JP6478185B2 - Method for manufacturing exterior body - Google Patents

Description

  The present invention relates to an exterior body and a method for manufacturing the exterior body, and more particularly, to an exterior body used for a disposable diaper and a method for manufacturing the exterior body.

Conventionally, an exterior body that supports an interior body having an absorbent body of a pants-type disposable diaper has been required to have a flexible and high tactile performance because it contacts the skin of the wearer.
As an exterior body having flexibility and high tactile performance, a plurality of elastic elastic members are arranged between two sheets, and the elastic elastic members are fixed on both sides in the width direction of the two sheets. An exterior body has been proposed in which a sheet and an elastic elastic member are fixed by bonding provided at a predetermined interval in the width direction. (Patent Document 1)

Japanese Patent Laid-Open No. 2005-080859

However, in the exterior body disclosed in Patent Document 1, when an SMS nonwoven fabric or SMMS nonwoven fabric having a high bending resistance is used for the sheet material, the top of the ridge formed on the outer surface of the sheet when the elastic elastic member contracts The curvature radius is small, and there is a risk of damaging the wearer's skin.
Then, the main subject of this invention is providing the exterior body with a large curvature radius of the top part of the collar formed on the outer surface of a sheet | seat at the time of shrinkage | contraction of an elastic elastic member, and its manufacturing method.

  The present invention that has solved the above problems is as follows.

The invention according to claim 1 is the manufacture of two sheets and an exterior sheet provided with a plurality of elastic elastic members extending in the width direction at predetermined intervals in the vertical direction between the two sheets. A method,
A plurality of elastic elastic members are provided on the inner surface of one side of the two sheets so as to extend in the width direction at a predetermined interval in the vertical direction, and the outer surface of the other side of the two sheets is provided. The elastic elastic member that is placed on the inner surface of the one side sheet, the one side sheet, the other side sheet, and both sides of the elastic elastic member are fixed to a fixing portion, and are adjacent to each other in the vertical direction. of the portion of the two sheets positioned in the middle portion in the vertical direction, to form a coupling portion extending in the width direction by the sealing means,
The coupling portion is provided at a predetermined interval in the width direction above a plurality of first coupling sites provided at a predetermined interval in the width direction and the first coupling sites adjacent in the width direction. A second binding site and a third binding site provided below the first binding site adjacent in the width direction at a predetermined interval in the width direction,
In the side view perpendicular to the width direction, the first binding site, the second binding site, and the third binding site are continuously formed in the width direction .

According to the first aspect of the present invention, a plurality of elastic elastic members are provided extending in the width direction at predetermined intervals in the vertical direction on the inner surface of one of the two sheets, and the two sheets The outer surface of the sheet on the other side of the sheet is placed on the inner surface of the sheet on the one side, and the one side sheet, the other side sheet, and both sides of the elastic elastic member are fixed to a fixing portion, Since a joining portion extending in the width direction is formed by the sealing means in the portion of the two sheets positioned in the middle portion in the vertical direction of the elastic elastic member adjacent in the vertical direction, the contraction force of the elastic elastic member is used. The exterior sheet | seat in which a collar is formed in the outer surface of two sheets and the curvature radius of the top part of a collar is formed large can be manufactured efficiently.
In addition, the coupling portion is provided at a predetermined interval in the width direction above a plurality of first coupling sites provided at predetermined intervals in the width direction and the first coupling sites adjacent in the width direction. The second coupling site is formed with a third coupling site provided at a predetermined interval in the width direction below the first coupling site adjacent in the width direction, and is viewed in a side view orthogonal to the width direction. Since the 1 binding site, the 2nd binding site, and the 3rd binding site are formed continuously in the width direction, wrinkles are formed on the outer surfaces of the two sheets by the contraction force of the elastic elastic member. The curvature radius of the top portion can be formed large, and an exterior body with high tactile sensation performance can be efficiently manufactured by reducing the foreign object sensation caused by the joint portion.

It is a perspective view of a pants type disposable diaper. It is the inner surface top view which developed the underpants type disposable diaper. It is the external surface top view which developed the underpants type disposable diaper. It is X1-X1 sectional drawing of FIG. It is X2-X2 sectional drawing of FIG. It is X3-X3 sectional drawing of FIG. It is the inner surface top view which carried out the cross section of some exterior bodies. It is explanatory drawing of the 1st manufacturing method of an exterior body. It is explanatory drawing of the 2nd manufacturing method of an exterior body. It is explanatory drawing of the 2nd manufacturing method of an exterior body. It is an inner surface figure of an exterior body.

