JP2011015886A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article capable of preventing an absorber from being wrinkled and capable of suppressing movement of super absorbent polymer (SAP) and suppressing leakage as well.SOLUTION: The tape-type disposable diaper 100 includes a top sheet 18, a back sheet 20, a plurality of absorbers 30 disposed between the top sheet 18 and the back sheet 20 and composing a layered structure consisting of a first absorbent layer 31 and a second absorbent layer 33, and an intermediate liquid permeable sheet 32a disposed between the first absorbent layer 31 and the second absorbent layer 33. The first absorbent layer 31 has three first absorbers 31a arranged separately from one another in the lateral direction, and the second absorbent layer 33 has two second absorbers 33a arranged separately from each other in the lateral direction. The two second absorbers 33a are respectively disposed to be laid on both adjacent first absorbers 31a of the three first absorbers 31a. These absorbers 30 are respectively disposed within a space partitioned by the intermediate liquid permeable sheet 32a.

Description

  The present invention relates to an absorbent article, and more specifically, it is possible to prevent the absorbent body between the top sheet and the back sheet from being swung, and to suppress the movement of the superabsorbent polymer. The present invention also relates to an absorbent article capable of suppressing leakage of excrement such as urine.

  Conventionally, absorbent articles are used in disposable diapers (including urine pads) that absorb excretory fluids such as urine, sanitary napkins that absorb menstrual blood, and cage sheets that absorb cages.

  Among these, for example, as a disposable diaper, a tape-type disposable diaper, a pants-type disposable diaper, and the like are known. Specifically, as a tape-type disposable diaper, it is composed of each part of the front body, the crotch part, and the back body, and is arranged so as to cover the surface of the absorbent body and the absorbent body. A back sheet made of a liquid-impermeable material and at least one on each of the left and right side edges of the back body. And a fastening tape for fastening the fastening tape, and a fastening region for fastening the fastening tape formed on the front body.

  According to such a tape-type disposable diaper, the excrement of the wearer is absorbed by the absorber through the liquid-permeable portion of the top sheet and is made of a liquid-impermeable material. Therefore, the excrement can be held inside the diaper.

  And the thing of the two-layer structure etc. which consist of two absorbers is not limited to the said absorber (refer patent documents 1-3). And when using the absorber of a 2 layer structure, what equips an intermediate | middle liquid-permeable sheet between the absorbers of a 2 layer structure like the diaper described in patent document 1 is known. Since the diaper having such an intermediate liquid permeable sheet can be absorbed by the other absorbent body after being diffused by the intermediate liquid permeable sheet, excrement that could not be absorbed by one absorbent body, The absorption rate of excrement is excellent.

Japanese Patent No. 3616077 Japanese Patent No. 40923319 Japanese Patent No. 3959339

  However, the tape-type disposable diapers described in Patent Documents 1 to 3 are worn by the absorbent body between the top sheet and the back sheet during wearing, or are super absorbent polymers (hereinafter referred to as “SAP”). Sometimes moved). In such a case, there is a problem that the feeling of wearing is bad, and wearing for a long time places a heavy burden on the wearer.

  The present invention has been made in view of the above-described problems of the prior art, and can prevent the absorber from swaying and suppresses the SAP from moving and being disposed at a biased position. Further, the present invention provides an absorbent article that can suppress excrement leakage.

  According to the present invention, the following absorbent article is provided.

[1] A top sheet at least partly made of a liquid permeable material, a back sheet made of a liquid impermeable material laminated on one surface side of the top sheet, and between the top sheet and the back sheet A plurality of absorbers constituting a laminated structure comprising a first absorbent layer and a second absorbent layer disposed closer to the backsheet than the first absorbent layer, and the first absorbent layer And an intermediate liquid permeable sheet disposed between the first absorbent layer and the second absorbent layer, wherein the first absorbent layer is arranged to be spaced apart from each other in the width direction. And the second absorbent layer has a plurality of second absorbers arranged spaced apart from each other in the width direction, and each of the plurality of second absorbers includes a plurality of the first absorbers. It is arranged so as to overlap both adjacent ones of one absorber It said plurality of absorber, respectively, the absorbent article disposed in said intermediate liquid space partitioned by the permeable sheet.

[2] A lower liquid-permeable sheet is further provided between the second absorbent layer and the back sheet, and the intermediate liquid-permeable sheet is disposed between the adjacent second absorbers and the lower liquid-permeable sheet. The absorbent article according to [1], wherein the second absorbent body is partitioned from each other by being bonded to a side liquid-permeable sheet or the back sheet.

[3] An upper liquid permeable sheet is further provided between the first absorbent layer and the top sheet, and the intermediate liquid permeable sheet is disposed between the adjacent first absorbent bodies. The absorbent article according to [1] or [2], wherein the first absorbent body is partitioned from each other by being bonded to the permeable sheet or the top sheet.

[4] The intermediate liquid permeable sheet according to [2] or [3], wherein the intermediate liquid permeable sheet is bonded to the lower liquid permeable sheet or the back sheet outside both side edges of the second absorbent layer. Absorbent articles.

[5] The intermediate liquid permeable sheet is bonded to the top sheet between the adjacent first absorbent bodies, and is bonded to the back sheet between the adjacent second absorbent bodies. The absorbent article according to [1], wherein the plurality of absorbers are partitioned from each other.

[6] The absorbent article according to [5], wherein the intermediate liquid-permeable sheet is joined to the back sheet on the outside of both side edges of the second absorbent layer.

