WO2006001456A1 - 吸収体の製造設備、吸収体および吸収性物品 - Google Patents
吸収体の製造設備、吸収体および吸収性物品 Download PDFInfo
- Publication number
- WO2006001456A1 WO2006001456A1 PCT/JP2005/011861 JP2005011861W WO2006001456A1 WO 2006001456 A1 WO2006001456 A1 WO 2006001456A1 JP 2005011861 W JP2005011861 W JP 2005011861W WO 2006001456 A1 WO2006001456 A1 WO 2006001456A1
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- WO
- WIPO (PCT)
- Prior art keywords
- fiber assembly
- superabsorbent polymer
- sheet
- fiber
- absorbent body
- Prior art date
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
- A61F13/537—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/12—Surface bonding means and/or assembly means with cutting, punching, piercing, severing or tearing
- Y10T156/1317—Means feeding plural workpieces to be joined
- Y10T156/1343—Cutting indefinite length web after assembly with discrete article
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/17—Surface bonding means and/or assemblymeans with work feeding or handling means
- Y10T156/1798—Surface bonding means and/or assemblymeans with work feeding or handling means with liquid adhesive or adhesive activator applying means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/23—Sheet including cover or casing
- Y10T428/233—Foamed or expanded material encased
Definitions
- the present invention relates to an absorbent article such as a disposable diaper or a sanitary napkin, an absorbent body used for the absorbent article, and a manufacturing facility for the absorbent body.
- an absorbent body used for a body fluid absorbent article is formed by stacking short pulp fibers and superabsorbent polymer particles on a stacking drum, and then packaging them with an absorbent sheet such as crepe paper. It was. On the other hand, in recent years, it has been proposed to use a tow (fiber bundle) made of fibers for an absorbent body instead of a short fiber stack (see, for example, JP 2001-524399 A).
- FIG. 29 shows a structure of an absorber 120 using a conventional tow.
- a superabsorbent polymer 122 is sprayed on a band-like tow 125, and then wrapped with a sheet 123 coated with a bead of an adhesive 124.
- the applicant of the present invention sequentially arranges a fiber assembly composed of continuous tow fibers on a continuous belt-like sheet, If necessary, superabsorbent polymer particles are sprinkled on the fiber assembly, and then the belt-like sheet is folded to wrap the fiber assembly containing the superabsorbent polymer, and then in the MD direction (line flow direction).
- a fiber assembly composed of continuous tow fibers on a continuous belt-like sheet
- superabsorbent polymer particles are sprinkled on the fiber assembly, and then the belt-like sheet is folded to wrap the fiber assembly containing the superabsorbent polymer, and then in the MD direction (line flow direction).
- the manufactured absorbent body has most of the superabsorbent polymer not held by the tow or the sheet and can move freely, and it has a crisp feel and has absorption characteristics such as absorption amount. Unintentional !, biased, t, with other problems.
- Patent Document 1 JP 2001-524399 Gazette
- a main problem of the present invention is to solve the above problems.
- a first invention is an absorbent body having a fiber assembly formed by opening a tow, a superabsorbent polymer, and a sheet that wraps them.
- An adhesive is applied to the entire surface or substantially the entire surface of the sheet where at least the superabsorbent polymer is provided, and the superabsorbent polymer is adhered to the sheet by this adhesive. It is a characteristic absorber.
- a second invention is an absorbent body having a fiber assembly formed by opening a tow, a superabsorbent polymer, and a sheet that wraps them.
- At least the entire surface or almost the entire surface of the sheet on which the superabsorbent polymer is provided is provided with an adhesive-coated portion and a plurality of adhesive-free portions surrounded by the adhesive-coated portion.
- the absorbent body is characterized by having a superabsorbent polymer adhered to the sheet by the part where the adhesive is applied and a superabsorbent polymer existing in the part without the adhesive. .
- the superabsorbent polymer is surrounded by the adhesive force to the sheet or the adhesive-applied portion, so that the superabsorbent polymer is difficult to move and has a jerky feel. Unintentional bias of feeling and absorption characteristics can be effectively prevented.
- the height bonded to the fiber assembly is It has an absorptive polymer.
- the superabsorbent polymer is adhered to the fiber assembly, it is possible to more effectively prevent a harsh feel and an unintentional bias in the absorption characteristics. .
- a fourth invention is an absorbent body comprising a fiber assembly formed by opening a tow, a superabsorbent polymer, and a sheet surrounding them.
- the absorbent body is characterized in that the amount of the superabsorbent polymer in the first portion of the fiber assembly is greater than the amount of the superabsorbent polymer in the second portion of the fiber assembly.
- the first portion is a middle portion in the width direction of the fiber assembly, and the second portion is both side portions in the width direction of the fiber assembly.
- the amount of superabsorbent polymer in the widthwise intermediate portion of the fiber assembly is larger than the amount of superabsorbent polymer on both sides in the widthwise direction of the fiber assembly. In this case, it is possible to secure a large amount of absorption in a portion where more liquid is supplied.
- the first part is a part in the longitudinal direction of the fiber assembly
- the second part is another part in the longitudinal direction of the fiber assembly.
- the amount of the superabsorbent polymer in one part in the longitudinal direction is larger than the amount of the superabsorbent polymer in the other part, and the absorbent properties of the absorbent body in the longitudinal direction.
- the superabsorbent polymer is not substantially contained at both ends in the longitudinal direction.
- An eighth invention is an absorbent body comprising a fiber assembly formed by opening a tow, a superabsorbent polymer, and a sheet that wraps them.
- the absorbent body is characterized in that the density of the superabsorbent polymer in the first part of the fiber assembly is higher than the density of the superabsorbent polymer in the second part of the fiber assembly.
- the density of the superabsorbent polymer in the fiber assembly is relatively high, and there are few and few! /, Thereby providing the intended bias in the absorption characteristics such as the absorption speed of the absorber. be able to.
- the first portion is a middle portion in the width direction of the fiber assembly, and the second portion is both side portions in the width direction of the fiber assembly.
- the absorption rate at the intermediate portion in the width direction is slow, and the absorption rate at both side portions is high, and the absorption characteristic is fast. Therefore, when used in absorbent articles, the diffusivity around the partial force to which more liquid is supplied becomes better, so that a larger area can be used for absorption, and the absorption rate at both sides is increased. Since it is fast, so-called side leakage is prevented.
- the first portion is a longitudinal intermediate portion of the fiber assembly
- the second portion is a front portion and a rear portion of the longitudinal intermediate portion of the fiber assembly. Is.
- the absorption rate of the intermediate portion in the longitudinal direction is slow, and the absorption rate is high in the front portion and the rear portion of the intermediate portion in the longitudinal direction. Therefore, when used in absorbent articles, the diffusivity around the partial force to which more liquid is supplied becomes better, so a wider area can be used for absorption.
- An eleventh invention is an absorbent body comprising a fiber assembly formed by opening a tow, a superabsorbent polymer, and a sheet that wraps them.
- the fiber density in the first part of the fiber assembly is It is an absorbent body characterized by being higher than the fiber density.
- the fiber assembly formed by opening the tow has the property of diffusing liquid along the continuous direction of the fiber, and this tendency becomes more prominent as the density increases. Therefore, the intended bias can be given to the absorption characteristics of the absorbent body by providing the fiber assembly with relatively high and low fiber density portions.
- the first portion is a middle portion in the width direction of the fiber assembly, and the second portion is both side portions in the width direction of the fiber assembly.
- the diffusibility of the body fluid in the intermediate portion in the width direction of the fiber assembly is higher than the diffusibility of the body fluid in both side portions in the width direction. Therefore, when used in a body fluid absorbent article, more body fluid is used. The body fluid is easily diffused at the widthwise intermediate portion where the water is supplied, and a wider area can be used for absorption. Also, body fluid is difficult to diffuse at both sides of the width direction, so that so-called side leakage is effectively prevented. Is done.
- a thirteenth invention is an absorbent body having a fiber assembly formed by opening a tow and a superabsorbent polymer
- the absorbent body is characterized in that the superabsorbent polymer is dispersed inside the fiber assembly and adhered to the fiber via an adhesive.
- the superabsorbent polymer is dispersed inside the fiber assembly and is adhered to the fiber via an adhesive, the superabsorbent polymer is simply used as the fiber assembly. More superabsorbent polymers can be reliably fixed in the fiber assembly compared to conventional methods that are only sprayed onto the fiber assembly. Therefore, the crisp feel is reduced. In addition, unintentional biases in the absorption characteristics such as the absorption amount are less likely to occur. In other words, the absorption characteristics can be made in an intended form, for example, uniform or non-uniform.
- the fiber aggregate has a fiber basis weight of 30 to 90 g / m 2
- the superabsorbent polymer has a particle number of 20 to 850 ⁇ m in total number of particles. 90% or more of the particulate superabsorbent polymer, and the superabsorbent polymer
- the basis weight is 400 gZm 2 or less
- the basis weight of the adhesive to the fiber assembly is lgZ m 2 or more.
- a fifteenth aspect of the invention is an absorbent article comprising the absorbent body according to the first to fourteenth aspects of the invention.
- a polymer applying means for applying a superabsorbent polymer to an outer surface of a fiber assembly formed by opening a tow.
- a polymer moving means for allowing a gas to pass through the fiber assembly to which the superabsorbent polymer has been applied, and moving the superabsorbent polymer into the fiber assembly by the passing force of the gas;
- the superabsorbent polymer can be moved into the fiber assembly by utilizing the gas passing force, and therefore, more superabsorbent than the conventional method in which the polymer is simply sprayed.
- the conductive polymer is well retained in the fiber assembly. Therefore, a crisp feel can be reduced.
- unintentional biases in the absorption characteristics such as the amount of absorption hardly occur.
- the absorption characteristics can be made in an intended form, for example, uniform or non-uniform.
