JP2024027894A - Absorbent article packaging and packaging for absorbent article packaging - Google Patents

Abstract

An object of the present invention is to suppress expansion of the absorbent article package while ensuring the absorption performance of the absorbent article in a package for an absorbent article containing a water-absorbing resin. [Solution] An absorbent article package (1) comprising an absorbent article (10) containing a water-absorbing resin and having a value obtained by dividing water retention amount by water absorption amount of 0.55 or more and a packaging material (20). The moisture permeability of the packaging material (20) is 2000 g/m2/24 h or less, and the unsealed end of the packaging material 20 along the lateral direction is located on the packaging material (20). As shown in FIG. At least one of the pair of welded areas (R50) provided on the side edge includes a plurality of welded parts (50) that intermittently join the packaging material (20), and one side in the lateral direction of the welded area (R50). It has a continuous non-welded region (R51) from the edge of the side to the edge of the other side. [Selection diagram] Figure 1

Description

The present invention relates to an absorbent article package and a package for the absorbent article package.

BACKGROUND ART Absorbent article packages in which an absorbent article is wrapped in a packaging material (packaging sheet) are known. Patent Document 1 discloses an absorbent article in which an absorbent article is folded together with a packaging sheet including an airtight layer and a fusing layer having a lower melting point than the airtight layer, and a pair of seal parts are provided on both sides of the packaging sheet. A package for an article is disclosed. In Patent Document 1, when a packaging sheet is folded, adjacent fusion layers are fused to each other, thereby increasing the airtightness of the package and suppressing the restoring force of the folded absorbent article. On the other hand, ease of opening is ensured by setting the peel strength of the seal portion to 10 N or less per 25 mm.

Patent No. 6227592

In Patent Document 1, the problem is that a folded absorbent article unfolds due to restoring force, and the airtightness of the package is improved. However, when the airtightness of the package is increased, it becomes difficult for gas to be released from the inside of the package, which may cause the package to expand and burst.
On the other hand, some absorbent product packages include light incontinence pads, disposable diapers, and other absorbent product packages that have a relatively large amount of excrement from the wearer and contain water-absorbent resins that absorb and retain excrement fluid. be. If the airtightness of such absorbent article packaging is low, moist air will easily enter from the outside, and the water-absorbent resin will swell with the moist air, causing the absorption performance of the absorbent article to decrease before use. It will drop.
As described above, in a package for an absorbent article containing a water-absorbing resin, there is a problem that is difficult to reconcile, which is not disclosed in Patent Document 1, regarding the airtightness of the package.

Therefore, the present invention has been made in view of the above-mentioned problems, and is intended to provide a package for an absorbent article containing a water-absorbing resin while ensuring the absorbent performance of the absorbent article. The purpose is to suppress the expansion of

The main invention for achieving the above object comprises an absorbent article containing a water-absorbing resin and having a value obtained by dividing the water retention amount by the water absorption amount of 0.55 or more, and a packaging material, and an absorbent article packaging body having a thickness direction, wherein the moisture permeability of the packaging material is 2000 g/m ² · 24 h or less, and the packaging material has a thickness direction when the packaging material is opened. The absorbent article is folded so that the end portion thereof is located on the packaging material, and the absorbent article packaging body contains a volatile substance and is folded so that the end portion thereof is located on the packaging material. A pair of welding areas are provided in the pair of side edges, and at least one of the pair of welding areas includes a plurality of welding parts that intermittently join the packaging material, and a plurality of welding areas that connect the packaging material intermittently, and A non-welded region that is continuous from one edge to the other edge of the absorbent article package.
Other features of the present invention will become apparent from the description of this specification and the accompanying drawings.

According to the present invention, in a package for an absorbent article containing a water-absorbing resin, expansion of the absorbent article package can be suppressed while ensuring the absorption performance of the absorbent article.

FIG. 2 is a plan view of the absorbent article package 1. FIG. 1 is a schematic cross-sectional view of an absorbent article package 1. FIG. FIG. 2 is a plan view of the absorbent article package 1 in an unfolded state, viewed from inside. FIG. 2 is a plan view of the absorbent article package 1 in an unfolded state, viewed from the outside. 1 is a schematic cross-sectional view of a light incontinence pad 10. FIG. FIG. 6A is an explanatory diagram of welding region R50, and FIG. 6B is an explanatory diagram of welding region R50 of a modified example. It is an explanatory view of the individual package 1 of a modification. It is a cross-sectional schematic diagram of the pad 10 of a modification. 9A and 9B are explanatory diagrams of a method for measuring changes in the thickness of the individual package 1. 10A to 10C are explanatory diagrams of a method for measuring changes in the thickness of the package 90.

From the description of this specification and the attached drawings, at least the following matters will become clear.
(Aspect 1)
An absorbent article comprising a water-absorbing resin and having a value obtained by dividing water retention amount by water absorption amount of 0.55 or more, and a packaging material, and having horizontal, vertical, and thickness directions. The packaging material has a moisture permeability of 2000 g/m ² ·24 h or less, and the packaging material is arranged such that the unsealed end of the packaging material along the lateral direction is located on the packaging material. The absorbent article package is folded to enclose the absorbent article, the absorbent article package contains a volatile substance, and the pair of side edges in the lateral direction are provided with a pair of welds. A region is provided, and at least one of the pair of welded regions includes a plurality of welded portions that intermittently join the packaging material, and a region that extends from one edge of the welded region in the lateral direction to the other end of the welded region. An absorbent article packaging body comprising: a non-welded region that continues to the edge.

According to aspect 1, it becomes more difficult for external moist air to permeate through the packaging material than when the moisture permeability of the packaging material is greater than 2000 g/m ² ·24 h. Furthermore, the welded region makes it difficult for a gap to be formed between the unsealed end of the packaging material and the opposing packaging material, making it difficult for external moist air to flow in from the unsealed end of the packaging material. Furthermore, since the internal pressure of the package increases due to the volatile substance, it becomes difficult for moist air to flow into the package. Therefore, it is possible to prevent the water-absorbent resin from absorbing moist air and the absorption performance of the absorbent article from decreasing before use. Further, since gas (volatile substances, etc.) inside the package can flow out from the non-weld area that is continuous in the horizontal direction in the weld area, expansion of the package due to gas can be suppressed.

(Aspect 2)
The absorbent article package according to aspect 1, wherein the unsealed end of the packaging material has an adhesive region bonded to the opposing packaging material between the pair of welded regions.

According to the second aspect, the unsealed end of the packaging material is bonded to the opposing packaging material, thereby increasing the sealing performance of the unsealed end of the packaging material. Therefore, it becomes difficult for external moist air to flow in from the unsealed end of the packaging material, and the absorbent performance of the absorbent article is ensured.

(Aspect 3)
The unsealed end of the packaging material has a non-adhesive region closer to the unsealed end in the longitudinal direction than the adhesive region, and the absorbent article package fixes the non-adhesive region to the packaging material. The absorbent article package according to aspect 2, comprising an adhesive tape.

According to aspect 3, the adhesive tape can suppress the peeling of the non-adhesive area and the peeling of the adhesive area and the welded portion. Therefore, the sealability of the unsealed end of the packaging material is ensured, the inflow of moist air from the outside can be suppressed, and the absorbent performance of the absorbent article is ensured.

(Aspect 4)
The absorbent article package according to aspect 2 or 3, wherein at least one of the pair of welded regions has a region that overlaps with the adhesive region in the thickness direction.

According to aspect 4, the bonding strength of the welded region is increased by the welded portion and the adhesive region, so that the sealing performance of the unsealed end of the packaging material is improved, and unintended opening can be suppressed. Therefore, the sealability of the unsealed end of the packaging material is ensured, the inflow of moist air from the outside can be suppressed, and the absorbent performance of the absorbent article is ensured.

(Aspect 5)
Any one of Aspects 1 to 4, wherein the volatile substance is coated on at least one of a material constituting the absorbent article and an inner surface of the packaging material. The absorbent article package described in .

According to aspect 5, volatile substances are gradually volatilized from the materials constituting the absorbent article and the packaging material, and the sustainability of the volatile substances is increased. Therefore, the period during which the internal pressure of the package is high due to the volatile substance becomes longer, and the effect of suppressing the inflow of external moist air from the non-welded area becomes more likely to persist.