  The absorbent article of the present invention can prevent the absorber from shaking, can suppress the SAP from moving, and further has the effect of suppressing the excretion leakage. It is.

It is a partially cutaway sectional view showing one embodiment of an absorptive article of the present invention, and is a figure showing the state where the absorptive article of the present invention was developed and seen from the top sheet side. It is an expanded sectional view which shows the A-A 'cross section of the absorbent article of FIG. It is an expanded sectional view which shows the lamination | stacking relationship of each component in the A-A 'cross section of the absorbent article of FIG. It is an expanded sectional view corresponding to FIG. 2 which shows another embodiment of the absorbent article of this invention. It is a perspective view which shows the foam drum which can be used for the manufacturing process of one Embodiment of the absorbent article of this invention. It is a perspective view which shows the foam drum which can be used for the manufacturing process of one Embodiment of the absorbent article of this invention.

  Hereinafter, although the form for implementing this invention is demonstrated, this invention is not limited to the following embodiment. That is, it is understood that modifications and improvements as appropriate to the following embodiments are also within the scope of the present invention based on ordinary knowledge of those skilled in the art without departing from the spirit of the present invention. Should be.

  The absorbent article of the present invention can be applied to disposable diapers (including urine pads) that absorb excretory fluids such as urine, sanitary napkins that absorb menstrual blood, and vaginal sheets that absorb vaginal discharge. . Hereinafter, the tape-type disposable diaper will be described.

[1] Absorbent article:
FIG. 1 shows a tape-type disposable diaper 100 which is an embodiment of the absorbent article of the present invention, and FIG. 2 shows a cross section AA ′ of the tape-type disposable diaper 100 (absorbent article) of FIG. It is an expanded sectional view shown. FIG. 3 is an enlarged cross-sectional view showing a stacking relationship of each component in the AA ′ cross section of the tape-type disposable diaper 100 of FIG. As shown in FIG. 3, an adhesive layer 47 made of hot melt is formed between the constituent elements.

  A tape-type disposable diaper 100 shown in FIG. 2 includes a top sheet 18 at least partly made of a liquid permeable material, and a back sheet 20 made of a liquid impermeable material laminated on one surface side of the top sheet 18. And a laminated structure comprising a first absorbent layer 31 and a second absorbent layer 33 disposed on the backsheet 20 side relative to the first absorbent layer 31, disposed between the top sheet 18 and the backsheet 20. A plurality of absorbers 30 to be configured, and an intermediate liquid permeable sheet 32a disposed between the first absorbent layer 31 and the second absorbent layer 33, wherein the first absorbent layer 31 has a width direction. The three first absorbers 31a are arranged so as to be spaced apart from each other (in the direction of X shown in FIGS. 1 to 3), and the second absorbent layers 33 are arranged spaced apart from each other in the width direction. Two second absorbers 33a and 2 Each of the second absorbers 33a is arranged so as to overlap both of the three first absorbers 31a, 31a, 31a, and each of the plurality of absorbers 30 is an intermediate liquid. It is arrange | positioned in the space partitioned off by the permeable sheet 32a.

  In such an absorbent article, since the plurality of absorbent bodies are respectively arranged in the spaces partitioned by the intermediate liquid-permeable sheet, the plurality of absorbent bodies positioned between the top sheet and the back sheet It is possible to prevent the superabsorbent polymer (SAP) from moving. Furthermore, since the plurality of absorbers constitute the above-described predetermined laminated structure, it is difficult for the excrement to be absorbed in the part where the absorbers in one layer are separated, and the excrement leaks. Can be suppressed.

[1-1] Top sheet:
The top sheet is a sheet that is at least partially made of a liquid-permeable material and is located on the skin side of the wearer when the diaper is worn.

  The top sheet has at least a part (all or one part) of the top sheet so that the absorbent body disposed on the back side absorbs excrement such as urine of the wearer (hereinafter sometimes simply referred to as “urine”). Part) is made of a liquid-permeable material. Usually, at least in the vicinity of the surface of the absorbent body, it is made of a liquid-permeable material that can transmit excrement such as urine and body fluid of the wearer. In addition, as long as at least one part is comprised with the liquid-permeable material, the whole top sheet does not necessarily need to be comprised with the liquid-permeable material.

  Examples of the liquid permeable material constituting the top sheet include a woven fabric, a nonwoven fabric, and a porous film. Among these, it is preferable to use a non-woven fabric made of a thermoplastic resin such as polypropylene, polyethylene, polyester, nylon (registered trademark) or the like and subjected to a hydrophilic treatment. There is no restriction | limiting in particular also about the kind of nonwoven fabric, The conventionally well-known nonwoven fabric manufactured by various manufacturing methods, such as air through (card hot air), card | curd embossing, and a spun bond, can be used suitably.

  The top sheet may be composed of a single sheet material, but may be composed of a plurality of sheet materials. For example, a top sheet having a configuration in which the sheets disposed on the portion covering the absorber and the portion other than the above (specifically, the side flap portion) are different is also used. For example, in the tape-type disposable diaper 100 shown in FIG. 1, a center sheet 18a made of a liquid-permeable material is disposed at the center in the short direction (width direction), and the liquid permeation is transmitted through the side flap 8 portion of the diaper. It is an example which shows the top sheet 18 comprised by arrange | positioning and arrange | positioning the side sheet | seat 18b which consists of ventilation water-repellent material which shows resistance with respect to this.

