JP2016158799A - Underpants type absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underpants type absorbent article having side seal parts which can maintain firm bonding and can achieve the soft touch.SOLUTION: In an underpants type absorbent article, at least a part of an exterior body is formed of a stretchable sheet in which a stretchable film and a first non-woven web are laminated. The exterior body has side seal parts in which side end parts of a ventral area and side end parts of a back side area are disposed to face each other, and which has a plurality of joined junction parts. The plurality of junction parts are arranged in a row along a longitudinal direction of the underpants type absorbent article. A first junction part has a rectangular outer shape in which a short side and a long side adjacent to the short side are defined. The length of the short side is 0.05 mm or more and 1.5 mm or less. The length of the long side is 4.0 mm or more and 10.0 mm or less. A separation distance between the first junction part and a second junction part is 1.5 mm or more and 5.0 mm or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pants-type absorbent article.

  Conventionally, as shown in FIG. 5, the left and right ends of the exterior body in which the thread rubber 110 is disposed between a plurality of nonwoven fabrics are joined by heat sealing or ultrasonic sealing over a wide range of the ventral region and the back region. And the underpants type absorbent article 100 which formed the side seal part is known. A plurality of members constituting the pant-type absorbent article 100 are firmly joined, and this side seal part is not worn out when the pant-type absorbent article 100 is worn and the side seal part is not torn. The area is large and the density of the seal is high. And since the seal portion becomes hard, sealing the positions close to the left and right end portions of the exterior body may cause problems such as poor touch and a tendency to cause cutting failure of the side seal portion during manufacturing. .

  For example, as such a side seal part, in Patent Document 1, both side edges are intermittently ultrasonically joined along the longitudinal direction of the absorbent article, and both side edges are ultrasonically joined in a row. When the length in the longitudinal direction of the formed joints is T1, and the distance between adjacent joints in the longitudinal direction is T2, the value of T1 / (T1 + T2) is 0.1 or more and 0.35 or less. What is arranged in such a manner is disclosed.

  However, even if the side seal part proposed so far is applied to the pant-type absorbent article, it can be easily peeled when the pant-type absorbent article 100 is discarded, and the side seal part is firmly joined. At the same time, sufficient effects have not been obtained to achieve a soft touch.

JP2013-146549A

  Therefore, the object of the present invention has been made in view of such a problem, and the object is that it can be easily peeled when the pant-type absorbent article is discarded, and maintains a strong joint and is soft. It is providing the underpants type absorbent article which has a side seal part which can implement | achieve the touch.

(1) A pants-type absorbent article according to an embodiment of the present invention has an interior body including an absorbent member and a surface to which the interior body is fixed, and is disposed on the abdomen of the wearer when worn. A pants-type absorbent article comprising a region and a backside region defined to face the abdomen region, wherein the exterior body includes the abdomen region and the backside region, The stretchable sheet is formed of a stretchable sheet in which a stretchable film and a first nonwoven web are laminated, and the exterior body is disposed so that a side end portion of the abdominal region and a side end portion of the backside region face each other. And having a side seal portion including a plurality of joint portions including a first joint portion joined to the first joint portion and a second joint portion adjacent to the first joint portion. Are arranged in a row along the longitudinal direction of the pant-type absorbent article, The first joint has a rectangular outer shape in which a short side and a long side adjacent to the short side are defined, and the length of the short side is 0.05 mm or more and 1.5 mm or less, The length of the long side is 4.0 mm or more and 10.0 mm or less, and the separation distance between the first joint and the second joint is 1.5 mm or more and 5.0 mm or less. Features.
(2) A pant-type absorbent article according to another embodiment of the present invention is the pant-type absorbent article according to (1), wherein the length of the short side is 0.1 mm or greater and 1.0 mm or less. The length of the long side is 4.0 mm or greater and 8.0 mm or less, and the distance between the first joint and the second joint is 2.0 mm or greater and 4.0 mm or less. It is characterized by.
(3) A pant-type absorbent article according to another embodiment of the present invention is the pant-type absorbent article according to (1), wherein the length of the short side is 0.1 mm or more and 0.5 mm or less. The length of the long side is 4.0 mm to 6.0 mm, and the separation distance between the first joint and the second joint is 2.5 mm to 3.0 mm. It is characterized by.
(4) A pants-type absorbent article according to another embodiment of the present invention is the pants-type absorbent article according to any one of (1) to (3), wherein the first joint is curved in a concave shape. The side end of the abdominal region and the side end of the dorsal region are folded into one of the abdominal region and the dorsal region.

