JP2010110485A - Absorbent sheet and absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thin and small absorbent sheet which keeps high absorbing capability by supporting a superabsorbent polymer in high density. <P>SOLUTION: The absorbent sheet 10 includes a highly absorbent body 30 having a pulp layer 13 containing a pulp 21 and a highly water absorbent layer 14 which is disposed on one surface side of the pulp layer 13 and contains the particulate superabsorbent polymer 22, a non-woven fabric sheet 11 which is disposed in a manner to cover a surface on the side of the highly water absorbent layer 14 of the highly absorbent body 30 and comprises a thermoplastic resin a part of which is subjected to hydrophilic processing, and a liquid permeable sheet 12 disposed to cover a surface on the side of the pulp layer 13 of the highly absorbent body 30. In the absorbent sheet 10, the non-woven fabric sheet 11 and the highly water absorbent layer 14 are thermally fused. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an absorbent sheet and an absorbent article. More specifically, the present invention relates to an absorbent sheet and an absorptive sheet that can be made thin and small while maintaining high absorption performance, in which a superabsorbent resin is supported at a high density. It relates to goods.

  Conventionally, as a superabsorbent sheet (absorbent sheet) for household use, industrial / agricultural use, civil engineering / building materials, etc., a superabsorbent polymer (hereinafter referred to as “SAP” in some cases) is used as a base material. Supported sheets are widely used. Such an absorbent sheet is desired to be thin and small in addition to having high absorption performance.

  For example, since disposable diapers and sanitary products are worn on the body, the absorbent sheets used for these tend to be thin and small. And as a thinner absorbent sheet having a high absorption performance, for example, a liquid absorber, a pulp-based surface material disposed on the one surface side, and the other surface side of the liquid absorber are disposed. A five-layer structure comprising a pulp-based back material, an SAP layer located between the liquid absorber and the surface material, and an SAP layer located between the liquid absorber and the back material (for example, Patent Document 1) Have been developed).

JP 2007-136162 A

  However, the sheet described in Patent Document 1 is thin and has high absorption performance. Recently, however, a thin absorption sheet having high absorption performance is desired. In order to meet this demand, that is, in order to further improve the absorption performance, it is conceivable to increase the amount of SAP adhering (supported amount). However, in the sheet described in Patent Document 1, even if the SAP is increased, the SAP is increased. However, it is difficult to sufficiently adhere to the surface material and / or the back material, and it is difficult to increase the amount of adhesion. Therefore, the development of an absorbent sheet that can carry a high water-absorbent resin at a high density and that can be made thin and small while maintaining high absorption performance and an absorbent article using the same has been desired.

  The present invention has been made in view of such problems of the prior art, and the superabsorbent resin is supported at a high density, and can be made thin and small while maintaining high absorption performance. An absorbent sheet and an absorbent article using the same are provided.

  According to the present invention, the following absorbent sheet and absorbent article are provided.

[1] A superabsorbent body having a pulp layer containing pulp and a superabsorbent layer including a particulate superabsorbent resin disposed on one surface side of the pulp layer, and the superabsorbent body A non-woven sheet made of a thermoplastic resin that is at least partially hydrophilized and disposed so as to cover the surface of the superabsorbent layer, and the pulp layer side of the superabsorbent body. A liquid permeable sheet arranged as described above, wherein the nonwoven sheet and the superabsorbent layer are heat-sealed.

[2] The absorbent sheet according to [1], which is obtained by heating a laminated body in which the nonwoven fabric sheet, the superabsorbent layer, the pulp layer, and the liquid-permeable sheet are laminated in this order.

[3] The absorbent sheet according to [1] or [2], wherein the pulp layer further includes at least one of heat-bonding fibers and heat-bonding powder.

[4] The absorbent sheet according to any one of [1] to [3], wherein the basis weight of the superabsorbent resin is 100 to 500 g / m ² .

[5] The absorbent sheet according to any one of [1] to [4], wherein the nonwoven fabric sheet is made of a thermoplastic resin containing polyethylene.

