JP2012000252A - Absorbent article, disposable diaper, underpants type disposable diaper, and method of manufacturing absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article, a disposable diaper, and an underpants type disposable diaper which permit the use efficiency of an entire absorbing core to be improved, and a method of manufacturing the absorbent article.SOLUTION: The disposable diaper includes a top portion 11 extending in the vertical direction Y at the center of the transverse direction X, an inside sheet material 5 extending in the vertical direction Y at both sides of the transverse direction X of the top portion 11 and having right and left side portions 12 having liquid impermeability, an outside sheet material arranged on the external surface side of the inside sheet material 5 and having liquid impermeability, and the absorbing core having an absorbing raw material absorbing a water content and arranged between the inside sheet material 5 and the outside sheet material. The top portion 11 is formed of a continuous sheet having a plurality of liquid permeable areas 111 having liquid permeability and a plurality of liquid impermeable areas 112 having liquid impermeability. The liquid permeable areas 111 and the liquid impermeable areas 112 extend in the vertical direction Y, and are alternately arranged with respect to the transverse direction X.

Description

  The present invention relates to an absorbent article, a disposable diaper, a pants-type disposable diaper, and a method for manufacturing the absorbent article, which are worn in an area including a wearer's crotch.

  There exists a thing of patent document 1 as a conventional absorbent article. In this conventional absorbent article, the central portion in the lateral direction of the inner sheet member disposed on the skin surface side of the absorbent core is the mesh region (101M). Thereby, the central part in the lateral direction of the inner sheet is more easily permeable to liquids such as urine than the other parts. For this reason, when urination is performed with this absorbent article attached, urine immediately passes through the mesh region of the inner sheet member and reaches the absorbent core. As a result, the absorption of urine by the absorption core tends to be concentrated and proceed to the urination area near the urination area of the wearer. Thus, if the absorption of urine by the absorption core is too biased toward the region near the urination port, the amount of urine absorbed in the region other than the region near the urination port still has room for the absorption capacity, but the urine in the region near the urination port May reach the limit of absorption capacity. If urination is further performed in this state, urine is not absorbed in the region near the urination opening of the absorption core, so the amount of urine absorbed per unit time by the absorption core is the amount of urination per unit time by the wearer. Urine may leak out of the absorbent article. For this reason, the urine absorption amount in the region near the urination port is close to the limit of the absorption capacity, regardless of whether the urine absorption amount has sufficient margin for the absorption capacity in the region other than the region near the urination port of the absorption core. Once reached, it may be necessary to replace the absorbent article. In this case, a large amount of absorbent material such as pulp and absorbent polymer contained in the absorbent core is discarded, which is inefficient. Since the absorbent core used in the absorbent article is longer in the vertical direction (front-rear direction) than in the horizontal direction, the use efficiency of the absorbent material tends to be poor at the front and rear edges in the vertical direction of the absorbent core.

Japanese Patent Laid-Open No. 2007-90056

  Then, the problem which should be solved of this invention is providing the manufacturing method of the absorbent article which can improve the use efficiency of the whole absorption core, a disposable diaper, a pants-type disposable diaper, and an absorbent article.

  In order to solve the above-mentioned problem, in the invention of claim 1, an absorbent article to be attached to a region including a wearer's crotch, the top portion extending along the vertical direction at the center in the horizontal direction, An inner sheet material having left and right side parts extending along the vertical direction on both sides in the lateral direction of the top part and having liquid impermeability, and disposed on the outer surface side of the inner sheet material, impervious to liquid An outer sheet material having an absorbent material that absorbs moisture, and an absorbent core disposed between the inner sheet material and the outer sheet material, wherein the top portion of the inner sheet material is transparent. It is formed by a continuous sheet having a plurality of liquid-permeable regions having liquid properties and a plurality of liquid-impermeable regions having liquid-impervious properties, and the liquid-permeable regions and the liquid-impermeable regions are arranged in the longitudinal direction. Extending along and alternating with the transverse direction It has been.

  Moreover, in the invention of Claim 2, in the absorbent article according to the invention of Claim 1, the left and right side portions of the inner sheet material are the edge portions on the inner side in the lateral direction of the side portions, Each side has a pleat portion provided along the longitudinal direction on the skin surface side of the side portion, and the absorbent article extends along the longitudinal direction at the front end portions of the left and right pleat portions of the inner sheet portion. Left and right elastic members that are respectively provided in a state where the left and right pleats are raised toward the skin surface of the wearer, and the liquid permeable liquid is provided at both lateral edges of the top portion. The area is arranged.

  Moreover, in invention of Claim 3, in the absorbent article which concerns on invention of Claim 1 or Claim 2, the said liquid permeable area | region of the said top part of the said inner side sheet material has the hydrophobicity which comprises the said top part. It is formed by performing a hydrophilic treatment for imparting hydrophilicity to a part of the nonwoven fabric sheet.

  Moreover, in invention of Claim 4, it is a disposable diaper provided with the absorbent article which concerns on invention of any one of Claim 1 thru | or 3, Comprising: The said invention which concerns on any one of Claim 1 thru | or Claim 3 A diaper main body constituted by an absorbent article; an adhesive sheet applied to the front side in the vertical direction on the outer surface side of the diaper main body; and edges on both sides in the horizontal direction on the rear side in the vertical direction of the diaper main body And left and right fastening members that are detachably attached to the attachment sheet.

  Moreover, in invention of Claim 5, it is a underpants type disposable diaper provided with the absorbent article which concerns on invention of any one of Claim 1 thru | or 3, Comprising: A front part, a back part, the said front part, and the said An exterior material having a crotch portion provided between the back portion and the lateral edge of the front abdomen and the lateral edges of the back portion of the back portion; It is comprised by the said absorbent article which concerns on invention of any one of Claim 1 thru | or 3, and is provided with the interior material provided to the skin surface side of the said exterior material.

