A water-absorbent sheet structure comprising a structure in which an absorbent layer containing a water-absorbent resin is sandwiched with a hydrophilic nonwoven fabric from an upper side and a lower side of the absorbent layer, characterized in that at least one side of a topside and an underside of the water-absorbent sheet structure is subjected to embossing, and that the water-absorbent sheet structure has the following properties: when a saline solution is allowed to be absorbed in an amount of 4 L per 1 m2 of the water-absorbent sheet structure (4 L/m2), the water-absorbent sheet structure satisfies both of the following relationships of (A) and (B): (A) an expansion thickness ratio, i.e. T2/T1, of 2 or more, and (B) an expansion embossing depth, i.e. (T2&minust2)/T2, of 0.7 or more, wherein T1 is a thickness (mm) of a water-absorbent sheet structure before absorption of the saline solution T2 is a thickness (mm) of a water-absorbent sheet structure after absorption of the saline solution and t2 is an embossing thickness (mm) in the water-absorbent sheet structure after absorption of the saline solution. The water-absorbent sheet structure of the present invention exhibits some effects that the water-absorbent sheep structure does not undergo deformation of the form before liquid absorption or after the absorption thereof, and is capable of sufficiently exhibiting absorbent properties such as excellent liquid permeability and small liquid leakage.本發明之吸水片材結構體之特徵在於:其係具有使含有吸水性樹脂而成之吸收層由親水性不織布自該吸收層之上方及下方夾持而成之構造者,該吸水片材結構體之上表面及下表面之至少1面經實施壓紋,且具有以下之特性[於使該吸水片材結構體每1 m2吸收4 L生理食鹽水(4 L/m2)時,滿足如下之關係(A)及(B)兩者(其中,T1為生理食鹽水吸收前之吸水片材結構體厚度(mm),T2為生理食鹽水吸收後之吸水片材結構體厚度(mm),t2為生理食鹽水吸收後之吸水片材結構體中之壓紋厚度(mm)):(A)膨脹厚度比(T2/T1)為2以上;(B)膨脹壓紋深度[(T2-t2)/T2]為0.7以上]。本發明之吸水片材結構體係實現如下優異之效果:於液體吸收前或吸收後不會產生變形,可充分發揮優異之液體滲透性、低漏液量等之吸收能力。