[1-2] Backsheet:
The back sheet is made of a liquid-impermeable material laminated on one surface side of the top sheet, and is a sheet positioned on the wearer's clothing side when the diaper is worn.

  In order to prevent the excrement of the wearer from leaking outside the diaper, the backsheet is made of a liquid-impermeable material as described above. And there is no restriction | limiting in particular about the arrangement | positioning method of a back sheet, For example, the structure which arrange | positions a back sheet | seat so that it may correspond with a top sheet | seat is employable. In addition, from the viewpoint of preventing leakage of urine absorbed by the absorber, it is preferable to dispose a back sheet of a liquid-impermeable material at least in a portion where the absorber exists. The tape-type disposable diaper 100 shown in FIG. 1 is an example that employs a configuration in which a back sheet 20 is disposed so as to match the outer shape thereof.

  Examples of the liquid-impermeable material constituting the back sheet include a liquid-impermeable film made of a resin such as polyethylene. Among these, it is preferable to use a microporous polyethylene film. This microporous polyethylene film has a large number of fine pores of 0.1 to several μm, and is liquid-impermeable but has moisture permeability, so it is possible to prevent stuffiness inside the absorbent article. There is an advantage.

  Note that a sheet material (cover sheet) may be bonded to the outer surface of the back sheet. This cover sheet can be used to reinforce the back sheet and to improve the touch (feel).

  Examples of the material constituting the cover sheet include woven fabric and non-woven fabric. Among these, it is preferable to use a dry nonwoven fabric and a wet nonwoven fabric made of a thermoplastic resin such as polyethylene, polypropylene, and polyester.

[1-3] Absorber:
A plurality of absorbers are disposed between the top sheet and the back sheet, and constitute a laminated structure including a first absorbent layer and a second absorbent layer disposed closer to the back sheet than the first absorbent layer. To do. And such an absorber is a member for absorbing and holding a wearer's urine. For example, FIG. 3 shows a plurality of absorbers 30 (FIG. 3) constituting a laminated structure including a first absorbent layer 31 and a second absorbent layer 33 disposed on the backsheet 20 side with respect to the first absorbent layer 31. It is an example which shows the tape-type disposable diaper 100 provided with 2). The plurality of absorbers having such a configuration can prevent the occurrence of kinks during use because the length in the width direction of each absorber is short. Moreover, since the length of the absorbent body in the width direction is short, even if the superabsorbent polymer (SAP) moves, the moving distance becomes short. Therefore, there is an advantage that the movement of the superabsorbent polymer is suppressed.

  There is no restriction | limiting in particular about the shape of an absorber, A strip | belt shape, an ellipse shape, a wave shape etc. can be mentioned. Moreover, the shape which the whole several absorber comprises is a shape currently used with absorbent articles, such as the conventional disposable diaper, Specifically, a rectangular shape, an hourglass type, a gourd type, a T-shape etc. Can do. The tape-type disposable diaper 100 shown in FIG. 1 shows an example in which a plurality of strip-shaped absorbent bodies 30 are used and the plurality of absorbent bodies 30 as a whole are hourglass shaped.

  Examples of the material constituting the absorber include fluff pulp, superabsorbent polymer (SAP), hydrophilic sheet and the like. As the fluff pulp, it is preferable to use wood pulp or non-wood pulp defibrated into cotton, and as SAP, it is preferable to use sodium polyacrylate. And as a hydrophilic sheet | seat, it is preferable to use the tissue, the absorbent paper, and the nonwoven fabric which performed the hydrophilic treatment.

  Although the material which comprises an absorber can select and use the said material suitably, it is preferable that the material which comprises a 2nd absorber contains SAP. SAP is rich in water absorption but requires time for water absorption. Therefore, it is preferable to arrange on the back sheet side rather than on the top sheet side. For example, in the tape-type disposable diaper 100 shown in FIG. 3, the second absorbent body 33a is constituted by the fluff pulp 45 and the superabsorbent polymer 46, and the first absorbent body 31a is used without using the superabsorbent polymer. The example comprised by the fluff pulp 45 is shown.

  When using fluff pulp and SAP as materials, the SAP content is preferably about 10 to 500 parts by mass with respect to 100 parts by mass of fluff pulp. In addition, SAP may be mixed uniformly in each mat | matte of fluff pulp, and may be arrange | positioned at the layer form between the layers of the multilayer fluff pulp.

[1-3-1] First absorption layer:
The first absorption layer has a plurality of first absorbers arranged to be spaced apart from each other in the width direction. According to such a structure, since the length of each absorber in the width direction is short, it is possible to prevent wrinkling that occurs during use. Moreover, since the length of the absorbent body in the width direction is short, even if the superabsorbent polymer (SAP) moves, the moving distance becomes short. Furthermore, when the absorbent article is folded along its longitudinal direction, it is easily folded in the region between the adjacent first absorbent bodies, and therefore, excessive force is applied to the absorbent body, resulting in damage. There is an advantage that can be prevented.

  The interval between the separated first absorbers, that is, the interval between adjacent first absorbers is not particularly limited, but is preferably 5 to 50 mm, and more preferably 10 to 30 mm, for example. When the interval is less than 5 mm, when the intermediate liquid permeable sheet and the back sheet (or the lower liquid permeable sheet) are bonded, it is difficult to sufficiently apply an adhesive or the like because the bonding region is too small. And there is a possibility that it cannot be sufficiently joined. On the other hand, if it exceeds 50 mm, the amount of excreta that can be absorbed cannot be secured, which may cause leakage.