  Moreover, in invention of Claim 6, it is a manufacturing method of the absorbent article which concerns on invention of Claim 1, Comprising: (a1) The said liquid permeability of the nonwoven fabric sheet which has the hydrophobicity which comprises the said top part of the said inner side sheet material Obtaining the inner sheet material including the top portion having the liquid-permeable region and the liquid-impervious region by applying a hydrophilic treatment to impart hydrophilicity to a portion where the region is to be formed; (a2) Sandwiching the absorbent core between the inner sheet material and the outer sheet material.

  Further, in the invention of claim 7, in the method for manufacturing an absorbent article according to the invention of claim 6, in the step (a1), a roller having a hydrophilic agent applied to the outer peripheral surface is brought into contact with the nonwoven fabric sheet. The hydrophilic agent is applied to the portion to be imparted with liquid permeability of the nonwoven fabric sheet.

  According to the absorbent article which concerns on invention of Claim 1, the top part of an inner side sheet material has several liquid-permeable area | region which has liquid permeability, and several liquid-impermeable area which has liquid-imperviousness. The liquid-permeable regions and the liquid-impermeable regions extend along the vertical direction and are alternately arranged in the horizontal direction. For this reason, when the excreted urine advances while spreading along the skin side surface of the top portion of the inner sheet material, the urine tends to spread in the vertical direction in each liquid-impermeable region. The spread in the direction is improved. That is, on the skin surface side surface of the top portion of the inner sheet material, urine is effectively diffused in the vertical direction from the vicinity of the urination port, and passes through each liquid-permeable region of the top portion to reach the absorption core. For this reason, absorption of urine proceeds in a wide range in the longitudinal direction of the absorption core. As a result, the absorption of urine is prevented from excessively deviating in the region near the urination opening of the absorption core, and the usage efficiency of the entire absorption core (especially the usage efficiency of the edges on both sides in the longitudinal direction of the absorption core) is reduced. Can improve.

  According to the absorbent article which concerns on invention of Claim 2, while being provided in the edge part of the inner side of the horizontal direction of a side part in the right and left side part of an inner side sheet material, the horizontal direction of a top part The liquid-permeable area | region is arrange | positioned at the edge part of both sides of. Therefore, for the urine that reaches the edges on both sides in the lateral direction of the top portion along the skin side surface of the top portion and is blocked by the pleat portions of the side portion, the liquid permeation provided at the edge portion It can permeate | transmit rapidly to the absorption core side through an area | region. As a result, the excreted urine collects on both lateral edges of the top portion, that is, on the inner side in the lateral direction of the base end portion of the pleat portion, and the collected urine gets over the pleat portion and absorbs it. It is possible to prevent leakage to the outside of the article.

  According to the absorbent article which concerns on invention of Claim 3, the liquid-permeation area | region of a top part is given by performing the hydrophilic treatment which provides hydrophilicity to a part of hydrophobic nonwoven fabric sheet which comprises a top part. Therefore, a top portion having a liquid-permeable region and a liquid-impervious region and an inner sheet material having the top portion can be easily and inexpensively formed without using an expensive hydrophilic nonwoven fabric.

  Moreover, applying a hydrophilic treatment to the nonwoven fabric sheet is a simple treatment such as application of a treatment agent, and the production line of the absorbent article is not complicated.

  According to the invention described in claim 4, it is possible to suppress the urine absorption from excessively deviating in the vicinity of the urination opening of the absorption core, and to improve the use efficiency (particularly, both sides of the absorption core in the longitudinal direction). The disposable diaper which can improve the use efficiency of the edge of the lip can be provided.

  According to the fifth aspect of the present invention, it is possible to suppress the urine absorption from excessively deviating in the vicinity of the urination opening of the absorption core, and to improve the use efficiency (particularly, both sides of the absorption core in the longitudinal direction). A pants-type disposable diaper that can improve the efficiency of use of the edge of the garment can be provided.

  According to the invention described in claim 6, the liquid permeability region of the top portion is formed by applying a hydrophilic treatment to impart hydrophilicity to a part of the hydrophobic nonwoven fabric sheet constituting the top portion. Without using an expensive hydrophilic nonwoven fabric, a top portion having a liquid-permeable region and a liquid-impervious region and an inner sheet material having the top portion can be formed easily and inexpensively.

  Moreover, applying a hydrophilic treatment to the nonwoven fabric sheet is a simple treatment such as application of a treatment agent, and the production line of the absorbent article is not complicated.

  According to the invention described in claim 7, the application of the hydrophilic agent to the nonwoven fabric sheet for forming the top portion of the inner sheet material is performed by transferring the hydrophilic agent applied to the outer peripheral surface of the roller to the nonwoven fabric sheet. Therefore, the hydrophilic agent can be applied quickly and reliably to the portion of the nonwoven sheet to which water permeability should be imparted.

  Further, by changing the application pattern when applying the hydrophilic agent to the outer peripheral surface of the roller, it is possible to easily cope with the difference in the shape or arrangement of the portion of the nonwoven fabric sheet to which liquid permeability should be applied.