  The pant-type absorbent article according to an embodiment of the present invention can be easily peeled off when the pant-type absorbent article is discarded, and can maintain a strong joint and can realize a soft touch. Can be obtained.

It is the schematic which shows the underpants type absorbent article which concerns on embodiment of this invention. It is the elements on larger scale in the rectangular area enclosed with the dashed-dotted line part of FIG. FIG. 3 is a partially enlarged view of an elliptical region surrounded by a one-dot chain line portion in FIG. 2. The modification of the underpants type absorbent article which concerns on embodiment of this invention is shown, Comprising: It is the elements on larger scale in the rectangular area enclosed by the dashed-dotted line part of FIG. (A)-(c) It is process drawing explaining the manufacturing process of the underpants type absorbent article 1 which concerns on embodiment of this invention. It is the schematic which shows the conventional pants type absorbent article.

  With reference to FIG. 1 thru | or FIG. 3, the underpants type absorbent article which concerns on embodiment of this invention, and its manufacturing method are demonstrated in detail. In the description of the present embodiment, the same numbers are assigned to the same elements throughout. FIG. 1 is a schematic view showing a pant-type absorbent article 1 according to the present embodiment, FIG. 2 is a partially enlarged view of a rectangular region surrounded by a one-dot chain line portion of FIG. 1, and FIG. It is the elements on larger scale in the ellipse field surrounded by the dashed-dotted line part of two.

  In the description of the present specification, the longitudinal direction of the pant-type absorbent article 1 is a direction extending before and after the wearer when the pant-type absorbent article 1 is worn, and the short direction of the pant-type absorbent article 1 is Means a direction transverse or perpendicular to the longitudinal direction. Further, in the description of the present specification, the body fluid refers to a liquid discharged from the body such as urine, blood, and water in loose stool. Furthermore, in the description of the present specification, the inside of the pant-type absorbent article 1 is the skin contact surface side, which means the X side in FIG. The non-skin contact surface side is referred to as the Y side in FIG. And when the pants-type absorbent article 1 is worn, it means the pants-type absorbent article 1 is being worn. The pants-type absorbent article 1 of the present embodiment can be used as, for example, disposable diapers, pediatric training pants, incontinence articles, and female sanitary articles. Further, the non-woven web means a sheet-like one in which fibers are entangled without being woven.

  First, an embodiment of a pant-type absorbent article 1 according to the present invention will be described with reference to FIGS. 1 to 3. As shown in FIGS. 1 to 3, the pant-type absorbent article 1 includes an exterior body 10 in which a waist opening is defined, and an interior body 20 fixed to the surface of the exterior body 10 on the skin contact surface side. Prepare. And in the exterior body 10, the abdomen area | region 31 located in a wearer's abdomen, the back | dorsal area | region 32 located in a wearer's back | dorsal area, and the crotch area | region which couple | bonds the abdomen area | region 31 and the dorsal area | region 32 mutually. 33 is defined.

(Interior body)
The interior body 20 of the present embodiment includes at least an absorbing member and is disposed to absorb body fluid. The interior body 20 includes a liquid-permeable top sheet disposed on the skin contact surface side, a liquid-impermeable back sheet on the non-skin contact surface side disposed to face the top sheet, and a top sheet. And an absorbent member disposed between the back sheet. Thereby, the absorption member has a structure sandwiched between the top sheet and the back sheet. The interior body 20 is disposed at least on the crotch region 33 and inside the exterior body 10 and is fixed to the surface of the exterior body 10 by an adhesive such as hot melt, heat fusion, ultrasonic bonding, or the like. ing. The interior body 20 may be provided from the ventral region 31 to the back region 32.

The base material of the top sheet of this embodiment is only required to have liquid permeability so that body fluid moves to the absorbent member. For example, a nonwoven web such as a thermal bond nonwoven web, a thermal bond / spun bond, etc. It is formed from a material such as a laminated composite non-woven web, an open film such as an open polyethylene film, a foamed film such as polyethylene foam or urethane foam, or a composite sheet obtained by laminating these. The top sheet is preferably embossed or perforated on the surface in order to improve liquid permeability. The processing method can perform a well-known method without a restriction | limiting. In order to reduce irritation to the skin, the top sheet preferably contains a lotion, an antioxidant, an anti-inflammatory component, a pH adjuster, an antibacterial agent, a moisturizing agent and the like. Furthermore, from the viewpoint of strength and workability, the basis weight of the top sheet is preferably 14 g / m ² or more and 40 g / m ² or less. Although there is no restriction | limiting in particular as a shape of a top sheet, In order to guide body fluids, such as urine, to an absorption member, what is necessary is just a shape which covers an absorption member.

