JP2011225000A - Method of manufacturing stretchable paper sheet, and disposable diaper employing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a stretchable paper sheet, capable of cutting of a stretchable member without risk of sheet breakage, and also capable of improving air permeability.SOLUTION: The method of manufacturing the stretchable sheet is characterized as follows. A plurality of threadlike stretchable members 920 are arranged parallel at intervals between upper and lower sheets 910 and 930 in the stretched state to make a laminate 940. The laminate 940 is passed through between a first roll 950 having a surface on which many cutting protrusions 951 are formed, and a second roll 960 facing the first roll 950, while the laminate 940 is stabbed with the cutting protrusions 951. Hence, at least some of the plurality of stretchable members 920 are cut in at least part of their longitudinal direction, and a processing of hole forming of the sheet is performed.

Description

  The present invention relates to a method for manufacturing a stretchable sheet by attaching a stretchable member made of an elastic material such as thread rubber to a sheet such as a nonwoven fabric or a plastic film, and a paper diaper using the stretchable sheet produced by this method It is.

Disposable wearing articles such as disposable diapers and disposable pants are required to be able to expand and contract around the waist, around the legs, around the torso, etc., in order to improve the adhesion to the wearer. Although it is conceivable to use a woven fabric (stretch fabric) in which the material itself has a stretching force, it is expensive to use for disposable wearing articles. For this reason, usually, a thread-like or belt-like stretchable member is bonded to a nonwoven fabric or a plastic film in a stretched state so that these non-stretchable sheets can be stretched.
In order to continuously manufacture such a stretchable sheet, the stretchable member is unwound from the roll and applied with a predetermined tension to the nonstretchable sheet while the nonstretchable sheet is unrolled from the roll. The method is adopted. However, there is a case where a portion that does not need to be stretched and a stretchable portion need to be intermittently provided in the traveling direction of the seat due to the form of the disposable wearing article or the convenience of cutting into individual products.
For parts that do not need to be expanded and contracted, it may be possible to apply the tension to the sheet without applying tension to the expansion / contraction member, but it is possible to quickly switch between the tensioned state and the state where no tension is applied. It is difficult.
Therefore, usually, the adhesive is intermittently applied to the sheet, the adhesive application portion and the non-application portion are alternately provided on the sheet along the sheet running direction, and the elastic member present in the adhesive non-application portion is cut. In some cases, a non-stretchable part is provided. In the adhesive non-applied part, since the elastic member is not bonded to the sheet, the elastic member cut at one place is pulled toward the elastic member bonded to the sheet to relax and stay there. .
As a method of cutting the elastic member, the elastic member is provided between the first roll having a continuous linear convex portion (single blade) continuous along the roll width direction and the second roll facing the first roll. There is one that attempts to cut the elastic member by passing the arranged sheet and applying pressure or heating by the linear convex portion of the first roll.

However, in this conventional method, since the cutting force is applied in a continuous line shape along the roll width direction, the sheet may be broken when the cutting force is applied to a portion where the elastic member does not exist. It was. In addition, even when the sheet does not reach breakage, a sheet of nonwoven fabric or the like is formed into a film by thermocompression bonding, so that one seal line with a hard tactile sensation remains across the portion where the elastic member does not exist. When this was done, there was a problem that both the appearance and the feeling of wearing were insufficient.
On the other hand, when such an elastic sheet is used on the outer sheet of the paper diaper or as the outer sheet itself for the purpose of imparting elasticity to the paper diaper, it is desirable that the air permeability is good.
Therefore, a main problem of the present invention is to enable processing for cutting an elastic member and improving air permeability without fear of sheet breakage.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
On the sheet or between the upper and lower sheets, a plurality of thread-like elastic members are arranged in a stretched state in parallel and spaced apart to form a laminate,
Between the first roll formed with a large number of cutting protrusions on the surface at intervals in the roll axial direction and the circumferential direction, and the second roll facing the first roll,
Passing through the laminate and, at that time, cutting the projecting protrusions into the laminate, cutting at least a part in the longitudinal direction of at least some of the plurality of elastic members, and holes in the sheet A method for producing a stretchable sheet, characterized by performing a forming process.