It is a top view showing the state where the disposable diaper concerning a 1st embodiment of the present invention (henceforth only "diaper") was developed in the shape of a plane. It is a figure which shows typically the structure of the cross section along the A1-A1 line | wire of the diaper of FIG. It is a figure which shows the structure of the top part of the inner side sheet | seat material of the diaper of FIG. It is a figure which shows the manufacturing process of the diaper of FIG. It is a figure which shows the manufacturing process of the diaper of FIG. It is a figure which shows the mode of the hydrophilic treatment process in which a hydrophilic treatment is given to a nonwoven fabric sheet continuous body. It is a figure which shows the mode of the elastic member provision process and adhesive application | coating process in which an elastic member and an adhesive agent are provided to a nonwoven fabric sheet continuous body. It is a figure which shows the mode of the pleat tip folding process at the time of the fold part of a nonwoven fabric sheet continuous body being folded. It is a figure which shows the mode of the pleat tip folding process at the time of the fold part of a nonwoven fabric sheet continuous body being folded. It is a figure which shows typically the structure of the cross section along the A2-A2 line of the nonwoven fabric sheet continuous body of FIG. It is a figure which shows the mode of the fold base end folding process at the time of the fold part of a nonwoven fabric sheet continuous body being folded. It is a figure which shows the mode of the fold base end folding process at the time of the fold part of a nonwoven fabric sheet continuous body being folded. It is a figure which shows typically the structure of the cross section along the A3-A3 line | wire of the nonwoven fabric sheet continuous body of FIG. It is a figure which shows the modification of a structure of the diaper shown in FIG. It is a top view when the underpants type disposable diaper which concerns on 2nd Embodiment of this invention (henceforth a "pants type diaper" only) is cut | disconnected from the right and left side junction part, and expand | deployed in substantially planar shape. It is sectional drawing which shows typically the structure of the cross section along the A4-A4 line of the underpants type diaper of FIG.

  With reference to FIG. 1 thru | or FIG. 3, the diaper 1 which concerns on one Embodiment of this invention is demonstrated. In addition, in this specification and drawing, the horizontal direction X respond | corresponds to a wearer's left-right direction, and the vertical direction Y respond | corresponds to a wearer's front-back direction or an up-down direction. The upper side in FIG. 1 corresponds to the rear side with respect to the wearer. Moreover, although the absorbent article 1 which concerns on this embodiment is a tape-type disposable diaper provided with the right and left fastening member 4 mentioned later, the technique which concerns on this embodiment is spread | laid on the skin surface side of a diaper as a modification. You may apply to the urine absorption pad to be inserted.

  A diaper 1 according to this embodiment is attached to a region including a wearer's crotch, and as shown in FIGS. 1 and 2, a diaper main body 2, an adhesive sheet 3, and left and right fastening members. 4. The diaper main body 2 corresponds to an absorbent article according to the present invention, and includes an inner sheet material 5, an outer sheet material 6, an absorbent core 7, and left and right elastic members 8.

  The inner sheet material 5 of the diaper main body 2 has a top portion 11 and left and right side portions 12 and is constituted by a continuous sheet. In the present embodiment, the inner sheet material 5 is formed by applying a hydrophilic treatment that imparts hydrophilicity to a part of the nonwoven fabric sheet using a continuous nonwoven fabric sheet formed of a hydrophobic resin material. (A detailed manufacturing method will be described later). The top part 11 extends along the longitudinal direction Y at the center of the inner sheet material 5 in the lateral direction X, and at least a part thereof has liquid permeability.

  Specifically, as shown in FIG. 3, the top portion 11 has a plurality of liquid-permeable regions 111 having liquid permeability and a plurality of liquid-impermeable regions 112 having liquid-impervious properties. In FIG. 3, each region to which the broken line hatching in the top portion 11 is given is a liquid-permeable region 111, and each plain region to which no hatching or the like is given is a liquid-impermeable region 112. The liquid permeable regions 111 and the liquid impermeable regions 112 extend along the vertical direction Y and are alternately arranged with respect to the horizontal direction X. In the present embodiment, the edge portions on both sides in the lateral direction X of the top portion 11 are the liquid-permeable regions 111.

  In the configuration shown in FIG. 3, five liquid-permeable regions 111 and four liquid-impervious regions 112 are provided, but the present invention is not limited to this, and two, three, four, or six or more liquid-permeable regions 111 are provided. The impermeable region 112 may also be provided in two, three, or five or more.

  The left and right side portions 12 extend along the longitudinal direction Y on both sides of the top portion 11 in the lateral direction X and have liquid impermeability. Each of the left and right side portions 12 has a pleat portion 13 formed by folding a part of the left and right side portions 12 along the longitudinal direction Y toward the skin surface of the wearer. The pleat portion 13 is provided on the inner edge of the side portion 12 in the lateral direction X such that the base end portion 131 is adjacent to the outer edge portion of the top portion 11 in the lateral direction X. . The folded side portions of the side portion 12 constituting the pleat portion 13 are adhesive (for example, hot melt adhesive) or fusion (heat fusion or ultrasonic wave) at least at the base end portion 131 of the pleat portion 13. It is joined by joining means such as fusion, and is fixed in a folded state by this. In the present embodiment, an adhesive (for example, hot melt adhesive) 14 is used as the joining means. And the part of the both sides by which the side part 12 which comprises the pleat part 13 was folded together by the adhesive agent 14 is joined in the base end part 131 of the pleat part 13.

  The left and right elastic members 8 are respectively applied to the distal end portions 132 of the left and right pleat portions 13 of the inner sheet material 5 in a state of being stretched along the vertical direction Y, and the left and right pleat portions 13 are attached to the wearer's by the contraction force. Stand up toward the skin side. In the present embodiment, the elastic member 8 is provided so as to be sandwiched between the folded portions of the pleat portion 13. As the elastic member 8, for example, a thread-like rubber material or the like is used. The three-dimensional gather 15 is formed by the pleat portion 13 and the elastic member 8. The three-dimensional gather 15 prevents side leakage of excrement such as urine from the left and right edges of the crotch portion of the diaper 1 to the outside. In addition, you may abbreviate | omit about this solid gather 15 (namely, the pleat part 13 and the elastic member 8).

  The outer sheet material 6 has liquid impermeability, is disposed on the outer surface side of the inner sheet material 5, and sandwiches the absorbent core 7 with the inner sheet material 5. More specifically, the outer sheet material 6 is composed of, for example, a composite sheet obtained by bonding a liquid-impermeable resin film and a nonwoven fabric. The outer sheet material 6 prevents urine or the like that has oozed out of the absorbent core 7 from leaking out of the diaper 1.