(Aspect 6)
The absorbent article package according to any one of aspects 1 to 5, wherein at least one of the pair of welded areas has the non-welded area that is continuous along the lateral direction.

According to the sixth aspect, the volatile substance easily flows out smoothly through the non-welded region that continues linearly in the lateral direction. By appropriately releasing volatile substances from the package, expansion of the package due to the volatile substances can be suppressed.

(Aspect 7)
The length of the non-welded region in the longitudinal direction is longer than 1/2 of the length of the welded portion adjacent to the non-welded region on one side in the longitudinal direction. The absorbent article package according to aspect 6.

According to aspect 7, the length of the non-welded region in the vertical direction can be ensured, volatile substances can be appropriately released from the non-welded region, and expansion of the package due to volatile substances can be suppressed.

(Aspect 8)
The absorbent article package according to any one of aspects 1 to 7, wherein the volatile substance has higher volatility than menthone glycerin acetal.

According to aspect 8, compared to the case where the volatile substance is menthone glycerin acetal, the internal pressure of the package can be increased by the volatile substance from an early stage, and the inflow of moist air from the outside can be suppressed.

(Aspect 9)
The absorbent article package according to any one of aspects 1 to 8, wherein the volatile substance has lower volatility than menthone glycerin acetal.

According to aspect 9, the persistence of the volatile substance is higher than when the volatile substance is menthone glycerin acetal, and the internal pressure of the package can be increased by the volatile substance over a long period of time, and can suppress the inflow of humid air.

(Aspect 10)
The absorbent article packaging according to any one of aspects 1 to 9, wherein the packaging material has an oxygen permeability in the thickness direction of 100 cc/m ² /24 h/atm or less at 23° C. body.

According to aspect 10, compared to a case where the oxygen permeability of the packaging material is greater than 100 cc/m ² /24 h/atm at 23° C., it becomes difficult for humid air to pass through the packaging material and flow in from the outside. Therefore, the absorbent performance of the absorbent article is ensured.

(Aspect 11)
According to any one of aspects 1 to 10, the absorbent article has an absorbent core, and an oil agent is disposed closer to the skin than the absorbent core. The absorbent article package described above.

According to aspect 11, the moist air that has flowed into the inside of the package becomes difficult to flow into the inside of the absorbent core due to the oil agent. Therefore, the absorbent performance of the absorbent article is ensured.

(Aspect 12)
The absorbent article package according to any one of aspects 1 to 11, wherein the outer surface of the packaging material has lower smoothness than the inner surface of the packaging material.

According to aspect 12, since the outer surface of the packaging material has low smoothness and a high coefficient of friction, movement of the packaging body can be reduced during distribution or when being carried by a user. Therefore, unintended opening of the package can be suppressed, moist air is difficult to enter from outside the package, and the absorbent performance of the absorbent article is ensured.

(Aspect 13)
The absorbent article package according to any one of aspects 1 to 11, wherein the inner surface of the packaging material has lower smoothness than the outer surface of the packaging material.

According to aspect 13, when the inner surface of the packaging material has low smoothness and large irregularities, volatile substances tend to fill the recesses. Therefore, it becomes difficult for moist air to flow in from the outside of the package, and the absorbent performance of the absorbent article is ensured.

(Aspect 14)
A package of an absorbent article package in which the absorbent article package according to any one of aspects 1 to 13 is housed in a bag, wherein the thickness of the absorbent article package inside the bag is , the length of the package in the natural state in the predetermined direction is T1, and the length of the package when the package is pressed in the predetermined direction with a force of 1000 N/m ² . The length in the predetermined direction is T2, the length in the thickness direction of the absorbent article package in the natural state is t1, and the absorbent article package is applied with a force of 1000 N/m ² in the thickness direction. An absorbent article characterized in that (T1-T2)/T1<(t1-t2)/t1, where t2 is the length of the absorbent article package in the thickness direction when pressed. package of packaging.

According to aspect 14, a package that directly contains a volatile substance has a larger rate of change in thickness and gas is more easily released, so that expansion of the package can be suppressed more reliably. On the other hand, in a package, by reducing the rate of change in thickness to make it difficult for gas to be released and increase the internal pressure, it becomes difficult for moist air to flow in from the outside. As a result, it is possible to further suppress a decline in the absorbent performance of the absorbent article housed in the package.

===Embodiment===
Hereinafter, as an example of the absorbent article package according to the present embodiment, an individual package for a light incontinence pad will be described as an example.

<<Basic configuration of absorbent article package 1>>
FIG. 1 is a plan view of the absorbent article package 1. FIG. FIG. 2 is a schematic cross-sectional view of the absorbent article package 1. FIG. FIG. 3 is a plan view of the absorbent article package 1 in the unfolded state, viewed from inside. FIG. 4 is a plan view of the absorbent article package 1 in the unfolded state, viewed from the outside. FIG. 5 is a schematic cross-sectional view of the light incontinence pad 10.

The absorbent article package 1 (hereinafter also referred to as "individual package 1") includes a light incontinence pad 10 (hereinafter also referred to as "pad 10"), which is an absorbent article, and a packaging material 20. In the folded state (FIG. 1), the individual package 1 has a horizontal direction, a vertical direction, and a thickness direction that are orthogonal to each other.

The packaging material 20 is a rectangular sheet, as shown in FIG. Corresponds to the longitudinal direction. The pad 10 is placed on the inner surface of the packaging material 20 via a release sheet 60, and the packaging material 20 is folded together with the pad 10 at two folding portions F1 and F2 along the lateral direction of the individual packaging body 1. .

However, the invention is not limited to the above, and for example, the packaging material 20 and the pad 10 may be folded separately. Further, a plurality of pads 10 may be included in one packaging material 20. Furthermore, the packaging material 20 and the pad 10 may be folded at three or more folds along the lateral direction, or both the lateral folds and the longitudinal folds of the packaging material 20 may be folded. It may be folded at the folding part.

A pair of side edges in the lateral direction of the packaging material 20 folded together with the pad 10 are intermittently joined and sealed by a plurality of welds 50. As a method for forming the welded portion 50, a well-known welding method such as ultrasonic welding or thermal welding can be used. In the following description, a region where a plurality of welded portions 50 are provided at a pair of side edges in the lateral direction of the individual package 1 will be referred to as a "pair of welded regions R50." The welding region R50 extends along a vertical line passing through the most horizontal end of the plurality of welded parts 50 and a vertical direction passing through the othermost horizontal end of the plurality of welded parts 50. line, a line along the horizontal direction passing through one end of the plurality of welded parts 50 in the vertical direction, and a line along the horizontal direction passing through the othermost end of the plurality of welded parts 50 in the vertical direction. , is a rectangular area surrounded by .

The release sheet 60 is a rectangular sheet, and is provided between the pad 10 and the packaging material 20 so as to cover the entire area of the anti-slip adhesive portion 18 of the pad 10. The release sheet 60 is unremovably fixed to the inner surface of the packaging material 20 by a fixing part 61 coated with, for example, hot melt adhesive. In FIG. 4, three fixing parts 61 are arranged side by side at intervals in the longitudinal direction of the packaging material 20, but the shape, number, and arrangement position of the fixing parts 61 are not particularly limited. Furthermore, the inner surface of the release sheet 60 (the surface facing the pad 10) is subjected to a release process using silicone resin or the like, so that the anti-slip adhesive portion 18 of the pad 10 can be easily removed. Therefore, when the pad 10 is used, the release sheet 60 is removed from the pad 10 together with the packaging material 20.

<<Basic configuration of pad 10>>
In the unfolded state, the pad 10 has a lateral direction, a longitudinal direction, and a thickness direction that are orthogonal to each other. The lateral direction of the pad 10 corresponds to the lateral direction of the individual packaging body 1, and the longitudinal direction of the pad 10 corresponds to the vertical direction of the individual packaging body 1 (the longitudinal direction of the packaging material 20). Further, in the thickness direction of the pad 10, the side that contacts the wearer's skin is called the skin side, and the opposite side is called the non-skin side. In this embodiment, since the pad 10 has a configuration and shape that are symmetrical in the longitudinal direction, one side in the longitudinal direction of the pad 10 may be the ventral side or the dorsal side of the wearer. .

