CN111700735A

CN111700735A - Absorbent article

Info

Publication number: CN111700735A
Application number: CN202010591276.7A
Authority: CN
Inventors: 杨立业; 徐源鸿; 李田雨
Original assignee: Pigeon Industries Changzhou Co Ltd
Current assignee: Pigeon Industries Changzhou Co Ltd
Priority date: 2020-06-24
Filing date: 2020-06-24
Publication date: 2020-09-25

Abstract

The invention discloses an absorbent article, which comprises a surface layer, an absorber, a guard and a back layer. The surface layer, the absorber and the protective enclosure are arranged in an up-down overlapping mode, wherein the surface layer is in direct contact with the skin. The facing layer wraps around the absorption body from the side close to the wearer's skin and forms an opening at the side remote from the wearer's skin, and the area of the facing layer close to the opening is attached to the fixed end of the apron or to the backing layer. The absorbent article has a high absorption rate and a large liquid absorption amount.

Description

Absorbent article

Technical Field

The present invention relates to the field of articles of daily use, and in particular to an absorbent article for use as a paper diaper for infants or adults and the like.

Background

Fig. 1 shows an expanded view of an absorbent article such as a pant-type diaper. After A1 and A2 and A3 and A4 in the figure 1 are butted, the pants-type absorbent product with a three-dimensional structure is formed. Fig. 2 shows a schematic transverse cross-sectional view of the pant diaper in the direction a-a of fig. 1. In order to distinguish the relationship between the layers of the absorbent article, the glue between the layers of fig. 2 is hidden and the spacing between the layers is shown in an appropriately enlarged manner.

As shown in fig. 1 and 2, an absorbent article such as a diaper is provided with a water-permeable top sheet 1, an absorbent body 2, and a water-repellent back sheet 3 in this order. Wherein the water permeable facing layer 1 is in contact with the skin of the user and directly absorbs foreign matter such as urine. The foreign matter passes through the water-permeable top sheet 1, enters the absorbent body 2, flows through the absorbent body 2 from the top to the bottom, and remains in the absorbent body 2.

In the existing absorbent products, the materials of the layers are fixed with each other by hot melting or gluing to form the product. The adhesive between the absorption body 1 and the water-permeable surface layer 2 does not have good water permeability, which slows down the rate of foreign bodies entering the absorption body. Meanwhile, the absorbent body 2 is in contact with the water-permeable cover 1 only at the surface on the side close to the skin of the user, and the contact area between the two is limited, which also affects the rate at which the absorbent body 2 absorbs foreign matter. Therefore, the conventional absorbent article cannot ensure rapid absorption of foreign matter, so that the skin of the user cannot be rapidly put into a dry state.

The absorbent article shown in fig. 1, 2 also has a problem of insufficient absorption capacity. Specifically, the absorbent body 2 is made of a material having strong water absorbing and retaining capabilities, and liquid flowing into a certain region in the absorbent body 2 is less likely to continue flowing in the absorbent body 2. Since the portions at the respective marginal positions of the absorbent body 2 are less likely to directly contact and absorb liquid, the liquid-absorbing function of the absorbent body 2 in these portions cannot be clearly exhibited.

With further reference to fig. 2, in the known absorbent article, the top portions 4A of the barriers 4 at the top positions on both sides of the absorbent article are folded back toward the longitudinal center of the absorbent article. During wear, the top portion 4A of the containment barrier 4 will directly contact the wearer's leg. As the absorbent article is further lifted up to the waist, the leg circumference of the user increases and exerts an increasing pressure on the top portion 4A, and the top portion 4A is continuously drawn towards the central position AA of the diaper by friction. The elastic body of the cuff top portion 4A is not free to stand upright under the pressing action of the face layer 1 and the back layer 3, and exerts its elastic lockstitching action, which results in the leakage-proof cuff losing its "leakage-proof" effect.

Therefore, further improvement in the performance and the like of conventional absorbent articles such as disposable diapers is desired.

Disclosure of Invention

One of the objects of the present invention is to propose an absorbent article which is capable of solving at least the technical problem of how to achieve rapid absorption of foreign matter such as urine.

The present invention is achieved by an absorbent article of the following form. The absorbent article includes a topsheet, a backsheet, an absorbent body, and a containment flap. Wherein the facing layer is in direct contact with the wearer's skin and is configured to enable liquid to pass therethrough. The back layer and the surface layer are oppositely arranged and positioned on one side far away from the skin of a wearer, wherein the back layer is made of breathable and waterproof materials. The absorption body is arranged between the surface layer and the back layer and is used for absorbing and locking the liquid. The containment flaps include a fixed end fixed between the face layer and the back layer and a free end opposite the fixed end, and are configured to prevent leakage of the liquid from the lateral sides of the absorbent article.

