JP7193223B2 - Absorbent body and absorbent article using the same - Google Patents

Description

The present invention provides an absorbent body comprising an absorbent body and a wrap material for wrapping the absorbent body, and an absorbent article in which the absorbent body is arranged between a liquid-permeable top sheet and a liquid-impermeable back sheet. Regarding.

Various absorbent articles, such as diapers for children or adults, sanitary products for women, pads for light to moderate incontinence, excrement treatment products for pets, etc., in which an absorbent is interposed between a liquid-permeable top sheet and a back sheet. Are known. In such absorbent articles, an absorbent body for absorbing and holding liquid such as urine is composed of an absorbent main body and a wrapping material. The absorbent body is mainly a mixture of fluff pulp , i.e. cellulose fibers, and super absorptive polymer, i. It consists of water-soluble tissue and thermoplastic non-woven fabric.

As examples of such absorbent articles, for example, Patent Documents 1 and 2 are known. In these, concave portions are formed on the surface of the absorbent body that is in contact with the wearer to serve as passages for body fluids such as urine, so that the body fluids can be quickly diffused and absorbed over the entire area of the absorbent body.

JP 2016-093482 A Japanese Unexamined Patent Application Publication No. 2016-214406

The present inventor believes that the wrap material is made of a soft material such as a slightly water-soluble tissue or a thermoplastic nonwoven fabric as described above, and is composed of a single layer. The present inventors have found that the material easily breaks due to deformation, and that the breakage tends to cause the material forming the absorbent main body to pop out. When forming recesses in the absorbent body of the absorbent articles disclosed in Patent Documents 1 and 2, embossing or the like is usually performed. In this case, the wrap material that covers the absorbent main body of the absorbent is also embossed together with the absorbent main body. It may break due to Therefore, in such a case, the above-mentioned problem is likely to become apparent. If the wrap material that wraps the absorbent main body is torn, the cellulose fibers and SAP that constitute the absorbent main body will pop out from the torn portion, and the shape of the absorbent main body, that is, the contour shape of the absorbent body will be lost, and the original shape of the absorbent body will be lost. There was a risk that it would not be possible to maximize the function of

An object of the present invention is to prevent breakage of the wrap material due to deformation that occurs during manufacturing, storage, or wearing of an absorbent body having recesses, and to prevent the material constituting the absorbent body from popping out due to the breakage. An object of the present invention is to provide an absorbent body which can prevent the occurrence of dust and an absorbent article using the absorbent body.

A first form of the present invention is an absorbent body comprising an absorbent main body and a wrap material wrapping the absorbent main body, wherein the wrap materials have overlapping portions, and the wrap materials are overlapped with each other. The overlapping portion is positioned on one surface side of the absorbent body, and a recess is integrally formed in the overlapping portion of the one surface of the absorbent body and the wrap material. It is something to do.

In the present invention, when an external force is applied to the absorbent body, tearing of the wrap material itself is suppressed at the overlapping portions of the wrap materials, and even if one of the wrap materials at the mutually overlapping portions is torn. Even so, the material constituting the absorbent main body is suppressed from popping out.

The position and size of the portion where the wrap material overlaps can be set as appropriate according to the location where tearing is likely to occur, but it is preferable that the surface of the absorbent body be close to the wearer's skin. In addition, from the viewpoint of sufficiently preventing the tearing of the wrap material and the jumping out of the material constituting the absorbent main body, the ratio of the area of the mutually overlapping portions of the wrap material to the area of the entire surface of one side of the absorbent main body is set to 10%. or more, more preferably 20% or more, and most preferably 50% or more.

In this case, a sheet of wrap material having a first wrap portion and a second wrap portion that are superimposed on each other to form a concave portion together with the absorbent main body, and a third wrap portion positioned on the other surface side of the absorbent main body. The wrapping material can be configured by Alternatively, a first wrap material having a first wrap portion and a second wrap portion that are superimposed on each other to form a recess with the absorbent main body, and a third wrap portion located on the other surface side of the absorbent main body. It is also possible to configure the wrap material together with the second wrap material. Alternatively, the wrap material has a first wrap portion and a second wrap portion that are overlapped with each other to form a concave portion together with the absorbent main body, and a third wrap portion that is positioned on the other surface side of the absorbent main body. It is also possible to form one wrap portion from the first wrap material and form the second wrap portion and the third wrap portion from a second wrap material different from the first wrap material.

