WO2015137128A1 - パンツタイプ使い捨ておむつ - Google Patents
パンツタイプ使い捨ておむつ Download PDFInfo
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- WO2015137128A1 WO2015137128A1 PCT/JP2015/055558 JP2015055558W WO2015137128A1 WO 2015137128 A1 WO2015137128 A1 WO 2015137128A1 JP 2015055558 W JP2015055558 W JP 2015055558W WO 2015137128 A1 WO2015137128 A1 WO 2015137128A1
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- WIPO (PCT)
- Prior art keywords
- elastic
- sheet
- waist
- waist edge
- elastic member
- Prior art date
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Classifications
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- 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 articles specially adapted to be worn around the waist, e.g. diapers
- A61F13/49007—Form-fitting, self-adjusting disposable diapers
- A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
- A61F13/49011—Form-fitting, self-adjusting disposable diapers with elastic means the elastic means is located at the waist region
- A61F13/49012—Form-fitting, self-adjusting disposable diapers with elastic means the elastic means is located at the waist region the elastic means being elastic panels
-
- 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 articles specially adapted to be worn around the waist, e.g. diapers
- A61F13/49007—Form-fitting, self-adjusting disposable diapers
- A61F13/49009—Form-fitting, self-adjusting disposable diapers with elastic means
- A61F13/49011—Form-fitting, self-adjusting disposable diapers with elastic means the elastic means is located at the waist region
-
- 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 articles specially adapted to be worn around the waist, e.g. diapers
- A61F13/49058—Absorbent articles specially adapted to be worn around the waist, e.g. diapers characterised by the modular concept of constructing the diaper
-
- 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 articles specially adapted to be worn around the waist, e.g. diapers
- A61F13/496—Absorbent articles specially adapted to be worn around the waist, e.g. diapers in the form of pants or briefs
-
- 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 articles specially adapted to be worn around the waist, e.g. diapers
- A61F13/496—Absorbent articles specially adapted to be worn around the waist, e.g. diapers in the form of pants or briefs
- A61F13/4963—Absorbent articles specially adapted to be worn around the waist, e.g. diapers in the form of pants or briefs characterized by the seam
-
- 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
- A61F13/51—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 outer layers
- A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
- A61F13/51104—Topsheet, i.e. the permeable cover or layer facing the skin the top sheet having a three-dimensional cross-section, e.g. corrugations, embossments, recesses or projections
- A61F13/51108—Topsheet, i.e. the permeable cover or layer facing the skin the top sheet having a three-dimensional cross-section, e.g. corrugations, embossments, recesses or projections the top sheet having corrugations or embossments having one axis relatively longer than the other axis, e.g. forming channels or grooves in a longitudinal direction
-
- 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
- A61F13/51—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 outer layers
- A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
- A61F13/513—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its function or properties, e.g. stretchability, breathability, rewet, visual effect; having areas of different permeability
- A61F2013/51338—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its function or properties, e.g. stretchability, breathability, rewet, visual effect; having areas of different permeability having improved touch or feeling, e.g. smooth film
Definitions
- the present invention relates to a pants-type disposable diaper having a waist edge that is excellent in breathability and wearing feeling.
- a pants-type disposable diaper includes an exterior body that forms a front body and a back body, and an interior body that includes an absorbent body fixed to the inner surface of the exterior body, and the front body and the back body of the exterior body are on both sides.
- the waist opening and the pair of left and right leg openings are formed by being joined at the portion.
- elongated elastic elastic members such as rubber thread are fixed in a stretched state along the circumferential direction at various locations on the exterior body, Forming a stretchable structure, among them, a waist edge elastic elastic member along the width direction at the edge of the waist opening, and a waist lower part along the width direction at the crotch side than the waist edge elastic elastic member
- a thing provided with an elastic expansion-contraction member has a comparatively high fit with respect to a body, and is used widely.
- Such a stretchable structure is basically composed of a multi-layered exterior body and an elastic stretchable member built in between the layers. Then, hot melt adhesive is applied to one of the outer layer facing the outer side and the inner layer facing the inner side of the elastic expansion / contraction member, the outer layer and the inner layer are joined, and elastic expansion and contraction is applied to the outer layer and the inner layer. In order to reduce costs and improve flexibility by reducing the amount of hot melt adhesive used and the form of fixing the member, hot melt adhesive is applied to the peripheral surface over the entire length of the elastic expansion and contraction member between the outer layer and the inner layer. It is common to sandwich the outer layer and the inner layer and to fix the elastic elastic member to the outer layer and the inner layer.
- a large number of sheet joining portions are obtained by intermittently joining the two sheet materials 12H and 12S in the width direction and the vertical direction perpendicular thereto. 70, and a large number of elongated elastic elastic members 19 are arranged between the sheet materials 12H and 12S so as not to pass through the sheet bonding portion 70 (so as to pass through the non-bonding portions).
- a stretchable structure (see Patent Documents 1 to 3, hereinafter, also referred to as a longitudinal intermittent joining mode) is proposed in which only the portion is fixed to both sheet materials 12H and 12S.
- the portion where the sheet joining portions 70 are aligned in the vertical direction is a groove that is continuous in the vertical direction, and the portion between the grooves becomes a large ridge 80 that bulges on both sides of the front and back sides.
- the heel 80 is excellent in a feeling of warmth.
- this prior art has a heel extending straight, looks good, and has excellent breathability, but when applied to a general waist edge stretch structure in which an elastic stretch member is arranged as close as possible to the edge of the waist opening, Sheet joints will continue in the vertical direction to the edge of the waist opening, and dense shrinkage will continue firmly in the vertical direction to form highly rigid wavy irregularities on the edge of the waist opening. As a result, there is a problem that the feeling of wearing at the waist edge deteriorates.
- JP 2008-295930 A JP 2009-297096 A JP 2009-148447 A JP 2010-22588 A
- the main problem of the present invention is to provide a pants-type disposable diaper having a waist edge that is excellent in breathability and wearing feeling.
- An exterior body constituting the front body and the back body, and an interior body including an absorbent body fixed to the inner surface of the exterior body
- a side seal portion is formed by joining both sides of the outer body of the front body and both sides of the outer body of the rear body, so that the waist portion is formed in an annular shape, and the waist opening and the pair of left and right Leg openings are formed
- a waist edge portion of the exterior body includes a plurality of elongated waist edge elastic elastic members provided along the width direction and spaced apart from each other, and a sheet material facing the inside of the waist edge elastic elastic member.
- a pants-type disposable diaper comprising: an inner layer comprising: and an outer layer comprising a sheet material facing the outside of the waist edge elastic elastic member.
- the inner layer and the outer layer are intermittently arranged in the width direction, joined by an adhesive or welding process continuous in the direction crossing the width direction, and a sheet joint is formed,
- the waist edge elastic elastic member is fixed to at least one of the inner layer and the outer layer at a position intersecting with the sheet joint portion, As the inner elastic layer and the outer layer contract with the contraction of the elastic member at the waist edge, the portions located between the sheet joints in the inner layer and the outer layer swell in opposite directions to form creases, respectively.
- a pants-type disposable diaper characterized by that.
- the waist edge portion of the exterior body has a longitudinal continuous joining form other than the end portion on the waist opening side, the shrinkage ridge formed on the waist edge portion by the shrinkage of the waist edge elastic elastic member, Since an end portion on the side of the waist opening is largely sparse, the air permeability in the vertical direction due to the shrinkage wrinkles is hardly impaired.
- the distance from the edge of the waist opening to the tip of the seat joint on the side of the waist opening is less than 3 mm, or the distance from the edge of the waist opening to the waist edge elastic elastic member located closest to the waist opening If it is less than 5 mm, the rigidity of the wavy irregularities formed at the edge of the waist opening tends to increase.
- the distance from the edge of the waist opening to the tip of the seat joint on the side of the waist opening exceeds 15 mm, there is no change in the effect of improving the feeling of wearing the waist edge, Since the wrinkles formed in the film are likely to be irregular, it is not preferable.
- the distance from the edge of a waist opening part to the waist edge elastic elastic member located in the waist opening part side most exceeds 20 mm, since the fit feeling of a waist edge part falls, it is unpreferable.
- the non-bonded / inelastic elastic member region has a layer structure of three or more layers by folding at least one of the sheet material constituting the inner layer and the sheet material constituting the outer layer at the waist opening.
- the inner layer and the outer layer are each formed by an inner portion and an outer portion of one sheet material folded at the waist opening.
- the sheet joint is formed by the adhesive, Among the portions where the sheet joint portion and the waist edge elastic elastic member intersect, the adhesive is continued in the direction intersecting the width direction on the inner layer side and the outer layer side of the waist edge elastic elastic member.
- the waist edge elastic elastic member is fixed to the inner layer and the outer layer by the adhesive,
- the pants-type disposable diaper according to any one of claims 1 to 4.
- the waist edge elastic elastic member can be firmly fixed by the continuous presence of the adhesive on both the inner layer and the outer layer.
- the interval between adjacent sheet joints affects the height and width of the ridges, and if the interval between adjacent sheet joints is about 2 mm, the continuity in the vertical direction is the same as when continuously joined in the width direction. 3mm, the ridges extend straight in the direction perpendicular to the width direction, but it can be expected that adjacent ridges will support each other. The feeling of fun is not enough.
- the adhesive for forming the sheet joint portion is continuous.
- the inner layer side and the outer layer of the waist edge elastic elastic member In addition to the form in which the adhesive continues in the direction intersecting the width direction on both sides, the adhesive continues on either side because the waist edge elastic elastic member is interposed, but intersects the width direction on the other side A form in which the adhesive is discontinuous in the direction is also included.
- the welding process for forming the sheet bonding portion is continuous, as long as the welding mark is continuous on at least one of the inner layer and the outer layer, the inner layer and the outer layer, the waist edge elastic elastic member, Are welded continuously by the inner layer and the outer layer being indirectly welded, and the waist edge elastic elastic member is formed at the portion where the sheet joint portion and the waist edge elastic elastic member intersect.
- a form in which welding between the inner layer and the outer layer is not continuous due to the interposition is included. If the sheet bonded portion is formed by welding in the longitudinal continuous bonding form, hardening of the welded portion is inevitable, but if the size of the sheet bonded portion is within the above range, the influence of hardening becomes small. Further, as a secondary effect, the transparency of the welded portion is increased, and an appearance in which the glossy welded portion forms a stripe pattern can be obtained.
- the waist edge elastic elastic member is fixed to the sheet at a position where it intersects with the sheet joint portion, and the position where the waist edge elastic elastic member and the sheet joint portion intersect with each other.
- the sheet bonded to the sheet (in addition to bonding with an adhesive, including welding, the same applies hereinafter), but the waist edge elastic elastic member and the sheet are not bonded, but the direction intersecting the width direction.
- the waist edge elastic elastic member is fixed by being sandwiched between the sheet joint portions.
- a mode is also included in which the contraction force of the member is transmitted to the sheet at a position where it intersects with the sheet joint.
- the latter form is, for example, the form described in Japanese Patent Application Laid-Open Nos. 2008-154998 and 2009-106667, and the design positions of the side portions of the elastic member pass through the sheet joint portion. Different from those described.
- interval of adjacent waist edge elastic elastic members shall be 10 mm or less.
- each of the inner layer and the outer layer is a nonwoven fabric having a thickness of 0.1 to 1 mm and a basis weight of 10 to 20 g / m 2 .
- the present invention is particularly suitable for such inner and outer layers.
- the elongation rate means a value when the natural length is 100%.
