PROBLEM TO BE SOLVED: To provide a bag-body constituting member which can provide a body warmer in which a low temperature burn is less likely to occur.SOLUTION: Provided is a bag-body constituting member in which each of two ventilative layers 12a, 12b includes at least a lamination layer construction that is adjacent to each other through or not through an adhesion layer 13 and ventilation performance in the thickness direction varies depending on the pressure applied in the thickness direction. Because ventilation performance of a bag-body formed by using the bag-body constituting member can be varied, in a body warmer formed by using the bag-body constituting member, a low-temperature burn is less likely to occur even in a case that a person sleeps with attaching it to the body.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】低温やけどが起こりにくいカイロを提供し得る袋体構成部材を提供する。【解決手段】2層の通気性を有する層12a、12b同士が、接着剤層13を介して又は介さずに隣り合う積層構成を少なくとも有し、厚み方向にかかる圧力によって厚み方向の通気性が変化することを特徴とする袋体構成部材であって、袋体構成部材を用いて形成された袋体の通気性を変化させることができるため、袋体構成部材を用いて形成されたカイロは、身につけた状態で就寝等した場合であっても、低温やけどを生じにくくすることができる。【選択図】図1