  The absorbent core 7 includes an absorbent material that absorbs moisture, and is disposed between the inner sheet material 5 and the outer sheet material 6. Examples of the absorbent material include a fiber assembly made of pulp or the like, or a pad containing an absorbent polymer. Moreover, you may wrap the absorption material which consists of fiber assemblies etc. with packaging sheets, such as tissue paper.

  The adhesion sheet 3 is formed of a sheet-like member in which an adhesion element 17 provided on the left and right fastening members 4 to be described later can be attached and detached. It joins by joining means, such as.

  The left and right fastening members 4 are configured to include a base sheet 16 and an attachment element 17 provided on the skin surface side surface of the base sheet 16, and are used as a fixture when the diaper 1 is attached to a wearer. Have a role. The base material sheet 16 is formed of a sheet material such as a non-woven fabric, and an inner edge in the lateral direction X has an adhesive or the like on both edges in the lateral direction X on the rear side in the longitudinal direction Y of the diaper body 2. It is joined by the joining means. In the present embodiment, the inner sheet material 5 and the outer sheet material 6 of the base sheet 16 are sandwiched between the inner sheet material 5 and the outer sheet material 6 in the lateral direction X in the lateral direction X. It is joined to either one or both by a joining means such as an adhesive.

  As long as the attachment element 17 and the attachment sheet 3 are detachably attached to each other, any configuration can be adopted. As a specific example, for example, a configuration using a hook material having a plurality of hook structures as the attachment element 17 and using a loop material having a plurality of loop structures in which the hook structure of the hook material is detachably engaged as the attachment sheet 3. Is mentioned. As another specific example, there is a configuration in which an adhesive sheet to which an adhesive substance is applied is used as the adhesion element 17 and a sheet material having an adhesion surface to which the adhesive sheet is detachably attached is used as the adhesion sheet 3.

Next, with reference to FIG. 4 thru | or FIG. 13, the manufacturing method of the diaper 1 which concerns on this embodiment is demonstrated. The manufacturing method of this diaper 1 is as shown in FIG.
Inner sheet continuous body forming step S1,
Superposition process S2 and product division process S3
It has. The inner sheet continuous body forming step S1 is a process of forming an inner sheet continuous body 21 in which the inner sheet material 5 provided with the left and right elastic members 8 is continuously connected in the longitudinal direction Y. In the superimposing step S2, the outer sheet continuous body 22 in which the outer sheet material 6 is continuously continuous in the longitudinal direction Y is transported in the first transport direction B1 parallel to the longitudinal direction Y. In this step, the absorbent core 7 is provided on the skin surface side with an interval in the longitudinal direction Y, and the inner sheet continuous body 21 is superposed on the skin surface side of the outer sheet continuous body 22 from above the absorbent core 7. The product dividing step S3 is a step of cutting the inner sheet continuous body 21 and the outer sheet continuous body 22 overlapped so as to sandwich the absorbent core 7 into product units.

As shown in FIG. 5, the inner sheet continuous body forming step S1
Hydrophilic treatment step S11,
Elastic member application step S12 and pleat formation step S13
It has. In this embodiment, the hydrophilic treatment step S11 is performed before the elastic member application step S12 and the pleat formation step S13. However, the hydrophilic treatment step S11 is performed after the elastic member application step S12 or the elastic member application step S12 and the pleats. It may be performed after the formation step S13.

  In the hydrophilic treatment step S11, the nonwoven fabric sheet continuous body 23 in which the nonwoven fabric sheet having hydrophobicity for forming the inner sheet material 5 is continuously connected in the longitudinal direction Y is converted into a second transport direction B2 parallel to the longitudinal direction Y. A hydrophilic treatment for imparting hydrophilicity to a part of the nonwoven fabric sheet continuous body 23 to make it liquid-permeable is performed. In this hydrophilic treatment, the nonwoven fabric sheet continuous body 23 is passed between the hydrophilic agent application roller 24 and the auxiliary roller 25 disposed so as to face the hydrophilic agent application roller 24, and the nonwoven fabric sheet is passed through the hydrophilic agent application roller 24. The continuous body 23 is contacted. A hydrophilic agent is applied to the outer peripheral surface of the hydrophilic agent application roller 24 by a hydrophilic agent supply unit 26 so as to change a predetermined portion of the nonwoven fabric sheet continuous body 23 to be hydrophilic. The application form of the hydrophilic agent applied to the outer peripheral surface of the hydrophilic agent application roller 24 corresponds to the arrangement form of the liquid-permeable region 111 to be formed in the portion corresponding to the top portion 11 of the nonwoven fabric sheet continuous body 23. ing.

  More specifically, it is necessary to form a plurality of liquid-permeable regions 111 in a streak shape along the second conveyance direction B2 in the nonwoven fabric sheet continuous body 23. Correspondingly, the hydrophilic agent supply unit 26 supplies the hydrophilic agent at an interval in the axial direction of the roller 24 with respect to the outer peripheral surface of the rotating hydrophilic agent application roller 24, thereby along the circumferential direction. A plurality of hydrophilic agent application regions extending in a streak shape are formed. And when the nonwoven fabric sheet continuous body 23 passes between the rollers 24 and 25, the hydrophilic agent provided to the some streaky hydrophilic agent provision area | region in the outer peripheral surface of the hydrophilic agent application roller 24 is the nonwoven fabric sheet continuous body 23. Is transferred to. The portion of the nonwoven fabric sheet continuous body 23 to which the hydrophilic agent has been transferred changes from hydrophobic to hydrophilic by the hydrophilic agent and has liquid permeability. On the other hand, the other part of the nonwoven fabric continuous sheet 23 to which the hydrophilic agent is not transferred remains hydrophobic and maintains a liquid-impermeable state. As a result, as shown in FIG. 6, a plurality of liquid-permeable regions 111 extending in a streak shape along the second transport direction B <b> 2 are formed in a predetermined portion of the nonwoven fabric sheet continuous body 23.