Wherein the facing layer wraps around the absorbent body from the side close to the wearer's skin and forms an opening at the side remote from the wearer's skin, and the area of the facing layer close to the opening is attached to the fixed end of the cuff or to the backing layer.

Since the top sheet is joined to the absorbent body in the form of a "wrap around" the absorbent body, the absorbent body is held firmly inside the absorbent article even with a small amount of glue therebetween, which results in a large contact area of the absorbent body with the top sheet on the side facing the skin of the wearer.

In addition to this, only a partial area of the face layer on the side facing away from the wearer is attached to the containment barrier or the backing layer. Since the surface layer is not bonded to the backsheet or the leakage protection cuff in at least a partial region of the side, liquid such as urine can be smoothly guided from the surface layer to the surface of the absorbent body on the side facing away from the wearer's skin. Liquid can be absorbed on the respective side surfaces of the absorption body during the flow, i.e. both during the passage of liquid through the side surfaces of the absorption body which are close to the skin of the wearer, the side surfaces which are remote from the skin of the wearer and the lateral side surfaces, so that liquid can be absorbed into the absorption body at a higher speed and the wearer can more quickly be brought into a dry state. Furthermore, absorbent articles of this type are more advantageous in that liquid is directed uniformly to the respective edge positions of the absorption body, thereby increasing the absorption capacity of the absorption body.

According to a preferred embodiment of the invention, the area where the facing layer and the containment or backing layer are attached to each other extends from the edge side towards the opening. With the area for attachment of the facing layer being arranged as above, liquid is more readily led to the extreme end of the facing layer, as the area which hardens by the arrangement of the adhesive or by heat sealing, a larger area of the surface of the side of the absorption body facing away from the skin of the wearer can be in direct contact with the facing layer and absorb liquid directly.

According to a preferred embodiment of the invention, the fixed end of the containment flap is interposed between the facing layer and the back layer and is flush with the corresponding end of the facing layer in the transverse direction of the absorbent article.

In this case, the facing layer is attached to the containment barrier in the area facing away from the wearer's skin. In this case, the absorbent article on both the left and right sides of the opening has a uniform thickness, as compared with a case where the face sheet is directly attached to the water-repellent back sheet. Because the left and right sides of the opening are all the regions for directly fitting with the wearer, the arrangement with uniform thickness can avoid bringing uneven wearing feeling to the wearer.

According to a preferred embodiment of the invention, a longitudinal centre plane of the opening substantially coincides with a longitudinal centre plane of the absorbent article.

The extent of the region in the transverse direction where the facing layer and the containment or backing layer are attached to each other is a distance L₁Comprises the following steps: l is less than or equal to 5%₁L ≦ 20%. L, where L is an extension distance of the absorbent body in the transverse direction. The extension distance L is such that a firm joint between the layers is ensured₁A maximum extension of the surface layer on the side of the absorption body facing away from the skin of the wearer can be ensured.

According to a preferred embodiment of the invention, the barrier extends from the fixed end around both lateral sides of the facing layer to the side of the top surface of the facing layer which is close to the skin of the wearer and a free end extends at said top surface, wherein said free end is configured as a fold having an opening towards the lateral side of the absorbent article. The bent portion includes a first portion extending inward of the top surface and a second portion extending in an opposite direction from an end of the first portion. The second portion is provided with at least one longitudinally extending elastic body at a position towards the edge of the absorbent article.

When the wearer wears the absorbent article, the inner side of the free end (the folded portion) is pressed in advance, and the second portion of the free end is thereby raised naturally in the direction perpendicular to the absorbent body. The containment flaps now more easily fulfil a leakproof function, whereby the absorbent product is able to fulfil a further object of the invention.

According to a preferred embodiment of the present invention, the extension distance D of the bent portion on the top surface along the transverse direction is 20mm ≦ D ≦ 30 mm. The second portion of the bending region can form a leakage prevention region of a suitable height in a direction perpendicular to the absorber. The leakage-proof area can not cause the liquid to be directly sprayed to the leakage-proof surrounding edge to overflow due to overhigh height; at the same time, the absorption rate of the absorption body is not reduced because the extension length is too long and the side close to the skin of a wearer is covered with more surface layers.

According to a preferred embodiment of the invention, the top layer contains a pH regulator selected from the group consisting of 0.05 to 1 wt% of tea polyphenols, 0.05 to 0.1 wt% of caprylhydroxamic acid or a mixture of both. More preferably, the pH adjusting agent is present at a concentration of 0.05 wt% caprylhydroxamic acid, or a mixture of 0.3 wt% tea polyphenol and 0.05 wt% caprylhydroxamic acid.