  The number of the first absorber is not particularly limited as long as it is plural, but is preferably 2 to 5, for example, and more preferably 3 to 4. When the number of the first absorbers is less than 2, the absorbers are twisted. On the other hand, if the number exceeds 5, the width of each absorber is narrowed. Therefore, when the pulp mat is transferred from the forming drum to the lower liquid-permeable sheet, it may not be transferred well, and trouble may occur. May occur.

[1-3-2] Second absorption layer:
The second absorption layer has a plurality of second absorbers arranged to be spaced apart from each other in the width direction. According to such a structure, since the length of each absorber in the width direction is short, it is possible to prevent wrinkling that occurs during use. Moreover, since the length of the absorbent body in the width direction is short, even if the superabsorbent polymer (SAP) moves, the moving distance becomes short. In addition, when the absorbent article is bent along its longitudinal direction, it is easily bent in the region between the adjacent second absorbent bodies, so that excessive force is applied to the absorbent body, resulting in damage. There is an advantage that can be prevented.

  And each of a some 2nd absorber is arrange | positioned so that it may overlap with both the adjacent things among a some 1st absorber. When the second absorber is arranged as described above with respect to the first absorber, even if excrement flows into the region between the adjacent first absorbers, the adjacent first Since said 2nd absorber is arrange | positioned between absorbers, a 2nd absorber further absorbs excrement. Therefore, compared with the case of a single layer structure (only the case of a 1st absorption layer), the leakage of excrement can be suppressed. In the tape-type disposable diaper 100 shown in FIG. 2, each of the two second absorbent bodies 33a overlaps both adjacent ones of the three first absorbent bodies 31a in the thickness direction of the tape-type disposable diaper 100. An example of such arrangement is shown.

  As the interval between the adjacent second absorbers, the same interval as that of the first absorber described above can be adopted. Moreover, the shape similar to the 1st absorber mentioned above can be employ | adopted for the shape of a 2nd absorber.

  The number of second absorbers is not particularly limited as long as it is a plurality, but is preferably the same as the number of regions between adjacent first absorbers. That is, it is preferable that one second absorbent body is disposed so as to cover one of the regions between the adjacent first absorbent bodies.

[1-3-3] Intermediate liquid permeable sheet:
The intermediate liquid permeable sheet is disposed between the first absorbent layer and the second absorbent layer, and each of the plurality of absorbers is in a space partitioned by the intermediate liquid permeable sheet. Has been placed. And when the intermediate liquid permeable sheet is arranged as described above, excrement such as urine that could not be absorbed by the first absorption layer can be diffused, and the diffused excrement can be diffused by the second absorber. Since it can absorb, there is an advantage that the second absorber can be used effectively and the absorption rate of excreta is improved. Further, when each of the plurality of absorbers is partitioned by the intermediate liquid permeable sheet, the movement of the absorber is restricted as compared to the case where the absorber is not partitioned, so that the absorber can be prevented from being twisted. Movement can be suppressed.

  The material constituting the intermediate liquid-permeable sheet is not particularly limited as long as it is a liquid-permeable sheet, and examples thereof include woven cloth, non-woven cloth, porous plastic, and fluff pulp. Examples of these constituent materials include polypropylene, polyethylene, polyester, rayon, pulp, and composite fibers thereof. As the pulp, crimped fibers such as curly cellulose fibers can be suitably used.

  The intermediate liquid permeable sheet may be composed of one sheet that covers all of the plurality of second absorbers, or a plurality of sheets that cover each of the plurality of second absorbers. You may be comprised from this sheet | seat.

  If it is a single sheet that covers all of the plurality of second absorbent bodies, there is an advantage that the manufacture of the absorbent article becomes easy and the diffusibility of excrement such as urine is improved. FIG. 4 is an enlarged cross-sectional view corresponding to FIG. 2, and shows an example of a disposable diaper 101 including an intermediate liquid permeable sheet 32 b composed of a single sheet covering two second absorbent bodies 33 a. It is. In addition, the use of a plurality of sheets covering each of the plurality of second absorbers can reduce the amount of use of the sheet compared to the case of the single sheet, thereby reducing the manufacturing cost. Can be made. FIG. 3 is an example showing a tape-type disposable diaper 100 including an intermediate liquid-permeable sheet 32a composed of two sheets covering each of the two second absorbent bodies 33a.

  The intermediate liquid permeable sheet is preferably joined to the top sheet between the adjacent first absorbent bodies and is joined to the back sheet between the adjacent second absorbent bodies. And according to such a structure, the space which partitions off each of a some absorber can be formed easily.

  Furthermore, it is preferable that the intermediate liquid-permeable sheet is bonded to the back sheet on the outer sides of both side edges of the second absorbent layer. By joining in this way, when the pulp and SAP which comprise an absorber move, it can prevent that these leak out from the both-sides edge part of a 2nd absorption layer.

  Further, the intermediate liquid permeable sheet may be bonded to the top sheet outside the both side edges of the first absorbent layer. By joining in this way, when the pulp and SAP which comprise an absorber move, it can prevent that these leak out from the both-sides edge part of a 1st absorption layer.