- the polymer moving means performs suction from the side opposite to the surface covered with the sheet in the fiber assembly.
- the superabsorbent polymer is added to the fiber assembly before the superabsorbent polymer is applied or after the superabsorbent polymer is applied.
- a means for supplying an adhesive to the fiber assembly before being moved to is provided.
- the superabsorbent polymer can be adhered to the fiber assembly, and it is possible to more effectively prevent a crisp feel and an unintentional bias in the absorption characteristics.
- the absorption characteristics can be in the intended form, for example uniform or non-uniform.
- the superabsorbent polymer is conveyed while being adhered to the tow, so that the polymer can be prevented from dropping off, scattering, or equipment failure due to this.
- a fiber opening means for opening the tow with compressed air to form a fiber assembly, and a shielding means for blocking the air directed toward the adhesive supply means. It is equipped with.
- a twentieth invention in the seventeenth invention, there is provided means for supplying an adhesive to a surface of the sheet on the fiber assembly side before covering the sheet.
- the superabsorbent polymer can be adhered to the sheet, and an unintentional bias in the crisp feel and absorption characteristics can be further effectively prevented.
- the tow meanders and enters the width (the width in the middle in the longitudinal direction is relatively narrow due to the conveying tension). May cause the adhesive to adhere to the equipment. Therefore, in order to prevent the adhesive from adhering to the equipment and various problems arising from it, it is preferable not to apply the adhesive to the sheet!
- any one of the sixteenth to twenty-first inventions there is provided means for supplying an adhesive to the fiber assembly after the superabsorbent polymer is moved into the fiber assembly. .
- the superabsorbent polymer can be adhered to the fiber assembly in a state of being moved as desired by suction. Therefore, it is possible to more effectively prevent a crisp feel and unintentional bias in the absorption characteristics.
- the polymer applying means is configured so that the amount of the superabsorbent polymer in the first portion of the fiber assembly is equal to that in the second portion of the fiber assembly.
- the superabsorbent polymer is added so as to be larger than the amount of the superabsorbent polymer.
- the first portion is a middle portion in the width direction of the fiber assembly, and the second portion is both side portions in the width direction of the fiber assembly.
- the amount of superabsorbent polymer in the intermediate portion in the width direction of the fiber assembly is such that the amount of superabsorbent polymer is larger than the amount of superabsorbent polymer on both sides in the width direction of the fiber assembly. A part where more liquid is supplied when used in absorbent articles. A large amount of absorption can be secured.
- the first portion is a longitudinal intermediate portion of the fiber assembly
- the second portion is a front portion and a rear portion of the longitudinal intermediate portion of the fiber assembly. Is.
- the amount of the superabsorbent polymer in the longitudinal intermediate portion of the fiber assembly is larger than the amount of the superabsorbent polymer in the front portion and the rear portion of the longitudinal intermediate portion of the fiber assembly. Further, by applying a superabsorbent polymer, when used in an absorbent article, it is possible to secure a large amount of absorption in a portion where more liquid is supplied.
- the polymer moving means causes the gas passage force to be greater than the second part of the fiber assembly relative to the first part of the fiber assembly. Strong or long acting.
- the first portion is a middle portion in the width direction of the fiber assembly, and the second portion is both side portions in the width direction of the fiber assembly.
- the gas passage force is applied to the intermediate portion in the width direction of the fiber assembly to be stronger or longer than both sides in the width direction of the fiber assembly, in the intermediate portion in the width direction of the fiber assembly.
- the amount of movement of the superabsorbent polymer is larger than that on both sides in the width direction.
- the density of the superabsorbent polymer in the middle portion in the width direction of the fiber assembly is higher on both sides in the width direction of the fiber assembly. It becomes higher than the density of the absorbent polymer.
- the absorption characteristics are fast, and the rapid absorption speeds at both sides in the width direction are low, while the absorption speed at the intermediate part in the width direction is slow.
- a twenty-eighth aspect of the invention is directed to any one of the sixteenth to the twenty-seventh aspects, further comprising means for increasing the fiber density in the first portion of the fiber assembly to be higher than the fiber density in the second portion of the fiber assembly. It is a thing.
- the fiber assembly formed by opening the tow has a property of diffusing liquid along the continuous direction of the fiber, and this tendency becomes more prominent as the density increases. Therefore, by providing the fiber assembly with a high fiber density portion and a low fiber density portion, a bias intended for the absorption characteristics of the absorber can be provided.
- the first portion is an intermediate portion in the width direction of the fiber assembly, and the second portion is both side portions in the width direction of the fiber assembly.
- the diffusive force of body fluid in the intermediate portion in the width direction is increased by making the fiber density in the intermediate portion in the width direction of the fiber assembly higher than the fiber density in the both sides in the width direction of the fiber assembly. Therefore, when used in a body fluid-absorbing article, body fluid is more likely to diffuse in the intermediate portion in the width direction where more body fluid is supplied, so that a larger area can be used for absorption. At the same time, since both sides in the width direction are difficult to diffuse, so-called side leakage is effectively prevented.
- a transport line for transporting a fiber assembly formed by opening a tow, and a superabsorbent polymer while periodically changing the amount of the fiber assembly on the transport line.
- a polymer applying means for applying is provided.
- the fiber assembly with a polymer applying means for applying the superabsorbent polymer while periodically changing the applied amount, the absorption characteristics can be changed in the transport direction, or the superabsorbent polymer can be changed. A portion having or may not be provided.
- the superabsorbent polymer is not moved by the passage of gas to the fiber aggregate to which the superabsorbent polymer is imparted by the polymer imparting means.
- an absorbent body having a structure in which most of the superabsorbent polymer is located outside the fiber assembly, that is, a layered structure having a layer having a superabsorbent polymer strength and a layer having a fiber aggregate strength.
- Such an absorbent has the advantage that the absorption speed is increased when it is used so as to absorb from the layer side of the fiber assembly.
- the polymer applying means intermittently applies the superabsorbent polymer in the transport direction, and applies the superabsorbent polymer to the portion to which the superabsorbent polymer is applied.
- the polymer applying means intermittently applies the superabsorbent polymer in the transport direction, and applies the superabsorbent polymer to the portion to which the superabsorbent polymer is applied.
- a cutter device is provided that cuts into individual absorbers at portions.
- the present inventors diligently studied on the point that the life of the cutter blade described above is shortened, and it was found that the cause is that the hardness of a commonly used superabsorbent polymer is unexpectedly high. did.
- the invention described in this section has been made on the basis of such knowledge.
- the superabsorbent polymer is provided by intermittent application of the superabsorbent polymer, and by providing the superabsorbent polymer, and cutting the portion. This makes it possible to cut the part where there is almost no existence, so that it is intended to avoid shortening the life of the cutter blade.
- the portion not provided with the superabsorbent polymer means a portion where the basis weight of the superabsorbent polymer is less than 0. OlgZcm 2 .
- FIG 1 shows an example of a pants-type disposable diaper.
- the pants-type disposable diaper 10 includes an outer surface (back surface) side exterior sheet 12 and an inner surface (front surface) side absorbent body 20, and the absorbent body 20 is fixed to the exterior sheet 12.
- the absorbent main body 20 is a portion that receives and absorbs and retains body fluids such as urine and loose stool (menstrual blood in a sanitary napkin described later).
- the exterior sheet 12 is a part for attaching to the wearer.
- the exterior sheet 12 has, for example, an hourglass shape as shown in the figure, and both sides are constricted, and this is a part into which the wearer's leg is inserted.
- the absorbent body 20 can take any shape, but is rectangular in the illustrated form.
- the exterior sheet 12 is folded back and forth after the absorbent main body 20 is installed and fixed in a predetermined position, and both sides of the front body 12F and the back body 12B of the exterior sheet 12
- the joining region 12A is joined by heat fusion or the like.
- An intermediate width in the longitudinal direction of the absorbent main body 20 shown in the drawing (that is, the vertical direction in Fig. 2 and also in the longitudinal direction of the product) is shorter than the width connecting the constricted portions of the exterior sheet 12. ing. This width relationship may be reversed or the same width.
- the exterior sheet 12 is preferably composed of two sheets of water-repellent nonwoven fabric, for example, and an elastic elastic member is interposed between these sheets, and a form that fits the wearer by the contraction force is desirable.
- this elastic elastic member thread rubber or elastic foam band can be used, but it is desirable to use a large number of thread rubbers.
- the rubber threads 12C, 12C,... are continuously provided in the width direction in the waist region W, provided only on both sides in the waist region U, and provided in the crotch region L. Absent.
- the rubber thread 1 2C, 12C ... is provided in both the waist region W and the lower waist region U, so that even if the elastic force of the thread rubber 12C itself is weak, the wearer also in the lower waist region U as a whole The product fits the wearer well.
- the absorbent main body 20 transmits, for example, body fluid.
- a top sheet 30 having strength such as a nonwoven fabric, an intermediate sheet (second sheet) 40, and an absorbent body 50 including an absorbent core 56 are provided.
- a body fluid impermeable sheet (also referred to as a back sheet) 70 that has a force such as a plastic sheet is provided on the back side of the absorbent body 50.
- An exterior sheet 12 is provided on the back side of the body fluid impermeable sheet 70.
- Norriya cuffs 60, 60 are provided on both sides.
- the top sheet 30 has a property of permeating body fluid. Therefore, the material of the top sheet 30 is sufficient if it exhibits this body fluid permeability, and examples thereof include a porous or non-porous nonwoven fabric and a porous plastic sheet.
- the nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as polyethylene and polypropylene, synthetic fibers such as polyester and polyamide, regenerated fibers such as rayon and cuvula, natural fibers such as cotton, and mixed fibers using two or more of them. Etc. can be illustrated. Further, the non-woven fabric may be manufactured by any kind of cage.
