JP2002035029A - Method for manufacturing stretchable sheet and paper diaper using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cut a stretching member sandwiched by sheets without breaking the sheets. SOLUTION: A laminate 940 is formed by coating at least one of both upper and lower sheets with hot melt adhesives and inserting the stretching member 920 in a stretched state between both upper and lower sheets 930 and 910. The laminate 40 is passed between an embossing heat roll 950 disposed with projecting part 952 groups in zigzag and a counter roll 960 and the upper and lower sheets 930 and 910 are heat sealed by the projecting part 952 groups of the embossing heat roll 950 to form sealed parts and the stretching member 920 existing thus far in the sealed parts is cut by heating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an elastic sheet by attaching an elastic member made of an elastic material such as thread rubber to a sheet such as a nonwoven fabric or a plastic film.

[0002]

2. Description of the Related Art Disposable wearing articles such as disposable diapers and disposable pants are required to be stretchable around a waist, around a leg, around a torso, etc. in order to improve the adhesion to a wearer. . It is also conceivable to use a woven fabric (stretch fabric) that has the elasticity of the material itself,
It is costly to use for disposable wear articles. For this reason, usually, a thread-like or band-like stretchable member is adhered to a nonwoven fabric or a plastic film in an extended state, and these non-stretchable sheets can be stretched.

[0003] In order to continuously manufacture such an elastic sheet, a non-elastic sheet is pulled out of a roll and stretched under a predetermined tension while the non-elastic sheet is being pulled out from a roll and run. Is adopted. However, due to the shape of the disposable wearing article or the convenience of cutting into individual products, it is sometimes necessary to intermittently provide a portion that does not need to be expanded and contracted and an elastic portion in the running direction of the seat.

[0004] It is conceivable to attach the stretchable member to the sheet without applying tension to a portion that does not need to be expanded or contracted. However, it is possible to quickly switch between a state in which tension is applied and pulled and a state in which no tension is applied. Are difficult to manufacture.

[0005] Therefore, usually, an adhesive is intermittently applied to a sheet, and an adhesive-applied portion and a non-applied portion are alternately provided on the sheet along the sheet traveling direction. Is cut off to provide a non-stretchable portion. In the adhesive non-applied portion, the elastic member is not adhered to the sheet, so the elastic member cut at one point is pulled toward the elastic member adhered to the sheet, relaxes, and stays there. .

[0006] As a method for cutting the elastic member, a first roll having a continuous linear convex portion (single blade) continuous in the roll width direction is provided between a first roll and a second roll facing the first roll. There is a type in which a sheet on which an elastic member is arranged is passed and the elastic member is cut by pressurization or heating by a linear convex portion of a first roll.

[0007]

However, in this conventional method, since a cutting force is applied in a continuous line along the roll width direction, when a cutting force is applied to a portion where no elastic member exists, In some cases, the sheet was broken. In addition, even if the sheet does not break, the sheet of non-woven fabric or the like is formed into a film by thermocompression bonding, so a single seal line with a hard touch will remain across the part where the elastic member does not exist. When you look good,
There was a problem that both of the wearing feelings became insufficient.

[0008] Accordingly, a main object of the present invention is to enable cutting of an elastic member without fear of sheet breakage.

[0009]

The present invention which has solved the above-mentioned problems is as follows. <Invention according to claim 1> On a sheet or between upper and lower sheets, one or more stretchable members such as a thread, a net, and a sheet are arranged in a stretched state to form a laminate, and a plurality of convex portions are formed on the surface. The laminated body is passed between a first roll arranged individually and a second roll opposed to the first roll, and the elastic member of the laminated body is moved to the convex portion of the first roll and A method for producing a stretchable sheet, comprising cutting by at least one of pressure and heating between second rolls.

<Operation> With this configuration, the elastic member can be reliably cut.

<Invention according to claim 2> Between the upper and lower sheets,
One or a plurality of thread-like, net-like, sheet-like stretchable members are sandwiched in a stretched state to form a laminate, a first roll having a plurality of convex portions arranged on the surface, and a first roll facing the first roll. Between the two rolls, passing the laminate,
A method for producing a stretchable sheet, characterized in that the stretchable member of the laminate is cut by at least one of pressure and heating between the convex portion of the first roll and the second roll.

<Function> The same function and effect as the first aspect of the invention can be obtained in a mode in which the laminate is sandwiched between the upper and lower sheets.

[0013] The stretchable sheet according to claim 1 or 2, wherein an adhesive is applied to at least one of the upper and lower sheets, and the stretchable member is sandwiched between the upper and lower sheets and bonded. Manufacturing method.

<Function> The same function and effect as those of the first aspect of the invention can be obtained even in a mode in which an adhesive is applied to at least one of the upper and lower sheets.

<Invention according to claim 4> As the first roll, a plurality of protrusions having a length of 1 to 25 mm and a width of 0.5 to 15 mm are arranged in the axial direction of the roll every 1 to 25 mm, The method for producing a stretchable sheet according to any one of claims 1 to 3, wherein a roll having a plurality of rows of the convex groups arranged in a circumferential direction of the roll is used.

<Operation> According to the fourth aspect of the present invention, not only can the elastic member be reliably cut as in the first and second aspects, but also the following operational effects can be obtained.

That is, since no cutting force acts on the extensible members other than the protruding portions, there is a portion where the extensible member in the roll axis direction is not cut and a portion where the extensible member is cut, so that the retractable member is partially pulled in by cutting. It is a sheet with less foreign matter feeling and good mounting properties.