  In the elastic member applying step S12, the second side is spaced apart in the lateral direction X (that is, the width direction of the nonwoven fabric sheet continuous body 23) on the outer surface side of the nonwoven fabric sheet continuous body 23 transported in the second transport direction B2. The elastic members 8 are continuously applied in a state where the left and right elastic members 8 are stretched along the transport direction B2. More specifically, the elastic member application roller 27 and the auxiliary roller 28 are arranged on the conveyance path of the nonwoven fabric continuous sheet 23 so as to sandwich the nonwoven fabric continuous sheet 23. Then, between the elastic member applying roller 27 and the auxiliary roller 28, an adhesive (for example, hot melt adhesive) is applied to the outer peripheral surface, and the left and right elastic members 8 are stretched, and the nonwoven fabric sheet continuous body 23. Is passed. At this time, the left and right elastic members 8 are adjusted so as to be positioned on both sides in the lateral direction X (width direction) of the portion corresponding to the top portion 11 on the outer surface side of the nonwoven fabric sheet continuous body 23. As a result, as shown in FIG. 7, the left and right elastic members 8 are bonded to predetermined portions of the nonwoven fabric sheet continuous body 23 in a state of being stretched along the second transport direction B2. In the present embodiment, the adhesive for bonding the elastic member 8 to the nonwoven fabric sheet continuous body 23 is applied to the elastic member 8 side, but may be applied to the nonwoven fabric sheet continuous body 23 side. 7 and FIG. 8 and FIG. 9 described later, the illustration of the liquid-permeable region 111 shown in FIG. 6 is omitted for convenience.

The pleat formation step S13 is a step of forming the left and right pleat portions 13 on the nonwoven fabric sheet continuous body 23,
Adhesive application step S131,
Pleat tip folding step S132,
Pressurizing step S133 and fold proximal end folding step S134
It has. In this embodiment, the adhesive application step S131 is performed after the elastic material application step S12. However, the adhesive application step S131 is performed between the hydrophilic treatment step S11 and the elastic member application step S12. Also good. Further, the fold proximal end folding step S134 is performed after the elastic member applying step S12, the adhesive applying step S131, the pleat distal end folding step S132, and the pressurizing step S133. Various process orders can be employed, for example, between the process S11 and the elastic member application process S12.

  In adhesive application process S131, the above-mentioned adhesive (for example, hot-melt adhesive) 14 for joining the folded portions forming the pleat portions 13 of the nonwoven fabric sheet continuous body 23 is applied. More specifically, as shown in FIG. 7, an adhesive (for example, an adhesive (for example) , Hot melt adhesive) 14 is applied in a streak pattern along the second transport direction B2. In addition, when joining of the folded part which forms the pleat part 13 of the nonwoven fabric sheet continuous body 23 is performed by heat fusion or ultrasonic fusion, the adhesive application step S131 is omitted, instead, In the pressurizing step S133, the folded portion forming the pleat portion 13 of the nonwoven fabric sheet continuous body 23 is fused by a heat fusion unit or an ultrasonic fusion unit.

  In the pleat tip folding step S132, the nonwoven fabric sheet continuous body 23 conveyed in the second conveyance direction B2 is formed on the outer surface by a guide member (folding plate) 30 for folding along the left and right elastic members 8. The side surfaces are folded in the opposite folding direction. Two alternate long and short dash lines in FIG. 7 indicate the fold line L1. In the present embodiment, the folding process is performed first along one of the two folding lines L1 corresponding to the front end 132 of the left and right pleats 13 along the folding line L1. In the example shown in FIG. 8, the folding process along the right fold line L1 is performed first toward FIG. Subsequently, as shown in FIG. 9 and FIG. 10, folding is performed along the other folding line L1. In addition, when the edge part of the both sides of the width direction of the nonwoven fabric sheet continuous body 23 does not overlap when folded at the two folding lines L1, the folding process at the two folding lines L1 may be performed simultaneously.

  In the pressurizing step S133, the nonwoven fabric sheet continuous body 23 folded at two fold lines L1 is passed between two pressurizing rollers 31 and 32 disposed so as to face each other and pressed. As a result, the folding at the fold line L1 is further ensured, and the folded portions forming the pleat portions 13 of the nonwoven fabric sheet continuous body 23 are joined by the adhesive 14.

  In the fold base end folding step S134, the nonwoven fabric sheet continuous body 23 transported in the second transport direction B2 is along the outer side portion of the lateral direction X corresponding to the base end portion 131 of the left and right pleat portions 13. The skin surface side surface is folded in the opposing folding direction by a folding guide member (folded plate) 33. Two alternate long and short dash lines in FIG. 9 indicate the fold line L2, and an arrow P1 in FIG. 10 indicates a fold position corresponding to the fold line L2.

  In the present embodiment, as shown in FIG. 11, among the two fold lines L2 corresponding to the outer side portions in the lateral direction X of the base end portions 131 of the left and right pleat portions 13, the above-mentioned two fold lines L1. The folding process is performed first along the folding line L2 on the side folded from the back (left side as viewed in FIG. 11 in the example shown in FIG. 11). Subsequently, as shown in FIGS. 12 and 13, folding is performed along the other folding line L2. In addition, when the edge part of the both sides of the width direction of the nonwoven fabric sheet continuous body 23 does not overlap when it folds in the above-mentioned two fold line L1, you may perform a folding process in the two fold lines L2 simultaneously. .

