JP6514744B2 - Absorbent article and method of manufacturing the same - Google Patents

Description

  The present invention relates to an absorbent article provided with a stretchable area having a design print portion and a method of manufacturing the same.

  In the case of absorbent articles, patterns for decoration (including pictures and one-point characters), methods of use and use assistance, indication of function such as size, or indication of mark such as manufacturer or product name, characteristic function etc. A design is printed (see, for example, Patent Documents 1 and 2).

  In the conventional design printing unit, in addition to printing on a material such as a non-woven fabric that constitutes the outer surface of the absorbent article, it is common to affix a printed sheet to the absorbent article.

  However, these conventional methods have a problem that the design is largely broken due to the expansion and contraction when applied to the expansion and contraction area, and they are not suitable for the expansion and contraction area. Another problem is that a high-class appearance such as fabric products can not be obtained. For example, if printing is performed on the material of the stretchable area, wrinkles and wrinkles will be formed on the printing material of the design in the natural length state, and the appearance will be lost.

Japanese Patent Application Publication No. 2015-515920 Patent 5695789 gazette Japanese Patent Publication No. 2004-532758 Japanese Patent Application Publication No. 2009-536845 JP, 2011-136095, A Patent No. 5250372 gazette

  Then, the main subject of this invention is providing the absorbent article which has a novel design printing part suitable for an expansion-contraction area | region.

The present invention which solved the above-mentioned subject is as follows.
< First aspect >
An elastic film is laminated between the first sheet layer and the second sheet layer, and the first sheet layer and the second sheet layer are directly or through the elastic film at a plurality of sheet junctions arranged at intervals. Equipped with elastic film expansion and contraction structure,
The area having the elastic film expansion and contraction structure has an expansion and contraction area expandable in one direction,
The stretchable region is contracted in the stretchable direction by the contraction force of the elastic film, and is stretchable in the stretchable direction.
The elastic limit elongation in the expansion and contraction direction of the expansion and contraction area is 200 to 295%,
A portion of the elastic film located in the stretchable area is provided with a design printing unit including at least one of a decorative pattern, a function indication, and a mark indication.
The elastic film has a width ratio of 20% or less in a direction orthogonal to the expansion and contraction direction.
An absorbent article characterized by the above.

(Action effect)
In the present absorbent article , an elastic film stretch structure is adopted, and a design print portion such as a pattern is provided in a portion located in the stretch region of the elastic film. Since the elastic film does not form wrinkles or wrinkles due to expansion and contraction, in the present absorbent article , the design is not broken due to the wrinkles or wrinkles being formed on the print target of the design. Moreover, in the present absorbent article , in addition to the advantage that it does not affect the stretchability of the stretchable area at all, the surface of the elastic film has the advantage of being superior in printability as compared with the non-woven fabric. There is also an advantage that the printing is difficult to peel off because it is covered with the sheet layer and the second sheet layer.
Further, when the elastic film is stretched in one direction, the width in the direction orthogonal to the stretching direction becomes narrower toward the center in the stretching direction according to the amount of stretching. This is called widening (or necking in). When the elastic film is shrunk to the natural length from this state, the width returns to its original size. The stretchable area in the absorbent article often varies in accordance with the position in the direction orthogonal to the stretch direction, so that the stretch amount in the stretch direction is fitted so as to fit the body surface composed of complex curved surfaces. The extent to which the width is entered also changes in accordance with the position in the direction orthogonal to the expansion and contraction direction. Therefore, when the design printing portion is provided on the elastic film in the portion positioned in the expansion and contraction area as in the present absorbent article , the elastic film is changed when the expansion amount in the expansion and contraction direction changes in accordance with the position in the direction orthogonal to the expansion and contraction direction. The amount of deformation of the design printing portion due to the width of the width also changes depending on the position in the direction orthogonal to the expansion and contraction direction, and the appearance may be deteriorated. Therefore, when providing a design printing part in an elastic film in the part located in an expansion-contraction area | region like this absorbent article , as described in this paragraph, width ratio is small, and it is desirable that it is 25% or less especially. In addition, the definition of the "width inclusion rate" is as described later.

<Second embodiment>
An elastic film is laminated between the first sheet layer and the second sheet layer, and the first sheet layer and the second sheet layer are directly or through the elastic film at a plurality of sheet junctions arranged at intervals. Equipped with elastic film expansion and contraction structure,
The area having the elastic film expansion and contraction structure has an expansion and contraction area expandable in one direction,
The stretchable region is contracted in the stretchable direction by the contraction force of the elastic film, and is stretchable in the stretchable direction.
A portion of the elastic film located in the stretchable area is provided with a design printing unit including at least one of a decorative pattern, a function indication, and a mark indication.
The elastic film has a width ratio of 25% or less in a direction orthogonal to the expansion and contraction direction,
The sheet bonding portion is a portion in which the first sheet layer and the second sheet layer are welded through a through hole that penetrates the elastic film, and the non-facing side of the first sheet layer and the second sheet layer It is a part where a recess is formed on the surface,
Either one of the first sheet layer and the second sheet layer is a shallow uneven layer having a shallower portion in the recess than the other,
The design print unit is provided on the surface of the elastic film on the small uneven layer side.
An absorbent article characterized in that.

(Action effect)
For example, when welding of the sheet bonding portion is performed by ultrasonic sealing, the concavities and convexities formed on the sheet layer on the anvil roll side are deeper, and the concavities on the opposite sheet layer are shallow. The same applies to heat sealing. In the present absorbent article , the sheet layer which is shallower in the recess is referred to as a small uneven layer. In the elastic film stretchable structure of the absorbent article , the design print portion on the elastic film will see through the first sheet layer or the second sheet layer to visually recognize the design print portion. Therefore, as described in this section, providing the design print portion on the side of the small concave / convex layer with smaller unevenness has an advantage that the appearance of the design print portion is better.

<Third embodiment>
An elastic film is laminated between the first sheet layer and the second sheet layer, and the first sheet layer and the second sheet layer are directly or through the elastic film at a plurality of sheet junctions arranged at intervals. Equipped with elastic film expansion and contraction structure,
The area having the elastic film expansion and contraction structure has an expansion and contraction area expandable in one direction,
The stretchable region is contracted in the stretchable direction by the contraction force of the elastic film, and is stretchable in the stretchable direction.
A portion of the elastic film located in the stretchable area is provided with a design printing unit including at least one of a decorative pattern, a function indication, and a mark indication.
The elastic film has a width ratio of 25% or less in a direction orthogonal to the expansion and contraction direction,
The elastic film stretch structure has a plurality of regions having different elastic limit elongations, and does not have the design print portion at the boundary of the plurality of regions in the elastic film and the portions adjacent to both sides thereof.
An absorbent article characterized in that.

(Action effect)
When providing a design printing part in an elastic film, a design printing part will deform | transform with expansion-contraction of an elastic film. In this case, if the entire design print unit is uniformly expanded and contracted, the shape of the design print unit is also uniformly deformed, so that the balance of the entire design print unit is not lost. However, the elastic film stretch structure is provided with a plurality of regions having different elastic limit elongations, and has an advantage that the fit property etc. can be changed according to the part. Thus, a plurality of regions having different elastic limit elongations In the case of providing a design printing portion that crosses the boundary of the region, the appearance may be deteriorated without uniform deformation on both sides of the boundary. Therefore, in the case where a plurality of regions having different elastic limit elongations are provided, it is also a preferable embodiment that the design printing portion is not provided at the boundary of the plurality of regions and the portions adjacent to both sides as described in this section. .

<Fourth embodiment>
An outer body constituting a front body and a rear body, an inner body including an absorber fixed to the outer body, and both sides of the outer body in the front body and both sides of the outer body in the rear body are respectively joined A pants-type disposable diaper comprising a side seal portion, an annular waist portion, a waist opening and a pair of left and right leg openings,
The outer covering body in at least one of the front body and the rear body covers the elastic film expansion / contraction structure over the width direction range corresponding to the space between the side seals in at least a part of the front / rear direction. Prepares to be in the width direction,
The absorbent article according to any one of the first to third aspects .

(Action effect)
The pants-type disposable diaper has a wide stretchable area among the absorbent articles and has many usage modes as an alternative to underwear. Therefore, it is often the case that a design printing part such as a pattern is provided in the stretchable area, and appearance is important It is a thing. Therefore, the absorbent article of the above-mentioned aspect is suitable for the elastic region of such a pants type disposable diaper.

<Fifth aspect of>
In a method of manufacturing an absorbent article provided with an elastic film elastic structure including an elastic region expandable in one direction,
The elastic limit elongation in the expansion and contraction direction of the expansion and contraction area is 200 to 295%,
The elastic film has a width ratio of 20% or less in a direction orthogonal to the expansion and contraction direction,
At the time of forming the elastic film stretch structure, a large number of places are arranged between the first sheet layer and the second sheet layer, with an elastic film being nipped and stretched in the stretch direction of the stretch region, spaced apart Bonding the first sheet layer and the second sheet layer directly or via the elastic film to form a sheet bonding portion;
As the elastic film, an elastic film on which a design printing portion including at least one of a pattern for decoration, a function indication and a mark indication is printed in advance in a portion to be the expansion and contraction area is used, or the elastic film is expanded Prior to printing a design printing portion including at least one of a decorative pattern, a function indication, and a mark indication on a portion to be the elastic region in the elastic film in line,
A manufacturing method of an absorbent article characterized by things.

(Action effect)
The absorbent article of the first aspect can be manufactured.

