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WO2016121987A1 - Article absorbant présentant une partie extensible - Google Patents

Article absorbant présentant une partie extensible Download PDF

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Publication number
WO2016121987A1
WO2016121987A1 PCT/JP2016/052817 JP2016052817W WO2016121987A1 WO 2016121987 A1 WO2016121987 A1 WO 2016121987A1 JP 2016052817 W JP2016052817 W JP 2016052817W WO 2016121987 A1 WO2016121987 A1 WO 2016121987A1
Authority
WO
WIPO (PCT)
Prior art keywords
sheet
stretchable
sheet layer
absorbent article
elastic film
Prior art date
Application number
PCT/JP2016/052817
Other languages
English (en)
Japanese (ja)
Inventor
藤田　雅也
Original Assignee
大王製紙株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2015017498A external-priority patent/JP5980355B2/ja
Priority claimed from JP2015195470A external-priority patent/JP6429757B2/ja
Application filed by 大王製紙株式会社 filed Critical 大王製紙株式会社
Publication of WO2016121987A1 publication Critical patent/WO2016121987A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B29C65/083—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil
    • B29C65/086—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil using a rotary anvil
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape specially adapted to be worn around the waist, e.g. diapers, nappies
    • A61F13/496—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape specially adapted to be worn around the waist, e.g. diapers, nappies in the form of pants or briefs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/433—Casing-in, i.e. enclosing an element between two sheets by an outlined seam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/729—Textile or other fibrous material made from plastics
    • B29C66/7294—Non woven mats, e.g. felt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • B29C66/81429—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth comprising a single tooth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81433—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined being toothed, i.e. comprising several teeth or pins, or being patterned
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83413—Roller, cylinder or drum types cooperating rollers, cylinders or drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8351—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws
    • B29C66/83511—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws jaws mounted on rollers, cylinders or drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83415—Roller, cylinder or drum types the contact angle between said rollers, cylinders or drums and said parts to be joined being a non-zero angle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/48—Wearing apparel
    • B29L2031/4871—Underwear
    • B29L2031/4878—Diapers, napkins

Definitions

  • the present invention relates to an absorbent article having a stretchable part, typically a disposable diaper, a disposable pad or a sanitary napkin, comprising a stretchable sheet in which a first sheet layer and a second sheet layer sandwich an elastic film.
  • an absorbent article for example, a disposable diaper
  • stretchability in order to improve fit to the body surface, it is common to impart stretchability to appropriate places such as around the legs and around the trunk.
  • a method for imparting stretchability conventionally, a method of fixing an elongated elastic stretchable member such as rubber thread in a stretched state in the longitudinal direction has been widely adopted, but it is desired to impart stretchability to a certain width. In such a case, a mode is adopted in which the rubber thread is fixed in a state of being arranged side by side with an interval in the width direction.
  • the hot melt adhesive for fixing the thread rubber to the sheet is likely to be temporally or thermally deteriorated, and further, the adhesive strength may be lowered under wet conditions.
  • Patent Document 1 It has also been proposed to use an elastic film instead of juxtaposing the rubber thread (Patent Document 1). However, the fixing means of the elastic film is not clear. On the other hand, in place of a plurality of thread rubbers arranged in parallel, it has been proposed to use a nonwoven fabric / elastomer film / nonwoven fabric as a material that presses against a surface strip to give stretchability and takes the touch into consideration. (For example, refer to Patent Document 2).
  • Patent Document 2 supplies an elastic film that expands and contracts in the continuous MD direction between the first outer layer and the second outer layer, which has a higher melting point or no melting point, and at a predetermined position. And a second outer layer are directly bonded by welding, and then a pulling force is applied to the CD direction to form a through hole penetrating the first outer layer, the elastic film, and the entire second outer layer at the bonding site. is there.
  • the stretchable sheet according to Patent Document 2 is intended for continuous production, the pattern of the raised portions in the thermal bonding roller forming the joint portion is uniform in the width direction and the circumferential direction, and thus the produced stretchable sheet. Even if the sheet has different positions in the width direction, the stretching stress is uniform. Therefore, it cannot be said that this stretchable sheet has a wide range of uses.
  • a main problem of the present invention is to provide an absorbent article having an expansion / contraction part having different expansion / contraction stress depending on the position in the expansion / contraction sheet.
  • the present invention that has solved the above problems is as follows.
  • the absorbent article of the present invention includes a three-dimensional gather formed on both sides by an elastic sheet having an elastic part that can be extended and contracted in the front-rear direction.
  • an elastic film that is stretchable in the front-rear direction is laminated between a first sheet layer made of, for example, a non-woven fabric that does not have stretchability, and a second sheet layer, made of, for example, a non-woven fabric that does not have stretchability.
  • the first sheet layer and the second sheet layer are joined at a large number of joints that are spaced apart, either directly or via an elastic film.
  • the expansion / contraction part contracts due to the contraction force of the elastic film, and can expand when an external force is applied in the front-rear direction.
  • the joint area ratio occupied by the total area of the joints included in the unit area is different in the width direction, so that the stretch stress in the front-rear direction is different between the width directions.
  • the stretchable portion is formed in the middle in the front-rear direction, and it can be a region that does not exhibit stretchability or is less stretchable up to the end in the front-rear direction.
  • the stretchable part may be a straight line or a curved line.
