WO2011065247A1 - 吸収性物品 - Google Patents
吸収性物品 Download PDFInfo
- Publication number
- WO2011065247A1 WO2011065247A1 PCT/JP2010/070291 JP2010070291W WO2011065247A1 WO 2011065247 A1 WO2011065247 A1 WO 2011065247A1 JP 2010070291 W JP2010070291 W JP 2010070291W WO 2011065247 A1 WO2011065247 A1 WO 2011065247A1
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- density
- sheet
- skin care
- nonwoven fabric
- care agent
- Prior art date
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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
- A61F13/51—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
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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
- A61F13/51—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
- A61F13/51113—Topsheet, i.e. the permeable cover or layer facing the skin comprising an additive, e.g. lotion or odour control
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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
- A61F13/51—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
- A61F13/51113—Topsheet, i.e. the permeable cover or layer facing the skin comprising an additive, e.g. lotion or odour control
- A61F2013/51117—Topsheet, i.e. the permeable cover or layer facing the skin comprising an additive, e.g. lotion or odour control the lotion having skin care properties
Definitions
- the present invention relates to an absorbent article such as a disposable diaper, a sanitary napkin, a panty liner (orimono sheet), an incontinence pad, and the like.
- Patent Document 1 describes an absorbent article in which a lotion composition containing an emollient and a fixing agent is applied to a top sheet in a non-uniform pattern.
- Patent Document 2 a lotion is applied to a liquid-permeable top sheet in the form of a pattern composed of a plurality of strips, and the strips are separated by a plurality of regions not provided with a lotion.
- a disposable absorbent article is described in which the pattern consisting of is a discontinuous pattern.
- the applicant first applies a diamide derivative having a specific structure that moves to the skin of the wearer and functions as an oily skin care agent on the surface of the absorbent article that is applied to the wearer's skin when worn. (Refer to Patent Document 3).
- Patent Documents 1 and 2 describe that a lotion composition corresponding to a skin care agent is partially applied to a surface sheet in a predetermined pattern.
- a large amount of skin care agent is applied to the top sheet for the purpose of enhancing the skin care effect, etc.
- the liquid permeability inherent to the top sheet is often adversely affected, and there is room for improvement from the viewpoint of further improving the skin care effect. there were.
- the present invention relates to an absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable or water-repellent back sheet, and an absorbent body disposed between the two sheets, wherein the top sheet has a mutual density.
- the top sheet has a mutual density.
- the absorbent article of the present invention can retain a large amount of skin care agent while maintaining good liquid permeability of the topsheet.
- FIG. 3 is a partially broken plan view of a disposable diaper showing a basic configuration common to the disposable diapers of the first to fourth embodiments of the present invention. It is a perspective view of the surface sheet used for 1st Embodiment. It is sectional drawing which follows the X direction of the surface sheet used for 1st Embodiment. It is a figure which shows typically the manufacturing process of the solid sheet in the preferable manufacturing method of the surface sheet used for 1st Embodiment. It is a figure which shows typically the provision process of the skin care agent in the preferable manufacturing method of the surface sheet used for 1st Embodiment. It is a perspective view of the surface sheet used for 2nd Embodiment.
- FIG. 9 is a schematic enlarged sectional view taken along line II of the top sheet shown in FIG. 8. It is a perspective view of the surface sheet used for 4th Embodiment. It is a top view of the surface sheet used for 4th Embodiment. It is sectional drawing which follows the Y direction of the surface sheet used for 4th Embodiment. It is a figure which shows typically the manufacturing process of the solid sheet in the preferable manufacturing method of the surface sheet used for 4th Embodiment. It is a schematic cross section which shows the pressurization preservation
- FIG. 1 is a plan view showing the disposable diaper 1 according to the first embodiment of the present invention, partially broken away.
- the disposable diaper 1 of the first embodiment (hereinafter, also simply referred to as diaper 1) includes a liquid-permeable top sheet 10, a liquid-impermeable or water-repellent back sheet 30, and a space between these two sheets.
- the liquid-retaining absorbent 40 is provided.
- the diaper 1 has the back side part A distribute
- side sheets 70 made of a water-repellent nonwoven fabric are disposed so as to cover both side portions of the topsheet 10.
- the top sheet 10 and each side sheet 70 are joined to the back sheet 30 outside the periphery of the absorber 40.
- An elastic member 71 for forming leg gathers is disposed on the leg flap portion outside the side edge of the absorber 40, and three-dimensional gathering is formed on the side edge of the side sheet 70 on the center side in the diaper width direction.
- An elastic member 72 is provided.
- the diaper 1 is a so-called unfolded diaper, by fastening fastening tapes 50, 50 provided on both side edges of the back side A to a landing tape 60 provided on the outer surface of the abdominal side C.
- the absorber 40, the fastening tape 50, the landing tape 60, the side sheet 70, and the elastic members 71 and 72 those used for this type of article can be used without any particular limitation. it can.
- the absorbent body 40 a fiber aggregate made of a fiber material such as pulp fiber or a fiber aggregate that holds a water-absorbing polymer particle or the like covered with tissue paper or a water-permeable nonwoven fabric may be used. it can.
- the surface sheet 10 in 1st Embodiment consists of a nonwoven fabric sheet which has the upper layer nonwoven fabric 11 orient
- the upper nonwoven fabric 11 and the lower nonwoven fabric 12 are partially joined to form a large number of joined portions 13.
- the upper non-woven fabric 11 protrudes toward the wearer's skin at a portion other than the joint portion 13 to form a large number of convex portions 14 that are hollow inside.
- the space between the convex portions 14 and 14 in the surface sheet 10 is a relatively concave portion, and the joint portion 13 exists at the bottom of the concave portion.
- the convex portions 14 and the joint portions 13 are arranged alternately and in a row in one direction, and the rows are arranged in multiple rows.
- the upper nonwoven fabric 11 is made of a sheet material that does not substantially expand and contract
- the lower nonwoven fabric 12 is made of a sheet material that does not substantially expand and contract.
- the convex part 14 shown in FIG. 2 has a rectangular bottom surface.
- the convex part 14 is a flat rectangular parallelepiped or a truncated quadrangular pyramid whose ridgeline is rounded as a whole.
- the junction 13 is rectangular.
- nonwoven fabric sheet of the present invention a single layer nonwoven fabric, a laminated nonwoven fabric of two or more layers, two nonwoven fabrics as in this embodiment, and a partial gap is formed between them.
- a sheet or the like that is partially joined in a predetermined pattern is included.
- the convex portions 14 and the joint portions 13 are arranged alternately and in a row in one direction.
- the convex portions 14 and the joint portions 13 are alternately arranged along the X direction in FIG.
- the X direction coincides with the flow direction in the manufacturing process of the three-dimensional sheet 10 ′ and the topsheet 10 described later, and is also the longitudinal direction of the absorbent article when the topsheet 10 is incorporated in the diaper 1 (absorbent article).
- column which consists of the convex part 14 and the junction part 13 is arrange
- no convex portion is located at a position adjacent to the one convex portion.
- “No convex part is located adjacent to one convex part” means that when one convex part is focused, the convex part is not located at the same position in the adjacent row. I mean. In other words, in the Y direction in FIG. 2, in other words, in the width direction (Y direction) of the diaper, it means that the convex portions are not arranged so that the convex portions between adjacent rows are completely connected.
- both a part of a convex part and a part of junction part may exist in the position adjacent to one convex part, or only a junction part may exist.
- the projections are arranged so as to be completely continuous with respect to the Y direction of the diaper 1, a projection that apparently extends in the Y direction will be formed. It tends to flow out along the side and may cause liquid leakage.
- the joints are arranged with a half pitch shift in two adjacent rows. Accordingly, when attention is paid to any one convex portion 14 in one row, the one convex portion 14 is surrounded by the joint portion 13 at the front and rear and the right and left.
