| 摘要 |
<p>Provided is a thermal indicator in which it is possible to prevent a solid coloring holt-melt substance from infiltrating an absorbing body, and the coloring melt of the coloring hot-melt substance can be reliably absorbed by the absorbing body. This invention comprises: an ampoule bottle (12) in which there is sealed a coloring heat-sensitive material that melts and becomes the coloring melt at a predetermined temperature; a cylindrical body (14) obtained by rolling a composite membrane (15), obtained by bonding an absorbent membrane (15b) that absorbs the coloring melt to one surface side of an impermeable membrane (15a) that is impermeable to the coloring melt, so that the impermeable membrane (15a) is located on the inside; and a tube (16) in which there is sealed the ampoule bottle (12) inserted in a space (14a) surrounded by the impermeable membrane (15a) of the cylindrical body (14), the tube being such that the color of the absorbent membrane (15b) is visible from the outside. At a temperature equal to or less than the melting temperature of the coloring heat-sensitive material: at least a part of the ampoule bottle (12) is destroyed; the coloring melt resulting from melting of the solid coloring heat-sensitive material, at least a part of which is discharge or is in a state of being capable of discharged, into the space surrounded by the impermeable membrane (15a), is absorbed from the absorbent membrane (15b) at an end surface of the cylindrical body (14); and a colored portion (20) is formed in the absorbent membrane (15b).</p> |