- Nonwoven fabric is suitable for the inner layer and the outer layer.
- the wrinkles become thin and sharp and easy to collapse, and the compressibility in the thickness direction is poor.
- the basis weight of the nonwoven fabric it is conceivable to increase the basis weight of the nonwoven fabric, but there is a possibility that the softness when touched will be poor even if it looks stiff (because the rigidity is improved too much).
- a non-woven fabric having a higher bending strength in the width direction than the bending strength in the direction perpendicular to the width direction is used for the inner layer and the outer layer, the wrinkles become round and easy to swell and become rich in compression recovery in the thickness direction. At the same time, the heels are less likely to fall down and become softer when touched.
- the cocoon extends straight, looks good, and has excellent breathability, but also has an excellent feeling of fun.
- FIG. 3 is a cross-sectional view taken along the line 3-3 in FIG. 1.
- FIG. 4 is a sectional view taken along line 4-4 of FIG.
- FIG. 5 is a sectional view taken along the line 5-5 in FIG.
- FIG. 1 A) a plan view in an unfolded state, and (b) a 6-6 cross-sectional view in a natural length state, (c) a 6-6 cross-sectional view in a partially extended state, and (d) a 7-7 cross-sectional view showing a stretchable structure
- E It is sectional drawing equivalent to 7-7 cross section of a back
- FIG. 5 is a cross-sectional view corresponding to the 5-5 cross section of FIG. 1.
- A a plan view in an unfolded state, and (b) a 6-6 cross-sectional view in a natural length state, (c) a 6-6 cross-sectional view in a partially extended state, and (d) a 7-7 cross-sectional view showing a stretchable structure It is.
- It is sectional drawing which shows various expansion-contraction structures.
- A a plan view in an unfolded state, and (b) a 6-6 cross-sectional view in a natural length state,
- FIG. 1 It is a top view which shows the principal part of (a) expansion
- FIG. It is a schematic diagram of adhesion equipment. It is a micrograph.
- the pants-type disposable diaper 100 includes an exterior body 12 that forms the outer surface (back surface) of the product, and an interior body 200 that is attached to the inner surface of the exterior body 12.
- Symbol Y indicates the total length of the diaper
- symbol X indicates the total width of the diaper.
- the interior body 200 is a part that absorbs and holds excrement such as urine
- the exterior body 12 is a part that is worn by the wearer.
- the dot pattern part in sectional drawing has shown the junction part which joins each structural member, and is formed by solid, beads, curtains, summits, spiral application, etc., such as a hot-melt-adhesive.
- front-rear direction means the direction connecting the ventral side (front side) and the back side (rear side)
- width direction means the direction (left-right direction) orthogonal to the front-rear direction
- up-down direction In the state of wearing the diaper 100, that is, the direction perpendicular to the waistline direction when the diaper 100 is folded in two at the crotch so that both sides of the front body and the back body of the diaper 100 overlap each other, in other words, For example, it means a direction connecting the waist opening WO side and the crotch side.
- the interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIGS. 3 to 5, the interior body 200 includes a surface sheet 30 on the body side, a liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween. Yes, it is the main body that takes up the absorption function.
- Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50. Shows a three-dimensional gather 60 that stands on the body side and is provided on both sides of the interior body 200 in order to prevent excrement from leaking to both sides of the interior body 200.
- the top sheet 30 has a property of transmitting liquid, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like.
- 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.
- 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.
- spunlace method a spunlace method
- thermal bond method a melt blown method
- melt blown method a melt blown method
- needle punch method an air through method
- point bond method a point bond method.
- the spunbond method and spunlace method are preferable.
- the air-through method, point bond method, and thermal bond method are preferable processing methods. .
- the top sheet 30 may be composed of a single sheet or a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.
- both sides of the top sheet 30 pass between the liquid-impermeable sheet 11 and the three-dimensional gather 60 to the back side of the absorbent element 50 to prevent the liquid from penetrating. It is preferable to adhere to the impermeable sheet 11 and the three-dimensional gather 60 with a hot melt adhesive or the like.
- An intermediate sheet (also referred to as “second sheet”) 40 having a higher liquid permeation rate than the top sheet 30 can be provided to quickly transfer the liquid that has passed through the top sheet 30 to the absorber.
- This intermediate sheet 40 not only improves the absorption performance of the absorbent by quickly transferring the liquid to the absorbent body, but also prevents the “reversed” phenomenon of the absorbed liquid from the absorbent body, so that the top sheet 30 is always dried. It can be made into the state which carried out.
- the intermediate sheet 40 can be omitted.
- the intermediate sheet 40 examples include the same material as the top sheet 30, spunlace, spunbond, SMS, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper.
- an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven fabric.
- the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable.
- Basis weight is preferably 20 ⁇ 80g / m 2, more preferably 25 ⁇ 60g / m 2.
- the thickness of the raw fiber of the nonwoven fabric is preferably 2.2 to 10 dtex.
- the intermediate sheet 40 in the illustrated form is arranged in the center shorter than the width of the absorbent body 56, but may be provided over the entire width.
- the length of the intermediate sheet 40 in the longitudinal direction may be the same as the length of the absorbent body 56 or may be within a short length range centered on the region that receives the liquid.
- the material of the liquid-impermeable sheet 11 is not particularly limited.
- a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric provided with a plastic film on the surface of the nonwoven fabric, or a plastic film For example, a laminated sheet in which a nonwoven fabric or the like is laminated and bonded to each other can be exemplified.
- the liquid-impermeable sheet 11 it is preferable to use a liquid-impervious and moisture-permeable material that has been preferred in recent years from the viewpoint of preventing stuffiness.
- a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction.
- an olefin resin such as polyethylene or polypropylene
- non-woven fabric using microdenier fiber enhancement of leakproofness by reducing the voids of the fiber by applying heat or pressure, application of superabsorbent resin or hydrophobic resin or water repellent
- a sheet that is liquid-impermeable without using a plastic film can also be used as the liquid-impermeable sheet 11.
- the liquid-impermeable sheet 11 is preferably extended to both sides of the side surface 30 of the absorbent element 50 by wrapping around both sides of the absorbent element 50 in order to improve leakage prevention.
- the width of this extended portion is suitably about 5 to 20 mm on the left and right.
- an excretion indicator whose color is changed by absorption of the liquid component can be provided on the inner side of the liquid-impermeable sheet 11, particularly on the side of the absorber 56.
- the three-dimensional gather 60 is a belt-like member that extends over the entire front-rear direction along both side portions of the interior body 200, blocks urine and soft stool that move in the lateral direction along the top sheet 30, and prevents side leakage. It is provided for this purpose.
- the three-dimensional gather 60 of the present embodiment is provided so as to stand up from the side portion of the interior body 200, the base side portion rises obliquely toward the center in the width direction, and the tip side portion from the intermediate portion has a width. It stands up diagonally outward in the direction.
- the three-dimensional gather 60 folds the belt-shaped gather sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 in the width direction and folds it into two.
- a plurality of elongated elastic elastic members 63 are fixed along the longitudinal direction at intervals in the width direction.
- An end portion of the three-dimensional gather 60 opposite to the folded portion in the width direction is an attachment portion 65 fixed to the back surface of the side edge portion of the interior body 200, and portions other than the attachment portion 65 protrude from the attachment portion 65. It is set as the protrusion part 66 (part by the side of a folding
- both end portions in the front-rear direction of the protruding portion 66 extend from the mounting portion 65 to the side surface of the topsheet 30 through the side portion of the interior body 200 and are hot-melted to the side surface of the topsheet 30.
- the base side portion is fixed to the front and rear fixing portion 67 by an adhesive or heat seal, and the tip side portion is folded back outward in the width direction from the tip of the base side portion and fixed to the base side portion.
- An intermediate part in the front-rear direction of the protruding part is an unfixed free part (inner free part), and an elongated elastic member 63 extending in the front-rear direction is fixed to the free part in an extended state.
- the gather sheet 62 is made of a spunbond nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), a melt-blown nonwoven fabric with excellent uniformity and concealment, and water repellent with silicon as necessary.
- a treated product can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m 2 .
- the elongated elastic elastic member 63 rubber thread or the like can be used. When spandex yarn rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex.
- the elongation at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%.
- the term “elongation rate” means a value when the natural length is 100%.
- a waterproof film 64 can be interposed between the gather sheets folded in two.
- the number of the elongated elastic elastic members 63 provided in the free part of the three-dimensional gather 60 is preferably 2 to 6, and more preferably 3 to 5.
- the arrangement interval 60d is suitably 3 to 10 mm. If comprised in this way, in the range which has arrange
- the elongated elastic elastic member 63 may be disposed not only at the distal end side but also at the base side.
- the fixing target of the attachment portion 65 of the three-dimensional gather 60 can be an appropriate member such as the top sheet 30, the liquid-impermeable sheet 11, the absorbent element 50 in the interior body 200.
- the contraction force of the elongated elastic elastic member 63 acts so that both ends in the front-rear direction are brought close to each other, but the both ends in the front-rear direction of the protruding portion 66 are fixed so as not to stand up.
- the free portions stand up against the body side as shown in FIG.
- the attachment portion 65 is positioned on the back surface side of the interior body 200, the three-dimensional gather 60 stands up so as to open outward in the width direction at the crotch portion and in the vicinity thereof. It comes in contact, and the fit is improved.
- the dimensions of the three-dimensional gather 60 can be determined as appropriate.
- the standing height of the three-dimensional gather 60 (the length in the width direction of the protruding portion 66 in the unfolded state) 66w is It is preferably 15 to 60 mm, particularly 20 to 40 mm.
- the separation distance 60d between the innermost folds is preferably 60 to 190 mm, particularly preferably 70 to 140 mm.
- double (two rows) of three-dimensional gathers can be provided on the left and right sides of the interior body 200.
- the absorbent element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps the entire absorbent body 56.
- the packaging sheet 58 can be omitted.
- the absorber 56 can be formed of an aggregate of fibers.
- This fiber assembly a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used.
- the fiber basis weight can be, for example, about 100 to 300 g / m 2 when stacking cotton-like pulp or short fibers, and about 30 to 120 g / m 2 for filament aggregates, for example. Can do.
- the fineness in the case of synthetic fibers is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex.
- the filament may be a non-crimped fiber, but is preferably a crimped fiber.
- the crimped degree of the crimped fiber can be, for example, about 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.
- the absorber 56 may have a rectangular shape, but as shown in FIG. 1, as shown in FIG. 1, the hourglass has a front end portion, a rear end portion, and a narrow portion narrower than the front end portion and the rear end portion.
- the shape is preferable because the fit of the absorber 56 itself and the three-dimensional gather 60 around the legs is improved.
- the size of the absorber can be determined as appropriate, but it preferably extends to the peripheral edge of the interior body or the vicinity thereof in the front-rear direction and the width direction.
- Reference numeral 56X indicates the width of the absorber 56.
- the absorber 56 can contain superabsorbent polymer particles in a part or all thereof.
- Superabsorbent polymer particles include “powder” in addition to “particles”.
- particle diameter of the superabsorbent polymer particles those used in this type of absorbent article can be used as they are, and those having a particle size of 1000 ⁇ m or less, particularly 150 to 400 ⁇ m are desirable.
- the material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable.
- Superabsorbent polymer particles include starch, cellulose and synthetic polymers, such as starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and sodium carboxymethylcellulose cross-link. Or an acrylic acid (salt) polymer can be used.