  • a disposable diaper may draw a constricted curve toward the center in the width direction in the crotch area.
  • the arrangement of the joints is not limited, but can be, for example, staggered.
  • the said expansion-contraction part it can be set as the structure from which the junction part area ratio differs in the front-back direction.
  • the joint area ratio is different in the front-rear direction, and the joint area ratio increases toward the edge at least in the front-rear direction edge side of the stretchable part. It can be adopted.
  • the central part of the stretchable part strengthens the stretch force and weakens the stretch force from there toward the end, thereby preventing the diaper end from becoming easily rounded, and also has the advantage of improving wearability to the wearer. .
  • the structure may be such that the joint area ratio is different in the width direction.
  • the width direction side edge of the stretchable part has a high bonding area ratio of the wrinkles and the width direction center has a low bonding area ratio of the wrinkles.
  • the outer shape of the diaper is easily rounded in the cross section and the fitting property is improved.
  • the second aspect is a configuration in which the widthwise side edge of the stretchable portion has a low bonding area ratio of the folds and the width direction center has a high bonding area ratio of the folds. In this case, there is an advantage that the tightening force at the crotch portion is high for a person with thick legs.
  • the elastic film may be stretchable in the width direction.
  • the joint may be longer in the width direction than in the front-rear direction.
  • the absorbent article of the present invention includes disposable diapers and sanitary napkins.
  • the stretchable sheet of the present invention no hole penetrating the first sheet layer and the second sheet layer is formed. This point is different from the stretchable sheet shown in FIG. 5 or 7 of Japanese Patent No. 4562391.
  • the first sheet layer and the second sheet layer may be joined through through holes formed in the elastic film at a large number of joints spaced apart. That is, a through hole may be formed in the elastic film.
  • the difference in elastic film strength occurs between the joined part and the non-joined part. Therefore, after the stretched state of the stretch sheet holding the extension is once released and contracted to make a product; or after the stretch sheet holding the stretch is combined with another member, the stretched state is once released and contracted When the product is stretched mechanically or manually in the expansion / contraction direction, breakage occurs at the boundary between the joined portion and the non-joined portion. As a result, a through hole is formed.
  • the stretchable sheet having stretchable parts that can be stretched in the front-rear direction and formed on at least both side parts can be manufactured, for example, by the following method.
  • the elastic film is interposed between the first sheet layer and the second sheet layer, and is spaced from the outside of the first sheet layer and the second sheet layer by a heat melting device.
  • the elastic film is provided with heat melting energy by a large number of heat melting portions opened to melt the elastic film, and the first sheet layer and the second sheet layer can be directly connected to the elastic film through the elastic film.
  • Joining process of joining with, Including the stretchable sheet is formed in which no hole is formed in the entire joint region and the first sheet layer and the second sheet layer remain. And an absorptive article is manufactured using this elastic sheet as a material.
  • the elastic film is passed through a nip roll step in which a pair of opposing nips are arranged in the front-rear direction, and the elastic speed is increased by increasing the peripheral speed of the front nip roll step relative to the peripheral speed of the rear nip roll step between the front and rear nip roll steps.
  • a method is provided for feeding a film to the feeding step in a stretched state. Another method may be to pass only a pair of nip rolls while winding the elastic film around the drive roll in, for example, an S shape.
  • the heat melting apparatus has an anvil roll and an ultrasonic horn, and the anvil roll has a plurality of protrusions formed on the outer surface thereof spaced apart in the roll length direction and the outer peripheral direction.
  • the aspect which comprises the said thermal fusion part with an ultrasonic horn is provided.
  • the ultrasonic heat melting apparatus other heat melting means may be used.
  • the melting point of the elastic film is lower than the melting point of the first sheet layer made of nonwoven fabric and the melting point of the second sheet layer made of nonwoven fabric, higher than this melting point, and lower than the melting points of the first sheet layer and the second sheet layer.
  • the melting energy corresponding to the temperature is applied, the elastic film is melted by heat, while the first sheet layer and the second sheet layer are not melted at all or are partially melted. As a result, holes are formed in the entire joint region. The first sheet layer and the second sheet layer remain. However, the line speed at the time of manufacturing the elastic sheet is high.
  • the elastic film preferably has a melting point of about 80 to 145 ° C.
  • the first sheet layer and the second sheet layer preferably have a melting point of about 85 to 190 ° C., particularly about 130 to 190 ° C.
  • the difference between the melting points of the first sheet layer and the second sheet layer and the melting point of the elastic film 30 having a lower melting point is preferably about 50 to 80 ° C.
  • the melting point of the elastic film is 95 to 125 ° C.
  • the melting point of the first sheet layer is more than 125 ° C. to 160 ° C., more preferably 130 to 160 ° C.
  • the melting point of the second sheet layer is 125. More than 160 ° C. to 160 ° C., more preferably 130 to 160 ° C.
  • the area of the joint portion in the stretchable region is 0.14 to 3.5 mm 2
  • the area of the opening of the through hole in the natural length state is 1 to 1 of the area of the joint portion.
  • the area ratio of the joint in the stretchable region is 1.8 to 22.5%.
  • the “area ratio” means the ratio of the target portion to the unit area, and the total area of the target portion (for example, joints and openings of through holes) in the target region (for example, the stretchable region) is the area of the target region.