- the joint portion 13 and the convex portion 14 are arranged in a staggered pattern.
- the top sheet 10 is an upper layer in which the joining region 13A having a joining portion 13 in which the two nonwoven fabrics 11 and 12 are joined and the two nonwoven fabrics 11 and 12 are not joined in the plane direction.
- the non-woven fabric 11 has a convex region 14A forming the convex portion 14, and the density of the convex region 14A is lower than the density of the joint region 13A.
- the planar direction of the surface sheet 10 and a three-dimensional sheet 10 ′ described later is a direction parallel to the upper and lower surfaces of these sheets.
- the density of the surface sheet 10 or the three-dimensional sheet 10 ′ in the convex part region 14 ⁇ / b> A is based on the volume of the hollow part. Calculate without including in the volume of the sheet.
- the bonding portion region 13A and the convex portion region 14A are a high-density portion and a low-density portion having different densities from each other, and are low-density portions as shown in FIG.
- a larger amount of the skin care agent 5 is applied to the convex region 14A than the joint region 13A which is a high density portion.
- the expression “application” includes any case where it is applied to the surface of the nonwoven fabric, or the case where it is contained inside the nonwoven fabric or nonwoven fabric sheet by impregnation or the like.
- the skin care agent 5 is contained in both the upper nonwoven fabric 11 and the lower nonwoven fabric 12 in the convex region 14A.
- the “amount” in a large amount of skin care agent is an amount per same area of the surface sheet (for example, 0.5 to 10 g / m 2 ).
- the expression that a higher amount of skin care agent is applied to the low density part than the high density part includes the case where the high density part contains no skin care agent and the case where the high density part also contains skin care agent. However, the case where the amount is less than the low density portion is included.
- the diaper 1 of this embodiment can be worn and used in the same manner as a normal unfolded diaper.
- the surface sheet 10 described above is incorporated in the diaper 1 with the upper nonwoven fabric 11 side directed toward the skin and the lower nonwoven fabric 12 side directed toward the absorber 40 side.
- the convex region 14A which is a low-density portion of the top sheet 10 of the diaper 1 of the present embodiment, has a larger inter-fiber gap than the joint region 13A, which is a high-density portion. Since the skin care agent is contained in the low density part where the inter-fiber gap is large, a relatively large amount of skin care agent can be retained on the top sheet 10 as compared with the case where it is contained in the high density part. In addition, when trying to hold a large amount of skin care agent in a high density part where the inter-fiber voids are small, liquid permeability tends to be adversely affected, but the skin care agent is held in the low density part as in this embodiment. In such a case, such a problem is unlikely to occur.
- region 14A which is a low density part are distributed in the plane direction of the surface sheet 10.
- the front and rear and the left and right of one convex portion 14 are surrounded by the concave portions, in other words, the convex portion region 14A that is the low density portion is surrounded by the joint portion region 13A that is the high density portion.
- the joint region 13A that is a high-density portion is located between the convex regions 14A and 14A that are low-density portions in one direction (X direction) in the plane direction of the topsheet 10.
- the skin care agent in the direction (Y direction) orthogonal to the one direction, it is located between the convex regions 14A and 14A which are low density portions.
- the skin care agent in the low density and soft low density part, it is possible to easily fit the skin and easily transfer the skin care agent to the skin.
- the low density part is surrounded by the high density part, the skin care agent can be prevented from inadvertently moving the top sheet, which is suitable for giving a necessary amount to the skin.
- the skin care agent is applied to the skin that the area of the low-density part is larger than the area of the high-density part in a plan view of the surface sheet. It is preferable from the viewpoint that a sufficient amount can be transferred to the skin even if the coating amount per unit area of the skin care agent is low.
- the ratio of the area of the high density portion to the area of the low density portion is preferably about 2 to 20, particularly about 4 to 10.
- region 14A which is a low density part is arrange
- a row of low density portions is formed, and the row is formed in multiple rows in the orthogonal direction (Y direction) of the one direction.
- a convex region 14A that is a low density portion is formed somewhere in the orthogonal direction (Y direction).
- the convex region 14A which is a low density portion, is not formed at all in the orthogonal direction (Y direction) so that the convex region 14A, which is a low density portion of the topsheet, is removed from the human body. It is easy to make the shape follow the curved surface, and it is good for transferring the skin care agent to the skin.
- the convex region 14A which is a low density portion, forms a skin contact region that contacts the skin
- the joint region 13A which is a high density portion, is formed in a non-skin contact region that does not contact the skin. is there.
- the topsheet 10 in the present embodiment contains the skin care agent 5 in both the upper nonwoven fabric 11 and the lower nonwoven fabric 12 in the convex region 14A by the method described later. Further, when the upper nonwoven fabric 11 and the lower nonwoven fabric 12 in the convex region 14A are compared, as shown in FIG. 3, the upper nonwoven fabric 11 is more skin care per the same area than the lower nonwoven fabric 12. There is much adhesion amount of the agent 5. Further, when comparing the lower layer nonwoven fabric 12 and the joint region 13A in the convex region 14A, as shown in FIG. 3, the lower layer nonwoven fabric 12 in the convex region 14A per unit area than the joint region 13A. The amount of skin care agent 5 attached is large.
- the transferability to the skin is high and the skin care effect is high. A surface sheet is obtained. Further, by attaching a small amount of the skin care agent 5 to the lower layer nonwoven fabric 12 in the convex region 14, the skin care agent 5 in the skin contact region that comes into contact with the skin can be easily retained, and the durability of the skin care effect is improved. improves. By attaching the skin care agent 5 to the lower layer nonwoven fabric 12 in the convex region 14, the skin care agent is easily held even when the unevenness is crushed by the load of the wearer when using the diaper.
- the density of the lower layer nonwoven fabric 12 is preferably equal to the density of the upper layer nonwoven fabric 11 or higher than the density of the upper layer nonwoven fabric 11.
- the skin care agent used in the present invention those having effects such as protection and healing on the wearer's skin can be used without particular limitation.
- a diamide derivative represented by the following formula (I) described in Patent Document 3 can be mentioned.
- the diamide derivative represented by the above formula (I) is a diamide derivative of the invention described in International Publication No. WO00 / 61097, and has a medicinal effect of improving the water retention ability and barrier function of the stratum corneum. is doing.
- the diamide derivative held in the high-density part shifts to the wearer's skin during wearing of the absorbent article, it functions as an oily skin care agent and can suppress / improve skin irritation.
- the diamide derivative to be used may be only one type or two or more types.
- oily skin care agent which can be used by this invention, what is used as an emollient agent in the field
- area of cosmetics etc. can be used, for example.
- the other oily skin care agents include liquid paraffin, silicone oil, animal and vegetable oils (olive oil, jojoba oil, safflower oil, squalane and squalene, etc.), monoglyceride, diglyceride, triglyceride, aliphatic ether (myristyl-1,3 -Dimethylbutyl ether, palmityl-1,3-dimethylbutyl ether, stearyl-1,3-dimethylbutyl ether, palmityl-1,3-methylpropyl ether, stearyl-1,3-methylpropyl ether, etc.), isostearyl-cholesterol ester, paraffin wax, C 12 ⁇ C 22 fatty acids, C 12 ⁇ C 44 fatty ethers, C 12 ⁇ C 22 fatty
- the surface sheet 10 in the present embodiment is manufactured, for example, in the same manner as the method for manufacturing a surface sheet for absorbent articles described in JP-A-2004-174234, and the surface sheet 10 '
- the skin care agent is obtained by applying the skin care agent so that a large amount of the skin care agent adheres preferentially to the convex region 14A.
- a first roll 15 having a concavo-convex shape on the peripheral surface, and a concavo-convex shape engaging with the concavo-convex shape of the first roll 15.
