Source: Kirin Holdings websiteKirin NAMACHA Green Ecology BottleKirin Beverage has positioned Kirin NAMACHA as its flagship environmen-tal brand and introduced the cylindrical PET “Green Bottle” in 2016, followed by the square cylindrical “Green Ecol-ogy Bottle” in April 2022.Compared to conventional cylindri-cal bottles, the Green Ecology Bottle reduces environmental impact in the following four ways.1. The square-cylindrical shape im-proves loading efficiency by reducing voids in corrugated cardboard, there-by reducing the amount of corrugated cardboard used.2. The use of roll labels reduces the amount of plastic used by reducing the amount of excess labels.3. Reduced use of corrugated by reducing the dimensions of PET bot-Kirin Holdings / Kirin BeverageTatsunori Okubo of Kirin Holdings ex-plained the development background and details of the Kirin NAMACHA Green Ecology Bottle.tles by using a rectangular cylindrical shape. This has resulted in a reduction of up to 12.7%.4. Shortened the length of the inte-grated packaging for label-less prod-ucts, making them easier to identify as label-less. In addition, the use of square cylindrical bottles has increased the number of cases loaded on a pallet from 48 to 60, improving efficiency by up to 25% and contributing to more efficient logistics. The improvement in the number of cases loaded will help to compress storage space and address driver shortages during transportation.For example, films and bottles con-taining EVOH laminated with polyeth-ylene and maleic anhydride polyeth-ylene (PE-g-MAH) are widely used to prevent degradation of the contents of food and chemical products. However, laminates containing EVOH can cause problems such as increased viscosity and yellowing during material recy-cling. In addition, while five-layer or higher molding machines are used to produce laminates containing EVOH, it is desirable to achieve both gas barrier properties and adhesion in a three-lay-er molding machine.In the study, a new sEVA product TosohDaisuke Kawato of Tosoh’s Polymer Research Laboratory presented re-search on the performance evaluation and recyclability of three-layer struc-tures containing saponified EVA (sEVA) and EVOH, which have structures simi-lar to ethylene-vinyl alcohol copolymer (EVOH), which has excellent gas barri-er properties.(sEVA1), conventional sEVA (sEVA2), PE-g-MAH, and two types of EVOH were used to test a three-layer (PE/PE-g-MAH/PE) and a five-layer (PE/PE-g-MAH/EVOH/PE-g-MAH/PE) laminate.In experiments comparing adhesion strength and oxygen permeability be-fore and after bending, the performance was evaluated in a 3-layer film consist-ing of PE/(sEVA+EVOH1)/PE (thickness: 20/10/20 μm) and a 5-layer film con-sisting of PE/PE-g-MAH/EVOH2/PE-g-MAH/PE (thickness: 15/5/10/5/15 μm). In the three-layer structure with sEVA1, the oxygen permeability decreased with increasing amount of EVOH, and the gas barrier property was greatly im-proved while maintaining high adhesion of more than 12 N/15 mm for the film with 30% EVOH.To evaluate the recyclability, sam-ples were prepared by melting and kneading the three-layer and five-lay-er components in a biaxial extruder. Compared to the PE + EVOH prepared for the control experiment, sEVA and PE-g-MAH showed significant im-provements in haze and mechanical properties and were found to act as phase solvents. Furthermore, it was observed that the sEVA blend showed a small change in MFR while the PE-g-MAH blend showed a significant de-crease in MFR. sEVA1 blend showed particularly good transparency and elongation at break in the TD direction after recycling. sEVA2 blend showed a significant improvement in MFR while the PE-g-MAH blend showed a signifi-cant decrease in MFR.This study confirms that the new sEVA1 is compatible with EVOH and exhibits excellent gas barrier proper-ties while maintaining high adhesion when EVOH is blended with PE. It also showed that gas barrier laminates can Kirin NAMACHA label-less 6-pack6Packaging materials: barriers, films, etc.Recyclable EVOH adhesion modifierOther: Containers, resource conservation, logistics
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