<A sixth aspect of>
In a method of manufacturing an absorbent article provided with an elastic film elastic structure including an elastic region expandable in one direction,
The elastic film has a width ratio of 25% or less in a direction orthogonal to the expansion and contraction direction,
At the time of forming the elastic film stretch structure, a large number of places are arranged between the first sheet layer and the second sheet layer, with an elastic film being nipped and stretched in the stretch direction of the stretch region, spaced apart Bonding the first sheet layer and the second sheet layer directly or via the elastic film to form a sheet bonding portion;
As the elastic film, an elastic film on which a design printing portion including at least one of a pattern for decoration, a function indication and a mark indication is printed in advance in a portion to be the expansion and contraction area is used, or the elastic film is expanded Prior to printing a design printing portion including at least one of a decorative pattern, a function indication, and a mark indication on a portion to be the elastic region in the elastic film in line,
When forming the elastic film stretch structure, the elastic film is stretched between the first sheet layer and the second sheet layer while being stretched in the stretch direction of the stretch region, and the elastic film, the first sheet layer, and The second sheet layer is passed between the anvil roll and the ultrasonic horn to apply an ultrasonic seal, and the first sheet layer and the second sheet layer are directly joined to form the sheet joint.
The elastic film is supplied so as to have the design printing portion on the surface of the elastic film opposite to the anvil roll side.
A method of producing an absorbent article, characterized in that

(Action effect)
The absorbent article of the second aspect can be manufactured. In particular, according to the present manufacturing method, the wrinkles formed in the first sheet layer and the second sheet layer in the stretchable area in the natural length state are neatly formed in the opposite sheet layer more orderly than the anvil roll side Therefore, in this respect as well, the design printing section looks better.

<Seventh aspect of>
In a method of manufacturing an absorbent article provided with an elastic film elastic structure including an elastic region expandable in one direction,
The elastic film has a width ratio of 25% or less in a direction orthogonal to the expansion and contraction direction,
At the time of forming the elastic film stretch structure, a large number of places are arranged between the first sheet layer and the second sheet layer, with an elastic film being nipped and stretched in the stretch direction of the stretch region, spaced apart Bonding the first sheet layer and the second sheet layer directly or via the elastic film to form a sheet bonding portion;
As the elastic film, an elastic film on which a design printing portion including at least one of a pattern for decoration, a function indication and a mark indication is printed in advance in a portion to be the expansion and contraction area is used, or the elastic film is expanded Prior to printing a design printing portion including at least one of a decorative pattern, a function indication, and a mark indication on a portion to be the elastic region in the elastic film in line,
When forming the elastic film expansion / contraction structure, a plurality of expansion / contraction regions having different elastic limit elongations are formed by differentiating the pattern of the sheet bonding portion,
While printing the design printing part on the part which becomes the above-mentioned a plurality of fields in the above-mentioned elastic film, in the printing,
Print a deformed design that has shrunk in the expansion / contraction direction with a high deformation rate in the region where the elastic limit elongation is smaller.
A method of producing an absorbent article, characterized in that

(Action effect)
When providing a design printing part in an elastic film, a design printing part will deform | transform with expansion-contraction of an elastic film. In this case, if the entire design print unit is uniformly expanded and contracted, the shape of the design print unit is also uniformly deformed, so that the balance of the entire design print unit is not lost. However, the elastic film stretch structure has a plurality of stretch zones having different elastic limit stretches by making the pattern of the sheet joint different, and has an advantage that the fit property or the stretch / non-stretch can be changed according to the part. There is. A plurality of regions having different elastic limit elongations are formed into sheet joints in the manufacturing process and then cut into individual products or parts, whereby the first sheet layer, the second sheet layer, and the elastic film between them are formed. It is formed by the difference in the amount of contraction and return of the elastic film after the tension applied to it is released. The amount of shrinkage return of the elastic film (including the non-stretched state that hardly shrinks) is lower than the elongation of the elastic film stretched before the formation of the sheet bonding portion, and the degree of reduction is changed by the pattern of the sheet bonding portion be able to. Therefore, when the design print portion is uniformly provided in the region to be a plurality of regions in the elastic film, the degree of deformation in the expansion / contraction direction of the design print portion is different in each region in the natural length state or wearing state. It will be worse.
On the other hand, as described in this section, the area where the elastic limit elongation is small, that is, the area where the amount of contraction return is small after the elastic film is extended to form the sheet joint, the contraction deformation in the expansion and contraction direction with a high deformation rate When the deformed design is printed, the difference in deformation in the expansion / contraction direction of the design print portion between the regions is reduced, and deterioration in appearance can be prevented. Here, the deformation rate means the ratio of the difference in length before and after shrinkage deformation to the length before shrinkage deformation as a percentage.

<Aspect of the eighth>
In a method of manufacturing an absorbent article provided with an elastic film elastic structure including an elastic region expandable in one direction,
The elastic film has a width ratio of 25% or less in a direction orthogonal to the expansion and contraction direction,
At the time of forming the elastic film stretch structure, a large number of places are arranged between the first sheet layer and the second sheet layer, with an elastic film being nipped and stretched in the stretch direction of the stretch region, spaced apart Bonding the first sheet layer and the second sheet layer directly or via the elastic film to form a sheet bonding portion;
As the elastic film, an elastic film on which a design printing portion including at least one of a pattern for decoration, a function indication and a mark indication is printed in advance in a portion to be the expansion and contraction area is used, or the elastic film is expanded Prior to printing a design printing portion including at least one of a decorative pattern, a function indication, and a mark indication on a portion to be the elastic region in the elastic film in line,
In forming the elastic film stretch structure, a plurality of regions having different elastic limit elongations in the product are formed;
Do not print a design printing portion on the boundary of the plurality of regions in the elastic film and the portion adjacent to the both sides thereof
The manufacturing method of the absorbent article as described above characterized by the above-mentioned.

(Action effect)
The absorbent article of the third aspect can be manufactured.

  As described above, according to the present invention, advantages such as an absorbent article having a novel design printing portion suitable for a stretchable area are provided.

It is a top view (inner surface side) of the underpants type disposable diaper of an unfolded state. It is a top view (outer surface side) of the underpants type disposable diaper of an unfolded state. It is a top view which shows only the principal part of the underpants type disposable diaper of an unfolded state. (A) is CC sectional drawing of FIG. 1, (b) is EE sectional drawing of FIG. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. (A) is a principal part top view of an elastic region, (b) is a DD sectional view of (a), (c) is a sectional view in a mounted state, (d) is a sectional view in a natural length state. It is a trace figure of the microscope picture from the (a) plane direction of the expansion-contraction area | region of a sample, (b) the trace figure of a high magnification microscope picture from a plane direction, (c) the trace figure of the high magnification microscope picture from oblique direction. (A) is a principal part top view of an elastic region, (b) is a DD sectional view of (a), (c) is a sectional view in a mounted state, (d) is a sectional view in a natural length state. It is a trace figure of the microscope picture from the (a) plane direction of the expansion-contraction area | region of a sample, (b) the trace figure of a high magnification microscope picture from a plane direction, (c) the trace figure of the high magnification microscope picture from oblique direction. (A) is a principal part top view of a non-stretching area, (b) is a DD sectional view of (a), (c) is a sectional view in a mounted state, (d) is a sectional view in a natural length state. FIG. 6 is a trace of a picture of the unstretched area of a sample. It is a principal part enlarged plan view of a non-stretching field. It is explanatory drawing which shows the change by expansion-contraction of an elastic film. It is a top view (outer surface side) of the underpants type disposable diaper of an unfolded state. (A) is CC sectional drawing of FIG. 15, (b) is EE sectional drawing of FIG. It is sectional drawing which shows roughly the principal part cross section of the exterior body expanded to a certain extent. It is sectional drawing which shows roughly the principal part cross section of the exterior body expanded to a certain extent. (A) It is a plane photograph of the sheet | seat junction part formed by the 1st welding form, (b) It is a plane photograph of the sheet | seat joint part formed by the 3rd welding form. It is the schematic of an ultrasonic sealing apparatus. It is a top view which shows the example of various arrangement | positioning of a sheet | seat junction part. It is explanatory drawing which shows the relationship between a printing pattern and a finish. It is explanatory drawing of width containing of an elastic film.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the attached drawings. In addition, the dotted part in sectional drawing has shown joining means, such as a hot-melt-adhesive agent.
1 to 6 show a pants-type disposable diaper. This pants-type disposable diaper (hereinafter, also simply referred to as a diaper) has an exterior body 20 forming a front body F and a back body B, and an interior body 10 fixed and integrated to the inner surface of the exterior body 20. The inner body 10 is formed by interposing the absorber 13 between the liquid-permeable top sheet 11 and the liquid-impermeable sheet 12. In manufacturing, after the back surface of the inner body 10 is joined to the inner surface (upper surface) of the outer body 20 by bonding means such as a hot melt adhesive, the inner body 10 and the outer body 20 are front body F and back body B Are folded at the center in the front-rear direction (longitudinal direction), which is the boundary between the two, and both sides are mutually joined by heat welding or a hot melt adhesive or the like to form side It becomes a pants type disposable diaper in which a leg opening was formed.

(Example of the structure of the interior body)
The inner body 10 has a structure in which an absorber 13 is interposed between a liquid-permeable top sheet 11 and a liquid-impermeable sheet 12 made of polyethylene or the like, as shown in FIGS. 4 to 6. It absorbs and holds the excretory fluid that has passed through the top sheet 11. The planar shape of the inner body 10 is not particularly limited, but generally it is generally rectangular as shown in FIG.

  As the liquid-permeable top sheet 11 that covers the front side (skin side) of the absorbent body 13, a non-porous or non-porous non-woven fabric, a porous plastic sheet, or the like is suitably used. The material fibers constituting the non-woven fabric may be synthetic fibers of olefin type such as polyethylene or polypropylene, polyester type, polyamide type etc., regenerated fibers such as rayon or cupra, natural fibers such as cotton, etc. Spunlace method Nonwoven fabrics obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a meltblown method, a needle punch method or the like can be used. Among these processing methods, the spunlace method is excellent in flexibility and drapability, and the thermal bonding method is excellent in bulk and softness. When a large number of through holes are formed in the liquid-permeable top sheet 11, urine and the like are quickly absorbed, and the dry touch property is excellent. The liquid-permeable top sheet 11 extends around the side edge of the absorber 13 to the back side of the absorber 13.