- the upper layer nonwoven fabric 11 that does not substantially expand and contract is engaged with the second roll 16 having a shape on the peripheral surface, and the nonwoven fabric 11 is shaped unevenly. While maintaining the state in which the peripheral surface of the first roll 15 is unevenly formed, the lower layer nonwoven fabric 12 made of a sheet-like material that does not substantially expand and contract is superimposed on the nonwoven fabric 11, and the lower layer nonwoven fabric 12 Is joined to the upper nonwoven fabric 11 positioned on the convex portion of the first roll 15 to obtain a three-dimensional sheet 10 ′ having the convex portion 14.
- the upper nonwoven fabric 11 and the lower nonwoven fabric 12 are partially heated and pressurized between the convex portion of the first roll 15 and the smooth peripheral surface of the heat roll 17 to form a solid.
- a sheet 10 ' is obtained. Therefore, the obtained three-dimensional sheet 10 ′ has a high density area (joint area 13 ⁇ / b> A) having joints 13 in the plane direction and a relatively low density area (convex area 14 ⁇ / b> A) other than the joints. And have.
- the skin care agent 5 is preferentially attached to the convex region 14A of the obtained three-dimensional sheet 10 ′.
- the skin care agent 5 is sprayed on the three-dimensional sheet 10 ′ from the one surface side, and the skin care agent 5 sprayed from the other surface side of the three-dimensional sheet 10 ′.
- the air permeability in the convex area 14A having a low density is higher than the air permeability in the joint area 13A having a high density. Therefore, as shown in FIG.
- the air 6 containing 5 has a larger amount of permeation through the convex region 14A than the amount of permeation through the joint region 13A.
- a larger amount of the skin care agent 5 adheres to the convex region 14A than the joint region 13A.
- the topsheet 10 in which a larger amount of the skin care agent 5 is adhered to the convex region 14A that is the low density portion than in the joint region 13A that is the high density portion is obtained.
- various sheet materials conventionally used as a constituent material of a surface sheet in absorbent articles such as disposable diapers and sanitary napkins are not particularly limited. Can be used. For example, short fibers are formed into a web by the card method, and then made into a non-woven fabric by a method such as air-through, heat roll, resin bond, spun lace, needle punch, etc., and a long fiber is made into a non-woven fabric by a method such as heat roll or spun lace.
- the fineness of the constituent fibers is preferably 1 to 20 dtex, particularly 1.5 to 4 dtex, from the viewpoint of securing the strength of the surface sheet and improving the touch.
- the upper nonwoven fabric 11 and the lower nonwoven fabric 12, particularly the upper nonwoven fabric 11 it is preferable to use a substantially non-stretchable one.
- fibers used for the upper nonwoven fabric 11 and the lower nonwoven fabric 12 include polyolefins such as polyethylene (PE) and polypropylene (PP), polyesters such as polyethylene terephthalate (PET), and polyamides such as nylon. Synthetic fibers such as rayon, regenerated cellulose fibers such as rayon and cupra, and natural fibers such as cotton, but are not limited thereto.
- a core-sheath fiber using a fiber having a high melting point as a core and a sheath having a fiber having a low melting point as a sheath, or a composite fiber such as a side-by-side fiber, a split fiber, or the like is preferably used.
- These fibers can use 1 type (s) or 2 or more types.
- the upper nonwoven fabric 11 and the lower nonwoven fabric 12 may be the same or different.
- the fibers constituting the upper nonwoven fabric 11 and the fibers constituting the lower nonwoven fabric 12 may be the same or different.
- the convex portion 14 has a height H (see FIG. 2) of preferably 0.5 to 5 mm, particularly preferably 1 to 4 mm.
- the bottom dimension A of the convex portion 14 along the X direction (column direction) is preferably 2 to 30 mm, particularly 2 to 5 mm, and the bottom dimension B along the Y direction (direction perpendicular to the column direction) is 2 to 2 mm. It is preferably 30 mm, particularly 2 to 5 mm.
- the bottom area of the projection 14 is preferably 4 to 900 mm 2 , particularly 4 to 25 mm 2 .
- the joining length C (see FIG. 2) of preferably 0.5 to 5 mm, particularly preferably 1 to 4 mm.
- the planar view shape of the convex portion 14 is not limited to a rectangular shape, and may be other shapes such as a circle, an oval, a rhombus, and a triangle.
- column which consists of the convex part 14 and the junction part 13 in the surface sheet 10 extends was arrange
- the topsheet 10 may be arranged so that the direction (X direction) in which the row of the convex portions 14 and the joint portions 13 extends substantially coincides with the width direction of the diaper 1.
- the second to fourth embodiments of the present invention have the same configuration as that of the first embodiment except that the topsheet is different.
- the points that are not particularly described in the second to fourth embodiments are the same as those in the first embodiment.
- the top sheet 10 ⁇ / b> A in the second embodiment is made of a laminated nonwoven fabric having an upper fiber layer 18 and a lower fiber layer 19. Both fiber layers 18 and 19 are joined by embossed portions 20 arranged in a staggered manner.
- the embossed portion 20 is formed by integrally compressing the upper fiber layer 18 and the lower fiber layer 19 so that the center of the non-embossed region 21 surrounded by the non-embossed region 21 other than the embossed portion 20, particularly the four embossed portions 20. It is a high-density part having a higher density than the part 21a.
- the embossed portion 20 compressed by embossing is a high-density portion
- the non-embossed region 21, particularly the central portion 21a of the non-embossed region is a low-density portion.
- the density portion is distributed in the plane direction of the top sheet 10A.
- the topsheet 10A in the second embodiment is incorporated in a diaper with the upper fiber layer 18 side facing the skin and the lower fiber layer 19 side facing the absorber 40. Also in the disposable diaper of 2nd Embodiment, the skin care agent of the quantity larger than the embossed part 20 which is a high density part is contained in the non-embossed area
- region 21 especially center part 21a of a non-embossed area
- region which is a low density part.
- the skin care agent is contained in the low density portion where the inter-fiber gap is large, a relatively large amount of skin care agent can be held on the top sheet 10A as compared with the case where the skin care agent is contained in the high density portion.
- the skin care agent tends to adversely affect the liquid permeability such as filling the fiber gap. As described above, when the skin care agent is held in the low density portion, such a problem is unlikely to occur.
- the upper surface fiber layer 18 and the lower layer fiber layer 19 for example, the embossing roll provided with the convex part for embossing part formation in the surrounding surface, and the surface facing it
- the embossing is performed by an embossing device provided with a smooth anvil roll to form the embossed portion 20, and then the non-embossing of the laminate is performed in the same manner as the preferred manufacturing method described above for the topsheet 10 of the first embodiment. It can be manufactured by preferentially attaching a skin care agent to the region 21.
- the embossing may be compression-only embossing without heating, heat embossing, ultrasonic embossing, high-frequency embossing, or the like, but embossing performed at a temperature equal to or lower than the melting point of the fibers constituting the top sheet 10A is preferable.
- the various nonwoven fabrics described above as the nonwoven fabric of the upper layer nonwoven fabric 11 or the lower layer nonwoven fabric 12 of the first embodiment can be used.
- the skin care agent may be adhered to the two layers of the web obtained from the card or the non-nonwoven web obtained from the card superimposed on the nonwoven fabric and embossed on them. .
- the top sheet 10 ⁇ / b> B includes a lower fiber layer 22 including heat-shrinkable heat-shrinkable fibers and an upper fiber layer 23 made of non-heat-shrinkable fibers. It consists of laminated nonwoven fabric. Both the fiber layers 22 and 23 are integrated in the thickness direction by a large number of heat-sealed portions 24 partially formed by heat-sealing. Between each heat-sealing part 24, the lower layer fiber layer 22 is heat-shrinked by the shrinkage of the heat-shrinkable fiber, and the upper layer fiber layer 23 protrudes in the wearer's skin side to form a large number of convex parts 25. ing.