  As a method for fixing the intermediate liquid permeable sheet to the top sheet and the back sheet, a conventionally known method can be adopted. For example, hot melt adhesives, other highly fluid adhesives, heat sealing such as heat sealing, and methods using welding by ultrasonic waves can be used. At this time, it is preferable to pressurize the intermediate liquid-permeable sheet from the top sheet side toward the back sheet side to fix the intermediate liquid-permeable sheet to the back sheet. When pressed and fixed in this manner, a first groove 38 is formed on the surface of the top sheet 18 as in the tape-type disposable diaper 100 shown in FIG. When the first groove is formed, when excrement such as urine is excreted, the excrement diffuses along the first groove, so that the absorption rate of the excrement is improved. is there.

[1-3-4] Lower liquid-permeable sheet:
The absorbent article of the present invention preferably further includes a lower liquid-permeable sheet between the second absorbent layer and the back sheet. By further providing this lower liquid-permeable sheet, excrement such as urine that has not been absorbed by the plurality of absorbers can be quickly diffused, and there is an advantage that the absorption rate is improved.

  As a material constituting the lower liquid permeable sheet, a material similar to the material constituting the intermediate liquid permeable sheet already described above can be used.

  The lower liquid-permeable sheet may be composed of a single sheet that covers all of the plurality of second absorbent bodies, like the above-described intermediate liquid-permeable sheet, You may be comprised from the several sheet | seat which coat | covers each of a 2nd absorber.

  When the lower liquid permeable sheet is used, the intermediate liquid permeable sheet described above is preferably joined to the lower liquid permeable sheet or the back sheet between the adjacent second absorbers. According to such a structure, the space which partitions off each of 2nd absorber can be formed easily.

  The tape-type disposable diaper 100 shown in FIG. 2 further includes a lower liquid-permeable sheet 34 between the second absorbent layer 33 and the back sheet 20, and the intermediate liquid-permeable sheet 32a is adjacent to the second liquid-permeable sheet 32a. In the first separation region 15 between the second absorbers 33a and 33a, the second absorbers 33a and 33a are joined to the lower liquid permeable sheet 34 and partitioned by the intermediate liquid permeable sheet 32a. An example is shown.

  Furthermore, it is preferable that the intermediate liquid permeable sheet is bonded to the lower liquid permeable sheet or the back sheet outside the both side edge portions of the second absorbent layer. By joining in this way, when SAP moves, it can prevent that it leaks out from the both-sides edge part of a 2nd absorption layer. For example, in the tape-type disposable diaper 100 shown in FIG. 2, the intermediate liquid permeable sheet 32 a is disposed in the region 49 outside the both side edges of the second absorbent layer 33 (see FIG. 3). An example of joining is shown.

  As a method for joining the middle liquid permeable sheet to the lower liquid permeable sheet or the back sheet, a conventionally known method can be exemplified, and the same method as the above-described method for joining the intermediate liquid permeable sheet to the back sheet. This method can be adopted.

  Note that the lower liquid-permeable sheet and the back sheet may be bonded to each other or may not be bonded.

[1-3-5] Upper liquid-permeable sheet:
It is preferable that the absorbent article of the present invention further includes an upper liquid permeable sheet between the first absorbent layer and the top sheet. By further providing this upper liquid-permeable sheet, excretion such as urine and body fluid that has permeated through the top sheet is diffused, and thus there is an advantage that the absorption rate is improved. In addition, even if the space on the back side of the top sheet is not sufficiently formed due to the posture of the wearer, etc., excretion is diffused, so excretion occurs due to the posture of the wearer, etc. It can suppress that the absorption rate of a thing falls. Therefore, it is possible to prevent the excrement from leaking due to the decrease in the absorption rate.

  As a material constituting the upper liquid permeable sheet, the same material as the material constituting the intermediate liquid permeable sheet described above can be used.

  The upper liquid permeable sheet may be composed of a single sheet that covers all of the plurality of first absorbent bodies, or covers each of the plurality of first absorbent bodies. It may be composed of a plurality of sheets.

  When the upper liquid permeable sheet is provided, the intermediate liquid permeable sheet is preferably joined to the upper liquid permeable sheet or the top sheet between the adjacent first absorbent bodies. According to such a structure, the space which partitions off each of the 1st absorber can be formed easily.

  The tape-type disposable diaper 100 shown in FIG. 2 further includes an upper liquid-permeable sheet 35 between the first absorbent layer 31 and the top sheet 18, and the intermediate liquid-permeable sheet 32a is adjacent to the first liquid-permeable sheet 32a. In the second separation region 16 between the absorbent bodies 31a and 31a, the first absorbent bodies 31a and 31a are each partitioned by the intermediate liquid permeable sheet 32a and bonded to the upper liquid permeable sheet 35. Show.

  Here, the intermediate liquid permeable sheet may be joined to the upper liquid permeable sheet on the outside of both side edges of the first absorbent layer. By joining in this way, when the pulp and SAP which comprise an absorber move, it can prevent that these leak out from the both-sides edge part of a 1st absorption layer.

  Examples of the method for joining the middle liquid permeable sheet to the upper liquid permeable sheet or the top sheet include conventionally known methods, for example, a method for joining the above-described intermediate liquid permeable sheet to the back sheet; A similar method can be employed. At this time, it is preferable to pressurize the top sheet from the top sheet side toward the back sheet side to join the upper liquid-permeable sheet to the top sheet. When pressed and fixed in this manner, a second groove 39 is formed on the surface of the top sheet 18 as in the tape-type disposable diaper 100 shown in FIG. When this second groove is formed, when excrement such as urine is excreted, this excrement diffuses along the second groove, so that the excretion absorption rate is improved. is there.

  Note that the upper liquid-permeable sheet and the top sheet may or may not be joined to each other.