Wherein the dosage of the pH regulator is preferablyIs 7g/m²-10g/m². The pH value of the pH value regulator is 4.5-5.5.

According to the surface layer of the form, the activity of urease can be effectively inhibited, the increase of the PH value is controlled, and the surface layer is ensured not to cause irritation to the skin of a wearer to the maximum extent even if urine and the like are left.

According to a preferred embodiment of the present invention, the absorbent article includes an elastic waist circumference for elastically attaching the absorbent article to a user, the elastic waist circumference includes a front waist region corresponding to an abdomen of the user and a rear waist region corresponding to a waist of the user, and a stretch magnification of the front waist region is lower than a stretch magnification of the rear waist region.

According to the conventional absorbent article, the elastic waist of some products is made of a single elastic body. The elastic waistline of part of the product has the characteristic of different girth lengths at different positions of the waistline of a human body in the height direction, and elastic bodies with different elasticity or lengths are arranged at the positions corresponding to different waistline heights. However, the above design also only takes into account the anatomical features. In the preferred embodiment described above, the inventors have found that, during breathing by a wearer such as an infant, the wearer may cause less pressure to be exerted on the absorbent article in the area corresponding to the abdomen by breathing. In the case where the front waistline region is set to have a small stretch ratio, the absorbent article worn on the user's body can produce a relatively uniform pressure feeling on the abdomen and back waistline of the user, thereby providing a more comfortable user feeling during use.

According to a preferred embodiment of the invention, the surface layer is spaced apart from the backing layer or the apron in a partial area of the side facing away from the skin of the wearer to form a free zone, and the free zone has an extension D1 in the transverse direction of: d1 is more than or equal to 5mm and less than or equal to 15 mm.

According to a preferred embodiment of the present invention, the main body includes an absorber covering sheet between the top sheet and the absorber, the absorber covering sheet being a hydrophilic SMS nonwoven fabric or a water absorbent paper.

According to a preferred embodiment of the invention, the width D2 of the opening is: d2 is not less than 15mm and not more than 25 mm.

According to a preferred embodiment of the present invention, the grammage FAW of the hydrophilic SMS nonwoven fabric is: FAW is more than or equal to 12gsm and less than or equal to 18 gsm.

According to a preferred embodiment of the present invention, the absorbent body includes fluff pulp, water-absorbent polymer resin particles, or ES fibers.

According to a preferred embodiment of the present invention, the surface layer is made of low water retention fibers with a water retention capacity of 20-50mg/15 ml.

According to a preferred embodiment of the invention, the absorbent article is a pant-type diaper which can be worn directly.

On the basis of the common general knowledge in the field, the preferred embodiments can be combined randomly to obtain the preferred examples of the invention.

Other systems, features and advantages of the invention will be or will become apparent to one with skill in the art upon examination of the following figures and detailed description. It is intended that all such additional systems, features and advantages be included within this description and this summary, be within the scope of the invention, and be protected by the accompanying claims.

Drawings

Fig. 1 is a schematic perspective view of a conventional pant type diaper after being unfolded.

Fig. 2 is a schematic cross-sectional view along the transverse centerline a-a of fig. 1.

Fig. 3 is a schematic perspective view of a pant diaper according to the invention after deployment.

Fig. 4 is a schematic cross-sectional view along the longitudinal centerline B-B of fig. 3.

Fig. 5 is a schematic cross-sectional view according to the line C-C along the transverse centre line of fig. 3.

Fig. 6 is a schematic cross-sectional view of the diaper of the alternative embodiment of fig. 5.

Fig. 7(a) is a schematic view of a folded portion of the diaper of fig. 5 and 6 in an unused state.

Fig. 7(b) is a schematic view of the folded portion of the diaper just before contacting the leg of the wearer.

Fig. 7(c) -7(e) are schematic views of the folded part in different states after the diaper is worn.

FIG. 8 is a graph showing a comparison of data on the rewet amount of diapers according to different embodiments.

Fig. 9 is a data comparison graph of the absorbent body utilization rate of the diaper according to the different embodiment.

Fig. 10 is a graph showing a change in PH state of the diaper according to the different embodiment.

Fig. 11 is a schematic view of a diaper having dimensions indicated.

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, is intended to be illustrative, and not restrictive, and it is intended that all such modifications and equivalents be included within the scope of the present invention.

In the present invention, the term "proximal" refers to the side closer to the wearer's skin, and "distal" refers to the side farther from the wearer's skin; the top side of the pant diaper in fig. 4-7 corresponds to the wearer's skin and the bottom side corresponds to the exposed side of the pant diaper. In the following description, directional terms such as "upper", "lower", "left", "right", etc., are used for illustration only, and directional terms are used for example, and not for limitation, and components of the present invention may be positioned in a variety of different orientations. "longitudinal" means the longitudinal direction of the diaper, and "transverse" means the width direction of the diaper, and the "longitudinal" is in a perpendicular relationship.

