Abstract: To provide a technology capable of producing a package material that contributes highly to an environment. Provided is a package material, including: a fibrous material that includes waste paper and/or pulp; a binder; sodium hydrogen carbonate; a surfactant; and a water-soluble softener, the binder including one or more selected from polysaccharides and proteins. A urea derivative having a chemical structural formula of R1, R2—N—CO—N—R3, R4 (R1 to R4: H or a saturated and/or unsaturated hydrocarbon group having 1 to 4 carbon atoms) can be used as the softener according to the present technology. Further, a water-soluble polyhydric alcohol having 3 to 15 carbon atoms can also be used as the softener used in the package material according to the present technology.

Abstract: There is provided a technology capable of controlling the occurrence of “migration” of a foam material to a contact object. The present technology provides a package material containing: a fibrous material that includes waste paper and/or pulp; a binder; sodium hydrogen carbonate; a surfactant; and a water-soluble softener, the water-soluble softener being a urea derivative having a chemical structural formula of R1,R2—N—CO—N—R3,R4 (R1 to R4 are each H or a saturated and/or unsaturated hydrocarbon group having 1 to 4 carbon atoms) and/or a water-soluble polyhydric alcohol having 3 to 15 carbon atoms, the number of carbon atoms and the number of hydroxyl (OH) groups in a molecular structure of the water-soluble polyhydric alcohol satisfying a relationship of the number of hydroxy groups<the number of carbon atoms.