  As the liquid impermeable sheet 12 covering the back side (non-skin contact side) of the absorbent body 13, a liquid impermeable plastic sheet such as polyethylene or polypropylene is used, but in recent years, it has moisture permeability from the viewpoint of prevention of peeling. Is preferably used. This water-impervious and moisture-permeable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. is there.

  The absorbent 13 is a known one, for example, a pile of pulp fibers, an aggregate of filaments such as cellulose acetate, or a non-woven fabric, and is formed by mixing and fixing a superabsorbent polymer as necessary. Can be used. The absorbent body 13 can be packaged by a packaging sheet 14 having liquid permeability and liquid holding property, such as crepe paper, as necessary, for shape and polymer holding.

  The shape of the absorber 13 is formed in a substantially hourglass shape having a narrow portion 13N at the crotch portion which is narrower than the front and rear sides. The dimension of the constricted portion 13N can be determined as appropriate, but the longitudinal length of the constricted portion 13N can be about 20 to 50% of the total length of the diaper, and the width of the narrowest part is 40% of the total width of the absorbent 13 It can be about 60%. In the case of having such a constricted portion 13N, when the planar shape of the interior body 10 is substantially rectangular, the absorber 13 is not included in the portion corresponding to the constricted portion 13N of the absorber 13 in the interior body 10. An absorber side 17 is formed.

  On both sides of the interior body 10, solid gathers 90 fitted around the legs are formed. As shown in FIG. 5 and FIG. 6, this three-dimensional gather 90 has a fixing portion 91 fixed to the side of the back surface of the inner body 10, and 10 inner bodies through the side of the inner body 10 from the fixing portion 91. Between the main body portion 92 extending to the side of the surface of the body, a falling portion 93 formed by fixing the front and rear end portions of the main body portion 92 to the side of the surface of the interior body in a falling state, And a free portion 94 formed non-fixed. Each of these parts is formed of a gather sheet 95 formed by folding a sheet such as non-woven fabric into a double sheet. The gather sheet 95 is attached over the entire front-rear direction of the inner body 10, the falling portions 93 are provided on the front and back sides of the non-absorbent side 17 and the free portions 94 are on both sides of the non-absorbent side 17 It is extended.

  Further, between the double gather sheets 95, an elongated gather elastic member 96 is disposed at the tip of the free part or the like. The gather elastic member 96 is for forming the solid gather 90 by raising the free part 94 by an elastic contraction force as shown in FIG. 5 in the product state.

  The liquid impermeable sheet 12 is folded back on the both sides in the width direction of the absorber 13 together with the liquid permeable top sheet 11. As this liquid impermeable sheet 12, it is desirable to use an opaque sheet so as not to have brown color such as defecation and urine. As the opacification, a film formed by internally adding a pigment such as calcium carbonate, titanium oxide, zinc oxide, white carbon, clay, talc, barium sulfate or the like into a plastic and using it as a film is preferably used.

  As the gather elastic member 96, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicone, polyester and the like which are usually used can be used. Moreover, in order to make it hard to see from the outside, it is preferable to arrange the thickness at 925 dtex or less, the tension at 150 to 350%, and the interval at 7.0 mm or less. As the gather elastic member 96, in addition to a thread as shown in the illustrated embodiment, a tape-like member having a certain width can also be used.

  The material fibers constituting the above-mentioned gather sheet 95 are also synthetic fibers such as olefins, polyesters, and amides such as polyethylene or polypropylene, regenerated fibers such as rayon and cupra, and cotton, similarly to the liquid-permeable top sheet 11 Etc., and non-woven fabrics obtained by an appropriate processing method such as spun bond method, thermal bond method, meltblown method, needle punch method can be used, but in particular, in order to prevent moisture It is preferable to use a non-woven fabric having a low basis weight and excellent breathability. Furthermore, as for the gather sheet 95, silicone type, paraffin metal type, alkylchromic chloride type water repellent, etc. in order to prevent permeation of urine and the like, to prevent run-out and to improve the feel (dry feeling) to the skin. It is desirable to use a water repellent treated non-woven fabric coated with.

  As shown in FIG. 3, the inner surface of the inner body 10 is fixed to the inner surface of the outer body 20 by a hot melt adhesive or the like in the inner and outer fixing area 10 B (hatched area). The inner and outer fixation regions 10B extend from both the front and back sides of the non-absorbent side 17 with a width from one non-absorbent side 17 to the other non-absorbent side 17. The side edge of the inside and outside fixed area 10B is preferably located laterally from the middle in the width direction of the non-absorbent side 17 and, in particular, the exterior body over substantially the entire width of the interior 10 and substantially the entire front and rear. More preferably, it is fixed at 20.

(Front and back holding sheet)
As shown in FIGS. 1 and 4, in order to cover the front and rear end portions of the interior body 10 attached on the inner surface of the exterior body 20 and to prevent leakage from the front and rear edges of the interior body 10, 50, 60 may be provided. More specifically, the front pressing sheet 50 has a width direction from the inner surface of the folded portion 20C of the waist end area 23 of the inner surface of the outer body 20 of the front body F to a position overlapping with the front end of the inner body 10 The rear pressing sheet 60 extends in the width direction from the inner surface of the folded portion 20C of the waist end region 23 to the rear end portion of the inner body 10 in the inner surface of the outer body 20 of the back body B. It extends over the whole. If some non-adhered parts are provided on the crotch-side edge of the front and back pressing sheets 50 and 60 over the entire width (or only the central part), not only does the adhesive not stick out, but this part is slightly removed from the top sheet It can float and function as a leak barrier.

  When the front and rear pressing sheets 50 and 60 are separately attached as in the illustrated embodiment, there is an advantage that the degree of freedom in material selection is increased, but there are disadvantages such as an increase in materials and manufacturing processes. Therefore, it is possible to form a portion equivalent to the above-described pressing sheets 50 and 60 by extending a folded portion 20C formed by folding the exterior body 20 to the inner surface of the diaper to a portion overlapping the interior body 10.

(Example of structure of exterior body)
The exterior body 20 extends laterally from the side edge of the absorber 13. As shown in the illustrated embodiment, the outer edge of the outer body 20 may be located at the center in the width direction of the inner edge of the inner body 10 in the crotch, as in the illustrated embodiment, or may be located at the outer side in the width direction. Further, the exterior body 20 is a range in the front-rear direction between the waist T, which is a range in the front-rear direction corresponding to the side seal portion 21, and the waist T of the front body F and the waist T of the rear body B. And an intermediate portion L. And in the exterior body 20 of an illustration form, as the intermediate | middle direction L of the intermediate part L is remove | excluded, as FIG.2 and FIG.4-FIG. 6 shows, between the 1st sheet layer 20A and the 2nd sheet layer 20B. While the elastic film 30 is laminated, as shown in FIG. 7, the first sheet layer 20A and the second sheet layer 20B penetrate the elastic film 30 at a large number of sheet bonding portions 40 arranged at intervals. It has an elastic film stretch structure 20X joined through the through hole 31 and the stretch direction is the width direction. The first sheet layer 20A and the second sheet layer 20B may be indirectly joined via the elastic film 30, not through the through holes 31 of the elastic film 30. The planar shape of the exterior body 20 is formed by concave line around the leg 29 so that the widthwise side edges of the middle portion L respectively form a leg opening, and has a shape resembling an hourglass as a whole. The exterior body 20 may be formed separately in the front body F and the back body B, and may be arranged to be separated in the front-rear direction at the crotch.

  Although the form shown in FIG.1 and FIG.2 is a form by which elastic film elastic structure 20X is extended to the waist end area 23, when elastic film elastic structure 20X is used for the waist end area 23, a waist end If necessary, as shown in FIGS. 15 and 16, the waist end area 23 is not provided with the elastic film stretch structure 20X, as in the case where the tightening of the area 23 becomes insufficient. A telescopic structure by the member 24 can also be provided. However, the edge portion of the leg opening in the exterior body 20 is not provided with an elongated elastic stretchable member extending along the leg opening. The waist elastic member 24 is an elongated elastic member such as a plurality of thread rubbers arranged at intervals in the front-rear direction, and provides an expansion and contraction force to tighten the circumference of the trunk of the body. The waist elastic members 24 are not closely spaced and arranged substantially as a bundle, but are spaced at a distance of about 3 to 8 mm so as to form a predetermined stretch zone, preferably three or more. Five or more are arranged. Although the extension rate at the time of fixation of the waist part elastic member 24 can be determined suitably, in the case for normal adults, it can be made into about 230 to 320%. Although a rubber thread is used as the waist portion elastic member 24 in the illustrated example, for example, another elongated elastic member such as a plain rubber may be used.

  As another form, although not shown, the elastic film stretch structure 20X is not provided in the middle portion L between the waist T of the front body F and the waist T of the back body B, or the front body An expansion and contraction structure 20X is continuously provided in the back and forth direction from the inside of the waist T of F to the middle of the waist T of the back body B through the middle portion L, or elasticity is applied to only one of the front body F and the back body B Appropriate modifications such as provision of the film stretchable structure 20X are also possible.

  The shapes of the individual sheet bonding portions 40 and the through holes 31 in the natural length state can be determined as appropriate, but the shape is a perfect circle (see FIGS. 7 and 8), an oval, a triangle, and a rectangle (see FIGS. 9 to 12). ), Polygons such as rhombus (see FIG. 13 (b)) or convex lens (see FIG. 13 (a)), concave lens (see FIG. 13 (c)), stars, clouds, etc. be able to. The dimensions of individual sheet joints are not particularly limited, but the maximum length is preferably 0.5 to 3.0 mm, particularly preferably 0.7 to 1.1 mm, and the maximum width 40x is 0.1 to 3.0 mm In particular, in the case of a long shape in a direction orthogonal to the expansion and contraction direction, it is preferable to set it to 0.1 to 1.1 mm.

