Unicharm Corporation

Koichiro Mitsui

Hironao Minato

Yasushi Sayama

Masaki Yoshida

Koichiro Tani

Kengo Ochi

Takayuki Miyoshi

Hisashi Takai

Hiroki Goda

Masashi Nakashita

Shinichi Ishikawa

Satoru Tange

Masato Isono

Junko Ueda

Qiye Yang

Masakazu Shiraishi

An absorbent body in absorbent articles that causes exudates to disperse in a planar direction and a method of producing the same. The absorbent body has an absorbent core material covered with a cover sheet. The core material has a mass per unit area of 650 g/mor less and includes a first liquid absorbent layer containing hydrophilic fibers and superabsorbent polymer particles in a mixed state and a second liquid absorbent layer containing the hydrophilic fibers but none of the superabsorbent polymer particles, wherein the first liquid absorbent layer and the second liquid absorbent layer are overlap with each other and the hydrophilic fibers are in contact with each other between the first liquid absorbent layer and the second liquid absorbent layer.

Absorbent body in absorbent article and method for producing the same

An absorbent article includes a liquid-pervious sheet, an outer covering sheet, and an absorbent structure sandwiched between the liquid-pervious sheet and the outer covering sheet. The absorbent structure includes a liquid-absorbent mixture composed of super-absorbent polymer particles and fluff pulp and nonwoven fabric sheet formed from long fibers of thermoplastic resin. The nonwoven fabric sheet is put in contact, along at least one surface thereof, with the liquid-absorbent mixture and has cross points at which the long fiber sealed together, and a nap height defined by a difference between a thickness measured before a napping test and a thickness measured after the napping test is at least 0.5 mm.

Absorbent article

An absorbent article includes a rear waist region provided with a waist region elastic member attached thereto under tension. The waist region elastic member is formed with a plurality of slits each extending in a longitudinal direction and extending through the elastic member in a thickness direction thereof. The waist region elastic member is stretched in a transverse direction as the diaper is put on the wearer's body and thereupon the slits are opened up to form respective through-holes. A first graphics display region formed in combination with the slits includes note stems and note tails. Each of these note stems is contiguous to the associated through-holes. In the area nearer a crotch region than the first graphics display region, a second graphics display region is formed. The first and second graphics display regions cooperate to each other.

A disposable diaper includes a body fluid absorbing zone extending over a crotch region further into front and rear waist regions, side flaps extending in a longitudinal direction outside transversely opposite side edges of the zone, and end flaps extending in a transverse direction outside longitudinally opposite ends of the zone. The side flaps in the front waist region are formed from a composite nonwoven fabric composed of a first fibrous nonwoven fabric facing away from the wearer's skin and a second fibrous nonwoven fabric laminated on the first fibrous nonwoven fabric and facing the wearer's skin. The first fibrous nonwoven fabric has a kinetic friction coefficient higher than a kinetic friction coefficient of the second fibrous nonwoven fabric.

Disposable diaper

A disposable diaper includes antislip elements having a frictional force higher than those of end flaps and side flaps. These antislip elements are attached to portions of the end flap extending immediately outside transversely opposite ends of a waist elastic member on the side of these portions facing away from the diaper wearer's skin. The waist elastic member is, in turn, attached to the end flap.

Disposable diaper having antislip elements

In a disposable diaper includes a pair of side flaps respectively extending from an end portion in a lateral direction of the diaper main body and a fixing tape disposed in proximity of a farthest edge of the respective side flaps, the fixing tape is provided with a hook member, the fixing tape and the side flaps are to be engaged via the hook member, and an engaging region on the side flaps where the fixing tape is to be engaged includes portions having a different engaging force with the hook member. As a result, the fixing tape can be temporarily fixed with a modest engaging force, despite the hook member having a greater engaging force.

A disposable diaper is formed in one of front and rear waist regions with first wings which are elastically stretchable in a waist-surrounding direction and these first wings are provided on respective body facing surfaces with first fastener elements. The other waist region is provided on its undergarment facing surface with, in addition to second fastener elements, anti-slip zones exhibiting a desired average kinetic frictional force relative to the body facing surface of the first wings.

A disposable wearing article is provided with a pair of tape fasteners each composed of inner and outer tape strips and a hook member. The outer tape strip has a proximal portion fixed to the side section of the rear waist region and a distal portion extending outwards from the side section. The inner tape strip has a proximal portion fixed to the side section, a first distal portion bonded to the distal portion of the outer tape strip, and a second distal portion extending outwards from the distal portion of the outer tape strip. The hook member is attached to at least the second distal portion of the inner tape strip. The tape fastener has first and second zones corresponding to the distal portions of the outer and inner tape strips. A stiffness of the second zone is lower than that of the first zone.

Disposable wearing article

A disposable wearing article includes a liquid-pervious topsheet, a liquid-impervious backsheet, a liquid-absorbent core interposed between the top- and backsheets, a pair of liquid-impervious leak-barrier sheets and a pair of elastically stretchable sheets. Each portion of the aforesaid sheets placed one upon another are joined together by means of adhesives and the core is joined to inner surfaces of the top- and backsheets by means of adhesives. Adhesives are defined by a plurality of adhesive lines continuously extending in a given direction and each of the adhesive lines includes first and second zones arranged alternately in the given direction along the adhesive line. A quantity of adhesives in the first zone is much more than a quantity of adhesives in the second zone.

A disposable diaper includes a pair of tape fastenersthat are used to connect front and rear waist regionsto each other and are attached to side flapsin the rear waist regionof the diaper. Each of the tape fastenersincludes fibrous nonwoven fabric made of thermoplastic synthetic resin fiber and thermoplastic synthetic resin coated on a substantially whole area of an outer surface of the fibrous nonwoven fabric wherein the thermoplastic synthetic resin forms a substantially smooth synthetic resin layer on outer surfaces of the respective tape fasteners. Thus, a free portion of each tape fastener is reliably prevented from being disengaged from a target tape even when the outer surface of the tape fastener and an inner surface of an underwear rub together during use of the diaper.

Diaper fastener with two nonwoven fabric components coated with thermoplastic synthetic resin

A disposable diaper is provided with elastically stretchable waist areas extending in a transverse direction along respective end portions of front and rear waist regions and a pair of elastically stretchable wing areas extending outward in the transverse direction from the side edge portions of the rear waist region. The side edge portions of the rear waist region are respectively interposed between the stretchable waist area and the stretchable wing areas. The stretchable wing areas have a transverse stretch stress higher than a transverse stretch stress of the stretchable waist area, so the tensile force exerted on the stretchable wing areas is segmentalized and restrained by the side edge portions of the rear waist region.

Growing community of inventors

Kagawa-ken, Japan

Koichiro Mitsui