It is preferable that the wrap material is composed of at least one of nonwoven fabric and tissue having a basis weight of 30 g/m ² or less. In this case, it is particularly effective to configure the first wrap material from a nonwoven fabric.

A second aspect of the present invention comprises a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorbent body according to the first aspect of the present invention disposed between the topsheet and the backsheet. Examples of such absorbent articles include diapers for children or adults, sanitary products for women, light and moderate incontinence pads, and excrement disposal products for pets. be able to.

In the absorbent article according to the second aspect of the present invention, recesses can also be formed integrally with the liquid-permeable top sheet.

According to the first aspect of the present invention, since the wrap material for the absorbent comprising the absorbent main body and the wrap material for wrapping the absorbent main body has portions that overlap each other, even if an external force is applied to the absorbent body, the wrap material can still be wrapped. It can make the material hard to break. In addition, even if one of the wrap materials forming the mutually overlapping portions is torn, it is possible to prevent the material forming the absorbent main body from popping out.

To sufficiently prevent tearing of a wrap material and jumping out of a material constituting an absorbent body when the ratio of the area of mutually overlapping parts of the wrap material to the area of the entire one surface of the absorbent body is set to 10% or more. can be done.

In particular, a sheet of wrap material having a first wrap portion and a second wrap portion that are overlapped with each other to form a concave portion together with the absorbent main body, and a third wrap portion located on the other surface side of the absorbent main body. , the absorbent body can be completely wrapped. As a result, it is possible to more reliably prevent the absorbent main body from losing its shape and the material constituting the absorbent main body from popping out. Alternatively, when the wrap material is composed of a first wrap material and a second wrap material, two types of wrap materials having different properties can be used depending on the purpose. Moreover, it is possible to manufacture the absorbent body more easily than using a single wrapping material.

When the wrap material is composed of at least one of a nonwoven fabric having a basis weight of 30 g/m ² or less and a tissue, it is possible to prevent deterioration of the feel due to hardening of the absorbent body. In particular, when the first wrap material that is superimposed on each other and forms the recesses together with the absorbent body is made of non-woven fabric, there is a possibility that the first wrap material will tear and absorb as the recesses are formed. The effect of suppressing the protrusion of the material forming the main body is particularly remarkable.

According to a second aspect of the present invention, a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorbent body according to the first aspect of the present invention disposed between the topsheet and the backsheet , the wrap material can be made difficult to tear even if an external force is applied to the absorber. Moreover, even if one of the wrap materials forming the mutually overlapping portions is torn, the material forming the absorbent main body is prevented from popping out.

When the concave portions are formed integrally with the liquid-permeable top sheet, the absorbent article as a whole including the absorbent body can easily bend at the concave portions when an external force is applied, and the wearability can be further improved.

1 is a three-dimensional projection view showing an appearance of an embodiment in which an absorbent article according to the present invention is applied to a tape-type disposable diaper; FIG. FIG. 2 is a partially cutaway plan view of the unfolded state of the tape-type disposable diaper shown in FIG. FIG. 3 is a three-dimensional projection view showing the tape-type disposable diaper shown in FIG. 2 in an exploded state; FIG. 3 is a cross-sectional view along the IV-IV arrow in FIG. 2; FIG. 2 is a plan view of an absorbent body used in the tape-type disposable diaper shown in FIG. 1; Fig. 2 is a cross-sectional view of another embodiment of an absorbent body according to the present invention; Fig. 4 is a cross-sectional view of another embodiment of an absorbent article according to the present invention; Fig. 3 is a cross-sectional view of yet another embodiment of an absorbent article according to the present invention; Figures 4A and 4B are cross-sectional views of different embodiments of absorbent bodies according to the present invention;

An embodiment in which the absorbent article according to the present invention is applied to a tape-type disposable diaper will be described in detail with reference to FIGS. Not limited. For example, pants-type disposable diapers, incontinence pads, etc. Various absorbents comprising a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorbent body disposed between the topsheet and the backsheet. The present invention can be applied to functional articles.