<Action>
In the present invention, a plurality of cutting projections arranged at intervals are inserted into the laminate to cut the elastic member. Therefore, in the processing, the cutting force does not act between the convex portions and the convex portions, and the cutting force does not act in a continuous line shape along the roll width direction (axial direction). However, there is no risk of sheet breakage (cutting in the entire roll width direction). And when cutting an expansion-contraction member, since a cutting convex part is stabbed into a laminated body, an expansion-contraction member can be cut | disconnected more reliably.
It should be noted that both the cutting of the elastic member and the formation of holes in the laminated body can be performed by piercing the cutting projection.
In this case, the elastic member can be more reliably cut without fear of sheet breakage, and at the same time, air permeability can be improved by forming a hole.

<Invention of Claim 2>
An outer sheet,
A paper diaper that is fixed to the inner surface of the outer sheet and has an absorbent main body that extends in the front-rear direction around the crotch,
On the sheet or between the upper and lower sheets, a plurality of thread-like elastic members are arranged in a stretched state in parallel and spaced apart to form a laminate,
Between the first roll formed with a large number of cutting protrusions on the surface at intervals in the roll axial direction and the circumferential direction, and the second roll facing the first roll,
Passing through the laminate and, at that time, cutting the projecting protrusions into the laminate, cutting at least a part in the longitudinal direction of at least some of the plurality of elastic members, and holes in the sheet While performing a forming process to obtain an elastic sheet,
A paper diaper characterized in that a cutting and hole forming region of the elastic member of the elastic sheet corresponds to a partial region substantially corresponding to the entire width direction of the absorbent core having a certain degree of rigidity of the paper diaper.

<Action>
The same effects as in the first aspect can be obtained.
In addition, since the cutting and hole forming region of the elastic member of the elastic sheet corresponds to the partial region corresponding to substantially the entire width direction of the absorbent core having a certain degree of rigidity of the paper diaper, the elastic member crosses the absorbent core. Therefore, the contraction force in the direction of tightening the waist around the absorbent core is weakened, and downpipe and the resulting decrease in absorption performance are prevented. Further, the air permeability is improved by forming a large number of holes.

<Invention of Claim 3>
The paper diaper consists of a waist part, a lower waist part, a crotch part in order along the front-rear direction,
In the lower waist, cutting of the elastic member and hole forming processing are performed,
The disposable diaper according to claim 2, wherein the waist portion is not subjected to cutting of the elastic member and hole forming processing.

<Action>
By cutting the elastic member and forming holes in the lower waist, the contraction force in the direction of tightening the waist around the absorbent core is weakened, and the vertical hook and the resulting decrease in the absorption performance are prevented. Further, the air permeability is improved by forming a large number of holes.
Further, since the elastic member is not cut at the waist, the fit around the waist can be enhanced.

  As described above, according to the present invention, it is possible to perform processing for cutting the stretchable member and improving air permeability without fear of sheet breakage, and improve air permeability.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
<Embodiment of stretch sheet manufacturing method>
In FIG. 1, the perspective explanatory drawing of the example of the manufacturing method of the elastic sheet of this invention which concerns on the 1st form was shown. The arrow direction is the seat traveling direction.
A belt-like lower sheet 910 having a predetermined width travels from the right side to the left side in the figure while an adhesive application part 911 and a non-application part 912 are alternately provided by a hot melt adhesive application machine (not shown). Yes. In the present invention, as shown in FIG. 2, the adhesive 911 can be continuously applied in the longitudinal direction of the sheet.