  In addition, as a modification of the fold base end folding step S134, a portion on the inner side in the lateral direction X corresponding to the base end portion 131 of the left and right pleat portions 13 of the nonwoven fabric sheet continuous body 23 (portion indicated by an arrow P2 in FIG. 10). The nonwoven fabric sheet continuous body 23 may be folded along the folding direction in which the skin surface side surface is opposed by a folding guide member (folded plate) 33. Moreover, in order to make the folding more securely at the fold line L2 of the nonwoven fabric sheet continuous body 23, a pressing step using two pressing rollers facing up and down may be added to the subsequent stage of the fold base end folding step S134. Further, as described above, various orders can be adopted for the execution order of the fold base end folding step S134 for the other steps S12, S132, and the like.

  As shown in FIG. 13, the nonwoven fabric sheet continuous body 23 folded at two fold lines L <b> 2 includes a portion corresponding to the top portion 11 of the inner sheet material 5, and a lateral direction X of the pleat portion 13 in the left and right side portions 12. The part corresponding to the part on the outer side is connected in a substantially planar shape. Further, the portions corresponding to the left and right folds 13 are folded outward in the lateral direction X. The nonwoven fabric sheet continuous body 23 processed in this way is sent to an overlapping step S <b> 2 where the outer sheet continuous body 22 is overlapped as the inner sheet continuous body 21.

As shown in FIG.
Adhesive application step S21,
Absorbent core application step S22, and inner sheet application step S23
It has. In the adhesive application step S21, an adhesive (for example, hot melt adhesive) is applied by the adhesive application unit 36 to the skin surface side of the outer sheet continuous body 22 conveyed in the first conveyance direction B1. This adhesive is used for joining the outer sheet continuous body 22 and the absorbent core 7 and joining the outer sheet continuous body 22 and the inner sheet continuous body 21.

  In the absorbent core application step S22, the absorbent core 7 supplied from the absorbent core supply line 37 is first conveyed by the transfer roller 38 on the skin surface side of the outer sheet continuous body 22 conveyed in the first conveyance direction B1. Sequentially applied at intervals in the direction B1. The applied absorbent core 7 is joined to the outer sheet continuous body 22 by an adhesive applied to the outer sheet continuous body 22. An auxiliary roller 39 is disposed below the transfer roller 38, and the outer sheet continuous body 22 passes between the transfer roller 38 and the auxiliary roller 39.

  In the inner sheet application step S23, two pressure rollers 40 in which the inner sheet continuum 21 supplied from the inner sheet continuum formation step S1 and the outer sheet continuum 22 provided with the absorbent core 7 form a pair of upper and lower sides, 41 is passed. Thereby, the inner sheet continuous body 21 is superimposed on the skin surface side of the outer sheet continuous body 22 from above the absorbent core 7 and joined. At this time, the inner sheet continuous body 21 is overlapped with the outer sheet continuous body 22 so that the pleat portion 13 is located on the skin surface side.

  In the product dividing step S3, the inner sheet continuous body 21 and the outer sheet continuous body 22 which are overlapped and bonded via the absorbent core 7 are passed between the cutter roller 42 and the anvil roller 43, and are cut into product units. Thereby, the diaper 1 is obtained.

  Although omitted in the above description regarding the manufacturing process for the sake of simplification, in the actual manufacturing process of the diaper 1, the process of joining the adhesion sheet 3 to the outer surface side of the outer sheet continuous body 22, the inner sheet continuous body 21 or the outer side. The process includes joining the left and right fastening members 4 to the sheet continuum 22 and molding the outer shapes of the left and right sides of the diaper 1.

  As described above, according to the diaper 1 according to the present embodiment, the top portion 11 of the inner sheet material 5 has a plurality of liquid-permeable regions 111 having liquid-permeability as shown in FIG. The liquid-permeable regions 111 and the liquid-impermeable regions 112 extend along the vertical direction Y and are alternately arranged with respect to the horizontal direction X. ing. For this reason, when the excreted urine advances while spreading along the skin surface side surface of the top portion 11 of the inner sheet material 5, the urine easily spreads in the longitudinal direction Y in each impermeable region 112, thereby The spread of urine in the longitudinal direction Y is improved. That is, on the skin surface side surface of the top portion 11 of the inner sheet material 5, while the urine is effectively diffused in the longitudinal direction Y from the vicinity of the urination opening, the absorbent core 7 passes through each liquid permeable region 111 of the top portion 11. To reach. For this reason, the absorption of urine proceeds in a wide range in the longitudinal direction Y of the absorption core 7. As a result, the absorption of urine is prevented from excessively deviating in the vicinity of the urination opening of the absorption core 7, and the use efficiency of the entire absorption core 7 (particularly, the edges of both edges in the longitudinal direction Y of the absorption core 7 is reduced). Use efficiency).

  Further, in the left and right side portions 12 of the inner sheet material 5, the pleat portions 13 are provided on the inner side edges in the lateral direction X of the side portions 12, and the top portions 11 are permeable to both side edges in the lateral direction X. A liquid region 111 is disposed. Therefore, the urine that reaches the edges on both sides in the lateral direction X of the top portion 11 along the skin surface side surface of the top portion 11 and is dammed up by the pleat portions 13 of the side portion 12, Through the provided liquid-permeable region 111, the absorption core 7 can be quickly transmitted. As a result, the excreted urine accumulates at both lateral edges of the top portion 11 in the lateral direction X, that is, at the inner side in the lateral direction X of the base end portion 131 of the pleat portion 13, and It is possible to prevent leakage to the outside of the diaper 1 by getting over.

  Further, the inner sheet material 5 having at least a top part 11 having liquid permeability and left and right side parts 12 having liquid impermeability is formed by a continuous sheet (nonwoven fabric sheet in the present embodiment). ing. Therefore, the configuration of the inner sheet material 5 can be simplified, and the waste of material due to the bonding of a plurality of sheet materials when forming the inner sheet material 5 can be eliminated. As a result, the structure is inexpensive with a simple configuration. The diaper 1 which can be manufactured can be provided.