  In addition, it is preferable to provide the three-dimensional gather which prevents the leakage of a bodily fluid along the both-sides edge part of the longitudinal direction of the interior body 20 at the skin contact surface side of a top sheet. The outer end portion of the three-dimensional gather in the short direction of the interior body 20 is fixed to the back sheet, and the inner end portion of the three-dimensional gather in the short direction is fixed to the top sheet in the longitudinal direction front and rear parts. The central part is a free end that is not fixed to the top sheet, and is formed of a three-dimensional elastic member such as rubber thread and a sheet of non-woven web along the longitudinal direction of the interior body. However, it can be extended and contracted in accordance with the user's body shape.

  The base material of the backsheet of this embodiment may be any material that has liquid impermeability so that the body fluid retained by the absorbent member does not leak, such as a nonwoven web, a resin film, or a composite layered with these layers. It is formed from a material such as a sheet. The production method of the nonwoven web is not particularly limited. For example, a spunbond or meltblown nonwoven web, or a spunbond / meltblown, spunbond / meltblown / spunbond laminated nonwoven web, and these Composite materials are contemplated. Examples of the resin film include polyester, polyvinyl alcohol, polyethylene, polypropylene, and a composite film of polyethylene and polypropylene. Moreover, in order to prevent the stuffiness at the time of mounting | wearing, it is preferable that a back seat | sheet has moisture permeability. In order to provide moisture permeability, for example, a filler is blended in the resin film of the base material, and embossing for perforation is performed on the back sheet.

  The base material of the absorbent member of the present embodiment is not particularly limited as long as it is generally used for absorbent articles such as sanitary napkins, diapers, and urine pads. For example, fluff pulp, super absorbent resin (Super Absorbent) Polymer; hereinafter referred to as “SAP”), formed from a material such as a hydrophilic sheet. Examples of fluff pulp include those obtained by defibrating non-wood pulp such as wood pulp, synthetic fiber, and polymer fiber into a cotton shape. Examples of the highly water-absorbing resin include sodium polyacrylate resin, and examples of the hydrophilic sheet include tissue, absorbent paper, and hydrophilic nonwoven web.

  The absorbent member is configured as a single layer or a multilayer sheet using the above-described base material. Among these, those formed by mixing a hydrophilic fiber matrix of a fluff pulp web, such as a wood pulp fluff, with SAP particles are preferable. Further, in order to prevent leakage of SAP particles and stabilize the shape of the absorbing member, it is preferable to wrap the absorbing member in a hydrophilic sheet (not shown) such as tissue. Furthermore, it is preferable to emboss the surface of the absorbent member because it controls the diffusion of body fluid and easily deforms the absorbent member according to the body shape of the user.

(Exterior body)
The pants-type absorbent article 1 is formed by overlapping the ventral region 31 and the dorsal region 32 and fixing the side end portion 11a of the ventral region 31 and the side end portion 11b of the dorsal region 32 to each other. It has the exterior body 10 formed in a pants shape. Thereby, the waist opening W is defined in the exterior body 10. The ventral region 31 and the dorsal region 32 are composed of a stretchable sheet 12 in which at least one nonwoven web 14 and the stretchable film 15 are laminated to be stretchable. The stretchable sheet 12 may be a laminate of two or more non-woven webs 14 and stretchable films 15 each. The nonwoven web 14 and the stretchable film 15 are integrated by heat fusion or ultrasonic bonding. By configuring at least the ventral region 31 and the dorsal region 32 with the stretchable sheet 12 in the exterior body 10, a good fit can be given to the pant-type absorbent article 1.

  Preferably, the stretchable sheet 12 is stretchable sandwiched between at least the first nonwoven web 14 and the second nonwoven web 16 and the first nonwoven web 14 and the second nonwoven web 16. An elastic sheet 12 in which the film 15 is combined and integrated. For the sake of explanation, FIG. 3 shows these components slightly separated from each other. The stretchable sheet 12 having such a laminated structure of nonwoven web 14 / stretchable film 15 / nonwoven web 16 is a hot melt type in which each layer is combined and integrated by thermal fusion or ultrasonic bonding. It is preferable that they are combined and integrated without using such an adhesive. Thereby, the nonwoven webs 14 and 16 cover the stretchable film 15, and by reducing the thread rubber and the adhesive, it is possible to obtain a pant-type absorbent article having a good texture. Note that the entire surface of the stretchable film 15 may be covered with the nonwoven webs 14 and 16.