- the latent crimpable fiber is one that develops a helical crimp by heat treatment and shrinks.
- -Made of side type composite fiber examples thereof include those described in JP-A-9-296325 and Japanese Patent No. 2759331.
- thermoplastic polymer materials having different shrinkage rates for example, a combination of an ethylene-propylene random copolymer (EP) and polypropylene (PP) is preferably exemplified.
- the lower fiber layer 22 may be composed of 100% heat-shrinkable fibers and may contain other fibers. When other fibers are included, the amount of the heat-shrinkable fibers is preferably 50% by mass or more, particularly 70 to 90% by mass with respect to the mass of the lower fiber layer 22.
- the non-heat-shrinkable fiber contained in the upper fiber layer 23 is a fiber that does not exhibit heat-shrinkability, and exhibits heat-shrinkability, but substantially below the heat shrinkage start temperature of the heat-shrinkable fiber contained in the lower fiber layer. Includes both fibers that do not heat shrink.
- the upper fiber layer 23 includes a heat-fusible fiber containing a heat-sealing resin having a melting point T M higher than the heat shrinkage start temperature T S of the heat-shrinkable fiber contained in the lower fiber layer 22. preferable.
- the heat-sealing fiber is contained in an amount of preferably 70% by mass or more, and more preferably 80% by mass or more with respect to the mass of the upper fiber layer 23 based on the mass of the heat-sealing resin.
- the non-heat-shrinkable fibers constituting the upper fiber layer 23 are composed of 100% by mass of the heat-sealing fibers.
- the density of the lower fiber layer 22 is increased by heat shrinkage, while the upper fiber layer 23 forms a convex portion due to the heat shrinkage of the lower fiber layer 22, and accordingly, the upper fiber layer 23 Since the density tends to decrease rather, the density of the lower fiber layer 22 is the highest when compared in the region 25A (convex region) having the convex portions 25 in the planar direction, as shown in FIG.
- the density of the fiber layer 23 gradually decreases from the lower fiber layer 22 side toward the top of the convex portion, and is lowest in the top portion 25t of the convex portion.
- the topsheet 10B in the third embodiment is incorporated in a diaper with the upper fiber layer 23 side facing the skin and the lower fiber layer 22 side facing the absorber 40 side.
- the top portion 25t of the convex portion 25 is a low density portion, and the heat fusion portion 24 existing at the bottom of the concave portion located between the convex portions 25, 25 is high. It is a density part. Also in the surface sheet 10B, the high density part and the low density part are distributed in the plane direction of the surface sheet 10B. A region having a density between the density of the top portion 25t and the density of the heat fusion portion 24 is between the top portion 25t and the heat fusion portion 24 in the planar direction of the topsheet 10B. Is formed so as to surround the top portion 25t.
- the skin care agent of the quantity larger than the heat-fusion part 24 which is a high density part is contained in the top part 25t of the convex part 24 which is a low density part in the surface sheet 10B.
- the top portion 25t which is a low density portion, has a larger inter-fiber gap than the heat fusion portion 24, which is a high density portion. Since the skin care agent is contained in the low density portion where the inter-fiber voids are large, a relatively large amount of skin care agent can be retained on the topsheet 10B as compared with the case where the skin care agent is contained in the high density portion.
- the topsheet 10B in the third embodiment is a portion made of the lower fiber layer 22 that is a high-density portion in a portion 23A (particularly, the top portion 25t of the convex portion) that is a low-density portion of the topsheet 10B.
- An amount of skin care agent greater than 22A is included.
- the portion 23A composed of the upper fiber layer 23, which is a low density portion has a larger inter-fiber gap than the portion 22A composed of the lower layer fiber layer 22, which is a high density portion. Since the skin care agent is contained in the low density portion where the inter-fiber voids are large, a relatively large amount of skin care agent can be retained on the topsheet 10B as compared with the case where the skin care agent is contained in the high density portion.
- the amount of the low density portion and the high density portion distributed in the planar direction and / or the thickness direction (Z direction) of the topsheet 10B is larger than that in the high density portion. Therefore, the skincare agent can be flexibly deformed into the skin shape by using a bulky and flexible low-density part on the skin side of the wearer, and the necessary skincare agent is placed in the low density. Therefore, it is preferable because the skin care agent can be easily transferred to the entire wearing site.
- the portion having the low density portion in the planar direction has a multilayer structure
- the upper layer (upper fiber layer 23) that forms the skin contact region has an absorber side.
- a larger amount of skin care agent is applied than the lower layer (lower fiber layer 22) forming the surface. Therefore, it is possible to stably hold the skin care agent in the low density portion of the surface sheet by adjusting the resin, thickness of the fiber used for the surface sheet, and further the mixing ratio of fibers different from each other, Is preferable because the skin care agent can be easily transferred to the wearer as needed without the skin care agent being taken away by the absorber.
- the low density portion forms a skin contact region that contacts the skin, while the high density portion is formed in a non-skin contact region that does not contact the skin.
- the skin care agent can be easily transferred to the skin by gently fitting. That is, since the high-density portion is continuous in the lower layer, the low-density portion can be made sufficiently bulky and low-density by maintaining the sheet strength of the topsheet 10B, and the effect of the low-density portion can be easily exhibited. can do.
- the top sheet 10C has an upper nonwoven fabric 11 that forms a skin contact surface of the diaper (a surface directed toward the skin of the wearer) and an absorbent body 40 side. It consists of a laminated nonwoven fabric with a two-layer structure consisting of a lower layer nonwoven fabric 12 that forms the surface to be directed. As shown in FIGS. 10 and 11, in the topsheet 10 ⁇ / b> C according to the fourth embodiment, a large number of ridges 2 raised on the skin contact surface side continuously extend in the longitudinal direction (X direction) of the diaper. A groove portion 3 is formed between the adjacent flange portions 2 and 2.
- the flange portions 2 and the groove portions 3 are alternately arranged in the Y direction so as not to have a flat surface portion, the flange portions 2 are curved in a circular arc shape having a convex section in the Y direction, and the groove portions 3 are curved in a concave circular arc shape. is doing.
- the direction in which the flange portion 2 and the groove portion 3 extend is the same as the machine direction (flow direction, MD direction) at the time of manufacturing the top sheet.
- the pitch P2 of the flange part 2 and the pitch P3 of the groove part 3 in the direction perpendicular to the direction in which the flange part 2 and the groove part 3 extend are preferably 1.0 to 6.0 mm, particularly 1.7 to 3.7 mm, respectively. .
- a large number of apertures 4, 4... are formed at predetermined intervals in the longitudinal direction of the groove portion 3 in the top sheet 10 ⁇ / b> C.
- the opening 4 is formed so as to be surrounded by two layers of nonwoven fabrics 11 and 12 extending from the front surface side 10a to the back surface side 10b of the top sheet 10C.
- the inner wall 41 of the opening 4 is formed as a continuous surface from the surface 10a of the topsheet 10C. That is, the opening 4 is a three-dimensional opening.
- an opening in which the nonwoven fabric surrounding the opening 4 is cylindrical, or the diameter of the opening 4 gradually increases from the front surface side 10a toward the back surface side 10b.
- the diameter of the opening 4 gradually decreases from the front side 10a toward the back side 10b as shown in FIGS. 10 and 11.
- the opening of is preferable.
- the shape of the opening 4 is not particularly limited, and may be, for example, an elliptical, triangular, or quadrangular opening. However, as shown in FIG. This is preferable from the viewpoint that the soft feeling and the shape stability of the lower peripheral edge portion 42 of the opening 4 can be improved. Due to the fact that the opening 4 is formed by piercing a pin into a laminated nonwoven fabric without the opening 4, the density at the lower peripheral edge 42 of the strongly compressed opening 4 is not compressed or compressed. The density is higher than the density at the heel part 2, particularly the top part 26 of the heel part 2.