For convenience of explanation, the structure, material, and the like of a pants-type diaper as one type of absorbent article will be described below in an illustrative form, and it is understood that other types of absorbent articles such as a diaper, an incontinence protector, a sanitary napkin, and a diaper may be used with the same material and structure as the pants-type diaper, except that the structure for ensuring that the absorbent article can be worn is slightly different from the structure of the pants-type diaper.

As shown in fig. 3-6, wherein fig. 3 is a schematic view of an unfolded pant-type diaper according to a preferred embodiment of the present invention; FIG. 4 is a longitudinal cross-sectional view taken along longitudinal centerline B-B of FIG. 3; fig. 5, 6 are transverse cross-sectional views along the transverse centerline C-C of fig. 1, wherein fig. 5, 6 show transverse cross-sectional views of different embodiments.

As shown in fig. 3-6, the diaper 100 comprises a topsheet 110, a backsheet 130, an absorbent body 120, and a containment 140. The topsheet 110, the absorber 120, and the backsheet 130 are disposed in this order from the proximal side to the distal side of the diaper 100. Facing layer 110 is intended to be in direct contact with the wearer's skin and may be made of a material that is readily permeable to liquids such as urine, such as a hot air non-woven fabric. The fibers in the through-air nonwoven are preferably arranged to extend in the longitudinal direction BB.

The absorber 120 includes a material such as fluff pulp, high-molecular water-absorbent resin particles, or ES fibers, and the like, which is used to absorb and lock liquid. In general, fluff pulp, water absorbent polymer particles, or ES fibers are used in the form of particles such as granules or particles.

The back layer 130 located on the far side of the diaper 100 is made of a breathable and waterproof material, and faces the top layer 110. The back layer 130 is made of, for example, a PE film, a general water-repellent nonwoven fabric, or the like, or a medical waterproof nonwoven fabric and a general water-repellent nonwoven fabric.

Referring to fig. 5 and 6, the containment 140 for preventing liquid leakage from the lateral sides of the absorbent article is located at both lateral sides of the diaper 100, and has a fixed end 142 interposed and fixed between the topsheet 110 and the backsheet 130, a free end 144 opposite to the fixed end 142, and a connecting portion 143 interposed between the fixed end 142 and the free end 144. The fixed end 142 and the free end 144 are respectively bent toward the longitudinal center of the diaper 100 by the connecting portions 143 on the lateral sides of the diaper 100.

In the diaper 100 shown in fig. 5, the topsheet 110 wraps around the absorbent body 120 from the proximal side (the side closer to the wearer's skin) and forms the opening 112 at the distal side (the side farther from the wearer's skin). The area of facing layer 110 proximate opening 112 (attachment region S1) is attached to fixed end 142 of bib 140. As such, facing layer 110 forms an attached region S1 that is attached to one another and a free region S2 that is unattached to one another between the distal side and the cuff 140. Preferably, the top sheet 110 is not attached to the bib 140 (the connecting portion 143 of the bib 140) at both lateral sides, or is attached only at a very small number of positions, and the absorbent body 120 and the top sheet 110 are formed as a suspension structure suspended in the bib 140 and the back sheet 130.

For the above attachment area S1, it may be formed by a filled paste; or by heat sealing both face layer 110 and bib 140. It is to be understood that the attachment zone S1 is an area for implementing the fastening face layer 110, the absorbent body 120, the containment flaps 140. In the area of facing 110 corresponding to attachment region S1, facing 110 has a relatively low liquid conductivity due to wicking into the adhesive or heat sealing action.

It will be appreciated that since the top sheet 110 is joined to the absorbent body 120 in a manner "wrapped around the absorbent body 120", the absorbent body 120 is securely held inside the absorbent article even with a small amount of adhesive therebetween, which allows the absorbent body 120 to have a large contact area with the top sheet 110 on the side surface facing the wearer's skin, thereby facilitating liquid to rapidly enter the proximal side of the absorbent body 120 (the top side of the absorbent body 120 in fig. 5).

According to the present disclosure, when foreign matter such as urine flows to the surface layer 110, while a part of the foreign matter flows directly downward through the surface layer 110 to be absorbed by the near-side surface of the absorber 120 (the top surface of the absorber in fig. 5 and 6), another part of the foreign matter flows in order along the extending direction of the surface layer 110 through the lateral side and the far side of the absorber 120 (below the absorber 120) and is absorbed by each corresponding side surface of the absorber 120. This increases the speed at which the liquid is absorbed, and the liquid-absorbing capacity at the edge of the absorbent body 120 is also exhibited.