As shown in FIG. 5, the pad 10 includes a first absorbent core 30, a second absorbent core 40 located closer to the skin than the first absorbent core 30, and a second absorbent core 40 located closer to the skin than the first absorbent core 30. The topsheet 11 , the intermediate sheet 12 located between the topsheet 11 and the first absorbent core 30 , a pair of first sidesheets 13 , a pair of second sidesheets 15 , and a lower layer than the second absorbent core 40 . It has a back sheet 16 located on the skin side.

The top sheet 11 and the intermediate sheet 12 are liquid permeable sheets. Examples of liquid-permeable sheets include nonwoven fabrics (for example, air-through nonwoven fabrics and spunbond nonwoven fabrics), synthetic resin films having through holes, and the like. The back sheet 16 is a liquid-impermeable sheet. Examples of liquid-impermeable sheets include synthetic resin films such as polyethylene (PE) and polypropylene (PP), composite sheets of synthetic resin films and nonwoven fabrics, and the like. Examples of the first side sheet 13 and the second side sheet 15 include hydrophobic sheets (such as nonwoven fabric containing hydrophobic fibers), but they are not particularly limited. Although not all are shown in order to avoid complication of the drawings, materials adjacent in the thickness direction are bonded to each other with an adhesive such as a hot melt adhesive.

The first absorbent core 30 includes a first absorbent core 31 , a first skin-side core wrap 32 , and a first non-skin-side core wrap 33 . The first absorbent core 31 is made of super absorbent polymer (SAP) and has a rectangular shape in plan view as shown in FIG. 3 . The first skin-side core wrap 32 and the first non-skin-side core wrap 33 are liquid-permeable sheets, and can be made of nonwoven fabric or the like. Both ends of the first skin-side core wrap 32 in the lateral direction wrap around both ends of the first absorbent core 31 and the first non-skin side core wrap 33 in the lateral direction. Part of the side is folded back.

A pair of first side sheets 13 are arranged so as to wrap around both horizontal edges of the first absorbent core 30, intermediate sheet 12, and top sheet 11 from both horizontal ends of the non-skin side surface of the first absorbent core 30, respectively. It is then folded back toward the skin side and fixed onto the skin side surface of the topsheet 11 with a hot melt adhesive HMA1. A single rubber thread 14 that expands and contracts in the longitudinal direction is arranged at the edge of the first side sheet 13 in the lateral direction. Due to the contraction of the rubber thread 14, both ends of the first side sheet 13 and the like in the lateral direction tend to stand up on the skin side. Specifically, the first side sheet 13 can easily stand up starting from the portion fixed to the second side sheet 15 with the hot melt adhesive HMA2, and side leakage of excrement can be suppressed.

The second absorbent core 40 includes a second absorbent core 41 , a second skin-side core wrap 42 , and a second non-skin-side core wrap 43 . The second absorbent core 41 is made by molding liquid absorbent fibers such as pulp fibers into a predetermined shape, to which a super absorbent polymer (SAP) is added. As shown in FIG. 3, the second absorbent core 41 has a substantially rectangular shape with curved longitudinal ends, and is longer than the first absorbent core 31 in the longitudinal direction. The second skin-side core wrap 42 and the second non-skin side core wrap 43 are liquid-permeable sheets, and tissue, nonwoven fabric, or the like can be used. Both lateral ends of the second skin-side core wrap 42 are folded back onto a portion of the skin side surface of the second non-skin-side core wrap 43 so as to wrap around both lateral edges of the second absorbent core 41. There is.

The pair of second side sheets 15 are each located between the first side sheet 13 and the second absorbent core 40, and extend outward in the horizontal direction from the horizontal ends of the second absorbent core 40. The extended portion is bonded to the backsheet 16 with an adhesive (not shown), thereby suppressing the exudate absorbed by the second absorbent body 40 from seeping out.

A non-skin side surface of the pad 10 (a non-skin side surface of the back sheet 16) is provided with an anti-slip adhesive portion 18 coated with hot melt adhesive or the like. The anti-slip adhesive part 18 is attached to the skin side of the wearer's underwear, and the pad 10 is used while being fixed to the underwear. In FIG. 4, two long rectangular anti-slip adhesive parts 18 are arranged in the longitudinal direction of the pad 10 at intervals in the horizontal direction, but the shape, number, and position of the anti-slip adhesive parts 18 are , but is not particularly limited.

Although the basic configuration of the pad 10 has been described above, the configuration of the pad 10 described above is an example and is not limited thereto. For example, pad 10 may have a longitudinally asymmetrical configuration or shape. Further, the pad 10 may have a single-layer absorbent body in which a plurality of absorbent bodies are not stacked in the thickness direction.
In addition, in the following description, the first absorbent core 30 and the second absorbent core 40 are collectively referred to as the absorbent cores 30 and 40, and the first absorbent core 31 and the second absorbent core 41 are collectively referred to as the absorbent core 31. , 41.

=== Regarding the absorption performance of the pad 10 and the expansion of the individual package 1 ===
FIG. 6A is an explanatory diagram of welding region R50, and FIG. 6B is an explanatory diagram of welding region R50 of a modified example. FIG. 7 is an explanatory diagram of an individual package 1 of a modified example. FIG. 8 is a schematic cross-sectional view of a pad 10 of a modified example.

The absorbent cores 31 and 41 included in the pad 10 contain a water absorbent resin (superabsorbent polymer) that retains absorbed liquid. Note that, as the water-absorbing resin, in addition to super-absorbent polymer (SAP), absorption fibers and the like can be exemplified. In the pad 10 containing a water-absorbing resin, the ratio of the "water retention amount" (the amount of water that the absorbent article can retain) to the "water absorption amount" (the amount of water that the absorbent article can absorb) increases. Therefore, in the light incontinence pad 10, disposable diaper, and the like of this embodiment, which have a larger amount of excrement than absorbent articles for sanitary use, the water-absorbing resin can suppress leakage of absorbed excrement fluid.

However, in individual packaging for absorbent articles with high water retention capacity, if the individual packaging is not airtight and humid air easily flows in from the outside, the water-absorbing resin absorbs and retains the moisture from the humid air. Therefore, there is a problem that the absorption performance (water retention performance) of the absorbent article decreases before use. In particular, when individual packages are distributed in humid areas for long periods of time or stored in high humidity environments such as bathrooms, the problem of reduced absorption performance becomes significant.
On the other hand, if the airtightness of the individual package is made too high, it will be difficult for gas to be released from the inside of the individual package, and there is a risk that the individual package will expand and burst.

Therefore, in the present embodiment, the pad 10 includes a water absorbent resin and has a high water retention amount, specifically, the value obtained by dividing the water retention amount by the water absorption amount is 0.55 or more (water retention amount/water absorption amount≧0.55). In the individual package 1 of the pad 10, the following procedure is performed. Note that the absorbent article with a high water retention capacity is not limited to a light incontinence pad, and may be, for example, a urine absorbing pad, a disposable diaper, or the like.

First, the moisture permeability of the packaging material 20 is set to 2000 g/m ² ·24 h or less. By doing so, the packaging material 20 becomes difficult for external moist air to permeate in the thickness direction, compared to a case where the moisture permeability of the packaging material is greater than 2000 g/m ² ·24 h. Therefore, it is difficult for humid air to flow into the interior of the individual package 1, and the superabsorbent polymer included in the pad 10 absorbs and retains the moisture in the humid air, resulting in a decrease in the absorption performance of the pad 10 before use. can be suppressed.

Moreover, the end 20a on one side in the longitudinal direction of the packaging material 20 is located on the outer surface of the individual packaging body 1 in the state of being folded by the two folding parts F1 and F2 along the horizontal direction, and is located on the outer surface of the individual packaging body 1. This becomes the unsealing end 20a that is the starting point for unsealing. Further, as shown in FIG. 2, in the folded state of the packaging material 20, one longitudinal end 20a (unsealed end) of the packaging material 20 is the other longitudinal end of the packaging material 20. It overlaps the portion 20b in the thickness direction, and the pad 10 is not interposed therebetween. That is, the packaging material 20 is folded with the pad 10 inside so that the unsealed end 20a of the packaging material 20 along the lateral direction is located on the packaging material 20.