  The plurality of elastic members 920 and 920 are fed from the elastic member roll, and are attached to the lower sheet 910 while being guided by the guide guide 921 in a state where a predetermined tension is applied by passing through the tension roll. . At this time, the elastic member 920 is sandwiched between the upper sheet 930 and the lower sheet 910 and passed between the press rolls 931 and 932 so that they are pressure-bonded, and in the adhesive application unit 911, the upper sheet 930, the lower sheet 910, and The elastic member 920 is adhered. Thus, a laminate 940 is formed in which the elastic member 920 is sandwiched between the upper and lower sheets 930 and 910.

  Subsequently, the laminated body 940 includes a first roll 950 having a plurality of cutting projections 951 arranged on the surface at intervals, and a second roll 960 having a recess 961 into which the cutting projections 951 are inserted. The elastic member 920 is cut and a hole is formed in the laminated body by inserting the cutting projection 951 into the laminated body 940 and inserting the cutting projection 951 into the laminated body 940.

In this example, the first roll 950 has an overhanging surface 952 provided at a part in the circumferential direction so as to cut the elastic member 920 and form the hole X at an appropriate interval in the transport direction of the laminate 940. Only in contact with the outer peripheral surface of the second roll 960, and the cut convex portion 951 is formed only on the overhanging surface 952. Therefore, as shown in FIG. 3A, in the state where the overhanging surface 952 is not opposed to the second roll, the first and second rolls are separated from each other, and the elastic member is not cut and the hole is not formed. When the overhanging surface 952 comes to a position facing the second roll as shown in FIG. 3B due to the rotation of both rolls, the overhanging surface 952 of the first roll 950 comes into contact with the second roll, At that time, as shown in FIG. 4, the cut projection 951 on the overhanging surface 952 is pierced into the laminate 940, and the elastic member 920 is cut and the hole X is formed. At this time, when the concave base end portion 962 of the second roll is formed in a tapered shape whose diameter is increased toward the opening side as shown in the drawing, there is an advantage that the hole is more reliably and neatly formed. In the example shown in FIG. 1, the circumferential length L ₂ of the overhanging surface is formed slightly shorter than the length L _{1 of} the adhesive non-application portion 912, and the overhang surface 952 is formed in the adhesive non-application portion 912. The coating interval, the circumferential length of the first roll 950, and the traveling speed are set so as to make contact.

  As shown in FIG. 5A, the formed hole X may be a through-hole X1 that penetrates to the back surface, or a non-penetrated hollow X2 as shown in FIG. 5B. It may be. It is recommended that the depth of the hollow X2 be 30% or more, preferably 50% or more, more preferably 70% or more with respect to the thickness of the laminate. Unlike the conventional embossing such as diamond embossing, by providing a hollow hole of 30% or more with respect to the thickness of the laminated body 940, it exhibits a remarkable air permeability in terms of functionality. The hole shape is preferably a circular shape, but may be a polygonal shape such as a star shape, a triangular shape, or a quadrangular shape.

Actually, the clear through hole X1 or the hollow X2 may not be formed due to the restoring force of the fiber. However, as shown in an experimental example to be described later, by performing such hole processing, the air permeability is clearly improved. It will be expressed. The hole processing is preferably performed at a pitch of 1 to 25 mm, and the hole area is preferably 0.01 mm ² or more on the laminate surface.

  On the other hand, as shown in FIG. 6, the shape of the cutting projection 951 of the first roll 950 is (A) conical pin shape 951, (B) polygonal pyramid pin shape 951 ′, and (C) linear at the tip. Any shape can be used as long as it can pierce the laminated body, such as the linear convex portion 951 ″ having the blade portion C. Further, as shown in FIG. 4, the cutting projection 951 is formed so that the area of the piercing base end face 951S is equal to the desired hole area.

