes et al., 2015). PE and Al composites, is still a challenge today. While the recovered cellulose obtained as a result of hydropulping from tetra pak waste cartons is re-used in the paper industry, the separation of residual solid wastes, i.e. In this process, all tetra pak is used without leaving any waste (Ayrilmis et al., 2008 Zawadiak et al., 2017). The simplest recycling method of tetra pak wastes, which can not be separated into their components without any treatment, is to produce chipboard by processing together with its components (Enc et al., 2012). PE, used in 20%, has many functions: protects the paper layer from contact with water, protects aluminum layer from direct contact with packaging content bonds layers together and enables heat-sealing (Zawadiak et al., 2017). Al foil (5%) is used because of its excellent barrier properties for agents such as light, oxygen, water vapor, and microorganisms. Paper, responsible for 75% of packaging mass, is used to help ensure the rigid shape of the final product as well as to increase material strength. ![]() However, in general, the paper content represents 75% of the total weight of the package, 20% is from PE and the remaining 5% is from a thin layer of Al (Abreu, 2002). The type of paper used in composite beverage cartons depends on the packaged product, the region to be sold and the manufacturing conditions. ![]() Mainly used for the packaging dairy products, fruit juices, ice cream, cheese, food, vegetables, and pet food. It was determined that the use of 1 M acetic acid solution reduced the waiting time by 47% compared to the water use and that the use of 5 M acetic acid solution decreased the waiting time by 80% compared to the water use.Ĭomposite packages are preferred because they are durable, they are flexible, they are cheaper than metal packages, they allow long-term storage, they are suitable for various caps, and they can protect the freshness of pasteurized products. However, it was observed that, when used hydropulping, the papers were quickly recovered also, the rest of the Al was recovered, and when the acetic acid solution was used, the paper pulping time was shortened. It was observed that, when worked at the boiling points of trichloroethylene, xylene, and toluene, the dissolution happens 4 min earlier, and the temperature plays a vital role in the separation process. There has been more study that happened with solvents used, with using temperatures below the boiling point, but no superior efficiency was achieved. The best yield in PE dissolution was achieved using trichloroethylene, xylene, benzene, toluene, trichloroethylene: water (50:50, v/v), trichloroethylene: water (30:70, v/v) and benzene: trichloroethylene (50:50, v/v). The dissolution of PE in the solvent was investigated, and then the paper in the Al and paper mixture was removed by hydropulping. In the first studies, 13 different solvents were used. This work focuses on the separate recovery of the materials (paper, aluminum and polyethylene) in the composition of waste tetra pak cartons. In this study, we studied the composite packages known as tetra pak, which is mainly paper-carton, widely used in the world today, and has significant deficiencies in terms of recycling. ![]()
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