JP4540601B2 - Disposable wearing items - Google Patents

Description

  The present invention relates to a disposable wearing article.

Conventionally, as a disposable diaper, a pants-type disposable diaper having a waist opening and a pair of leg openings is known. In such a disposable diaper, an elastic member is fixed between two sheets forming the opening peripheral edge of each of the pair of leg openings, and a gather is formed by the contraction force of the elastic member to It is widely practiced to improve fit.
By the way, in recent years, disposable diapers for adults are also widely used, and there is a demand that people who do not want to know the use of disposable diapers or do not want to use disposable diapers. . In addition, demands for design aspects of disposable diapers are increasing also in disposable diapers for infants.
However, in the disposable diaper in which the elastic member is fixed to the peripheral edge portion of the leg opening and the fit around the leg is improved, it is necessary to prevent the elastic member from protruding between the two sheets. Since the sheet is extended outward from the fixing position of the elastic member, the portion extending outward from the fixing position of the elastic member is arranged around the leg in a wavy state and worn. The appearance at the time was very different from underwear pants, shorts, etc., and at first glance, it appeared to be a disposable diaper.

Patent Document 1 describes a disposable undergarment having a configuration in which a sheet material forming an outer surface of an undergarment in a portion arranged around the leg of the disposable undergarment is folded and joined to the inner surface side of the undergarment.
However, the wearer may feel uncomfortable or feel uncomfortable or uncomfortable due to the folded back portion of the underwear.

Japanese Patent Laid-Open No. 62-162002

  Accordingly, an object of the present invention is to provide a disposable wearing article in which the periphery of the leg opening has an appearance close to that of underwear pants or shorts, and the wearing feeling is also good.

  The present invention is a disposable wearing article having a waist opening and a pair of leg openings, wherein a sheet material that forms an outer surface of the absorbent article at each opening peripheral edge of the pair of leg openings is the absorbent article. The object is achieved by providing a disposable wearing article that has a folded portion formed by being folded back on the inner surface side, and in which a cover member is laminated so as to straddle the inside and outside of the leading edge of the folded portion. Is.

  The disposable wearing article of the present invention has an appearance in which the periphery of the leg opening is close to underwear pants or shorts, and the wear feeling is also good.

  The present invention will be described below based on preferred embodiments with reference to the drawings. FIG. 1 is a perspective view of a pants-type disposable diaper as an embodiment of the disposable wearing article of the present invention. FIG. 2 is a plan view showing the unfolded state of the pants-type disposable diaper of FIG. FIG. 3 shows a cross-sectional view taken along the line II-II in FIG.

  The pants-type disposable diaper 1 (hereinafter also simply referred to as diaper 1) shown in FIGS. 1 to 3 includes a liquid-permeable top sheet 2, a liquid-impermeable or water-repellent back sheet (not shown), and both these sheets. It consists of a substantially vertically long absorbent main body 5 having a liquid-retaining absorbent core 3 interposed therebetween, and an outer packaging material 10 arranged on the back sheet side of the absorbent main body 5.

  The outer packaging material 10 has an hourglass shape in which the outer shape in the unfolded state is inwardly bound in the central portion in the longitudinal direction, and defines the outline of the diaper. The outer packaging material 10 is divided into an abdominal side A disposed on the wearer's ventral side, a back side B disposed on the back side, and a crotch C positioned therebetween, and both sides of the abdominal side A Edges A1 and A2 and both side edges B1 and B2 of back side B are joined together. By this joining, a pair of side seal portions 6 (only one shown), a waist opening 7 and a pair of leg openings 8 (only one shown) are formed on the left and right sides of the diaper 1. For this joining, a known joining method, for example, heat sealing, high frequency sealing, ultrasonic sealing or the like is used.

The absorptive main body 5 has a basic structure in which the top sheet 2, the back sheet, and the absorptive core 3 are integrated in the thickness direction. The side cuffs 4 and 4 are formed by disposing a liquid-resistant or water-repellent sheet material 42 fixed in an expanded state.
As for the absorptive main body 5, the surface by the side of a back surface sheet is being fixed to the outer packaging material 10 via the adhesive agent.