- processing methods include known methods such as the spunlace method, the spunbond method, the thermal bond method, the melt blown method, and the needle punch method.
- spunlace method is a preferable processing method for obtaining flexibility and drapeability
- thermal bond method is a preferable processing method for determining bulkiness and softness.
- the top sheet 30 may be a single sheet or a laminated sheet obtained by laminating two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the plane direction.
- an intermediate sheet 40 that is generally referred to as a “second sheet” that has a higher body fluid permeation rate than the top sheet 30 can be provided.
- This intermediate sheet quickly transfers body fluid to the absorbent body to enhance the absorption performance of the absorbent body, preventing the “returning” phenomenon of the absorbed body fluid absorbed by the force from the absorbent body. It can always be in a dry state.
- the intermediate sheet (second sheet) 40 is interposed between the top sheet 30 and the covering sheet 58. As shown in FIG. 20, a configuration without an intermediate sheet (second sheet) 40 can also be used.
- the intermediate sheet 40 in the form shown in the figure may be provided over the entire width of the force arranged in the center shorter than the width of the absorbent core 56.
- the length of the intermediate sheet 40 in the longitudinal direction may be the same as the length of the absorbent core 56, or may be within a short length range centered on the region that receives the body fluid.
- a typical material for the intermediate sheet 40 is a non-woven fabric having excellent body fluid permeability.
- Examples of the intermediate sheet 40 include the same material as the top sheet 30, spun lace, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper.
- an air-through nonwoven fabric and a spunbond nonwoven fabric are preferable.
- the strength of the intermediate sheet in the longitudinal direction of the product is 0.05-5.75g 'cm 2 Zcm.
- the surface side force of the product It is suitable for reducing or not causing a crisp discomfort when touching. is there.
- the “elasticity in the longitudinal direction of the product” means that the sample cut into a length of 200 mm and a width of 200 mm is measured with a pure bending tester (“KES-FB2” manufactured by Kato Tech Co., Ltd.) with a DFE sensitivity of 20, a curvature range of 0 Ocm _1 ⁇ 0.5cm—means the value obtained when bending in the range of 1 .
- KS-FB2 pure bending tester
- the absorbent body 50 includes an absorbent core 56 having a fiber assembly obtained by opening a tow and superabsorbent polymer particles, and a covering sheet 58 that wraps at least the back and side surfaces of the absorbent core 56. Further, a holding sheet 80 is provided between the absorbent core 56 and the back side portion (lower portion) of the covering sheet 58.
- FIG. 4 shows a first form of the absorbent body.
- the absorbent body 50 includes an absorbent core 56 having a fiber assembly 21 and superabsorbent polymer particles 54, and at least a back surface and a side surface of the absorbent core 56.
- a covering sheet 58 to be wrapped, and the adhesive 24 is continuously applied on the entire surface or substantially the entire surface of the covering sheet 58 where the superabsorbent polymer particles are provided. .
- substantially the entire surface means 80% of the portion where the superabsorbent polymer is provided.
- a layer made of the superabsorbent polymer 22 is provided on the inner surface of the covering sheet 58 via the adhesive 24, and further from the fiber assembly 21 via the adhesive 25 thereon.
- a covering sheet 58 is bonded on the fiber assembly 21 via an adhesive.
- the covering sheet 58 in the illustrated example can be wrapped between two upper and lower sheets that are configured to wrap the fiber assembly 21 and the superabsorbent polymer 54 by being folded back on both sides.
- an absorbent sheet such as crepe paper or non-woven fabric is preferably used.
- the entire surface or substantially the entire surface of the covering sheet 58 where the superabsorbent polymer is provided is surrounded by a portion coated with an adhesive and a plurality of portions coated with the adhesive.
- the adhesive 24 When the adhesive 24 is applied in a continuous surface, curtain coating or roll coating can be used. Further, in the case of providing a portion to which an adhesive is applied and a portion without a plurality of adhesives surrounded by the portion to which the adhesive is applied, a snoral coating can be used.
- a thermoplastic resin that can be used for a fiber assembly noinder described later can be suitably used.
- the superabsorbent polymer particles 54 are adhered to the covering sheet 58 by the adhesive 24, or a part of the superabsorbent polymer particles 54 is the adhesive 24.
- the superabsorbent polymer particles 54 are bonded to the enveloping sheet 58, and most of the superabsorbent polymer particles 54 are constrained in the closed space that does not have the adhesive surrounded by the portion to which the adhesive is applied. Further, part or all of the superabsorbent polymer particles 54 are bonded to the fiber assembly 21 by the adhesive 25. Therefore, it is possible to effectively prevent a crisp feel and an unintended deviation in absorption characteristics.
- Reference numeral 26 indicates an adhesive that bonds the surface of the fiber assembly 21 opposite to the polymer side surface and the covering sheet 58.
- FIG. 5 shows a second form of the absorbent body, which is different from the first form in that the superabsorbent polymer 54 is also retained in the fiber assembly 21.
- FIG. 6 shows a third form of the absorbent body.
- the first form in which the superabsorbent polymer 54 is provided only on one side (lower side) of the fiber assembly 21 is shown above and below the fiber assembly 21. The difference is that a superabsorbent polymer 54 is provided on each side. In this case, the superabsorbent polymer 54 positioned on the upper side of the fiber assembly 21 can be bonded to the fiber assembly 21 by the adhesive 28.
- FIG. 7 shows a fourth form of the absorbent body.
- the superabsorbent polymer 54 is also held in the fiber assembly 21 as in the second form. .
- FIG. 8 shows a fifth form of the absorbent body, in which the superabsorbent polymer 54 attached to the covering sheet 58 in the second form and the adhesive 25 for bonding are omitted, and the fiber collection is omitted.
- the superabsorbent polymer 54 is held only in the coalescence 21.
- FIG. 9 shows a sixth form of the absorbent body.
- only the fiber aggregate is separately provided on the fiber aggregate 21 holding the superabsorbent polymer 54 (superabsorbent polymer 54
- the fiber assembly 21 holding the superabsorbent polymer 54 and the fiber assembly-only layer 21B are bonded with an adhesive 26B.
- FIG. 10 and 11 show a sixth embodiment of the absorber 50.
- FIG. The absorbent body 50 has a fiber assembly made of tows composed of fibers and an absorbent core 56 having a superabsorbent polymer, and an enveloping sheet 58 that wraps these cores.
- the amount of the polymer is relatively large, the portion is small, and the portion is small. Some of this amount is indicated by shading in the figure. With this configuration, it is possible to intentionally bias the absorption characteristics, particularly the absorption amount.
- the amount of the superabsorbent polymer in the intermediate portion 50C in the width direction of the fiber assembly is made larger than the amount of the superabsorbent polymer in the longitudinal side portions 50S of the fiber assembly.
- the width of the absorbent article in the example shown, disposable diaper DP
- the amount of the superabsorbent polymer in the longitudinal intermediate portion 50M of the fiber assembly is made larger than the amount of the superabsorbent polymer in the longitudinal direction 50E of the fiber assembly.
- This is also a preferred form.
- the absorbent article in the illustrated example, the disposable diaper DP
- it is possible to secure a large amount of absorption in the longitudinal intermediate portion 50M to which more liquid is supplied.
- the superabsorbent polymer is not provided in the cut portions 50e at both ends in the longitudinal direction. It is possible to prevent the life of the cutter blade from being shortened during manufacturing. Such a form can be produced by setting the application amount of the superabsorbent polymer in three stages (large 'less', no), and repeating a cycle consisting of a small 'large', little, and none.
- the amount of the superabsorbent polymer at both longitudinal end portions 50E and 50E can be made larger than the amount of the superabsorbent polymer at the longitudinal intermediate portion 50M.
- the longitudinal direction of the absorbent body 50 is divided into three parts, that is, an intermediate part and both end parts.
- the amount of the superabsorbent polymer is made different by dividing it into two parts or four or more parts. It is also possible to change the amount of the superabsorbent polymer continuously in the longitudinal direction of the absorbent body 50.
- the superabsorbent polymer may be held in the fiber assembly, on the surface of the fiber assembly, or both. Furthermore, the high-absorbency polymer may be retained only partially on the surface of the fiber assembly, and may be retained entirely within the fiber assembly.
- the superabsorbent polymer particles are dispersed substantially throughout the thickness direction with respect to the fiber assembly.
- This state of being dispersed substantially throughout the thickness direction is conceptually shown as an enlarged view of the main part in FIG.
- symbol 52 in FIG. 13 has shown the constituent fiber (filament) of a fiber assembly.
- the amount of superabsorbent polymer particles in each part (hereinafter referred to as dispersion density) is large or small in at least one of the width direction, the longitudinal direction, and the thickness direction of the product.
- dispersion density the amount of superabsorbent polymer particles in each part.
- the dispersion density of the superabsorbent polymer particles is large is summarized as follows. As shown in Fig. 15, with respect to the absorbent core 56, the width direction of the product is X, the longitudinal direction is Y, and the thickness direction is ⁇ . If we define larger (higher) than other regions as ⁇ close '', and define the case where the superabsorbent polymer particles have the same dispersion density as ⁇ uniform '', the specific effects of each form are expressed. 2 to Table 4 as shown. Of course, each condition can be used in combination.
- SAP reduces the 3 ⁇ 43 ⁇ 4 feeling and SAP movement during use is small.
- FIG. 16 shows an eighth embodiment of the absorber.
- the absorbent body 50 has an absorbent core 56 including a fiber assembly and a superabsorbent polymer, and a covering sheet 58 that wraps the absorbent core 56.
- the density of the superabsorbent polymer in the fiber assembly is as follows. Are provided with a relatively high part, a low part, and a low part. This level of density is indicated by gradation in the figure. As described above, if a portion having a relatively high density and a portion having a relatively low density of the superabsorbent polymer in the fiber assembly is provided, it is possible to intentionally bias the absorption characteristics, particularly the absorption rate.