The size of each sheet bonding portion 40 may be appropriately determined, but if the size is too large, the hardness of the sheet bonding portion 40 has a large influence on the feel, and if it is too small, the bonding area is small and the materials are sufficiently adhered. In general, the area of each sheet bonding portion 40 is preferably about 0.14 to 3.5 mm ² because it can not be done. The area of the openings of the individual through holes 31 is preferably 1 to 1.5 times the area of the sheet joint, although the area of the openings of the individual through holes 31 may be equal to or larger than the sheet joint because the sheet joint is formed Is preferred. The area of the opening of the through hole 31 is not the state of the elastic film 30 alone, but a value in the state of being integrated with the first sheet layer 20A and the second sheet layer 20B and in the state of natural length. When the area of the opening 31 is not uniform in the thickness direction, for example, the front and back of the elastic film 30 are different, this means the minimum value.

  The planar arrangement of the sheet bonding portion 40 and the through holes 31 can be determined as appropriate, but a planar arrangement which is regularly repeated is preferable, and an oblique lattice shape as shown in FIG. 21 (a) or FIG. 21 (b) Hexagonal grid as shown (these are also referred to as zigzag), square grid as shown in FIG. 21 (c), rectangular grid as shown in FIG. 21 (d), as shown in FIG. 21 (e) Parallel lattice (in which two groups are provided so that a group of many parallel oblique rows intersect each other as shown) or the like (these are inclined at an angle of less than 90 degrees with respect to the expansion and contraction direction) And the group of sheet bonding portions 40 (the arrangement of group units may be regular or irregular, and may be a pattern, characters, etc.) are regularly repeated. You can also

  When the first sheet layer 20A and the second sheet layer 20B in the sheet bonding portion 40 are bonded through the through holes 31 formed in the elastic film 30, at least the first sheet layer 20A and the second sheet layer 20 in the sheet bonding portion 40. It is desirable that the first sheet layer 20A and the second sheet layer 20B are not joined to the elastic film 30 except between the sheet layers 20B.

  The means for bonding the first sheet layer 20A and the second sheet layer 20B in the sheet bonding portion 40 is not particularly limited. For example, the first sheet layer 20A and the second sheet layer 20B in the sheet bonding portion 40 may be bonded by a hot melt adhesive or by bonding means such as heat sealing or ultrasonic sealing. .

  When the first sheet layer 20A and the second sheet layer 20B are bonded through the through holes 31 of the elastic film 30 in the sheet bonding portion 40, the form in which the sheet bonding portion 40 is formed by material welding is the first form in the sheet bonding portion 40. A first welding mode in which the first sheet layer 20A and the second sheet layer 20B are joined only by the molten solidified material 20m of at least one of the one sheet layer 20A and the second sheet layer 20B (FIG. 17 (a 17), the second welding mode in which the first sheet layer 20A and the second sheet layer 20B are joined only by the whole or most or a part of the solidified portion 30m of the elastic film 30 in the sheet joining portion 40 (see FIG. b) or the third welding mode (see FIG. 17 (c)) in which both of them are combined, but the second and third welding modes are preferable. Arbitrariness. Particularly preferable is the first sheet layer by 20 m of the solidified part of the first sheet layer 20 A and the second sheet layer 20 B and 30 m of the solidified part of all or most of the elastic film 30 in the sheet bonding portion 40. It is a form by which 20A and the 2nd sheet layer 20B are joined. In the third welding mode shown in FIG. 19 (b), the elastic film 30 is reflected in white between the fiber-solidified matter 20m of the first sheet layer 20A or the second sheet layer 20B appearing in black. In the first welding mode shown in FIG. 19 (a), 30 m of the solidified melt is observed, and in the first welding form shown in FIG. 19, the elastic film melts and solidifies between 20 m of the melted and solidified fiber sheet of the first sheet layer 20A or Nothing is seen (the white part is the boundary of the fiber-solidified matter 20 m and the diffuse reflection of the fiber-solidified matter 20 m).

  As in the first and third bonding modes, the first sheet layer 20A and the second sheet layer 20A with the molten solidified material 20m of at least one of the first sheet layer 20A and the second sheet layer 20B as an adhesive. When joining the sheet layer 20B, it is preferable not to melt part of the first sheet layer 20A and the second sheet layer 20B because the sheet bonding portion 40 is not hardened. In addition, when the first sheet layer 20A and the second sheet layer 20B are non-woven fabrics, the core of all the fibers of the sheet bonding portion 40 is that the first sheet layer 20A and the second sheet layer 20B are not partially melted. In the composite fiber, not only the core but also the central part of the monocomponent fiber remains, but its surrounding part (including not only the sheath of the composite fiber but also the part on the surface side of the monocomponent fiber) The fibers are not melted at all, but the remaining fibers are all melted or the core remains, but the surrounding portion includes a melted form.

  When the first sheet layer 20A and the second sheet layer 20B are joined using the melted and solidified product 30m of the elastic film 30 as an adhesive as in the second welding mode and the third welding mode, the peel strength is high. In the second welding mode, the first sheet layer 20A is formed under the condition that the melting point of at least one of the first sheet layer 20A and the second sheet layer 20B is higher than the melting point of the elastic film 30 and the heating temperature at the time of forming the sheet bonding portion 40. The elastic film 30 is sandwiched between the second sheet layer 20B, and a portion to be the sheet bonding portion 40 is pressurized and heated, and only the elastic film 30 is melted. On the other hand, in the third welding mode, under the condition that the melting point of at least one of the first sheet layer 20A and the second sheet layer 20B is higher than the melting point of the elastic film 30, between the first sheet layer 20A and the second sheet layer 20B It can be manufactured by sandwiching the elastic film 30, pressing and heating a portion to be the sheet bonding portion 40, and melting the elastic film 30 with at least one of the first sheet layer 20A and the second sheet layer 20B. From such a viewpoint, the melting point of the elastic film 30 is preferably about 80 to 145 ° C., and the melting points of the first sheet layer 20A and the second sheet layer 20B are about 85 to 190 ° C., particularly about 150 to 190 ° C. The difference between the melting point of the first sheet layer 20A and the second sheet layer 20B and the melting point of the elastic film 30 is preferably about 60 to 90.degree. Moreover, it is preferable to make heating temperature into about 100-150 degreeC.

  In the second welding mode and the third welding mode, when the first sheet layer 20A and the second sheet layer 20B are non-woven fabrics, the melted and solidified material 30m of the elastic film 30 is a sheet bonding portion as shown in FIG. 40 may penetrate between the fibers all over the thickness direction of the first sheet layer 20A and the second sheet layer 20B in 40, but as shown in FIGS. 17 (b) and (c) and FIG. The flexibility of the sheet bonding portion 40 is higher in the mode in which the fibers are penetrated between the fibers or in the mode in which the fibers of the first sheet layer 20A and the second sheet layer 20B hardly penetrate as shown in FIG. It becomes a thing.

  FIG. 20 shows an example of an ultrasonic sealing device suitable for forming the second welding mode and the third welding mode. In this ultrasonic sealing device, when forming the sheet bonding portion 40, the first sheet layer 20A, between the anvil roll 60 having the projections 60a formed in the pattern of the sheet bonding portion 40 on the outer surface, and the ultrasonic horn 61, The elastic film 30 and the second sheet layer 20B are fed. At this time, for example, the feed drive roll 63 and the nip roll 62 are set by making the feed transfer speed by the feed drive roll 63 and the nip roll 62 of the elastic film 30 on the upstream side slower than the transfer speeds of the anvil roll 60 and the ultrasonic horn 61 and thereafter. The elastic film 30 is stretched in the MD direction (machine direction, flow direction) to a predetermined elongation rate in a path from the nip position by the to the seal position by the anvil roll 60 and the ultrasonic horn 61. The elongation rate of the elastic film 30 can be set by selecting the speed difference between the anvil roll 60 and the feed drive roll 63, and can be set, for example, to about 300% to 500%. 62 is a nip roll. The first sheet layer 20A, the elastic film 30, and the second sheet layer 20B, which are fed between the anvil roll 60 and the ultrasonic horn 61, are laminated in this order with the protrusion 60a and the ultrasonic horn 61. Heating is performed by the ultrasonic vibration energy of the ultrasonic horn 61 while pressing between them to melt only the elastic film 30 or melt at least one of the first sheet layer 20A and the second sheet layer 20B and the elastic film 30. At the same time as forming the through holes 31 in the elastic film 30, the first sheet layer 20A and the second sheet layer 20B are joined through the through holes 31 at the same time. Therefore, in this case, the area ratio of the sheet bonding portion 40 is selected by selecting the size, shape, separation distance, arrangement pattern of the roll length direction and roll circumferential direction, and the like of the projection 60 a of the anvil roll 60. Can.

  The reason why the through hole 31 is formed is not necessarily clear, but it is considered that the portion of the elastic film 30 corresponding to the projection 60 a of the anvil roll 60 is melted and separated from the periphery to open the hole. At this time, in the elastic film 30, the portions between the adjacent through holes 31 aligned in the expansion and contraction direction are expanded and contracted by the through holes 31 as shown in FIGS. 7A, 9A, and 11A. Since it is cut from both sides and loses the support on both sides in the contraction direction, the center side in the expansion and contraction direction is balanced toward the center in the direction orthogonal to the expansion and contraction direction, as long as continuity in the direction orthogonal to the contraction direction can be maintained. The through hole 31 is contracted and expanded in the expansion and contraction direction. Then, as shown in FIG. 7A and FIG. 9A, when the sheet bonding portion 40 is formed in a pattern in which a portion where the elastic film 30 linearly continues along the expansion and contraction direction is left as in the expansion and contraction region 80 described later. Thus, when contracting to a natural length state by cutting into individual products, etc., the length in the expansion and contraction direction of the enlarged portion of the through hole 31 forms a gap between the through hole 31 and the sheet bonding portion 40 It will contract until it disappears. On the other hand, as shown in FIG. 11A, when the sheet bonding portion 40 is formed in such a pattern that there is no portion where the elastic film 30 linearly continues along the expansion / contraction direction like the non-expansion / contraction region 70 described later. When it shrinks to a natural length state due to cutting into a product or the like, it hardly shrinks, so a large gap is left between the through hole 31 and the sheet bonding portion 40.