By virtue of locating attachment region S1 between facing layer 110 and bib 140 in the area adjacent opening 112, liquids such as urine can be channeled by facing layer 110 to a location adjacent opening 112. Thus, more area of the distal surface of the topsheet 110 (the lower surface of the topsheet 110 in fig. 5) can directly absorb liquid at a position where the distal surface of the topsheet 110 can be directed to be directed farther from the lateral edges of the diaper 100. This further increases the speed at which liquid is absorbed into the absorbent body 120, and the wearer can more quickly enter a dry state.

In the embodiment of fig. 5, 6, in conjunction with fig. 11, to ensure that liquid is able to flow the maximum distance on the distal surface of facing layer 110, the attachment region S1 between facing layer 110 and the fixed end 142 of apron 140 extends from the edge of facing layer 110 toward opening 112. Alternatively, the attachment zone S1 may also extend from a position at which the edge is slightly offset towards the lateral side edges of the pant diaper 100. For example, the offset distance is 3mm, 5mm, 10mm, etc.; or 1/20, 1/30, 1/40, etc., of the width W of the diaper 100. It should be understood that the attachment zones S1 of the above-described ranges all belong to the "area near the opening 112". The offset is particularly suitable for embodiments in which the attachment zones S1, S3 are formed by gluing, which avoids that the adhesive escapes through the opening 112, thereby directly bonding the absorbent body 120 to the backsheet 130 and thereby affecting the performance of the pant diaper 100.

With continued reference to fig. 5 and 11, the fixed end 142 of the cuff 140 interposed between the topsheet 110 and the backsheet 130 is disposed flush with the corresponding end of the topsheet 110 in the transverse direction of the absorbent article. Thus, the containment flaps 140 and the facing layer 110 collectively define a clean-edged opening 112 on the distal side of the absorbent body 120. The longitudinal center plane of the opening 112 is substantially coincident with the longitudinal center plane of the absorbent article.

Referring to fig. 6, which shows an alternative to fig. 5, in this embodiment the containment flaps 140 extend a short distance distally of the absorbent body 120, and the facing layer 110 is attached to the water repellent backing layer 130. In this embodiment, the fixed end 142 of the cuff 140 is attached to the water repellant backing 130, which facilitates maximum fluid flow distance from the distal surface of the facing layer 110. For other components of the diaper 100 of this embodiment, reference may be made to the above description of fig. 5, which is not described herein again.

The extension distance of the attachment region S3 and the free region S4 in fig. 6 can also be referred to the above description of fig. 5. In this embodiment, the attachment region S3 may be formed by filling an adhesive, heat sealing, or the like between the face layer 110 and the water repellent back layer 130.

With continued reference to fig. 5, 6 and 11, the total extension distance L in the transverse direction of the attachment zones S1, S3 between the facing layer 110 and the cuff 140, the water repellent backing layer 130 to each other₁Comprises the following steps: l is less than or equal to 5%₁L is 20% or less, wherein L is the extension of the absorbent body 120 in the transverse direction. In the diagrams of FIGS. 5, 6, 11, L₁Is the sum of the laterally extending distances L' of the left attachment regions S1, S3 and the right attachment regions S1, S3. The extension distance L is such that a firm joint between the layers is ensured₁A maximum extension of the surface layer 110 on the side of the absorption body 120 facing away from the skin of the wearer can be ensured.

As for the free areas S2, S4 formed between the face layer 110 and the containment 140, it is preferable that the extension distance D1 in the transverse direction of the free areas S2, S4 is set to 5mm, 10mm, 12mm, 15mm, or the like, depending on the model size of the diaper 100.

As shown in fig. 5 or 6, the bib 140 extends from the fixed end 142 around both lateral sides of the facing layer 110 toward the top side of the facing layer 110 adjacent the wearer's skin, with its free end 144 extending at the top side. As for the free end 144, it is configured to have a folded portion 144 of the opening 112 toward the lateral side of the absorbent article.

The fold 144, which can be seen in fig. 5, 6 and 7(a), includes a first portion 146 extending inwardly from the top surface and a second portion 148 extending in an opposite direction from the end of the first portion 146. The second portion 148 is provided with three or another number of elastic bodies 145 extending in the longitudinal direction (corresponding to the BB direction of fig. 3) as shown in fig. 5, 6 at a position toward the edge of the absorbent article. Optionally, the first and

second portions

146, 148 may also be provided with a third portion 147 extending vertically.