- the density of the superabsorbent polymer in the intermediate portion 50C in the width direction is higher than the density of the superabsorbent polymer in both side portions 50S in the width direction.
- the absorption speed of the intermediate portion 50C in the width direction is slow, and the absorption speed of the both side portions 50S in the width direction is high. Therefore, when the absorbent article is used with the width direction aligned, a large amount of liquid is supplied to the longitudinal direction intermediate part in the width direction intermediate part 50C, and the surroundings are good from there. Since it diffuses well, a wider area can be used for absorption, and so-called side leakage is prevented because the absorption speed at both side portions 50S in the width direction is high.
- FIG. 17 shows a ninth embodiment of the absorber.
- the absorbent body 50 includes an absorbent core 56 including a fiber assembly and a superabsorbent polymer, and a covering sheet 58 that wraps the absorbent core 56.
- the fiber density in the fiber assembly is relatively high. A high part and a low part are provided in the case.
- the fiber density is indicated by the density of the lines in the figure. Tuka fiber aggregates have the property of diffusing liquid along the continuous direction of the fibers, and this tendency becomes more pronounced as the density increases. Therefore, the intended bias can be given to the absorption characteristics of the absorbent body 50 by providing the fiber assembly with relatively high and low fiber density portions.
- Such high and low fiber density is caused by performing partial fiber opening, such as partial strong fiber opening in the production of a fiber assembly, or by partially using a plurality of tows bundled together. Can be achieved.
- the fiber density force of the width direction intermediate portion 50C is preferably higher than the fiber density of the width direction both side portions 50S.
- the fiber aggregate has the characteristics that if the fiber density is low, the fluid retention is excellent, while if the fiber density is high, the fluid diffusion is excellent. Therefore, if a difference in power density is provided, body fluid diffuses quickly in the intermediate portion 50C in the width direction, and body fluid retention improves in both side portions 50S that do not require rapid diffusibility.
- a preferable characteristic is given to each part. More specifically, the diffusibility of the body fluid in the width direction intermediate part 50C is higher than the diffusibility of the body fluid in the both sides 50S in the width direction. Body fluid easily diffuses in the width direction intermediate part 50C to which the liquid is supplied, so that a larger area can be used for absorption, and the liquid is difficult to diffuse in the width direction side parts 50S, so-called side leakage is also effective. To be prevented.
- the fiber density of both side portions 50S should be 10 to: LOOgZm 3 regardless of the difference in fiber density between the width direction both side portions 50S and the width direction intermediate portion 50C.
- the preferred range is 20 to 70 g / m 3, and the more preferred range is 30 to 50 g / m 3 .
- Both sides If the fiber density of 50S is too low, the fiber assembly may be twisted in the width direction. On the other hand, if the fiber density at both end portions is too high, the wearer may feel uncomfortable.
- the fiber assembly 21 side (upper side in the figure) is the body fluid receiving side. Recommended for use!
- Fig. 18 shows an arrangement example of the absorbent body in the disposable diaper DP or sanitary napkin NP.
- a fiber assembly in which the tow is spread has a characteristic that body fluid easily diffuses in the continuous direction (flow direction) of the fiber, but body fluid hardly diffuses in a direction perpendicular to the continuous direction of the fiber. .
- the absorbent body 60 is provided so that the continuous direction of the fibers (represented by a number of lines) is along the longitudinal direction (front-rear direction) of the article. Desirable force
- the fiber continuous direction can be provided along the width direction of the article.
- a fiber assembly is formed by opening a tow (fiber bundle), which is a bundle of filaments substantially regarded as continuous fibers, that is, an assembly of filaments.
- tow constituent fibers include polysaccharides or derivatives thereof (cellulose, cellulose ester, chitin, chitosan, etc.), synthetic polymers (polyethylene, polypropylene, polyamide, polyester, polylactamamide, polyvinyl acetate, etc.). Capable force In particular, cellulose ester and cellulose are preferred.
- cellulose cellulose derived from plants such as cotton, linter, and wood pulp, buttery cellulose, etc. can be used.
- Regenerated cellulose which may be regenerated cellulose such as rayon, is a spun fiber. Moyo.
- cellulose esters examples include organic acid esters such as cellulose acetate, cellulose butyrate, and cellulose propionate; cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate phthalate, Mixed acid esters such as cellulose nitrate acetate; and poly force prolatathone graft Cellulose ester derivatives such as cellulose ester can be used. These cellulose esters can be used alone or in admixture of two or more.
- the viscosity average degree of polymerization of the cellulose ester is, for example, about 50 to 900, preferably about 200 to 800.
- the average substitution degree of the cellulose ester is, for example, about 1.5 to 3.0 (for example, 2 to 3).
- the average degree of polymerization of the cellulose ester can be, for example, about 10 to 1000, preferably about 50 to 900, and more preferably about 200 to 800.
- the average degree of substitution of the cellulose ester is, for example, about 1 to 3. It is preferably about 1 to 2.15, more preferably about 1.1 to 2.0.
- the average degree of substitution of the cellulose ester can be selected from the viewpoint of enhancing biodegradability.
- an organic acid ester for example, an ester with an organic acid having about 2 to 4 carbon atoms
- cellulose acetate is suitable.
- the acetylation degree of cellulose acetate is often about 43 to 62%, but about 30 to 50% is particularly preferable because it is excellent in biodegradability.
- a particularly preferred cellulose ester is cellulose diacetate.
- the tow constituting fiber may contain various additives, for example, a heat stabilizer, a colorant, an oil, a yield improver, a whiteness improver, and the like.
- the fineness of the tow constituting fiber can be, for example, about 1 to 16 denier, preferably about 1 to 10 denier, and more preferably about 2 to 8 denier.
- the tow constituent fiber may be a non-crimped fiber, but is preferably a crimped fiber.
- the crimped degree of the crimped fiber can be, for example, 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used. When crimped fibers are used, a bulky and lightweight absorbent core can be produced, and a tow with high unity can be easily produced by entanglement between the fibers.
- the cross-sectional shape of the tow constituting fiber is not particularly limited, and may be any shape such as a circular shape, an oval shape, an irregular shape (for example, a Y shape, an X shape, an I shape, an R shape) or a hollow shape. May be.
- the fiber constituting the fiber is, for example, in the form of a tow (fiber bundle) formed by bundling about 3,000 to 1,000,000, preferably about 5,000-1,000,000 single fibers. Can be used.
- the fiber bundle is about 3,000 to 1,000,000 continuous fibers It is preferable to consolidate the fibers.
- the tow can use a binder having an action of adhering or fusing the contact portions of the fibers mainly for the purpose of maintaining the shape.
- the noda include ester plasticizers such as triacetin, triethylene glycol diacetate, triethylene glycol dipropionate, dibutyl phthalate, dimethoxyethyl phthalate, and citrate triethyl ester, as well as various types of resin adhesives, particularly thermoplastic resins. Fats can be used.
- thermoplastic resin used as the binder is a resin that exhibits an adhesive force when melted and solidified, and includes water-insoluble or poorly water-soluble resins and water-soluble resins. Water-insoluble or poorly water-soluble rosin and water-soluble rosin can be used in combination as necessary.
- water-insoluble or poorly water-soluble resins include olefin-based homo- or copolymers such as polyethylene, polypropylene, ethylene-propylene copolymer, and ethylene acetate butyl copolymer, poly (butyl acetate), and polymethacrylic acid.
- olefin-based homo- or copolymers such as polyethylene, polypropylene, ethylene-propylene copolymer, and ethylene acetate butyl copolymer, poly (butyl acetate), and polymethacrylic acid.
- Acrylic resin such as methyl, methyl methacrylate-acrylic acid ester copolymer, copolymer of (meth) acrylic monomer and styrenic monomer, polyvinyl chloride, butyl acetate butyl copolymer, polystyrene Styrene polymers such as copolymers of styrene monomers and (meth) acrylic monomers, polyesters that may be modified, polyamides such as nylon 11, nylon 12, nylon 610, nylon 612, rosin derivatives ( For example, rosin ester), hydrocarbon resin (for example, terpene resin) Dicyclopentadiene ⁇ , petroleum ⁇ ), such as hydrogen added hydrocarbon ⁇ can be used. These thermoplastic rosins can be used singly or in combination.
- the water-soluble rosin has various water-soluble polymers such as polybulal alcohol, polypyrrole pyrrolidone, polybull ether, bulll monomer, carboxyl group, sulfonic acid group or a salt thereof.
- Vinyl water-soluble resins such as copolymers with copolymerizable monomers, acrylic water-soluble resins, polyalkylene oxides, water-soluble polyesters, water-soluble polyamides, and the like can be used.
- These water-soluble coagulants can be used alone or in combination of two or more.
- thermoplastic resin antioxidants, stabilizers such as UV absorbers, fillers, plasticizers
- additives such as preservatives and antifungal agents may be added.
- binder components that inhibit penetration of superabsorbent polymer particles should be avoided whenever possible. It is best not to use binder components that inhibit the entry of superabsorbent polymer particles.
- tow can be produced by a known method, it will not be described in detail.
- Cellulose diacetate tow bale that can be suitably used in the absorber 50 is commercially available from Cera-Izu, Daicel Chemical Industries. Cellulose diacetate tow bale has a density of about 0.5 gZ cm 3 and a total weight of 400-600 kg.
- the tow is peeled off and opened in a wide band shape so as to have a desired size and bulk.
- the opening width of the tow is arbitrary, and can be, for example, a width of 100 to 2000 mm, preferably about 100 to 300 mm, which is the width of the absorbent core of the product. Also, the density of the absorbent core can be adjusted by adjusting the degree of tow opening.
