PROBLEM TO BE SOLVED: To suppress stably deterioration or decay of vegetables and fruits.SOLUTION: In a packaging bag for retaining freshness of vegetables and fruits constituted of a perforated synthetic resin film, a value of the rate of change of an aperture calculated from the area ratio R1(%) of the aperture at 40°C of the perforated synthetic resin film and the area ratio R2(%) of the aperture at 5°C of the perforated synthetic resin film according to the following formula (1) is 5 or higher and 50 or lower. Formula: rate of change of aperture={(R1-R2)/R2}×100 (1).COPYRIGHT: (C)2015,JPO&INPIT【課題】青果物の劣化または腐敗を安定的に抑制する。【解決手段】有孔合成樹脂フィルムから構成された青果物鮮度保持包装袋であって、前記有孔合成樹脂フィルムの40℃における開孔面積比率R1(%)と、前記有孔合成樹脂フィルムの5℃における開孔面積比率R2(%)と、から下記式(1)で算出される開孔変化率の値が、5以上50以下である、青果物鮮度保持包装袋。式:開孔変化率= {(R1-R2)/R2}×100 (1)【選択図】なし
