PROBLEM TO BE SOLVED: To provide a foamed sheet for retaining freshness of foods which is capable of further retaining freshness than a conventional general packaging material when packaging perishable foods.SOLUTION: A foamed sheet for retaining freshness of foods comprises a polyethylene foamed sheet 1 of 1.0-5.0 mm in thickness and 20-50 times in expansion ratio, a polyethylene sealant (a polyethylene layer 3), and a polypropylene film of 20-40 μm and having a surface in contact with foods in which inorganic salt and glycerin fatty acid ester are blended, or a biaxially oriented polypropylene film 2 of 20-40 μm in thickness that sodium ions and magnesium ions are dispersed, and the foamed sheet for retaining freshness of foods is formed by laminating the polyethylene layer consisting of the polyethylene sealant that sodium ions and magnesium ions are dispersed and having a thickness of 20-40 μm on the polyethylene foamed sheet 1.COPYRIGHT: (C)2014,JPO&INPIT【課題】生鮮食品を包装する際、従来の一般的包装材以上に鮮度を保持出来る食品鮮度保持用発泡シートを提供する。【解決手段】厚さ1.0~5.0mm、発泡倍率20~50倍のポリエチレン発泡シート1と、ポリエチレンシーラント(ポリエチレン層3)と、食品と接する面を無機塩とグリセリンの脂肪酸エステルを配合した20~40μmのポリプロピレンフィルム、或いは、ナトリウムイオンとマグネシウムイオンを分散させた厚さ20~40μmの2軸延伸ポリプロピレンフィルム2から成る食品鮮度保持用発泡シート、並びに、ポリエチレン発泡シート1上に、ナトリウムイオンとマグネシウムイオンを分散させたポリエチレンシーラントからなる厚さ20~40μmのポリエチレン層をラミネートしてなる食品鮮度保持用発泡シート。【選択図】図1