- the fiber aggregate those having a fiber density of not more than 0.007 gZcm 3 when the thickness is set to 10 mm, particularly 0.006 to 0.0070 gZcm 3 are preferable. If the fiber density is excessively high, the advantage of using a fiber assembly formed by opening a tow is reduced. For example, it is difficult to reduce the weight and thickness.
- the basis weight of the fiber aggregate 30 ⁇ 300GZm 2, what is 30 ⁇ 90GZm 2 especially is preferred. The fiber basis weight can be adjusted by selecting the tow that will be the raw fabric or the production conditions.
- Tow opening methods include, for example, a method in which the tow is spread over a plurality of opening rolls, and the tow width is gradually expanded as the tow progresses, and the tow tension (elongation) is used.
- a method of repeatedly opening and relaxing (shrinking) and a method of widening and opening using compressed air can be used.
- Superabsorbent polymers include starch, cellulose, and synthetic polymers, such as starch acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and cross-linked sodium carboxymethyl cellulose. And acrylic acid (salt) polymers can be used.
- the shape of the superabsorbent polymer a commonly used particulate form is suitable, Other shapes can also be used.
- the superabsorbent polymer particles mean to include “powder” in addition to “particles”.
- the particle diameter of the superabsorbent polymer particles those used for this type of absorbent article can be used as they are, and for example, those having a particle size of 20 to 850 m can be suitably used.
- superabsorbent polymer particles having the following characteristics can be used. Average particle size: approx. 350 m
- the performance of the superabsorbent polymer is preferably a force that can be used without any limitation and having a water absorption of 5 OgZg or more.
- the superabsorbent polymer those having a water absorption rate of 45 seconds or less are preferably used. When the water absorption speed exceeds 45 seconds, so-called reversal of the body fluid supplied into the absorbent body easily returns to the outside of the absorbent body is likely to occur.
- a gel having a gel strength of 900 Pa or more is preferably used as the superabsorbent polymer. Thereby, even if it is a case where it is set as a bulky absorption core by using tow
- the basis weight of the superabsorbent polymer can be appropriately determined according to the amount of absorption required for the use of the absorber. Therefore, although it cannot be generally stated, for example, it can be 400 g / m 2 or less. If the amount of polymer is too small, the absorption performance cannot be maintained.On the other hand, if the amount is too large, the excess of high-absorbent polymer particles that cause the effect to saturate will give the above-mentioned crisp discomfort. Become.
- the superabsorbent polymer particles can adjust the spray density or spray amount in the plane direction of the absorbent core 56.
- the amount of body fluid excretion can be spread more than other parts.
- men's use The degree (amount) can be increased, and women can increase the spray density (amount) in the center.
- absorbent core can adjust the spray density or spray amount in the plane direction of the absorbent core 56.
- a plurality of superabsorbent polymer particles having different particle size distributions are prepared, and can be sequentially sprayed and projected in the thickness direction.
- the superabsorbent polymer particle spraying means 90 described later is arranged in a plurality of lines at intervals, and the particle size distribution is small first. By spreading and projecting, it is possible to distribute a small particle size distribution on the lower side in the absorbent core 56 and a large particle size distribution on the upper side. This form is effective for allowing the one having a small particle size distribution to penetrate deep into the fiber assembly.
- the ratio between the superabsorbent polymer and the fiber assembly determines the absorption characteristics.
- a weight ratio in a planar area of 5 cm ⁇ 5 cm in the region directly receiving the body fluid in the absorbent core 56 it is desirable that the weight of the superabsorbent polymer Z fiber is 1 to 14, particularly 3 to 9.
- the size of the absorbent core 56 is preferably such that the planar projection area is 250 cm 2 or more and the thickness is 0.5 to LOmm, particularly 1 to 5 mm.
- the absorbent core preferably has a weight of 25 g or less, particularly 10 to 20 g. Absorbing core weight force S Within this range, the advantage of not using a special member becomes particularly significant.
- the compression resilience RC of the absorbent core 56 is preferably 40-60%, particularly 50-60%. Thereby, sufficient absorption property can be exhibited with absorption core itself.
- the compression energy WC of the absorbent core 56 is 4.0 to: LO. Ogf 'cmZcm 2 , since it can be compressed compactly at the same level or higher than before when packaging.
- These compression characteristics are determined by adjusting the fiber density of the fiber assembly by opening, etc., selecting the fiber material, selecting the type of binder such as a plasticizer, adjusting the degree of treatment, or a combination of these. It can be adjusted by matching.
- the compression energy is the energy consumption when pressing the center part of a specimen cut to a length of 200mm and a width of 50mm up to 50g (example is the thickness at this time). is there.
- This compression energy can be measured by a handy compression tester (KES-G5, manufactured by Kato Tech Co., Ltd.).
- the measurement conditions for this tester are: SENS: 2, force gauge type: lkg, SPEED RANGE: STD, DEF sensitivity: 20, pressurization area: 2 cm 2 , loading interval: 0.1 (standard), STROKE SET: 5.0, upper limit load: 50 gfZcm 2
- the compression resilience is a parameter representing the recoverability when the fiber is compressed. Therefore, if the recoverability is good, the compression resilience increases.
- This compression Les Jiriensu can by handy compression tester (KE s-G5, manufactured by Kato Tech Co., Ltd.), is measured. The measurement conditions for this tester are the same as for the compression energy.
- a tissue pen particularly a crepe paper, a nonwoven fabric, a polylaminated nonwoven fabric, a sheet having small holes, or the like can be used. However, it is desirable that the sheet does not allow the superabsorbent polymer particles to escape.
- hydrophilic SMMS spunbond Z meltblown Z meltblown Z spunbond
- non-woven fabrics instead of crepe paper
- materials such as polypropylene and polyethylene Zpolypropylene can be used.
- the basis weight is preferably 8 to 20 g / m 2 , particularly 10 to 15 g / m 2 .
- This covering sheet 58 has a form that wraps the entire layer of the fiber aggregate and the superabsorbent polymer particles 54 as shown in FIG. 3, and only the back and side surfaces of the layer as shown in FIG. 19, for example. It may be enveloping. Although not shown, only the upper and side surfaces of the absorbent core 56 are covered with a woven paper nonwoven fabric and the lower surface is covered with a body fluid impermeable sheet such as polyethylene, and the upper surface of the absorbent core 56 is covered with a crepe paper nonwoven fabric. The side and bottom surfaces may be covered with a body fluid impermeable sheet such as polyethylene, etc. (each of these materials is a constituent element of the enveloping sheet). If necessary, the fiber aggregate and the superabsorbent polymer particles 54 may be sandwiched between two upper and lower sheets or arranged on the bottom and top surfaces. It is difficult to prevent the movement of the mer particles.
- the superabsorbent polymer particles 54 can be interposed between the holding sheet 80 and the absorbent core 56 by spraying or the like.
- the superabsorbent polymer particles 54 may pass through the fiber assembly at the time of application to the fiber assembly or during the subsequent process or until the consumer uses it.
- the unevenness of the superabsorbent polymer particles that have passed through the fiber aggregate gives a crisp and uncomfortable feeling when touched by the hand when the consumer uses it. Therefore, a holding sheet 80 having a holding performance of the absorbent polymer is interposed between the absorbent core 56 and the covering sheet 58.
- This holding sheet 80 reinforces the stiffness that is not sufficient only by the covering sheet 58 such as tissue paper (crepe paper), and reduces or prevents a sense of incongruity when touched by the hand when the consumer uses it.
- the material of the holding sheet 80 is not particularly limited as long as it has a holding performance of the absorbent polymer.
- the absorbent polymer for example, non-woven fabric, crimped pulp, low-absorbency cotton fiber (for example, non-degreased cotton fiber, degreased cotton fiber, rayon fiber treated with a water repellent or a hydrophobizing agent, etc.).
- Low-absorbency cotton fiber for example, non-degreased cotton fiber, degreased cotton fiber, rayon fiber treated with a water repellent or a hydrophobizing agent, etc.
- Polyethylene fiber polyester fiber, acrylic fiber, polypropylene fiber, silk, cotton, hemp, nylon, polyurethane, acetate fiber and the like.
- the holding sheet 80 When the holding sheet 80 is a non-woven fabric, the holding sheet 80 has a compression energy force based on the KES test SO. 01 to: LO. OOgfcm / cm 2 , preferably 0.01 to 1. OOgfcm / cm 2 And a compression resilience of 10 to 100%, preferably 70 to 100%.
- the holding sheet 80 has a stiffness in the longitudinal direction of the product of 0.05-0.5-0.75 g'cm 2 / cm, it does not reduce or cause the crisp discomfort caused by the superabsorbent polymer particles. Therefore, it is suitable.
- the “back and forth elasticity of the product” is a pure bending tester (KES-FB2 made by Kato Tech Co., Ltd.) Means the value obtained when bent in the range of DFE sensitivity 20 and curvature range 0.Ocm- 1 to 0.5cm- 1 .
- the holding sheet 80 is provided is to hold, for example, the absorbent polymer that has fallen down (dropped out) from the absorbent core 56, as mentioned above. Therefore, since the superabsorbent polymer particles that have slipped out come into contact with the user via the covering sheet 58 and the holding sheet 80, there is no possibility of being conveyed to the user as a sense of incongruity.
- the non-woven fabric having the above-described compression energy and compression resilience sufficiently exhibits the function as a holding sheet.
- the absorbent polymer that has slipped out is held by the holding sheet 80 and does not move on the covering sheet 58, there is no possibility of uneven absorption capacity.
- a hot melt adhesive or the like having adhesiveness can be applied on the holding sheet 80 in advance.
- the upper surface of the holding sheet 80 may be roughened so that the superabsorbent polymer particles can be prevented from moving on the holding sheet 80. Examples of the roughening or fluffing means for this purpose include a non-net surface that is not a net surface at the time of manufacturing the nonwoven fabric, a marble force check, a processing by a needle punch, and a brushing check. .