  As shown in FIG. 1, a waistband portion 13 is provided around the waist opening W in the pant-type absorbent article 1 of the present embodiment. An elastic elastic member such as rubber thread is disposed and fixed to the waistband portion 13. The elastic elastic member may be fixed to the elastic sheet 12 with an adhesive or the like.

  As shown in FIGS. 1 to 3, the side end portion 11 of the pant-type absorbent article 1 includes a side end portion 11 a which is a side end of the ventral region 31 and a side end portion 11 b which is a side end of the dorsal region 32. Are fixed to each other by side seal portions including a plurality of joint portions 18 formed by heat sealing, ultrasonic bonding, and pressing. That is, the stretchable sheets 12 positioned on the side end portion 11a and the side end portion 11b are overlapped and joined by heat sealing, ultrasonic processing, and pressing (embossing). In addition, the side edge part 11 may be formed so that fracture | rupture is possible so that it may be easy to remove the underpants type absorbent article 1 from a wearer. The plurality of joint portions 18 include a first joint portion 18a and a second joint portion 18b adjacent to the first joint portion 18a, and the plurality of joint portions 18 are arranged in the longitudinal direction of the pant-type absorbent article 1. It is arranged in a line along. And the 1st junction part 18a has the rectangular external shape in which the short side A and the long side B adjacent to the short side A are defined, The length L1 of the short side A is 0.05 mm or more 1 0.5 mm or less, the length L2 of the long side B is 4.0 mm or more and 10.0 mm or less, and the separation distance D between the first joint portion 18a and the second joint portion 18b is 1.5 mm or more. Provided to be 5.0 mm or less. As a result, the pant-type absorbent article 1 can easily peel the side seal portion when the pant-type absorbent article 1 is discarded, and can maintain a firm joint and realize a soft touch. Part can be obtained. In the first joint 18a of the pant-type absorbent article 1, the length L1 of the short side A is preferably 0.1 mm or more and 1.0 mm or less, and the length L2 of the long side B is 4 The distance between the first joint 18a and the second joint 18b is 2.0 mm or greater and 4.0 mm or less, more preferably the length of the short side A. L1 is not less than 0.1 mm and not more than 0.5 mm, and the length L2 of the long side B is not less than 4.0 mm and not more than 6.0 mm, and the first joint 18a and the second joint 18b are separated from each other. The distance is 2.5 mm or more and 3.0 mm or less. The length of the short side, the length of the long side, and the separation distance are preferably within the numerical range in all of the plurality of joint portions 18. The length of the short side A of the first joint portion 18a refers to the maximum length of the short side A of the first joint portion 18a, and the length of the long side B of the first joint portion 18a is the length of the first joint portion 18a. The maximum length of the long side B of the part 18a is referred to, and the separation distance D between the first joint part 18a and the second joint part 18b is between the first joint part 18a and the second joint part 18b. The distance of the non-joined part. In addition, the length L1 of the short side A of the 1st junction part 18a is an average value of the length of the short side of the some junction part 18, and the length L2 of the long side B of the 1st junction part 18a is the length L2 The average value of the lengths of the long sides B of the plurality of joints 18, and the distance D between the first joint 18 a and the second joint 18 b is the distance between the adjacent joints 18. The average value shall be taken.

  The exterior body 10 located in the crotch region 33 may be composed of the stretchable sheet 12 similarly to the portions located in the ventral region 31 and the dorsal region 32, or a non-stretchable sheet such as a nonwoven web is used. May be configured.

  The non-woven web 14 constituting the stretchable sheet 12 of the present embodiment is not particularly limited, and for example, spunbond, meltblown nonwoven web, or spunbond / meltblown, spunbond / meltblown / spunbond are laminated. Exemplified composite nonwoven webs and composite materials thereof are exemplified. The stretchable film 15 is not particularly limited as long as it has stretchability, and examples thereof include films formed from polyester elastomers, polyolefin elastomers, polyurethane resins, polyamide resins, and the like. Among these, a polyurethane resin film is preferable from the viewpoint of cost and stretchability.

