H2OO2CO2, etcPaper substrateBarrier coating layerPaper substrate + single-sided barrier coating = SHIELDPLUSLaminated by converterHeat seal layerFoods, etc.Source: Nippon Paper Industries websitebiomass level and biodegradability can be improved, and the paper mark can be printed on the paper.Environmentally friendly technology for metal cans attracting worldwide attentionMetal containers are used in bev-erages, food, and household. It has excellent barrier properties against liquids, gases, and light, high rigidity, and excellent moldability and work-ability. In terms of the environment, it is effective for material recycling, and the recycling rate of aluminum cans in FY2019 was 97.9%, of which 66.9% was horizontally recycled. RYOHIN KEIKAKU CO., LTD., a specialty retail-er that operates the MUJI brand with more than 700 stores in Japan and overseas, announced that it will begin switching from PET bottles to alumi-num cans for beverage containers in April 2021, which will “enable a switch to recyclable raw materials and also extend shelf life, thereby contributing reduces the total amount of waste, then Reuse, which reuses usable items, and finally Recycle, which uses unusable items as raw materials for re-produc-tion. Let’s stop the single-use, dispos-able habit,” he said.Currently, the environmental mea-sures that companies can take regard-ing packaging are: 1. Reduction of plas-tic (lighter, thinner, shorter, smaller), 2. Substitution of plastic with plant-de-rived plastic, biodegradable plastic, or paper, 3. Shift from multi-materials to mono-materials in consideration of re-cycling, 4. Separation of each material from multi-materials. However, “Vari-ous explorations are underway around the world, but the direction is not yet set,” says Sato.In order to encourage people to choose paper as a replacement mate-rial, it intends to promote the following (1) through (4).(1) Development of materials equiv-alent to plastic substitutes(2) Achievement of paper packag-ing materials(3) Development as an entry point, recycling and composting as an exit point(4) Building a paper-based “manu-facturing” infrastructureIn particular, the infrastructure in (4) requires converting technologies such as printing and processing suitable for paper, modification and development of filling and packaging machines suit-able for paper, and quality assurance and standards in accordance with the performance of paper, while also em-phasizing that “paper is suitable for a recycling-oriented business model that takes sustainability into consider-ation.”The majority of flexible packaging in the market consists of composite SHIELDPLUS, a water-based coating on paper that provides barrier functionalitymaterials made by laminating, coat-ing, or printing plastic films such as PP and PE with metal foil and other different materials. Because these are composite materials, recycling them is difficult. Flexible packaging outside Ja-pan tends to use mono-materialization and compostable materials, but in Ja-pan, paper is increasingly being used partially because the paper mark of an identification mark based on Act on the Promotion of Effective Utilization of Re-sources can be displayed by setting the weight ratio of paper to over 50% of the composite material.The company offers SHIELDPLUS, which provides barrier properties by applying a water-based coating to paper, and LAMINA, which gives pa-per heat-seal properties. In particular, SHIELDPLUS has an oxygen transmis-sion rate of 0.2-5.0 cc/m2·day·atm and a water vapor transmission rate of 80-120 g/m2·day. SHIELDPLUS/LDPE has the same oxygen transmission rate, but a water vapor transmission rate of 10-20 g/m2·day and can be used as a plastic substitute. As an example of packaging for snacks, OPP (20 µm thick)/aluminum evaporated PET (12 µm thick)/CPP (25 µm thick) can be re-placed with SHIELDPLUS and CPP (25 µm thick), the base material is reduced from two layers to one layer, the lam-ination process is reduced once, the Mr. Hiroyuki Ka-neda of Toyo Seikan Co., Ltd. introduced the environmental response of metal contain-ers.25
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