In this case, since the pad 10 does not face the unsealed end 20a of the packaging material 20, it is unlikely to come into contact with external moist air at the unsealed end 20a. Furthermore, a pair of lateral side edges of the packaging material 20 are joined by a pair of welded regions R50 (a plurality of welded parts 50). Therefore, even between the pair of welded regions R50, the unsealed end 20a of the packaging material 20 is likely to come into contact with the opposing portion (20b) of the packaging material 20, making it difficult to form a gap. Therefore, it becomes difficult for external moist air to flow in from the unsealed end 20a of the packaging material 20. As a result, the superabsorbent polymer included in the pad 10 absorbs and retains moisture from humid air, and the absorbent performance of the pad 10 can be prevented from deteriorating before use.

Further, as shown in FIG. 6A, the pair of welded regions R50 includes a plurality of welded portions 50 that intermittently join the packaging materials 20, and an end edge from one end of the welded region R50 in the lateral direction to the other end in the lateral direction. It has a non-welded region R51 that continues up to. That is, the welded region R50 has a non-welded region R51 that serves as a gas passage from the inside to the outside of the welded region R50 in the lateral direction, and has a welded portion 50 that continues over the entire length of the individual package 1 in the vertical direction. I don't. Therefore, the gas inside the individual package 1 can flow out of the individual package 1 through the non-welded region R51 and the weld region R50. Therefore, expansion of the individual packages 1 can be suppressed, and bursting of the individual packages 1 can be prevented.

In addition, in this embodiment, although the welding pattern of a pair of welding area|region R50 is the same, it is not limited to this. The pair of welding regions R50 may have different welding patterns, and for example, only one of the welding regions R50 may have a non-welding region R51 that continues in the lateral direction. In this case as well, the gas inside the individual package 1 may can be released to the outside. However, as in the present embodiment, if both of the pair of welded regions R50 have a non-welded region R51 that is continuous in the lateral direction, the gas inside the individual packaging 1 can more easily flow out to the outside, and the individual packaging can be more securely separated. Expansion of the package 1 can be suppressed.
Further, the welded region R50 only needs to have at least one non-welded region R51 that is continuous in the lateral direction. However, as shown in FIG. 6A, by providing a plurality of horizontally continuous non-welding regions R51 intermittently in the vertical direction, the gas inside the individual packaging body 1 easily flows out to the outside, and the individual packaging body is more securely wrapped. Expansion of the body 1 can be suppressed.

Further, the inside of the individual package 1 contains volatile substances. For example, in the pad 10 of this embodiment, as shown in FIG. 5, a cooling agent 71, which is a volatile substance, is coated on the non-skin side of the top sheet 11. Further, a fragrance 72, which is a volatile substance, is coated on the inner surface of the folded portion of the first skin-side core wrap 32 toward the non-skin side. Further, the solvent contained in the hot melt adhesive that fixes the release sheet 60 to the packaging material 20 or joins the materials forming the pad 10 is also a volatile substance.

In this case, the inside of the individual package 1 is filled with volatile substances (volatile gas), the internal pressure of the individual package 1 increases, and it becomes difficult for moist air to flow in from the outside. On the other hand, if a volatile substance is contained inside the individual package 1, the individual package 1 will be likely to expand due to the sequentially volatilized gas. However, in the pad 10 of this embodiment, volatile substances can be released from the non-welding region R51 (gas path). In other words, the volatile substances inside the individual packaging body 1 are released from the non-welding region R51, thereby suppressing the expansion of the individual packaging body 1, and allowing the moist air from outside to pass through the non-welding region R51 to the individual packaging body. It becomes difficult to flow into the body 1. As a result, the individual package 1 is prevented from bursting, and the superabsorbent polymer included in the pad 10 absorbs and retains moisture from humid air, preventing the absorbent performance of the pad 10 from decreasing before use. It can be suppressed.
As described above, according to the individual package 1 of this embodiment, the expansion of the individual package 1 can be suppressed while ensuring the absorption performance of the pad 10.

Here, a method for measuring the "water absorption amount" and "water retention amount" of the pad 10 will be explained. In this embodiment, the amount of water that can be retained even when the pad 10 is dehydrated at 150G is defined as the "water retention amount".
As a measuring method, first, the weight A0 (g) of the pad 10 to be measured is measured. Thereafter, with the skin side of the pad 10 facing downward, the pad 10 is immersed in approximately 20 L of physiological saline (0.9% NaCl solution) while being pressed by hand. Note that physiological saline can be used to measure up to six pads 10, but after that the concentration will change and it will be necessary to replace it. After soaking the pad 10, it is left in that state for 30 minutes. After 30 minutes, the pad 10 is taken out and placed on a net with the skin side facing down.An acrylic plate and two 5 kg weights are placed on top of it and left for 20 minutes. After 20 minutes, the weight A1 (g) of the pad 10 is measured, and the difference from the initial weight is defined as the "water absorption amount" (A1 (g) - A0 (g)).
Next, the pad 10 whose water absorption amount has been determined by performing the above treatment is placed in a dehydrator, set so that the skin side of the pad 10 faces outward, and dehydrated at 150 G for 90 seconds. Note that the number of pads 10 that can be set in the dehydrator at the same time is limited to three, and the pads are arranged so that they do not overlap. After dehydration, the weight A2 (g) of the pad 10 is measured, and the difference from the initial weight is defined as the "water retention amount" (A2 (g) - A0 (g)).
Note that it is preferable to measure the water absorption amount and water retention amount for a plurality of pads 10, and in that case, the average value of the water absorption amount and the average value of the water retention amount of the plurality of pads 10 is employed.

Further, the moisture permeability of the packaging material 20 is measured in accordance with the moisture permeability test method for moisture-proof packaging materials (cup method) of JIS Z 0208:1976. After filling a moisture-permeable cup with 20 cc of water instead of calcium chloride, covering it with the target packaging material 20, and leaving it for 24 hours under atmospheric conditions of a temperature of 40 ° C. and a relative humidity of 60%, The permeation amount (discharge amount) of moisture per unit area (m ² ) is measured.

Furthermore, the entire area of the welded portion 50 of this embodiment is welded. Therefore, the bonding strength between the packaging materials 20 at the welded portion 50 is high. Therefore, in the individual package 1 of this embodiment, although the internal pressure is increased by the volatile substance, unintended peeling of the welded portion 50 (welded region R50) before use of the individual package 1 can be prevented, and the Airtightness is ensured. Note that within the welding portion 50, the welding strength may be constant, or there may be a mixture of regions having different welding strengths.
However, the welded part 50 includes not only the actual welded parts, but also the parts where the packaging materials 20 are joined (integrated) together due to the influence of adjacent welded parts, and the outer periphery due to the welded parts. The welded portion 50 also includes the area where most of the area is surrounded. Since it is difficult for gas to pass through these parts, the area including these parts is set as the welded part 50, and the non-welded area R51 other than the welded part 50 is secured as a passage for gas, so that the individual package 1 can expand. can be suppressed.

In addition, although the cooling agent 71 (for example, menthol, menthyl lactate, etc.), fragrance 72, and hot melt adhesive are exemplified as volatile substances contained inside the individual package 1 of this embodiment, volatile substances The substance is not particularly limited. For example, it may be a warming agent, an insect repellent, a Chinese herbal medicine, a skin astringent, an anti-inflammatory agent, an antibacterial agent, a pH adjuster, a humectant, or the like. Further, it may be a volatile substance that adds a predetermined function (for example, a cooling sensation or a scent) to the pad 10 (absorbent article), or it may be a volatile substance that adds a predetermined function (for example, a cooling sensation, a fragrance, etc.) to the pad 10 (absorbent article). It may also be a volatile substance contained. When the individual packaging body 1 contains a volatile substance that adds a predetermined function to the pad 10, as described above, the moisture permeability of the packaging material 20 may be suppressed or the sealing performance of the unsealed end 20a of the packaging material 20 may be reduced. The volatilization of volatile substances (outflow of volatilized gas) can be moderately suppressed by increasing the. Therefore, the function of the volatile substance is exhibited while the pad 10 is in use.

Further, the packaging material 20 preferably has an oxygen permeability in the thickness direction of 100 cc/m ² /24 h/atm or less at 23°C. Preferably it is 60 cc/m ² /day/atm or less, more preferably 40 cc/m ² /24 h/atm or less, still more preferably 30 cc/m ² /24 h/atm or less.
The above oxygen permeability is measured under the conditions of 23° C. and 0% RH according to the coulometric method.

