| 摘要 |
PURPOSE:To enable temp. indication at which a titled sheet set discolors irreversibly when exposed to a prescribed temp. or above for prescribed time or above by laminating a sheet contg. a component A which melts at a prescribed temp., a diaphragm which allows permeation of the molten component and a sheet contg. a material B which discolors when the material contacts with the component A in this order. CONSTITUTION:A component A prepd. by incorporating a coloring material 1 such as an electron donative colorable org. compd. or the like into a wax-like material 2 such as higher alcohol, hydrocarbon or the like which melts at a prescribed temp. is coated on a diaphragm 4 formed of paper, non-woven fabric, porous plastic film or the like which allows permeation of the material 2 together with the material 1 when said material melts and is dried. An adhesive agent 5 which allows permeation of the molten component A is coated on the opposite side of the film 4 if necessary. On the other hand, a sheet II formed by impregnating a discoloring material 3, for example, polyhydric phenol, org. carboxylic acid or the like, which discolors when said material contacts with the material 1 in the component A with paper, etc. is laminated to the sheet I on the film 4 side and an adhesive agent layer 6 to be adhered to an article to be measured of temp. is provided on the opposite side of the sheet II according to need. The easy detection of the temp. is thus made possible by the irreversible discoloration of the sheet when said sheet is held at the prescribed temp. or above for the prescribed time or above. |