<Pants-type disposable diapers>
In order to facilitate understanding of the exterior body 12 of the present invention, the pants-type disposable diaper 100 will be described in detail with reference to the accompanying drawings.
As shown in FIG. 1, a pants-type disposable diaper 100 is formed of an exterior body 12 that forms the outer surface of a product, and an interior body 200 that is attached to the inner surface of the exterior body 12.

(Interior body)
As shown in FIG. 2, the interior body 200 is formed in a rectangular shape in a plan view, but may be in an arbitrary shape. In this specification, the “front-rear direction” refers to the direction connecting the abdominal side and the back side, “width direction” refers to the direction orthogonal to the front-rear direction, and “up-down direction” refers to a pants-type disposable. The direction orthogonal to the waistline direction in the wearing state of the diaper 100 shall be said.

  As shown in FIG. 4, the interior body 200 includes a surface sheet 30 on the body side, the liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween. Moreover, in order to make the liquid which permeate | transmitted the surface sheet 30 transfer to the absorption element 50 rapidly, the intermediate sheet 40 is provided between the surface sheet 30 and the absorption element 50, and excrement is located on both sides of the interior body 200. In order to prevent leakage, solid gathers 60 standing on the body side are provided on both sides of the interior body 200. Note that the dotted pattern portions in FIG. 4 and the like indicate the joining portions where the constituent members are joined, and are formed by solid, bead, curtain, summit or spiral coating such as hot melt adhesive.

(Surface sheet)
The top sheet 30 has a property of transmitting liquid, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. Of these, the nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. For example, if the flexibility and drapeability are to be obtained, the spunbond method and the spunlace method are preferable processing methods, and if the bulkiness and softness are to be obtained, the air-through method, the point bond method, and the thermal bond method are preferable processing methods. .

(Intermediate sheet)
The intermediate sheet 40 can be exemplified by the same material as the top sheet 30, spunlace, spunbond, SMS, pulp nonwoven fabric, a mixed sheet of pulp and rayon, point bond, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably ^{20~80g / m 2, 25~60g / m} 2 is more preferable. The thickness of the raw fiber of the nonwoven fabric is preferably 2.2 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber. The basis weight is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 20 ± 5 ° C., relative humidity 65% or less) to obtain a constant weight. Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. A sample with a size of 200 mm × 250 mm (± 2 mm) is cut out from the test piece in a constant weight using a rice-basis plate (200 mm × 250 mm, ± 2 mm). Measure the weight of the sample, multiply it by 20, calculate the weight per square meter, and use it as the basis weight.

(Liquid impervious sheet)
The liquid-impermeable sheet 11 is not particularly limited. For example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric provided with a plastic film on the surface of the nonwoven fabric, or a nonwoven fabric on the plastic film. The laminated sheet etc. which overlap | superposed and joined etc. can be illustrated. For the liquid-impermeable sheet 11, it is preferable to use a liquid-impervious and moisture-permeable material that has been preferred in recent years from the viewpoint of preventing stuffiness. As a plastic film having moisture permeability, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction. Is widely used. In addition, non-woven fabric using micro-denier fibers, leakproof reinforcement by reducing the voids of the fibers by applying heat or pressure, and methods such as applying a superabsorbent resin or hydrophobic resin or water repellent Thus, a sheet that is liquid-impermeable without using a plastic film can also be used as the liquid-impermeable sheet 11.

(Three-dimensional gather)
The three-dimensional gather 60 folds a belt-like gather sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 and folds it into two in the width direction. A plurality of the elastic members 63 are fixed along the longitudinal direction at intervals in the width direction. An end portion of the three-dimensional gather 60 opposite to the folded portion in the width direction is an attachment portion 65 fixed to the back surface of the side edge portion of the interior body 200, and portions other than the attachment portion 65 protrude from the attachment portion 65. The protruding portion 66 is used.

The gather sheet 62 is made of a spunbond nonwoven fabric (SS, SSS, etc.), an SMS nonwoven fabric (SMS, SSMMS, etc.), a melt-blown nonwoven fabric excellent in uniformity and concealment, and water-repellent with silicon as necessary. A treated product can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m ² . As the elongated elastic elastic member 63, rubber thread or the like can be used. When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%. The term “elongation rate” means a value when the natural length is 100%.