- the holding sheet 80 Even if the holding sheet 80 is provided only under the absorbent core 56 as shown in Fig. 3 or the like, the holding sheet 80 passes through the side surface of the absorbent core 56 and is rolled up to the upper surface of the absorbent core 56 as shown in Fig. 14. It may be extended. It is also possible to use a plurality of holding sheets 80 in a stacked manner.
- the above example is an example in which the holding sheet 80 is provided between the absorbent core 56 and the back side portion of the covering sheet 58, but the holding sheet 80 may be on the back side from the covering sheet 58.
- the need to allow the covering sheet 58 itself to function as a holding sheet without providing the holding sheet 80 is the back side of the absorbent core 56. If a holding sheet is provided on the back surface of the product, it is possible to reduce or not cause a crisp discomfort when touching the back surface of the product.
- the body fluid impervious sheet 70 simply means a sheet disposed on the back side of the absorbent core 56, and in the present embodiment, a sheet with the absorbent core 56 interposed between the top sheet 30 and It has become. Therefore, the material of the main body liquid-impermeable sheet is not particularly limited. Specifically, for example, polyolefin resin such as polyethylene or polypropylene, laminated nonwoven fabric in which a nonwoven fabric is laminated on a polyethylene sheet or the like, or a nonwoven fabric that is substantially impervious to liquids by interposing a waterproof film (in this case, A body fluid-impermeable sheet is composed of a waterproof film and a non-woven fabric.
- materials having liquid impermeability and moisture permeability which have been preferred in recent years from the viewpoint of preventing stuffiness, can also be exemplified.
- an inorganic filler is kneaded in an olefin-based resin such as polyethylene or polypropylene, and the sheet is formed, and then uniaxial or biaxial direction. Examples thereof include a microporous sheet obtained by stretching the film.
- the body fluid impervious sheet 70 has a force capable of preventing side leakage of bodily fluids by extending it to the use surface in a so-called framed form (not shown). This is prevented by interposing the second body fluid impermeable sheet 72 between the double barrier sheets 64 forming the noir cuff 60. According to this configuration, the second body fluid impermeable sheet 72 extends until the Norriya cuff 60 is erected! /. There is also an advantage that side leakage of loose stools between 60 can be prevented.
- Barrier force hose 60, 60 provided on both sides of the product is provided to prevent urine and loose stool that move laterally along the top sheet 30 and prevent side leakage. Element.
- the illustrated noir cuff 60 is formed by doubling the barrier sheet and covers the folded portion of the top core 30 from the back side of the absorbent core 56 and protrudes to the front side. It is formed as follows. In order to prevent the urine from moving on the top sheet 30 in the lateral direction, in particular, the side cuff of the body fluid impervious sheet 70 is inserted between the double nonwoven fabric sheets, and the noir cuff protruding from the surface side 60 It extends to the middle.
- the force of the barrier cuff 60 itself can be designed appropriately.
- an elastic elastic member such as a rubber thread 62 is provided at the tip and middle of the protrusion of the barrier cuff 60. Is fixed under extension, and in the state of use, the Norriya cuff 60 stands up due to its contraction force.
- the middle part of rubber thread 62 in the middle is positioned on the center side of thread rubbers 62 and 62 at the front end and fixed to the front and rear ends of topsheet 30. The side is erected diagonally toward the center, and the tip end is inclined obliquely outward from the middle part.
- the material of the noir sheet is not particularly limited as long as it has a property of permeating body fluids or a property of not permeating body fluids.
- the same material as exemplified as the top sheet 30 and the body fluid impermeable sheet 70 can be used.
- a bulky nonwoven fabric such as an air-through nonwoven fabric, which is preferably a nonwoven fabric.
- a water-repellent nonwoven fabric or a hydrophilic nonwoven fabric can be used alone or in combination.
- a water-repellent treatment coated with a water-repellent nonwoven fabric such as a silicon-based, paraffin-based, or alkyl-kick-type water-repellent water repellent.
- a non-woven fabric is preferred.
- hydrophilic nonwoven fabrics such as nonwoven fabrics made of hydrophilic natural fibers, synthetic fibers, regenerated fibers, etc., as well as nonwoven fabrics obtained by hydrophilic treatment of non-hydrophilic fibers with a hydrophilic agent are used. Can be used.
- the type of elastic elastic member is not particularly limited as long as it has elasticity.
- stretchable hot melt, stretchable film, thread rubber, flat rubber and the like can be exemplified.
- the material include styrene-based, olefin-based, urethane-based, and ester-based rubbers, and foams such as polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, and polyester.
- a part in the thickness direction of the absorbent core 56 from the surface side of the top sheet 30 is formed so as to reach almost the entire surface, or the embossed recess E is formed so that the surface side force of the top sheet 30 also reaches the holding sheet 80 as shown in FIG. 21 (c). Can do.
- the intermediate sheet 40 has a basis weight of 8 to 40 gZm 2 , a thickness of 0.2 to 1.5 mm, and a top sheet.
- the amount of sludge is 5 to 80 g / m 2 and the thickness is 0.2 to 3.5 mm because embossing force can be sufficiently obtained under the condition that liquid permeability is not hindered. .
- the intermediate sheet 40 without forming a recess in the top sheet 30 may be formed with an embossed recess, and the top sheet 30 and the intermediate sheet 40 may be further formed with a recess.
- a recess by embossing may be formed only on 56, or a recess by embossing may be formed only on the absorbent core 56 without forming recesses on the top sheet 30, the intermediate sheet 40, and the covering sheet 58. .
- the recess E has an effect of inducing and diffusing body fluid in the extending direction. Therefore, when the concave portion E is substantially continuous in a groove shape (including the case where a plurality of concave portions are arranged at intervals to form a single groove), the body fluid is removed from the surface side before reaching the absorbent core. It will diffuse through the recesses E in the layer, allowing a wider part of the absorbent core to be used for absorption. Therefore, the absorbent capacity of the entire product is increased, and the absorbent article is less likely to cause side leakage or reversal due to insufficient absorption capacity.
- the absorption core 56 made of tow tends to be less rigid than the conventional pulp material, but it is preferable to form a recess by embossing in the absorption core 56 because the rigidity can be increased.
- the embossing force can be integrated so as to reach the absorption core 56 from the back surface side of the holding sheet 80, the covering sheet 58, the body fluid impermeable sheet 70 or the exterior sheet 12.
- a recess on the back surface side is preferably formed together with the recess E on the front surface side, but only the recess on the back surface side can be formed without forming the recess E on the front surface side.
- the shape of the recesses can be the same on the front and back sides, or the front and back sides can be different.
- the concave portion formed by embossing has an effect of inducing and diffusing body fluid in the extending direction. It also has the effect of increasing rigidity. Therefore, it is desirable that the shape of the embossed recess be determined in consideration of these effects.
- the recesses are substantially continuous in a groove shape (including the case where a plurality of recesses are arranged in a row and form a single groove), and a plurality of recesses are arranged in a dot-like manner at intervals. It may be.
- planar pattern groove-like or dot-like concave portions are arranged in the product longitudinal direction, width direction, a combination of these, a zigzag shape that reciprocates in the width direction (staggered shape), or irregularly. Can be used. Furthermore, appropriate forms such as a pin shape, a Mt. Fuji shape, and a bellows shape can be adopted.
- the constituent members of the absorbent main body 20 are fixed to each other with a hot melt adhesive or the like.
- Adhesive can be applied by curtains, spirals, slots, control seams (omega-shaped coating), bead coating, etc.
- FIG.22 and FIG.23 has shown the example of the tape type disposable diaper.
- FIG. 23 shows a slightly exaggerated view of the force-absorbing main body 20 as viewed in the direction of arrows 4-4 in FIG.
- the tape-type disposable diaper 10A has a fastening piece attached to both ends of the back side of the diaper, has a hook element on a fastening surface of the fastening piece, and forms a back sheet of the diaper.
- This is a diaper in which the non-woven fabric laminate is used and the hook element of the fastening piece can be engaged with any part of the surface of the backsheet when the diaper is attached.
- the absorbent main body 20 has an absorbent core 56 interposed between a top sheet 30 and a body fluid impermeable sheet 70.
- the absorbent core 56 is entirely wrapped with a covering sheet 58 of tissue paper, and has a rectangular shape when viewed in plan.
- a holding sheet 80 is provided between the absorbent core 56 and the covering sheet 58.
- an intermediate sheet 40 is interposed between the top sheet 30 and the absorbent core 56.
- the body fluid impermeable sheet 70 has a rectangular shape wider than the absorbent core 56, and a back sheet 12A having an hourglass-shaped nonwoven fabric is provided on the outer side thereof.
- the top sheet 30 has a rectangular shape wider than the absorbent core 56, extends slightly outward from the side edge of the absorbent core 56, and is fixed to the body fluid impermeable sheet 70 with a hot melt adhesive or the like.
- a barrier force hose 60A that protrudes toward the use surface is formed.
- the knurled cuff 60A has a non-woven sheet 64 that also has a non-woven fabric force substantially continuous in the width direction, and an elastic expansion and contraction. It is composed of a member, for example, one or a plurality of leg rubber elastic elastic members for the leg elastic force. 130 is a fasting piece with a hook-and-loop fastener.
- the inner surface of the NORY sheet 64 has a fixing start at a position separated from the side edge of the top sheet 30, and this fixing start end also extends to the extending edge of the body fluid impermeable sheet 70 outward in the width direction.
- the part is fixed by a hot melt adhesive or the like.
- the outer surface of the liner sheet 64 is fixed to the back sheet 12A on the lower surface thereof by a hot melt adhesive or the like.
- an elastic elastic member for gasket cuffs, for example, thread rubber 66 is provided.
- the starting end of the inner surface of the liner sheet 64 to the body fluid-impermeable sheet 70 forms an upstanding end of the barrier force hose 60A.