FIG. 1 shows the appearance of the tape-type disposable diaper according to the present embodiment when in use, and FIG. 2 shows the appearance of the tape-type disposable diaper when it is unfolded with the inner skin-contacting side facing up, and is further disassembled. is shown in FIG. 4 schematically shows the cross-sectional structure along the IV-IV arrow in FIG. 2, and the planar shape of the absorbent body is shown in FIG.

That is, the tape-type disposable diaper (hereinafter simply referred to as a diaper) 10 in this embodiment includes a liquid-impermeable cover sheet 11 and a back sheet 12, an absorbent body 13, a liquid-permeable top sheet 14, It has a pair of left and right side seats 15 . The backsheet 12, on which the topsheet 14 is superimposed, has substantially the same dimensions and shape as the topsheet 14, and is joined to the coversheet 11 formed of a thin nonwoven fabric in order to obtain a good feel. The absorbent body 13 is disposed between the backsheet 12 and the topsheet 14 superimposed on the backsheet 12, and the outer peripheral edge portions of the backsheet 12 and the topsheet 14 in direct contact are integrated with each other. are spliced. Both longitudinal ends of the liquid-impermeable side sheet 15 (upper and lower ends in FIG. 2) are superimposed on the upper and lower ends of the cover sheet 11, and the left and right side edges of the back sheet 12 and the top sheet 14 and the cover They are integrally joined to the sheet 11 respectively. The cover sheet 11 and the side sheets 15 have a pair of front and rear side flap portions 10f and 10r extending outward from the left and right sides of the back sheet 12 and the top sheet 14, that is, from the width direction side edges. A crotch region 10G between the front and rear side flap portions 10f and 10r is formed with a pair of arcuate recesses 10c that serve as leg openings 10t for the wearer.

In this embodiment, the inner portions (central side in FIG. 2) of the pair of left and right side sheets 15 covering the left and right sides of the top sheet 14 are not joined to the top sheet 14 . In order to form the three-dimensional gathers 15a in this inner portion, a thread rubber 16 is joined to the inner edge portion of the side sheet 15 in a stretched state.

A laterally elongated waist-surrounding elastic sheet 17 arranged along the waist-surrounding opening 10w is joined in a stretched state to the cover sheet 11 on the back body region 10R side of the diaper 10 . The waist elastic sheet 17 in this embodiment includes a base sheet 18, a plurality of rubber threads 19 joined to the base sheet 18 in a stretched state in parallel, and a base sheet 18 covering the rubber threads 19. It is composed of an upper sheet 20 that is joined to. This waist elastic sheet 17 has the function of forming a waist gather 17a to improve the fit around the wearer's waist.

Base ends of a pair of left and right fastening tapes 21 are superimposed and joined to both ends of the waist-surrounding elastic sheet 17 on both side edges in the width direction of the side flap portion 10r on the side of the back body region 10R. By overlapping the side flap portion 10r on the side of the back body region 10R with the side flap portion 10f on the side of the front body region 10F via these fastening tapes 21, the waist circumference opening 10w and the leg circumference opening 10t are formed. . The fastening tape 21 is composed of an elastic sheet that is stretchable along its width direction (horizontal direction in FIG. 2), and a hook-and-loop fastener 22 is attached to its tip. The hook-and-loop fastener 22 can be joined to the hook-and-loop fastener sheet 23 joined to the cover sheet 11 on the front body region 10F side so as to be repeatedly peelable. Therefore, by stretching the fastening tape 21 with elastic force and joining the hook-and-loop fastener 22 portion to the hook-and-loop fastener sheet 23 of the front body region 10F, the wearer's waist is constantly given an appropriate fastening force. be able to.

In addition, leg-surrounding elastic members 24 are arranged from the crotch region 10G to the front body region 10F side and the back body region 10R side along the longitudinal direction on the outside of both side edges of the absorbent body 13 . In this embodiment, the leg elastic members 24 formed of rubber thread are fixed in a stretched state between the cover sheet 11 and the side sheet 15 to form leg gathers 24a to improve fit around the wearer's legs. have the ability to improve

The absorbent body 13 in this embodiment includes an absorbent body 25 mainly composed of pulp, that is, cellulose fibers and SAP, and a poorly water-soluble core wrap, that is, a wrap material 26 that wraps the sheet-shaped absorbent body 25. Consists of