In the above case, compared to the case where the packaging material 20 with oxygen permeability higher than 100 cc/m ² /24 h/atm at 23° C. is applied, the airtightness of the individual packaging body 1 is increased, and moist air is absorbed into the packaging material. 20 becomes difficult to pass through, and a decrease in the absorption performance of the pad 10 can be suppressed. In addition, if the individual package 1 contains a volatile substance that adds a predetermined function (for example, cooling sensation, fragrance, etc.) to the pad 10, the volatilization of the volatile substance (outflow of the volatilized gas) is moderately suppressed. The volatile substance functions during use of the pad 10.

For the packaging material 20 having an oxygen permeability of 100 cc/m ² /24 h/atm or less at 23° C., an airtight layer is provided between the welding layers containing a welding substance that enables the packaging materials 20 to be welded together. I can give an example of a sheet.
The material for the airtight layer may be any material known in the art without limitation as long as it can maintain airtightness in the thickness direction, such as ethylene vinyl alcohol copolymer, vinylidene chloride polymer, etc. Examples include vinylidene chloride methyl acrylate copolymer, polyvinyl alcohol, nylon, such as nylon 6, aluminum foil, and those in which alumina, silica, etc. are deposited on a base film (polyethylene terephthalate, etc.).
As the material of the welding layer, any material known in the art can be used without limitation as long as it can form the welded portion 50, and examples thereof include polyethylene and polypropylene.
However, the packaging material 20 is not limited to the above, and may be any packaging material 20 that includes a material capable of forming the welded portion 50 and has a moisture permeability of 2000 g/ ^m2.24 h or less. For example, polyethylene (PE) without an airtight layer may be used. ) or the like may be used.

Further, as shown in FIGS. 1 and 2, the unsealed end 20a of the packaging material 20 is bonded to the opposing packaging material 20 (the other end 20b in the longitudinal direction) between the pair of welded regions R50. It is preferable to have a bonding area 2 with a large diameter. That is, the inner surface of the unsealed end 20a of the packaging material 20 is preferably bonded to the outer surface of the opposing portion 20b of the packaging material 20 with an adhesive such as a hot melt adhesive.

By doing so, the sealing performance of the unsealed end 20a of the packaging material 20 is improved, and it is possible to suppress the inflow of external moist air from the unsealed end 20a. Therefore, the superabsorbent polymer included in the pad 10 absorbs and retains moisture in humid air, and it is possible to prevent the absorbent performance of the pad 10 from deteriorating. In addition, if the individual package 1 contains a volatile substance that adds a predetermined function (for example, cooling sensation, fragrance, etc.) to the pad 10, the volatilization of the volatile substance (outflow of the volatilized gas) is moderately suppressed. The volatile substance functions during use of the pad 10.

Preferably, at least one of the pair of welded regions R50 has a region that overlaps the adhesive region 2 in the thickness direction.
By doing so, the packaging material 20 is more firmly joined by the welded portion 50 and the adhesive region 2 at the lateral side edges of the individual package 1, and the airtightness of the individual package 1 is improved. Furthermore, it is possible to prevent the pad 10 from being unintentionally opened before use, and the sealing performance of the unsealed end 20a of the packaging material 20 is ensured.

Moreover, the unsealed end 20a of the packaging material 20 has a non-adhesive region N20 on the unsealed end 20a1 side in the vertical direction (lower side in FIGS. 1 and 2) than the adhesive region 2. Since the packaging material 20 in the non-adhesive area N20 is not adhered to the opposing packaging material 20, it is likely to be turned over during distribution or when being carried by a user.
Therefore, the individual packaging body 1 may have a fixing tape 3 that fixes the non-adhesive area N20 to the packaging material 20, like the modified individual packaging body 1 shown in FIG. By doing so, the adhesive tape 3 can suppress the non-adhesive region N20 from turning up, and the unintended opening of the unsealed end 20a of the packaging material 20 due to the turning up can be prevented.

Note that it is sufficient that the adhesive region 2 is provided in a part between the pair of welded regions R50, and by doing so, the sealing performance of the individual package 1 is improved. However, preferably, as shown in FIG. 1, the adhesive region 2 is provided continuously over the entire lateral region between the pair of welded regions R50. Further, as shown in FIG. 7, even when the fastening tape 3 is provided, the adhesive region 2 is preferably provided continuously over the entire horizontal area between the pair of welded regions R50.
By doing so, the airtightness of the individual package is further improved, and a decrease in the absorption performance of the pad 10 due to moist air can be suppressed. Furthermore, the volatilization (outflow) of the volatile substances that provide the pad 10 with predetermined functions (for example, cooling sensation, fragrance, etc.) can be appropriately suppressed, and the functions of the volatile substances can be exhibited while the pad 10 is in use.

Similarly, the bonding region 2 may overlap only one of the pair of welding regions R50, or may overlap only a portion of the welding region R50 in the lateral direction. However, preferably, in both of the pair of welding regions R50, the adhesive region 2 is provided continuously over the entire lateral direction of the welding region R50.
By doing so, the packaging material 20 is more firmly joined in the welding region R50, the sealing performance of the individual package 1 is improved, and unintended opening can be suppressed.

Although not shown, when forming the adhesive area 2 intermittently according to the position of the welding area R50 or the fastening tape 3, consider these positions (for example, by observing with a camera, etc., or by adjusting the timing). It is necessary to form an adhesive area 2 on the packaging material 20 (e.g. by In comparison, as shown in FIG. 1, when forming the adhesive region 2 continuously from one side end to the other side end of the individual package 1 in the lateral direction, the position of the welding region R50 etc. is taken into account. This is not necessary, and the manufacturing process of the individual package 1 can be made easier.

However, without being limited to the above, for example, the individual package 1 may be provided with only the adhesive tape 3 without the adhesive area 2, or the adhesive area 2 and the adhesive tape 3 may be It is not necessary to have both.

Further, it is preferable that the volatile substance provided inside the individual packaging body 1 is coated on at least one of the material constituting the pad 10 and the inner surface of the packaging material 20. In this embodiment, a cooling agent 71 and a fragrance 72 are coated on the material constituting the pad 10 . In addition, hot melt adhesives for adhering the materials constituting the pad 10, forming the adhesive part 18 for preventing slipping, and forming the fixing part 61 for fixing the release sheet 60 to the packaging material 20 are also used for each material. It is coated.

In this way, since the volatile substance is coated on the pad 10 and the packaging material 20, the pad 10 is Since the volatile substances gradually evaporate from the package material 20 and the packaging material 20, the sustainability of the volatile substances increases. Therefore, the effect of suppressing the inflow of humid air due to the volatile substance increasing the internal pressure of the individual packaging body 1 is maintained. As a result, even if the distribution period or storage period of the individual packages 1 is long, the deterioration of the absorbent performance of the pad 10 can be suppressed.

Menthone glycerin acetal is also known as a cooling agent. In this embodiment, a cooling agent 71 (for example, menthol, menthyl lactate, etc.) having higher volatility than menthone glycerin acetal (MGA) is used as a volatile substance contained inside the individual package 1.
By doing so, compared to the case where the individual package 1 contains MGA, the volatilization of volatile substances progresses from a relatively early stage, the internal pressure of the individual package 1 can be increased, and the inflow of moist air is prevented. It can be suppressed. Therefore, it is possible to prevent the absorbent performance from deteriorating before the pad 10 is used.

However, contrary to the above, the volatile substances contained inside the individual package 1 are substances with lower volatility than menthone glycerin acetal (MGA) (for example, vanillyl butyl ether (VBE) used as a warming agent). ) etc.) may be adopted.
By doing so, the persistence of volatile substances is enhanced and the effect of suppressing the inflow of humid air is maintained, compared to when the individual package 1 contains MGA. As a result, even if the distribution period or storage period of the individual packages 1 is long, the deterioration of the absorbent performance of the pad 10 can be suppressed.

Incidentally, the volatile substance contained inside the individual package 1, which has a lower or higher volatility than MGA, may be a cooling agent or a substance with another function (for example, a fragrance or an adhesive). agents, etc.). Further, both a substance with higher volatility and a substance with lower volatility than MGA may be employed.