- the inside of the standing end is a free part that is not fixed to the product body, and this free part comes to stand by the contraction force of the rubber thread 62.
- the fastening piece 130 by using a hook-and-loop fastener as the fastening piece 130, it can be mechanically fixed to the backsheet 12A. Therefore, the so-called target tape can be omitted, and the fastening position by the fastening piece 130 can be freely selected.
- a base portion of a fastening base material such as plastic, polylaminated nonwoven fabric, or paper is joined to the back sheet 12A, for example, with an adhesive, and has a hook element 130A on the tip side.
- the hook element 130A is bonded to the fastening substrate with an adhesive.
- the hook element 130A has a large number of engaging pieces on the outer surface side thereof.
- a temporary fixing adhesive portion 130B is provided on the tip side from the hook element 130A.
- the temporary adhesive section 130B is bonded to the force barrier sheet 64 to fasten the fastening section 130.
- the end side peeling is prevented. In use, it peels off against the adhesive force and brings the front end of the fastening piece 130 to the front body.
- the fastening base material is exposed at the tip side from the temporary fixing adhesive portion 130B, and is a tab portion.
- a target printing sheet 74 as a design sheet is provided on the inner surface side of the knock sheet 12A, which serves as a guide for fixing the hook element 130A of the fastening piece 130.
- the target print with the design is made and the back sheet is externally applied.
- the diaper When the diaper is worn, the diaper is attached to the body in the shape of a boat, and the contraction force of the rubber thread 62 acts on the leg. To do.
- the space surrounded by the standing part forms a confined space for urine or soft stool.
- the urine is absorbed into the absorbent core 56 through the top sheet 30 and the solid part of loose stool becomes the barrier of the rising part of Noriya cuffs 60A, and the rid of the urine can be overcome. Is prevented.
- side leakage is prevented by a stop function by the flat contact part.
- the liner sheet 64 forming each standing cuff is not liquid-permeable but substantially liquid-permeable (or semi-liquid-permeable).
- the nore sheet 64 may be repelled by silicon treatment or the like.
- the nore sheet 64 and the back sheet 12A are air permeable, and the barrier sheet 64 and the back sheet 12A are sheets having a hydrostatic pressure of lOOmmH 2 O or more, respectively.
- FIG. 24 shows an example of an absorbent body manufacturing facility, in which a continuous belt-like fiber assembly 52Z opened to a desired width 'density is supplied.
- opening for example, as shown in FIG.
- tow veil 52X to tow 5 2Y is fed sequentially, and in the conveying process, widening spread means 120 using compressed air and multiple spread rolls 126A, 126B, 126C with a faster peripheral speed on the downstream side roll
- the binder 140b for example, fill the box with mist of triacetin
- the fiber assembly that also has the desired width 'density tuka It can be the body 52Z.
- This fiber opening line can be directly connected to the absorbent body production line of FIG. 24, and the produced fiber assembly 52Z can be directly fed to the absorbent body production line.
- An adhesive can be applied to the fiber assembly 52Z supplied to the absorbent body production line prior to applying the superabsorbent polymer.
- an adhesive application device 114 is disposed on the upstream side of the polymer spraying position in the transport line.
- an adhesive made of thermoplastic resin (specific examples are as described above) can be suitably used.
- the adhesive is applied to the continuous surface using curtain coating or roll coating, and has a portion coated with the adhesive using spiral coating and a plurality of adhesives surrounded by the portion coated with the adhesive. A portion not to be provided can also be provided.
- the amount of adhesive applied should be appropriately determined. In the normal case, it is preferably lgZm 2 or more. However, if it is applied too much, the movement of the superabsorbent polymer is hindered, so it is preferable to set it within the range of 1 to 10 gZm 2 .
- the shielding plate 113 is provided on the upstream side of the adhesive application device 114 to block the compressed air AR. This shielding plate 113 is preferably provided at least on the adhesive applicator 114 side of the fiber assembly 52Z.
- the superabsorbent polymer particles 54 are then dispersed on the upper surface by the superabsorbent polymer particle spraying means.
- This spraying can be performed, for example, by simply dropping the superabsorbent polymer particles on the fiber assembly 52Z by its own weight.
- the application amount of the superabsorbent polymer particles 54 can be periodically changed as necessary.
- the spraying state and the non-spraying state are alternately repeated, and the portion provided with the superabsorbent polymer particles 54 and the portion not provided with the superabsorbent polymer particles 54 are alternately provided in the transport direction (the superabsorbent polymer particles 54 are (It is intermittently applied in the conveying direction) is one preferable mode.
- the superabsorbent polymer particles 54 are (It is intermittently applied in the conveying direction) is one preferable mode.
- a suitable length L1 slightly shorter than the length of one absorber for example, a length L2 including a sufficient cutting allowance centered on this by defining a cutting point C with an interval of 10 to 30 cm in the conveying direction
- it is particularly preferable that cutting is performed in a state where the superabsorbent polymer particles 54 are substantially not present (weight is less than 0. OlgZcm 2 ) over the entire width direction at about 5 to 20 mm.
- the application step and cutting step of the superabsorbent polymer particles 54 as is clear from the examples described later, compared to the case of cutting at the portion having the superabsorbent polymer particles 54.
- the life of the cutter blade is greatly extended.
- the fiber assembly 52Z in which the superabsorbent polymer particles 54 are dispersed is only rotated by the rotating roll, and can be sent to the subsequent process. It is also a preferred form to do.
- the vacuum roll 106 has an intake hole on the outer peripheral wall, and is configured to be sucked by a suction pump (not shown) from the inside over a predetermined range in the circumferential direction (a range substantially in the left half in the illustrated example).
- the fiber assembly on which the superabsorbent polymer particles 54 are dispersed is guided while being in contact with the outer peripheral surface by the vacuum roll 106.
- the sheet 58 when the sheet 58 is covered during suction, a stronger suction force acts on the high-absorbent polymer particles 54 than when nothing is covered, and the high-absorbent polymer particles 54 are efficiently attached. It moves to the fiber assembly 52Z and can be dispersed.
- a liquid permeable sheet such as a crepe paper, a nonwoven fabric, a perforated sheet, or a liquid impermeable sheet such as a polyethylene film can be used. In the illustrated example, this sheet is the force that only the covering sheet 58 is provided.
- the holding sheet 80 When the holding sheet 80 is provided, the holding sheet is supplied together with the covering sheet 58 (not shown), and these sheets and the fiber assembly Suction can be performed with 52Z stacked.
- an adhesive is applied to the fiber assembly 52Z prior to application of the superabsorbent polymer.
- An adhesive is applied to the fiber assembly 52Z after the application of the particles 54 and before the superabsorbent polymer particles 54 are moved into the fiber assembly 52Z.
- the highly absorbent polymer particles It is also possible to apply an adhesive to the fiber assembly 52Z while the post-spreading force of 54 reaches the vacuum roll 106.
- the sheet supply path to the vacuum roll 106 is provided. It is also possible to provide an adhesive application device 115 and supply the adhesive in advance to the surface of the sheet 58 on the fiber assembly 52Z side.
- the superabsorbent polymer particles 54 exposed on the surface of the fiber aggregate 52 Z are fixed to the sheet 58 via an adhesive, and the nonadherent superabsorbent polymer particles 54 are aggregated by the subsequent suction. It will be moved into the body 52Z.
- the adhesive may adhere to the vacuum roll 106 and cause clogging, etc., which may cause problems due to adhesion of the adhesive in the downstream equipment. Shina, I like to do it.
- an adhesive application device 116 is provided on the exposed side surface of the fiber assembly 52Z on the downstream side of the vacuum roll 106 (the surface opposite to the sheet 58 side, the upper surface in the drawing). It is also possible to supply an adhesive to the fiber assembly 52Z after the bulky superabsorbent polymer particles 54 are moved. By adopting this form, it is possible to fix the superabsorbent polymer particles 54 that have moved to the side opposite to the polymer application side in the fiber aggregate 52Z among the superabsorbent polymer particles 54 that have been imparted, to the fiber aggregate 52Z.
- the fiber assembly 52Z when the exposed side surface of the fiber assembly 52Z is covered with a separate sheet or both sides of the covering sheet 58 are wrapped around both ends of the fiber assembly 52Z as described above, the fiber assembly 52Z
- the superabsorbent polymer particles 54 that have moved to the exposed side surface can be fixed to the sheet 58.
- the supply of these adhesives can be applied in any one or a combination of two or more.
- an adhesive made of thermoplastic resin (specific examples are as described above) can be suitably used.
- the fiber assembly 52Z to which the superabsorbent polymer 54 is applied with force is covered with, for example, a separate sheet, or both sides of the sheet 58 are attached to both ends of the fiber assembly 10 by a sailor as shown in the figure. Is wrapped around and folded back, and then cut into a predetermined length to form individual absorbent bodies 50.
- the amount distribution of the superabsorbent polymer relative to the fiber aggregate 52Z, the density distribution of the superabsorbent polymer, and the fiber density distribution are preferably uniform for general purpose purposes, but have special absorption characteristics. If the purpose is to demonstrate, it is also preferable to provide a relatively large V, part 'small, part or high, part' small, part depending on the purpose.
- the polymer when the polymer is sprayed, a relatively large portion and a small portion can be provided in the planar direction.
- the height in the middle portion in the width direction of the fiber assembly 52Z is high.
- the superabsorbent polymer can be sprayed so that the amount of the absorbent polymer is larger than the amount of the superabsorbent polymer on both sides in the width direction of the fiber assembly 52Z.
- the amount of the superabsorbent polymer in the longitudinal intermediate portion of the fiber assembly 52Z is approximately equal to the longitudinal length of the fiber assembly 52Z. Disperse the superabsorbent polymer so that it is greater than the amount of superabsorbent polymer. Can be clothed. Such spraying can be achieved by the periodic change in the spraying amount of the superabsorbent polymer particles 54 described above.