- the density is the density of the top sheet 10C or the laminated nonwoven fabric constituting it, but the density of the upper nonwoven fabric 11 and the lower nonwoven fabric 12 is also the density at the lower peripheral edge 42 of the aperture 4, It is higher than the density at the ridge part 2, particularly at the top part 26 of the ridge part 2.
- the upper nonwoven fabric 11 and the lower nonwoven fabric 12 are preferably such that the density of the lower nonwoven fabric 12 is higher than the density of the upper nonwoven fabric 11. Further, the density of the topsheet 10 or the laminated nonwoven fabric constituting the topsheet 10 gradually decreases from the lower peripheral edge portion 42 of the opening 4 toward the top portion 26 of the flange portion 2.
- the lower peripheral edge portion 42 of the opening 4 and the flange portion 2 are a high-density portion and a low-density portion having different densities from each other.
- a larger amount of skin care agent 5 is applied to the heel part 2 (particularly its top part 26) than the lower end peripheral part 42 of the opening 4 which is a high density part.
- the skin care agent 5 is attached to the hatched portion in FIGS. 11 and 12.
- the top sheet 10C in the fourth embodiment is incorporated in a diaper with the upper nonwoven fabric 11 side directed toward the skin and the lower nonwoven fabric 12 side directed toward the absorber 40.
- the skin care agent of the quantity larger than the lower end peripheral part 42 of the opening 4 which is a high density part is contained in the collar part 2 (especially the top part 26) which is a low density part.
- the flange portion 2 (particularly, the top portion 26), which is a low density portion, has a larger interfiber gap than the lower peripheral edge portion 42 of the aperture 4 which is a high density portion. Since the skin care agent is contained in the low density portion where the inter-fiber gap is large, a relatively large amount of skin care agent can be retained on the top sheet 10C as compared with the case where it is contained in the high density portion.
- the amount of the low density portion and the high density portion distributed in the planar direction and / or the thickness direction (Z direction) of the topsheet 10C is larger than that in the high density portion.
- the skin care agent can be effectively transferred to the skin of the wearer, and it is difficult to inhibit the relatively viscous excrement from being drawn into the absorber through the opening. It is expected that the skin care agent will be sufficiently transferred as soon as possible.
- various sheet materials conventionally used as constituent materials of the top sheet in absorbent articles such as disposable diapers and sanitary napkins are not particularly limited. Can be used.
- the various sheet materials described above can be used as the sheet-like material or nonwoven fabric constituting the two-layer nonwoven fabrics 11 and 12 of the top sheet 10 of the first embodiment.
- the two layers of nonwoven fabrics 11 and 12 may be webs that are not made into a nonwoven fabric before being laminated and integrated.
- the top sheets 10B and 10C of the third and fourth embodiments are manufactured by manufacturing a three-dimensional sheet not provided with the skin care agent 5 by a known method, and arranged on one side of the three-dimensional sheet so as to be in contact with only the surface of the three-dimensional sheet. It can be manufactured by coating the skin care agent 5 with a coated roll or the like.
- Examples of the three-dimensional sheet used for manufacturing the top sheet 10B of the third embodiment include three-dimensional sheet materials described in JP-A Nos. 2002-187228 and 2004-345357.
- the three-dimensional sheet used for manufacturing the top sheet 10C of the fourth embodiment the one described in JP-A-2004-275296 can be used.
- FIG. 13 An example of a manufacturing method of the three-dimensional sheet 10C ′ used for manufacturing the top sheet 10C will be described with reference to FIG.
- the nonwoven fabrics 11 and 12 unrolled from unillustrated raw fabric rolls are overlapped, and the overlapped nonwoven fabrics 11 and 12 are connected to the first pressing die 45 and the second pressing die 47.
- the three-dimensional sheet 10C ′ that can be preferably used for manufacturing the topsheet 10C is obtained.
- the first push die 45 for forming an opening is composed of a pin roll having a large number of pyramidal or conical convex pins 46 arranged in a row along the conveying direction, and the rows are arranged in multiple rows.
- the second pressing die 47 is constituted by a protruding roll having a protruding portion 48 fitted between the multi-row convex pins in the first pressing die 45 facing each other.
- the protrusions of the ridge roll as the second pressing die 47 being fitted between the rows of the convex pins of the pin roll as the first pressing die 45, the protrusions of the ridge roll, The flange 2 and the groove 3 that are continuous in the flow direction of the surface sheet 10 are formed, and at the same time, an opening 4 is formed in the groove 3 by penetration of the convex pins of the pin roll into the nonwoven fabrics 11 and 12. .
- the nonwoven fabrics 11 and 12 are strongly pressed to bond both. It is preferable that the convex pin is heated and the fibers are fused to each other at the lower edge portion 42.
- the formation and preferable conditions of the opening 4 using the first and second pressing dies can be the same as those disclosed in Japanese Patent Application Laid-Open No. 6-330443 related to the earlier application of the present applicant.
- the periphery of the first roll A method of transferring a skin care agent to a second roll arranged so as to be in contact with the surface, further bringing the second roll into contact with one side of the three-dimensional sheet, and transferring the skin care agent to a low density portion of the three-dimensional sheet There is.
- the coating method include a die coater method, a slot spray method, a curtain spray method, a melt blown method, a spiral spray method, a gravure method, and a bead method.
- the high density portion and the low density portion may be distributed in the planar direction in a manner different from the first and second embodiments, and are distributed in the thickness direction in a manner different from the third and fourth embodiments. May be.
- the distribution of the embossed portion in the second embodiment and the heat-sealed portion in the third embodiment is a scattered dot shape, it may be distributed in a lattice shape or the like.
- Example 1 Manufacture of three-dimensional sheet
- a three-dimensional sheet 10 ′ was manufactured using an air-through nonwoven fabric having a basis weight of 18 g / m 2 as the upper and lower nonwoven fabrics 11 and 12 and using the apparatus shown in FIG.
- the non-woven fabric 11 of the upper layer a first web manufactured by a card machine using a core-sheath type composite fiber having a core of PET, a sheath of PE, and a thickness of 2.2 dtex, and a core of PET and a sheath of PE are thick.
- the air-through nonwoven fabric is obtained by subjecting a web produced using a card machine to an air-through hot air treatment and thermally fusing the intersections of the constituent fibers.
- the density of each part of obtained solid sheet 10 was as follows.
- the total density of the convex region 14A and the total density of the joint region 13A are the thickness of the three-dimensional sheet 10 ′ in the convex region 14A (the thickness not including the thickness of the hollow portion between the nonwoven fabrics 11 and 12) and the joint region.
- the thickness of the three-dimensional sheet 10 ′ in 13A was determined by dividing by the basis weight (36 g / m 2 ) of the three-dimensional sheet 10 ′.
- the interfiber distance of the nonwoven fabric 11 which comprises the top part of the convex part 14 of three-dimensional sheet 10 ' was larger than the interfiber distance of the nonwoven fabric 11 in the junction part 13.
- composition of skin care agent Equivalent mixture of diamide derivative represented by formula (I) and stearyl alcohol (St-OH) in a mass ratio of 5: 5
- the diamide derivative represented by formula (I) is as follows: A diamide derivative represented by the formula (II) was used.
- Basis weight of skin care agent 0.5 g / m 2 Distance from 3D sheet 10 'to spray gun: 50mm Gun air pressure: 0.3 MPa Processing speed (conveying speed of the three-dimensional sheet 10 ′): 50 m / min
- the non-pressure storage sample and the surface sheet of the pressure storage sample were cut with scissors, and measurement pieces of 1 to 2 mm square were obtained from each surface sheet.