Referring to fig. 7 in conjunction with fig. 5 or 6, wherein fig. 7(a) schematically shows the folded portion 144 in the natural state of fig. 5, 6, fig. 7(b) shows the folded portion 144 just contacting the wearer's leg, and fig. 7(c) -7(e) schematically show the folded portion 144 after completion of wearing. When the wearer wears the diaper 100, the inner side of the folded portion 144 (corresponding to the top position of the third portion 147) is pressed first, and the second portion 148 naturally tilts upward and outward in an oblique manner from fig. 7(a) to the intermediate state of fig. 7 (b). The elastic bodies 145 of the second portion 144 are thus allowed to move outward from the lateral edges OO' of the diaper while avoiding the stress of the face layer 110, the backsheet 130, and the like. The elastic body 145 elastically stretches and directly contacts and locks to the thigh of the wearer. As the diaper 100 is further lifted, the first and

third portions

146 and 147 of the folded portion 144 are drawn by the second portion 148 locked to the thigh portion and gradually unfolded in the lateral direction of the diaper 100 into the final state shown in fig. 7(c) and 7(d), and when the leg circumference of the wearer is large, the folded portion 144 can even finally form the fully extended state shown in fig. 7 (e). It will be appreciated that in the fully extended state shown in fig. 7(e), the left side edge of the fold 144 is substantially flush with the lateral right side edge of the facing layer 110 of fig. 5 or 6.

Referring to fig. 11 in conjunction with fig. 5 and 6, the extension distance D in the transverse direction for the bent portion 144 is set to 20mm, 21mm, 25mm, 30mm, or the like. Referring to fig. 7(c) -7(e), the second portion 148 of the folded portion 144 can thereby form a leakage prevention region of a suitable height in a direction perpendicular to the absorbent body 120. The leakage-proof area can not cause the liquid to be directly sprayed to the leakage-proof surrounding edge to overflow due to overhigh height; also, referring to fig. 5 and 6, the leakage preventing regions do not reduce the absorption rate of the absorbent body 120 by extending too long to cover more of the topsheet 110 on the side closer to the wearer's skin.

Referring to fig. 3, the diaper 100 is provided with an elastic waist 160 for elastically attaching the absorbent article to a user. The elastic waist 160 includes a front waist region 161 corresponding to the abdomen of the user and a rear waist region 162 corresponding to the rear waist of the user, and the stretch magnification of the front waist region 161 is lower than that of the rear waist region 162. During respiration of a wearer such as an infant, the wearer may cause the diaper 100 to generate less pressure in an area corresponding to the abdomen by breathing. The elastic waist band 160 of the above form can produce a relatively uniform pressure feeling after being attached to the wearer, thereby providing a more comfortable user experience for the user.

When the diaper 100 is detached from the wearer's body, the excreta inside thereof easily overflow from the openings corresponding to the wearer's legs. In order to avoid such a situation, the diaper 100 is provided at the distal surface thereof with a disposal sticker 131 which has adhesiveness and is stuck together in a layered manner as shown in fig. 3 and 4. The exposed end portion of the disposal post 131 is not adhesive. After use, the user may pull the end of the discard post 131 so that the stacked discard posts 131 can be spread apart. Subsequently, the user wraps the unfolded disposal post 131 around the entire circumference of the diaper 100 such that the disposal post 131 is stuck end to end and the diaper 100 is thus wrapped in a small volume. At this time, the openings corresponding to the legs of the wearer are closed, and thus foreign matter does not overflow.

Preferably, the disposal post 131 is provided on the diaper 100 at a position corresponding to the back of the wearer.

According to the present disclosure, optionally, the diaper 100 is provided with the urine wetness indicating tape 132 extending in the longitudinal direction of the diaper 100 directly below the absorber 120. The urine wetness indicator tape 132 is preferably disposed at the widthwise center position of the diaper 100. Similarly, the diaper 100 is provided with a urine wetness indicator 133 extending in the transverse direction of the diaper 100 at a position adjacent to the elastic waist circumference 160. The urine

wetness indicator tapes

132 and 133 have a display agent therein, and can display different colors depending on the amount of urine in the diaper 100. The user can determine whether to replace the diaper 100 for the wearer based on the shade and color of the

wet display tapes

132 and 133.

With further reference to fig. 5, 6, according to a preferred embodiment, an absorbent body covering sheet 150 made of hydrophilic SMS nonwoven fabric or absorbent paper is provided between the proximal surface of the absorbent body 120 and the face layer 110. On the one hand, the absorber covering sheet 150 can quickly transmit urine or the like to the absorber 120, and on the other hand, the absorber covering sheet 150 helps to cover the granular or powder-like material inside the absorber 120, preventing the absorber 120 from forcing the material to leak out due to cutting or pressing during the production of the diaper 100.