Further, since a cutting force does not act between the convex portions, even if a cutting force such as cutting the sheet in the roll axis direction acts, the portion between the convex portions is not affected. The corresponding sheet is prevented from being cut. Therefore, even if the sheet is partially cut, it is unlikely that the sheet will be broken. In addition, it is also possible to improve the air permeability of the sheet by partially cutting the sheet.

Further, when the size of the convex portion is within the range described in claim 4, the elastic member can be reliably cut, and the area of the seal portion is reduced, so that the feel is improved.

<Invention according to claim 5> As the first roll, a roll in which the protrusions are arranged in a staggered manner, or a roll in which the shape of the protrusions is a lattice, a line, or a diamond is used. A method for producing a stretchable sheet according to claim 1.

<Operation> In particular, when the plurality of protrusions are separate from each other, if the protrusions are arranged in a staggered manner, the elastic member can be reliably cut. Also, the elastic member can be reliably cut by the lattice-shaped protrusions in which the plurality of protrusions are integrated. When the shape of the convex portion is linear or rhombic, it is easy to perform staggered arrangement and the appearance is improved. In addition, the same operation and effect as described above can be obtained.

<Invention according to claim 6> The adhesive is applied to at least one of the sheet and the elastic member continuously or discontinuously in the longitudinal direction, or partially, entirely or partially except for the whole. The method for producing a stretchable sheet according to any one of claims 1 to 5, wherein the method is applied to a stretchable sheet.

<Operation> The same operation and effect as described above can be obtained in any of these adhesive application forms. In particular, the method of discontinuous coating along the longitudinal direction is suitable for a case where a stretchable sheet having a non-stretchable portion and a stretchable portion is continuously manufactured. In addition, the same operation and effect as described above can be obtained.

<Invention according to claim 7> When the elastic member is cut, all or a part of the elastic member is cut.
A method for producing the stretchable sheet according to claim 1.

<Operation> The same operation and effect as described above can be obtained even when all or a part of the elastic member is cut.

<Invention according to claim 8> A stretch sheet manufactured by the method according to any one of claims 1 to 7 is attached to a stretch imparting portion.
Paper diapers.

<Operation> In a disposable diaper to which the stretchable sheet manufactured by the method according to any one of claims 1 to 7 is applied, the feel given to the wearer is soft and the appearance is good.

[0028]

Embodiments of the present invention will be described below in detail with reference to the drawings. <Embodiment of Stretchable Sheet Manufacturing Method> (First Embodiment) FIG. 1 shows a perspective explanatory view of an example of a method of manufacturing a stretchable sheet according to a first embodiment of the present invention. The direction of the arrow is the seat traveling direction.

A belt-shaped lower sheet 910 having a predetermined width is applied to an adhesive applying section 9 by a hot melt adhesive applying machine (not shown).
The vehicle runs from the right side to the left side in the state where the 11 and the non-coating portion 912 are provided. In the present invention, FIG.
The adhesive 912 can be applied continuously in the sheet longitudinal direction as shown in FIG. The hot melt adhesive is preferably applied by a spray coater, a curtain coater, a spiral coater or the like from the viewpoint of air permeability.

The plurality of extensible members 920 are attached to the lower sheet 910 while being guided by the guide 921 in a state where the plurality of extensible members 920 are unwound from the extensible member roll and are passed through the tension roll and are given a predetermined tension. Be worn. At this time, the upper sheet 930 and the lower sheet 9
10, the elastic member 920 is sandwiched between the
1 and 932, these are pressed and the upper sheet 930, the lower sheet 910, and the elastic member 920 are firmly adhered in the adhesive application section 911.

Thus, the laminated body 40 in which the elastic member 920 is sandwiched between the upper and lower sheets 930 and 910 is obtained.

The laminated body 940 includes an embossed heat roll (corresponding to a first roll of the present invention) 950 having an embossed portion 951 and a counter roll (corresponding to a second roll) 96.
0, and only the elastic member is cut. X in FIGS. 1 and 2 indicates a cut portion. Embossed part 95
The length L ₂ is slightly shorter than the length L ₁ of the adhesive non-applied portion 912. Also, the adhesive non-applied portion 9
The coating interval, the circumference of the embossing heat roll 950, and the running speed are adjusted so that the embossed portion 951 comes into contact with the embossed portion 951.

The opposing roll 960 may be separated from the embossing heat roll 950 as shown in FIG. 3A so as to contact only the embossed portion 951 of the embossing heat roll 950. When the embossed portion 951 moves down due to the rotation of both rolls, it comes into contact with the opposing roll 960. It should be noted that the embossed portion 951 is further formed with small projections (projections of the present invention) 952 as illustrated in FIG. 4, and in fact, the tip surfaces of these projections 952 are opposed to the opposing roll 960. Abut. Counter roll 960
On the side, a concave portion that fits into the embossed portion 951 may be provided.

FIG. 4 shows an example of a preferable emboss pattern.
(A) and (b) show. FIG. 4A shows an emboss pattern in which a plurality of linear convex portions are arranged in a staggered manner. A row of convex groups in which linear convex parts 953, 953 having a length S ₁ and a width W ₁ are disposed at a distance D ₁ in the axial direction (the direction of the black arrow) of the embossing heat roll 950, and the convex parts 53 The same length S ₁ ,
The protrusions 954 and 954 having a width W ₁ are separated from the protrusions 953 by a distance M ₁ in the circumferential direction of the embossing heat roll 950 (in the direction of the outlined arrow), and the center line in the length direction of the protrusions 954 is 2. A row of convex groups arranged so as to pass through the point of / D ₁ and a convex 5
The projections 955 and 955 having the same shape as the projection 3 are formed from a row of projection groups arranged in the same arrangement as the projection 953. The number of protrusions in one row may be appropriately set according to the number of elastic members to be cut or the like. The number of columns of the convex portion groups can be appropriately set according to the length L ₁ of the adhesive non-applying portion.