  2-6 are preferable and, as for the number of the elongate elastic expansion-contraction members 63 provided in the free part of the three-dimensional gather 60, 3-5 are more preferable. A suitable arrangement interval is 3 to 10 mm. If comprised in this way, in the range which has arrange | positioned the elongate elastic expansion-contraction member 63, it will become easy to contact | abut with respect to skin. The elongated elastic elastic member 63 may be disposed not only at the distal end side but also at the base side.

(Absorption element)
The absorbent element 50 is formed of an absorbent body 56 and a packaging sheet 58 that wraps the absorbent body 56.

(Absorber)
The absorber 56 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber basis weight can be set to, for example, about 100 to 300 g / m ² when cotton-like pulp or short fibers are stacked, and in the case of a filament aggregate, for example, about 30 to 120 g / m ^2. Can do. The fineness in the case of a synthetic fiber is 1-16 dtex, for example, Preferably it is 1-10 dtex, More preferably, it is 1-5 dtex. In the case of a filament aggregate, the filament 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. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.

  As shown in FIG. 2, the absorber 56 is formed in a rectangular shape in a plan view, but may be in an arbitrary shape. For example, if the hourglass shape has a front end portion, a rear end portion, and a constricted portion that is narrower than the front end portion and the rear end portion, the absorbent body 56 itself and the three-dimensional gather 60 are formed. This is preferable because the fit to the legs is improved. Although it is formed in a rectangular shape in plan view, it can be formed in an arbitrary shape.

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the particle diameter of the superabsorbent polymer particles, those used in this type of absorbent article can be used as they are, and those having a particle size of 1000 μm or less, particularly 150 to 400 μm are desirable. The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. High-absorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and sodium carboxymethylcellulose crosslinks. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.

  As the superabsorbent polymer particles, those having a water absorption rate of 40 seconds or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversion in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur.

  Further, as the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. Thereby, even if it is a case where it is set as the bulky absorber 56, the sticky feeling after liquid absorption can be suppressed effectively. The gel strength is measured as follows. 49.0 g of artificial urine (urea: 20 wt%, salt: 8 wt%, calcium chloride dihydrate: 0.3 wt%, magnesium oxide heptahydrate: 0.8 wt%, pure water: 70.01 wt%), Add 1.0 g of superabsorbent polymer and stir with a stirrer. The produced gel is left in a constant temperature and humidity chamber of 40 ° C. × 60% RH for 3 hours and then returned to room temperature, and the gel strength is measured with a card meter (Curdmeter-MAX ME-500, manufactured by I.techno Engineering).

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the amount of polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. When it exceeds 350 g / m ² , the effect is saturated.

(Packaging sheet)
As the packaging sheet 58, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet having small holes, or the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material can be polypropylene, polyethylene / polypropylene composite material, or the like. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .

(Exterior body)
As shown in FIG. 3, the exterior body 12 is formed of a substantially rectangular back-side sheet 20 that covers the back body of the wearer and a substantially rectangular abdomen sheet 21 that covers the front body of the wearer. . By joining the both side portions 20A, 20A of the back side sheet 20 and the both side portions 21A, 21A of the ventral side sheet 21 by heat sealing, ultrasonic sealing, etc., as shown in FIG. A waist opening WO and a pair of left and right leg openings LO for passing the legs are formed.

  The length in the vertical direction of the dorsal seat 20 that covers the wearer's buttocks is longer than the length in the vertical direction of the ventral seat 21. Further, notches 22 and 22 formed in an arc shape toward the center in the width direction are formed at the lower portions of both side portions 20A and 20A of the back seat 20. Thereby, the Goagoa feeling of the site | part vicinity of the leg opening part LO of the pants type disposable diaper 100 which the wearer wore can be removed, and the appearance of the pants type disposable diaper 100 can be improved.

  The notch 22 is cut in a substantially arc shape from the starting point of the notch 22 located at the lower part of the side part 20 of the back seat 20 toward the center in the width direction, and then linearly toward the ventral direction. Notched in. Thereby, it can prevent that the interior body 200 is notched. In addition, there is no restriction | limiting in particular in the shape of the notch part 22, It may notch linearly toward the center part of the width direction from the starting point of the notch part 22 located in the lower part of the side part 20 of the back seat 20. it can.