Further, the cutting projections 951 can be arranged in a matrix, but it is preferable to arrange them in a staggered manner as shown in FIG. In this case, the circumferential and axial pitches M and D of the roll are made equal to the desired hole pitch. Note that the number of the convex portions 951 in one row is preferably set as appropriate depending on the number of elastic members to be cut. The number of rows in the circumferential direction of the convex portions 951 can be appropriately set according to the length L ₁ of the adhesive non-application portion. In particular, it is preferable to determine the size and arrangement of the convex portions 951 so that the convex portions 951 in the circumferential front and rear rows overlap the gaps between the convex portions 951 and 951 in each roll axis direction row in the circumferential direction. Failure to cut the telescopic member 920 is substantially eliminated.

A more detailed cutting mode when this staggered arrangement is employed is shown in FIG. In the figure, it is assumed that the laminate is traveling downward. Reference numeral 911 denotes an adhesive application portion, and 912 denotes an adhesive non-application portion. The left expansion / contraction member 922 is cut at the nearest convex portion corresponding portion 970 (corresponding to the convex portion 951), and its end portion 922a is released from the tension state and is bonded and fixed to the sheet. Shrinks toward. If the remaining elastic member is captured by the convex corresponding part 972 before the cutting by the convex corresponding part 970 is completed, the elastic member 922b existing between the convex corresponding part 970 and the convex corresponding part 972 becomes the convex part. At the time of cutting by the corresponding portion 970, the convex portion corresponding portion 972 contracts. If the cutting by the convex portion corresponding part 970 is completed before the remaining elastic member is captured by the convex portion corresponding portion 972, the elastic member (not shown) existing in the downstream adhesive application portion It will shrink toward. Further, the right elastic member 923 is also cut at the nearest convex portion corresponding portion 971, and the end portion 923a contracts.
In the stretchable sheet thus formed, not only the stretchable member is surely cut by the piercing of the cutting projection, but also the air permeability is good by forming a through-hole or a recessed hole.

On the other hand, in the present invention, the following modifications (a) to (h) are possible.
(A) At least one of the first and second rolls 950 and 960 may be provided with a heating means so that the elastic member is melted and the upper and lower sheets are sealed. Specifically, a rod-like sheathed heater may be provided in the vicinity of 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, since cutting projections such as pins and blades are used in the present invention, the elastic member can be cut only with light pressure, and in that case, flexible elasticity without heat sealing of the upper and lower sheets Sheets can be manufactured.
In FIG. 1, a configuration in which the positions of the first roll 950 and the second roll 960 are reversed can also be employed.
(B) As the lower sheet 910 and the upper sheet 930, a nonwoven fabric, a plastic film, a knitted fabric, a woven fabric, paper, or the like can be used. As the material, a known material such as polypropylene, polyethylene, polyester, cellulose, rayon or the like can be used alone or in admixture of two or more.
(C) Each of the sheets 910 and 930 may be a multilayer sheet in which several sheets are already laminated.
(D) As the elastic member of the present invention, a severable material (for example, thermoplastic polyurethane, various elastomers, rubbers, etc.), for example, thread-like, belt-like or net-like can be used.
(E) Although FIG. 1 shows an example in which the stretchable member is bonded to the central portion in the width direction of the sheet, it is needless to say that the stretchable member may be bonded to the vicinity of the end of the sheet. What is necessary is just to change the arrangement | positioning part of an emboss pattern according to the attachment position of an expansion-contraction member.
(F) The adhesive in the present invention can be applied to either one or both of the upper and lower sheets. Also, an adhesive can be applied to the elastic member. Furthermore, the adhesive may be applied to the sheet or the like discontinuously (see FIG. 1) or continuously (see FIG. 2) along the longitudinal direction, or entirely except a part, all or part of the sheet. it can.
(G) As shown in FIG. 9, the cutting site in the present invention may be the adhesive application part X or the adhesive non-application part 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, but as shown in FIG. 9, the present invention can be applied to the case where the elastic member is arranged and fixed on one sheet or a multilayer sheet. It is possible to apply an elastic member cutting method.
(I) The above example cuts the elastic member, but in the present invention, the arrangement of the cut projections is changed to form the hole in the laminate without cutting the elastic member, and only the air permeability is improved. You can also plan.