- starch-acrylic acid (salt) graft copolymer such as starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and sodium carboxymethylcellulose cross-link.
- an acrylic acid (salt) polymer can be used.
- shape of the superabsorbent polymer particles a commonly used granular material is suitable, but other shapes can also be used.
- the superabsorbent polymer particles those having a water absorption rate of 40 seconds or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversion in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur.
- the superabsorbent polymer particles those having a gel strength of 1000 Pa or more are preferably used. Thereby, even if it is a case where it is set as the bulky absorber 56, the sticky feeling after liquid absorption can be suppressed effectively.
- the basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be generally stated, it can be 50 to 350 g / m 2 . If the amount of polymer is less than 50 g / m 2, it is difficult to secure the absorption amount. When it exceeds 350 g / m 2 , the effect is saturated.
- the superabsorbent polymer particles can adjust the spray density or spray amount in the plane direction of the absorber 56. For example, it is possible to increase the application amount of the liquid excretion site as compared to other sites. When gender differences are taken into account, men can increase the front spray density (amount), while women can increase the center spray density (amount). In addition, a portion where no polymer exists locally (for example, in a spot shape) in the planar direction of the absorber 56 can also be provided.
- tissue paper particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used.
- the superabsorbent polymer particles be a sheet that does not escape.
- a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material can be polypropylene, polyethylene / polypropylene composite material, or the like.
- the basis weight is preferably 5 to 40 g / m 2 , particularly 10 to 30 g / m 2 .
- the packaging form of the packaging sheet 58 can be determined as appropriate, but from the viewpoint of ease of manufacture and prevention of leakage of the superabsorbent polymer particles from the front and rear end edges, the cylinder is formed so as to surround the front and back surfaces and both side surfaces of the absorbent body 56. It is preferable that the front and rear edges of the absorbent body 56 are protruded from the front and back of the absorbent body 56, and the protruding portions are crushed in the front and back directions and joined by a joining means such as a hot melt adhesive.
- the exterior body 12 has a part constituting a front body F extending from the crotch part to the abdomen and a part constituting a rear body B extending from the crotch part to the back side, and both sides of the front body F As shown in FIG. 8, a waist opening WO for passing the wearer's torso and a pair of left and right leg openings LO for passing the legs are formed. It is what.
- Reference numeral 12A denotes a joining portion (hereinafter, this portion is also referred to as a side seal portion).
- the crotch portion means the center in the front-rear direction from the waist edge of the front body F to the waist edge of the back body B in the unfolded state, and the front side part and the back side part thereof are the front body F and the back body part.
- B means each.
- the exterior body 12 includes a waist portion T defined as a front-rear direction range extending from the waist opening WO to the upper end of the leg opening LO, and a front-rear direction range of a portion forming the leg opening LO (a side seal portion 12A of the front body F). And an intermediate portion L defined as a front / rear direction region having the side seal portion 12A of the back body B.
- the waistline portion T can be divided into a waist edge W that conceptually forms the edge of the waist opening and a waist lower portion U that is a portion below the waist edge W.
- the waist opening WO side is closer to the waist opening WO side boundary.
- the waist opening WO side becomes the waist edge W from the absorbent body 56 or the interior body 200.
- the length in the vertical direction varies depending on the size of the product and can be determined as appropriate.
- the waist edge W may be 15 to 40 mm
- the waist lower portion U may be 65 to 120 mm.
- both side edges of the intermediate portion L are bundled along the circumference of the wearer's leg, and this is a portion into which the wearer's leg is put.
- the exterior body 12 has a substantially hourglass shape as a whole.
- the degree of tightness of the exterior body 12 can be determined as appropriate.
- the narrowest portion may be narrower than the width of the interior body 200 in order to obtain a clean appearance.
- the narrowest part may be determined so as to be equal to or larger than the width of the interior body 200.
- the exterior body 12 is formed by joining two sheet materials 12S and 12H, and the first sheet material 12S located outside is formed at the edge of the waist opening WO.
- the folded portion 12r extends inward so as to cover the end of the interior body 200 on the waist side.
- the second sheet material 12 ⁇ / b> H located on the inner side extends to the end on the waist opening WO side in the front body F, but in the rear body B, the second sheet material 12 ⁇ / b> H
- the two-sheet material 12H has a structure that extends only to a position below the front end (front and rear center side), but the layer structure of the front body F and the layer structure of the back body B are either one of the layers. It can be unified into the structure or vice versa.
- the sheet materials 12S and 12H can be used without particular limitation as long as they are in sheet form, but are preferably non-woven fabrics.
- 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. Examples of the processing method 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.
- an elongated elastic elastic member such as rubber thread between the inner layer 21 and the outer layer 22 formed by at least one of the sheet materials 12S and 12H. 19 (a waist edge elastic elastic member 17, a waist lower elastic elastic member 15, and an intermediate elastic elastic member 16 described later) are provided at a predetermined elongation rate.
- the elongated elastic elastic member 19 synthetic rubber or natural rubber may be used.
- the outer edge layer 22 is formed of the first sheet material 12 ⁇ / b> S in the waist edge portion of the outer body 12 of the front body F as shown in FIG. As shown in FIG.
- the outer edge 22 of the diaper in the first sheet material 12S is formed on the waist edge of the outer body 12 of the back body B, which is formed of the second sheet material 12H.
- the inner layer 21 is formed by a portion folded inside the first sheet material 12S. In other parts, the outer layer 22 is formed of the first sheet material 12S and the inner layer 21 is formed of the second sheet material 12H.
- a plurality of waist edge elastic elastic members 17 are vertically spaced and predetermined so as to be continuous over the entire width direction. It is being fixed in the state extended
- one or more of the waist edge elastic elastic members 17 disposed in a region adjacent to the waist lower portion U may overlap with the interior body 200 or may be overlapped with the interior body 200 in the width direction. You may each provide in the width direction both sides except a center part.
- the waist edge elastic elastic member 17 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber.
- the cross-sectional area is 0.05 to 1.5 mm 2 , particularly 0.1 to It is preferable to fix the thread rubber of about 1.0 mm 2 ) at an interval of 4 to 12 mm at about 3 to 22 pieces and an elongation of 150 to 400%, particularly about 220 to 320%.
- the waist edge elastic elastic members 17 need not all have the same thickness and elongation rate.
- the elastic elastic members may have different thicknesses and elongation rates at the upper and lower portions of the waist edge W. .
- the width is provided at each part on the upper side and both sides in the width direction except for the center portion in the width direction that overlaps the interior body 200.
- a plurality of waist lower elastic expansion / contraction members 15 made of an elongated elastic expansion / contraction member are fixed so as to be continuous over the entire direction, spaced apart in the vertical direction and extended along the width direction at a predetermined expansion rate. Has been.
- the waist lower elastic elastic member 15 has a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber.
- the cross-sectional area is 0.05 to 1.5 mm 2 , particularly 0.1 to 1. It is preferable to fix the thread rubber of about 0 mm 2 ) at an interval of 1 to 15 mm, particularly 3 to 8 mm, and about 5 to 30, and an elongation rate of 200 to 350%, particularly 240 to 300%.
- the entire width direction is provided at each part on both sides in the width direction.
- a plurality of intermediate elastic elastic members 16 made of an elongated elastic elastic member are fixed in a state where they are extended in the width direction at a predetermined extension rate with a space in the vertical direction. Yes.
- the intermediate elastic member 16 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber.
- the cross-sectional area is 0.05 to 1.5 mm 2 , particularly 0.1 to 1. It is preferable to fix the thread rubber of about 0 mm 2 at 5 to 40 mm, particularly about 2 to 10 at intervals of 5 to 20 mm, with an elongation of 150 to 300%, particularly 180 to 260%, respectively.
- the waist lower elastic elastic member 15 and the intermediate elastic elastic member 16 are overlapped with the interior body 200 in the width direction central portion (both the region having the same width as the interior body 200 or a part of the region). If it is respectively provided on both sides in the width direction except for (including), the interior body 200 will not shrink more than necessary in the width direction, and it will not look like Mokomoko or the absorbability will not decrease.
- the elastic stretchable member exists from one side of the width direction to the other side across the interior body 200, but overlaps the interior body 200.
- the elastic expansion / contraction member is finely cut, and the contraction force does not act (substantially equivalent to not providing the elastic expansion / contraction member), and only the both sides in the width direction are configured as the contraction force acting portions.
- the disposition form of the waist lower elastic elastic member 15 and the intermediate elastic elastic member 16 is not limited to the above example, and the waist lower elastic elastic member 15 and the waist lower elastic elastic member 15 so that the elastic force acts over the entire width direction of the waist lower U.
- a part or all of the intermediate elastic elastic member 16 may be provided from one side in the width direction to the other side across the interior body 200.
- the exterior body 12 can be entirely formed by folding back and forth both sides of one sheet material 12 ⁇ / b> S. Moreover, in the above-mentioned example, the front body F to the back body B are continuously covered with the integral exterior body 12, but the abdominal exterior body and the back exterior body are continuously located on the crotch side. In this case, the crotch covering the portion of the outer surface of the interior body that is exposed between the exterior body on the abdominal side and the exterior body on the back side. A part exterior body can also be affixed. As the crotch outer casing, the same materials as those used for the outer casing described above can be used.
- the inner layer and the outer layer of each exterior body are formed by the first sheet material and the second sheet material following the form shown in FIG. It is also possible to form the sheet material by folding it in half on the waist opening side or so-called C-folding.
- the sheet joining portion 70 is formed by joining with an adhesive 71 (hot melt adhesive or the like) continuous in a predetermined width in a direction intersecting (orthogonal in the illustrated form).
- the width dimension 70w of each sheet joint 70 is preferably 0.5 to 4 mm, and the interval 70d between adjacent sheet joints 70 is preferably 4 to 8 mm (preferably 5 to 7 mm). .
- the lower limit of the dimension 70w in the width direction of the sheet joining portion 70 is preferably 1 mm from the viewpoint of manufacturability, but is preferably 0.5 mm from the viewpoint of flexibility.
- the upper limit of the dimension 70w in the width direction of the sheet joining portion 70 is preferably 2 mm, and more preferably 1.5 mm.
- the material of the first sheet material 12S and the second sheet material 12H is not particularly limited, but is preferably a nonwoven fabric having a thickness of 0.1 to 1 mm and a basis weight of 10 to 20 g / m 2 , respectively.
- the 1st sheet material 12S and the 2nd sheet material 12H are each comprised from the nonwoven fabric of one sheet, and either or both may be a laminated body of the nonwoven fabric of several sheets.
- the non-woven fabric is preferably flexible, and at least one of the first sheet material 12S and the second sheet material 12H is a non-woven fabric of polypropylene (PP) or a copolymer thereof (for example, a copolymer in which polyethylene or ethylene is blended as a copolymerization component).
- PP polypropylene
- flexible nonwoven fabrics such as a nonwoven fabric of core-sheath fibers (PE / PP) having polyethylene (PE) as a sheath and polypropylene (PP) as a core component are particularly suitable.
- the type of the nonwoven fabric is not particularly limited, but a spunbond nonwoven fabric is preferable from the point of excellent strength and flexibility, and in particular, a spunbond nonwoven fabric formed by laminating a plurality of spunbond layers, for example, SS nonwoven fabric (two layers), An SSS nonwoven fabric (three layers) can be suitably used, and four or more layers can also be used.
- SS nonwoven fabric two layers
- SSS nonwoven fabric three layers
- four or more layers can also be used.