  The elastic elastic member is configured to pull and hold the pant-type absorbent article 1 including the exterior body 10 with respect to the wearer's waist by fixing the elastic elastic member to the elastic sheet 12 in a stretched state. Is. The elastic elastic member may have any shape such as a thread shape, a strip shape, a waist belt shape, etc., but has an elongated shape, and is disposed elongated along the short direction rather than the longitudinal direction of the pant-type absorbent article. It controls the stretch characteristics of the absorbent article. As the elastic stretchable member, for example, any elastic shrinkable material such as one or a plurality of thread rubbers, a waist belt in which the thread rubbers are fixed to a nonwoven web, an elastomer film, an elastic foam material, and an elastomer cloth can be used.

The stretchable sheet 12 has an air permeability measured based on JIS L 1096-A (Fragile method): 1990 of 20 cm ³ / cm ² · sec or more in a non-stretched state. If the air permeability is less than 20 cm ³ / cm ² · sec, it becomes easy to get stuffy when worn. The air permeability can be freely determined by the thickness of the fibers and yarns of the nonwoven web 14 constituting the elastic sheet 12, the weaving density, the weight per unit area, the opening area ratio of the opening provided in the elastic sheet 12, and the like. Can be changed.

The stretchable sheet 12 has an air permeability measured based on JIS L 1096-A (Fragile method): 1990 of 50 cm ³ / cm ² · sec or more when stretched 150% in the stretch direction. Here, 150% stretched in the stretching direction is the ratio of the length after stretching to the natural length in the non-stretched state. That is, when the length Lb of the stretchable sheet 12 having a natural length La of 10 cm in the non-stretchable state stretched in the stretching direction is 15 cm, the stretched length is 15/10 × 100 = 150%. When the air permeability is less than 50 cm ³ / cm ² · sec, the portion used in the stretched state, for example, the portion around the buttocks is easily stuffy when worn.

  The stretch sheet 12 preferably has stretch properties in both the longitudinal direction and the short direction of the pants-type absorbent article 1. And as for the elastic sheet 12, it is preferable that the stretchability of the transversal direction of the pants type absorbent article 1 is larger than the stretchability of the pants type absorbent article 1 in the longitudinal direction.

  The pant-type absorbent article 1 may be provided with a pair of left and right leg gathers from the ventral region 31 through the crotch region 33 to the dorsal region 32. The leg gather is formed of, for example, an elastic member such as rubber thread and a sheet such as a nonwoven web. By providing the leg gathers, the fit at the part around the crotch is improved.

  A plurality of openings may be formed in the stretchable film 15. The plurality of openings are staggered in plan view in order to improve the air permeability in the outer package 10 of the pant-type absorbent article 1 and to alleviate the decrease in durability due to the opening of the stretchable film 15. It may be arranged. Moreover, the shape of these some opening part is not specifically limited, For example, a rectangle, an ellipse, a rhombus etc. may be sufficient.

  Next, an example of a method for producing the pant-type absorbent article 1 of the present embodiment will be described. First, as shown in FIG. 5, the elastic sheet 12 used for the pants-type absorbent article 1 according to the embodiment of the present invention is formed. Here, a method for forming the continuous body of the stretchable sheet 12 while conveying it in the longitudinal direction will be described. First, as shown in FIG. 5A, as a first step, a continuous body that becomes the stretchable film 15 is fed from the rotating roller 51, and a predetermined tension is applied to the continuous body that becomes the stretchable film 15. Stretch to. The predetermined tension refers to a state in which the stretchable film 15 is stretched by 200% or more, more preferably 250 ± 30%. In the second step, the continuum to be the nonwoven web 14 supplied from the rotating roller 52a and the continuum to be the nonwoven web 16 supplied from the rotating roller 52b become the stretchable film 15 in an expanded state. Laminate above and below the continuum. Next, in the third step, a seal line substantially continuous in the longitudinal direction perpendicular to the stretching direction is formed in the stretching direction in the continuous body that is the laminated stretchable film 15, nonwoven web 14, and nonwoven web 16. On the other hand, it is formed by heat-sealing or ultrasonic bonding over the entire region at intervals of 0.5 mm or more and 2.0 mm or less, and a continuous body consisting of the stretchable film 15, the nonwoven web 14, and the nonwoven web 16 is fixed. Thereby, the elastic sheet 12 is formed. Specifically, as shown in FIG. 5B, the laminated stretchable film 15, the nonwoven web 14, and the nonwoven web 16 are narrowed by the joining roller 53 and the other joining roller 54, and the joining roller 53 A contact line between the tip end portion 55 and the side surface 56 of the other joining roller 54 is heat-sealed or ultrasonically bonded to form a seal line. In this way, the sealing lines are formed at predetermined intervals, and the nonwoven web 14, the stretchable film 15, and the nonwoven web 16 are integrated, so that the surface of the stretchable sheet 12 is alleviated and smooth to the touch. It can be.