Next, an example of application to a disposable diaper will be explained in detail by taking an example of a pants-type disposable diaper. Then, when using the diaper (when worn), bring the left and right edges of the back to the left and right edges of the stomach. An application example to a so-called tape type paper diaper of a type in which these are joined by a tape fastener (including an adhesive tape fastener and a hook-and-loop fastener) will also be described.
<Explanation of Terms of the Present Invention and First Embodiment of Pants-Type Disposable Diapers>
The pants-type disposable diaper according to the first embodiment will be described with reference to FIGS. 11 to 13 while mainly explaining the terms and directions of the present invention with reference to FIG.
As shown in FIGS. 10 and 11, the pants-type disposable diaper according to the first embodiment is fixed to the flexible outer sheet 1 and the inner surface of the outer sheet 1, and is longitudinally centered on the crotch 4 ( The main component is an absorption main body 10 extending in the front-rear direction.
The outer sheet 1 is formed by laminating and fixing two or three or more breathable / water-repellent nonwoven fabrics. At the final stage of the manufacturing process after the outer sheet 1 and the absorbent main body 10 are superposed, By joining the entire longitudinal direction of both side edges with the back body B by means such as ultrasonic sealing or heat melting (this joint is denoted by reference numeral 30), a waist opening as shown in FIG. WO and a pair of left and right leg openings LO are formed.

  In the code | symbol of FIG. 10, "vertical direction" means the direction which connects an abdominal side and a back side, and "circumferential direction" means the direction orthogonal to the said vertical direction. “Waist opening edge” means the edge of the waist opening WO, and “Leg opening edge” means the edge of the leg opening LO. The “leg opening start end” means a position where the leg opening edge of the leg opening LO intersects with the joint portion 30, and means a starting position of the leg opening edge. "Torso circumference part" T means the whole area | region of the length range from a waist opening edge to a leg opening start end. The waistline portion T can be conceptually divided into a “waist portion” W and a “lower waist” U. Although the length of these vertical directions changes with sizes of a product, the waist part W is 15-40 mm and the waist lower part U is 45-120 mm. “Crotch” L means the entire region of the length range that forms the leg opening LO. Further, the “center portion” means an intermediate region excluding the side portion including the center line of the product. The “side portions” mean both side portions of the waistline portion T.

  As shown in FIG. 12, the absorbent main body 10 is mainly composed of a rectangular liquid-permeable top sheet 11 made of a nonwoven fabric or the like that directly touches the wearer's skin and cotton-like pulp, and has a certain degree of rigidity (semi-rigid). ) Absorber AB composed of a rectangular absorbent core 13 and a rectangular crepe paper 14 wrapped around the upper and lower surfaces thereof, and a rectangle composed of a polyethylene plastic film etc. reaching the vicinity of both side edges on the back surface of the absorber AB. The liquid-permeable top sheet 11 wraps around the side edges of the absorber AB and reaches the back surface, and is superimposed on the liquid-impermeable back sheet 12. These elements are integrated by bonding with a hot-melt adhesive (indicated by * in the figure is the bonding portion). If necessary, a liquid-permeable second sheet 11S can be interposed between the liquid-permeable top sheet 11 and the crepe paper 14 as illustrated. The absorbent main body 10 is integrated by adhering almost the entire back surface to the outer sheet 1 with a hot melt adhesive.