- the elastic elastic members 15 to 17 are fixed to at least one of the inner layer 21 and the outer layer 22 by an adhesive 71 at a position intersecting with the sheet bonding portion 70.
- an adhesive different from that for forming the sheet bonding portion can be applied to the elastic elastic members or the inner layer 21 and the outer layer 22. Since the adhesive 71 for forming the belt is continuous in the direction intersecting the width direction, the elastic elastic members 15 to 17 are fixed to at least one of the inner layer 21 and the outer layer 22 by using the adhesive 71. ing. In manufacturing, the adhesive 71 is applied to one or both of the inner layer 21 and the outer layer 22, and the elastic members 15 to 17 are bonded to the inner layer 21 and the outer layer 22 when the inner layer 21 and the outer layer 22 are joined. You just put between.
- the adhesive 71 is applied to the inner surface of the outer layer 22 intermittently in the width direction and continuously with a predetermined width in the direction intersecting the width direction.
- the elastic elastic members 15 to 17 are sandwiched between the inner layer 21 and the outer layer 22 without applying the adhesive 71, and the inner layer 21, the outer layer 22, and the elastic elastic member 15 are sandwiched. ⁇ 17 are joined by an adhesive 71, respectively.
- the adhesive 71 continues outside the elastic elastic members 15 to 17 in the direction intersecting the width direction, whereby the elastic elastic member 15 17 are fixed to the outer layer 22, and the adhesive 71 is discontinuous in the direction intersecting the width direction inside the elastic elastic members 15-17.
- this discontinuous portion is indicated by reference numeral 72. Since the adhesive 71 is intermittently present in the inner layer 21, a decrease in flexibility of the inner layer 21, and thus a decrease in flexibility of the exterior body 12 as a whole can be suppressed.
- the elastic elastic members 15 to 17 are continuous with the adhesive 71 only at the outer side at the portion intersecting with the sheet joining portion 70, the longitudinal layers of the elastic elastic members 15 to 17 are formed on the inner layer 21 and the outer side by the sheet joining portion 70. Since the layer 22 is integrated, the contraction force of the elastic members 15 to 17 acts on the inner layer 21 and the outer layer 22 in the same manner, so that uniform wrinkles are formed on both the inner layer 21 and the outer layer 22. Can do.
- the adhesive 71 can be applied to both the inner layer 21 and the outer layer 22 in the same pattern.
- the adhesive 71 crosses the width direction both inside and outside the elastic expansion / contraction members 15 to 17 in the portion where the sheet joining portion 70 and the elastic expansion / contraction members 15 to 17 intersect. Since the elastic stretchable members 15 to 17 are more firmly fixed, the elastic stretchable members 15 to 17 have an advantage in that they are continuous in a predetermined width.
- the inner layer 21 and the outer layer 22 are composed of a portion positioned on the inner side and a portion positioned on the outer side in one sheet material 12 ⁇ / b> S folded at the waist opening WO.
- the sheet material 12S can be manufactured by simply folding the sheet material 12S in the middle of the continuous direction of the adhesive 71 or so-called C-folding.
- the adhesive 71 is applied to the single sheet material 12S in the form of vertical stripes, the sheet material 12S can be manufactured by simply folding the sheet material 12S in the middle of the continuous direction of the adhesive 71 or so-called C-folding.
- the adhesive 71 is continuous in the inner layer 21, not only the flexibility of the second sheet material 12H itself to be brought into contact with the skin is lowered, but also the portion where the flexibility is lowered is the elastic elastic member 15 ⁇ . 17 is not preferable in that respect because it is pressed against the skin.
- a hot melt adhesive is suitably used as the adhesive 71 for forming the sheet bonding portion 70.
- hot melt adhesives such as EVA, adhesive rubber (elastomer), olefin, polyester / polyamide, and can be used without particular limitation. It is desirable to use it.
- the application method of the hot melt adhesive is not particularly limited. However, when the dimension in the width direction of the sheet joining portion 70 is narrow, for example, 1 mm or less, the application width of the hot melt adhesive becomes narrow, and the curtain or solid Thus, it is difficult to apply by intermittent application by an application method in which spraying is performed from a nozzle. Therefore, it is desirable to employ a pattern coat suitable for narrow width application (transfer of hot melt adhesive 71 by letterpress method).
- FIG. 19 shows an example of a production facility for a stretchable structure when a pattern coat of hot melt adhesive is used.
- this example of the pattern coat type equipment includes elastic stretch members 15 to 17 between the second sheet material 12H and the first sheet material 12S in which the hot melt adhesive 71 is applied to the surface on the second sheet material 12H side. 6 is fed between a pair of nip rolls 101 and pressed to form the stretchable structure shown in FIG. Before the first sheet material 12S is fed to the nip roll 101, the first sheet material 12S is brought into contact with the plate roll 102 having an intermittent convex pattern in the circumferential direction, and intermittently in the transport direction (MD direction, which is the width direction). In addition, the hot melt adhesive 71 is transferred and applied continuously in a direction (CD direction) intersecting the transport direction.
- CD direction a direction
- Reference numeral 103 denotes a hot melt adhesive supply roll (anilox roll in letterpress printing) for transferring and applying the hot melt adhesive 71 to the convex pattern of the plate roll 102 at a predetermined thickness
- reference numeral 104 denotes hot melt adhesion.
- the supply nozzle which supplies the hot-melt-adhesive 71 to the agent supply roll 103 is shown.
- the hot melt adhesive 71 may be stringed, and the application width (that is, the width of the sheet bonding portion 70). ) May decrease in accuracy and operational stability. Therefore, it is desirable to use a hot melt adhesive 71 having a melt viscosity at a temperature of 140 ° C. of 10,000 mpa or less, a melt viscosity at a temperature of 160 ° C. of 5000 mpas or less, and a loop tack adhesive strength of 2000 g / 25 mm or more. Thereby, the possibility of stringing is reduced, and the application width accuracy and operational stability can be improved.
- the loop tack adhesive strength of the hot melt adhesive 71 means a value measured as follows. That is, the hot melt adhesive 71 is applied on a 50 ⁇ m thick PET plate to a thickness of 50 ⁇ m. This is cut into a size of 25 mm in width and 125 mm in length to form a tape, and then the two ends of the tape are overlapped to form a loop. This loop is fixed to an LT-100 type loop tack tester (manufactured by Chem Instrument Co., Ltd.) and then bonded to a PE (polyethylene) plate with an adhesive area of 25 mm ⁇ 25 mm and an adhesive time of 2 seconds. Next, the loop-shaped tape is peeled off at 20 ° C.
- melt viscosity of the hot melt adhesive 71 is measured at a specified temperature using a Brookfield B-type viscometer (spindle No. 027) in accordance with JIS Z 8803.
- seat junction part 70 can also be formed by a welding process.
- the welded portion is indicated by reference numeral 75.
- a known processing method such as heat sealing or ultrasonic welding can be employed.
- the welding process for forming the sheet bonding portion 70 is continuous. As long as the welding traces of at least one of the inner layer 21 and the outer layer 22 are continuous, the inner layer 21, the outer layer 22, and the elastic elastic member 15. To 17 and the inner layer 21 and the outer layer 22 are indirectly welded, so that the welding is continued, and at the portion 72 where the sheet joining portion 70 and the elastic elastic members 15 to 17 intersect.
- a mode in which welding between the inner layer 21 and the outer layer 22 is not continuous due to the presence of the elastic elastic members 15 to 17 is also included.
- welding is performed in a continuous pattern across the elastic elastic members 15 to 17 by heat sealing or ultrasonic welding, and the elastic elastic members If the inner layer 21 and the outer layer 22 are melted without melting 15 to 17, the inner layer 21 and the outer layer 22 and the elastic elastic members 15 to 17 are not welded, so that the latter form is obtained.
- the elastic elastic members 15 to 17 are fixed to at least one of the inner layer 21 and the outer layer 22 at a position intersecting with the sheet joint portion 70.
- the elastic elastic members 15 to 17 and the sheet are bonded to each other at a position where the elastic elastic members 15 to 17 and the sheet joint portion 70 intersect (only by bonding with an adhesive 71 such as a hot melt adhesive).
- the elastic elastic members 15 to 17 and the sheet are not bonded to each other, but the interval between the sheet joint portions 70 in the direction intersecting the width direction is not limited to the elastic elastic members 15 to 17.
- the elastic elastic members 15 to 17 are fixed by being sandwiched between the sheet joining portions 70, so that the contraction force of the elastic elastic members 15 to 17 intersects with the sheet joining portion 70.
- the sheet bonding portion 70 is welded in a continuous pattern across the elastic elastic member 19 by heat sealing or ultrasonic welding, and the inner layer 21 and the outer layer 22 are melted without melting the elastic elastic member 19, Without welding the layer 21 and the outer layer 22 and the elastic elastic member 19, the tension of the elastic elastic member 19 is then released and the elastic elastic member 19 is contracted as shown in FIG. It can be manufactured by enlarging and sandwiching the elastic elastic member 19 between the sheet joining portions 70.
- the manufactured stretchable structure is elastically stretchable at the portion where the sheet joining portion 70 and the elastic stretchable member 19 intersect, although the welding traces of at least one of the first sheet material 12S and the second sheet material 12H are continuous. Since the member 19 is interposed, the welding between the inner layer 21 and the outer layer 22 is not continuous, and the elastic elastic member 19 is fixed by being sandwiched between the sheet joining portions 70.
- the welded portion 75 cannot be hardened, but if the size of the sheet joint portion 70 is within the above range, the effect of the hardening is small. Further, as a secondary effect, it is possible to increase the transparency of the welded portion 75 and obtain an appearance in which the glossy welded portion 75 forms a stripe pattern.
- the distance 19d between the elastic elastic members 19 adjacent to each other can be determined as appropriate. However, if the distance exceeds 10 mm, the thickness of the flange 80 changes in the direction intersecting the width direction, although it is not as long as the longitudinal intermittent joining form. Therefore, in the present invention, the distance 19d between the elastic elastic members 19 adjacent to each other is preferably 10 mm or less, particularly 3 to 7 mm.
- the thickness and elongation rate of the elastic elastic member 19 may be appropriately selected according to the mounting position of the elastic elastic member 19, and the preferred range is as described above. is there. In general, it is desirable that the elastic elastic member 19 has a thickness of about 300 to 1,000 dtex and an elongation rate of about 200 to 350%.
- FIG. 6 (b) shows a natural length state, but the elastic elastic members 15 to 17 are extended from this state to a certain extent when worn, and the skirt of the heel 80 is widened as shown in FIG. 6 (c).
- the height 80h of the ridge 80 is lowered.
- this stretchable structure is in the form of continuous joining in the vertical direction, a flange 80 that extends straight along the sheet joining portion 70 is formed, and is excellent in air permeability and appearance.
- each sheet joint portion 70 affects the interval between the adjacent ridges 80.
- the width 70w is 4 mm. If it exceeds, the space between the adjacent ridges 80 becomes too wide, and not only the individual ridges 80 look independent, but also when the ridges 80 are crushed and deformed by the compressive force in the thickness direction, they are adjacent to each other. As a result of weakening the function of supporting the heel 80, the resistance to deformation or the restoration after the change becomes weak, and as a result, the feeling of fun is insufficient.
- the interval 70d between the adjacent sheet bonding portions 70 affects the height 80h and the width of the flange 80, and when the interval 70d between the adjacent sheet bonding portions 70 is about 2 mm, It becomes the same ridge 80 having poor continuity in the longitudinal direction (the meaning of providing the sheet joint portion 70 intermittently in the width direction is lost), but at 3 mm, the ridge 80 extends straight in a direction orthogonal to the width direction. The effect that the adjacent ridges 80 support each other cannot be expected, and the sense of fun is insufficient.