- the first measurement piece made of the upper nonwoven fabric 11 and the second measurement piece made of the lower nonwoven fabric 12 are obtained from the convex region 14A of each topsheet, and the upper nonwoven fabric from the joint region 13A.
- the 3rd measurement piece in which 11 and the lower layer nonwoven fabric 12 were integrated was obtained.
- FT-IR infrared spectroscopy
- the scan was performed by irradiating each measurement piece with infrared light from the surface side (upper side in FIG. 3) directed to the skin side.
- the high density part and the low density part of the surface sheet can be understood by examining the distance between the fibers constituting the nonwoven fabric. By measuring the distance between the respective fibers, it is possible to determine that a portion where the distance between the fibers is small is a high density portion and a portion where the distance between the fibers is large compared to that is a low density portion.
- a cut surface is formed that passes through the measurement target portion of the high density portion or low density portion of the surface sheet sample.
- a cross-section is prepared so that the structure of the sample is not destroyed by the product number FAS-10 of Feather Safety Razor Co., Ltd. or other means.
- an electron microscope observation (SEM) of this cross section is performed, and the region to be measured is imaged.
- the SEM to be used is a JEOL electron microscope JCM-5100, which is subjected to a sputtering time of 30 seconds (Pt) and an acceleration voltage of 10 KV.
- an image analysis device (NEWQUABE ver. 4.20 made by NEXT) Is used to find the distance between the nearest centers of gravity of the fibers.
- the measurement is performed almost entirely in the thickness direction of the target part, and the closest distance between the centers of gravity is not caused to overlap.
- the cross section is measured at at least 3 places, preferably 5 places, more preferably 10 places on the surface sheet, and the average value is used. In this case, the distance between the nearest centers of gravity is used to calculate the interfiber distance.
- the high-density part or the low-density part is formed by observing the same with the electron microscope as described above for the surface sheet that is compressed by embossing or the like like the surface sheet of the first or second embodiment. It is possible to calculate the density of the high-density part and the low-density part from the basis weight of the surface sheet by measuring the thickness of each measurement unit from the captured image of each part in an understandable situation.
- Infrared spectroscopy can be used as a method for measuring the amount of the skin care agent in the high density part and the low density part.
- IR Infrared spectroscopy
- the relative value is derived from the height of the infrared absorption peak derived from each skin care agent, and the amount of the skin care agent present in each is calculated by using the relationship with the amount of the skin care agent applied to the whole. be able to.
- the ATR method should be used for infrared spectroscopy. If the measurement range is sufficiently wide, any one of the absorption peaks obtained by direct measurement (macro: 2 to 3 mm) (for example, in the case of a diamide derivative) The absorption peak of the amide group (3300 cm ⁇ 1 ) can be compared. Moreover, when the site
- Measuring device Perkin Elmer Spectrum One (+ Multiscope) Macro measurement: ATR probe is measured with a single reflection using diamond Microscopic measurement: ATR probe is measured with germanium Measurement wavenumber resolution: 4 cm -1 Integration count: 4 times (macro measurement), 16 times (microscopic measurement)
- Infrared spectroscopy can also be used as a method for measuring the amount of the skin care agent in the high density part and the low density part.
- FT-IR Infrared spectroscopy
- the ratio of the peak area derived from the skin care agent to the absorption peak area derived from the surface sheet of the infrared absorption peak obtained by FT-IR is that Judgment can be made in a few places. That is, it can be seen that there are many skin care agents in which the ratio of the peak area derived from the skin care agent to the absorption peak area derived from the surface sheet exists.
- the ATR method is used for infrared spectroscopy, and any of the absorption peaks obtained by direct measurement (when a diamide derivative is applied to a PET / PE surface sheet, the sheet-derived CH absorption is obtained.