FIG. 4B shows a pattern in which rhombic convex portions are arranged in a staggered manner. A row of convex groups in which diamond-shaped convex portions 956 and 956 having a long axis S ₂ and a short axis W ₂ are disposed at a distance D ₂ in the axial direction (black arrow direction) of the embossed heat roll 50; the protrusions 957,957 of the same rhombic shape as 56 in the circumferential direction of the embossing heat roll 950 (open arrow), at a convex portion 956 and the distance M _2, and the convex portion 957
And a row of convex groups arranged so that the minor axis of the convex section corresponds to a point of 2 / D ₂ , and convex sections 958 having the same shape and the same arrangement as the convex section 956.
958. Of course also in this pattern, the number of the projections in one row, in number like the elastic material to be cut, the number of columns of the convex portion group, it is appropriately set according to the length L ₁ of the adhesive non-application portion Can be done.

The length S ₁ of the linear projection and the major axis S _{2 of the} rhombus are
Preferably in the range of 1 to 25 mm, 5 to 25 mm
Is more preferred. In addition, the distance D ₁ between the adjacent convex portion and
Preferably, S ₁ is the same or S ₁ is longer. Because of the staggered arrangement, the elastic member located between the convex portions 953 can be reliably cut by the convex portions 954. D ₂
And also in S _2, when When D ₂ ≦ S ₂ is preferably S ₁ or S ₂ shorter than 1 mm, there may not be cutting the elastic members in some cases, when longer than 25 mm, the area of the seal portion Becomes too large, and the touch feeling may be deteriorated. Therefore, preferably in the range of 1~25mm a range from D ₁ and D _2, D ₁ is, 3 to 25 mm is good Li preferred.
When the convex portion is a rhombus, when the corners of the convex portions adjacent in the roll circumferential direction slightly overlap each other when viewed from the direction in which the elastic member is attached, the elastic member may escape from the seal portion and cannot be cut. D ₂ is 3~10mm is more preferable.

The width W ₁ of the linear projection and the short axis W _{2 of the} rhombus are:
It is preferably 0.5 to 15 mm. If it is thinner than 0.5 mm, there is a possibility that cutting of the elastic member cannot be performed,
If the thickness is larger than 15 mm, the area of the seal portion may be too large, and the feel may be poor. It is attached to the W _2,
More preferably, the lower limit is 1 mm or more.

The distance between columns of the convex portion group is not particularly limited, M ₁ or M ₂ is 5~25mm is preferred. The shape of the convex portion is not limited to the linear shape and the rhombic shape, but may be applied to a diagonal line, a circle, a triangle, a star, other polygons, or the like. It can be changed depending on each row of the convex portions.

FIG. 5 schematically shows a state in which the elastic member has been cut. In the figure, it is assumed that the vehicle is traveling downward. Reference numeral 911 denotes an adhesive application portion, and 912 denotes an adhesive non-application portion. The left elastic member 922 is cut by the nearest seal portion 970 (corresponding to the convex portion 953), and its end 922a is released from the tension state, and the elastic member 922 joined and fixed to the sheet. Shrinks to If the remaining elastic member is supplemented by the convex portion 55 before the cutting by the convex portion 953 is completed, the elastic member 922b located between the convex portion 953 and the convex portion 955 will be removed by the sealing portion 72 when the convex portion 953 cuts. Shrink to the side. If the cutting by the convex portion 953 is completed before the remaining elastic member is captured by the convex portion 955, the contraction toward the elastic member (not shown) existing in the downstream adhesive application section is performed. Will be done. Further, the right elastic member 923 is also the closest seal part 9.
71 (corresponding to the convex portion 954), and the end 923a is contracted.

On the other hand, FIG. 6 shows a cutting mode in the case of the above-mentioned rhombus convex portion 956, and the same cutting and sealing as in the case of the linear convex portion are performed.

With the above structure, the elastic member is cut, a large number of small seal groups are formed in the non-elastic portion, and the upper and lower sheets are joined also in the adhesive application portion. Since the seal portions are separated from each other and are small one by one, even if it is formed into a film by heat sealing, it does not cause discomfort to the wearer as compared with the case of a long continuous line.

(Second Embodiment) As shown in FIG. 7, instead of the embossed heat roll having the protrusions arranged in a spaced manner in the first embodiment, as shown in FIG.
Has a group of recesses of 5 to 15 mm, the width of the crossbar is 0.5 to 5 mm
(Embodiment 2) using an embossed heat roll having a lattice-shaped convex portion 960 is also proposed. Lattice convex part 9
60 are formed by crossing a number of bars 961, 961... In a grid pattern, and a space 962 surrounded by the bars 961 is a concave portion (lattice). W ₃ is the width of the crosspiece, 0.5 to 5
mm is preferable. If the thickness is too large, the tactile sensation may be deteriorated. On the other hand, if the thickness is smaller than 0.5 mm, the shape becomes like a knife, and both the upper and lower sheets may be cut. The length of the grid-shaped recess is D _3, preferably from 5 to 25 mm, more preferably from 5 to 10 mm. Width of the grid-shaped recess is M _3, preferably from 5 to 25 mm, more preferably from 5 to 10 mm. FIG. 7 shows an oblique lattice, but of course, a square or rectangular lattice may be used. In this embodiment, the elastic members can be reliably cut because they are sealed in a lattice shape. Further, since the portion corresponding to the lattice recess 962 is not sealed, the sheet is not broken. In addition, there is a thin lattice-like convex part in a certain area, and it is in a mesh shape,
What is necessary is just to cut | disconnect an expansion-contraction member in either seal part. When sealing with a single blade, all the elastic members must be cut with a single blade, so it is necessary to seal tightly so that there is no elastic member that is not cut, and it will break up to the sheet However, in the above configuration, since the elastic member may be cut at the seal portion, there is no need to strongly seal the sheet, and the sheet is not broken because the sheet may be pressed against the surface. . In addition, the lattice-shaped seal portion gives the wearer a soft touch and is beautiful in appearance.