  The elastic sheet 12 has an arithmetic average roughness Ra of 600 μm or more and 1200 μm or less, a maximum cross-sectional height Rt of a roughness curve of 60 μm or more and 250 μm or less, and 600 μm at least on the non-skin contact surface side of the ventral region 31. As mentioned above, it is preferable to have the average length RSm of the roughness curve element of 8500 μm or less. The stretchable sheet 12 has an arithmetic average roughness Ra of 400 μm or more and 1000 μm or less and a maximum section height Rt of a roughness curve of 50 μm or more and 200 μm or less when stretched 150% in the stretch direction. Is preferred. Arithmetic average roughness Ra is based on JIS B 0601 (2001), and by making it into the above range, the surface does not become too flat, the surface is smooth, and the design is good. Moreover, the maximum cross-sectional height Rt of the roughness curve is based on JIS B 0601 (2001), and by setting the above range, the surface has an appropriate frictional force. Furthermore, the average length RSm of the roughness curve element is based on JIS B 0601 (2001), and by making it within the above range, a high-quality touch can be obtained. Therefore, the surface of the pants-type absorbent article 1 can have an appearance closer to that of underwear. When the pants-type absorbent article 1 is detached, the arithmetic average roughness Ra and the maximum cross-sectional height Rt of the roughness curve are set within the above ranges when stretched 150% in the stretching direction. Goodness can be given. The arithmetic average roughness Ra, the maximum cross-sectional height Rt of the roughness curve, and the average length RSm of the roughness curve element are, for example, a one-shot 3D measurement macroscope (trade name: VR-3100) manufactured by KEYENCE Inc. Can be measured.

  The stretchable sheet 12 has an elongation load of 0.8 N / 50 mm or more and 2.0 N / 50 mm or less when stretched 120% in the stretch direction, and 2.0 N / when stretched 150% in the stretch direction. It is preferable to have an extension load of 50 mm to 3.5 N / 50 mm. In addition, since the elongation rate changes depending on the wearer's body shape, 120% and 150% elongation loads were defined. By doing in this way, a difference in fit does not occur depending on the body shape. The stretchable sheet 12 preferably has an elongation of 30% or less when a load of 3.0 N / 50 mm is applied in a direction intersecting the stretchable direction. By doing in this way, since it does not expand | extend in directions other than an arrangement | positioning direction, it becomes easy to attach or detach the pants type absorbent article 1. In addition, the stretchable sheet 12 has a stretch rate in the stretch direction of 200% or more and 270% or less. For this reason, since expansion | swelling of 200% or more was attained compared with the past, the pants type absorbent article 1 which is easy to wear and can take off easily for a wearer can be provided. Here, the elongation rate in the expansion / contraction direction is the ratio of the length Lb after expansion in the expansion / contraction direction to the natural length La in the non-expansion / contraction state, as in the case of 120% expansion in the expansion / contraction direction. The extension load can be measured using, for example, an autograph manufactured by Shimadzu Corporation.

  The stretchable sheet 12 preferably has a breaking elongation of 210% or more and 280% or less in the stretching direction. Here, the elongation at break is the expansion and contraction in a specific direction (stretching direction), where La is the original length of the stretchable sheet 12 in the non-stretchable natural length and Lb is the length when stretched. The elongation rate (Lb / La × 100) when the sheet 12 is stretched and broken. By having the breaking elongation in this range, there is an effect that it becomes difficult to be stretched or torn even if the pants are widened greatly when attaching and detaching. The breaking elongation can be measured using, for example, an autograph manufactured by Shimadzu Corporation.

  Next, a step of cutting the stretchable sheet 12 into a pants shape, a step of fixing the interior body 20 to the skin contact surface side of the stretchable sheet 12, and a step of applying the waistband portion 13 to the stretchable sheet 12 It goes in random order. Thereafter, the stretchable sheet 12 is folded in half, and the portions that become the ventral region 31 and the dorsal region 32 of the exterior body 10 are opposed to each other, and the side end portion 11a of the ventral region 31 and the side end portion of the dorsal region 32 are arranged. A plurality of joint portions 18 are formed by squeezing 11b using an embossing roll and an anvil roll, and the side end portion 11 of the absorbent article is formed. At the time of pressing, at least one of heating or ultrasonic waves may be added.