  • the “joint area ratio” means the area ratio in a state of being stretched to the elastic limit in the stretching direction.
  • the area of the opening of the through hole means a value in a state in which the stretchable structure is in a natural length, and the area of the opening of the through hole is not uniform in the thickness direction, such as different between the front and back of the elastic film. Means the minimum value.
  • the joint area ratio in the present specification can be selected by selecting the size, shape, separation interval, arrangement pattern in the roll length direction and roll circumferential direction, etc. of the protrusions of the anvil roll described later.
  • “Elongation stress” is measured by a tensile test according to JIS K7127: 1999 “Plastics—Test method for tensile properties—” with an initial chuck interval (distance between marked lines) of 50 mm and a tensile speed of 300 mm / min. It means “stress when stretched to 50% of elastic limit (N / 35 mm)”.
  • the test piece is created with a width that can be cut out, and the measured value is set to a value converted into a width of 35 mm. If the target area is small and sufficient specimens cannot be collected, a comparatively small specimen can be compared at least if it is a comparison of stretching stress.
  • an absorbent article having three-dimensional gathers formed on both sides can be obtained by the stretchable sheet having stretchable parts that can be stretched in the front-rear direction. And since the three-dimensional gather is joined using, for example, the melting of the constituent layers, the joined portion does not come off, and as a result, there is no deterioration in the region where the stretching force is exerted and it is stable.
  • FIG. It is a top view of the example of a tape type disposable diaper.
  • FIG. It is a 22-22 line arrow directional view. It is a 23-23 line arrow directional view. It is a top view which shows the various arrangement
  • FIG. It is an expanded state top view of an example of a pants type disposable diaper.
  • FIG. It is a 22-22 line arrow directional view. It is a 28-28 arrow line view. It is a 29-29 line arrow directional view.
  • the absorbent article of the present invention means a product that absorbs and retains body fluids such as disposable diapers, sanitary napkins, and absorbent pads.
  • the absorbent article includes a three-dimensional gather formed on both sides by an elastic sheet having an elastic part that can expand and contract in the front-rear direction.
  • the stretchable sheet is formed between a first sheet layer 21 made of, for example, a non-woven fabric that does not have stretchability, and a second sheet layer 22 made of, for example, a non-woven fabric that does not have stretchability.
  • the elastic film 30 that can be expanded and contracted in the front-rear direction is laminated, and the first sheet layer 21 and the second sheet layer 22 are directly or via the elastic film 30 with a large number of bonding portions. 40 is joined.
  • “the first sheet layer 21 and the second sheet layer 22 are not stretchable” does not mean that the first sheet layer 21 and the second sheet layer 22 are not stretched at all. It means not.
  • the first sheet layer 21, the elastic film 30, and the second sheet are disposed between the anvil roll 60 having the protrusions 60 a formed in a predetermined pattern on the outer surface and the ultrasonic horn 61.
  • the sheet layer 22 is supplied, and ultrasonic melting energy is applied by the ultrasonic horn 61.
  • the elastic film 30 is mainly melted to join the first sheet layer 21 and the second sheet layer 22.
  • it explains in full detail later.
  • the elongation rate in the manufacturing process of the elastic film 30 (based on the length of the natural state being 100%) is, for example, that the peripheral speed of the driving anvil roll 60 is faster than the peripheral speed of the rear driving roll 62. It can be set by selecting the speed difference between the rolls.
  • 63 is a guide roller.
  • FIG. 6 schematically shows a cross section of the stretchable sheet after joining in the stretched state.
  • the stretchable sheet contracts due to the contraction force of the elastic film 30 and can be stretched by applying an external force in the front-rear direction (left-right direction in FIG. 7). Therefore, when the expansion / contraction direction of this stretchable sheet is matched with, for example, the front / rear direction of the disposable diaper, the disposable diaper can be expanded / contracted in the front / rear direction.
  • an elastic sheet can be manufactured with a predetermined area, when it is desired to apply a contracting force to the entire desired area, the elastic sheet cut into the desired area may be applied.
  • conventional disposable diapers it is generally performed by fixing a plurality of thread rubbers in parallel to the sheet, but this reduces quality due to deterioration of thread rubber and hot melt adhesive for fixing to the sheet, In addition, it is inferior in terms of stable productivity during production.
  • the first sheet layer 21 and the second sheet layer 22 are joined by melting the elastic film 30.
  • the bonding mode between the layers is not limited to these examples.
  • the first sheet layer 21 and the second sheet layer 22 are joined directly, that is, without interposing an elastic film.
  • the above aspects (1) to (3) are cases where the melting point of the elastic film 30 is lower than the melting points of the first sheet layer 21 and the second sheet layer 22, but the melting point of the elastic film 30 is the first sheet layer. 21 and / or higher than the melting point of the second sheet layer 22.
  • the elastic film 30 side surface portion of the first sheet layer 21 and / or the second sheet layer 22 is activated or melted and joined to the elastic film 30.
  • the elastic film 30 may be partly melted, and the first sheet layer 21 and / or the second sheet layer 22 may be joined by melting.
  • the 1st sheet layer 21 and / or the 2nd sheet layer 22 are nonwoven fabrics, and the fiber may have a core-sheath structure. In this case, for example, only the sheath component of the fiber can be melted and contribute to the joining.