The wrap material 26 in this embodiment is composed of a non-woven fabric or tissue having a basis weight of 30 g/m ² or less. Therefore, the amount of liquid absorbed by the wrap material 26 itself is 10% or less of the amount of liquid absorbed by the entire absorber 13 . Wrapping material 26 is preferably free of binder fibers such as meltblown polymers, thermoplastic binder fibers and liquid jettable binders. The blending ratio of the binder fibers in the wrap material 26 is typically preferably less than 5%, more preferably less than 3%, and particularly preferably 0% of the dry weight of the wrap material 26. . The wrap material 26 is composed of a sheet of wrap material 26 in which a first wrap portion 27, a second wrap portion 28, and a third wrap portion 29 are continuously connected. More specifically, the first wrap portion 27 and the second wrap portion 28 are disposed between the absorbent main body 25 and the top sheet 14 in a mutually superimposed state, and the third wrap portion 29 is the absorbent sheet. It is arranged between the main body 25 and the back sheet 12 . As described above, in the present embodiment, one sheet of wrap material 26 is wrapped around the absorbent main body 25 one and a half turns in one direction. It is possible to reliably prevent the component material from jumping out. Moreover, unlike the case where the wrap material is composed of a plurality of separate pieces, it is not necessary to prepare a plurality of original rolls, and the configuration of the manufacturing apparatus can be simplified. The wrapping material 26 may be wrapped around the absorbent body 25 in the opposite direction (left-handed) to the direction shown in FIG. 4 (right-handed).

The absorbent body 13 has a front body part, a crotch part, and a back body part corresponding to these so as to reach from the front body region 10F of the diaper 10 to the back body region 10R through the crotch region 10G. In the crotch portion of the absorber 13, a pair of arc-shaped recesses 13t are formed in accordance with the pair of left and right leg openings 10t surrounding the thigh portions of both legs, and the width of the crotch portion is the same as that of the front body portion. It is narrower than the width of the back body part.

It should be noted that forming the arcuate recess 13t in the absorber 13 is not essential. Moreover, various shapes such as an elliptical shape, a circular shape, and a square shape can be adopted for the contour shape of the absorber 13 as well as the elongated shape as in the present embodiment. Furthermore, it is possible to arbitrarily change the ratio between the longitudinal direction, which is the vertical direction in FIG. 5, and the width direction, which is the horizontal direction in FIG. be.

As shown in FIGS. 2 and 4, the absorbent body 13 of the present embodiment has an embossed pattern formation region, that is, a concave formation region Z, which is regularly embossed from the surface of the top sheet 14 toward the back sheet 12 together with the top sheet 14. have _R. An embossed pattern in the form of a so-called oblique lattice is formed in the recessed region Z _R as a whole by arranging the recessed portions 30 by embossing. The specific configuration of the embossed pattern is not a feature of the present invention, and the well-known ones disclosed in Patent Documents 1 and 2, for example, can be appropriately adopted.

The recess 30 in this embodiment is formed by compressing the top sheet 14, the first and second wrap portions 27 and 28 of the wrap material 26, and the absorbent main body 25 together. In this embodiment, since the recesses 30 are formed in the mutually overlapping portions of the wrap material 26, that is, the first wrap portion 27 and the second wrap portion 28, it is easier to wear and emboss than the conventional one. It is possible to suppress tearing of the wrap material 26 and the jumping out of the material constituting the absorbent main body. Also, the shape of the concave portion 30 is easily maintained.

Further, as shown in FIGS. 2 and 5, no embossed pattern is formed on the peripheral edge of the absorbent body 13, and therefore the recessed region Z _R is not the recessed region non-formed region Z _N where this embossed pattern is not formed. It is surrounded by Due to the presence of the non-recessed area Z _N , it is possible to prevent liquid such as urine from leaking from the peripheral edge of the absorbent body 13 along the recesses 30 forming the embossed pattern. In addition, in FIG. 5, the boundary between the recessed region Z _R and the recessed non-formed region Z _N is indicated by a chain double-dashed line for the sake of convenience.