[6] The absorbent sheet according to any one of [1] to [5], wherein the nonwoven fabric sheet is an air-through nonwoven fabric.

[7] An absorbent article comprising the absorbent sheet according to any one of [1] to [6].

[8] The absorbent article according to [7], wherein the nonwoven sheet of the absorbent sheet is disposed so as to be positioned on a wearer side.

  The absorbent sheet of the present invention has a high water-absorbing resin carried at a high density, and has the effect of being thin and small while maintaining high absorption performance.

  The absorbent article of the present invention has a high water-absorbing resin supported at a high density, and has an absorbent sheet that can be made thin and small while maintaining high absorption performance, so there is little uncomfortable feeling when worn. This is an effect. In addition, since the product is thin and small, the logistics cost of the product can be reduced, the user can easily carry and carry the product, and the storage space for the product (absorbent article) can be reduced.

  Hereinafter, the best mode for carrying out the present invention will be described, but the present 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.

[1] Absorption sheet:
One embodiment of the absorbent sheet of the present invention is like the absorbent sheet 10 shown in FIG. 2, the pulp layer 13 including the pulp 21, and the particulate high-layer disposed on one surface side of the pulp layer 13. The superabsorbent body 30 having the superabsorbent layer 14 containing the superabsorbent resin 22 and the superabsorbent body are disposed so as to cover the surface of the superabsorbent layer 14 on the superabsorbent layer 14 side. A nonwoven fabric sheet 11 made of a thermoplastic resin, and a liquid-permeable sheet 12 arranged so as to cover the surface of the superabsorbent 30 on the pulp layer 13 side. The layer 14 is heat-sealed. Such an absorbent sheet has a high water-absorbing resin supported thereon at a high density, and can be thin and small while maintaining high absorption performance. In addition, FIG. 2 has shown the AA 'cross section of FIG. 1 which is a top view which shows the absorption sheet 10 which is one Embodiment of the absorption sheet of this invention.

[1-1] Superabsorbent:
As described above, the superabsorbent body has a pulp layer and a superabsorbent layer. The absorbent sheet of the present invention has a higher absorbent performance than the conventional absorbent sheet, because the superabsorbent layer is thick, that is, the superabsorbent resin is carried at a high density, and thus has a higher absorbent performance, for example, Even if it is thin, small and compact, high absorption performance can be maintained.

  The superabsorbent can be formed by pressure-bonding a laminate in which a pulp layer and a superabsorbent layer are laminated, for example, by feeding the laminate into a pressing roll. A plain roll, an embossing roll, etc. can be used as a press roll. When a pulp layer and a superabsorbent layer are pressure-bonded using a plain roll, there is an advantage that the pulp layer and the superabsorbent layer can be firmly crimped.

[1-1-1] Pulp layer:
The pulp layer contains pulp, and by having this pulp layer, liquid such as urine can be absorbed quickly. Although the thickness of a pulp layer can be set suitably, specifically, it is preferable that it is 0.05-2.0 mm, it is still more preferable that it is 0.1-1.5 mm, 0.2 -1.0 mm is particularly preferred.

  Examples of the pulp include wood pulp and non-wood pulp. Examples of wood pulp include softwood pulp and hardwood pulp. Examples of the non-wood pulp include hemp, cocoon, three cocoons, ganpi, rice straw, wheat straw, banana, bagasse, moon peach, kenaf, bamboo, cocoon, pigeon shoots, and gambling. Among these, softwood pulp is preferable from the viewpoint that it has excellent strength when layered and is easily available.

  In addition to pulp, the pulp layer can contain heat-bonding fibers, heat-bonding powder, superabsorbent resin, deodorant and the like. Among these, it is preferable to further include at least one of a heat fusion fiber and a heat fusion powder. In the case where at least one of the heat fusion fiber and the heat fusion powder is included, since the binding between the fibers of the pulp layer is strengthened through the heating step, it is difficult to lose shape when worn.

  The pulp layer can be formed by, for example, a method in which a pulp sheet is defibrated to obtain pulp, and the obtained pulp is dropped on a forming drum and laminated.