  • the main feature of the present invention is that at least a stretchable portion is provided in the central region in the width direction, and the stretchable portions are formed on both sides of the absorbent article. And, in the stretchable sheet, the stretchable stress in the front-rear direction is different between the width directions because the joint area ratio occupied by the total area of the joints included in the unit area is different in the width direction. It is. As a means for this, the ratio of the total area of the joints included in the unit area of the region to the unit area, that is, the joint area ratio is selected.
  • the present invention provides a high effect or advantage when applied to a disposable diaper, particularly a tape-type disposable diaper. Let's assume that this is applied to a tape-type disposable diaper.
  • the other region for example, the side edge region or the front and back region of the diaper also shows stretchability
  • the shape and flatness of that region are not determined, and the diaper is applied to the wearer. It is hard to put on.
  • the widthwise central region is stretchable, the folds or wrinkles of the central region that repeats unevenness in the front-rear direction may reach the side edge region, and so-called side leakage may occur. Therefore, the use of the stretchable sheet is extremely useful when the stretchability is provided only around the legs.
  • the joint area ratio is a percentage of the total area of the joints 40, 40... Included in the unit area S.
  • the unit area S in this case is desirably set to a size that includes 10 or more joints (it is difficult to compare the stretching stress with a small number).
  • 13 joint portions are included.
  • the external shape which defines unit area S may be other shapes, such as a rectangle and a circle, besides a square.
  • An example of the joint 40 is a circle shown in FIG. Of course, the shape may be an ellipse or a rectangle. In FIG.
  • Lm is an arrangement interval length in the machine direction
  • Lc is an arrangement interval length in an orthogonal direction (cross direction) orthogonal to the machine direction
  • Pm is a machine direction (MD pitch length
  • Pc is an orthogonal direction (cross direction: CD) ) Pitch length.
  • the expansion stress is in the relationship of A> B by setting the joint area ratio to A ⁇ B.
  • the case A when the pitch length Pm and the pitch length Pc are long and A is compared with the case B when the pitch length Pm and the pitch length Pc are short, the case A (when the joint area ratio is low) is long.
  • the pitch length Pm ⁇ Pc when the pitch length Pm ⁇ Pc is short, the elongation ratio is larger than that in B (when the joint area ratio is high).
  • the stretching stress has a relationship of A> B.
  • the form of FIG. 2 differs in the extensional stress in the lateral direction of FIG.
  • the B region having a small expansion and contraction stress is arranged before and after the intermediate region A in the front-rear direction.
  • the front and rear B regions and the B region can correspond to, for example, front and rear end portions of the disposable diaper. Since the stretching stress is small at the front and rear end portions, the shape stability is good. It becomes easy to attach to.
  • the difference in the joint area ratio can be achieved by changing the joint area in addition to the density of the arrangement pattern.
  • FIG. 4 shows an example in which a large number of small junctions are arranged in the region C so as to have the same junction area as the region D.
  • the elastic film in the present invention may be stretchable only in the front-rear direction, but a two-way stretchable film that stretches in the orthogonal direction can also be used.
  • the elastic film Physical properties such as thickness, material, strain / stress characteristics, melting point, etc. of the elastic film can be selected as appropriate. By selecting the relationship between this elastic film, the ultrasonic melting energy applied thereto, and the elongation rate of the elastic film at the time of manufacturing the stretchable sheet, as shown in FIG. 31 can be formed.
  • the first sheet layer 21 and the second sheet layer 22 are formed of, for example, a nonwoven fabric, the nonwoven fabric exhibits air permeability. Therefore, for example, when used as an outer sheet or an outer sheet of a disposable diaper, the air permeability is good.
  • the reason why the ventilation through hole 31 is formed is not necessarily clear, but the elastic film 30 is melted by the ultrasonic melting energy, and the connecting portion 40 is thinned by the pressing by the projection 60 a of the anvil roll 60. At this time, the elastic film 30 is also thinned, the peripheral portion of the joint portion 40 reaches the breaking strength, the breakage is started by the stretching stress acting on the stretched elastic film 3, shrinks to the balanced portion, and opens. it is conceivable that.
  • FIG. 10 schematically shows an example of forming the through hole 31 in the case of a circular through hole.
  • a substantially crescent-shaped through hole 31 is formed on both sides of the connecting portion 40 in the machine direction (extension direction).
  • the connecting part can be formed in a long shape in a direction (cross direction: CD direction) orthogonal to the machine direction (extension direction).
  • a semicircular through hole 31 having a large opening can be formed.
  • the through holes 31 it is not essential for the through holes 31 to be formed in all the coupling portions. If it is required to reliably form the through-hole 31 or to open a large hole, the technique shown in FIG. 12 can be adopted. That is, as shown in FIG. 12B, the stretchable sheet in which the coupling portion 40 is formed is passed between a pair of rolls 64 having ridges or protrusions 64a, and between adjacent protrusions 64a and 64a of one roll 64.
  • the through-hole 31 can be formed by biting the protrusion 64a of the other roll 64 and applying a deformation force to the stretchable sheet.
  • the stretchable sheet according to the present invention can be applied to disposable diapers.
  • the tape-type disposable diaper TD1 having the tape T on both sides on the back side extends in the front-rear direction around the crotch area on both sides of the product, that is, expands and contracts in the front-rear direction.
  • the three-dimensional gather G which has the expansion-contraction part 83 can be formed.