Further, the number of volatile substances contained inside the individual package 1 may be one type or multiple types. When there are multiple types, they may be substances that exhibit different functions (for example, a cooling sensation agent and a fragrance), or they may be substances that exhibit the same function (for example, two types of cooling agents). Preferably, the interior of the individual package 1 contains two types of volatile substances with different volatilities (the two types may perform different functions or the two types may perform the same function). It is good to have By doing so, the highly volatile substance can increase the internal pressure of the individual package 1 from a relatively early stage to suppress the inflow of moist air, and the low volatility substance can increase the internal pressure of the individual package 1. The effect of suppressing the inflow of humid air can be maintained by increasing the temperature.

Further, as described above, the welding region R50 has a non-welding region R51 that continues from one edge of the welding region R50 in the lateral direction to the other edge of the welding region R50, but the non-welding region R51 is as shown in FIG. As shown in the figure, it is preferable to continue (linearly) along the lateral direction.

In other words, it is preferable that the non-welded region R51, which is aligned in the vertical direction, exists throughout the entire horizontal direction of the welded region R50. By doing so, the gas inside the individual package 1, especially the volatile substances (cooling agent 71, fragrance 72, etc.) can flow out smoothly in the lateral direction without colliding with the welded part 50. Therefore, the gas (volatile substance) inside the individual package 1 can be appropriately released, and the expansion and bursting of the individual package 1 can be suppressed.

However, without being limited to the above, for example, as shown in FIG. 6B, the vertical positions of the welded parts 50 arranged in the horizontal direction of the individual package 1 may be shifted and arranged in a staggered manner. In this case as well, if the gas (volatile substances 71, 72) collides with the welded part 50 while moving laterally through the non-welded area R51, the non-welded parts on both sides of the welded part 50 in the vertical direction It can flow out to the outside while passing through region R51. In other words, the non-welded region R51 may be continuous from one edge of the welded region R50 in the lateral direction to the other edge of the welded region R50 while meandering in the vertical direction. In that case as well, expansion and bursting of the individual package 1 can be suppressed.

Further, as shown in FIG. 6A, the length L2 in the vertical direction of the non-welded region R51 that is continuous along the horizontal direction (that is, the interval L2 in which the welded parts 50 are arranged in the vertical direction) is the same as that in the vertical direction of the non-welded region R51. It is preferable that the length is longer than 1/2 of the length L1 in the vertical direction of the welded part 50 adjacent to one side (upper or lower side) of (L2>L1/2). More preferably, the length L2 of the non-welded region R51 in the vertical direction is equal to or longer than the length L1 of the welded portion 50 in the vertical direction (L2≧L1).
By doing so, it is possible to prevent the vertical length L2 of the non-welding region R51 (gas path) from becoming too small, making it difficult for the gas (volatile substances 71, 72) to flow out. That is, the gas can be appropriately allowed to flow out of the individual package 1, and expansion and bursting of the individual package 1 can be suppressed. However, it is not limited to the above. For example, the length L2 in the vertical direction of the non-welded region R51 may be longer than 1/2 of the minimum length L1 in the vertical direction among the plurality of welded parts 50 that the welded region R50 has.

On the other hand, the length L2 in the vertical direction of the non-welded region R51 is not more than 3 times the length L1 in the vertical direction of the welded part 50 adjacent to the non-welded region R51 on one side (upper or lower side) in the vertical direction. It is preferable that it is, and more preferably that it is twice the length L1 or less.
By doing so, the length L2 of the non-welded region R51 in the vertical direction is larger than three times the length L1 of the welded part 50 in the vertical direction. The length L2 of the pad 10 does not become too large, it is possible to prevent humid air from entering from the outside easily, and the absorption performance of the pad 10 can be ensured. In addition, it is possible to moderately suppress the volatilization (outflow of volatilized gas) of volatile substances (for example, the cooling agent 71 and fragrance 72, etc.) that add a predetermined function to the pad 10, so that the volatile substances can be prevented while the pad 10 is in use. It can be made to work. However, it is not limited to the above. For example, the length L2 in the vertical direction of the non-welded region R51 may be three times or less the maximum length L1 in the vertical direction among the plurality of welded parts 50 that the welded region R50 has.

Further, in at least one of the pair of welded regions R50, the total area of the welded portions 50 provided in the welded region R50 is preferably smaller than 1/2 of the area of the welded region R50. In other words, half or more of the welded region R50 is preferably a non-welded region (a region other than the welded portion 50). By doing so, compared to the case where the non-welded area is less than half of the welded area R50, gas (volatile substances 71, 72) can be appropriately discharged from the non-welded area to the outside, and the individual package 1 The expansion and rupture of can be suppressed.

Specifically, in this embodiment, the length L1 in the vertical direction of the welded portion 50 is approximately 0.3 mm to 0.7 mm, and the length L2 in the vertical direction of the non-welded region R51 is approximately 0.5 mm to 1.4 mm. shall be. However, the sizes of the welded portion 50 and the non-welded region R51 are not particularly limited.
Further, the shape, number, and arrangement position of the welded portions 50 illustrated in FIGS. 6A and 6B are merely examples, and the present invention is not limited thereto. For example, the shape of the welded portion 50 is not limited to a square, and various shapes such as a circle, an ellipse, and a rectangle can be adopted. Further, the number of rows of welded parts 50 in which a plurality of welded parts 50 are lined up in the vertical direction is not limited to five, but may be one or more.

Further, in FIG. 6A, welded portions 50 having the same shape and size are lined up at predetermined intervals within the welded region R50, but the present invention is not limited thereto. For example, the welded region R50 may have welded portions 50 of a plurality of shapes and sizes, or the arrangement interval of the welded portions 50 (that is, the length in the vertical direction of the non-welded region R51) may not be constant. Good too.
Therefore, it is only necessary that at least one non-welded region R51 is provided in the welded region R50, which continues along the lateral direction from one end edge of the welded region R50 to the other end in the lateral direction. In this case, the above effects can be obtained.
In addition, in the welded region R50, there is a non-welded region R51 whose length L2 in the vertical direction is longer than 1/2 of the length L1 in the vertical direction of the adjacent welded portion 50, and a It is sufficient that at least one non-welded region R51 having a length L2 in the vertical direction that is 2 to 3 times or less the length L1 in the direction is provided, and in that case, the above-mentioned effects can be obtained.

Further, in the pad 10, it is preferable that an oil agent is placed closer to the skin than the absorbent cores (the first absorbent core 31 and the second absorbent core 41). For example, in the modified pad 10 shown in FIG. 8, a pattern that is visible through the top sheet 11 is printed on the intermediate sheet 12, and the intermediate sheet 12 is provided with printing ink PI as a lubricant. In addition, an oil agent for controlling liquid permeability may be applied to the top sheet 11 and intermediate sheet 12 on the skin side of the absorbent cores 31 and 41 to form an oil layer. Examples of such oils include oils such as mono- and di-triglycerides, esters of fatty acids, hydrocarbons such as vaseline, and higher alcohols such as stearyl alcohol.

Since the oil agent is provided closer to the skin than the absorbent cores 31 and 41, the moist air that has flowed into the inside of the individual package 1 becomes difficult to permeate through the oil layer, and reaches the absorbent cores 31 and 41. becomes difficult to reach. Therefore, the water absorbent resin contained in the absorbent cores 31 and 41 can be prevented from absorbing moisture from humid air, and the absorbent performance of the pad 10 can be ensured. Furthermore, the oil layer makes it difficult for volatile substances such as the cooling sensation agent 71 to come into direct contact with the wearer, thereby reducing irritation to the wearer.

Further, it is preferable that the outer surface of the packaging material 20 has lower smoothness than the inner surface of the packaging material 20. In this case, the outer surface of the packaging material 20 has large irregularities and a high coefficient of friction. Therefore, the movement of the individual packages 1 can be reduced when the individual packages 1 are distributed or carried by a user. As a result, it is possible to prevent the unsealed end 20a of the packaging material 20 from being turned over or unintentionally opened, and to suppress the inflow of moist air into the interior of the individual packaging body 1, thereby ensuring the absorption performance of the pad 10.

However, contrary to the above, the inner surface of the packaging material 20 may have lower smoothness (or may have a higher coefficient of friction) than the outer surface of the packaging material 20. In this case, the unevenness of the inner surface of the packaging material 20 becomes large, so that the recesses are likely to be filled with volatile substances (volatile gas). By filling the space near the outside of the individual package 1 with volatile substances in this way, the inflow of humidity into the interior of the individual package 1 can be further suppressed, and the absorption performance of the pad 10 can be ensured.