- the collar 80 will be crushed irregularly by compression at the time of packaging, and the appearance of a product will worsen.
- the dimension 70w in the width direction of the sheet joining portion 70 is 0.5 to 4 mm and the interval 70d of the sheet joining portion 70 is 4 to 8 mm.
- the bag 80 is not easily crushed irregularly due to compression during packaging. Therefore, even if a particularly flexible nonwoven fabric is used for at least one of the first sheet material and the second sheet material, the ridge 80 is difficult to be thinned, hardly collapsed, and rich in compression and restoration properties.
- the inner layer 21 and the outer layer 22 are preferably non-woven fabrics.
- the wrinkles 80 become thin and sharp and easy to collapse, and the compression in the thickness direction is restored. Sexuality also becomes poor.
- it is conceivable to increase the basis weight of the nonwoven fabric but there is a possibility that the softness when touched will be poor even if it looks stiff (because the rigidity is improved too much). Therefore, it is also proposed to use a nonwoven fabric as the inner layer 21 and the outer layer 22 so that the bending resistance in the width direction is higher than the bending resistance in the direction perpendicular to the width direction.
- Each of the inner layer 21 and the outer layer 22 has a bending resistance in the width direction of preferably 30 to 75 mm, more preferably 40 to 55 mm, and the bending resistance in the direction perpendicular to the width direction is less than the bending resistance in the width direction. Within this range, it is preferably 20 to 50 mm, more preferably 25 to 35 mm.
- the bending resistance of the nonwoven fabric means a value measured in accordance with the bending resistance A method (45-degree cantilever method) of JIS L1096: 2010 “Fabric and knitted fabric testing method”.
- the fiber orientation of the nonwoven fabric may be configured along the width direction.
- the fiber orientation is the direction along which the fibers of the nonwoven fabric are along, and “the fiber orientation is along the width direction” means that 100% of the total fiber weight constituting the nonwoven fabric is fiber-oriented in the width direction. From 50% to 50% or more, the fiber orientation is in the range of ⁇ 45 ° to + 45 ° with respect to the width direction.
- the measurement method generally used can be used for the measuring method of the fiber orientation of a nonwoven fabric.
- measurement methods include a measurement method according to the TAPPI standard method T481 fiber orientation test method using zero-range tensile strength, and a simple measurement that determines the fiber orientation direction from the tensile strength ratio in the width direction and its orthogonal direction.
- TAPPI standard method T481 fiber orientation test method using zero-range tensile strength and a simple measurement that determines the fiber orientation direction from the tensile strength ratio in the width direction and its orthogonal direction.
- a method can be mentioned.
- a test piece having a length of 200 mm and a width of 50 mm is subjected to a tensile test using a tensile tester under the conditions of a crosshead speed of 500 mm / min and a distance between chucks of 150 mm. If the tensile strength is obtained from the maximum load and the ratio of tensile strength (width direction / orthogonal direction) is greater than 1, the fiber orientation is assumed to be along the width direction.
- the sheet joining portion 70 becomes intermittent in the width direction, a decrease in the fixing force of the elastic stretchable members 15 to 17 is unavoidable, and the elastic stretchable members 15 to 17 may come off.
- the dimension 70w in the width direction of each sheet joint portion 70 is narrow. In this case, the position where the elastic stretch members 15 to 17 and the sheet joint portion 70 intersect becomes small, and the elastic stretch member at this small position. It is necessary to fix 15 to 17, and it is important to secure the fixing force of the elastic elastic members 15 to 17.
- regions on both sides in the width direction of the interior body 200 in the exterior body 12 are defined as an end region on the interior body 200 side, an end region on the side seal portion 12A side, When divided into intermediate regions located between them, the distances Di and Ds between the sheet bonding portions 70 in the end region on the inner body 200 side and the end region on the side seal portion 12A side are set between the sheet bonding portions 70 in the intermediate region. It is desirable to make it narrower than the distance Dm.
- the elasticity in the end region on the inner body 200 side and the end region on the side seal portion 12A side is shown.
- the fixed widths Wi and Ws of the elastic members 15 to 17 are wider than the fixed width Wm of the elastic elastic member in the intermediate region. is there.
- the elastic stretch members 15 to 17 of the exterior body 12 of the pants-type disposable diaper are firmly fixed at the side seal portion 12A at the outer ends in the width direction. It is also a preferable form that the fixing strengthening means is omitted.
- Non-bonded / Non-elastic elastic member area Characteristically, as shown in FIGS. 5 and 6 and FIGS. 11 to 14, at the end of the waist edge W of the exterior body 12 on the side of the waist opening WO, the sheet joint portion 70 and the waist edge portion. There is no elastic elastic member 17 and the longitudinal range is wider than the interval 17d between the waist edge elastic elastic member 17 located closest to the waist opening WO and the waist edge elastic elastic member 17 adjacent thereto, A non-joining / non-elastic elastic member region 25 is provided. In the illustrated embodiment, both the front body F and the back body B are provided with the non-joining / inelastic elastic member region 25, but only one of them may be used.
- FIG. 16 (a) and FIG. 17 (a) As described above, when the non-joint / non-elastic stretchable member region 25 is secured widely in the waist edge W while adopting the longitudinal continuous joining form in the waist edge W, FIG. 16 (a) and FIG. 17 (a).
- the end portion (non-bonding / non-elastic elastic member region 25) on the waist opening WO side has no hard sheet bonding portion 70 and the waist edge.
- the shrinkage wrinkles are larger and sparser and more flexible than the region having the elastic elastic members 17, and the unevenness of the edge WOE of the waist opening WO is also largely sparse and flexible, and the feeling of wearing the waist edge W is good. .
- the waist edge W of the exterior body 12 becomes a vertical direction continuous joining form except the edge part by the side of the waist opening WO, it is formed in the waist edge W by shrinkage
- FIG. Since the shrinkage wrinkles are formed to be largely sparse at the end on the waist opening WO side, the air permeability in the vertical direction due to the shrinkage wrinkles is hardly impaired.
- the vertical continuous joining form is adopted in the conventional pants-type disposable diaper, as can be seen from the photographs of the partial samples of the waist edge W shown in FIGS.
- the longitudinal dimension of the non-bonded / inelastic elastic member region 25 may be determined as appropriate, but as shown in FIGS. 6A, 12A and 14A, the edge of the waist opening WO
- the distance 26 from the WOE to the tip of the sheet joint portion 70 on the waist opening WO side is preferably 3 to 15 mm.
- the distance 27 from the edge of the waist opening WO to the waist edge elastic elastic member 17 located closest to the waist opening WO is preferably 5 to 20 mm.
- the distance 26 from the edge WOE of the waist opening WO to the tip of the seat opening 70 on the side of the waist opening WO is the most from the edge of the waist opening WO because the elastic elastic member at the waist edge is fixed at the sheet joint.
- the distance 26 from the edge of the waist opening WO to the tip of the sheet joint 70 on the side of the waist opening WO is less than 3 mm, or the elasticity of the waist edge located closest to the waist opening WO from the edge of the waist opening WO If the distance 27 to the elastic member 17 is less than 5 mm, the rigidity of the wavy irregularities formed at the edge of the waist opening WO tends to increase. Further, when the distance 26 from the edge of the waist opening WO to the front end of the seat joint 70 on the side of the waist opening WO exceeds 15 mm, there is no change in the effect of improving the wearing feeling of the waist edge W.
- the number of layers of the sheet material in the non-bonded / non-elastic elastic member region 25 is a two-layer structure (only the inner layer 21 and the outer layer 22 only) as in the rear body B shown in FIG. 5 or the form shown in FIG.
- It is preferable that at least one of the sheet materials 12S is folded back at the waist opening WO to obtain a layer structure of three or more layers.
- the number of layers of the sheet material in the non-bonded / non-elastic elastic member region 25 is three or more, the bulk of the non-bonded / non-elastic elastic member region 25 increases. It is possible to compensate, and it is possible to prevent the edge opening of the waist opening WO and the insufficient formation of shrinkage wrinkles.
- both the second sheet material 12H constituting the inner layer 21 and the first sheet material 12S constituting the outer layer 22 are integrally waisted.
- the number of sheets of the non-bonded / inelastic elastic member region 25 at the waist edge W is set to four.
- the structural example of the exterior body 12 shown in FIG.13 (b) is the 1st sheet material which folds back the 2nd sheet material 12H which comprises the inner layer 21 at the edge of the waist opening WO, and comprises the outer layer 22 12S, and the first sheet material 12S constituting the outer layer 22 is folded back at the edge of the waist opening WO and folded between the second sheet material 12H constituting the inner layer 21, thereby forming a waist edge.
- the number of layers of the sheet material in the non-bonded / inelastic elastic member region 25 in the portion W is four.
- the tip of the folded portion of the second sheet material 12H constituting the inner layer 21 and the tip of the folded portion of the sheet material constituting the outer layer are aligned (aligned) in the vertical direction, they are also displaced as shown in the figure. May be. Further, the folded portion may be within the non-bonded / non-elastic stretchable member region or may protrude.
- the second sheet material 12H constituting the inner layer 21 is extended to the non-bonded / inelastic elastic member region 25 at the waist edge W and the first layer constituting the outer layer 22 is formed.
- the sheet material 12S is folded inward at the edge of the waist opening WO, and the folded portion is overlapped with the end of the second sheet material 12H constituting the inner layer 21 in the non-bonded / non-elastic elastic member region 25. It is a thing. Although not shown, on the contrary, the sheet material constituting the outer layer is extended to the non-bonded / inelastic elastic member region at the waist edge, and the sheet material constituting the inner layer is folded inward at the edge of the waist opening.
- the folded portion may be configured to overlap the end portion of the sheet material constituting the outer layer in the non-bonded / non-elastic elastic member region.
- the first sheet material 12S constituting the outer layer 22 and the first layer constituting the inner layer 21 are provided in the overlapping portion of the second sheet material 12H constituting the inner layer 21 and the first sheet material 12S constituting the outer layer 22, the first sheet material 12S constituting the outer layer 22 and the first layer constituting the inner layer 21 are provided. Either of the two sheet materials 12H may be set on the inner side.
- the second sheet material 12H constituting the inner layer 21 and the first sheet material 12S constituting the outer layer 22 are indicated by different reference numerals similar to those shown in FIG. 5. However, it is possible to use a single sheet material in addition to the individual sheet material as shown in the figure.
- the waist edge W of the pants-type disposable diaper not only the waist edge W of the pants-type disposable diaper, but also a similar elastic structure is formed up to the waist lower part U and the middle part L.
- the waist edge W is included, the waist lower part U and the middle part For L, another known elastic structure may be applied, and the elastic elastic member 16 in the intermediate portion L may be omitted.
- the sheet joint portion 70 in each body is continuously provided in the vertical direction including the waist edge portion W, but the sheet joint portion 70 of the waist edge portion W and the sheet joint portion 70 of the waist lower portion U are individually and It can also be formed with a space between each other.
- a hot melt adhesive having a width of 1 mm and continuous in the CD direction is applied to the surface of the first sheet material on the second sheet material side with an interval of 7 mm in the MD direction, and further, continuous in the MD direction.
- 7 pieces of rubber thread are arranged in the CD direction at intervals of 5 mm, 270% of each stretched state, and the second sheet material is placed over the first sheet material so that the MD direction and the CD direction match the first sheet material.