  • the stretchable portion 83 is formed by partially making the engagement portion area ratio smaller than the engagement portion area ratio of other portions.
  • the engagement portion area ratio of the expansion / contraction portion 83 along the front-rear direction and the engagement portion area ratio are different between the width-direction both side regions, so that the expansion / contraction in the front-rear direction is performed between the width directions. It is set as the structure from which the stress differs.
  • the engagement part area ratio of the expansion / contraction part 83 and the front / rear area in the front / rear direction are different, so that the expansion / contraction stress in the front / rear direction is different between the front / rear directions. It is what.
  • the expansion-contraction part 83 expands / contracts, the whole expansion-contraction part 83 contact
  • the tape-type disposable diaper has an overall structure that is known to those skilled in the art in addition to the tape T, the illustration and description thereof are kept to a minimum. And materials and structures, such as an absorber and a top sheet, can be chosen suitably.
  • the tape-type disposable diaper may be of a so-called “fundoshi” type in which the front body is wrapped with a long tape Ta as shown in FIG.
  • the tape-type disposable diaper may be a so-called “straight type” with straight edges on both sides as shown in FIG.
  • it may be a pad type disposable diaper PD which is not provided with a tape and is arranged as it is inside the underwear or inside the tape type disposable diaper.
  • the stretching stress can be made different between the front and rear in the stretchable part 83B. That is, it is preferable to increase the expansion / contraction stress in the middle part in the front-rear direction of the expansion / contraction part 83B and decrease the expansion / contraction stress in the front / rear direction.
  • the center part of the stretchable part where gaps are easy to be formed strengthens the stretch force so that it closely adheres to the legs. There is also an advantage that it is easy to attach to. Such an aspect. This is an aspect that cannot be adopted when using rubber thread.
  • the stretch stress can be made different in the width direction.
  • FIG. 19 when the expansion / contraction stress in the width direction of the expansion / contraction portion 83C is reduced and the expansion / contraction stress in the width direction is increased, the wearer with a thick thigh is Tightening force increases and fit is enhanced.
  • absorbent articles As a specific example of the absorbent article of the present invention, particularly in a disposable diaper, a cover-type disposable diaper that does not have an absorbent element on the use surface side, or an elastic sheet as an exterior sheet, and the absorbent element is provided on the use surface side You can also.
  • this absorbent body an absorbent body mainly composed of cotton-like pulp or an absorbent body containing a high-molecular-weight absorbent polymer in the cotton-like pulp layer can be used.
  • the melting point of the elastic film 30 is set higher than the melting points of the first sheet layer 21 and / or the second sheet layer 22, but the joining portion is formed, but the through hole is not formed.
  • the basis weight of the absorber is 200 g / m 2 or less, more desirably 150 g / m 2 or less.
  • Absorbers to be used are known ones such as pulp fiber stacks, aggregates of filaments such as cellulose acetate, or non-woven fabrics as basic elements. What mixed an adsorbent polymer, adhering, etc. can be used.
  • This absorbent body can be packaged with a packaging sheet having liquid permeability and liquid retention, such as crepe paper, if necessary, for holding the shape and polymer.
  • the shape of the absorbent body can be formed in an almost hourglass shape having a narrowed portion narrower than the front and rear sides at the crotch portion, and can also have an appropriate shape such as a rectangular shape.
  • tape-type disposable diapers 20 to 23 show an example of a tape-type disposable diaper.
  • the absorbent body 3 is interposed between the inner surface of the back sheet 9 forming the back surface and the liquid-permeable top sheet 2. It is what has been.
  • seat) is provided in the disposable diaper by the elastic sheet 1 which has the expansion-contraction part which can be expanded-contracted in the front-back direction.
  • the back sheet 9 constituting the liquid-impermeable back sheet extends outside the periphery of the absorber 3 and blocks movement of excrement absorbed by the absorber 3 to the back side. .
  • a sheet having moisture permeability can be used without impairing water shielding from the viewpoint of preventing stuffiness.
  • the entire back surface of the back sheet 6 is covered with a nonwoven fabric layer 9A, and the outer periphery of the back sheet 6 extends to the outer periphery of the diaper.
  • a spunbonded nonwoven fabric is suitable as the nonwoven fabric layer 9A.
  • top sheet As the top sheet 2, a perforated or non-porous nonwoven fabric or a perforated plastic sheet is used.
  • material fiber constituting the nonwoven fabric synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and amide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used.
  • processing method of a nonwoven fabric well-known methods, such as the spunlace method, the spun bond method, the SMS method, the thermal bond method, the melt blown method, the needle punch method, the air through method, the point bond method, can be used.
  • the fiber basis weight of the nonwoven fabric used for the liquid-permeable top sheet 2 is preferably 15 to 30 g / m 2 , and the thickness is preferably 0.05 to 1 mm.
  • the top sheet 2 extends outward from the periphery of the absorber 3, and a portion extending outward from the side edge of the absorber 3 is fixed to the stretchable sheet 1 by, for example, a hot melt adhesive.
  • the dot pattern in a figure represents the adhering part.
  • leg gathering three-dimensional gathers G are provided on both sides of the disposable diaper.
  • An example of the configuration is shown.
  • the stretchable sheet 1A that forms a three-dimensional gather is obtained by laminating a wide first sheet layer 21, short-width elastic films 30 and 30, and a wide second sheet layer 22.