In addition, since the recess 30 is formed by compressing and joining the top sheet 14, the first wrap portion 27 and the second wrap portion 28 of the wrap material 26, and the absorbent body 25 together, the bottom surface of the recess 30 Liquids such as urine tend to be poorly absorbed from the Accordingly, the liquid flowing into the recess 30 is absorbed into the recessed region Z _R of the absorbent body 25 through the side wall of the recessed portion 30 and then penetrates into the non-recessed region Z _N .

By forming each concave portion 30 with an appropriate depth and pattern, the groove structure can be maintained even if the wearer's weight is applied, and the absorbent body 13 in the crotch region 10G of the diaper 10 is in contact with the skin. A soft texture can be maintained on the contact surface. Therefore, the oblique grid embossed pattern can suppress deformation such as twisting of the diaper 10 in response to various movements of the legs, and the soft feel of the diaper 10 can minimize irritation to the skin.

In the above-described embodiment, one sheet of wrap material 26 is wrapped around the absorbent main body 25 in one direction, but by folding in the opposite direction, the first wrap portion 27 and the second wrap portion 28 are formed. is also possible. Another embodiment of the absorbent body according to the present invention is shown in FIG. 6 with a cross-sectional structure similar to that of FIG. , redundant explanations are omitted. That is, in this embodiment, the wrap material 26 is folded back at the other end in the width direction of the absorbent main body 25, and the first wrap portion 27 and the second wrap portion 28 are overlapped. However, as shown in FIG. 7, the wrapping material 26 may be folded inward at one end in the width direction of the absorbent body 25 . Note that in this case, the vertical relationship between the first wrap portion 27 and the second wrap portion 28 is reversed. In any case, the folding position can be changed to either one end side or the other end side in the width direction of the absorbent body 25 according to the winding direction of the wrap material 26 around the absorbent body 25 . can.

However, in the embodiment shown in FIG. 6, while having the advantageous features of the embodiment shown in FIG. Manufacture of the absorbent body 13 is easier than the form.

In the above-described embodiment, the absorbent main body 25 is wrapped with one wrapping material 26, but it is also possible to wrap the absorbent main body 25 with two wrapping materials 26a and 26b. Still another embodiment of the absorbent body 13 according to the present invention is shown in FIG. 8 with a cross-sectional structure similar to that of FIG. , and redundant explanations are omitted. That is, the wrap material 26 in this embodiment is composed of a first wrap material 26a having a first wrap portion 27 and a second wrap portion 28 and a second wrap material 26b having a third wrap portion 29. there is The first wrap material 26 a is placed between the topsheet 14 and the absorbent main body 25 while being superimposed on each other to form the recess 30 together with the topsheet 14 and the absorbent main body 25 . The second wrap material 26b is arranged on the other surface side of the absorbent main body 25, that is, between the back sheet 12 and the absorbent main body 25. As shown in FIG. The first wrap material 26a in this embodiment is folded back at the other end in the width direction of the surface of the absorbent main body 25, but it is also possible to fold back at one end in the width direction of the surface of the absorbent main body 25. .

In this embodiment, since the two wrap materials 26a and 26b are used, it is possible to configure the first wrap material 26a and the second wrap material 26b with different characteristics. For example, by varying the basis weight and thickness of the first wrap material 26a so that the strength of the first wrap material 26a is higher than that of the second wrap material 26b, the first wrap material 26a can be further strengthened during embossing. It can be made unbreakable. Alternatively, when the first wrap material 26a is made of a thermoplastic nonwoven fabric and the second wrap material 26b is made of a tissue, the thermoplastic nonwoven fabric tends to undergo less deformation after embossing than the tissue. Therefore, it is possible to more reliably suppress the deformation of the concave portion 30 .

In the above-described embodiment, the two wrapping materials 26a and 26b are arranged separately on the front side and the back side of the absorbent main body 25. It is also possible to arrange them so as to overlap each other. A different embodiment of the absorbent body 13 according to the present invention is shown in FIG. 9 with a cross-sectional structure similar to that of FIG. , redundant explanations are omitted. That is, in the present embodiment, the first wrap portion 27 is made of the first wrap material 26a, and the second wrap portion 28 and the third wrap portion 29 are made of the second wrap material different from the first wrap material 26a. It is made of wrap material 26b. The second wrap material 26b is folded back at one end in the width direction of the absorbent main body 25 and overlapped with the first wrap material 26a. In this case, it is also possible to arrange the first wrap material 26a between the surface of the absorbent main body 25 and the second wrap portion 28 of the second wrap material 26b.