The constituent materials of the first sheet layer 20A and the second sheet layer 20B are sheet-like ones, and they can be used without particular limitation as long as they allow the design print portion of the elastic film to be described later to be visible from the outside. It is preferable to use a non-woven fabric from the viewpoint of the properties. The non-woven fabric is not particularly limited as to its raw material fiber. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, regenerated fibers such as rayon and cupra, natural fibers such as cotton, etc., mixed fibers of which two or more are used, composite fibers Etc. can be illustrated. Furthermore, the non-woven fabric may be produced by any processing. Examples of the processing method include known methods such as spun lace method, spun bond method, thermal bond method, melt blown method, needle punch method, air through method, point bond method and the like. When using a non-woven fabric, the fabric weight is preferably about 12 to ²⁰ g / m ² . In addition, a part or all of the first sheet layer 20A and the second sheet layer 20B may be a pair of layers in which one sheet of material is folded back to be opposed. For example, as in the illustrated embodiment, in the waist end area 23, the component positioned on the outside is the second sheet layer 20B, and a folded portion 20C formed by being folded back to the inner surface at the waist opening edge is the first sheet layer 20A. The elastic film 30 is interposed between them, and in the other parts, the component positioned inside is the first sheet layer 20A, and the component positioned outside is the second sheet layer 20B, and the elastic film 30 is interposed therebetween. Can be intervened. Of course, the constituent of the first sheet layer 20A and the constituent of the second sheet layer 20B are individually provided over the entire front-rear direction, and the constituent of the first sheet layer 20A and the second sheet layer are not folded. The elastic film 30 can also be interposed between the components of 20B.

  The elastic film 30 is not particularly limited, and as long as it is a thermoplastic resin film having elasticity by itself, in addition to non-porous ones, those in which a large number of holes and slits are formed for ventilation can also be used. . In particular, the tensile strength in the width direction (stretching direction, MD direction) is 8 to 25 N / 35 mm, the tensile strength in the front-rear direction (direction orthogonal to the stretching direction, CD direction) is 5 to 20 N / 35 mm, the tensile elongation in the width direction The elastic film 30 is preferably 450 to 1050%, and the tensile elongation in the front-rear direction is 450 to 1400%. The thickness of the elastic film 30 is not particularly limited, but preferably about 20 to 40 μm.

(Stretch area)
The area | region which has the elastic film expansion-contraction structure 20X in the exterior body 20 has an expansion-contraction area | region which can be expanded-contracted to the width direction. In the stretchable region 80, the elastic film 30 has a portion 32 which is linearly continuous along the width direction, and is contracted in the width direction by the contraction force of the elastic film 30, and is stretchable in the width direction It has become. More specifically, in a state in which the elastic film 30 is stretched in the width direction, the through holes 31 of the elastic film 30 are spaced apart from each other in the width direction and in the back and forth direction (direction orthogonal to the expansion and contraction direction) orthogonal thereto. The first sheet layer 20A and the second sheet layer 20B are joined to form a large number of sheet bonding portions 40, thereby forming the elastic film stretch structure 20X, and in the stretch area 80, the elastic film 30 extends in the width direction Such elasticity can be provided by arranging the through holes 31 so as to have a linearly continuous portion along them.

  In the natural length state, as shown in FIGS. 7D and 9D, the elastic region 80 bulges in the direction in which the first sheet layer 20A and the second sheet layer 20B between the sheet bonding portions 40 are separated from each other. Thus, as shown in FIGS. 7 (c) and 9 (c), although the contraction rod 25 is extended in the width direction to some extent, the contraction rod 25 is stretched but remains as shown in FIGS. 7 (c) and 9 (c). It has become. Further, as in the illustrated embodiment, the first sheet layer 20A and the second sheet layer 20B are not joined to the elastic film 30 except at least between the first sheet layer 20A and the second sheet layer 20B in the sheet joining portion 40. 7 (c) and 9 (d) assuming the mounted state, and FIGS. 7 (a) and (b) and FIGS. 9 (a) (d) assuming the expanded state of the first sheet layer 20A and the second sheet layer 20B. As can be seen from b), in these states, a gap is formed between the through hole 31 in the elastic film 30 and the sheet bonding portion 40, and the material of the elastic film 30 is a non-porous film or sheet Also, this gap adds breathability. Further, in the natural length state shown in FIGS. 7D and 9D, the contraction of the elastic film 30 causes the through hole 31 to be shrunk, and a gap is almost formed between the through hole 31 and the sheet bonding portion 40. I will not. The state of the contraction rod 25 in the mounted state and in the natural length state also appears in FIGS. 8 and 10.

  It is desirable that the elastic limit elongation in the width direction of the stretchable area 80 be 200% or more (preferably 265 to 295%). The elastic limit elongation of the expansion and contraction region 80 is substantially determined by the elongation rate of the elastic film 30 at the time of manufacture, but is reduced by the factor that inhibits the contraction in the width direction based on this. The main factor of such an impeding factor is the ratio of the length 40x of the sheet bonding portion 40 per unit length in the width direction, and the elastic limit elongation decreases as the ratio increases. In a normal case, since the length 40x of the sheet bonding portion 40 has a correlation with the area ratio of the sheet bonding portion 40, the elastic limit elongation of the stretchable region 80 can be adjusted by the area ratio of the sheet bonding portion 40.

  The extensional stress of the stretchable area 80 can be adjusted mainly by the sum of the widths 32w of the portions 32 in which the elastic film 30 linearly continues along the width direction. The width 32w of the portion 32 in which the elastic film 30 is linearly continuous along the width direction is equal to the interval 31d in the front-rear direction of the through holes 31 in contact with both side edges of the continuous portion 32; 31d is when the length 31y of the through hole 31 in the front-rear direction and the length 40y of the sheet bonding portion 40 in the front-rear direction are equal (in the case where the above-mentioned simultaneous formation method of the through hole 31 and the sheet bonding portion 40 is adopted) ) Is equal to the distance 40d in the front-rear direction of the sheet bonding portion 40 in contact with both side edges of the continuous portion. Therefore, in this case, the expansion stress of the expansion and contraction region 80 can be adjusted by the ratio of the length 40y of the sheet bonding portion 40 per unit length in the front and rear direction. Since the length 40 y is correlated with the area ratio of the sheet bonding portion 40, the length of the sheet bonding portion 40 can be adjusted by the area ratio of the sheet bonding portion 40. The extensional stress of the expansion and contraction region 80 can be set as a standard when it is extended to 50% of the elastic limit.

The area ratio of the sheet bonding portion 40 in the stretchable region 80 and the area of each sheet bonding portion 40 can be determined as appropriate, but in the normal case, it is preferable to be in the following range.
Area of sheet bonding portion 40: 0.14 to 3.5 mm ² (especially 0.14 to 1.0 mm ² )
Area ratio of sheet bonding portion 40: 1.8 to 19.1% (particularly, 1.8 to 10.6%)

  As described above, since the elastic limit elongation and the extension stress of the stretchable area 80 can be adjusted by the area of the sheet bonding portion 40, a plurality of areas in which the area ratio of the sheet bonding portion 40 in the stretchable area 80 is different as shown in FIG. Can be provided to change the fit according to the site. In the embodiment shown in FIG. 15, the area 81 extending obliquely along the base of the leg in the front body F and the edge area 82 of the leg opening have a high area ratio of the sheet bonding portion 40 compared with the other areas. Therefore, the tensile stress is weak, and it is a region that can be flexibly expanded and contracted. In addition, the iliac-facing region 83 in the back body B and the edge region 82 of the leg opening also have a high area ratio of the sheet bonding portion 40 compared to the other regions, and hence the region where the extension stress is weak and softly expands and contracts. It has become.

(Non-stretchable area)
A non-stretchable region 70 can be provided on at least one side in the width direction of the stretchable region 80 in the region having the elastic film stretchable structure 20X in the exterior body 20, as shown in FIG. The arrangement of the stretchable region 80 and the non-stretchable region 70 can be determined as appropriate. In the case of the exterior body 20 of the underpants type disposable diaper as in the present embodiment, a portion overlapping with the absorber 13 is a region that does not require expansion and contraction, so a part or all of the portion overlapping with the absorber 13 as illustrated. It is preferable to make the non-stretchable area 70 (it is desirable to include substantially the entire inside and outside fixed area 10B). Of course, the non-stretchable region 70 can be provided from the region overlapping with the absorber 13 to the region not overlapping with the absorber 13 located in the width direction or the front-back direction, and the non-stretchable region 70 can be provided only in the region not overlapping with the absorber 13 It can also be provided.

  The non-stretchable region 70 is a region in which the elastic film 30 is continuous in the width direction but does not have a linearly continuous portion along the width direction due to the presence of the through holes 31. Therefore, with the elastic film 30 stretched in the width direction, the first sheet layer 20A and the second sheet layer are formed via the through holes 31 of the elastic film 30 with intervals in the width direction and in the front-rear direction orthogonal thereto. Even if the entire elastic film elastic structure 20X including both the elastic region 80 and the non-elastic region 70 is formed by bonding 20B and forming a large number of sheet bonding portions 40, as shown in FIG. In the area 70, since the elastic film 30 is not linearly continued along the width direction, the contraction force of the elastic film 30 hardly acts on the first sheet layer 20A and the second sheet layer 20B, and the elasticity is almost lost. The elastic limit elongation is close to 100%. In such a non-stretchable region 70, the first sheet layer 20A and the second sheet layer 20B are joined by a large number of sheet joining portions 40 arranged at intervals, and the sheet joining portion 40 does not become continuous. Therefore, the loss of flexibility is prevented. In other words, the stretchable area 80 and the non-stretchable area 70 can be formed by the presence or absence of a portion where the elastic film 30 is not linearly continuous along the width direction. Further, the continuity of the elastic film 30 remains even in the non-stretchable region 70, and as can be seen from FIG. 12, since the independent cut pieces of the elastic film 30 do not remain and no creases are formed, the appearance is extremely good. And, the air permeability in the thickness direction by the through holes 31 is secured. The non-stretchable region 70 preferably has an elastic limit elongation in the width direction of 120% or less (preferably 110% or less, more preferably 100%).