As shown in FIG. 3, the outer packaging material 10 has a basic structure in which two sheets 11 and 12 are laminated. As shown in FIGS. 2 and 3, the outer peripheral material 10 has an opening peripheral edge 80. A plurality of leg elastic members 81 are arranged along the peripheral edge 82. As shown in FIG. 2, each leg elastic member 81 in the diaper 1 includes a first elastic member 81 a disposed from the abdominal side A to the crotch C and a second elastic member 81 a disposed from the back side B to the crotch C. The elastic member 81b intersects, contacts, or is close to the crotch part C.
As shown in FIG. 3, the plurality of leg elastic members 81 are fixed in an expanded state between two sheets 11 and 12 constituting the outer packaging material 10 via an adhesive (not shown). In addition, the diaper 1 of this embodiment has a left-right symmetric form in the expanded view shown in FIG.

As shown in FIG. 3, the diaper 1 has a folded portion 83 formed by folding the sheet 11 forming the outer surface P of the diaper 1 on the inner surface Q side of the diaper 1 at the peripheral edge 80 of each leg opening. Have.
More specifically, both of the two sheets 11 and 12 constituting the outer packaging material 10 are folded along the outermost leg elastic member 81c of the plurality of leg elastic members 81, The folded portion 83 is formed by the folded portions 11 a and 12 a of both sheets 11 and 12. The folded portion 11a of the sheet 11 and the folded portion 12a of the sheet 12 forming the folded portion 83 are joined by an adhesive (not shown), and are opposed to the folded portion 12a of the sheet 12 and the portion 12a. The other part of the sheet 12 is joined by an adhesive 84.
Since the folded portion 83 is formed by folding the sheets 11 and 12 along the leg elastic member 81c, the peripheral edge 82 of the leg opening 8 and the leg elastic member 81c are close to each other. The distance L1 between the peripheral edge 82 of the leg opening 8 and the leg elastic member 81c (distance in the normal direction of the peripheral edge 82) L1 makes the appearance of the periphery of the leg opening close to the underwear pants and shorts. From the viewpoint, it is preferably 5 mm or less and more preferably 2 mm or less in a range extending over 50% or more (preferably 70% or more) of the entire circumference of the leg opening 8.

Moreover, in the diaper 1, as shown in FIG. 3, the cover member 85 is laminated | stacked so that the front-end edge (edge far from the peripheral edge 82) 83a of the folding | returning part 83 may be straddled.
In the normal direction of the peripheral edge 82 of the leg opening 8, the distance L2 between the position of the tip edge 83a of the folded portion 83 and the position of the end 85a on the inner side of the diaper of the cover member 85 is 5 mm or more, particularly The distance L3 between the position of the leading edge 83a of the folded portion 83 and the position of the end portion 85b on the outer side of the diaper of the cover member 85 is preferably 5 mm or more, particularly 15 mm or more. preferable. The width L4 of the folded portion (the distance between the leading edge 83a and the peripheral edge 82) can be set to, for example, 5 to 40 mm, and preferably about 10 to 30 mm.
These preferable numerical ranges are preferably satisfied in a range over a length of 50% or more (preferably 70% or more) of the entire circumference of the leg opening 8. The cover member 85 is preferably laminated over the entire circumference of the leg opening 8 as in the diaper 1, but the peripheral edge of the leg opening 8 does not directly touch the skin in a part of the entire circumference. In such a case, it is not necessary to arrange in that part.

The sheet 11 in the diaper 1 of this embodiment is an elastic sheet, and the sheet 12 is an extensible sheet. The extensible sheet only needs to be extensible in at least the width direction of the diaper (left and right direction in FIG. 2, hereinafter also referred to as the diaper width direction) when the diaper is in the unfolded state. What is necessary is just to have a stretching property in the width direction.
In the present invention, the extensible sheet means a sheet having a maximum elongation in at least one direction of 100% or more (a sheet having a length extending twice or more). The stretchable sheet is stretchable when the sheet is stretched to 100% elongation in one direction where the maximum elongation is 100% or more and then contracted (100% elongation). It means that the elongation recovery rate at the time is at least 70% or more. In the case where a plurality of directions having a maximum elongation of 100% or more are included, the stretch recovery rate is also 70% or more in only one of the directions.