[1-4] Fastening tape:
Among the absorbent articles of the present invention, the tape-type disposable diaper can further include a fastening tape that is a tape-like fastener for fixing the back body and the front body. The tape-type disposable diaper can be made into a pants-type whole diaper by fastening the fastening tape to the fastening area formed in the front body, and it is possible to attach the diaper to the wearer Become. Usually, this fastening tape is arrange | positioned so that it may extend from each side edge while being arrange | positioned at least one each on the left and right side edges of the back body of a diaper.

  The "front body" is the part that covers the wearer's belly side (front of the body) when the diaper is worn on the wearer, and the "inseam" is worn when the diaper is worn on the wearer. The “back body” is a part that covers the back side (back of the body) of the wearer when the diaper is worn on the wearer. In addition, the crotch part is shown with the code | symbol 4 in the tape-type disposable diaper 100 shown in FIG.

  A tape-type disposable diaper 100 shown in FIG. 1 includes two fastening tapes 50 arranged on the left and right side edges 6a and 6b of the back body 6, and the fastening tape 50 is made of a cloth base material 48. The fastener part 44 which consists of the hook 44a of a mechanical fastener is formed in the front-end | tip vicinity. On the other hand, the front body 2 is formed with a fastening region 12 formed of a loop 44b of a mechanical fastener, and is configured so that the hook 44a of the fastening tape 50 can be fixed. By such fastening tape 50 and fastening region 12, the back body 6 of the tape-type disposable diaper 100 can be fixed to the front body 2, and the tape-type disposable diaper 100 can be attached to the wearer. .

[1-5] Solid gather:
When the absorbent article of the present invention is used as a disposable diaper, a three-dimensional gather may be provided to prevent side leakage of urine excreted by the wearer. The three-dimensional gather is a member for preventing side leakage of the urine excreted by the wearer, and is a leak-proof wall configured to stand up three-dimensionally. By forming such a three-dimensional gather, the three-dimensional gather serves as a breakwater, and leakage from a leg-diameter opening or the like (so-called “lateral leakage”) can be effectively prevented.

  The structure used for the conventional disposable diaper can be employ | adopted for the structure of a three-dimensional gather. For example, a stretchable material (a three-dimensional gathered stretchable material) disposed on a part of the water-repellent sheet material and a sheet (gather) formed on the sheet material by the three-dimensional gathered stretchable material can be suitably used.

  The three-dimensional gather may be formed of a sheet material that is completely different from the top sheet and the back sheet, but may be formed by folding back a top sheet such as a center sheet or a side sheet.

  In order to prevent leakage from the crotch part, this three-dimensional gather may be formed at least in the crotch part, but may be formed in the front body or the back body. For example, the tape-type disposable diaper 100 shown in FIG. 1 has a pair of three-dimensional gathers 26 (26a, 26b) continuously from the crotch part 4 to both the front body 2 and the back body 6 along the longitudinal direction of the diaper. The example which is formed is shown. Note that at least one pair of solid gathers must be formed, but two or more pairs may be formed.

  The three-dimensional gather may be an inward gather that tilts toward the inside of the diaper, or an outward gather that tilts toward the outside of the diaper. Moreover, it can also be set as the three-dimensional gathers (C fold gather, Z fold gather, etc.) which formed the bending part and the folding | turning part in a part of height direction. For example, the tape-type disposable diaper 100 shown in FIG. 1 is an example in which the three-dimensional gather 26 (26a, 26b) is turned over and gathered as shown in FIG. The three-dimensional gathers 26 (26a, 26b) are arranged so as to sandwich one solid gathering elastic member 36 (36a, 36b).

[1-6] Various elastic materials:
When the absorbent article of the present invention is used as a disposable diaper, it is preferable to arrange an elastic material around the legs and an elastic material around the waist.

  The leg circumference elastic material is an elastic material arranged along the leg circumference opening. By arranging the leg-stretchable material, a gather (leg gather) rich in stretchability can be formed in the leg-surrounding opening. Therefore, it is difficult to form a gap around the leg, and urine leakage from the opening around the leg can be effectively prevented. Further, when the leg stretchable material is disposed, the leg stretchable material contracts on both sides of the absorbent body when changing the diaper, so that the vicinity of the crotch portion is deformed into a bowl shape and a recess is formed. For this reason, urine and body fluid accumulate in the concave portion, and the diaper can be easily replaced without spilling urine and body fluid.

  For example, the tape-type disposable diaper 100 shown in FIG. 1 is an example in which leg gathers are formed by arranging two leg-around elastic members 40 linearly along the longitudinal direction of the diaper. The leg-around elastic member 40 is made of rubber thread. In addition, it is not necessary to arrange | position the leg periphery elastic material linearly, for example, you may arrange | position in a curve along the curve of the leg periphery opening part of a diaper.

  The leg stretchable material is preferably formed with a leg stretchable material 40 in a portion outside the standing line 51 of the three-dimensional gather 26, for example, like a tape-type disposable diaper 100 shown in FIG. With such a configuration, it is possible to improve the wearing feeling and wearing feeling of the crotch part while ensuring a sufficient leakage preventing effect of the three-dimensional gather.