[1-1-2] Superabsorbent layer:
The superabsorbent layer contains particulate superabsorbent resin disposed on one side of the pulp layer. Here, in this specification, the superabsorbent polymer is a general term for resins having a performance capable of absorbing physiological saline (salt concentration of 0.9% by mass) 30 times or more of its own weight. .

  As long as the superabsorbent resin is a resin having the above properties, its chemical structure and the like are not particularly limited. For example, carboxymethyl cellulose, polyacrylic acid and its salts, crosslinked acrylate polymer, starch-acrylic Water-swellable polymers such as acid graft copolymer, hydrolyzate of starch-acrylonitrile graft copolymer, cross-linked polyoxyethylene, cross-linked carboxymethyl cellulose, polysulfonic acid compound, polyethylene oxide, polyacrylamide, etc. Examples thereof include resins having a hydrated gel forming ability such as polymers and copolymers of isobutylene and maleic acid.

  In addition to the above resin, the superabsorbent resin may be a natural resin or a resin obtained by a biological technique. That is, examples of the resin obtained by a biological technique include a superabsorbent resin that is a culture product from Alcaligenes Latus. Also, a biodegradable resin may be used. Examples of the highly water-absorbing resin having biodegradability include polyaspartic acid amino acid cross-linked products.

  The superabsorbent resin is in the form of particles and is preferably in the form of particles that can be easily mixed and dispersed uniformly. Here, the term “particulate” is a concept including various shapes such as a granular shape, a flake shape, a pellet shape, and a short needle shape in addition to a so-called particulate shape.

  The particle size of the superabsorbent resin is not particularly limited, and the particle size according to the absorption characteristics required for the absorbent sheet can be appropriately selected. The particle size distribution can also be selected as appropriate. In general, if the particle size is too small, there is a risk that the yield may be reduced when the absorbent sheet is formed, and the liquid permeability of the absorbent sheet may be reduced. On the other hand, if the particle size is too large, the specific surface area of the superabsorbent resin tends to be small, and the absorption rate tends to decrease.

  Specifically, the superabsorbent resin preferably has a number average particle size of 50 to 900 μm, more preferably 160 to 850 μm, and 180 to 500 μm. Particularly preferred.

Basis weight of the superabsorbent polymer is preferably 100 to 500 g / ^{m 2,} and still more preferably from 150 and 400 / ^{m 2.} If the basis weight is less than 100 g / m ² , the amount of the superabsorbent resin supported is not sufficient, and it may be difficult to obtain good absorption performance. On the other hand, if it exceeds 500 g / m ² , the amount of the superabsorbent resin supported becomes too large, and the absorbent sheet may be bulky.

  The superabsorbent layer may contain other materials in addition to the superabsorbent resin. As other materials, fibrous materials such as the above-described pulp, synthetic fibers, or mixtures thereof can be used. Examples of the synthetic fiber include polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, etc.), rayon, and the like.

[1-2] Nonwoven fabric sheet:
The nonwoven fabric sheet is made of a thermoplastic resin which is disposed so as to cover the surface of the superabsorbent body on the superabsorbent layer side and which is at least partially subjected to a hydrophilic treatment. When such a nonwoven fabric sheet is used, it can be heat-sealed with the superabsorbent layer, so that the superabsorbent resin can be carried at a high density.

  Here, the conventional absorbent sheet is manufactured by forming a laminate including a superabsorbent body and a tissue disposed on both sides of the superabsorbent body, then spraying the laminate and pressing it. ing. As described above, in the conventional absorbent sheet, the tissue is disposed on both sides of the superabsorbent body, but the adhesive force between the tissue and the superabsorbent body (particularly the superabsorbent resin) is extremely weak. There was a problem. Therefore, the tissue peeled off as soon as the absorbent sheet touched the liquid such as water. Since the superabsorbent layer thus loses its shape, it is difficult to carry the superabsorbent resin at a high density.