  The arrangement pattern of the through holes 31 in the elastic film 30 in the non-stretchable region 70 can be appropriately determined, but as shown in FIG. 11, they are staggered and the center spacing 31e of the through holes 31 in the front-rear direction is the front and back of the through holes 31. If the pattern is shorter than the direction length 31y, linear continuity in the width direction can be almost completely eliminated while maintaining continuity of the elastic film 30, and the appearance is also preferable as shown in FIG. In this case, it is more preferable that the center interval 31f in the width direction of the through hole 31 be shorter than the length 31x in the width direction of the through hole 31.

  In a normal case, when the elastic film 30 has an elongation stress of 4 to 12 N / 35 mm when it is expanded four times in the width direction, penetration is performed in a state where the non-stretchable region 70 is extended to the elastic limit in the width direction. It is preferable that the center distance 31e in the front-rear direction of the holes 31 be 0.4 to 2.7 mm, and the length 31 y in the front-rear direction of the through holes 31 be 0.5 to 3.0 mm, particularly 0.7 to 1.1 mm. . In addition, it is preferable that the center interval 31f in the width direction of the through hole 31 be 0.5 to 2 times, particularly 1 to 1.2 times the length 31y in the front-rear direction of the through hole 31; It is preferable that the length 31x be 1.1 to 1.8 times, particularly 1.1 to 1.4 times the center interval 31f in the width direction of the through holes 31. In the state in which the non-stretchable region 70 is stretched in the width direction to the elastic limit (in other words, the state in which the first sheet layer 20A and the second sheet layer 20B are completely developed), the center interval 31f in the width direction of the through hole 31 Is equal to the center distance 40f in the width direction of the sheet bonding portion 40, the center distance 31e in the front-rear direction of the through hole 31 is equal to the center distance 40e in the front-rear direction of the sheet bonding portion 40, and the length 31y in the front-rear direction of the through hole 31 Is equal to the length 40 y of the sheet bonding portion 40 in the front-rear direction.

  In the non-stretchable region 70, the elastic film 30 is not joined to the first sheet layer 20A and the second sheet layer 20B except between the first sheet layer 20A and the second sheet layer 20B in the sheet bonding portion 40, When the peripheral edge of the through hole 31 of the elastic film 30 and the sheet bonding portion 40 are separated at both sides in the width direction of the sheet bonding portion 40 in the natural length state, the material of the elastic film 30 is Even a non-porous film or sheet is preferable because this gap always provides air permeability. When the above-described simultaneous formation method of the through hole 31 and the sheet bonding portion 40 is adopted, this state is naturally obtained regardless of the shape of the sheet bonding portion 40 or the like.

  The shapes of the individual sheet bonding portions 40 and the through holes 31 in the natural length state are not particularly limited, but it is desirable that the area be small from the viewpoint of flexibility, and linear continuity in the width direction of the elastic film 30 is eliminated. Since it is desirable that the shape is long in the front-rear direction, it has a long oval shape in the front-rear direction, a rectangle (see FIGS. 11 and 13 (d)), a rhombus (see FIG. 13 (b)), and a convex lens shape (see FIG. 13). It is preferable to use a concave lens shape (see FIG. 13C). However, the elastic film 30 is easily broken if the corner is an acute angle like a rhombus. On the other hand, the convex lens shape is preferable because the welding of the sheet bonding portion 40 is stabilized, and the concave lens shape is preferable in that the area can be further reduced.

Although the area ratio of the sheet bonding portion 40 and the area of the individual sheet bonding portions 40 in the non-stretchable region can be appropriately determined, in the normal case, the area of each sheet bonding portion 40 is small and the sheets It is preferable that the non-stretchable region 70 is hard because the area ratio of the bonding portion 40 is low.
Area of sheet bonding portion 40: 0.10 to 0.75 mm ² (particularly 0.10 to 0.35 mm ² )
Area ratio of sheet bonding portion 40: 4 to 13% (especially 5 to 10%)

  As described above, the elastic limit elongation of the non-stretchable region 70 can be changed according to the arrangement pattern of the through holes 31 and the size and center distance of the individual through holes 31. Therefore, although not shown, they may be made different between a plurality of locations in the stretchable region 80 or a plurality of non-stretchable regions 70. For example, it is one preferable embodiment to make the elastic limit elongation in the non-stretchable area 70 of the front body F larger than the elastic limit stretch in the non-stretchable area 70 of the rear body B.

  Although the non-stretchable region 70 has a linearly continuous portion along the width direction similarly to the stretchable region, the elastic limit elongation is extremely low because the area ratio of the sheet bonding portion is higher than that of the stretchable region. It is also possible to adopt a form that kills other stretchability such as a form of 130% or less, a form of cutting at one place or plural places in the width direction like a stretch structure using a conventional thread rubber, and the like.

(Design printing department)
Characteristically, as shown in FIG. 2, FIG. 14 and FIG. 15, the design printing section 33 is provided in a portion of the elastic film 30 located in the stretchable area 80. Since the elastic film 30 does not form wrinkles or wrinkles due to expansion or contraction, the design is not broken due to the wrinkles or wrinkles being formed on the print target of the design. In addition to the advantage that the stretchability of the stretchable region 80 is not affected at all, the surface of the elastic film 30 has the advantage of being excellent in printability as compared to the non-woven fabric, and the printing surface of the elastic film 30 has the first sheet layer 20A. And since it is covered with the 2nd sheet layer 20B, there is also an advantage of being hard to peel off printing.

  In order to provide the design print portion 33 on the elastic film 30, the elastic film 30 in which the design print portion 33 is printed in advance in the area to be the stretchable area 80 is used in manufacture, or prior to the expansion of the elastic film 30 (FIG. The design printing unit 33 may be printed on the portion of the elastic film 30 which is to be the stretchable area 80 in the in-line) on the upstream side of the feed drive roll 63 and the nip roll 62 in the manufacturing method 20. The printing method is not particularly limited, such as letterpress printing, gravure printing, offset printing, inkjet printing, and the like. In order to improve the printability of the elastic film 30, it is desirable to subject the print surface to a corona treatment.

  The design of the design printing unit 30 is not particularly limited. For example, patterns for decoration (including polka-dot patterns and flower patterns, etc., including pictures and one-point characters), usage indication, usage indication, function indication such as size, manufacturing A person, a product name, a mark display such as a characteristic function, or the like, or a combination thereof can be used.

  The design printing unit 33 may be provided on part of the elastic film 30 or may be provided on the entire elastic film 30. In the illustrated mode, it is assumed that the design print unit 33 having a uniform pattern is provided, and the design print unit 33 is provided over the entire width direction in part in the front-rear direction. Alternatively, the design print portion 33 may be provided only on the middle portion L in the width direction or only on both sides in the width direction. Further, as shown in FIG. 14B, the design print portion 33 can be provided not only in the stretchable area 80 but also in part or all of the non-stretchable area 70.

  When the design print unit 33 is provided on the elastic film 30, the design print unit 33 is deformed along with the expansion and contraction of the elastic film 30. In this case, as shown in FIG. 14A, if the entire design printing unit 33 is uniformly stretched, the shape of the design printing unit 33 is also deformed uniformly, so the balance of the entire design printing unit 33 is It will not collapse. However, the elastic film stretch structure 20X has a plurality of stretch areas 80 having different elastic limit elongations by changing the pattern of the sheet bonding portion 40, and has an advantage of being able to change the fit property or the stretch / non-stretch depending on the part. Have. Such a plurality of regions having different elastic limit elongations are cut into individual products or parts after forming the sheet bonding portion 40 in the manufacturing process, thereby the first sheet layer 20A, the second sheet layer 20B, and the like The elastic film 30 is formed by the difference in the amount of contraction and return of the elastic film 30 after the tension applied to the elastic film 30 is released. The amount of contraction and return of the elastic film 30 (including the non-stretched state which hardly shrinks) is lower than the elongation rate of the elastic film 30 stretched before the formation of the sheet bonding portion 40, It can be changed by the pattern. Therefore, when the design print portion 33 is uniformly provided in a portion to be a plurality of regions in the elastic film 30, in the natural length state or the attachment state, the deformation ratio in the expansion / contraction direction of the design print portion 33 differs for each region. The appearance will be worse.

  For example, as shown in FIG. 22 (a), there is a region where the elastic limit elongation is small and a region where the standard dimension 33s in the expansion and contraction direction of the design print unit 33 before extending the elastic film 30 is 100. A case will be considered in which the elongation rate of the elastic film 30 at the time of formation of the bonding portion 40 is 200%. The dimension 33 m of the design print portion 33 in the expansion / contraction direction at the time of forming the sheet bonding portion 40 is 200. Therefore, in the natural length state, the shrinkage return amount is small in the region where the elastic limit elongation is small. Then, the dimension 33n of the design print portion 33 in the expansion / contraction direction is 180, and the contraction return amount is large in the region where the elastic limit elongation is large. For example, when the contraction return amount is 80, the dimension 33t of the design print portion 33 in the expansion / contraction direction Becomes 120, and the deformation difference in the expansion / contraction direction of the design print unit 33 in both regions is largely different.