  As shown in FIGS. 5 and 6, the back seat 20 is composed of a single sheet obtained by bending a first sheet (“sheet” in the claims) 20 </ b> B and a second sheet (“sheet” in the claims) 20 </ b> C at the rear. Is formed. Moreover, between the 1st sheet | seat 20B and the 2nd sheet | seat 20C, the waist edge elastic elastic member 17 arrange | positioned at the waist edge W, and the waist lower elastic elastic member arrange | positioned at the waist lower part U (" An elastic elastic member ") 15 and an intermediate elastic elastic member (" elastic elastic member "in the claims) 16 disposed at the portion where the notch 22 is formed are fixed.

The first sheet 20B has a thickness of about 0.16 mm and a weight per unit area of about 13 g obtained by laminating a spunbonded nonwoven fabric formed of a non-woven fabric made of polypyropyrene and a micro-woven fabric made of a microfiber non-woven fabric made of polypyropyrene. It is preferable to form an SMS nonwoven fabric or an SMMS nonwoven fabric with a / m ² , MD softness of about 42 mm and a CD softness of about 32 mm. Thereby, the collar 28 is formed in the inner surface of the 1st sheet | seat 20B with the shrinkage | contraction force of the waist edge elastic elastic member 17 grade | etc., And tactile-feel performance can be improved. The bending resistance is a measured value measured by a cantilever testing machine.

Similarly, the second sheet 20C is an SMS nonwoven fabric having a thickness of about 0.16 mm, a basis weight of about 13 g / m ² , a MD softness of about 42 mm, and a CD softness of about 32 mm. It is preferable to form with a nonwoven fabric. Thereby, the collar 28 is formed in the outer surface of the 2nd sheet | seat 20C by the contraction force of the waist edge elastic elastic member 17, etc., and tactile performance can be improved.

  The ventral sheet 21 is formed of a single sheet obtained by bending a first sheet (“sheet” in the claims) 21B and a second sheet (“sheet” in the claims) 21C at the front. Further, between the first sheet 21B and the second sheet 21C, the waist edge elastic elastic member 17 arranged at the waist edge W and the waist lower elastic elastic member 15 arranged at the waist lower part U are fixed. Yes.

The first sheet 21B is an SMS nonwoven fabric or an SMMS nonwoven fabric having a thickness of about 0.16 mm, a basis weight of about 13 g / m ² , a MD softness of about 42 mm, and a CD softness of about 32 mm. It is preferred to form. Thereby, the collar 28 is formed in the inner surface of the 1st sheet | seat 21B with the shrinkage | contraction force of the waist edge elastic elastic member 17 grade | etc., And tactile performance can be improved.

Similarly, the second sheet 21C is an SMS nonwoven fabric having a thickness of about 0.16 mm, a basis weight of about 13 g / m ² , a MD softness of about 42 mm, and a CD softness of about 32 mm. It is preferable to form with a nonwoven fabric. Thereby, the collar 28 is formed in the outer surface of the 2nd sheet | seat 21C with the shrinkage | contraction force of the waist edge elastic elastic member 17 grade | etc., And tactile-feel performance can be improved.

  The waist edge elastic elastic member 17 is extended along the width direction at a predetermined extension rate at a predetermined interval in the vertical direction so as to be continuous over the entire width direction in the vicinity of the waist opening WO. It is fixed in the state. The waist edge elastic elastic member 17 is fixed between the first sheet 20B and the second sheet 20C of the back sheet 20 over the entire width direction by an adhesive such as hot melt.

The waist edge elastic elastic member 17 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1. the rubber thread 0mm about ^2), 3 to 22 present approximately at intervals of 4 to 12 mm, respectively elongation from 150% to 400%, preferably fixed in particular about 220-320%. Note that several waist edge elastic elastic members 17 arranged on the inner body 200 side of the waist edge elastic elastic member 17 may be arranged so as to overlap the inner body 200.

  The waist lower elastic expansion / contraction member 15 is separated by a predetermined interval in the vertical direction so as to be continuous over the entire width direction at each part on both sides in the width direction except for the central portion in the width direction that overlaps the interior body 200. It is being fixed in the state extended | stretched along the width direction with the expansion | extension rate of. Note that one side in the width direction of the waist lower elastic elastic member 15 is back with an adhesive such as hot melt in the vicinity of the joint between the both side portions 20A, 20A of the back side sheet 20 and both side portions 21A, 21A of the abdominal side sheet 21. The side sheet 20 is fixed to the fixing part 24 between the first sheet 20B and the second sheet 20C, and the other side is a back sheet by an adhesive such as hot melt in the vicinity of the side part in the width direction of the absorbent element 50. It is being fixed to the fixing | fixed part 24 between the 20th 1st sheet | seat 20B and the 2nd sheet | seat 20C.