[Method for measuring elongation recovery rate]
A sample piece having a length of 50 mm and a width of 25 mm is prepared, and using a Tensilon device, the sample piece is fixed at the chuck interval L _0, and the length L ₂ at the time of 100% elongation at a speed of 300 mm / min (L ₂ = L After stretching to ₀ × 2), the length of the sample piece when the stress becomes 0 after starting to return at the same speed as the tensile speed is defined as the length L ₁ after the recovery from elongation. The elongation recovery rate at 100% elongation is calculated from the following equation.
Elongation recovery rate at 100% elongation (%) = [(L ₂ −L ₁ ) / (L ₂ −L ₀ )] × 100

The stretchable sheet according to the present invention has stretchability in a direction corresponding to the width direction of the diaper even if a plurality of elastic members in the form of threads or narrow strips are not fixed in the stretched state (substantially wrinkles in the natural state). Not a sheet).
Examples of stretchable sheets having stretchability include (1) a sheet in which stretchable fiber aggregates are integrated on both sides of an elastic fiber sheet composed of elastic fiber aggregates, and (2) a net-like elastic sheet. A sheet in which an extensible fiber aggregate is integrated in a natural state on at least one surface, and (3) an elastic nonwoven fabric sheet composed only of an aggregate of elastic fibers can be preferably used.

The sheet (1) will be described.
Examples of the elastic fiber sheet comprising an aggregate of elastic fibers include styrene butadiene styrene block copolymer (SBS), styrene isoprene styrene block copolymer (SIS), styrene ethylene butylene styrene block copolymer (SEBS), and styrene ethylene propylene. Elastic raw materials such as styrene elastomers such as styrene block copolymers (SEPS), olefin elastomers, polyester elastomers, polyurethane elastomers and the like can be used singly or in combination of two or more. Examples include those obtained by (melting) this raw material into a nonwoven fabric by a spunbond method, a melt blown method, a spinning blown method, or the like.
Examples of stretchable fiber aggregates include fiber webs and non-woven fabrics produced by various manufacturing methods, in which a large number of slits extending in a specific direction are dispersed so as to be stretchable in a direction perpendicular to the specific direction.
As an integration method of the fiber sheet and the extensible fiber assembly, a method of laminating them and tangling the fibers by hydroentanglement or the like, a method of partially bonding with a pattern using an adhesive, a heat roll, or the like A state in which a part of the constituent fibers of the non-elastic fiber layer has entered the elastic fiber layer is preferable, and a method of joining by thermal fusion of fiber intersections can be mentioned. By using such a sheet for both the outer surface of the diaper and both the outer surface and the inner surface, it is possible to realize a pant-type diaper that has good elongation, is soft like a fabric, is supple, and has a smooth touch. The elastic fiber sheet preferably has fine fibers, and the spinning method is preferred as the production method.

The sheet (2) will be described.
As the net-like elastic sheet, there are a base-like sheet formed by using elastic yarn as at least a weft, a base-like sheet formed by arranging a large number of elastic bodies formed by slitting an elastic film, etc. Can be mentioned.
As the fiber assembly that can be stretched, the same fiber assembly as in the sheet (1) can be used. As an integration method of the elastic sheet and the extensible fiber assembly, the same method as the integration method in the sheet of (1) can be used. By using a net-like elastic sheet as the elastic sheet, the strength of the outer surface is high, and it is difficult to cause the outer surface to be broken when the diaper is attached or detached. However, the net-like elastic sheet is preferably flat with no irregularities in terms of touch.

The sheet (3) will be described.
As the sheet (3), an elastic fiber sheet composed of an elastic fiber assembly of the sheet (1) can be used. By using such a sheet, it is possible to realize a pants-type diaper that is easy to stretch and easy to wear.

As the cover member 85 used in the present invention, various sheet materials such as a film, a nonwoven fabric, a woven fabric, or a laminate thereof can be used, but a nonwoven fabric is preferable from the viewpoint of improvement in wearing feeling, texture, etc. The fiber diameter of the constituent fibers is preferably 0.2 to 5 dtex, more preferably 0.2 to 2 dtex. Also, the basis weight is preferably a 10~35g / m ^2, more preferably from 15-25 g / m ^2.
Moreover, as a nonwoven fabric used for the cover member 85, a heat roll nonwoven fabric, a spunbond nonwoven fabric, a nonwoven fabric (SMS, SMMS, etc.) which combined spunbond (S) and melt blown (M), an air through nonwoven fabric, a spunlace nonwoven fabric, etc. Although mentioned, an air through nonwoven fabric is especially preferable from the same viewpoint.
The sheet material used as the cover member 85 is preferably a sheet material having a better texture than the sheet material forming the outer surface of the diaper (disposable wearing article) from the same viewpoint.
The comparison of the texture of the sheet material is performed by measuring bulk softness by, for example, the following method. The smaller the bulk softness, the better the texture than the larger one.