- the material, the elastic elastic member and the second sheet material are pressure-bonded, and the elastic sheet sample No. 1 was produced. In addition, this sample No. The natural length of 1 in the MD direction was 67 mm.
- the application width of the hot melt adhesive was appropriately changed to 2 mm, 4 mm, 6 mm, and 10 mm, and the application interval of the hot melt adhesive was appropriately changed to 2 mm, 4 mm, 6 mm, 8 mm, and 10 mm. 2 to 13 were also produced. Observe the formation of wrinkles in these samples, ⁇ : The walls are very clean, ⁇ : Evaluation was made in four stages: ⁇ was formed beautifully, ⁇ : ⁇ was formed but not beautiful, ⁇ : ⁇ was insufficiently formed. The evaluation results are as shown in Table 1.
- the wrinkle was formed when the application
- the application width of the hot melt adhesive (that is, the dimension in the width direction of the sheet bonding portion) is 0.5 to 4 mm, and the application interval of the hot melt adhesive (that is, the interval between adjacent sheet bonding portions). It can be seen that desirable results are obtained when the thickness is 4 to 8 mm.
- compression 15 is a natural length, and the center of the pressure plate described later is aligned with the top position of the heel for five ridges, and compression characteristics (compression rigidity LC, compression energy WC, compression resilience RC, initial thickness T0, maximum load Thickness TM) was measured and the average value was calculated.
- compression stiffness LC is closer to 1, meaning that the compression stiffness is greater.
- the compression resilience RC is closer to 100, and the compression recovery is better.
- the initial thickness T0, compression stiffness LC, compression energy WC, and compression resilience RC are measured using a KES-FB3-AUTO-A automated compression tester based on KES (Kawabata's Evaluation System for Fabrics).
- the initial thickness T0 is the thickness of the sample at a pressure of 0.5 gf / cm 2 .
- the compression stiffness LC represents the linearity of the compression displacement, and the value increases as the load and the displacement (thickness reduction due to compression) are proportional.
- the compression energy WC represents the work of compression, and the larger the value, the better the feeling of swelling and the feeling of lower back.
- the compression resilience RC represents compression recovery, and the larger the numerical value, the smaller the hysteresis.
- these sample Nos. 14 and no. 15 is stretched about 1.65 times in the MD direction (assuming a diaper wearing state), and a microscopic image is taken from the side (magnification 30 times).
- the width 80X was measured for each ridge 80, and the average value was calculated.
- the photograph taken is shown in FIG. 14 and the height and width of the ridge are shown in Table 3.
- a KEYENCE digital microscope VHX-1000 was used for microscopic photography.
- ⁇ Experiment 3> Prepare the same first sheet material, elastic elastic member and second sheet material as in Experiment 1, and various hot melt adhesives with different melt viscosities and loop tack adhesive forces, and use the same equipment as shown in FIG. Adhesion test is performed at a speed of 187 m / min, and operational stability such as stringing of hot melt adhesive is achieved. ⁇ : There was no stringing and stable adhesion was possible. ⁇ : There is stringing, the accuracy of the coating width is low, and there is a problem in terms of operational stability. It was evaluated in two stages.
- the basis 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.
- the thickness is automatically measured using an automatic thickness measuring instrument (KES-G5 handy compression measurement program) under the conditions of load: 10 gf / cm 2 and pressure area: 2 cm 2 .
- test and measurement shall be performed in a standard room (test location is temperature 20 ⁇ 5 ° C., relative humidity 65% or less) in a test room or apparatus.
- the present invention is applicable to all pants-type disposable diapers.
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Abstract
Description
<請求項1記載の発明>
前身頃及び後身頃を構成する外装体と、この外装体の内面に固定された、吸収体を含む内装体とを備え、
前身頃における外装体の両側部と後身頃における外装体の両側部とがそれぞれ接合されてサイドシール部が形成されることにより、胴周り部が環状に形成されるとともに、ウエスト開口部及び左右一対の脚開口部が形成され、
前記外装体のウエスト縁部は、幅方向に沿ってかつ互いに間隔を空けて設けられた複数本の細長状のウエスト縁部弾性伸縮部材と、ウエスト縁部弾性伸縮部材の内側に面するシート材からなる内側層と、ウエスト縁部弾性伸縮部材の外側に面するシート材からなる外側層とを備えている、パンツタイプ使い捨ておむつにおいて、
前記内側層及び外側層が、幅方向に間欠的に配された、幅方向と交差する方向に連続する接着剤又は溶着加工により接合されて、シート接合部が形成されており、
前記ウエスト縁部弾性伸縮部材が、前記シート接合部と交差する位置で前記内側層及び外側層の少なくとも一方に固定されており、
前記ウエスト縁部弾性伸縮部材の収縮に伴い前記内側層及び外側層が収縮することにより、前記内側層及び外側層におけるシート接合部間に位置する部分が互いに反対向きに膨らんでそれぞれ襞が形成されており、
前記外装体のウエスト縁部におけるウエスト開口部側の端部に、前記シート接合部及び前記ウエスト縁部弾性伸縮部材を有さず、かつ縦方向範囲が最もウエスト開口部側に位置するウエスト縁部弾性伸縮部材とこれに隣接するウエスト縁部弾性伸縮部材との間隔よりも広い、無接合・無弾性伸縮部材領域を備えた、
ことを特徴とするパンツタイプ使い捨ておむつ。
従来のパンツタイプ使い捨ておむつにおいては、ウエスト縁部におけるウエスト開口部側の端部には無接合・無弾性伸縮部材領域が殆ど無く、それゆえこのようなウエスト縁部に縦方向連続接合形態を採用すると、前述の問題点が発生する。これに対して、本発明では、ウエスト縁部に縦方向連続接合形態を採用しつつ、ウエスト開口部の縁部に無接合・無弾性伸縮部材領域を広く確保したことにより、ウエスト開口部側の端部は硬質なシート接合部が無くなるとともに、ウエスト縁部弾性伸縮部材を有する領域よりも収縮皺が大きく疎らで柔軟になり、ウエスト縁部の装着感が良好なものとなる。しかも、外装体のウエスト縁部は、ウエスト開口部側の端部以外は縦方向連続接合形態となっているから、ウエスト縁部弾性伸縮部材の収縮によりウエスト縁部に形成される収縮皺は、ウエスト開口部側の端部では大きく疎らになるものの形成はされるため、収縮皺による縦方向の通気性は殆ど損なわれることもない。
前記ウエスト開口部の縁から前記シート接合部のウエスト開口部側の先端までの距離が3~15mmであり、前記ウエスト開口部の縁から最もウエスト開口部側に位置するウエスト縁部弾性伸縮部材までの距離が5~20mmである、請求項1記載のパンツタイプ使い捨ておむつ。
ウエスト開口部の縁からシート接合部のウエスト開口部側の先端までの距離が3mm未満であったり、ウエスト開口部の縁から最もウエスト開口部側に位置するウエスト縁部弾性伸縮部材までの距離が5mm未満であったりすると、ウエスト開口部の縁に形成される波状凹凸の剛性が高くなり易い。また、ウエスト開口部の縁からシート接合部のウエスト開口部側の先端までの距離が15mmを超えると、ウエスト縁部の装着感の向上効果に変わりはないが、無接合・無弾性伸縮部材領域に形成される皺が不規則になり易くなるため好ましくない。また、ウエスト開口部の縁から最もウエスト開口部側に位置するウエスト縁部弾性伸縮部材までの距離が20mmを超えるとウエスト縁部のフィット感が低下するため好ましくない。