The degree of smoothness of the packaging material 20 can be determined based on the coefficient of static friction on both sides of the packaging material 20. The static friction coefficient can be measured according to JIS P8147 (b) horizontal method. In measuring the coefficient of static friction, a friction cotton cloth "Kanakin No. 3" specified by JIS L0803 is used as a test piece for the horizontal plate, and a low-friction member is used as a test piece for the weight.

Further, it is preferable that the pad 10 has a recessed portion in which at least a portion of the pad 10 is recessed in the thickness direction. As shown in FIG. 3, the pad 10 of this embodiment has a compressed portion 19 in which the pad 10 is compressed in the thickness direction. The compressed portion 19 only needs to compress at least a part of the absorbent cores 31 and 41, and the compressed portion 19 of this embodiment is compressed from the topsheet 11 to the second absorbent core 40 from the skin side. By doing so, it is possible to suppress twisting of the absorbent cores 31 and 41, and increase the diffusibility of excretory fluid.
Further, the recessed portion is not limited to the compressed portion 19, but may be a low basis weight portion or a slit where the basis weight (g/m ² ) of the material forming the absorbent cores 31, 41 is lower than the surrounding area. In the pad 10 of this embodiment, as shown in FIG. 5, the first absorbent core 31 has a slit 34.

Since the pad 10 has a recessed part (the compressed part 19 and the slit 34), the recessed part is easily filled with volatile substances, and the surroundings of the absorbent cores 31 and 41 are filled with volatile substances, thereby increasing the absorbency. It becomes difficult for moist air to flow around the cores 31 and 41. As a result, the absorbent performance of the absorbent pad 10 is ensured.

Further, as shown in FIG. 3, the recessed portions of the pad 10, like the compressed portions 191 of this embodiment, extend in the longitudinal direction and are provided on both sides of the pad 10 in the lateral direction. is preferred.
By doing so, the compressed parts 191 on both sides of the pad 10 in the lateral direction are likely to be filled with volatile substances, making it difficult for moist air to flow into the lateral center of the pad 10. As a result, the absorption performance is ensured in the lateral center of the pad 10 where the most excreted fluid is excreted.
Further, the pad 10 is provided with a pair of compressed portions 192 extending in the lateral direction at both ends in the longitudinal direction. Therefore, the compressed portion 192 is likely to be filled with volatile substances, making it difficult for moist air to flow into the vertical center of the pad 10. As a result, the absorption performance is ensured even in the longitudinal center portion of the pad 10 where the most excreted fluid is excreted.
However, the shape of the recessed portions such as the compressed portion 19 is not limited to the above.

In addition, the pad 10 is made of cellulose fibers (for example, pulp It is preferable to have a material containing fibers, etc.). For example, in the pad 10 of this embodiment, the second skin side core wrap 42 and the second non-skin side core wrap 43 are made of tissue containing cellulose fibers.
Cellulose fibers have a lower water absorption and water retention capacity than water-absorbing resins, but have a faster liquid absorption rate. Therefore, by providing the cellulose fibers outside the absorbent cores 31 and 41 in the thickness direction, the cellulose fibers can easily absorb moisture from humid air. Therefore, it becomes difficult for moist air to flow into the absorbent cores 31 and 41, and the absorbent performance of the pad 10 is ensured.

Further, as shown in FIG. 3, in at least a part of the outer peripheral edge of the pad 10, skin-side sheets (here, the top sheet 11, the first side sheet 13, etc.) located closer to the skin than the absorbent cores 31, 41, etc. ) and a non-skin side sheet (here, the back sheet 16, etc.) located on the non-skin side of the absorbent cores 31, 41 are preferably welded to form the round seal portion 1R.
In the round seal portion 1R, the pad 10 is thinner than the surrounding area, and a space is likely to be formed between the pad 10 and the packaging material 20. That space, that is, the space around the pad 10 near the outside of the individual package 1, is likely to be filled with volatile substances, making it difficult for moist air to flow into the inside of the pad 10. As a result, the absorbent performance of the pad 10 is ensured.

Further, as shown in FIG. 1, the lateral length X1 from the inner end of the welding region R50 on one side in the lateral direction to the end of the pad 10 on the one side in the lateral direction, and the welding area on the other side in the lateral direction. The total value of the horizontal length X2 from the inner end of the region R50 to the end of the pad 10 on the other side in the horizontal direction is "X1+X2". This total value X1+X2 is preferably shorter than the maximum length X3 of the pad 10 in the lateral direction (X1+X2<X3).
By doing so, the space between the pad 10 and the welding region R50 does not become too large, and the volatile substance easily fills the space. As a result, it becomes difficult for moist air to flow into the interior of the individual package 20, and the absorption performance of the pad 10 is ensured.

In addition, in the individual packaging body 1 of this embodiment, as shown in FIG. It is folded so that 60 is on the outside.
Therefore, the release sheet 60 can suppress the flow of humid air into the inside of the pad 10, making it difficult for the water-absorbing resin inside the pad 10 to absorb moisture from the humid air, and ensuring the absorption performance of the pad 10. However, the present invention is not limited to the above, and the pad 10 may be directly attached to the packaging material 20 by subjecting the inner surface of the packaging material 20 to a peeling process.

Moreover, it is preferable that a part of the volatile substance contained inside the individual packaging body 1 is encapsulated in microcapsules. A microcapsule is a capsule having a diameter of 1 to 1,000 μm and a core material having a space for encapsulating a volatile substance (for example, a cooling agent 71 or a perfume 72). Microcapsules may disintegrate and release volatile substances when they come into contact with water (liquids such as sweat or urine), or they may release volatile substances due to physical pressure (impact, friction). It may be something. Note that the external shape of the capsule is not particularly limited, and examples include external shapes such as a spherical shape and an amorphous shape. Further, the capsule may be a mononuclear type having one space for holding a core material, or a multinuclear type having a plurality of spaces for holding a core material.

Since a part of the volatile substance is encapsulated in the microcapsules, the volatile substances not encapsulated in the microcapsules can volatilize from a relatively early stage, and the internal pressure of the individual packaging body 1 can be increased. , can suppress the inflow of humid air. On the other hand, the volatile substances contained in the microcapsules volatilize at a relatively slow stage and can increase the internal pressure of the individual package 1, so that the effect of suppressing the inflow of humid air continues. However, the present invention is not limited to the above, and the volatile substance does not need to be encapsulated in microcapsules.

===About the package 90 of the individual package 1===
9A and 9B are explanatory diagrams of a method for measuring changes in the thickness of the individual package 1. FIG. 10A to 10C are explanatory diagrams of a method for measuring changes in the thickness of the package 90. As shown in FIG. 10A, the individual packages 1 may be distributed as a package 90 in which one or more individual packages 1 are housed in a bag 91. In the package 90, inside the bag body 91, a plurality of individual packages 1 are housed in a stacked manner in the thickness direction. In the package 90, the direction in which the plurality of individual packages 1 are lined up is called a stacking direction (predetermined direction). Note that the stacking method of the individual packages 1 shown in FIG. 10A is an example, and the stacking method is not limited thereto. For example, the stack of individual packages 1 may be stacked in one row instead of two rows.

Since the interior of the individual packaging body 1 contains volatile substances, the volatile substances flowing out from the individual packaging body 1 fill the inside of the bag body 91 of the package 90. Therefore, the internal pressure of the bag body 91 increases, making it difficult for moist air to flow into the inside of the bag body 91. As a result, moist air is also difficult to flow into the inside of the individual package 1, ensuring the absorption performance of the pad 10. be done. However, if the inside of the bag 91 is filled with too much volatile substance, the bag 91 will expand and burst, so it is preferable that the bag 91 has an opening for releasing the volatile substance. For example, it is preferable to have perforations 92 (intermittent openings) for the user to open the bag 91. By doing so, it is not only easier for the user to open the bag 91, but also the volatile substance can be released from the opening of the perforation 92 to the outside of the bag 91, and expansion of the bag 91 can be suppressed. Note that the opening for releasing volatile substances to the outside is not limited to the perforation 92, but may be, for example, a notch that triggers the opening of the bag 91, or a notch that triggers the opening of the bag 91. It may be an opening provided separately from the portion where the opening is provided.