The waist lower elastic elastic member 15 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1. It is preferable to fix the thread rubber of about 0 mm ^{2 at} a spacing of 1 to 15 mm, particularly 3 to 8 mm, and an elongation rate of 200 to 350%, particularly about 240 to 300%.

  The middle elastic elastic member 16 is separated from each other on both sides in the width direction by a predetermined interval in the vertical direction so as to be continuous over the entire width direction, except for the central portion in the width direction, which overlaps the interior body 200, and It is fixed in a state of being stretched along the width direction at a predetermined stretch rate. Note that one side in the width direction of the middle elastic elastic member 16 is backed by an adhesive such as hot melt in the vicinity of the joint between the both side portions 20A, 20A of the back side sheet 20 and the both side portions 21A, 21A of the ventral side sheet 21. The side sheet 20 is fixed to the fixing part 24 between the first sheet 20B and the second sheet 20C, and the other side is a back sheet by an adhesive such as hot melt in the vicinity of the side part in the width direction of the absorbent element 50. It is being fixed to the fixing | fixed part 24 between the 20th 1st sheet | seat 20B and the 2nd sheet | seat 20C.

The intermediate elastic elastic member 16 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to 1. It is preferable to fix the thread rubber of about 0 mm ² ) at intervals of 5 to 40 mm, particularly 5 to 20 mm, and stretch ratios of 150 to 300%, particularly 180 to 260%, respectively.

<Method for manufacturing exterior body>
Next, a method for manufacturing the exterior body 12 will be described. In addition, since the manufacturing method of the back side sheet | seat 20 which forms the exterior body 12, and the manufacturing method of the abdominal side sheet | seat 21 are the same manufacturing methods, below, the back side sheet | seat 20 in which the some waist lower elastic elastic member 15 was provided is shown. The manufacturing method will be described as an example, and description of the manufacturing method of the ventral sheet 21 will be omitted.

  As shown in FIG. 7, between the outer surface of the first seat 20B of the back seat 20 and the inner surface of the second seat 20C, a plurality of waist lower elastic members extending in the left-right direction with a predetermined interval in the up-down direction. The elastic member 15 is clamped. One side in the left-right direction of the waist lower elastic elastic member 15 is formed by an adhesive such as hot melt in the vicinity of the joining portion 25 joined by heat sealing or the like on both sides of the first sheet 20B and the second sheet 20C. The other side is fixed to the fixing part 24 and is fixed to the fixing part 24 formed by an adhesive such as hot melt in the vicinity of the side part in the width direction of the absorbent element 50. On the other hand, the intermediate portion of the waist lower elastic elastic member 15, that is, the portion excluding both side portions, is not fixed to the outer surface of the first sheet 20B and the inner surface of the second sheet 20C, and can freely expand and contract in the left-right direction. it can. Further, in order to join the outer surface of the first sheet 20B and the inner surface of the second sheet 20C to the intermediate portion in the vertical direction between the waist lower elastic elastic member 15 adjacent to the waist lower elastic elastic member 15 in the vertical direction, A connecting portion 26 continuous in the left-right direction formed by heat sealing or ultrasonic sealing is provided. In addition, the left-right direction of FIG. 7 corresponds to the width direction mentioned above, and the up-down direction corresponds to the front-back direction mentioned above.

  As a result, as shown in FIG. 11, the substantially chevron shaped collar 28 in plan view formed on the inner surface of the first sheet 20 </ b> B forms a top portion 28 </ b> A of the collar 28 at a portion facing the waist lower elastic elastic member 15. A portion facing the coupling portion 26 provided adjacent in the vertical direction forms a base portion 28B of the flange 28.

(First manufacturing method)
Next, the first manufacturing method will be described. As shown in FIG. 8, the first manufacturing method is a joint formed continuously in the left-right direction at the center in the up-down direction between the waist lower elastic elastic members 15, 15 provided adjacent in the up-down direction. A portion 26 is formed to join the outer surface of the first sheet 20B and the inner surface of the second sheet 20C.