  • each constituent layer of the stretchable sheet 1A may have the same width.
  • the elastic sheet 1A is fixed to the back sheet 9 on the outer side.
  • the stretchable sheet 1A of the leg gathering three-dimensional gathers is fixed to the inner surface of the article (in the illustrated form, the top sheet 2 surface) by means of a hot melt adhesive at both ends in the front-rear direction, and is a lying portion.
  • the middle part in the front-rear direction is a non-fixed free part, and as a result of contraction force acting, as shown in FIG. 23, it stands up with respect to the use surface of the diaper (surface of the top sheet 2 in the illustrated embodiment)
  • a leg gathering solid gather G is constructed.
  • regions other than the stretchable portion 83 and the stretchable portion 84 of the stretchable sheet 1A are substantially non-stretchable regions by increasing the bonding area ratio.
  • the inside of the stretchable sheet 1A constitutes a three-dimensional gather G with the stretchable part 83, and the outside of the stretchable sheet 1A constitutes a planar gather with the stretchable part 84.
  • Fastening tapes T that protrude from the side edges are attached to the side flaps of the back part B, and the front target tape 6 is stuck along the width direction on the waist part surface of the abdomen part Fr.
  • the fastening tape T on both sides is turned from each side of the waist to the abdomen outer surface and fastened to the front target tape 6 via the hook material 5.
  • the front target tape 6 can be omitted.
  • the fastening tape T is directly hooked and fixed to the nonwoven fabric on the outer surface of the diaper.
  • Reference numeral 7 denotes a dividing perforation.
  • the constituent material of the first sheet layer 21 and the second sheet layer 22 can be used without particular limitation as long as it is a sheet, but it is preferable to use a nonwoven fabric from the viewpoint of air permeability and flexibility.
  • the nonwoven fabric is not particularly limited as to what the raw fiber is.
  • synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated.
  • the nonwoven fabric may be manufactured by any processing.
  • the processing method examples include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method.
  • the basis weight is preferably about 10 to 25 g / m 2 .
  • each joint part 40 and the through-hole 31 is arbitrary, such as a perfect circle, an ellipse, polygons, such as a rectangle (including a linear or rounded thing), a star shape, a cloud shape, etc. It can be made into the shape.
  • the size of each joint 40 may be determined as appropriate, but if it is too large, the effect of the hardness of the joint 40 on the feel will increase, and if it is too small, the joint area will be small and the materials will not be sufficiently bonded together. Therefore, in general, the area of each joint 40 is preferably about 0.14 to 3.5 mm 2 .
  • the opening area of each through-hole 31 may be equal to or greater than the joint because the joint is formed through the through-hole 31, but is preferably about 1 to 1.5 times the area of the joint.
  • middle can also be formed.
  • the area and the area ratio of each joint 40 in each region are preferably set as follows.
  • Non-stretchable area Area of the joint 40: 0.14 to 3.5 mm 2 (particularly 0.25 to 1.0 mm 2 ) Area ratio of the joint 40: 16 to 45% (especially 25 to 45%) (Main stretchable part 83) Area of the joint 40: 0.14 to 3.5 mm 2 (particularly 0.14 to 1.0 mm 2 ) Area ratio of the joint 40: 1.8 to 19.1% (particularly 1.8 to 10.6%) (Transition expansion / contraction part) Area of the joint 40: 0.14 to 3.5 mm 2 (particularly 0.25 to 1.0 mm 2 ) Area ratio of the joint 40: 8 to 22.5% (especially 12.5 to 22.5%)
  • the planar arrangement of the joints 40 and the through-holes 31 can be determined as appropriate, but is preferably a regularly repeated planar arrangement, such as an oblique lattice shape as shown in FIG. 24 (a) or as shown in FIG. 24 (b). Hexagonal lattice shape (these are also called staggered shapes), a square lattice shape as shown in FIG. 24C, a rectangular lattice shape as shown in FIG. 24D, and a parallel shape as shown in FIG. Body lattice (in the form shown in the figure, two groups are provided so that a large number of groups of parallel diagonal rows intersect each other), etc.
  • the group of joints 40 (in which these are inclined at an angle of less than 90 degrees with respect to the expansion / contraction direction)
  • group of joints 40 (group unit arrangement may be regular or irregular, and may be a pattern, a character shape, etc.) shall be regularly repeated. You can also.
  • the arrangement form of the joint portion 40 and the through-hole 31 may be the same or different in the main stretchable portion 83, the transition stretchable portion, and the non-stretchable region.
  • the elastic film 30 is not particularly limited, and can be used without particular limitation as long as it is a resin film having its own elasticity.
  • a styrene-based elastomer, an olefin-based elastomer, a polyester-based elastomer, a polyamide-based elastomer, and a polyurethane-based film can be used.
  • a product obtained by processing one or two or more blends of thermoplastic elastomers such as elastomers into a film by extrusion molding such as a T-die method or an inflation method can be used.
  • the elastic film 30 the thing in which many holes and slits were formed for ventilation other than a non-porous thing can also be used.
  • the tensile strength in the stretching direction is 8 to 25 N / 35 mm
  • the tensile strength in the direction perpendicular to the stretching direction is 5 to 20 N / 35 mm
  • the tensile elongation in the stretching direction is 450 to 1050%
  • the direction perpendicular to the stretching direction is preferable.