  The tape-type disposable diaper 100 shown in FIG. 1 shows an example in which the shape, arrangement position, number of arrangements, etc. of the leg elastic members 40 are symmetric, but the left and right leg elastic materials 40 are asymmetric. You may arrange in. And in the tape-type disposable diaper 100 shown in FIG. 1, although the example which has arrange | positioned two leg periphery elastic materials 40 per one side is shown, you may arrange | position only one per one side and arrange | position three or more per one side. May be. In addition, when a plurality of leg elastic members are used, their thickness, stretch rate, and the like can be appropriately set according to the purpose.

  Next, the waist elastic material is an elastic material disposed along the waist opening. By arranging the elastic material around the waist, a gather (waist gather) rich in elasticity can be formed in the waist opening. This waist gather makes it difficult for gaps to be formed around the waist, and urine leakage from around the waist can be prevented. Moreover, the fitting property of the diaper to a wearer becomes favorable and can prevent the diaper slipping down.

  The tape-type disposable diaper 100 shown in FIG. 1 is an example in which a belt-like waist elastic member 42 is disposed along the edge of the body 6 thereafter. The belt-shaped waist elastic member 42 can be formed of a stretchable foam such as urethane foam. In addition, you may arrange | position a waist circumference elastic material in both a back body (back side) and a front body (abdominal side).

  For these stretchable materials, the constituent material, the elongation rate of the material, the stretched state at the time of fixation, and the like can be determined in consideration of the degree of gather contraction and the like.

  As said elastic material, the elastic material currently used for absorbent articles, such as the conventional disposable diaper, can be used. Specific examples include thread rubber made of an elastic material such as natural rubber and synthetic rubber (urethane rubber, etc.), flat rubber, stretchable net, stretchable film, stretchable foam (urethane foam, etc.), and the like.

  The stretchable material is preferably fixed in an expanded state in order to exert a sufficient stretch force. For example, when the elastic material is natural rubber or synthetic rubber, it is preferably fixed in a stretched state of 120 to 400%, and more preferably fixed in a stretched state of 200 to 300%. By fixing in the extended state in such a range, a sufficient stretching force can be applied.

  Furthermore, the stretchable material can be fixed by an adhesive or other means. Examples of the fixing method include an adhesive method using a hot melt adhesive and other highly fluid adhesives, a heat sealing method including heat sealing, and a method using welding using ultrasonic waves.

  As described above, the absorbent article of the present invention can be used as a tape-type disposable diaper, but may be a pants-type disposable diaper. The tape-type disposable diaper and the pants-type disposable diaper include a one-piece type and a two-piece type, respectively. The absorbent article of the present invention can be applied to any type.

  Here, the “one-piece type” includes a top sheet, a back sheet, and an absorbent body, but an absorbent body that has an absorption / holding function is interposed (incorporated) between the top sheet and the back sheet, and is equipped with a function. Means a type of diaper configured integrally with a top sheet and / or a back sheet.

  In addition, “two-piece type” means an absorbent main body that functions to absorb and retain the excrement of the wearer (absorption / retention function), and a function that encapsulates the wearer's body (mounting function). This means a diaper that is composed of an exterior member and in which an absorbent main body is disposed inside the exterior member.

  The said absorptive main body is a member provided with an absorber, a top sheet, and a back sheet as a component, and manufactures by inserting an absorber between a top sheet and a back sheet, and sealing the peripheral part of an absorber. be able to. An absorptive main body is comprised by the size which covers at least the crotch part of a diaper. However, in order to ensure the effect of preventing leakage, it is preferable to have a size that covers not only the crotch part but also a part of the front body and the back body. The absorptive main body can be fixed to the exterior member using, for example, a hot melt adhesive.

  The exterior member is a member having a mounting function for encapsulating the wearer's body, and specifically, is a sheet-like member that forms the front body, the crotch portion, and the back body. The two-piece diaper absorbs and retains the excretion fluid of the wearer, and the absorption / retention function is exclusively performed by the absorbent main body. Therefore, the liquid-impermeable material is used as the material for the exterior member. There is no need to use. Examples of the material constituting the exterior member include a nonwoven fabric composed of synthetic fibers made of polyethylene, polypropylene, polyester, and other thermoplastic resins.

  In addition, when the absorbent article of the present invention is used as a urine pad, a sanitary napkin that absorbs menstrual blood, or a cage sheet that absorbs a cage, the above-described fastening tape or three-dimensional gather may not be provided. .

[2] Manufacturing method of absorbent article:
The manufacturing method of a tape-type disposable diaper is demonstrated below among the absorbent articles of this invention.

  First, a method for producing a first absorption layer having a plurality of first absorbers will be described. To manufacture the first absorbent layer, first, a first forming drum 60 as shown in FIG. 5 is prepared. The first forming drum 60 is hollow inside, and a recess 60b having an inverted shape of the first absorber is formed on the outer peripheral surface 60a. Through holes are formed at predetermined intervals on the bottom surface of the recess 60b. (Not shown) is formed. And the 1st ring 61 is arrange | positioned in the hollow 60b at predetermined intervals. The first ring 61 is a plate-like member in which no through hole is formed, and the first ring 61 can block the through hole formed in the recess 60 b of the first forming drum 60. The inside of the first forming drum 60 is maintained at a negative pressure.

  Next, a material for forming the first absorbent body (for example, fluff pulp) is supplied into the recess 60 b of the first forming drum 60. When the material is supplied to the first forming drum 60 in this way, the material is stacked on a portion of the recess 60b of the first forming drum 60 other than the portion where the first ring 61 is disposed. In this way, it is possible to obtain a first absorbent layer having a plurality of elongated absorbent bodies (first absorbent bodies) spaced apart from each other. Then, a predetermined | prescribed 1st absorption layer can be obtained by cut | disconnecting an elongate 1st absorption layer by a predetermined space | interval. As described above, a desired first absorption layer can be obtained by appropriately setting the shape and arrangement of the first ring 61.

