PROBLEM TO BE SOLVED: To provide a disposable body warmer having a short rise time when used, and warming up soon in a short time.SOLUTION: This disposable body warmer includes a bag body constituent member including: a nonwoven fabric having weight per unit area &ge10 g/m2 and <30 g/m2, and the following variation of minute weight per unit area &ge8% and a porus film. A ratio (a percentage: %) [(3&sigma/AVE)×100] of a value obtained by collecting 6-12 square measuring samples each having a length of 25 mm and a width of 25 mm from the nonwoven fabric, measuring the weight per unit area, calculating an average value (AVE) and standard deviation (&sigma) of the weight per unit area, and trebling the standard deviation to the average value is set as the dispersion of the minute weight per unit area.COPYRIGHT: (C)2012,JPO&INPIT【課題】使用時に、立ち上がり時間が短く、短時間で早く温まる使い捨てカイロを提供する。【解決手段】本発明の使い捨てカイロは、目付けが10g/m2以上30g/m2未満かつ下記の微小目付けのバラツキが8%以上である不織布と多孔質フィルムとを含む袋体構成部材を有することを特徴としている。なお、不織布から、長さ25mm、幅25mmの正方形状の測定用サンプルを6~12個採取、目付けを測定し、目付けの標準偏差(σ)と平均値(AVE)を算出し、平均値に対する標準偏差を3倍した値の割合(百分率:%)[(3σ/AVE)×100]を上記の微小目付けのバラツキとする。【選択図】図1