  The interval A between the waist lower elastic elastic members 15 and 15 adjacent in the vertical direction is preferably set to 5 to 10 mm. When the distance A is less than 5 mm, the size of the collar 28 formed by the contraction force of the lower waist elastic elastic member 15 is small, the volume of the space defined by the collar 28 is small, the cushion performance is small, and the mounting performance is deteriorated. In addition, there is a possibility that the efficiency of fixing both side portions of the waist lower elastic elastic member 15 with the fixing portion 24 may be reduced. On the other hand, when the distance A is greater than 10 mm, the ridges 28 formed by the contraction force of the waist lower elastic elastic member 15 are formed, for example, in a substantially chevron shape in the cross-sectional shape, and in a substantially bilateral shape in the cross-sectional shape. There is a possibility that the appearance performance is deteriorated due to the mixture of the shape formed. Moreover, in this embodiment, it manufactures by providing the space | interval A at 9 mm.

  The vertical width B of the coupling portion 26 is preferably set to 0.5 to 1.5 mm. When the vertical width B is less than 0.5 mm, there is a possibility that the base portion 28 </ b> B that becomes the rising start point of the flange 28 cannot be reliably fixed. On the other hand, when the vertical width B exceeds 1.5 mm, the feeling of foreign matter in the coupling portion 26 may increase and the tactile sensation performance may deteriorate. Further, in this embodiment, the vertical width B is set to 1.25 mm, and is set to about 14% with respect to the interval A. The vertical width B is preferably 10 to 15% with respect to the interval A. Accordingly, as shown in FIG. 11, the inner surface of the first sheet 20B and the outer surface of the second sheet 20C are caused to contract by the contraction force on the waist lower elastic elastic member 15 provided at a predetermined interval in the vertical direction. The back side sheet | seat 20 which 28 can be formed and can improve tactile performance can be manufactured.

(Second manufacturing method)
Next, the second manufacturing method will be described. A 2nd manufacturing method is a manufacturing method which reduces the area in the planar view of the coupling | bond part 26 in a 1st manufacturing method, reduces a foreign material feeling, and improves tactile-feel performance. As shown in FIG. 9, the second manufacturing method is formed at the center in the vertical direction between the waist lower elastic elastic members 15, 15 provided adjacent in the vertical direction with a predetermined interval in the horizontal direction. The connecting portion 26 formed substantially continuously in the left-right direction is formed to join the outer surface of the first sheet 20B and the inner surface of the second sheet 20C. In addition, the same code | symbol is attached | subjected to the same member as a 1st manufacturing method, and description is abbreviate | omitted.

  It is preferable that the left-right direction interval C2 between the binding sites 27, 27 adjacent in the left-right direction is set to 0.5 to 1.0 mm. When the distance C2 is less than 0.5 mm, the area of the coupling portion 27 forming the coupling portion 26 in the plan view cannot be reduced, and there is a possibility that the foreign object feeling cannot be eliminated. On the other hand, when the interval C2 is greater than 1.0 mm, the tops of the substantially chevron-shaped ridges 28 formed on the inner surface of the first sheet 20B and the substantially inverted chevron-shaped ridges 28 formed on the outer surface of the second sheet 20C. The curvature radius of 28A becomes small, and in particular, the skin of the wearer who comes into contact with the top portion 28A of the generally chevron-shaped ridge 28 formed on the inner surface of the first sheet 20B may be damaged. In the present embodiment, the distance C2 is set to 0.5 mm.

  The lateral width C1 of the plurality of coupling portions 27 provided at predetermined intervals in the left-right direction forming the coupling portion 26 may be longer than the lateral spacing C2, and there is no particular limitation. In the present embodiment, the gap C1 is manufactured with a distance of 1 mm, and the area of the coupling portion 26 in plan view of the second manufacturing method is approximately the area of the coupling portion 26 in plan view of the first manufacturing method. It is formed in 67%. As a result, a collar 28 is formed on the inner surface of the first sheet 20B and the outer surface of the second sheet 20C by the contraction force on the waist lower elastic elastic member 15 provided at a predetermined interval in the vertical direction, and the tactile sensation performance. Can be manufactured, and the back sheet 20 can be manufactured with reduced sensation of foreign matter caused by the heat-sealed portion.

(Third production method)
Next, the third manufacturing method will be described. The third manufacturing method further reduces the area of the coupling portion 26 in plan view in the second manufacturing method, further reduces the foreign object sensation and improves the tactile feel performance, and has a substantially chevron shape formed on the inner surface of the first sheet 20B. The shape of the substantially chevron-shaped ridges 28 formed on the inner surface of the first sheet 20B by increasing the radius of curvature of the top portion 28A of the substantially inverted chevron-shaped ridges 28 formed on the outer surface of the second sheet 20C. This is a manufacturing method in which the skin of the wearer in contact with the top portion 28A is prevented from being damaged. As shown in FIG. 10, in the third manufacturing method, in the vertical direction between the waist lower elastic elastic members 15 and 15 provided adjacent to each other in the vertical direction, the left and right direction in the side view orthogonal to the horizontal direction. The joint portion 26 formed continuously is joining the outer surface of the first sheet 20B and the inner surface of the second sheet 20C. In addition, the same code | symbol is attached | subjected to the same member as a 1st manufacturing method, and description is abbreviate | omitted.