  The cover member has a bulk softness measured by a bulk softness method of preferably 1 to 70 cN, more preferably 2 to 40 cN, and even more preferably 2 to 25 cN. When the bulk softness is less than 1 cN, the cushioning feeling of the sheet material becomes low, and when the bulk softness exceeds 70 cN, the sheet material becomes hard, so that the wearing feeling by the cover member cannot be obtained. The measuring method by the bulk softness method is described below.

<Measurement method for bulk softness>
The sheet material is cut into a rectangular shape so that the length in the length direction corresponding to the longitudinal direction of the diaper (vertical direction in FIG. 2) is 150 mm and the length in the width direction is 30 mm (for convenience of measurement, the length is long) The front and rear ends of the direction may be semicircular or trapezoidal). The cut-out rectangular sheet material 62 is formed into a cylinder (the overlapping portion at both ends is about 10 mm) so that the length direction thereof is the circumferential direction, and the overlapping portion is formed as a staple 61 [No. manufactured by Max Co., Ltd. A 10-1M needle] is used to fasten two places at intervals of 10 mm to obtain a cylindrical measurement sample 6 having a height of 30 mm (see FIG. 4A). The obtained measurement sample 6 is set in a Tensilon compression tester (manufactured by A & D, “RTC-1210A”), and compressed by the compression plate 63 at a compression speed of 10 mm / min in the axial direction of the cylinder [Fig. 4 (b)]. The initial position of the compression plate is about 32 mm, which is slightly wider than the initial sample width. The sample is compressed to a position where the measurement sample width (height) is 15 mm, and the average value (n = 3) of the maximum stress values is set as the bulk softness value.

  In the diaper 1 of the present embodiment, for example, the first elastic member 81a and the second elastic member 81b are introduced between the two belt-like sheets that are continuously conveyed while swinging in the width direction, respectively, and the outer packaging material is continuous. After manufacturing the body and forming an opening for leg opening formation surrounded by the first elastic member 81a and the second elastic member 81b in the outer packaging material continuum, A portion extending from the first elastic member 81a or the second elastic member 81b in the central direction of the opening is folded along the first elastic member 81a or the second elastic member 81b and the folded portion is pulled in the radial direction. An annular folded portion is formed by bonding via an adhesive 84, and then an annular cover member 85 is bonded onto the annular folded portion via an adhesive 86, and then the continuous body is manufactured separately. absorption By fixing the main body 5 intermittently to obtain an absorbent article continuum, folding the absorbent article continuum in half according to a conventional method, forming a side seal portion, and cutting individual absorbent articles Can be manufactured. Points that are not particularly described can be performed in the same manner as in the conventional method of manufacturing a so-called cross-flow type pant diaper.

  When the sheet material for forming the folded portion is inferior in extensibility, etc., as shown in FIG. 5A, a sheet material 83 ′ for forming the folded portion (for example, the sheet 11 and the diaper 1 in the diaper 1). It is preferable that a plurality of cuts 87 are made in the laminated member 12 and then folded along the leg elastic member 81 because the folding can be easily performed. In this case, as shown in FIG. 5B, a folded portion 83 having a plurality of cuts 87 is formed in the circumferential direction of the leg opening, but by covering with the cover member 85, the cuts 87 are formed. It is possible to cover and prevent a decrease in touch due to the cut.

  As the top sheet 2, the back sheet, the absorbent core 3, and the leg elastic member 81 in the diaper 1, those similar to those conventionally used for this type of diaper or the like can be used. For example, as the top sheet 2, a liquid permeable material such as a nonwoven fabric or an apertured film is used, and as the back sheet, a resin film, a resin film having fine holes, a leakproof material such as a water repellent nonwoven fabric, or the like. The absorbent core 3 used is composed of an aggregate of fibers such as pulp fibers or a structure in which particles of superabsorbent polymer are held and covered with tissue paper (not shown). Is used. Leg elastic member (first elastic member and / or second elastic member) is made of elastic material such as natural rubber, polyurethane resin, urethane foam resin, hot melt elastic member, etc. What was formed in (flat rubber etc.) is used preferably.