  Further, by folding part of the left and right side portions 12 of the inner sheet material 5 along the longitudinal direction Y toward the skin surface of the wearer, a fold portion 13 that forms the three-dimensional gather 15 is formed. . As a result, the inner sheet material 5 having the three-dimensional gathers 15 can be formed while simplifying the configuration and the production line.

  Moreover, regarding the manufacturing method of the diaper 1, by applying a hydrophilic treatment to a part of the hydrophobic nonwoven fabric continuous body 23 for forming the inner sheet material 5 in the hydrophilic treatment step S11, one of the inner sheet material 5 is obtained. The inner sheet material 5 having a liquid-permeable portion and a liquid-impervious portion can be easily and inexpensively formed without using an expensive hydrophilic nonwoven fabric for the portion.

  Moreover, applying the hydrophilic treatment to the nonwoven fabric continuous sheet 23 is a simple treatment such as application of a hydrophilic agent, and the production line of the diaper 1 is not complicated.

  Further, since the hydrophilic agent is applied to the nonwoven fabric sheet continuum 23 by transferring the hydrophilic agent applied to the outer peripheral surface of the hydrophilic agent application roller 24 to the nonwoven fabric sheet continuum 23, the water permeability of the nonwoven fabric sheet continuum 23. The hydrophilic agent can be applied quickly and reliably to the portion to be applied.

  Further, the shape or arrangement of the portion to which the liquid permeability of the nonwoven fabric sheet continuous body 23 should be imparted by changing the imparting pattern when the hydrophilic agent is imparted to the outer peripheral surface of the hydrophilic agent application roller 24 by the hydrophilic agent supply unit 26. It is possible to easily cope with such differences.

  Further, in the pleat forming step S13, the nonwoven fabric sheet continuous body 23 is folded along the left and right elastic members 8 applied to the nonwoven fabric sheet continuous body 23 conveyed in the second conveyance direction B2 so that the outer surface side surfaces thereof face each other. While being folded in the direction, the portions forming the left and right pleat portions 13 in the folded portion of the nonwoven fabric sheet continuous body 23 are joined by the adhesive 14. For this reason, the inner sheet material 5 having the three-dimensional gathers 15 can be formed while simplifying the configuration and the production line.

  Moreover, while the nonwoven fabric sheet continuous body 23 is folded in the folding direction where the outer surface side surface opposes along the part to which the right and left elastic member 8 was provided, the base end part of the right and left pleat part 13 of the nonwoven fabric sheet continuous body 23 Along the outer side portion in the lateral direction X corresponding to 131, the nonwoven fabric sheet continuous body 23 is folded in the folding direction in which the skin surface side surface faces. Thereby, as described above, a portion corresponding to the top portion 11 in the formed inner sheet continuous body 21 and a portion corresponding to the outer side portion in the lateral direction X of the fold portion 13 in the left and right side portions 12 are formed. It will be in the state which continued in the shape of a substantially plane. As a result, it is possible to easily superimpose and join the inner sheet continuous body 21 and the outer sheet continuous body 22 on which the pleat portions 13 are formed.

  In addition, in the diaper 1 which concerns on this embodiment, although the inner sheet material 5 was comprised by the continuous nonwoven fabric sheet, as shown in FIG. 14, the top part 11 of the inner sheet material 5, and the left and right side parts 12 are made. You may form with a separate sheet | seat (for example, nonwoven fabric sheet). In the example shown in FIG. 14, it is comprised by the three nonwoven fabric sheets 46-48 by which the inner side sheet material 5 was bonded together. As the nonwoven fabric sheet 46 forming the top portion 11, a nonwoven fabric sheet made of a hydrophobic resin material is used, and a hydrophilic treatment is applied to a part thereof, as shown in FIG. A plurality of liquid-permeable regions 111 and a plurality of liquid-impermeable regions 112 are formed. The nonwoven fabric sheets 47 and 48 forming the left and right side portions 12 are nonwoven fabric sheets formed of a hydrophobic resin material.

  Next, with reference to FIG.15 and FIG.16, the underpants type diaper 10 which concerns on 2nd Embodiment of this invention is demonstrated. The upper side in FIG. 15 corresponds to the front side with respect to the wearer. The interior material 51 of the pants-type diaper 10 according to the present embodiment is similar in structure to the diaper body 2 of the diaper 1 according to the first embodiment described above, and corresponds to the diaper body 2 of the interior material 51. About the part, the duplication of description is avoided using the same referential mark.

  The pants-type diaper 10 according to the present embodiment includes an interior material 51 and an exterior material 52 as shown in FIGS. 15 and 16. The interior material 51 has a configuration similar to the diaper main body 2 of the diaper 1 according to the first embodiment described above. The difference between the interior material 51 and the diaper main body 2 is that in the interior material 51, the edges on both sides in the lateral direction X of the outer sheet material 6 wrap around the edges on the outer side in the lateral direction X of the absorbent core 7. 7 is wound on the skin surface side. For this reason, the edge part of the both sides of the horizontal direction X of the inner side sheet material 5 is made into the edge part of the both sides of the horizontal direction X where the outer side sheet material 6 was wound up with the adhesive (for example, hot melt adhesive) from the skin surface side. It is joined. Such an interior material 51 is joined to the skin surface side of an exterior material 52 described later by an adhesive (for example, a hot melt adhesive).

  The exterior material 52 has a front abdomen 521, a back part 522, and a crotch part 523 provided between the front abdomen 521 and the back part 522. Edges 521a on both sides in the lateral direction X of the front abdomen 521 and edges 522a on both sides in the lateral direction X of the back portion 522 are joined at the side joint 54 by welding or an adhesive.

  The exterior material 52 includes two base material sheets 71 and 72 that are overlapped. Nonwoven fabric or the like is used for the base sheet, and the front and rear leg elastic members 61 and 62, the front and rear body elastic members 63 and 64, and the front and rear sides are interposed between the base sheets. The waist elastic members 65 and 66 are sandwiched in an extended state.

