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US 4,357,938 AGranted
Disposable diaper
AssigneeKao Soap Co., Ltd.
InventorsOsamu Ito, Harumasa Yamasaki, Kazunori Nishizawa
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AssigneeKao Soap Co., Ltd.
InventorsOsamu Ito, Harumasa Yamasaki, Kazunori Nishizawa
Estimating the term…
A disposable diaper comprising a water-absorbing layer located between a liquid-permeable surface sheet and a liquid-impermeable backing sheet, wherein water-absorbing shrinkable fibers, which shrink in the direction of the fiber length and are rendered elastic on absorption of water, are fixed to and extend along the central portion in the lengthwise direction of the disposable diaper in such a manner that the water-absorbing shrinkable fibers are not placed on top of the water-absorbing layer, and wherein means is provided so that the water-absorbing shrinkable fibers become wetted when the diaper is wetted, said water-absorbing shrinkable fibers exhibiting a percent shrinkage of at least 15% and a shrinking force of at least 100 g when said fibers are wetted.
A disposable diaper comprising a liquid-permeable surface sheet, a liquid-impermeable back sheet, a water-absorbing layer located between said sheets, and water-absorbing shrinkable fibers which shrink in the direction of the fiber length and are rendered elastic on absorption of water, said water-absorbing shrinkable fibers being fixed along the central portion and extending in the lengthwise direction of the disposable diaper and being located so that said water-absorbing shrinkable fibers are not placed on the water-absorbing layer but are capable of being wetted when the diaper is wetted, said water-absorbing shrinkable fibers, when wetted, exhibiting a percent shrinkable of at least 15% and a shrinking force of at least 100 g.
In a disposable diaper comprising a liquid-absorbing layer located between a liquid-permeable surface sheet and a liquid-impermeable backing sheet, the side edges of said liquid-absorbing layer being laterally inwardly spaced from the side edges of said sheets, said diaper having a central portion adapted to be extended between the legs of the wearer and having front and rear portions adapted to be secured together around the waist of the wearer and wherein the liquid-permeable surface sheet is adapted to be disposed facing the body of the wearer and the liquid-impermeable backing sheet is adapted to be disposed facing away from the body of the wearer, the improvement which comprises:
Dependencies are inferred from the claim text.