  • the tensile strength and tensile elongation were determined according to JIS K7127 except that a tensile tester (for example, AOUTGRAPHAGS-G100N manufactured by SHIMADZU) was used and the test piece was a rectangular shape having a width of 35 mm and a length of 80 mm.
  • a tensile tester for example, AOUTGRAPHAGS-G100N manufactured by SHIMADZU
  • the thickness of the elastic film 30 is not particularly limited, but is preferably about 20 to 40 ⁇ m.
  • the basis weight of the elastic film 30 is not particularly limited, but is preferably about 30 to 45 g / m 2 , particularly preferably about 30 to 35 g / m 2 .
  • FIG. 25 to FIG. 29 show a pants-type disposable diaper.
  • This pants-type disposable diaper (hereinafter also simply referred to as a diaper) has an exterior body 20 that forms a front body Fr and a back body Ba, and an interior body 10 that is fixed to and integrated with the inner surface of the exterior body 20.
  • the interior body 10 is formed by interposing an absorbent body 13 between a liquid-permeable top sheet 11 and a liquid-impermeable back sheet 12.
  • a joining means such as a hot melt adhesive (shaded portion 10B in FIG. 21)
  • the interior body 10 and the exterior body 20 are joined.
  • a pants-type disposable diaper having a waist opening and a pair of left and right leg openings is formed.
  • the interior body 10 has an absorbent body 13 interposed between a liquid-permeable top sheet 11 made of nonwoven fabric or the like and a liquid-impermeable back side sheet 12 made of polyethylene or the like.
  • the excretory fluid that has permeated through the top sheet 11 is absorbed and retained.
  • the planar shape of the interior body 10 is not particularly limited, but is generally rectangular as illustrated.
  • a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used as the liquid-permeable surface sheet 11 covering the surface side (skin contact surface side) of the absorbent body 13.
  • the material fibers constituting the nonwoven fabric can be made of synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester or polyamide, recycled fibers such as rayon or cupra, natural fibers such as cotton, and the spunlace method.
  • a nonwoven fabric obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft.
  • liquid permeable surface sheet 11 When a large number of through holes are formed in the liquid permeable surface sheet 11, urine and the like are quickly absorbed, and the dry touch property is excellent.
  • the liquid permeable top sheet 11 is wound around the side edge of the absorber 13 and extends to the back side of the absorber 13.
  • liquid-impermeable back sheet 12 that covers the back surface side (non-skin contact surface side) of the absorbent body 13 a liquid-impermeable plastic sheet such as polyethylene or polypropylene is used. Those having wettability are preferably used.
  • This water-impervious and moisture-permeable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. is there.
  • Absorbent body 13 is a known one, for example, a pulp fiber stack, a filament aggregate such as cellulose acetate, or a non-woven fabric, mixed with a superabsorbent polymer as necessary, fixed, etc. Can be used.
  • the absorbent body 13 can be packaged with a wrapping sheet 14 having liquid permeability and liquid retention, such as crepe paper, if necessary, for holding the shape and polymer.
  • the shape of the absorber 13 is formed in a substantially hourglass shape having a narrowed portion 13N having a narrower width than the front and rear sides in the crotch portion, but may be an appropriate shape such as a rectangular shape.
  • the size of the constricted portion 13N can be determined as appropriate, but the length in the front-rear direction of the constricted portion 13N can be about 20 to 50% of the total length of the diaper, and the width of the narrowest portion is 40% of the total width of the absorber 13. It can be about 60%.
  • the planar shape of the interior body 10 is substantially rectangular, the remainder of the interior body 10 that does not have the absorber 13 in the portion corresponding to the constricted portion 13N of the absorber 13 A part is formed.
  • 3D gather GA that fits around the legs is formed on both sides of the interior body 10.
  • This three-dimensional gather GA is formed by the stretchable sheet 1B according to the present invention, and as shown in FIGS. 28 and 29, a fixed portion fixed to the side of the back surface of the interior body, and from this fixed portion to the interior body A body part that extends to the side of the surface of the interior body through the side, a lodging part that is formed by fixing the front and rear ends of the body part to the side part of the surface of the interior body in a lying state, and this lodging part The space is an unfixed free part.
  • the elastic sheet 1B forming the three-dimensional gather GA has an elastic film 30 disposed on the tip side thereof to constitute an elastic part that expands and contracts in the front-rear direction, and is elastic as shown by a two-dot chain line in FIG. The free part is raised by the stretching force of the film 30 to form the three-dimensional gather GA.
  • the liquid-impermeable back sheet 12 is folded back on the both sides in the width direction of the absorber 13 together with the liquid-permeable surface sheet 11.
  • the liquid-impermeable back side sheet 12 it is desirable to use an opaque sheet so that brown such as defecation and urine does not appear.
  • a plastic film and a pigment and filler such as calcium carbonate, titanium oxide, zinc oxide, white carbon, clay, talc and barium sulfate are preferably used.
  • the exterior body 20 is provided with an elastic film 30 and an elongated elastic member 24 along the width direction between the first sheet layer 21 and the second sheet layer 22, Elasticity in the width direction is given.
  • the planar shape of the exterior body 20 has a pseudo hourglass shape as a whole due to concave leg-around lines 29 formed to form leg openings on both sides of the middle.
  • the exterior body 20 may be divided into two parts in the front-rear direction so that both are separated in the front-rear direction at the crotch part.