前記無接合・無弾性伸縮部材領域は、前記内側層を構成するシート材及び外側層を構成するシート材の少なくとも一方が前記ウエスト開口部で折り返されることにより、三層以上の層構造とされている、請求項1又は2記載のパンツタイプ使い捨ておむつ。
このように、無接合・無弾性伸縮部材領域のシート材の層数を三層以上とすると、無接合・無弾性伸縮部材領域の嵩が増加するため、柔軟性を損なわずに剛性を補うことができ、ウエスト開口部の縁の捲れや、収縮皺の形成不十分を防止することができる。
前記内側層及び外側層は、前記ウエスト開口部で折り返された一枚のシート材における内側に位置する部分及び外側に位置する部分によりそれぞれ形成されている、請求項1~3のいずれか1項に記載のパンツタイプ使い捨ておむつ。
このように一枚のシート材で内側層及び外側層を形成することにより、資材コストを削減することができる。
前記シート接合部は前記接着剤により形成されており、
前記シート接合部と前記ウエスト縁部弾性伸縮部材とが交差する部分のうち、前記ウエスト縁部弾性伸縮部材の内側層側及び外側層側で前記接着剤が幅方向と交差する方向に連続されることにより、前記ウエスト縁部弾性伸縮部材が前記接着剤により前記内側層及び外側層に固定されている、
請求項1~4のいずれか1項に記載のパンツタイプ使い捨ておむつ。
このように、内側層及び外側層の両方に対して接着剤が連続的に存在することにより、ウエスト縁部弾性伸縮部材を強固に固定することができる。
各シート接合部の幅方向の寸法が0.5~4mmであり、隣り合うシート接合部の幅方向の間隔が4~8mmである、請求項1~5のいずれか1項に記載のパンツタイプ使い捨ておむつ。
このように、縦方向連続接合形態を基本とし、隣り合うシート接合部の間隔及び各シート接合部の幅方向の寸法を特定の範囲で組み合わせると、真直ぐに延びる襞でありながら十分な高さと倒れにくさを両立させることができる。各シート接合部の幅方向の寸法は隣り合う襞の間隔に影響を及ぼすものであり、縦方向連続接合形態のように、形成される襞が薄い場合にこの幅が4mmを超えると、隣り合う襞の間が広くなり過ぎ、個々の襞が独立した見栄えとなるだけでなく、厚み方向の圧縮力により襞が潰れ広がる、倒れる等の変形をするとき、隣り合う襞が支え合う作用が弱くなる結果、変形に対する抵抗あるいは変更後の復元も弱くなり、結果的にフンワリ感が不十分となってしまう。
隣り合う前記ウエスト縁部弾性伸縮部材の間隔が10mm以下である、請求項1~6のいずれか1項に記載のパンツタイプ使い捨ておむつ。
本発明の場合、隣り合うウエスト縁部弾性伸縮部材の間隔(中心間隔ではない)が10mmを超えると、縦方向間欠接合形態ほどではないが、襞の厚みが幅方向と交差する方向に変化し、もこもことした雲形又は波形となる。よって、本発明では、隣り合うウエスト縁部弾性伸縮部材の間隔は10mm以下とすることが好ましい。
前記内側層及び外側層はそれぞれ、厚み0.1~1mm、目付け10~20g/m2の不織布である、請求項1~7のいずれか1項に記載のパンツタイプ使い捨ておむつ。
本発明は、このような内側層及び外側層に特に好適なものである。
前記ウエスト縁部を幅方向に完全に展開した状態における前記ウエスト縁部弾性伸縮部材の伸長率が200~350%である、請求項1~8のいずれか1項に記載のパンツタイプ使い捨ておむつ。
このような伸長率を採用することにより、上述の本発明の作用効果がより顕著なものとなる。なお、伸長率とは自然長を100%としたときの値を意味する。
前記内側層及び外側層は、前記幅方向の剛軟度が前記幅方向と直交する方向の剛軟度よりも高い不織布である、請求項1~9のいずれか1項に記載のパンツタイプ使い捨ておむつ。
内側層及び外側層としては不織布が好適であるが、その場合に幅方向の剛軟度が低いと、襞が薄く鋭利な形状になるとともに倒れ易くなり、また、厚み方向の圧縮復元性も乏しくなる。これを改善するために不織布の目付けを増やすことも考えられるが、ゴワゴワして(剛性が向上しすぎて)見た目はフンワリしていても触ったときの柔らかさが乏しくなるおそれがある。一方、幅方向の剛軟度が幅方向と直交する方向の剛軟度よりも高い不織布を内側層及び外側層に用いると、襞が丸く膨らみ易くなり、厚み方向の圧縮回復性に富むようになるとともに、襞が倒れにくくなり、しかも触ったときの柔らかさに富むようになる。
図1~図8は、パンツタイプ使い捨ておむつの一例100を示している。このパンツタイプ使い捨ておむつ100は、製品外面(裏面)をなす外装体12と、外装体12の内面に貼り付けられた内装体200とから構成されているものである。符号Yはおむつの全長を示しており、符号Xはおむつの全幅を示している。
内装体200は任意の形状を採ることができるが、図示の形態では長方形である。内装体200は、図3~図5に示されるように、身体側となる表面シート30と、液不透過性シート11と、これらの間に介在された吸収要素50とを備えているものであり、吸収機能を担う本体部である。符号40は、表面シート30を透過した液を速やかに吸収要素50へ移行させるために、表面シート30と吸収要素50との間に設けられた中間シート(セカンドシート)を示しており、符号60は、内装体200の両脇に排泄物が漏れるのを防止するために、内装体200の両側に設けられた、身体側に起立する立体ギャザー60を示している。
表面シート30は、液を透過する性質を有するものであり、例えば、有孔又は無孔の不織布や、多孔性プラスチックシートなどを例示することができる。また、このうち不織布は、その原料繊維が何であるかは、特に限定されない。例えば、ポリエチレンやポリプロピレン等のオレフィン系、ポリエステル系、ポリアミド系等の合成繊維、レーヨンやキュプラ等の再生繊維、綿等の天然繊維などや、これらから二種以上が使用された混合繊維、複合繊維などを例示することができる。さらに、不織布は、どのような加工によって製造されたものであってもよい。加工方法としては、公知の方法、例えば、スパンレース法、スパンボンド法、サーマルボンド法、メルトブローン法、ニードルパンチ法、エアスルー法、ポイントボンド法等を例示することができる。例えば、柔軟性、ドレープ性を求めるのであれば、スパンボンド法、スパンレース法が、嵩高性、ソフト性を求めるのであれば、エアスルー法、ポイントボンド法、サーマルボンド法が、好ましい加工方法となる。
表面シート30を透過した液を速やかに吸収体へ移行させるために、表面シート30より液の透過速度が速い、中間シート(「セカンドシート」とも呼ばれている)40を設けることができる。この中間シート40は、液を速やかに吸収体へ移行させて吸収体による吸収性能を高めるばかりでなく、吸収した液の吸収体からの「逆戻り」現象を防止し、表面シート30上を常に乾燥した状態とすることができる。中間シート40は省略することもできる。
液不透過性シート11の素材は、特に限定されるものではないが、例えば、ポリエチレンやポリプロピレン等のオレフィン系樹脂等からなるプラスチックフィルムや、不織布の表面にプラスチックフィルムを設けたラミネート不織布、プラスチックフィルムに不織布等を重ねて接合した積層シートなどを例示することができる。液不透過性シート11には、近年、ムレ防止の観点から好まれて使用されている不透液性かつ透湿性を有する素材を用いることが好ましい。透湿性を有するプラスチックフィルムとしては、ポリエチレンやポリプロピレン等のオレフィン系樹脂中に無機充填剤を混練して、シートを成形した後、一軸又は二軸方向に延伸して得られた微多孔性プラスチックフィルムが広く用いられている。この他にも、マイクロデニール繊維を用いた不織布、熱や圧力をかけることで繊維の空隙を小さくすることによる防漏性強化、高吸水性樹脂または疎水性樹脂や撥水剤の塗工といった方法により、プラスチックフィルムを用いずに液不透過性としたシートも、液不透過性シート11として用いることができる。
立体ギャザー60は、内装体200の両側部に沿って前後方向全体にわたり延在する帯状部材であり、表面シート30上を伝わって横方向に移動する尿や軟便を遮断し、横漏れを防止するために設けられているものである。本実施の形態の立体ギャザー60は、内装体200の側部から起立するように設けられ、付け根側の部分は幅方向中央側に向かって斜めに起立し、中間部より先端側の部分は幅方向外側に向かって斜めに起立するものである。
吸収要素50は、吸収体56と、この吸収体56の全体を包む包装シート58とを有する。包装シート58は省略することもできる。
吸収体56は、繊維の集合体により形成することができる。この繊維集合体としては、綿状パルプや合成繊維等の短繊維を積繊したものの他、セルロースアセテート等の合成繊維のトウ(繊維束)を必要に応じて開繊して得られるフィラメント集合体も使用できる。繊維目付けとしては、綿状パルプや短繊維を積繊する場合は、例えば100~300g/m2程度とすることができ、フィラメント集合体の場合は、例えば30~120g/m2程度とすることができる。合成繊維の場合の繊度は、例えば、1~16dtex、好ましくは1~10dtex、さらに好ましくは1~5dtexである。フィラメント集合体の場合、フィラメントは、非捲縮繊維であってもよいが、捲縮繊維であるのが好ましい。捲縮繊維の捲縮度は、例えば、1インチ当たり5~75個、好ましくは10~50個、さらに好ましくは15~50個程度とすることができる。また、均一に捲縮した捲縮繊維を用いる場合が多い。吸収体56中には高吸収性ポリマー粒子を分散保持させるのが好ましい。
吸収体56には、その一部又は全部に高吸収性ポリマー粒子を含有させることができる。高吸収性ポリマー粒子とは、「粒子」以外に「粉体」も含む。高吸収性ポリマー粒子の粒径は、この種の吸収性物品に使用されるものをそのまま使用でき、1000μm以下、特に150~400μmのものが望ましい。高吸収性ポリマー粒子の材料としては、特に限定無く用いることができるが、吸水量が40g/g以上のものが好適である。高吸収性ポリマー粒子としては、でんぷん系、セルロース系や合成ポリマー系などのものがあり、でんぷん-アクリル酸(塩)グラフト共重合体、でんぷん-アクリロニトリル共重合体のケン化物、ナトリウムカルボキシメチルセルロースの架橋物やアクリル酸(塩)重合体などのものを用いることができる。高吸収性ポリマー粒子の形状としては、通常用いられる粉粒体状のものが好適であるが、他の形状のものも用いることができる。
包装シート58を用いる場合、その素材としては、ティッシュペーパ、特にクレープ紙、不織布、ポリラミ不織布、小孔が開いたシート等を用いることができる。ただし、高吸収性ポリマー粒子が抜け出ないシートであるのが望ましい。クレープ紙に換えて不織布を使用する場合、親水性のSMS不織布(SMS、SSMMS等)が特に好適であり、その材質はポリプロピレン、ポリエチレン/ポリプロピレン複合材などを使用できる。目付けは、5~40g/m2、特に10~30g/m2のものが望ましい。
外装体12は、股間部から腹側に延在する前身頃Fを構成する部分と、股間部から背側に延在する後身頃Bを構成する部分とを有し、これら前身頃Fの両側部と後身頃Bの両側部とが接合されて、図8に示すように、装着者の胴を通すためのウエスト開口部WO及び脚を通すための左右一対の脚開口部LOが形成されているものである。符号12Aは接合部分を示している(以下、この部分をサイドシール部ともいう)。なお、股間部とは、展開状態における前身頃Fのウエスト縁から後身頃Bのウエスト縁までの前後方向中央を意味し、それよりも前側の部分及び後側の部分が前身頃F及び後身頃Bをそれぞれ意味する。
外装体12は、図11に示すように、一枚のシート材12Sの前後両側を折り返すことにより全体を形成することもできる。
また、上述の例では、前身頃Fから後身頃Bまでを一体的な外装体12により連続的に覆っているが、腹側の外装体と背側の外装体とが股間側で連続しておらず、離間されている形態とすることもでき(図示略)、その場合、内装体の外面のうち、腹側部分の外装体と背側の外装体との間に露出する部分を覆う股間部外装体を貼り付けることもできる。股間部外装体としては、前述した外装体に用いられるものと同様の資材を用いることができる。外装体を腹側及び背側で分割する場合は、各外装体の内側層及び外側層を図5に示される形態に倣って第1のシート材及び第2のシート材により形成する他、一枚のシート材をウエスト開口部側で二つ折り又は所謂C折りにして形成することもできる。
本パンツタイプ使い捨ておむつにおいては、ウエスト縁部Wから中間部Lにかけての領域に縦方向連続接合形態に基づく伸縮構造が採用されている。すなわち、当該領域では、図6に示すように、第1シート材12S及び第2シート材12Hにより形成される内側層21及び外側層22が、幅方向に間欠的に配された、幅方向と交差(図示形態では直交)する方向に所定の幅で連続する接着剤71(ホットメルト接着剤等)により接合されて、シート接合部70が形成されている。各シート接合部70の幅方向の寸法70wは0.5~4mmとされるのが好ましく、隣り合うシート接合部70の間隔70dが4~8mm(好ましくは5~7mm)とされるのが好ましい。シート接合部70の幅方向の寸法70wの下限は、1mmとすると製造容易性の観点からは好ましいが、柔軟性の観点からは0.5mmとすることが好ましい。一方、シート接合部70の幅方向の寸法70wの上限は2mmであると好ましく、1.5mmであるとより好ましい。