In this embodiment, the second wrap material 26b is folded back at one end in the width direction of the absorbent main body 25 to wrap the absorbent main body 25. Therefore, similar to the embodiment shown in FIG. Therefore, it is possible to reliably prevent the deformation of the one end of the main body 25 in the width direction. Also, by changing the size of the second wrap material 26b, the overlapping area of the first wrap portion 27 with respect to the second wrap portion 28 can be made less than 100%, and the overlapping position can be easily changed. However, from the viewpoint of sufficiently preventing the tearing of the wrap materials 26a and 26b and the jumping out of the material constituting the absorbent main body 25, the overlapping area of the first wrap portion 27 with respect to the second wrap portion 28 should be 10% or more. is preferred.

Thus, the present invention should be construed only from the matters described in the claims, and even in the above-described embodiments, all changes and modifications included in the concept of the present invention are described. other than that is possible. For example, the overlapped portion of the wrap material 26 may be three or more layers instead of two, or three or more wrap materials may be used, or the overlapped portion of the wrap material 26 may be formed on the back side of the absorbent main body 25 as well. is also possible. In other words, all matters in the above-described embodiments are not intended to limit the present invention, and may be arbitrarily changed according to the application and purpose, including configurations that are not directly related to the present invention. It is.

10 Tape-type disposable diaper (diaper)
REFERENCE SIGNS LIST 12 back sheet 13 absorbent body 14 top sheet 25 absorbent main body 26 wrap material 27 first wrap portion 28 second wrap portion 29 third wrap portion 30 concave portion

Claims (9)

An absorbent body comprising an absorbent body and a wrapping material wrapping the absorbent body, wherein the wrapping materials have mutually overlapping portions, and the mutually overlapping portions of the wrapping materials overlap the absorbent body. The wrap material and the absorbent main body are integrally formed on one surface of the absorbent main body, which is arranged over the entire surface on the side of the skin contacting side, and where the one surface of the absorbent main body and the wrap material overlap each other. an absorbent body, wherein a concave portion is formed by pressing into the inner surface of the absorbent body, and the concave portion is provided within a forming range of the overlapping portions. A recess forming region in which the recesses are regularly formed is provided within the forming range of the overlapping portion,
An embossed pattern is formed as a whole in the concave portion forming region by the arrangement configuration of the concave portions,
The embossed pattern is not formed on the peripheral edge of the absorbent body,
2. The absorbent body according to claim 1 , wherein said concave portion forming region is surrounded by a concave portion non-forming region in which said embossed pattern is not formed . The wrap material has a first wrap portion and a second wrap portion that are superimposed on each other to form the concave portion together with the absorbent main body, and a third wrap portion positioned on the other surface side of the absorbent main body. 3. The absorbent body according to claim 1, wherein the absorbent body is composed of a sheet of wrap material. The wrap material is positioned on the other surface side of the first wrap material having a first wrap portion and a second wrap portion that are superimposed on each other and form the recess together with the absorbent main body, and the absorbent main body. 3. The absorbent body according to claim 1, further comprising a second wrap material having a third wrap portion. The wrap material has a first wrap portion and a second wrap portion that are superimposed on each other to form the concave portion together with the absorbent main body, and a third wrap portion positioned on the other surface side of the absorbent main body. The first wrap portion is made of a first wrap material, and the second wrap portion and the third wrap portion are made of a second wrap material different from the first wrap material. 3. The absorbent body according to claim 1 or 2, characterized in that: 6. The absorbent body according to any one of claims 1 to 5, wherein the wrap material is composed of at least one of nonwoven fabric and tissue having a basis weight of 30 g/m<2> or less. 7. The absorbent body according to claim 6, which is dependent on claim 4 or 5, wherein the first wrap material is made of non-woven fabric. An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and the absorbent body according to any one of claims 1 to 6 arranged between the top sheet and the back sheet. An absorbent article characterized by: 8. The absorbent according to claim 8, which is dependent on any one of claims 2 to 5 and 7, characterized in that the recesses are also formed integrally with the liquid-permeable top sheet. sexual goods.

Images