  The coupling portion 26 is provided in a plurality of plan views provided with a predetermined spacing in the left-right direction and a first diamond-shaped coupling portion 29A having a substantially rhombus shape and a predetermined spacing in the left-right direction formed above the first coupling site 29A. In the plurality of planar views, the second coupling part 29B having an approximately isosceles triangular shape and the second coupling part 29B formed on the lower side of the first coupling part 29A and provided in the left-right direction at a predetermined distance are substantially two in plan view. It is formed from an equilateral triangular third binding site 29C. Further, the first binding site 29A and the second binding site 29B are formed continuously in the left-right direction in the side view, and similarly, the first binding site 29A and the third binding site 29C are in the left-right direction in the side view. It is formed continuously. Further, the second binding site 29B and the third binding site 29C are formed at symmetrical positions in the vertical direction about the first binding site 29A with a predetermined interval in the vertical direction. The three binding sites 29C are formed in the same shape.

  In the side view, the first binding site 29A, the second binding site 29B, and the third binding site 29C may be provided continuously. The first binding site 29A has a left-right width D1, a vertical width D2, and left and right The direction pitch D3 is not particularly limited. In the present embodiment, the left-right direction width D1 is 1.57 mm, the up-down direction width D2 is 0.7 mm, and the left-right direction pitch D3 is 2.8 mm, and the first coupling site 29A and the second coupling site 29B are provided. The distance F is approximately 0.67 mm, and similarly, the distance F between the first binding site 29A and the third binding site 29C is also approximately 0.67 mm.

  In the side view, the first binding site 29A, the second binding site 29B, and the third binding site 29C only have to be provided continuously, and the left and right width E1 of the second and third heat fusion sites 29B and 29C and the top and bottom There are no particular restrictions on the direction width E2 and the left-right direction pitch E3. In the present embodiment, the horizontal width E1 is set to 1.57 mm, the vertical width D2 is set to 0.35 mm, the horizontal pitch D3 is set to 2.8 mm, and the first binding site 29A and the second binding site 29B are provided. The distance F is approximately 0.67 mm, and similarly, the distance F between the first binding site 29A and the third binding site 29C is also approximately 0.67 mm.

  Thereby, the area of the coupling part 26 in plan view of the third manufacturing method is formed to be about 31% of the area of the coupling part 26 in plan view of the first manufacturing method. Further, similarly to the back sheet 20 manufactured by the first manufacturing method, a substantially chevron-shaped ridge 28 formed on the inner surface of the first sheet 20B and a substantially inverted chevron formed on the outer surface of the second sheet 20C. The radius of curvature of the top portion 28A of the heel 28 can be formed large, and the wearer's skin that comes into contact with the top portion 28A of the substantially chevron-shaped heel 28 formed on the inner surface of the first sheet 20B can be prevented from being damaged.

<Evaluation>
In order to evaluate the effects of the tactile sensation performance and the appearance performance of the exterior body 12 manufactured by the first to third manufacturing methods, 30 subjects were randomly extracted and subjected to sensory evaluation.

(Subject)
A pants-type disposable diaper 70 for reference, in which an interior body 200 is provided on an exterior body 12 that does not have a coupling portion 26 formed in an intermediate portion in the vertical direction, such as the waist lower elastic elastic members 15, 15 adjacent in the vertical direction, A first pant-type disposable diaper 71 manufactured by providing the interior body 200 on the exterior body 12 manufactured by the manufacturing method, and a second pant manufactured by providing the interior body 200 on the exterior body 12 manufactured by the second manufacturing method. A type disposable diaper 72 and a third pants-type disposable diaper 73 manufactured by providing the interior body 200 on the exterior body 12 manufactured by the third manufacturing method were manufactured.