The different forms of the absorbent covering sheet 150, the opening 112 formed in the distal surface of the face layer 110, have an influence on the overall performance of the diaper 100. The effect of providing each form of the absorber covering sheet 150 is described below with reference to the drawings. In each of the examples in the following table, except that the absorber covering sheet 150 is different in material, the material of each of the remaining corresponding layers is the same between the different examples. The form of each diaper 100 is seen in the following table:

referring to FIG. 8, the rewet performance of diapers 100 with different absorbent cover sheets 150 as measured using the GB/T28004 rewet test is shown; fig. 9 shows the absorbent body utilization rate of the diaper 100 corresponding to different absorbent body covering sheets 150.

In connection with examples 11 and 13, the smaller the width of the opening 112, the higher the amount of rewet. For openings 112 having a smaller width, the greater the back pressure experienced by facing layer 110 at the distal surface, and thus the greater the amount of rewet.

As is clear from examples 11, 12, and 14, the use of the spunlace nonwoven fabric as the absorbent body covering sheet 150 is not suitable as a material for producing the absorbent body covering sheet 150 because of its high rewet amount. The absorbent paper type absorbent body covering sheet 150 has the smallest amount of penetration.

According to the present application, the width D2 of the opening 112 formed in the surface layer 110 on the distal side of the absorber 120 is set to 15mm, 20mm, 25mm, or the like.

The top sheet 110 of the present invention is preferably made of a low water-retention fiber which hardly retains water, such as a water retention amount of 20mg/15ml, 30mg/15ml, 40mg/15ml, or 50mg/15 ml.

The present disclosure also relates to a surface layer 110 for adjusting the damp and hot environment inside the diaper 100. The existing surface layer has the characteristic of weak acidity, however, the applicant notices that the surface layer with weak acidity can only play a role in obviously inhibiting urease in a short time. The reduced urease inhibiting action of the facing layer may allow urea to be decomposed to produce ammoniacal substances that increase the PH after extended wear by the wearer. For this reason, the applicant has proposed a surface layer capable of effectively suppressing the increase in PH of the diaper over a long period of time. Specifically, the application adds a PH adjuster to the existing face layer 110 material. The pH regulator is selected from 0.05-1 wt% of tea polyphenols, 0.05-0.1 wt% of caprylhydroxamic acid or a mixture thereof. More preferably, the pH adjusting agent is present at a concentration of 0.05 wt% caprylhydroxamic acid, or a mixture of 0.3 wt% tea polyphenol and 0.05 wt% caprylhydroxamic acid. The dosage of the pH regulator is preferablyIs 7g/m²-10g/m². The pH value of the pH value regulator is 4.5-5.5.

It should be noted that the unit wt% of the concentration of tea polyphenol and caprylyl hydroxamic acid represents the weight ratio of tea polyphenol and caprylyl hydroxamic acid in the corresponding pH regulator. For example, 1 wt% of tea polyphenol means that the weight ratio of tea polyphenol in the pH adjustor is 1%, and the remaining component is distilled water. The dosage of the PH adjuster represents the weight of the PH adjuster applied per square meter of the facing.

The effect of the pH adjusting agent of each respective component will be described with reference to the following graph. The pH ratios of the examples are shown in the following table:

the weak acid nonwoven fabric used in the test was acidified to a pH of 4.93. The PH adjusting agent of each example was uniformly applied to each nonwoven fabric facing 110 by the coating process. The weight of the nonwoven fabric surface layer 110 was 1g, and the coating weight was 10g/m²The amount of (c) is applied.

During the test, 5mL of urease solution which is prepared from citric acid-potassium hydroxide buffer solution and has the pH value of 6.7 is added to 1g of non-woven fabric to be tested. After 5 minutes of full contact, 40mL of artificial urine was added. The PH of the mixed solutions of the examples and comparative examples was then determined at various time points. The data of the PH value can be seen in fig. 10, in which the abscissa of fig. 10 represents time (min) and the ordinate represents the PH value.

As can be seen from examples 1 to 6, the acidified nonwoven fabric topsheet 110 and the ordinary nonwoven fabric which is not acidified do not significantly affect the ph of the diaper 100. Examples 25 and 26 can maintain the ph of the diaper 100 within a preferable level range for a long period of time.

As is clear from the test shown in fig. 10, the PH adjuster of the above form can preferably suppress the urease in urine and feces from decomposing urea to generate ammonia, and thus maintain the diaper 100 in a desired PH range.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.

Description of reference numerals:

paper diaper: 100, respectively;

surface layer: 110;

an absorber: 120 of a solvent;

back layer: 130, 130;

protecting: 140 of a solvent;

an absorber covering sheet: 150;

elastic waist circumference: 160;

opening: 112, a first electrode;

discarding the paste: 131;

urine wet display belt: 132. 133;

fixing end: 142;

a connecting part: 143;

free end, bending part: 144, 144;

elastomer: 145;

a first part: 146;

and a third part: 147;

a second part: 148;

attachment zones: s1, S3;

a free region: s2, S4;

front waistline region: 161;

a rear waistline region: 162.