(Others) (A) It is preferable that at least one of the embossing heat roll 950 and the opposing roll 960 shown in FIG. 1 is provided with a heating means so as to fuse the elastic member and seal the upper and lower sheets. . A rod-shaped sheathed heater may be provided near these rolls, or another heating means such as a high-frequency heating means, a far-infrared heater, or an oil heater may be used in combination. However, in the present invention, it is also possible to configure so that the elastic member is cut only by pressing.

In FIG. 1, it is also possible to adopt a configuration in which the positions of the embossing heat roll 950 and the opposing roll 960 are reversed.

(B) Lower sheet 910, upper sheet 930
It is preferable that either of them is heat-fusible. Non-woven fabrics, plastic films, knits, wovens, papers and the like can be used. As the material, known materials such as polypropylene, polyethylene, polyester, cellulose, rayon and the like can be used alone or in combination of two or more.

(C) Each of the sheets 910 and 930 may be a multilayer sheet in which some sheets are already laminated. In this case, the uppermost surface of the lower sheet 910 or the upper sheet 9
It is necessary to provide a heat-fusible sheet on the lowermost surface side of 10.

(D) As the elastic member of the present invention, a material that can be melted and cut (for example, thermoplastic polyurethane, various elastomers, rubbers, etc.), for example, a thread, band, sheet, or net is used. It is possible. An elastic member whose melting point is lower than the melting points of the heat-fusible materials of the upper and lower sheets is selected so as not to cut the sheet. In the above example, the elastic members are attached in parallel in a plurality of directions. However, in the present invention, only one elastic member can be attached.

(E) FIG. 1 shows an example in which the elastic member is bonded to the center of the sheet in the width direction. However, a structure in which the elastic member is bonded to the vicinity of the end of the sheet may be used. What is necessary is just to change the arrangement | positioning part of an embossing pattern according to the attachment position of an expansion-contraction member.

(F) The adhesive of the present invention can be applied to one or both of the upper and lower sheets. Further, an adhesive can be applied to the elastic member. Further, the adhesive may be applied to the sheet or the like discontinuously (see FIG. 1) or continuous (see FIG. 2) along the longitudinal direction, or partially, entirely or partially except for the whole. it can.

(G) As shown in FIG. 8, the cut portion in the present invention may be the adhesive applied portion X or the adhesive non-applied portion Y.

(H) In the above example, the form in which the elastic member is sandwiched between the pair of upper and lower sheets is shown. However, as shown in FIG.
The method for cutting an elastic member according to the present invention can be applied to a case where the elastic member is arranged and fixed on a single sheet or a multilayer sheet.

The effects of the above embodiment are summarized as follows. That is, since the embossed heat roll having the staggered projections or the embossed heat seal having the lattice-shaped projections is used, the extensible member is always cut at the time of heat sealing by any of the projections.

In the case of the staggered arrangement, a sheet which does not come into contact with the convex portion is not cut because the convex portion is spaced apart therefrom. Since the convex portion is small, the sheet which comes into contact with the convex portion is cut. Never. In the case of the grid-shaped arrangement, a thin grid-shaped seal portion is formed in a certain area, so that the touch feeling given to the wearer is soft, the appearance is beautiful, and sheet cutting is prevented.

Further, since no cutting force acts on the extensible members other than the protruding portions, there is a portion where the extensible member in the roll axis direction is not cut and a portion where the extensible member is cut. It is a sheet with less foreign matter feeling and good mounting properties.

Further, by adopting a configuration in which the non-applied portion and the applied portion are provided intermittently when applying the hot melt adhesive, it is possible to continuously manufacture a stretchable sheet having alternately stretchable portions and non-stretchable portions. Is preferable. In this case, there is an advantage that the non-stretchable portion can be joined by a seal.

When the stretchable sheet obtained by the present invention is used as a wearing article, the seal area is small, and the seal portions are staggered apart from each other or formed in a lattice having spaces, so that the appearance is beautiful. In addition, there is an advantage that the wearer does not feel discomfort such as pain.

Next, an application example to a disposable diaper will be described in detail with reference to an example of a pants-type disposable diaper. In the present invention, when the diaper is used (when worn), the left and right side edges of the abdomen and the left and right side edges of the back are used. The present invention can also be applied to a so-called tape-type disposable diaper of a type in which a diaper is bonded.

<Example of Configuration of Disposable Diaper> FIG. 9 shows a flexible outer sheet 1 and an absorbent body 10 fixed to the inner surface of the outer sheet 1 and extending in the front-rear direction (longitudinal direction) around the crotch 4. 1 shows a pants-type disposable diaper mainly composed of the following.