  The absorbent sheet of the present invention uses the above-mentioned nonwoven fabric sheet and heat-bonds the nonwoven fabric sheet and the highly water-absorbent layer so that the superabsorbent layer hardly loses its shape and supports the highly water-absorbent resin at a high density. be able to. Moreover, since the said effect is acquired even if it does not use a binder or a hot melt, there exists an advantage that manufacturing cost can be made low. Furthermore, since the nonwoven fabric sheet also serves as a diffusion layer, there is an advantage that the absorption rate is faster than when a tissue is used.

  Examples of the thermoplastic resin include polyethylene, polypropylene, polyester, polyethylene terephthalate, and aliphatic polyamide. Among these, polyethylene is preferable because it melts at a relatively low temperature and is easy to process. In addition, you may use these individually by 1 type or 2 or more types. When using 2 or more types, what contains polyethylene is preferable. That is, it is preferable that the nonwoven fabric sheet is made of a thermoplastic resin containing polyethylene. When polyethylene is contained, there is an advantage that polyethylene is easy to process because it melts at a relatively low temperature.

  Moreover, when using 2 or more types of resin, you may use a different kind of resin, respectively, and may use the core sheath fiber whose melting | fusing point (or softening point) of a sheath part is lower than a core part. When the core-sheath fiber is used, the combination of the core part and the sheath part can be appropriately selected, but the core part is preferably polyethylene terephthalate or polypropylene, and the sheath part is preferably polyethylene core-sheath fiber.

  Moreover, it is preferable that a nonwoven fabric sheet is an air through nonwoven fabric. Since such a nonwoven fabric has a lot of fluff on the surface, the touch is good. Therefore, an absorbent sheet using an air-through nonwoven fabric as the nonwoven fabric sheet can be suitably used as an absorbent body of a diaper, for example.

  Although the thickness of the nonwoven fabric sheet can be set as appropriate, specifically, it is preferably 0.1 to 3.0 mm, more preferably 0.2 to 2.0 mm, -1.0 mm is particularly preferred.

  As a method for forming the nonwoven fabric sheet, a conventionally known method can be adopted, and examples thereof include a dry method, a wet method, and a method in which these are combined.

[1-3] Liquid-permeable sheet:
The liquid permeable sheet is disposed so as to cover the surface of the super absorbent body on the pulp layer side. The liquid permeable sheet is not particularly limited as long as it is a liquid permeable sheet. For example, a sheet made of the above-described thermoplastic resin, tissue, absorbent paper, perforated film, or the like can be used. Among these, it is preferable to use a tissue that is inexpensive and has good processing suitability.

  The thickness of the liquid permeable sheet can be set as appropriate, but specifically, it is preferably 10 μm to 3.0 mm, more preferably 15 μm to 2.0 mm, and 20 μm to 1.0 mm. It is particularly preferred that

  A conventionally well-known method can be employ | adopted for the formation method of a liquid-permeable sheet. For example, in the case of a nonwoven fabric made of a thermoplastic resin, it can be formed by a dry method, a wet method, or a method in which these are combined.

[1-4] Thermal fusion:
As described above, the absorbent sheet of the present invention is one in which the nonwoven fabric sheet and the superabsorbent layer are heat-sealed. In this way, the non-woven sheet and the superabsorbent layer are thermally fused, in other words, the superabsorbent resin is supported at a high density by using the superabsorbent layer and the non-woven sheet that can be thermally fused. An absorbent sheet can be obtained.

  There is no restriction | limiting in particular in the method of heat-seal | bonding a nonwoven fabric sheet and a highly water absorbing layer, A conventionally well-known method is employable. For example, a heat seal, a hot air dryer, etc. can be mentioned.

  The absorbent sheet of the present invention can be produced, for example, as follows. First, a pulp layer is laminated on a liquid permeable sheet. Next, a particulate water-absorbing resin is sprayed on the pulp layer to form a water-absorbing layer on the pulp layer. Next, a nonwoven fabric sheet made of polyethylene resin is laminated on the superabsorbent layer. Thus, the laminated body laminated | stacked in order of the liquid-permeable sheet | seat, the pulp layer, the high water absorption layer, and the nonwoven fabric sheet is obtained. Next, an absorption sheet can be obtained by heating the obtained laminated body. In addition, it is preferable that the heating conditions of a laminated body are 3 to 30 second (more preferably 10 to 20 second) at 90-140 degreeC (more preferably 100-130 degreeC), for example. Further, the laminate may be heated and pressed.