  Also in the pants-type diaper 1 having such a configuration, a configuration substantially similar to that of the diaper 1 according to the first embodiment described above is obtained.

  In addition, also about the underpants type diaper 10 which concerns on this embodiment, like the structure shown in the above-mentioned FIG. 14, the top part 11 of the inner side sheet material 5, and the left-right side part 12 are used by a separate sheet | seat (for example, nonwoven fabric sheet). It may be formed.

  In the diaper 1 and the pants-type diaper 10 according to the first and second embodiments described above, the sheet material disposed on the skin surface side of the absorbent core 7 is only the inner sheet material 5, but the skin of the absorbent core 7. In addition to the inner sheet material 5, a sheet material may be additionally arranged on the surface side.

  1 diaper, 2 diaper body, 3 adhesive sheet, 4 fastening member, 5 inner sheet material, 6 outer sheet material, 7 absorbent core, 8 elastic member, 10 pants-type diaper, 11 top portion, 12 side portion, 13 pleat portion, 14 Adhesive, 15 Solid Gather, 16 Base Sheet, 17 Adhering Element, 21 Inner Sheet Continuous, 22 Outer Sheet Continuous, 23 Nonwoven Sheet Continuous, 24 Hydrophilic Agent Application Roller, 25 Auxiliary Roller, 26 Hydrophilic Agent Supply Unit , 27 Elastic member application roller, 28 Auxiliary roller, 29 Adhesive application unit, 30 Guide member, 31, 32 Pressure roller, 33 Guide member, 36 Adhesive application unit, 37 Absorption core supply line, 38 Transfer roller, 39 Auxiliary Roller, 40, 41 Pressure roller, 42 Cutter roller, 43 Ambi Roller, 46 to 48 Nonwoven fabric sheet, 51 Interior material, 52 Exterior material, 54 Side joint, 61, 62 Leg elastic member, 63, 64 Body elastic member, 65, 66 Waist elastic member, 111 Liquid permeable region, 112 Liquid permeable region, 131 base end, 132 tip, 521 front abdomen, 522 back, 523 crotch, B1 first transport direction, B2 second transport direction, L1, L2 folding line, S1 inner sheet continuum Formation process, S11 hydrophilic treatment process, S12 elastic member application process, S13 pleat formation process, S131 adhesive application process, S132 pleat tip folding process, S133 pressurization process, S134 fold proximal end folding process, S2 superposition process, S21 adhesive Application process, S22 absorption core application process, S23 inner sheet application process, S3 product division process, X lateral direction, Y Longitudinal direction.

Claims (7)

An absorbent article to be worn in an area including the wearer's crotch,
An inner sheet material having a top portion extending in the longitudinal direction at the center in the lateral direction, and left and right side portions extending along the longitudinal direction on both sides in the lateral direction of the top portion and having liquid impermeability; ,
An outer sheet material disposed on the outer surface side of the inner sheet material and having liquid impermeability;
Having an absorbent material that absorbs moisture, an absorbent core disposed between the inner sheet material and the outer sheet material;
With
The top portion of the inner sheet material is formed by a continuous sheet having a plurality of liquid-permeable regions having liquid permeability and a plurality of liquid-impermeable regions having liquid permeability.
The absorbent article, wherein the liquid-permeable region and the liquid-impermeable region extend along the longitudinal direction and are alternately arranged with respect to the lateral direction. The absorbent article according to claim 1,
The left and right side portions of the inner sheet material each have a pleat portion provided along the vertical direction on the skin surface side of the side portion at an edge on the inner side in the lateral direction of the side portion. And
The absorbent article is
Left and right elastic members that are applied to the distal end portions of the left and right pleat portions of the inner sheet portion in a state of being stretched along the longitudinal direction, and stand the left and right fold portions toward the skin surface of the wearer. Further comprising
The absorbent article, wherein the liquid-permeable region is disposed at both lateral edges of the top portion. In the absorptive article according to claim 1 or 2,
The liquid permeable region of the top portion of the inner sheet material is formed by subjecting a part of a hydrophobic nonwoven fabric sheet constituting the top portion to hydrophilic treatment to impart hydrophilicity. Absorbent article. A disposable diaper comprising the absorbent article according to any one of claims 1 to 3,
A diaper main body constituted by the absorbent article according to any one of claims 1 to 3,
An adhesion sheet applied to the front side in the longitudinal direction on the outer surface side of the diaper body;
Left and right fastening members that are provided at the edges on both sides in the lateral direction on the rear side in the longitudinal direction of the diaper body, and are detachably attached to the adhesion sheet;
A disposable diaper characterized by comprising. A pants-type disposable diaper comprising the absorbent article according to any one of claims 1 to 3,
A front abdomen, a back part, and a crotch part provided between the front abdomen and the back part, both lateral edges of the front abdomen and both lateral parts of the back part An exterior material joined to the edge of
An interior material constituted by the absorbent article according to any one of claims 1 to 3 and applied to a skin surface side of the exterior material;
A pants-type disposable diaper characterized by comprising: It is a manufacturing method of the absorptive article according to claim 1,
(a1) Applying a hydrophilic treatment for imparting hydrophilicity to a portion where the liquid-permeable region of the non-woven fabric sheet having hydrophobicity constituting the top portion of the inner sheet material is to be formed, thereby providing the liquid-permeable region and the non-permeable region. Obtaining the inner sheet material with the top portion having a liquid permeable region;
(a2) sandwiching the absorbent core between the inner sheet material and the outer sheet material,
A method for producing an absorbent article, comprising: In the manufacturing method of the absorptive article according to claim 6,
In the step (a1), the hydrophilic agent is applied to the portion to be imparted with liquid permeability of the nonwoven fabric sheet by bringing a roller provided with a hydrophilic agent on the outer peripheral surface thereof into contact with the nonwoven fabric sheet. A method for producing an absorbent article.

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