The outer sheet 1 is formed by laminating and fixing two air-permeable and water-repellent nonwoven fabrics.
In the final stage of the manufacturing process after superimposing the “0” and “0”, the entire longitudinal direction of both side edges of the front body F and the back body B is joined by means such as ultrasonic sealing or heat melting (this joining part is denoted by a symbol 30), a waist opening and a pair of left and right leg openings are formed.

As shown in FIG. 7, the absorbent main body 10 is made of a non-woven fabric or the like, and has a rectangular liquid-permeable top sheet 11 that directly touches the wearer's skin. Absorber AB consisting of an absorbent core 13 and a rectangular crepe paper 14 wound around the entire upper and lower surfaces of the absorbent core AB. And a rectangular liquid-impervious back sheet 12 made of a polyethylene plastic film or the like, which are bonded together by a hot melt adhesive (indicated by * in the figure are the bonded portions). If necessary, a liquid-permeable second sheet 11S can be interposed between the liquid-permeable topsheet 11 and the crepe paper 14 as shown.

The absorbent main body 10 is bonded to the outer sheet 1 with a hot-melt adhesive so that almost the entire back surface thereof is integrated with the liquid-impervious back sheet 12 except for a few side portions.

On both sides of the absorbent main body 10, standing leg cuffs B, B projecting toward the use surface side are formed, respectively.
The upright cuff B is composed of an upright sheet 40 substantially continuous in the width direction, and one or more stretchable members 50, 50... I have.

More specifically, the upright cuff B is formed by doubling the upstanding sheet 40, and each of the elastic members 50, 50.
Is wrapped in a state of being fixed with a hot melt adhesive or the like. It is desirable that the erecting sheet 40 forming each of the erecting cuffs B, B is not liquid-permeable but liquid-impermeable or hydrophobic. Further, the liquid-permeable sheet may be made to have a property of repelling liquid by silicon treatment or the like.

The inner surface of the double erecting sheet 40 is fixed to the surface of the liquid-impermeable back sheet 12 that is wrapped around the surface of the absorber AB with a hot melt adhesive or the like. As a result, the fixing start end of the inner surface of the double standing sheet 40 to the liquid-impermeable back sheet 12 is formed by the standing cuff B
Is formed.

The inner side of the upright end is a free portion that is not fixed to the product main body, and is functionally provided with an upright portion B1 directed toward the center of the product and a flat contact portion B2 that is turned upside down and turned outward. And conceptually.

On the other hand, at the front and rear ends in the longitudinal direction, a portion corresponding to the upright portion (the upright portion B) is applied with a hot melt adhesive or the like.
The extended portion B11 is fixed to the article, specifically, to the outer surface of the liquid-permeable sheet 1 in a state toward the center side of the article, and the portion corresponding to the flat contact portion (extended portion of the flat contact portion B2) B22 is fixed. It is fixed on the standing portion corresponding portion B11 in a folded state.

.. Have a basic configuration in which at least one of the elastic members 50 is at the flat contact portion B2. In particular, the elastic member 50 is preferably at the tip of the flat contact portion B2. The elastic member 50 is also provided on the upright portion B1.
It is preferable to have The optimal configuration is near the standing end,
That is, it is in the vicinity of the turning back and at the tip of the plane contact portion B2. It is more desirable to have a plurality of the tip portions of the flat contact portion B2 as shown in the drawing. The upright portion B1 may be further provided with elastic members 50, 50,... In order to increase the upright force. In the illustrated embodiment, there are a total of seven, four in the upright portion B1 and three in the flat contact portion B2.

FIG. 9 shows the inside of the disposable diaper in a state where the disposable diaper is unfolded in the longitudinal direction. When the disposable diaper is attached to the body in a boat shape at the time of attachment, each of the elastic members 50, 50.
As the contraction force of
As shown in FIG. 10 around the legs, each of the elastic members 50, 50
The upright cuff B rises due to the contraction force of. At this time, the side portion of the absorption main body 10 is deformed and lifted, and the absorber 3 is also lifted while being slightly deformed to form a deep pocket space.

Moreover, in this raised state, the contracting force of each of the elastic members 50, 50,... Acts on the standing cuff B itself, so that the standing portion B1 stands almost vertically. The flat contact portion B2 also rises vertically, but the flat contact portion B22 is fixed on the rising portion corresponding portion B11 in a state where the flat contact portion B22 is turned upside down. The portion B2 stands up while maintaining the upright force in the vertical direction while maintaining the outward state. As a result, the flat contact portion B2 always fits flat around the wearer's leg.

The space surrounded by the standing portions B1, B1 forms a space for confining urine or loose stool. When urine is discharged into this space, the urine is absorbed into the absorbent element AB through the liquid-permeable top sheet 1, and the rising portions B1, B1 of the rising cuff B are barriers for soft stool solids. And the overcoming is prevented. In the unlikely event that urine leaks laterally beyond the standing distal edge of the standing portion B1,
The side leakage is prevented by the stop function of 2.

Further, in this embodiment, the lifting telescopic member 60 along the longitudinal direction is fixed in an extended state at the center side of the upright end and on both side positions of the absorber AB.

In the illustrated embodiment, the lifting elastic member 60 is interposed between the liquid-impermeable back sheet 12 and the absorber AB. Then, as shown in FIG. 9, the position in plan view is the absorption core 1
3 does not overlap with the constricted portion, and is located at a position overlapping with the overhang portion of the absorbent core 13 in the longitudinal direction.