- the density of the superabsorbent polymer in the center portion in the width direction of the fiber assembly 52Z can be made higher than the density on both sides in the width direction.
- the absorption speed at the center in the width direction of the fiber assembly 52Z is low, and the absorption speed at both sides in the width direction is high. Therefore, when used in an absorbent article, the liquid is absorbed by the absorbent body. It becomes easier to spread throughout, that is, the diffusibility is improved.
- the fiber assembly 52Z made of tow makes it easy for the liquid to flow along the continuous direction of the fibers. Therefore, by providing a portion with a relatively high fiber density and a portion with a low fiber density, special absorption characteristics are provided. Can be granted. Such a thing can be achieved by, for example, performing strong fiber opening partially during the production of the fiber assembly 52Z, or partially using a plurality of tows bundled together.
- the fiber density in the middle portion in the width direction of the fiber assembly 52Z made of tow may be higher than the fiber density in both sides in the width direction. This is a preferred form.
- the liquid easily flows along the continuous direction of the fibers, so that more liquid flows along the continuous direction of the fibers in the intermediate portion in the width direction of the fiber assembly 52Z.
- the superabsorbent polymer particles 54 are provided on the upstream side of the vacuum roll 106, and the superabsorbent polymer particles 54 are also added to the fiber assembly 52Z on the downstream side of the vacuum roll 106. Can also be given.
- the superabsorbent polymer particles 54 can be applied to both the upstream side and the downstream side of the vacuum roll 106 throughout the portion that becomes one absorber, and a part of the portion that becomes one absorber is also provided.
- the superabsorbent polymer particles 54 may be provided on the upstream side of the vacuum roll 106, and the superabsorbent polymer particles 54 may be provided on the downstream side of the vacuum roll 106 in other portions.
- Pants-type paper diapers (Examples and Comparative Examples) equipped with absorbent bodies manufactured using fiber assemblies obtained by opening cellulose diacetate fiber tows, general absorbents and products using short pulp fibers (conventional examples) ) was measured as follows. The results are shown in Tables 5 and 6.
- the basis weight of the superabsorbent polymer particles is as shown in Fig. 27, in which the area of the absorbent body in plan view is divided equally into three in the width direction and equally into three in the longitudinal direction. It is divided into a total of nine areas, and the weight of the superabsorbent polymer particles relative to the area of each area is the dispersion density.
- C is the amount of raw water absorbed (gZg)
- A is the weight of the gel remaining on the sieve (g)
- S is the weight of the sample (g).
- an acrylic resin cylinder 203 (with an inner diameter of 2 cm, a height of 5 cm, and a 75 m nylon net 201N attached to the bottom) is placed upright in the center of the upper and lower through holes in the center of the support base 201. Then, a sample 200 of 0.100 ⁇ 0.002 g is placed in the cylinder 203, and a cylindrical weight 202 (diameter 1.9 cm, weight 120 g) is placed on the sample 200.
- the absorption under pressure is calculated by the following formula.
- C absorption under pressure (mlZg)
- A scale value (ml) 30 minutes after the start of water absorption
- B scale value (ml) before water absorption
- S sample weight (g).
- C gel strength (Pa)
- A gel strength (dyneZcm 2 ) in which neo force-domainer force was also obtained, and 0.1: constant.
- U-shaped device that has a U-shaped plate shape that assumes the area extending from the crotch to the hip, and has an inlet formed in the center in the width direction at the lowest position.
- Inject artificial urine (as described above) lOOcc into the sample through the weight through-hole and the U-shaped device inlet, measure the time required to absorb the total amount, and use it as the absorption rate (seconds).
- L size dummy dolls (for men and women) are prepared, and in each of the supine and prone states, lOOcc artificial urine is injected at an injection rate of 12.5ccZ until leakage occurs. It was evaluated by the number of times it was turned over.
- Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Example 1 0 Conventional Example 1 Conventional Example 2 Covering Sheet Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Large hips Small hips Yes Yes
- Retaining sheet of Example 7 ; [Used non-woven fabric (50 gsm PE / PP 5.6 dtex crimped fiber length 51 thigh water repellent Fuku Co., Ltd.) (waistness B 0. 850 gfc m '/ cm)
- “Large waist” means that the waist is excessively large, and “small waist” means that the waist is excessively small.
- the present invention is suitable for the production of an absorbent body in an absorbent article such as an absorbent knot used together with a paper diaper, a sanitary napkin, an incontinence pad, and a diaper cover.
- FIG. 1 is a perspective view showing a pants-type diaper.
- FIG. 2 is a plan view showing a pants-type diaper in an unfolded state.
- FIG. 3 is a plan view showing the unfolded pants-type diaper.
- FIG. 4 is a cross-sectional view showing a first form of an absorbent body.
- FIG. 5 is a cross-sectional view showing a second embodiment of the absorber.
- FIG. 6 is a cross-sectional view showing a third embodiment of the absorber.
- FIG. 7 is a cross-sectional view showing a fourth embodiment of the absorber.
- FIG. 8 is a cross-sectional view showing a fifth embodiment of the absorber.
- FIG. 9 is a cross-sectional view showing a sixth embodiment of the absorber.
- FIG. 10 is a plan view showing a seventh embodiment of the absorber.
- FIG. 11 is a cross-sectional view showing a seventh embodiment of the absorber.
- FIG. 12 is a plan view showing a seventh embodiment of the absorber.
- FIG. 13 is a cross-sectional view showing a seventh embodiment of the absorber.
- FIG. 14 is a cross-sectional view showing a seventh embodiment of the absorber.
- FIG. 15 is a schematic view for explaining the direction of the absorber.
- FIG. 16 is a cross-sectional view showing an eighth embodiment of the absorber.
- FIG. 17 is a cross-sectional view showing a ninth embodiment of the absorber.
- FIG. 18 is a plan view schematically showing the arrangement of the absorber.
- FIG. 19 is a cross-sectional view showing another form of the absorber.
- FIG. 20 is a cross-sectional view showing another form of the absorbent body.
- FIG. 21 is a cross-sectional view showing another form of the absorber.
- FIG. 22 is a plan view showing the tape-type diaper in an unfolded state.
- FIG. 23 is a cross-sectional view taken along line 4-4 of FIG.
- FIG. 24 is a schematic diagram showing an example of manufacturing equipment for an absorber.
- FIG. 25 is a schematic diagram showing an example of a fiber opening device.
- FIG. 26 is a schematic view showing a dispersion form of superabsorbent polymer particles.
- FIG. 27 is a schematic view for explaining the direction of the absorber.
- FIG. 28 is an explanatory view showing a test apparatus.
- FIG. 29 is a cross-sectional view showing a conventional example.
- 10 Pants-type disposable diapers, 10A... Tape-type disposable diapers, 12... Exterior sheet, 12 ⁇ ⁇ Knock sheet, 20 ⁇ ... Absorber, 52 ⁇ “filament, 52 ⁇ ⁇ veil, 52 ⁇ ⁇ tow, 52 ⁇ ⁇ fiber assembly, 54 ⁇ superabsorbent polymer particles, 56 ⁇ Cover sheet, 60, 60 ⁇ ⁇ Barrier cuff, 64 ⁇ Barrier sheet, 70... Body fluid impermeable sheet, 72 ⁇ Second fluid impermeable sheet, 80... Retaining sheet, 130... Fasting pieces, E ... recesses, Z ... superabsorbent polymer particle spray zone.
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- Health & Medical Sciences (AREA)
- Epidemiology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Absorbent Articles And Supports Therefor (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/630,915 US7717150B2 (en) | 2004-06-28 | 2005-06-28 | Manufacturing facility of absorbent body, absorbent body and absorbent article |
EP05755712.6A EP1772126B1 (en) | 2004-06-28 | 2005-06-28 | Apparatus for producing absorbing material, absorbing material and absorbent article |
CN2005800217101A CN1976663B (zh) | 2004-06-28 | 2005-06-28 | 吸收体的制造设备 |
Applications Claiming Priority (10)
Application Number | Priority Date | Filing Date | Title |
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JP2004-190409 | 2004-06-28 | ||
JP2004190409A JP4477430B2 (ja) | 2004-06-28 | 2004-06-28 | 吸収体の製造設備および吸収体の製造方法 |
JP2004-340950 | 2004-11-25 | ||
JP2004340950A JP4549168B2 (ja) | 2004-11-25 | 2004-11-25 | 体液吸収性物品の吸収体の製造設備 |
JP2004-344715 | 2004-11-29 | ||
JP2004344715A JP4553700B2 (ja) | 2004-11-29 | 2004-11-29 | 吸収性物品及び吸収体の製造方法 |
JP2005-031662 | 2005-02-08 | ||
JP2005031662A JP4790281B2 (ja) | 2005-02-08 | 2005-02-08 | 吸収性物品 |
JP2005103856A JP4790296B2 (ja) | 2005-03-31 | 2005-03-31 | 吸収性物品 |
JP2005-103856 | 2005-03-31 |
Publications (1)
Publication Number | Publication Date |
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WO2006001456A1 true WO2006001456A1 (ja) | 2006-01-05 |
Family
ID=35781883
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/011861 WO2006001456A1 (ja) | 2004-06-28 | 2005-06-28 | 吸収体の製造設備、吸収体および吸収性物品 |
Country Status (3)
Country | Link |
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US (1) | US7717150B2 (ja) |
EP (1) | EP1772126B1 (ja) |
WO (1) | WO2006001456A1 (ja) |
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Also Published As
Publication number | Publication date |
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EP1772126B1 (en) | 2013-09-11 |
EP1772126A1 (en) | 2007-04-11 |
US7717150B2 (en) | 2010-05-18 |
EP1772126A4 (en) | 2010-11-24 |
US20080038504A1 (en) | 2008-02-14 |
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