According to the diaper 1 of the present embodiment, both of the two sheets constituting the outer packaging material are folded back toward the inner surface of the diaper along the leg elastic member 81c, and thus outward from the fixed position of the elastic member 81c. The undulating sheet does not extend, and the appearance around the leg opening when worn is similar to that of underwear pants and shorts. It is possible to meet the demand not to use the appearance of a diaper, and it is also possible to improve the appearance of a disposable diaper in a disposable diaper for infants.
In addition, since the folded portion 83 is covered with the cover member 85, the folded portion 83 can prevent the wearer from feeling uncomfortable or feeling uncomfortable or uncomfortable.
Furthermore, since the material of the sheet | seat which comprises the sheet | seat which comprises the outer surface of a diaper and the cover member 85 can be varied, the freedom degree of selection of the material which can be used as a sheet | seat which forms the outer surface of a diaper improves. For example, even if a high-strength sheet such as a spunbond nonwoven fabric is used as a sheet forming the outer surface of the diaper for the purpose of preventing tearing, it is possible to prevent the wearer from feeling uncomfortable or uncomfortable.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment.
For example, the folded portion 83 in the diaper 1 described above is formed by positioning the thread-like or belt-like elastic member 81c inside the folded portion and folded along the elastic member 81c. Other than the elastic member, a thread-like or belt-like thing, for example, a polyolefin-based or polyester-based resin or a non-elastic material formed in a thread-like or belt-like shape is positioned on the inner side and folded along the member. It may be.
The cover member 85 has an arc shape on one side edge in the longitudinal direction instead of an arc shape on both side edges in the longitudinal direction, and has a linear shape on the other side edge (a shape in which a recess is formed on one side of the rectangle). Or the like).
Moreover, although the adhesive agent is preferable for the joining method to the opposing surface of a folding | returning part and the joining method to the folding | turning part of a cover member, other joining methods, such as heat sealing, can also be used. The coating method of the adhesive is preferably a coating method that is not a whole surface coating, and for example, it is preferable to coat with a pattern such as a spiral, a dot pattern, or a stripe.

  Moreover, the disposable wearing article of the present invention may be a shorts napkin or the like in addition to a pants-type disposable diaper.

It is a perspective view which shows the underpants type disposable diaper as one Embodiment of the disposable wearing article of this invention. It is a top view which shows a partial fracture | rupture and shows the expansion | deployment state of the underpants type disposable diaper of FIG. It is the II-II sectional view taken on the line of FIG. It is explanatory drawing of the measuring method of bulk softness. It is a figure which shows the formation method of the folding | turning part in another embodiment of this invention, and the lamination | stacking method of a cover member.

Explanation of symbols

1 Pants-type disposable diaper (disposable wearing article)
2 Top sheet 3 Absorbent core 5 Absorbent body 8 Leg opening 81 Leg elastic member 83 Folded portion 85 Cover member 87 Cut 10 Outer packaging material 11 Sheet for forming the outer surface

Claims (4)

A disposable wearing article having a waist opening and a pair of leg openings,
A sheet material that forms the outer surface of the disposable wearing article and another sheet material laminated on the sheet material are folded back to the inner surface side of the disposable wearing article at the opening peripheral edge of each of the pair of leg openings. A cover member is laminated so as to straddle the inside and outside of the tip edge of the folded portion,
A leg elastic member is fixed via an adhesive between the two sheet materials at the peripheral edge of each opening of the leg opening, and the leg elastic member of each of the two sheet materials is fixed. Since the portion extending outward from the arrangement position is integrally folded back to the inner surface side of the disposable wearing article, the peripheral edge of the opening of the leg opening is located at a position close to the leg elastic member. A disposable wearing article that is formed . Sheets, disposable wearing article according to claim 1, wherein the elastic sheet forming the outer surface of the disposable wearing article. Wherein the cover member is disposable wearing article according to claim 1 or 2, wherein consists good sheet material of texture than the sheet material forming the outer surface of the disposable wearing article. The disposable wearing article according to any one of claims 1 to 3 , wherein the folded portion has a plurality of cuts in a circumferential direction of the leg opening.

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