By providing the lifting elastic member 60, as shown in FIG. 10, when the product is mounted, the absorbing body AB is actuated by the contracting force of the lifting elastic member 6 (the operating state is indicated by a white arrow). Are deformed and stand up toward the wearer's skin. The upright cuffs are added to the upright portions on both sides of the absorber AB via the upright ends outside the lifting elastic member 60 with respect to the upright portions, so that the upright heights with respect to the skin are raised. Is high, that is, a deeper pocket space is formed, the fit to the skin is enhanced, and lateral leakage can be reliably prevented only by the standing cuff B alone.

On the other hand, in the front body F and the back body B, between the non-woven fabrics of the outer sheet 1 and the folded back portions at the front and rear ends of the back side sheet of the outer sheet 1, to improve the fit around the waist, A waist elastic member 20 made of thin thread rubber and spaced in parallel with the edge of the waist opening;
Are arranged and fixed under extension so as to expand and contract.
The distance and the number of the waist elastic members 20, 20,... Can be determined as appropriate, for example, the distance is 4 to 6 mm.
The number and the number are preferably about 5-7.

Further, lower abdomen elastic members 21F, 21F are provided in a portion corresponding to the lower abdomen of the front body F along a waist tightening direction (a direction parallel to the edge of the waist opening; the same applies hereinafter), and Buttocks elastic member 21B at the buttocks of back body B corresponding to the lower abdomen,
Is provided. These lower abdomen elastic members 21F, 21
F and the buttocks elastic member 21B are provided by the elastic sheet of the present invention. In the figure, X indicates a first roll 950 having a plurality of protrusions arranged on the surface and a first roll 950 sandwiching the above-mentioned single or plural elastic members 920 in an extended state to form a laminate. The laminate is passed between a second roll 960 and an elastic member 920 of the laminate.
Is cut by at least one of pressing and heating between the convex portion 952 of the first roll 950 and the second roll 960.

The lower abdomen elastic members 21F, 21F of this example are
The portion X corresponding to the central portion of the absorber AB in the portion from the joint 30 on one side to the joint 30 on the other side in the front body F is formed discontinuously by the cutting according to the method of the present invention described above. I have. On the other hand, the buttocks elastic member 21B is continuously provided from the joint 30 on one side to the joint 30 on the other side in the back body B, as in the related art. Further, the side ends of the lower abdomen elastic members 21F, 21F opposite to the discontinuous side are continuous with both ends of the buttocks elastic member 21B.

In the illustrated example, these lower abdomen elastic members 21F
As the buttocks elastic member 21B, 9 to 25 pieces are arranged in parallel in both the front body F and the rear body B between the nonwoven fabrics of the outer sheet 1 under the extension so that the elastic member made of thin thread rubber expands and contracts. Fixed. The distance between the lower abdominal elastic member 21F and the buttocks elastic member is the same as or shorter than the distance between the waist elastic members 20, 20,.

The rubber thread used as the lower abdomen elastic member 21F and buttocks elastic member 21B has a smaller tensile stress and a substantially smaller outer diameter than the thin rubber thread used as the waist elastic member 20 described above. Can be the same. Although it is possible to simply cope with using the same thread rubber for both, it is also possible to achieve differentiation by using characteristics other than the above-mentioned characteristics such as color coding. As the fine thread rubber used here, specifically, those having an elongation stress in the range of 4 to 17 g, particularly 5 to 10 g at the time of 150% elongation, are preferably used, and the cross-sectional outer diameter is 100 to 100 g. 350 μm range, especially 120-270 μm
Those in the range are preferably used.

Thus, as can be seen from FIG. 12 showing the front side of the diaper, a part of the absorbent body AB in the front body F from the one joint part 30 to the other joint part 30 is not suitable. Due to the continuous formation, the lower abdomen elastic members 21F, 21F are not continuous across the absorber AB in the front body F, and the contraction force of the waist around the absorber AB in the direction of tightening around the waist is weakened. As a result, the problem that the absorber rises from the skin due to vertical wrinkles formed along the waist tightening direction due to the action of the elastic member that traverses the absorber AB as in the conventional case, and leakage from the waist portion is prevented. Is done. Also, in this example, the buttocks elastic member 21B
Is a joint 30 on one side of the back body B as in the prior art.
To the joint 30 on the other side, it is possible to prevent slippage and to improve the adhesion to the skin to the same degree as in the conventional example. In addition, since the lower abdominal elastic members 21F and 21F in the front body F have almost no wrinkles at discontinuous portions, the adhesiveness to the pants worn from above becomes good, and the appearance becomes clear and good. Although not shown, the lower abdomen elastic member 21 of the present invention is not shown.
F, 21F can also form discontinuously all the portions of the absorber AB in the portion from the joint 30 on one side to the joint 30 on the other side in the front body F. Similar effects can be obtained.

On the other hand, FIG. 13 shows another embodiment of the disposable diaper, in which a rectangular main body outer sheet 1A slightly wider than the absorbent main body 10 and a front body waist forming a front body part excluding the crotch part 4 are shown. The seat 1B and a back body waist sheet 1C forming a back body portion excluding the crotch portion 4 are laminated and fixed.

A plurality of waist elastic members 70F and 70B are arranged and fixed to the outer peripheral sheet 1A of the main body outer sheet 1A at both ends constituting the waist opening at an interval parallel to the ends thereof. A number of elastic members 71F, 71F that are continuous in the product width direction are attached to the respective side portions of the front body waist sheet 1B under extension, and the elastic members 71F, 71F corresponding to the side portions are attached. Mutually, they are discontinuous. On the other hand, back body waist sheet 1C
In, the expansion and contraction member 71F is arranged and fixed so as to continuously extend from the joint on one side to the joint on the other side. The portion of the elastic member 71F that is continuous with the waist elastic member constitutes a part of the waist elastic member of the present invention both functionally and conceptually.