- 1400-1500Cm -1 is a peak, it is possible to compare the ratio of 1600-1670cm -1) is the absorption peak of the amide group derived from skin care agent.
- Measuring device Perkin Elmer Spectrum One Wave number resolution: 4cm -1 Integration count: 16 times
- the absorbent article of the present invention may be an absorbent article other than a disposable diaper, for example, a sanitary napkin, a panty liner, a incontinence pad, a hygiene pad, a nursing pad, and the like.
Abstract
Description
例えば、特許文献1には、表面シートに、エモリエント剤と固定化剤を含むローション組成物を、非均一パターンで適用した吸収性物品が記載されている。また、特許文献2には、複数の細片から成るパターンの形状で液体透過性トップシートにローションが付けられ、前記細片はローションが付けられていない複数の領域によって隔てられ、複数の細片から成るパターンは不連続的なパターンである、使い捨て吸収性物品が記載されている。
しかし、スキンケア効果を高める等の目的で、表面シートに多量のスキンケア剤を適用すると、表面シート本来の液透過性に悪影響を与える場合多く、スキンケア効果の一層の向上を図る観点から改良の余地があった。
図1は、本発明の第1実施形態である使い捨ておむつ1を一部破断して示す平面図である。第1実施形態の使い捨ておむつ1(以下、単におむつ1ともいう)は、図1に示すように、液透過性の表面シート10、液不透過性又は撥水性の裏面シート30及びこれら両シート間に配置された液保持性の吸収体40を備えている。
また、おむつ1は、その長手方向に、着用時に着用者の背中側に配される背側部A、股間部に配される股下部B及び腹側に配される腹側部Cを有している。
おむつ1の長手方向の両側それぞれには、撥水性不織布からなるサイドシート70が、表面シート10の両側部を覆うように配されている。表面シート10及び各サイドシート70は、吸収体40の周縁より外方において、裏面シート30に接合されている。吸収体40の側縁より外方のレッグフラップ部には、レッグギャザー形成用の弾性部材71が配されており、上述したサイドシート70のおむつ幅方向中央側の側縁には、立体ギャザー形成用の弾性部材72が配されている。
表面シート10及び後述する立体シート10’の平面方向は、それらのシートの上下両面と平行な方向である。
なお、本実施形態のように、凸部14の内部が空洞である場合、凸部領域14Aにおける表面シート10又は立体シート10’の密度は、その空洞部分の容積を、密度算出の基礎とするシートの体積に含めないで算出する。
低密度で柔軟な低密度部にスキンケア剤を保持させることにより、肌にやさしくフィットさせてスキンケア剤を肌に移行させ易くすることができる。また、低密度部が高密度部によって囲まれていることで、スキンケア剤が表面シートを不用意に移動するのを防止でき、肌に必要量を与えるのにも適している。
即ち、低密度部である凸部領域14Aが、直交方向(Y方向)に亘って全く形成されていない領域がないようにすることによって、表面シートの低密度部である凸部領域14Aを人体の曲面に形状を追従させやすくでき、スキンケア剤を肌に移行させるのに良好である。
高密度部によりシートに強度を確保すると共に非肌当接領域を形成させると共に、低密度の柔軟な領域で肌当接領域を構成し且つ該領域にスキンケア剤を多く適用することにより、肌にやさしくフィットさせてスキンケア剤を肌に移行させ易くすることができる。
また、凸部領域14における下層の不織布12にも、少量のスキンケア剤5を付着させることことにより、肌に当接する肌当接領域のスキンケア剤5が保持され易くなり、スキンケア効果の持続性が向上する。
凸部領域14における下層の不織布12にもスキンケア剤5を付着させることにより、おむつ使用時の着用者の荷重等により凹凸が潰れた際にも、スキンケア剤が保持され易くなる。
上記他の油性スキンケア剤の具体例としては、流動パラフィン、シリコーンオイル、動植物油(オリーブ油、ホオバ油、ベニバナ油、スクワランおよびスクワレン等)、モノグリセライド、ジグリセライド、トリグリセライド、脂肪族エーテル(ミリスチル-1,3-ジメチルブチルエーテル、パルミチル-1,3-ジメチルブチルエーテル、ステアリル-1,3-ジメチルブチルエーテル、パルミチル-1,3-メチルプロピルエーテル、ステアリル-1,3-メチルプロピルエーテル等)、イソステアリル-コレステロールエステル、パラフィンワックス、C12~C22脂肪酸、C12~C44脂肪酸エーテル、C12~C22脂肪アルコール、ワセリン、脂肪酸ソルビタンエステル(モノエステル、ジエステル、およびトリエステルのいずれでもよい。)、ポリオキシエチレン脂肪酸ソルビタンエステル(モノエステル、ジエステル、およびトリエステルのいずれでもよい。)、金属石験(ステアリン酸マグネシウム等)、ショ糖脂肪酸エステル、シクロデキストリン脂肪酸エステル、シリコーン、シリコーン系レジン、特許文献1又は特許文献2に記載されている発明で使用されるエモリエント剤やエモリエント剤と固定化剤を含むローション組成物等が挙げられる。
上記各種のスキンケア剤は、一種を単独で使用しても良いし、二種以上を併用しても良い。
好ましい製造方法の一例においては、先ず、図4に示すように、周面が凹凸形状となっている第1のロール15と、該第1のロール15の凹凸形状と噛み合い形状となっている凹凸形状を周面に有する第2のロール16と噛み合わせ部に、実質的に伸縮しない上層の不織布11を噛み込ませて該不織布11を凹凸賦形し、凹凸賦形した不織布11を、吸引によって第1のロール15における該周面に凹凸賦形された状態のまま保持しつつ、該不織布11に、実質的に伸縮しないシート状物からなる下層の不織布12を重ね合わせ、該下層の不織布12を、第1のロール15における凸部上に位置する上層の不織布11と接合して、凸部14を有する立体シート10’を得る。
このようにして、低密度部である凸部領域14Aに、高密度部である接合部領域13Aにおけるよりも多い量のスキンケア剤5が付着した表面シート10が得られる。尚、立体シート10’の製造方向の特に説明しない点は、特開2004-174234号公報に記載の表面シートの製造方法と同様とすることができる。
エンボス部20は、上層繊維層18及び下層繊維層19が一体的に圧縮されていることによって、エンボス部20以外の非エンボス領域21、特に4つのエンボス部20に囲まれた非エンボス領域の中央部21aに比して密度が高い高密度部となっている。即ち、表面シート10Aにおいては、エンボス加工により圧縮されたエンボス部20が高密度部で、非エンボス領域21、特に非エンボス領域の中央部21aが低密度部であり、それらの高密度部及び低密度部が表面シート10Aの平面方向に分布している。
第2実施形態の使い捨ておむつにおいても、低密度部である非エンボス領域21(特に非エンボス領域の中央部21a)に、高密度部であるエンボス部20より多い量のスキンケア剤が含まれている。低密度部である非エンボス領域21(特に非エンボス領域の中央部21a)は、高密度部であるエンボス部20に比して繊維間空隙が大きい。その繊維間空隙が大きい低密度部にスキンケア剤を含有させてあるため、高密度部に含有させる場合に比して相対的の多い量のスキンケア剤を表面シート10Aに保持させることができる。また、繊維間空隙が小さい高密度部に多い量のスキンケア剤を保持させようとした場合には、スキンケア剤が繊維間隙を埋めてしまうなど液透過性に悪影響を与えやすいが、本実施形態のように低密度部にスキンケア剤を保持させる場合には、そのような問題が生じにくい。
第2実施形態の上層繊維層18及び下層繊維層19としては、第1実施形態の上層の不織布11又は下層の不織布12の不織布として前述した各種の不織布等を用いることができる。また、カードにより得たウエブを2層重ね、あるいはカードにより得た不織布化していないウエブを不織布に重ね、それらにエンボス加工を施したものに、上述のようにしてスキンケア剤を付着させても良い。
低高密度部によりシートに強度を確保すると共に非肌当接領域を形成させ、低密度の柔軟な領域で肌当接領域を構成し且つ該領域にスキンケア剤を多く適用することにより、肌にやさしくフィットさせてスキンケア剤を肌に移行させ易くすることができる。すなわち下層に高密度部が連続しているため表面シート10Bのシート強度が保たれることで低密度部を十分な嵩高な低密度とすることができ、前記低密度部の効果を発揮させやすくすることができる。
図10及び図11に示す如く、第4実施形態における表面シート10Cにおいては、肌当接面側に隆起した多数本の畝部2が、それぞれおむつの長手方向(X方向)に連続的に延びており、隣り合う畝部2,2間は溝部3となっている。畝部2と溝部3とは、平面部を有しないようにY方向に交互に配列され、畝部2はY方向の断面が凸の円弧状に湾曲し、溝部3は凹の円弧状に湾曲している。畝部2及び溝部3が延びている方向は、表面シート製造時における機械方向(流れ方向,MD方向)と同じである。畝部2及び溝部3が延びる方向と直行する方向の畝部2のピッチP2及び溝部3のピッチP3は、それぞれ1.0~6.0mm、特に1.7~3.7mmであることが好ましい。
第3実施形態の表面シート10Bの製造に用いる立体シートとしては、特開2002-187228号公報、特開2004-345357号公報等に記載の立体シート材料等が挙げられる。第4実施形態の表面シート10Cの製造に用いる立体シートとしては、特開2004-275296号公報に記載のもの等を用いることができる。
図13に示す方法においては、それぞれ図示しない原反ロールから巻き出された不織布11,12を重ね合わせ、重ね合わせた両不織布11,12を、第1の押し型45及び第2の押し型47との間に通して開孔4を形成し、それにより、表面シート10Cの製造に好ましく用いうる立体シート10C’が得られる。