Claims

1. an absorbent article, comprising:

a facing layer in direct contact with the wearer's skin and configured to enable liquid to pass therethrough;

the back layer is arranged opposite to the surface layer and is positioned on one side far away from the skin of a wearer, and the back layer is made of breathable and waterproof materials;

an absorbent body disposed between the face layer and the back layer for absorbing and retaining the liquid; and

a containment flap including a fixed end secured between the topsheet and the backsheet and a free end opposite the fixed end, the containment flap for preventing leakage of the liquid from a lateral side of the absorbent article;

the method is characterized in that: the facing layer wraps around the absorbent body from the side close to the wearer's skin and forms an opening at the side remote from the wearer's skin, and the area of the facing layer close to the opening is attached to the fixed end of the cuff or to the backing layer.

2. The absorbent article of claim 1, wherein the region where the facing layer and the containment or back layer are attached to each other extends from the edge side toward the opening.

3. The absorbent article of claim 2, wherein the fixed end of the containment flap is interposed between the facing layer and the backing layer and is flush with the corresponding end of the facing layer in the transverse direction of the absorbent article.

4. The absorbent article of claim 1, wherein a longitudinal center plane of the opening substantially coincides with a longitudinal center plane of the absorbent article.

5. The absorbent article according to claim 2, wherein the region where the topsheet and the cuff or the backsheet are attached to each other extends over a distance L in the transverse direction of the absorbent article₁Comprises the following steps:

5％*L≤L₁≤20％*L，

wherein L is an extension distance of the absorber in the transverse direction.

6. The absorbent article of any of claims 1-5, wherein the containment flap extends from the fixed end around both lateral sides of the facing layer to the top surface of the facing layer on the side closer to the wearer's skin and the free end extends at said top surface, wherein said free end is configured as a fold having an opening towards the lateral side of the absorbent article.

7. The absorbent article of claim 6 wherein the fold comprises a first portion extending inwardly of the top surface and a second portion extending in an opposite direction from an end of the first portion.

8. The absorbent article of claim 7, wherein the second portion is provided with at least one longitudinally extending elastic body at a location toward an edge of the absorbent article.

9. The absorbent article of claim 8, wherein the extension distance D of the fold in the transverse direction at the top surface is: d is more than or equal to 20mm and less than or equal to 30 mm.

10. An absorbent article as defined in claim 1, wherein said topsheet comprises a PH adjusting agent selected from the group consisting of 0.05-1 wt% tea polyphenols, 0.05-0.1 wt% caprylhydroxamic acid, and combinations thereof.

11. An absorbent article as defined in claim 10, wherein said PH adjusting agent is present at a concentration of 0.05 wt% caprylhydroxamic acid or a mixture of 0.3 wt% tea polyphenol and 0.05 wt% caprylhydroxamic acid.

12. The absorbent article of claim 10 or 11, wherein the dosage of the PH adjuster is 7g/m²-10g/m²。

13. The absorbent article of claim 12, wherein the PH adjuster has a PH of 4.5 to 5.5.

14. The absorbent article of claim 1, wherein the absorbent article includes an elastic waist circumference for elastically attaching the absorbent article to a user, the elastic waist circumference includes a front waist region corresponding to the abdomen of the user and a rear waist region corresponding to the waist of the user, and a stretch magnification of the front waist region is lower than a stretch magnification of the rear waist region.

15. An absorbent article as claimed in any one of claims 1-5, characterized in that the surface layer is spaced apart from the backing layer or the skirt in a part-area of the side facing away from the wearer's skin to form a free zone, and that the free zone has an extension distance D1 in the transverse direction of the absorbent article of: d1 is more than or equal to 5mm and less than or equal to 15 mm.

16. The absorbent article of any of claims 1-5, wherein the absorbent article comprises an absorber covering sheet positioned between the topsheet and the absorber, the absorber covering sheet being a hydrophilic SMS nonwoven fabric or absorbent paper.

17. The absorbent article of claim 16, wherein the width D2 of the opening is: d2 is not less than 15mm and not more than 25 mm.

18. The absorbent article according to claim 17, wherein the absorbent comprises fluff pulp, water-absorbent polymer resin particles, or ES fibers.

19. The absorbent article of claim 1, wherein the topsheet comprises low-water-retention fibers having a water retention capacity of 20mg/15ml to 50mg/15 ml.

20. The absorbent article of claim 1, wherein the absorbent article is a pant-type diaper that can be worn directly.