Moisture absorbent material with indicator function, humidity indicator and packaging bag

Abstract

A moisture absorbent material (drying material) with an indicator function is provided without the use of cobalt chloride containing a heavy metal, low molecular organic substance and the like; and a humidity indicator permitting a state of humidity to be found in a simple manner is also provided. The moisture absorbent material with an indicator function (10) includes a resin layer (11) containing 5 to 80 wt % zeolite which is provided on at least one surface thereof with a printed layer including a character, shape, picture or the like, so that the printed layer may visibly appear due to the resin layer becoming transparent by moisture absorption. The humidity indicator (20) is formed by laminating a film (21) made of a zeolite-containing resin composition, a polyolefin film (22) having patterns (24) printed thereon that include characters, symbols, lines or the like, which are printed to have a difference in the print density, and an aluminum foil (26) through an adhesive, so that the patterns (24) may be made sequentially visible due to the film (21) made of the zeolite-containing resin composition becoming transparent by moisture absorption.

Dependencies are inferred from the claim text.