In the above example, the lower abdomen elastic member is formed discontinuously and the buttocks elastic member is formed continuously. Conversely, the lower abdominal elastic member is formed continuously from the one joint to the other joint. And the buttocks elastic member is formed discontinuously in part or all of the absorber in the portion from the one-side joint to the other-side joint, or as in the example below, the lower abdomen and the buttocks Both of the elastic members may be formed discontinuously in part or all of the absorber from the part from the one-side joint to the other-side joint.

(Other Examples) In the above example, the elastic sheet of the present invention was used for providing the lower abdominal elastic member and the buttocks elastic member. It can also be used for a part (for example, for providing a waist elastic member, a leg elastic member, etc.).

<Manufacturing Form of Disposable Diaper> Next, a method of using the stretchable sheet of the present invention will be described with reference to an example of a disposable diaper manufacturing method. FIG. 14 shows an assembling flow of the pants-type disposable diaper.
And an external sheet manufacturing / supplying / manufacturing line 200 and a final processing line 300.

In the absorption-based production supply line 100, first, an absorbent core is supplied so that the longitudinal direction thereof is along the conveying direction, and a liquid-permeable top sheet is covered thereon and fixed. Upright cuffs are respectively arranged and fixed to both side ends of the top sheet. Next, these are arranged and fixed on a separately supplied liquid-impermeable backsheet, and the absorption main body 10 is completed. In the case of this example, the liquid-impervious back sheet is folded back in advance on both sides and bonded with a reinforcing member such as a colored urethane film sandwiched therebetween, and processed so as to strengthen the stiffness of the edge. (The side edges may be emphasized or stiffened by color hot melt bonding without using a reinforcing member.)

The absorption main body 10 thus manufactured is 90
In the turn device 110, the sheet is turned 90 degrees in a plane such that the longitudinal direction thereof is orthogonal to the conveying direction, and the outer sheet mounting device 301 of the final line 300 is turned.
Transported to

On the other hand, in the outer sheet manufacturing / supplying / manufacturing line 200, the lower abdomen elastic member and the buttocks elastic member,
In addition, the waist elastic member is attached.

More specifically, the belt-shaped outer sheet 201 is first sent to the slip cutter device 210. In the slip cutter device 210, the separately supplied design sheet 202 is slipped and sequentially cut into a predetermined shape while keeping a supply interval, and as shown in FIG. 16, the cut design sheets 202 and 2 are cut.
Reference numeral 02 is arranged and fixed to the center of the front body width direction and the center of the rear body width direction on the upper surface of the belt-shaped outer sheet 201 by hot melt bonding or the like. As the design sheet, a film or the like made of an impermeable material with a picture or the like can be used.

Subsequently, the lower abdominal elastic sheet and the buttock elastic sheet supplied from the waist elastic member supply line 230 are attached to the outer sheet 201, respectively. For this reason, in this example, the waist elastic member supply line 23 is used.
In the first roll 950, a single or a plurality of elastic members 920 are sandwiched between the upper and lower sheets in an extended state to form a laminated body, and a plurality of convex portions are arranged on the surface by the manufacturing method of the present invention described above. Between the first roll 950 and the opposing second roll 960, passing the laminate,
The elastic member 920 of this laminate is cut by at least one of pressurization and heating between the convex portion 952 of the first roll 950 and the second roll 960, and the portion to be overlapped with the absorber is discontinuous. Continuous elastic sheet 20
6 for the lower abdomen and one for the buttocks. In addition,
For the production of elastic sheets for lower abdomen and buttocks,
An individual line may be provided, or one manufactured on one line may be divided into two in the longitudinal direction.

The continuous stretchable sheet 206 for the lower abdomen and buttocks manufactured in this way is continuously attached to a predetermined portion of the outer sheet 201 at the front and rear sides by hot melt adhesive or the like.

Next, the outer shape sheet 201 to which the continuous elastic sheets for the lower abdomen and the buttocks are pasted is sequentially sent to the die cutter device 320, where the leg opening 2 is formed.
After the portion corresponding to 06 is pierced, a continuous waist elastic member 203 is continuously supplied to a predetermined portion of each body (for example, a plurality of materials such as thread rubber and band-shaped rubber are spaced apart at intervals). (Supplied in parallel) and fixed by hot melt bonding. The elastic sheet of the present invention can be used as the waist elastic member.

The outer sheet 20 to which the above-mentioned members are attached is provided.
1 is the outer sheet mounting device 3 of the final line 300
It is sent to 10. Here, the absorption main body 10 separately fed is disposed at a portion corresponding to the center portion of the external sheet 201 in the product width direction, and is fixed by hot melt bonding or the like.

The external sheet 201 on which various members have been mounted is folded by the folding device 330 so that the side edges 30, 30 of the front body F and the back body B overlap each other. After the side edges 30 and 30 are heat-sealed, the surplus portion left for transportation in the final cutter 350 is cut off to form a portion corresponding to the waist opening edge, and the continuous products are separated from each other by the side edges. The diaper is cut along the corresponding part, and cut into individual diapers to fit the product dimensions. These individual diapers are transferred to a counting device (not shown) sequentially after a picture, a pattern, or the like is transferred to the surface of the outer sheet 201 by a transfer roll 360 as necessary.