  Next, the second absorption layer can be manufactured by a method similar to the method for manufacturing the first absorption layer. Specifically, as shown in FIG. 6, a second forming drum 62 is prepared in which recesses 62b having through holes (not shown) are formed at predetermined intervals on the outer peripheral surface 62a. Then, the second ring 63 is disposed in the recess 62 b of the second forming drum 62. Thereafter, materials (for example, fluff pulp and SAP) for constituting the second absorbent body are supplied into the recesses 62 b of the second forming drum 62 in the same manner as in the case of the first absorbent layer. In this way, a predetermined second absorbent layer can be obtained by obtaining a long second absorbent layer and cutting the obtained second absorbent layer at a predetermined interval.

  Next, a long sheet material (back sheet material) is prepared as a back sheet material, and a lower liquid absorbent sheet, a second absorbent layer, an intermediate liquid absorbent sheet, and a first absorbent are formed on the surface. While laminating the layer, the upper liquid absorbent sheet, and a long sheet material (top sheet material) as a material of the top sheet, the components are joined by applying pressure from the top sheet material side. At this time, the elastic material around the legs can be placed at a predetermined position. Thus, the laminated body (diaper continuous body) used as the intermediate body of a diaper is obtained. In addition, the top sheet material can use two types, a top sheet material corresponding to a center sheet and a top sheet material corresponding to a side sheet. A three-dimensional gather can be formed by providing a folded portion on the sheet material corresponding to the side sheet.

  Next, about the obtained diaper continuous body, the part corresponding to the leg periphery opening part of a diaper is cut out circularly, and it cuts out (R cut), and forms a leg periphery opening part. Thereafter, a tape-type disposable diaper can be manufactured by attaching a fastening tape and cutting the diaper continuous body at a predetermined interval.

  The absorbent article of the present invention is suitable as a diaper for infants or adults such as the elderly and persons with disabilities who need care, a sanitary napkin that absorbs menstrual blood, a sheet that absorbs cages, etc. Can be used for

2: front body, 4: crotch part, 6: back body, 6a, 6b: side edge, 8: side flap, 12: fastening region, 15: first separation region, 16: second separation region, 18: top Sheet, 18a: Center sheet, 18b: Side sheet, 20: Back sheet, 26, 26a, 26b: Solid gather, 30: Absorber, 31: First absorbent layer, 31a: First absorbent, 32a, 32b : Intermediate liquid permeable sheet, 33: Second absorbent layer, 33a: Second absorbent body, 34: Lower liquid permeable sheet, 35: Upper liquid permeable sheet, 36, 36a, 36b: Three-dimensional gather, 38 : First groove, 39: Second groove, 40: Elastic material around leg, 42: Elastic material around waist, 44: Fastener, 44a: Hook material, 44b: Loop material, 45: Fluff pulp, 46: High water absorption Polymer, 47: adhesive layer, 8: Substrate, 49: Outside region of both side edges, 50: Fastening tape, 51: Standing line, 60: First forming drum, 60a: Outer peripheral surface, 60b: Recess, 61: First ring, 62: second forming drum, 62a: outer peripheral surface, 62b: depression, 63: second ring, 100: tape-type disposable diaper.

Claims (6)

A top sheet at least partially made of a liquid-permeable material;
A backsheet made of a liquid-impermeable material laminated on one surface side of the topsheet;
A plurality of layers that are disposed between the top sheet and the back sheet, and constitute a laminated structure including a first absorbent layer and a second absorbent layer that is disposed closer to the back sheet than the first absorbent layer. An absorber,
An intermediate liquid permeable sheet disposed between the first absorbent layer and the second absorbent layer,
The first absorption layer has a plurality of first absorbers arranged in the width direction so as to be spaced apart from each other, and the second absorption layer is provided in a plurality of manners spaced from each other in the width direction. Each of the plurality of second absorbers is disposed so as to overlap both adjacent ones of the plurality of first absorbers,
Each of the plurality of absorbent bodies is an absorbent article disposed in a space partitioned by the intermediate liquid permeable sheet. Further comprising a lower liquid permeable sheet between the second absorbent layer and the back sheet,
When the intermediate liquid permeable sheet is joined to the lower liquid permeable sheet or the back sheet between the adjacent second absorbent bodies, the second absorbent bodies are mutually connected. The absorptive article according to claim 1 partitioned. Further comprising an upper liquid permeable sheet between the first absorbent layer and the top sheet,
The intermediate liquid permeable sheet is bonded to the upper liquid permeable sheet or the top sheet between the adjacent first absorbent bodies, whereby the first absorbent bodies are separated from each other. The absorbent article according to claim 1 or 2.   4. The absorbent article according to claim 2, wherein the intermediate liquid permeable sheet is joined to the lower liquid permeable sheet or the back sheet outside both side edges of the second absorbent layer. 5.   The intermediate liquid permeable sheet is bonded to the top sheet between the adjacent first absorbent bodies, and is bonded to the back sheet between the adjacent second absorbent bodies. The absorbent article according to claim 1, wherein the plurality of absorbers are partitioned from each other.   The absorbent article according to claim 5, wherein the intermediate liquid permeable sheet is bonded to the back sheet on the outer sides of both side edges of the second absorbent layer.

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