凸状ピンは加熱しておき、下端周縁部42においては、繊維同士を融着させることが好ましい。第1及び第2の押し型を用いた開孔4の形成や好ましい条件は、本出願人の先の出願に係る特開平6-330443号公報等と同様とすることができる。
例えば、スキンケア剤の塗工方法は、上記のもの以外の多様な方法を選択することができる。塗工方式としては、ダイスコーター方式、スロットスプレー方式、カーテンスプレー方式、メルトブローン方式、スパイラルスプレー方式、グラビア方式、ビード方式等が挙げられる。
高密度部と低密度部とは、第1及び第2実施形態とは異なる態様で平面方向に分布していても良く、第3及び第4実施形態とは異なる態様で厚み方向に分布していても良い。
また、第2実施形態におけるエンボス部、第3実施形態における熱融着部の分布は、散点状であったが、格子状等に分布していても良い。
(立体シートの製造)
上層及び下層の不織布11,12として、何れも坪量18g/m2のエアスルー不織布を用い、図4に示す装置を用いて、立体シート10’を製造した。上層の不織布11としては、芯がPETで鞘がPEで太さが2.2dtexの芯鞘型複合繊維を用いてカード機で製造した第1ウエブと、芯がPETで鞘がPEで太さが4.4dtexの芯鞘型複合繊維原料を用いてカード機で製造した第2ウエブとを重ね、それらに、一体的にエアスルー方式の熱風処理を施して得た多層不織布を用いた。
不織布11として用いた多層不織布は、第2ウエブ側を不織布12側に向けた。下層の不織布12としては、芯がPETで鞘がPEで太さが2.3dtexの芯鞘型複合繊維からなるエアスルー不織布を用いた。
第1のロール及び第2のロールは、ともに135℃に加熱した。エアスルー不織布は、カード機を用いて製造したウェブにエアスルー方式の熱風処理を施し構成繊維どうしの交点を熱融着させたものである。
<凸部領域14Aにおける密度>
上層不織布の密度(凸部の頂部部分の密度):0.056g/m3(厚み0.32mm)
下層不織布の密度:0.064g/m3(厚み0.28mm)
凸部領域14Aの全体密度:0.030g/m3(坪量36g/m2、厚み1.2mm)
<接合部領域13Aにおける密度>
接合部領域13Aの全体密度:0.26g/m3(坪量36g/m2、厚み0.14mm)
また、立体シート10’の凸部14の頂部部分を構成する不織布11の繊維間距離は、接合部13における不織布11の繊維間距離よりも大きかった。
製造した立体シート10’に、図5に示すようにして、下記の条件でスキンケア剤を、上層の不織布11側からスプレー塗工した。
スキンケア剤の組成:前記式(I)で表されるジアミド誘導体とステアリルアルコール(St-OH)との質量比5:5の等量混合物
前記式(I)で表されるジアミド誘導体としては、下式(II)で表されるジアミド誘導体を用いた。
立体シート10’からスプレーガンまでの距離:50mm
ガンエア圧:0.3MPa
加工速度(立体シート10’の搬送速度):50m/min
(塗布直後サンプル)
スキンケア剤塗工後の表面シートを、巻き取ることなく剥離紙間に挟んだ状態で、23℃、50%RHの環境下に保存した。
(加圧保存後サンプル)
製品としてパック保存された状態(圧縮して包装袋に充填した市販状態)を想定し、スキンケア剤塗工後の表面シート10を、図14に示すように、剥離紙81,81間に挟み、約5kPaの加圧下に3日間、40℃、80%RHの環境下に保存した。図14中、82は、台紙:坪量16g/m2 の薄紙である。そして、表面シートを取り出し、剥離紙間に挟んだ状態で23℃、50%RHの環境下に保存した。前記の5kPaは、多数のおむつを積層し、それらを圧縮して包装袋に収容したおむつの一般的な市販状態を想定したものである。
非加圧保存サンプル及び加圧保存サンプルの表面シートをはさみで切断し、それぞれの表面シートから、1~2mm角の測定片を得た。具体的には、各表面シートの凸部領域14Aから、上層の不織布11からなる第1測定片と、下層の不織布12からなる第2測定片を得ると共に、接合部領域13Aから、上層の不織布11と下層の不織布12とが一体化している第3測定片を得た。
そして、後述する第2方法〔赤外分光法(FT-IR)を用いる方法〕により、第1~第3測定片のそれぞれについて、シート由来のC-H吸収ピーク(1400-1500cm-1)の面積S2に対する、スキンケア剤由来のアミド基の吸収ピーク(1600-1670cm-1)の面積S1の比(S1/S2,図15参照)を求めた。なお、スキャンは、測定片のそれぞれについて、肌側に向けられる面側(図3の上側)から、赤外光を照射して行った。
図16に示すように、本実施例で製造した表面シートにおいては、低密度部である凸部領域14Aに、高密度部である接合部領域13Aに比して相対的に多い量のスキンケア剤が存在していることが確認された。また、凸部領域14A内においては、上層の不織布11に、下層の不織布12よりも多い量のスキンケア剤が存在していることが判る。
表面シートの高密度部位および低密度部位は不織布を構成する繊維同士の距離を調べることによりわかる。それぞれの繊維間の距離を計測することにより繊維間距離が小さい部位が高密度部、それと比較して繊維間距離が大きなものは低密度部と判断することが可能である。
表面シートの高密度部位と低密度部位におけるそれぞれのスキンケア剤の含有量を測定する方法について説明する。
高密度部位、低密度部位のスキンケア剤の量を測定する方法には赤外分光法(IR)を用いることができる。スキンケア剤が多いところと少ないところを比較する場合にはIRにより得られる赤外吸収ピークの高さの比較によりスキンケア剤が多いところと少ないところの判断が可能である。すなわち赤外吸収ピークの高い(吸収量の多い)方が存在するスキンケア剤が多いことがわかる。
また、それぞれのスキンケア剤由来の赤外吸収ピークの高さからそれぞれの相対値を導き出し、全体に塗布されたスキンケア剤の量との関係を用いることでそれぞれに存在するスキンケア剤の量を算出することができる。
赤外分光法にはATR法を用いるとよく、測定する範囲が十分に広い場合は直接測定(マクロ:2~3mm)することで得られる吸収ピークのうち任意のもの(例えばジアミド誘導体の場合はアミド基の吸収ピークである3300cm-1)を比較することができる。また、測定する部位が小さい場合には顕微(100μm)を用いると良い。
一例として上記測定の要領を下記に示した。
測定装置:パーキンエルマー社 Spectrum One (+ Multiscope)
マクロ測定:ATRプローブはダイヤモンドを用いて1回反射で測定
顕微測定:ATRプローブはゲルマニウムを用いて測定
波数分解能:4cm-1
積算回数:4回(マクロ測定)、16回(顕微測定)
高密度部位、低密度部位のスキンケア剤の量を測定する方法には、赤外分光法(FT-IR)を用いることもできる。スキンケア剤が多いところと少ないところを比較する場合には、FT-IRにより得られる赤外吸収ピークの表面シート由来の吸収ピーク面積に対するスキンケア剤由来のピーク面積比の比較によりスキンケア剤が多いところと少ないところの判断が可能である。すなわち表面シート由来の吸収ピーク面積に対するスキンケア剤由来のピーク面積比の大きい方が存在するスキンケア剤が多いことがわかる。
赤外分光法にはATR法を用い、直接測定することによりで得られる吸収ピークのうち任意のもの(PET/PE表面シートにジアミド誘導体を塗付した場合には、シート由来のC-H吸収ピークである1400-1500cm-1に対する、スキンケア剤由来のアミド基の吸収ピークである1600-1670cm-1)の比を比較することができる。
測定装置:パーキンエルマー社 Spectrum One
波数分解能:4cm-1
積算回数:16回
Claims (6)
- 液透過性の表面シート、液不透過性又は撥水性の裏面シート及びこれら両シート間に配置された吸収体を備えた吸収性物品であって、
前記表面シートは、相互に密度が異なる高密度部と低密度部とを有する不織布製シートからなり、
前記高密度部及び前記低密度部が前記表面シートの平面方向に分布しており、
前記低密度部に、前記高密度部より多い量のスキンケア剤が適用されている、吸収性物品。 - 前記表面シートは、着用者の肌側に向かって隆起した凸部と、凸部間に位置する凹部とを有しており、前記低密度部が、該凸部の頂部部分であり、前記高密度部が、前記凹部の底部に存在する、請求項1記載の吸収性物品。
- 前記凹部の底部に、複数の繊維層が接合した接合部領域を有し、前記高密度部が、該接合部領域である、請求項2記載の吸収性物品。
- 前記高密度部は、前記表面シートの平面方向の一方向において、前記低密度部間に位置しており、且つ前記一方向に直交する方向においても、前記低密度部間に位置している、請求項1~3の何れか1項記載の吸収性物品。
- 前記表面シートの平面視において、前記低密度部の面積が、前記高密度部の面積より広い、請求項1~4の何れか1項記載の吸収性物品
- 平面方向の一方向に前記低密度部が間隔を置いて配置されて低密度部の列を形成しており、該列が、前記一方向の直交方向に多列に形成されており、前記一方向の何れの位置においても、前記低密度部が該直交方向のどこかに形成されている、請求項1~3の何れか1項記載の吸収性物品。
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US20120226250A1 (en) | 2012-09-06 |
EP2505173A1 (en) | 2012-10-03 |
EP2505173B1 (en) | 2016-03-30 |
US8865965B2 (en) | 2014-10-21 |
TW201121521A (en) | 2011-07-01 |
EP2505173A4 (en) | 2014-01-08 |
CN102665633A (zh) | 2012-09-12 |
CN102665633B (zh) | 2014-07-23 |
TWI528953B (zh) | 2016-04-11 |
JP2011131044A (ja) | 2011-07-07 |
RU2527121C2 (ru) | 2014-08-27 |
RU2012126116A (ru) | 2013-12-27 |
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