PROBLEM TO BE SOLVED: To provide a throwaway pocket body warmer which is excellent in powder leakage characteristic, heat sealability, sealing strength, and stiffness.SOLUTION: The throwaway pocket body warmer stores a heating composition heating in the presence of oxygen in a bag material. The bag material is composed of a compound sheet in which a laminated nonwoven fabric C in which a thermoplastic synthetic textile layer S as a first layer, an extrafine textile layer M obtained by a melt blowing method as a second layer, and a layer W containing a thermoplastic synthetic textile having a low melting point by 30°C or more lower than the melting point of the first layer component textile as a third layer are laminated and integrated by thermocompression and a thermoplastic film are pasted to the third layer of the laminated nonwoven fabric. The compound sheet having vents c provided in at least either of the obverse or reverse of the bag material is characterized by the basis weight of the laminated nonwoven fabric in the range of 10 to 70 g/m2, the friction strength of 3 grade or higher, the powder leak rate of 10% or lower, and the formation index of 200 or lower.COPYRIGHT: (C)2009,JPO&INPIT【課題】粉漏れ性、熱シール加工性、シール強度、剛性などに優れる使い捨てカイロを提供する。【解決手段】酸素の存在下で発熱する発熱組成物を袋材に収容した使い捨てカイロであって、袋材が、第1層の熱可塑性合成繊維層S、第2層のメルトブロー法で得られた極細繊維層M、第3層として第1層の構成繊維の融点より30℃以上低融点である熱可塑性合成繊維を含む層Wを、積層して熱圧着して一体化した積層不織布Cと、熱可塑性フィルムとを積層不織布の第3層面に貼り合わせた複合シートからなり、その袋材の表裏の少なくとも一方に通気孔cを設けた複合シートとし、該積層不織布の目付けが10~70g/m2 、摩擦強度が3級以上、粉漏れ率が10%以下、地合指数が200以下であることを特徴とする使い捨てカイロ。【選択図】図1