[2] Absorbent article:
The absorbent article of the present invention comprises the absorbent sheet of the present invention. Such an absorbent article (diaper) has a high water-absorbing resin carried at a high density, and the high water-absorbing resin is carried at a high density so that it is thin and small while maintaining high absorption performance. Because it has an absorbent sheet that can be used, there is little discomfort when worn. Further, if the absorbent sheet is thin and small, there is an advantage that it is easy to handle for the caregiver. In addition, there is an advantage that the storage / transportation space is reduced and the amount thereof is small when discarded.

  Furthermore, conventionally, a processing machine for absorbent articles capable of absorbing a large amount of urine or the like requires a pulp crushing / dispersing device and a superabsorbent resin spraying device. However, by incorporating the absorbent sheet of the present invention, a sufficient amount of absorption can be secured, eliminating the need for SAP sprayers, pulp crushers, and pulp sprayers used in conventional absorbent article manufacturing apparatuses. Thus, the absorbent article manufacturing apparatus has a very inexpensive and simple structure. Moreover, since the operation speed and operability are improved, the operability is greatly improved.

  FIG. 3 is a plan view showing an embodiment of the absorbent article of the present invention, and FIG. 4 shows a B-B ′ cross section of FIG. 3. As shown in FIG. 4, an absorbent article 100 is composed of an absorbent sheet 10 that is an embodiment of the absorbent sheet of the present invention, and a part of the absorbent sheet 10 that covers one surface of the absorbent sheet 10. A top sheet 27, a back sheet 20 covering the other surface of the absorbent sheet 10, and a cover sheet 16 attached to the outer surface side of the back sheet 20 are provided.

[2-1] Absorption sheet:
The absorbent sheet may be arranged so that either the nonwoven sheet or the liquid-permeable sheet is located on the wearer side, but is preferably arranged so that the nonwoven sheet is located on the wearer side. Usually, when a high water-absorbing resin is carried at a high density, the absorbent sheet becomes hard and the wearing feeling tends to deteriorate. However, when the absorbent sheet is disposed as described above, the nonwoven fabric surface is disposed on the wearer side. It feels soft and feels soft. Further, when the absorbent sheet is arranged as described above, the superabsorbent layer is located on the wearer side in the superabsorbent body, so that even if the absorbed liquid is reversed, the amount thereof is small. Thus, when there is little reverse amount, there exists an advantage that the environment in an absorbent article can be kept favorable and it is hard to raise | generate a skin trouble.

  The absorbent sheet is interposed between the top sheet and the back sheet after being sandwiched between the top sheet and the back sheet as in the absorbent article 100 shown in FIG. It is preferable to be mounted. Thus, if it interposes between a top sheet and a back sheet, it can prevent that SAP leaks from an absorption sheet, and can give shape stability to an absorption sheet.

  Although there is no restriction | limiting in particular in the shape of an absorbent sheet, The shape used in the conventional absorbent article, for example, a rectangular shape, an hourglass type, a gourd type, a T shape etc. can be mentioned.

[2-2] Top sheet:
It is a sheet | seat arrange | positioned so that the upper surface (surface located in a wearer side at the time of mounting | wearing of a diaper) of an absorption sheet may be coat | covered. Since the top sheet needs to absorb the wearer's urine in the absorbent sheet disposed on the lower surface side thereof, at least a part (all or a part) of the top sheet is made of a liquid-permeable material. is there.

  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.

  The top sheet may be composed of a single sheet material, but may be composed of a plurality of sheet materials. For example, when a top sheet is composed of a plurality of sheet materials, a center sheet (symbol “18” in FIG. 3) made of a liquid permeable material is disposed at the center of the diaper, and the side flap portion of the diaper is water repellent. The form which arrange | positions the side sheet | seat which consists of material can be illustrated.