As shown in the unfolded state (front side) in FIG. 15, the thus manufactured disposable diaper has one of the joints 30 on the front body F in the elastic members 205, 205 of the lower abdominal elastic sheets 206, 206. The portion 205X corresponding to the central portion in the width direction of the absorber among the portions from to the joining portion 30 on the other side is the method of the present invention described above, that is, the first roll 950 having a plurality of convex portions arranged on the surface, Between the first roll 950 and the opposing second roll 960,
The laminate is passed through, and the elastic member 920 of the laminate is brought into contact with the projection 952 of the first roll 950 and the second roll 96.
It is cut by at least one of pressurization and heating between 0 and is discontinuous. In addition, in the elastic members 205, 205 of the buttocks elastic sheets 206, 206,
The portion 205X corresponding to the central portion in the width direction of the absorber in the portion from the joint 30 on one side to the joint 30 on the other side in the back body B is also the method of the present invention described above, that is, a plurality of convex portions on the surface The first roll 950 arranged and the first roll 950
Between the rolls 950 and the second roll 960 facing each other, and passes through the elastic member 920 of the laminate.
Is cut by at least one of pressurization and heating between the convex portion 952 of the first roll 950 and the second roll 960, and is discontinuous.

The lower abdomen elastic members 205, 2 of the present invention
05 and the buttocks elastic members 205, 205 can be made discontinuous by cutting only the elastic member of the present invention at the portion corresponding to the entire width direction of the absorber.

On the other hand, by omitting the cutting of the elastic member of the elastic sheet for the buttocks, only the elastic member of the buttocks similar to that shown in FIG. The disposable diaper can be continuously arranged and fixed to the edge.

[0097]

As described above, according to the present invention, it is possible to cut the elastic member without fear of breaking the sheet.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing another embodiment of the present invention.

FIGS. 3A and 3B are front explanatory views showing an embossed heat roll and an opposing roll.

FIGS. 4A and 4B are explanatory diagrams showing examples of embossed patterns in a staggered arrangement.

FIG. 5 is an explanatory diagram showing a cutting state of the elastic member.

FIG. 6 is an explanatory view showing a cutting mode of a rhombus convex portion.

FIG. 7 is an explanatory diagram showing an example of a lattice-shaped emboss pattern.

FIG. 8 is an explanatory longitudinal sectional view showing an embodiment included in the present invention.

FIG. 9 is an expanded plan view of the first mode of the pants-type disposable paper diaper.

FIG. 10 is a view taken along line 2-2 of FIG. 1;

11 is a part corresponding to a cross section taken along line 2-2 of FIG. 1 in a product state.

FIG. 12 is a plan view of the front side deployed state.

FIG. 13 is a plan view showing a developed state (front side) of another example.

FIG. 14 is a flowchart of a diaper manufacturing line.

FIG. 15 is a plan view showing a developed state (front side) of the disposable diaper manufactured by the flow of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Lower sheet, 11 ... Adhesive application part, 12 ... Adhesive non-application part, 20 ... Elastic member, 21 ... Guide, 30 ... Upper sheet, 31, 32 ... Press roll, 50 ... Emboss heat roll, 51 ... Embossed portion, 52: convex portion, 60: opposing roll.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Sadanazu Manabe 4765-11 Samukawa-cho, Iyo Mishima City, Ehime Prefecture F-term (reference) 3D029 BD10 BD13 BF07 4C098 AA09 CC12 DD10 DD22 DD23

Claims (8)

[Claims] 1. A single or a plurality of elastic members such as a thread, a net, and a sheet are arranged in an extended state on a sheet or between upper and lower sheets to form a laminate, and a plurality of convex portions are arranged on the surface. A first roll and this first roll
The laminate is passed between a second roll and a second roll opposed to the first roll, and the elastic member of the laminate is pressed and heated between the convex portion of the first roll and the second roll. Cutting by at least one of the above methods. 2. A method according to claim 1, wherein one or a plurality of filaments are provided between the upper and lower sheets.
A first roll in which a stretchable member such as a net or a sheet is sandwiched in a stretched state to form a laminate, and a first roll having a plurality of convex portions arranged on the surface;
The laminate is passed between a second roll and an opposing second roll, and the expansion and contraction member of the laminate is pressed and heated between the convex portion of the first roll and the second roll. Cutting by at least one of the above methods. 3. The method according to claim 1, wherein an adhesive is applied to at least one of the upper and lower sheets, and the elastic member is sandwiched between the upper and lower sheets and adhered. 4. The first roll has a length of 1 to 25 m.
m, the convex portion having a width of 0.5 to 15 mm is 1 mm in the axial direction of the roll.
The stretchable sheet according to any one of claims 1 to 3, wherein a plurality of the rolls are arranged in a plurality of rows every 25 mm, and a plurality of rows of the convex groups are arranged in the circumferential direction of the rolls. Production method. 5. The roll according to claim 1, wherein the first roll is a roll in which the protrusions are arranged in a staggered manner, or a roll in which the shape of the protrusions is a lattice, a line, or a rhombus.
5. The method for producing a stretchable sheet according to any one of 4. 6. An adhesive is applied to at least one of the sheet and the elastic member continuously or discontinuously in the longitudinal direction, or partially, wholly or partially except for the whole. Item 6. The method for producing a stretch sheet according to any one of Items 1 to 5. 7. The method for manufacturing a stretchable sheet according to claim 1, wherein all or a part of the stretchable member is cut when cutting the stretchable member. 8. A disposable diaper comprising a stretchable sheet produced by the method according to any one of claims 1 to 7 attached to a stretchable portion.