  On the other hand, in the area where the elastic limit elongation is small, that is, the area where the amount of contraction return is small after the elastic film 30 is extended to form the sheet bonding portion 40, the deformed design which is contracted in the expansion and contraction direction with high deformation is printed Then, the difference in deformation ratio in the expansion / contraction direction of the design print unit 33 between the regions becomes small, and the deterioration in appearance can be prevented. Here, the deformation rate means the ratio of the difference in length before and after shrinkage deformation to the length before shrinkage deformation as a percentage. For example, when considered under the same conditions as the specific example shown in FIG. 22 (a), as shown in FIG. 22 (b), a high deformation rate in the expansion and contraction direction, for example, 50% contraction deformation was made beforehand, and the expansion and contraction direction dimension was 33 v If a deformed design is printed, when forming the sheet joint portion 40, the dimension 33w in the stretch direction of the design print portion 33 extends to 200% to 100, and the stretch direction of the design print portion 33 in the natural length state The dimension 33z of 20 becomes 20 back to 80. In addition, in the area where the elastic limit elongation is large, when the deformation design of 80 dimensions is made in advance with a low deformation rate, for example, 20% shrinkage deformation and the expansion direction dimension of 33x, when forming the sheet bonding portion 40 The dimension 33y of the design print portion 33 in the expansion / contraction direction is expanded to 200% to 160, and the dimension 33z of the design print portion 33 in the natural length state is returned to 80 by 80. That is, the difference in deformation of the design print unit 33 in both regions in the expansion and contraction direction can be reduced.

  For example, as shown in FIG. 14 (b), when the design print portion is provided in the stretchable area and the non-stretchable area as shown in FIG. 14 (b), the appearance ratio is 100%. In order to reduce the deformation difference between the two areas close to each other, the deformation rate of the deformation design printed on the stretch area is about 20 to 40%, and the deformation rate of the deformation design printed on the non-stretch area is about 60 to 80% It is preferable to In addition, in order to reduce the difference in deformation between the two areas when the appearance is close to the standard magnification (100%) in the extended state at the time of wearing, the deformation ratio of the deformation design printed in the expansion and contraction area is about 45 to 55%. It is preferable that the deformation rate of the deformation design printed in the expansion and contraction area be about 60 to 80%.

  In addition, in the case where a plurality of regions having different elastic limit elongations are provided, if the design printing unit 33 straddles the boundaries of the regions, the two sides of the boundary are not uniformly deformed, and the appearance may be deteriorated. Therefore, in the case where a plurality of regions having different elastic limit elongations are provided, it is also a preferable embodiment that the design print portion 33 is not provided at the boundaries of the plurality of regions and the portions adjacent to both sides. The width of the portion adjacent to the boundary of the plurality of regions is preferably about 3 to 10 mm on both sides of the boundary.

  For example, when welding of the sheet bonding portion 40 is performed by ultrasonic sealing, the concave and convex concave portions formed in the sheet layer on the anvil roll 60 side become deeper, and the concave portion of the opposite sheet layer becomes shallow. The same applies to heat sealing. In the elastic film stretchable structure 20X, the design print unit 33 on the elastic film 30 sees the design print unit 33 through the first sheet layer 20A or the second sheet layer 20B. Therefore, when providing the design print portion 33 on the elastic film 30, if the design print portion 33 is provided on the surface on the sheet layer (small uneven layer) side having smaller recesses and smaller unevenness, the design print portion 33 looks better It has the advantage of getting better. Such a structure may be manufactured by supplying the elastic film 30 so as to have the design print unit 33 on the surface 30P of the elastic film 30 opposite to the anvil roll 60 in forming the sheet bonding unit 40. it can. In particular, according to the present manufacturing method, the crease formed on the first sheet layer 20A and the second sheet layer 20B of the stretchable area 80 in the natural length state is the sheet layer on the opposite side than the anvil roll 60 (20B in the illustrated embodiment) In this respect, too, the appearance of the design printing unit 33 is better, since the method of (3) is more orderly and beautifully formed.

  In the elastic film stretchable structure 20X, the design print unit 33 on the elastic film 30 sees the design print unit 33 through the first sheet layer 20A or the second sheet layer 20B so that the first sheet layer 20A and Of the second sheet layer 20B, the light transmittance of the layer on the viewing side is preferably high, for example, 60% or more, particularly 80% or more. In addition, light transmittance is measured as follows, for example using the Nippon Denshoku Industries Co., Ltd. product and photometry-type color-difference meter Z-300A. That is, first, measurement is performed in a state where a shield that shields light is disposed between one detection unit and the other detection unit, and the zero point correction is performed. Next, after removing the shield placed between one detection unit and the other detection unit, measurement is performed without light blocking and standard correction is performed. Then, the external sheet which is an object is measured in the state arrange | positioned between one detection part and another detection part.

  The elastic film 30 is not particularly limited as described above. However, since the design print portion 33 is provided, the width inclusion in the direction orthogonal to the expansion and contraction direction becomes a problem. That is, as shown in FIG. 23, when the elastic film 30 is expanded in one direction shown by a solid line from the state of natural length shown by a two-dot chain line, it is orthogonal to the expansion direction according to the amount of expansion. The width of the direction narrows toward the center in the expansion and contraction direction. This is called width insertion (or neck-in), and the “width insertion ratio” that indicates the degree is the minimum width (center in the length direction) when the elastic film 30 of width 33 B is stretched 3.5 times in the length direction (33B-33C) /33B.times.100 when the width of. When the elastic film 30 is shrunk to a natural length from this width-in-width state, the width also returns. The stretchable area 80 often varies in accordance with the position in the direction orthogonal to the stretch direction, so that the stretch amount in the stretch direction often changes so as to fit the body surface composed of a complicated curved surface. The degree of change also depends on the position in the direction orthogonal to the expansion and contraction direction. Therefore, when the design print portion 33 is provided on the elastic film 30 in the portion located in the expansion / contraction area 80, if the amount of expansion in the expansion / contraction direction changes according to the position in the direction orthogonal to the expansion / contraction direction, The amount of deformation of the design print unit 33 due to the change also changes depending on the position in the direction orthogonal to the expansion and contraction direction, and the appearance may be deteriorated. Therefore, as the elastic film 30, the width ratio is small, particularly preferably 25% or less, and more preferably 20% or less. Use of the elastic film 30 having such a low width ratio also makes it possible to obtain excellent manufacturing stability and in-line printability.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise indicated in the specification.
"Front body" and "back body" mean front and rear portions of the pants-type disposable diaper, respectively, bordering on the front-rear direction center. In addition, the crotch refers to a range in the front-rear direction including the center in the front-rear direction of the pants-type disposable diaper, and when the absorber has a constricted portion, it refers to the longitudinal range of the portion having the constricted portion.
-"Elastic limit elongation" means the extension of the elastic limit in the direction of expansion and contraction (in other words, the state in which the first sheet layer and the second sheet layer are fully developed), and the length at the elastic limit is the natural length. It is expressed as a percentage based on 100%.
The “area ratio” means the ratio of the target portion to the unit area, and the target portion (for example, the sheet bonding portion 40) in the target region (for example, the stretchable region 80, the non-stretchable region 70, the main stretchable portion, and the buffer stretchable portion) The total area of the opening of the through hole 31 and the vent hole is divided by the area of the target area and expressed as a percentage. Particularly, the "area ratio" in the area having the expansion and contraction structure is stretched to the elastic limit in the expansion and contraction direction It means the area ratio in the dry state. In the embodiment in which a large number of target portions are provided at intervals, it is desirable to set the target area to a size that includes 10 or more target portions and to obtain the area ratio.
"Stretch rate" means the value when natural length is 100%.
・ "Age" is measured as follows. After pre-drying the sample or test piece, it is left in a test room or apparatus under standard conditions (the test place is at a temperature of 20 ± 5 ° C. and a relative humidity of 65% or less) to be in a constant weight state. Pre-drying means making a sample or a test piece constant weight in an environment not exceeding a relative humidity of 10 to 25% and a temperature of 50 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture percentage is 0.0%. A sample of 200 mm × 250 mm (± 2 mm) in size is cut out from a test piece in a constant weight state using a rice-based board (200 mm × 250 mm, ± 2 mm). The weight of the sample is measured, and the weight per square meter is calculated and taken as the basis weight.
・ The “thickness” of the absorber is the thickness measuring instrument of Ozaki Manufacturing Co., Ltd. (Pecock, Dial Thickness Gauge Large Type, Model J-B (Measurement Range 0 to 35 mm) or Model K-4 (Measurement Range 0 to 50 mm)) Measure with the sample and thickness gauge horizontal.
- other than the above "thickness" is used automatic thickness measuring instrument (KES-G5 Handy Compression measurement program), load: 0.098 N / cm ^2, and the pressure area: automatically measured under the conditions of 2 cm ^2.
・ “Tensile strength” and “Tensile elongation (breaking elongation)” conform to JIS K 7127: 1999 “Plastic-Test method of tensile properties-” except that the test piece is made into a rectangular shape of 35 mm wide × 80 mm long. It means that the initial chuck distance (marked line distance) is 50 mm and the tensile speed is 300 mm / min. For example, AUTOGRAPH AGS-G100N manufactured by SHIMADZU can be used as a tensile tester.
· “Tensile stress” is a tensile test based on JIS K 7127: 1999 “Plastic-Test method for tensile properties-” with an initial chuck spacing (marked line distance) of 50 mm and a tensile speed of 300 mm / min. This means the tensile stress (N / 35 mm) measured when stretching in the elastic region, and the degree of stretching can be appropriately determined depending on the test object. Although it is preferable to make a test piece into a rectangular shape with a width of 35 mm and a length of 80 mm or more, when a test piece with a width of 35 mm can not be cut out, a test piece is made with a width that can be cut out and the measured value is 35 mm wide The value converted to In addition, even when the target area is small and sufficient test pieces can not be collected, at least comparison can be made as long as test pieces of the same size are used even if the small test pieces are appropriately compared if the magnitude of the extension stress is compared. . For example, AUTOGRAPH AGS-G100N manufactured by SHIMADZU can be used as a tensile tester.
"Expanded state" means a flat state without contraction or slack.
-Unless otherwise indicated, the dimension of each part means the dimension in the unfolded state, not the natural length state.
・ If there is no description about the environmental conditions in the test or measurement, the test or measurement shall be conducted in the test room or equipment in the standard condition (the test place is temperature 20 ± 5 ° C, relative humidity 65% or less) .