[2-3] Backsheet:
The back sheet 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 part, and the back body. The back sheet is disposed so as to cover the lower surface of the absorbent sheet (the surface positioned on the clothing side when the diaper is worn). The back sheet is made of a liquid-impermeable material and can prevent the wearer's urine from leaking outside the diaper.

  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 impervious but has moisture permeability, so that the inside of the diaper can be prevented from being steamed There is.

[2-4] Cover sheet:
The cover sheet is used to reinforce the back sheet and improve the touch (feel) of the back sheet.

  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 or a wet nonwoven fabric made of a thermoplastic resin such as polyethylene, polypropylene, or polyester.

[2-5] Solid gather:
A three-dimensional gather can be arrange | positioned at the absorbent article of this invention. 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 this three-dimensional gather, urine is excreted on the top sheet, and even if the urine diffuses along the top sheet, the three-dimensional gather becomes a breakwater. Therefore, it is possible to effectively prevent leakage (so-called “lateral leakage”) from the opening around the leg of the diaper.

  The structure used for the conventional absorbent article can be adopted as the structure of the three-dimensional gather. For example, it is possible to suitably use a material in which an elastic material (three-dimensional gather elastic material) is arranged on a part of a sheet material for three-dimensional gathers, and the above-mentioned sheet material is gathered by the three-dimensional gather elastic material. .

  As the sheet material for the three-dimensional gather, it is preferable to use a water-repellent material from the viewpoint of improving the leak-proof property of the three-dimensional gather. Non-woven fabrics such as spunbond and card embossing may be used as the water repellent material, but because of high water pressure resistance, SMS (spunbond / meltblown / spunbond), SMMS (spunbond / meltblown / meltblown / spun) It is preferable to use a non-woven fabric such as a bond.

  A three-dimensional gather can be formed by folding back a top sheet or a back sheet. Further, the three-dimensional gather can be formed by sticking a sheet material completely different from the top sheet, the back sheet, and the like.

  It is preferable that the three-dimensional gathers are formed on both sides of the absorbent sheet from the viewpoint of preventing side leakage of urine. In particular, it is preferably formed along both side edges of the absorbent sheet. When a three-dimensional gather is formed in this way, even when the urine that cannot be absorbed instantaneously is diffused along the top sheet surface when urine is excreted on the top sheet, the three-dimensional gather However, since it reliably functions as a breakwater, side leakage from the opening around the legs can be effectively prevented.

  The absorbent article 100 shown in FIG. 3 is an example in which the three-dimensional gather 26 is formed along both side edges of the absorbent sheet 10. Note that the absorbent article 100 shown in FIG. 3 is an example in which the three-dimensional gathers 26 are formed across the entire side edges of the absorbent sheet 10, but at least the crotch part of the diaper for the purpose of preventing side leakage of urine. It suffices if it is arranged in a portion corresponding to.

  In the disposable diaper, at least a pair of three-dimensional gathers are preferably formed, but two or more pairs may be formed.

[2-6] Various elastic materials:
In the absorbent article of the present invention, various elastic materials such as a leg elastic material and a waist elastic material can be arranged.

  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.

  The waist elastic material is an elastic material arranged 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, preventing urine leakage from around the waist, as well as improving the fit of the diaper against the wearer and preventing leakage from the back and stomach side of the diaper. Is prevented.

  The absorbent article 100 shown in FIG. 3 is an example in which a leg-surround stretchable material 40 is disposed at the periphery of the leg-surrounding opening, and a waist-surrounding stretchable material 42 is disposed in the vicinity of the waist-surrounding opening.

  As these stretchable materials, stretchable materials that have been used in conventional absorbent articles can be suitably used. Specific examples include elastic rubber, elastic film, elastic foam (urethane foam, etc.), etc. in addition to thread rubber and flat rubber made of elastic materials such as natural rubber and synthetic rubber (urethane rubber, etc.). . Then, after considering the degree of gather contraction, etc., the constituent material, the elongation rate of the material, the stretched state at the time of fixation, and the like can be set.