  FIG. 4 shows a modification of the pant-type absorbent article 1 according to the present embodiment, and is a partially enlarged view in a rectangular region surrounded by a one-dot chain line portion in FIG. In this modification, the side end portion 11 of the pant-type absorbent article 1, that is, the side end portion 11 a of the ventral region 31 and the side end portion 11 b of the dorsal region 32 are the ventral region 31 or the dorsal region 32. It is folded toward either one side. This can be formed by bending a plurality of joints 18 in the longitudinal direction of the pant-type absorbent article 1 in a concave shape in the short direction of the pant-type absorbent article 1. Such folding is performed by, for example, applying heat from either the ventral region 31 or the dorsal region 32 to form the joint 18 when the stretchable sheet 12 is overlapped to form the joint 18. A concave curve can be formed in the stretchable sheet 12 on the side of the region 31 or the back region 32 by causing thermal contraction greater than the other. According to this, the joined portion 18 becomes inconspicuous due to the folded portion, and a good appearance can be obtained. In particular, by bending the joint portion 18 so that the edge portion 19 of the side end portion 11 abuts either one of the ventral region 31 or the dorsal region 32, the conspicuous edge portion 19 becomes inconspicuous, and is even better. Can be obtained. By these, the underpants type absorbent article 1 can make the emboss shape peculiar to an absorbent article inconspicuous, and can obtain a clean appearance.

  Next, the embodiments of the present invention will be described more specifically with reference to the following examples. In addition, this invention is not limited to description of a following example, unless the summary is exceeded.

A disposable diaper was used as the pant-type absorbent article. The inner body, air-through nonwoven 30 g / m ² as a topsheet, using a breathable polyethylene film 32 g / m ² as a backsheet, between the topsheet and the backsheet, fluff pulp 12g, polyacrylic acid resin An absorbent body composed of a mixture of 11 g of the water-absorbing polymer is disposed, and two 940 decitex urethane thread rubbers extending in the longitudinal direction on both sides of the short side of the interior body are disposed two by two, What was gathered under the suspension was used. As an exterior body, a 20 μm-thick urethane film having an opening ratio of 14% is laminated between two layers of 20 g / m ² polypropylene spunbonded nonwoven fabric in a stretched state of 250%, and the line extends in a direction perpendicular to the stretching direction. A laminate having stretchability and breathability is formed by ultrasonically bonding over the entire area in a pattern extending in a shape, forming a stretchable sheet, cutting the stretchable sheet into a pants shape, and 17 g / m ² at the end around the waist A composite in which six stretches of 1240 dtex urethane thread rubber stretched to 200% on polypropylene spunbond were arranged to form a waist gather, and the inner body was fixed inside. And the heat seal part which consists of a some junction part was formed by heat-squeezing the side edge part of an exterior body. What changed the short side length of this junction part, long side length, an area, and the space | interval between adjacent junction parts as Table 1 and Table 2 from Example 1 to Example 10 and Comparative Example 1 to Comparative Example It was set to 6.

[Evaluation method]
Evaluation of the side seal part which consists of a some junction part of Examples 1-10 and Comparative Examples 1-6 of the underpants type absorbent article was made into "the seal evaluation of a side edge part." As for the seal evaluation of the side end portion, a wearing test by 20 monitors was performed, and the average values of sensory evaluation regarding the side seal portion are shown in Tables 1 and 2.
(Seal strength)
The seal strength is 5 when the side seal part maintains sufficient strength even when spread when worn, 4 that maintains a little strength, 3 that cannot be said either, 2 that feels uneasy about strength when worn, The sensory evaluation which evaluates in five steps was performed by setting the thing torn at the time of wearing as 1.
(Beauty and feel)
The cosmetics and touch feeling of the side seal part consisting of a plurality of joint parts of the pants-type absorbent articles of Examples 1 to 10 and Comparative Examples 1 to 6 are determined, and 5 is excellent, and the one is slightly excellent 4. Sensory evaluation was performed in 5 stages, with 3 being inferior, 2 being slightly inferior, and 1 being inferior.
(Easy to break seal)
When taking off, when holding the vicinity of the side seal portion of the ventral region 31 with one hand and the vicinity of the side seal portion of the dorsal region 32 with the other hand, when applying force in the direction of peeling the side seal portion, Sensory evaluation was performed in 5 steps, with 5 being easy to break, 4 being easy to break, 3 being unable to be broken, 3 being slightly hard to break, and 1 being hard to break.