(Evaluation method)
After the subject is wearing the reference pant-type disposable diaper 70, the subject is attached in the order of the first pant-type disposable diaper 71, the second pant-type disposable diaper 72, and the third pant-type disposable diaper 73, and the reference pant-type disposable When the level of the tactile sensation performance and appearance performance of the diaper 70 is set to 3, and the tactile sensation performance and appearance performance of the first pant type disposable diaper 71 are superior to the reference pant type disposable diaper 70, the level is 2 When the tactile sensation performance and the appearance performance of the first pants-type disposable diaper 71 and the like are extremely excellent, they were evaluated as level 1. On the other hand, if the tactile performance of the first pant type disposable diaper 71 and the appearance performance are inferior to the reference pant type disposable diaper 70, the level 4 is evaluated, and the tactile performance of the first pant type disposable diaper 71, When the appearance performance was extremely inferior, the level was evaluated as 5.

(result)
The level of the first pants type disposable diaper 71 has an average value of 2.2 and a standard deviation of 0.4, and the level of the second pants type disposable diaper 72 has an average value of 1.8 and a standard deviation of 0.4, The level of the third pants-type disposable diaper 73 was an average value of 1.5 and a standard deviation of 0.5.

<Explanation of terms in the specification>
When the following terms are used in the specification, they have the following meanings unless otherwise specified in the specification.
“Elongation rate” means a value when the natural length is 100%.
-"Gel strength" is measured as follows. 49.0 g of artificial urine (urea: 20 wt%, salt: 8 wt%, calcium chloride dihydrate: 0.3 wt%, magnesium oxide heptahydrate: 0.8 wt%, pure water: 70.01 wt%), Add 1.0 g of superabsorbent polymer and stir with a stirrer. The produced gel is left in a constant temperature and humidity chamber of 40 ° C. × 60% RH for 3 hours and then returned to room temperature, and the gel strength is measured with a card meter (Curdmeter-MAX ME-500, manufactured by I.techno Engineering).
・ "Weight" is measured as follows. After the sample or test piece has been pre-dried, it is left in a test room or apparatus in a standard state (test location is temperature 20 ± 5 ° C., relative humidity 65% or less) to obtain a constant weight. Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%. A sample with a size of 200 mm × 250 mm (± 2 mm) is cut out from the test piece in a constant weight using a rice-basis plate (200 mm × 250 mm, ± 2 mm). Measure the weight of the sample, multiply it by 20, calculate the weight per square meter, and use it as the basis weight.
-"Water absorption" is measured by JIS K7223-1996 "Test method for water absorption of superabsorbent resin".
・ "Water absorption rate" is "Time to end point" when JIS K7224-1996 "Water absorption rate test method for superabsorbent resin" is performed using 2 g of superabsorbent polymer and 50 g of physiological saline. And
・ If there is no description about the environmental conditions in the test and measurement, the test and measurement shall be performed in a test room or equipment in the standard condition (test location is temperature 20 ± 5 ℃, relative humidity 65% or less). .

  The manufacturing method of the exterior body of this invention can be used for the manufacturing method of the exterior body of a pants type disposable diaper and a tape type disposable diaper.

15 Elastic lower elastic member (elastic elastic member)
16 Middle elastic member (elastic member)
20B 1st sheet (sheet)
20C 2nd sheet (sheet)
21B 1st sheet (sheet)
21C 2nd sheet (sheet)
24 fixing portion 26 binding portion 27 binding site 29A first binding site 29B second binding site 29C third binding site

Claims (1)

A method of manufacturing an exterior sheet, wherein two sheets and a plurality of elastic elastic members are provided extending in the width direction with a predetermined interval in the vertical direction between the two sheets,
A plurality of elastic elastic members are provided extending in the width direction at predetermined intervals in the vertical direction on the inner surface of the sheet on one side of the two sheets,
The outer surface of the sheet on the other side of the two sheets is placed on the inner surface of the sheet on the one side, and the one side sheet, the other side sheet, and both sides of the elastic elastic member are fixed. Fixed to
Forming a coupling portion extending in the width direction by a sealing means at a portion of the two sheets located in the middle portion in the vertical direction of the elastic elastic member adjacent in the vertical direction ;
The coupling portion is provided at a predetermined interval in the width direction above a plurality of first coupling sites provided at a predetermined interval in the width direction and the first coupling sites adjacent in the width direction. A second binding site and a third binding site provided below the first binding site adjacent in the width direction at a predetermined interval in the width direction,
The manufacturing method of the exterior sheet | seat which the said 1st coupling | bond part, the said 2nd coupling | bonding part, and the said 3rd coupling | bond part form continuously in the width direction in the side view orthogonal to the width direction .

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