  • the waist portion 23 is located on the waist portion 23 in the waist region T defined as the longitudinal range of the side seal portion 26 where the front body Fr and the back body Ba are joined.
  • An elastic member 24 is provided.
  • the waist elastic member 24 in the illustrated form is an elongated elastic member such as a plurality of rubber bands arranged at intervals in the vertical direction, and gives a stretching force so as to tighten around the body torso.
  • the waist elastic members 24 are not arranged substantially as a single bundle with a close spacing, but with a spacing of about 3 to 8 mm so as to form a predetermined stretch zone, preferably three or more, preferably Five or more are arranged.
  • the elongation rate at the time of fixing the waist elastic member 24 can be determined as appropriate, but can be about 230 to 320% for a normal adult.
  • the waist elastic member 24 one or a plurality of belt-like elastic members can be used.
  • the waist elastic member 24 thread rubber is used in the illustrated example. However, for example, a tape-like elastic member may be used. Alternatively, the elastic film 30 may extend to the waist 23.
  • the waist elastic member 24 in the illustrated form is sandwiched between folded portions 20C formed by folding the constituent material of the second sheet layer 22 to the inner surface side at the waist opening edge. You may pinch
  • Elongation rate means a value when the natural length is 100%.
  • Weight is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 20 ⁇ 5 ° C., relative humidity 65% or less) to obtain a constant weight. Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%.
  • a sample with a size of 200 mm ⁇ 250 mm ( ⁇ 2 mm) is cut out from the test piece in a constant weight using a rice-basis plate (200 mm ⁇ 250 mm, ⁇ 2 mm). Measure the weight of the sample, multiply it by 20, calculate the weight per square meter, and use it as the basis weight. • “Thickness” is automatically measured using an automatic thickness measuring instrument (KES-G5 handy compression measurement program) under the conditions of load: 10 gFr / cm 2 and pressure area: 2 cm 2 . ⁇ If there is no description about the environmental conditions in the test and measurement, the test and measurement shall be performed in a test room or equipment in the standard condition (test location is temperature 20 ⁇ 5 °C, relative humidity 65% or less). .
  • the present invention can be used for absorbent articles in general having a stretchable structure such as a pants-type disposable diaper as described above, various disposable diapers such as a tape type and a pad type, and a sanitary napkin.
  • a stretchable structure such as a pants-type disposable diaper as described above
  • various disposable diapers such as a tape type and a pad type
  • a sanitary napkin The example of the sanitary napkin is almost the same as the example of FIG.

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Abstract

L'invention concerne un article absorbant qui, par le biais d'une feuille extensible qui présente une partie extensible (83) qui est extensible dans une direction avant-arrière, est pourvu d'un système d'assemblage tridimensionnel (G) formé sur les deux côtés. Dans la partie extensible (83), un film élastique (30) qui est extensible dans au moins la direction avant-arrière est stratifié entre une première couche de feuille (21) qui n'est pas extensible et une seconde couche de feuille (22), la première couche de feuille (21) et la seconde couche de feuille (22) étant reliées, directement ou par le film élastique (30) placé entre elles, au niveau de multiples parties de raccordement (40) présentant des espaces entre elles; la partie extensible (83) se contracte sous l'action d'une force de contraction du film élastique (30) et peut être étirée par application d'une force externe dans la direction avant-arrière, et une contrainte d'étirement dans la direction avant-arrière diffère dans un sens de la largeur du fait que la proportion de la partie de raccordement occupée par la surface totale des portions de raccordement (40) incluses dans une surface unitaire d'une région de la feuille extensible diffère dans le sens de la largeur.
PCT/JP2016/052817 2015-01-30 2016-01-29 Article absorbant présentant une partie extensible WO2016121987A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2015-017498 2015-01-30
JP2015017498A JP5980355B2 (ja) 2015-01-30 2015-01-30 吸収性物品の伸縮構造、及びこれを用いたパンツタイプ使い捨ておむつ
JP2015-195470 2015-09-30
JP2015195470A JP6429757B2 (ja) 2015-09-30 2015-09-30 伸縮部を有する吸収性物品

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0586323U (ja) * 1992-04-23 1993-11-22 株式会社資生堂 生理用ナプキン
JPH08660A (ja) * 1994-06-20 1996-01-09 Uni Charm Corp 個袋入り生理用ナプキン
JP2004532758A (ja) * 2001-06-21 2004-10-28 ザ プロクター アンド ギャンブル カンパニー 弾性のある積層ウェブ
JP2006198132A (ja) * 2005-01-20 2006-08-03 Kao Corp 吸収性物品
JP2008284183A (ja) * 2007-05-18 2008-11-27 Kao Corp 吸収性物品

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0586323U (ja) * 1992-04-23 1993-11-22 株式会社資生堂 生理用ナプキン
JPH08660A (ja) * 1994-06-20 1996-01-09 Uni Charm Corp 個袋入り生理用ナプキン
JP2004532758A (ja) * 2001-06-21 2004-10-28 ザ プロクター アンド ギャンブル カンパニー 弾性のある積層ウェブ
JP2006198132A (ja) * 2005-01-20 2006-08-03 Kao Corp 吸収性物品
JP2008284183A (ja) * 2007-05-18 2008-11-27 Kao Corp 吸収性物品

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