  In addition, although the absorbent article 100 shown in FIG. 3 has shown the tape-type disposable diaper, the absorbent article of this invention may be a pants-type disposable diaper and a urine collecting pad. A pants-type disposable diaper is a diaper that is formed in a pants shape in advance by forming a waist opening and a pair of leg openings by joining corresponding side edges of the front and back bodies together. That is.

[2-7] Method for producing absorbent article:
A method for producing the absorbent article of the present invention will be described with reference to an example of producing the absorbent article 100 shown in FIG. The absorbent article 100 is a one-piece type tape diaper.

  First, the absorbent sheet 10 and the leg elastic member 40 are arranged on the upper surface of the back sheet 20, and the top sheet 27 is further arranged on the upper surface. As the top sheet 27, two types of the center sheet 18 and the side sheet 15 are used. Next, the one-side end portion of the side sheet 15 is folded, and the three-dimensional gathers 26 are formed by bonding the folded portions with the two three-dimensional gather elastic members 36 sandwiched therebetween. In this way, the absorbent main body 50 is formed. Next, the absorbent sheet 100 is manufactured by attaching the cover sheet 16 to which the four fastening tapes 25 are previously attached to the surface of the absorbent main body 50 on the back sheet 20 side.

  Such a series of steps can be continuously performed by mechanical means. Specifically, the absorbent article can be continuously manufactured by adopting a method / apparatus such as continuously feeding a long sheet material or stretchable material from a roller.

  The absorbent sheet of the present invention can be used as a superabsorbent sheet for household use, industrial / agricultural use, civil engineering / building materials, etc., and particularly preferably used as a superabsorbent sheet for disposable diapers and sanitary products. it can. In addition, the absorbent article of the present invention can be suitably used as an absorbent article for infants or for adults such as elderly people and persons with disabilities who need care.

It is a top view which shows one Embodiment of the absorption sheet of this invention. It is sectional drawing which shows the A-A 'cross section of FIG. It is a top view which shows one Embodiment of the absorbent article of this invention. It is sectional drawing which shows the B-B 'cross section of FIG.

Explanation of symbols

10: Absorbent sheet, 11: Non-woven sheet, 12: Liquid permeable sheet, 13: Pulp layer, 14: Super absorbent layer, 15: Side sheet, 16: Cover sheet, 18: Center sheet, 20: Back sheet, 21 : Pulp, 22: Superabsorbent resin, 25: Fastening tape, 26: Solid gather, 27: Top sheet, 30: Super absorbent, 36: Solid gather stretchable material, 40: Stretch material around leg, 42: Waist Surrounding elastic material, 50: Absorbent body, 100: Absorbent article.

Claims (8)

A superabsorbent body having a superabsorbent layer containing a particulate superabsorbent resin, which is disposed on one side of the pulp layer, and a pulp layer containing pulp;
A non-woven sheet made of a thermoplastic resin, at least part of which is disposed so as to cover the surface of the superabsorbent body on the superabsorbent layer side;
A liquid-permeable sheet disposed so as to cover the surface of the superabsorbent body on the pulp layer side,
An absorbent sheet in which the nonwoven fabric sheet and the superabsorbent layer are heat-sealed.   The absorbent sheet according to claim 1, wherein the absorbent sheet is obtained by heating a laminated body in which the nonwoven fabric sheet, the superabsorbent layer, the pulp layer, and the liquid-permeable sheet are laminated in this order.   The absorbent sheet according to claim 1, wherein the pulp layer further includes at least one of a heat fusion fiber and a heat fusion powder. The high basis weight of the water-absorbent resin, the absorption sheet according to claim 1 which is 100 to 500 g / ^{m 2.}   The said nonwoven fabric sheet consists of a thermoplastic resin containing polyethylene, The absorption sheet as described in any one of Claims 1-4.   The said nonwoven fabric sheet is an air through nonwoven fabric, The absorption sheet as described in any one of Claims 1-5.   An absorbent article provided with the absorption sheet as described in any one of Claims 1-6.   The absorptive article according to claim 7 arranged so that said nonwoven fabric sheet of said absorption sheet may be located in a wearer side.

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