Furthermore, when comparing the rate of change in thickness between the individual package 1 and the package 90 in their natural state and when pressurized, it is found that the rate of change in the thickness of the individual package 1 is greater than that of the package 90. preferable.
Specifically, as shown in FIG. 9A, the length in the thickness direction of the individual package 1 in its natural state (not pressurized) is t1, and as shown in FIG. 9B, the length of the individual package 1 in the thickness direction is t1. Let t2 be the length of the individual package 1 in the thickness direction when it is pressed with a force of 1000 N/m ² in the stacking direction. In this case, the value "(t1-t2)/t1" obtained by dividing the change in thickness by the thickness in the natural state (initial state) is taken as the rate of change in the thickness of the individual package 1.
Similarly, as shown in FIG. 10B, the length of the package 90 in the stacking direction in a natural state (non-pressurized state) is T1, and as shown in FIG. 10C, the length of the package 90 in the stacking direction is 1000 N/m ² Let T2 be the length of the package 90 in the stacking direction when it is pressurized with a force of . In this case, the rate of change in the thickness of the package 90 is determined by dividing the change in thickness by the thickness in the natural state (initial state), ie, "(T1-T2)/T1".

The rate of change in the thickness of the individual packaging body 1 is greater than the rate of change in the thickness of the package 90, that is, "(T1-T2)/T1<(t1-t2)/t1" means that It can be said that the gas inside the package 1 leaks out more easily than the package 90. The individual package 1 that directly contains volatile substances is more likely to expand and burst due to the volatile substances than the package 90. Therefore, the individual package 1 allows volatile substances to escape to the outside more easily than the package 90, so that expansion of the individual package 1 can be suppressed more reliably. Conversely, in the package 90, there is less risk of expansion of the package 90 without unnecessarily enlarging the opening of the perforation 92. Therefore, the opening of the perforation 92 can be made as small as possible, and as a result, it becomes difficult for moist air to flow in from the outside, and the absorption performance of the pad 10 is further ensured.

The method for measuring the thickness of the individual package 1 and the package 90 is as follows.
First, an acrylic plate 80 and a weight 81 that are larger than a plane perpendicular to the thickness direction of the individual package 1 and a plane perpendicular to the stacking direction of the package 90 are prepared. The total weight of the acrylic plate 80 and the weight 81 is adjusted so that a force of 1000 N/m ² is applied to the individual package 1 and the package 90.
Next, as shown in FIG. 9A, the individual package 1 is placed on a horizontal test stand so that the plane of the individual package 1 is aligned. The thickness (maximum thickness) t1 of the individual packaged body 1 in its natural state is measured using a ruler or the like. Thereafter, as shown in FIG. 9B, an acrylic plate 80 is placed on the top surface of the individual package 1, and a weight 81 is placed on the acrylic plate 80. Then, 10 seconds after the force is applied to the entire flat surface of the individual package 1, the thickness (maximum thickness) t2 of the individual package 1 is measured. Based on the measured thicknesses t1 and t2, the rate of change in the thickness of the individual package 1 is calculated.
Similarly, as shown in FIG. 10B, the package 90 is placed on a horizontal test stand so that the stacking direction of the package 90 is vertical, and the thickness (maximum thickness) T1 of the package 90 in the natural state is determined. Measure. Note that the thickness of the package 90 is the thickness of the portion where the individual packaging body 1 is placed. Thereafter, as shown in FIG. 10C, 10 seconds after placing the acrylic plate 80 and the weight 81 on the top surface of the package 90, the thickness (maximum thickness) T2 of the package 90 is measured. The rate of change in the thickness of the package 90 is calculated based on the measured thicknesses T1 and T2.

Although the embodiments of the present invention have been described above, the above-described embodiments are intended to facilitate understanding of the present invention, and are not intended to be interpreted as limiting the present invention. Further, the present invention may be modified and improved without departing from the spirit thereof, and it goes without saying that the present invention includes equivalents thereof.

1 individual packaging (absorbent article packaging),
2 adhesive area, 3 adhesive tape,
10 Pad (absorbent article)
11 surface sheet, 12 intermediate sheet, 13 first side sheet,
14 thread rubber, 15 second side sheet, 16 back sheet,
18 Adhesive part for preventing slippage,
20 Packaging material,
30 first absorbent body, 31 first absorbent core,
32 first skin side core wrap, 33 first non-skin side core wrap,
40 second absorbent core, 41 second absorbent core,
42 second skin side core wrap, 43 second non-skin side core wrap,
50 welded part,
R50 welding area, R51 non-welding area,
60 release sheet, 61 fixing part,
71 Cooling agents (volatile substances), 72 Flavors (volatile substances),
80 Acrylic board, 81 Weight,
90 Package (of absorbent article packaging),
91 Bag PI Printing ink (oil)

Claims (14)

An absorbent article containing a water-absorbing resin and having a value obtained by dividing water retention amount by water absorption amount of 0.55 or more;
comprising a packaging material;
An absorbent article package having a transverse direction, a longitudinal direction, and a thickness direction,
The moisture permeability of the packaging material is 2000 g/m ² · 24 h or less,
The packaging material is folded with the absorbent article inside so that the unsealed end of the packaging material along the lateral direction is located on the packaging material,
The absorbent article package contains a volatile substance,
A pair of welded areas are provided on the pair of side edges in the lateral direction,
At least one of the pair of welded areas,
a plurality of welds that intermittently join the packaging materials;
having a non-welded region that is continuous from one edge of the welded region in the lateral direction to the other edge;
An absorbent article packaging body characterized by: The absorbent article package according to claim 1,
An absorbent article package, wherein between the pair of welded regions, the unsealed end of the packaging material has an adhesive region bonded to the opposing packaging material. The absorbent article package according to claim 2,
The unsealed end of the packaging material has a non-adhesive region closer to the unsealed end in the longitudinal direction than the adhesive region,
The absorbent article package is characterized in that the absorbent article package has a fixing tape that fixes the non-adhesive area to the packaging material. The absorbent article package according to claim 2 or 3,
An absorbent article package, wherein at least one of the pair of welded regions has a region that overlaps the adhesive region in the thickness direction. The absorbent article package according to any one of claims 1 to 3,
An absorbent article packaging body, wherein the volatile substance is coated on at least one of a material constituting the absorbent article and an inner surface of the packaging material. The absorbent article package according to any one of claims 1 to 3,
An absorbent article package, wherein at least one of the pair of welded regions has the non-welded region that is continuous along the lateral direction. The absorbent article package according to claim 6,
The length of the non-welded region in the longitudinal direction is longer than 1/2 of the length of the welded portion adjacent to the non-welded region on one side in the longitudinal direction. Absorbent article packaging. The absorbent article package according to any one of claims 1 to 3,
The absorbent article package is characterized in that the volatile substance has higher volatility than menthone glycerin acetal. The absorbent article package according to any one of claims 1 to 3,
The absorbent article package is characterized in that the volatile substance has lower volatility than menthone glycerin acetal. The absorbent article package according to any one of claims 1 to 3,
An absorbent article packaging body, wherein the packaging material has an oxygen permeability in the thickness direction of 100 cc/m ² /24 h/atm or less at 23°C. The absorbent article package according to any one of claims 1 to 3,
The absorbent article has an absorbent core,
An absorbent article package characterized in that, in the absorbent article, an oil agent is disposed closer to the skin than the absorbent core. The absorbent article package according to any one of claims 1 to 3,
An absorbent article packaging body, wherein the outer surface of the packaging material has lower smoothness than the inner surface of the packaging material. The absorbent article package according to any one of claims 1 to 3,
An absorbent article packaging body, wherein the inner surface of the packaging material has lower smoothness than the outer surface of the packaging material. A package for an absorbent article packaging body, in which the absorbent article packaging body according to any one of claims 1 to 3 is accommodated in a bag body,
having a predetermined direction corresponding to the thickness direction of the absorbent article package inside the bag,
The length of the package in the natural state in the predetermined direction is T1,
The length of the package in the predetermined direction when the package is pressed in the predetermined direction with a force of 1000 N/m ² is T2,
The length of the absorbent article package in the natural state in the thickness direction is t1,
When the length of the absorbent article package in the thickness direction when the absorbent article package is pressed in the thickness direction with a force of 1000 N/m ² is t2,
(T1-T2)/T1<(t1-t2)/t1,
A package for an absorbent article packaging body characterized by:

Images