また、ホットメルト接着剤71の溶融粘度は、JIS Z 8803に従い、ブルックフィールドB型粘度計(スピンドルNo.027)を用いて、規定の温度で測定されるものである。
特徴的には、図5及び図6、並びに図11~図14にも示すように、外装体12のウエスト縁部Wにおけるウエスト開口部WO側の端部に、シート接合部70及びウエスト縁部弾性伸縮部材17を有さず、かつ縦方向範囲が最もウエスト開口部WO側に位置するウエスト縁部弾性伸縮部材17とこれに隣接するウエスト縁部弾性伸縮部材17との間隔17dよりも広い、無接合・無弾性伸縮部材領域25を備えている。図示形態では、前身頃F及び後身頃Bの両方に無接合・無弾性伸縮部材領域25を備えているが、いずれか一方のみとしても良い。
また、図13(b)に示す外装体12の構造例は、内側層21を構成する第2シート材12Hをウエスト開口部WOの縁で外側に折り返して外側層22を構成する第1シート材12Sとの間に折り込むとともに、外側層22を構成する第1シート材12Sをウエスト開口部WOの縁で折り返して内側層21を構成する第2シート材12Hとの間に折り込むことにより、ウエスト縁部Wにおける無接合・無弾性伸縮部材領域25のシート材の層数を四層としたものである。内側層21を構成する第2シート材12Hの折り返し部分の先端、及び外側層を構成するシート材の折り返し部分の先端は縦方向に一致(揃う)していても、また図示形態のようにずれていても良い。また、折り返し部分は無接合・無弾性伸縮部材領域内に収まっていても、はみ出していても良い。
図13(c)に示す形態は、内側層21を構成する第2シート材12Hをウエスト縁部Wにおける無接合・無弾性伸縮部材領域25まで延材させるとともに、外側層22を構成する第1シート材12Sをウエスト開口部WOの縁で内側に折り返し、この折り返し部分を、無接合・無弾性伸縮部材領域25内で、内側層21を構成する第2シート材12Hの端部と重なるようにしたものである。図示しないが、反対に、外側層を構成するシート材をウエスト縁部における無接合・無弾性伸縮部材領域まで延材させるとともに、内側層を構成するシート材をウエスト開口部の縁で内側に折り返し、この折り返し部分を、無接合・無弾性伸縮部材領域内で、外側層を構成するシート材の端部と重なるように構成しても良い。また、内側層21を構成する第2シート材12H及び外側層22を構成する第1シート材12Sの重なり部分においては、外側層22を構成する第1シート材12S及び内側層21を構成する第2シート材12Hのいずれを内側としても良い。
なお、これらの図13に示す形態において、内側層21を構成する第2シート材12H及び外側層22を構成する第1シート材12Sは、図5に示される形態と同様の別々の符号で示されているが、図示形態のように個別のシート材とする他、一枚の共通のシート材とすることもできる。
上記例は、パンツタイプ使い捨ておむつのウエスト縁部Wだけでなく、ウエスト下部U及び中間部Lまで同様の伸縮構造を形成しているが、ウエスト縁部Wを含む限り、ウエスト下部Uや中間部Lは他の公知の伸縮構造を適用しても良く、また中間部Lの弾性伸縮部材16を省略しても良い。また、上記例では各身頃におけるシート接合部70をウエスト縁部Wを含めて縦方向に連続させたが、ウエスト縁部Wのシート接合部70及びウエスト下部Uのシート接合部70を個別にかつ互いに間隔を空けて形成することもできる。
繊度1.6デニール、目付け17g/m2、厚み0.2mm(初期厚みT0:0.5g/cm2圧力下での厚み)、MD方向(不織布の製造ラインの方向)の剛軟度55mm、CD方向(MD方向と直交する方向)の剛軟度28mmのポリプロピレン繊維SSS不織布を切断して、MD方向の長さ180mm、CD方向の長さ40mmの第1シート材及び第2シート材を用意した。また、弾性伸縮部材として470dtexの糸ゴムを用意した。
そして、第1シート材における第2シート材側の面に、幅1mmでCD方向に連続するホットメルト接着剤をMD方向に7mmの間隔を空けて塗布し、その上に、MD方向に連続する糸ゴムをCD方向に5mm間隔で7本、それぞれ270%の伸長状態で配置し、その上からMD方向及びCD方向が第1シート材と合うように第2シート材を被せて、第1シート材、弾性伸縮部材及び第2シート材を圧着し、伸縮シートのサンプルNo.1を作製した。なお、このサンプルNo.1のMD方向の自然長は67mmであった。さらに、ホットメルト接着剤の塗布幅を2mm、4mm、6mm、10mmに、及びホットメルト接着剤の塗布間隔を2mm、4mm、6mm、8mm、10mmに適宜変更し、サンプルNo.2~13も作製した。
これらのサンプルで襞の形成状況を観察し、◎:壁が非常にきれいに形成されている、
○:襞が綺麗に形成されている、△:襞が形成されているが綺麗ではない、×:襞の形成が不十分、の四段階で評価した。評価結果は表1に示す通りであった。なお、ホットメルト接着剤の塗布間隔が10mmでは襞は形成されるが、大きすぎて圧縮時に潰れてしまい、2mmでは襞が形成されなかった。また、ホットメルト接着剤の塗布幅が6mm及び10mmのものでは、シート接合部も収縮して皺が形成された。
実験1と同様(ただし、ホットメルト接着剤の塗布幅2mm、塗布間隔6mm)にして伸縮シートのサンプルNo.14を作製した。
ホットメルト接着剤の連続方向を第1シート材及び第2シート材のMD方向とし、糸ゴムの方向を第1シート材及び第2シート材のCD方向とした以外は、サンプルNo.14と同様にしてサンプルNo.15を作成した。
そして、これらサンプルNo.14及びNo.15を自然長で、5か所の襞について襞の頂部位置に後述の加圧板の中心を合わせて圧縮特性(圧縮剛さLC、圧縮エネルギーWC、圧縮レジリエンスRC、初期厚みT0、最大荷重時の厚みTM)を測定し、平均値を算出した。なお、圧縮剛さLCは1に近い程圧縮剛いことを意味し、圧縮エネルギーWCは大きい程圧縮され易いことを意味し、圧縮レジリエンスRCは値が100に近い程圧縮に対する回復性がよいことを意味する。初期厚みT0、圧縮剛さLC、圧縮エネルギーWCおよび圧縮レジリエンスRCは、KES(Kawabata's Evaluation System for Fabrics)に基づき、KES-FB3-AUTO-A 自動化圧縮試験機を用いて計測する。測定は、圧縮面積2cm2の円形平面をもつ鋼製加圧板間で、0gf/cm2から最大圧縮荷重50gf/cm2まで試料を圧縮し、元に戻す間で行う。初期厚みT0は、圧力0.5gf/cm2における試料の厚みである。圧縮剛さLCは、圧縮変位の直線性を表わし、荷重と変位(圧縮による厚さの減少)が比例するもの程数値が大きくなる。圧縮エネルギーWCは圧縮の仕事量を表し、数値が大きい程、膨らみ感、腰感に優れる。圧縮レジリエンスRCは、圧縮回復性を表わし、数値が大きい程ヒステリシスが小さい。
実験1と同じ第1シート材、弾性伸縮部材及び第2シート材、並びに溶融粘度及びループタック粘着力の異なる各種のホットメルト接着剤を用意し、図19に示すのと同様の設備で、ライン速度187m/分で接着試験を行い、ホットメルト接着剤の糸引き等の操業安定性を、
○:糸引きが無く、安定して接着を行うことができた。
×:糸引きがあり、塗布幅の精度が低く、操業安定性の点で問題あり。
の二段階で評価した。
明細書中の以下の用語は、明細書中に特に記載が無い限り、以下の意味を有するものである。
(ゲル強度)
ゲル強度は次のようにして測定されるものである。人工尿(尿素:20wt%、食塩:8wt%、塩化カルシウム二水和物:0.3wt%、酸化マグネシウム七水和物:0.8wt%、純水:70.01wt%)49.0gに、高吸収性ポリマーを1.0g加え、スターラーで攪拌させる。生成したゲルを40℃×60%RHの恒温恒湿槽内に3時間放置したあと常温にもどし、カードメーター(I.techno Engineering社製:Curdmeter-MAX ME-500)でゲル強度を測定する。
目付けは次のようにして測定されるものである。試料又は試験片を予備乾燥した後、標準状態(試験場所は、温度20±5℃、相対湿度65%以下)の試験室又は装置内に放置し、恒量になった状態にする。予備乾燥は、試料又は試験片を相対湿度10~25%、温度50℃を超えない環境で恒量にすることをいう。なお、公定水分率が0.0%の繊維については、予備乾燥を行わなくてもよい。恒量になった状態の試験片から米坪板(200mm×250mm、±2mm)を使用し、200mm×250mm(±2mm)の寸法の試料を切り取る。試料の重量を測定し、20倍して1平米あたりの重さを算出し、目付けとする。
厚みは、自動厚み測定器(KES-G5 ハンディ圧縮計測プログラム)を用い、荷重:10gf/cm2、及び加圧面積:2cm2の条件下で自動測定する。
Claims (10)
- 前身頃及び後身頃を構成する外装体と、この外装体の内面に固定された、吸収体を含む内装体とを備え、
前身頃における外装体の両側部と後身頃における外装体の両側部とがそれぞれ接合されてサイドシール部が形成されることにより、胴周り部が環状に形成されるとともに、ウエスト開口部及び左右一対の脚開口部が形成され、
前記外装体のウエスト縁部は、幅方向に沿ってかつ互いに間隔を空けて設けられた複数本の細長状のウエスト縁部弾性伸縮部材と、ウエスト縁部弾性伸縮部材の内側に面するシート材からなる内側層と、ウエスト縁部弾性伸縮部材の外側に面するシート材からなる外側層とを備えている、パンツタイプ使い捨ておむつにおいて、
前記内側層及び外側層が、幅方向に間欠的に配された、幅方向と交差する方向に連続する接着剤又は溶着加工により接合されて、シート接合部が形成されており、
前記ウエスト縁部弾性伸縮部材が、前記シート接合部と交差する位置で前記内側層及び外側層の少なくとも一方に固定されており、
前記ウエスト縁部弾性伸縮部材の収縮に伴い前記内側層及び外側層が収縮することにより、前記内側層及び外側層におけるシート接合部間に位置する部分が互いに反対向きに膨らんでそれぞれ襞が形成されており、
前記外装体のウエスト縁部におけるウエスト開口部側の端部に、前記シート接合部及び前記ウエスト縁部弾性伸縮部材を有さず、かつ縦方向範囲が最もウエスト開口部側に位置するウエスト縁部弾性伸縮部材とこれに隣接するウエスト縁部弾性伸縮部材との間隔よりも広い、無接合・無弾性伸縮部材領域を備えた、
ことを特徴とするパンツタイプ使い捨ておむつ。 - 前記ウエスト開口部の縁から前記シート接合部のウエスト開口部側の先端までの距離が3~15mmであり、前記ウエスト開口部の縁から最もウエスト開口部側に位置するウエスト縁部弾性伸縮部材までの距離が5~20mmである、請求項1記載のパンツタイプ使い捨ておむつ。
- 前記無接合・無弾性伸縮部材領域は、前記内側層を構成するシート材及び外側層を構成するシート材の少なくとも一方が前記ウエスト開口部で折り返されることにより、三層以上の層構造とされている、請求項1又は2記載のパンツタイプ使い捨ておむつ。
- 前記内側層及び外側層は、前記ウエスト開口部で折り返された一枚のシート材における内側に位置する部分及び外側に位置する部分によりそれぞれ形成されている、請求項1~3のいずれか1項に記載のパンツタイプ使い捨ておむつ。
- 前記シート接合部は前記接着剤により形成されており、
前記シート接合部と前記ウエスト縁部弾性伸縮部材とが交差する部分のうち、前記ウエスト縁部弾性伸縮部材の内側層側及び外側層側で前記接着剤が幅方向と交差する方向に連続されることにより、前記ウエスト縁部弾性伸縮部材が前記接着剤により前記内側層及び外側層に固定されている、
請求項1~4のいずれか1項に記載のパンツタイプ使い捨ておむつ。 - 各シート接合部の幅方向の寸法が0.5~4mmであり、隣り合うシート接合部の幅方向の間隔が4~8mmである、請求項1~5のいずれか1項に記載のパンツタイプ使い捨ておむつ。
- 隣り合う前記ウエスト縁部弾性伸縮部材の間隔が10mm以下である、請求項1~6のいずれか1項に記載のパンツタイプ使い捨ておむつ。
- 前記内側層及び外側層はそれぞれ、厚み0.1~1mm、目付け10~20g/m2の不織布である、請求項1~7のいずれか1項に記載のパンツタイプ使い捨ておむつ。
- 前記ウエスト縁部を幅方向に完全に展開した状態における前記ウエスト縁部弾性伸縮部材の伸長率が200~350%である、請求項1~8のいずれか1項に記載のパンツタイプ使い捨ておむつ。
- 前記内側層及び外側層は、前記幅方向の剛軟度が前記幅方向と直交する方向の剛軟度よりも高い不織布である、請求項1~9のいずれか1項に記載のパンツタイプ使い捨ておむつ。
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