  As a result, the pants-type absorbent articles according to Examples 1 to 10 shown in Table 1 were compared with the pants-type absorbent articles according to Comparative Examples 1 to 6, and as a result, the short side of the first joint portion was obtained. The length L1 of A is 0.05 mm or more and 1.5 mm or less, and the length L2 of the long side B of the first joint portion is 4.0 mm or more and 10.0 mm or less. The separation distance D from the joint portion is set to 1.5 mm or more and 5.0 mm or less, so that the side seal portion can be easily peeled when the pant-type absorbent article is discarded, and the strong joint is maintained. It was found that a side seal portion that can realize a soft touch can be obtained. That is, if the length L1 of the short side A and the length L2 of the long side B of the joint portion constituting the side seal portion are longer than this, the side seal portion having a plurality of joint portions becomes hard, and the side seal after use If the length is shorter than this, the seal strength is lowered, and the side seal portion is likely to be cut poorly during production. And when the seal | sticker space | interval D was shorter than this, it became hard because the space | interval D between adjacent junction parts clogged, and when the space | interval D between joint parts was longer than this, it turned out that seal strength is insufficient. In the first joint 18a of the pant-type absorbent article 1, the length L1 of the short side A is preferably 0.1 mm or more and 1.0 mm or less, and the length L2 of the long side B is 4 0.0 mm or more and 8.0 mm or less, and the distance D between the first joint 18a and the second joint 18b is 2.0 mm or greater and 4.0 mm or less, and more preferably the length of the short side A The length L1 is not less than 0.1 mm and not more than 0.5 mm, the length L2 of the long side B is not less than 4.0 mm and not more than 6.0 mm, and the first joining portion 18a and the second joining portion 18b The separation distance D was found to be 2.5 mm or more and 3.0 mm or less.

  As mentioned above, although this invention was demonstrated using embodiment and an Example, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be made to the above embodiment. Further, it is apparent from the description of the scope of claims that embodiments with such changes or improvements can also be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Pants type absorbent article 10 Exterior body 11 Side end 12 Elastic sheet 13 Waist band part 14 First nonwoven web 15 Elastic film 16 Second nonwoven web 18 Multiple joints 18a First joint 18b Second joint 19 Edge 20 Interior body 31 Ventral region 32 Back region 33 Crotch region A Short side of first joint B Long side of first joint X Inside of pant-type absorbent article Y Outside of the pants-type absorbent article

Claims (4)

An interior body including an absorbing member, a surface to which the interior body is fixed, a ventral region disposed on a wearer's abdomen when worn, and a dorsal region disposed to face the ventral region A pants-type absorbent article comprising:
The exterior body is formed of an elastic sheet in which at least the ventral region and the dorsal region are laminated with an elastic film and a first nonwoven web,
The exterior body is adjacent to the first joint, and a first joint that is disposed so that a side end of the ventral region and a side end of the dorsal region face each other. A side seal portion including a plurality of joint portions including a second joint portion,
The plurality of joints are arranged in a row along the longitudinal direction of the pant-type absorbent article,
The first joint has a rectangular outer shape in which a short side and a long side adjacent to the short side are defined,
The length of the short side is not less than 0.05 mm and not more than 1.5 mm, the length of the long side is not less than 4.0 mm and not more than 10.0 mm, and the first joint and the second joint A pants-type absorbent article, wherein a distance from the part is 1.5 mm or more and 5.0 mm or less.   The length of the short side is not less than 0.1 mm and not more than 1.0 mm, the length of the long side is not less than 4.0 mm and not more than 8.0 mm, and the first joint and the second joint 2. The pant-type absorbent article according to claim 1, wherein a distance from the portion is 2.0 mm or greater and 4.0 mm or less.   The length of the short side is not less than 0.1 mm and not more than 0.5 mm, the length of the long side is not less than 4.0 mm and not more than 6.0 mm, and the first joint and the second joint 2. The pant-type absorbent article according to claim 1, wherein a distance from the part is 2.5 mm or more and 3.0 mm or less. The first joint is concavely curved;
The side end of the ventral region and the side end of the dorsal region are folded into one of the ventral region and the dorsal region. Item 4. The pant-type absorbent article according to any one of items 3 to 3.

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