  The present invention is applicable to general absorbent articles provided with an elastic region such as various types of disposable diapers such as a tape type and a pad type, a sanitary napkin, and the like other than the pants type disposable diaper as described above.

  B: back body, F: front body, T: waist part, L: middle part, 10: interior body, 10B: inside and outside fixed area, 11: liquid permeable top sheet, 12: liquid impermeable sheet, 13 ... Absorbent body, 13N: neck portion, 14: packaging sheet, 95: gathered nonwoven fabric, 96: gathered elastic member, 17: non-absorbent side, 20: exterior body, 20A: first sheet layer, 20B: second sheet layer, 20C: Folded part, 20X: Elastic film stretch structure, 21: Side seal part, 23: Waist end area, 24: Elastic part of waist part, 25: Shrinking ridge, 29: Line around leg, 30: Elastic film, 31: 31 Through hole, 40: sheet junction, 70: non-stretchable area, 80: stretchable area, 84: weak stretchable area, 90: solid gather, 33: design print part.

Claims (8)

An elastic film is laminated between the first sheet layer and the second sheet layer, and the first sheet layer and the second sheet layer are directly or through the elastic film at a plurality of sheet junctions arranged at intervals. Equipped with elastic film expansion and contraction structure,
The area having the elastic film expansion and contraction structure has an expansion and contraction area expandable in one direction,
The stretchable region is contracted in the stretchable direction by the contraction force of the elastic film, and is stretchable in the stretchable direction.
The elastic limit elongation in the expansion and contraction direction of the expansion and contraction area is 200 to 295%,
The elastic film is provided with a design printing portion including a pattern for decoration uniformly provided over the whole ,
When the expansion amount in the expansion and contraction direction changes in accordance with the position in the direction orthogonal to the expansion and contraction direction, the deformation amount of the design print portion due to the width of the elastic film corresponds to the position in the direction orthogonal to the expansion and contraction direction Change, and
The elastic film has a width ratio of 20% or less in a direction orthogonal to the expansion and contraction direction.
An absorbent article characterized by the above. An elastic film is laminated between the first sheet layer and the second sheet layer, and the first sheet layer and the second sheet layer are directly or through the elastic film at a plurality of sheet junctions arranged at intervals. Equipped with elastic film expansion and contraction structure,
The area having the elastic film expansion and contraction structure has an expansion and contraction area expandable in one direction,
The stretchable region is contracted in the stretchable direction by the contraction force of the elastic film, and is stretchable in the stretchable direction.
A portion of the elastic film located in the stretchable area is provided with a design printing unit including at least one of a decorative pattern, a function indication, and a mark indication.
The elastic film has a width ratio of 25% or less in a direction orthogonal to the expansion and contraction direction,
The sheet bonding portion is a portion in which the first sheet layer and the second sheet layer are welded through a through hole that penetrates the elastic film, and the non-facing side of the first sheet layer and the second sheet layer It is a part where a recess is formed on the surface,
Either one of the first sheet layer and the second sheet layer is a shallow uneven layer having a shallower portion in the recess than the other,
The design print unit is provided on the surface of the elastic film on the small uneven layer side.
An absorbent article characterized in that. An elastic film is laminated between the first sheet layer and the second sheet layer, and the first sheet layer and the second sheet layer are directly or through the elastic film at a plurality of sheet junctions arranged at intervals. Equipped with elastic film expansion and contraction structure,
The area having the elastic film expansion and contraction structure has an expansion and contraction area expandable in one direction,
The stretchable region is contracted in the stretchable direction by the contraction force of the elastic film, and is stretchable in the stretchable direction.
A portion of the elastic film located in the stretchable area is provided with a design printing unit including at least one of a decorative pattern, a function indication, and a mark indication.
The elastic film has a width ratio of 25% or less in a direction orthogonal to the expansion and contraction direction,
The elastic film stretch structure has a plurality of regions having different elastic limit elongations, and does not have the design print portion at the boundary of the plurality of regions in the elastic film and the portions adjacent to both sides thereof.
An absorbent article characterized in that. An outer body constituting a front body and a rear body, an inner body including an absorber fixed to the outer body, and both sides of the outer body in the front body and both sides of the outer body in the rear body are respectively joined A pants-type disposable diaper comprising a side seal portion, an annular waist portion, a waist opening and a pair of left and right leg openings,
The outer covering body in at least one of the front body and the rear body covers the elastic film expansion / contraction structure over the width direction range corresponding to the space between the side seals in at least a part of the front / rear direction. Prepares to be in the width direction,
The absorbent article according to any one of claims 1 to 3. In a method of manufacturing an absorbent article provided with an elastic film elastic structure including an elastic region expandable in one direction,
The elastic limit elongation in the expansion and contraction direction of the expansion and contraction area is 200 to 295%,
The elastic film has a width ratio of 20% or less in a direction orthogonal to the expansion and contraction direction,
At the time of forming the elastic film stretch structure, a large number of places are arranged between the first sheet layer and the second sheet layer, with an elastic film being nipped and stretched in the stretch direction of the stretch region, spaced apart Bonding the first sheet layer and the second sheet layer directly or via the elastic film to form a sheet bonding portion;
As the elastic film, an elastic film on which a design printing portion including a pattern for decoration uniformly provided throughout is printed in advance is used, or the elastic film is in-line prior to the expansion of the elastic film. By printing a design print that includes a pattern for uniform decoration throughout the
When the expansion amount in the expansion and contraction direction changes in accordance with the position in the direction orthogonal to the expansion and contraction direction, the deformation amount of the design print portion due to the width of the elastic film corresponds to the position in the direction orthogonal to the expansion and contraction direction Obtain the elastic film stretch structure that changes
A manufacturing method of an absorbent article characterized by things. In a method of manufacturing an absorbent article provided with an elastic film elastic structure including an elastic region expandable in one direction,
The elastic film has a width ratio of 25% or less in a direction orthogonal to the expansion and contraction direction,
At the time of forming the elastic film stretch structure, a large number of places are arranged between the first sheet layer and the second sheet layer, with an elastic film being nipped and stretched in the stretch direction of the stretch region, spaced apart Bonding the first sheet layer and the second sheet layer directly or via the elastic film to form a sheet bonding portion;
As the elastic film, an elastic film on which a design printing portion including at least one of a pattern for decoration, a function indication and a mark indication is printed in advance in a portion to be the expansion and contraction area is used, or the elastic film is expanded Prior to printing a design printing portion including at least one of a decorative pattern, a function indication, and a mark indication on a portion to be the elastic region in the elastic film in line,
When forming the elastic film stretch structure, the elastic film is stretched between the first sheet layer and the second sheet layer while being stretched in the stretch direction of the stretch region, and the elastic film, the first sheet layer, and The second sheet layer is passed between the anvil roll and the ultrasonic horn to apply an ultrasonic seal, and the first sheet layer and the second sheet layer are directly joined to form the sheet joint.
The elastic film is supplied so as to have the design printing portion on the surface of the elastic film opposite to the anvil roll side.
A method of producing an absorbent article, characterized in that In a method of manufacturing an absorbent article provided with an elastic film elastic structure including an elastic region expandable in one direction,
The elastic film has a width ratio of 25% or less in a direction orthogonal to the expansion and contraction direction,
At the time of forming the elastic film stretch structure, a large number of places are arranged between the first sheet layer and the second sheet layer, with an elastic film being nipped and stretched in the stretch direction of the stretch region, spaced apart Bonding the first sheet layer and the second sheet layer directly or via the elastic film to form a sheet bonding portion;
As the elastic film, an elastic film on which a design printing portion including at least one of a pattern for decoration, a function indication and a mark indication is printed in advance in a portion to be the expansion and contraction area is used, or the elastic film is expanded Prior to printing a design printing portion including at least one of a decorative pattern, a function indication, and a mark indication on a portion to be the elastic region in the elastic film in line,
When forming the elastic film expansion / contraction structure, a plurality of expansion / contraction regions having different elastic limit elongations are formed by differentiating the pattern of the sheet bonding portion,
While printing the design printing part on the part which becomes the above-mentioned a plurality of fields in the above-mentioned elastic film, in the printing,
Print a deformed design that has shrunk in the expansion / contraction direction with a high deformation rate in the region where the elastic limit elongation is smaller.
A method of producing an absorbent article, characterized in that In a method of manufacturing an absorbent article provided with an elastic film elastic structure including an elastic region expandable in one direction,
The elastic film has a width ratio of 25% or less in a direction orthogonal to the expansion and contraction direction,
At the time of forming the elastic film stretch structure, a large number of places are arranged between the first sheet layer and the second sheet layer, with an elastic film being nipped and stretched in the stretch direction of the stretch region, spaced apart Bonding the first sheet layer and the second sheet layer directly or via the elastic film to form a sheet bonding portion;
As the elastic film, an elastic film on which a design printing portion including at least one of a pattern for decoration, a function indication and a mark indication is printed in advance in a portion to be the expansion and contraction area is used, or the elastic film is expanded Prior to printing a design printing portion including at least one of a decorative pattern, a function indication, and a mark indication on a portion to be the elastic region in the elastic film in line,
In forming the elastic film stretch structure, a plurality of regions having different elastic limit elongations in the product are formed;
Do not print a design printing portion on the boundary of the plurality of regions in the elastic film and the portion adjacent to the both sides thereof
A method of producing an absorbent article, characterized in that