Standing cuffs C and C around the legs projecting to the use surface side are formed on both sides of the absorbent main body 10, respectively. The standing cuffs C include a standing sheet 40 that is substantially continuous in the width direction, an elastic member, for example, It is composed of one elastic rubber member 50, 50 ... as shown in the figure.
In more detail, the standing cuff C is formed by doubling the standing sheet 40 and wrapping each of the elastic members 50, 50... With a hot melt adhesive or the like. The standing sheet 40 forming each standing cuff C, C is preferably not liquid-permeable but liquid-permeable or hydrophobic. For this reason, it is good also as a structure which sticks another sheet | seat (a film, a nonwoven fabric, etc.) on the inner surface of the standing sheet 40, and improves leak-proof property. Moreover, you may make it become a property which repels a liquid by a silicon process etc. with respect to liquid-permeable sheets, such as a nonwoven fabric. Furthermore, it is desirable to have air permeability or vapor permeability.

The inner surfaces of the double upright sheets 40 go around the back surfaces of the absorber AB and the liquid-impermeable back sheet 12 and are fixed by a hot melt adhesive or the like. As a result, the fixed start end of the double upright sheet 40 forms the upright end of the upright cuff C.
The tip side from the standing end is a free part that is not fixed to the product body.
On the other hand, at the front and rear end portions in the longitudinal direction, the free portion is fixed to the article, specifically to the outer surface of the liquid-permeable top sheet 11, with the tip thereof toward the center side of the article by hot melt adhesive or the like. Yes.

  Further, the basic configuration is that at least one of the elastic members 50, 50... Is in the free part, but the elastic member 50 is preferably in the tip of the free part, and is further shown in FIG. As shown, it is preferable to have the elastic member 50 also on the base side. It is further desirable to have a plurality of tip portions as shown in the figure.

  FIG. 11 shows a state in which the paper diaper is expanded in the longitudinal direction. When the paper diaper is mounted, since the paper diaper is mounted on the body in a boat shape, and the contraction force of each of the elastic members 50, 50. The standing cuff C is erected by the contraction force of each of the elastic members 50, 50. At this time, the side portion of the absorbent main body 10 is deformed and lifted, and the absorbent core 13 is also slightly lifted while being deformed to form a deep pocket space.

  The space surrounded by the left and right standing cuffs C, C forms a urine or soft stool confinement space. When urinating into this space, the urine is absorbed into the absorbent body AB through the liquid-permeable top sheet 11, and the rising cuff C becomes a barrier for the solid matter of loose stool, and the overpass is prevented. The

  On the other hand, at the longitudinal ends of the front body F and the back body B, between the nonwoven fabrics of the outer sheet 1 in the waist W, the gap is parallel to the edge of the waist opening WO in order to enhance the fit around the waist. The waist elastic members 20F and 20B made of thin thread rubber are placed and fixed under extension so that they extend. Although the space | interval and the number of waist elastic members 20F and 20B in the waist part W can be determined suitably, for example, about 4-8 mm is preferable as an interval, and about 4-10 is preferable as the number.

  Furthermore, in this embodiment, along the circumferential direction, the lower abdomen of the front body F and the buttocks of the back body B in the lower waist U, which is the area between the waist part W and the crotch L of the front body F and the back body B Lower waist elastic members 21F and 21B are provided. In the lower waist elastic member 21F of the front body F, a portion corresponding to almost the whole of the absorbent core 13 among the portions from the joint portion 30 on one side to the joint portion 30 on the other side is discontinuous, and the central portion is It is continuously provided on the left and right sides of the product except for the above. The lower back elastic member 21B of the back body F is continuously provided across the absorbent core 13 from the joint portion 30 on one side to the joint portion 30 on the other side.

  As these lower waist elastic members 21F and 21B, preferably a thin rubber thread, specifically, an elastic member having a thickness of 620 dtex or less is used. In both the front body F and the back body B, the vertical spacing is used. Is set to 7.0 mm or less, and 15 to 40 pieces are arranged and fixed between the nonwoven fabrics of the outer sheet 1 in parallel. The mutual interval between the lower waist elastic members 21F and 21B is preferably the same as or shorter than the interval between the waist elastic members 20F and 20B.

  These thread rubbers used as the lower waist elastic members 21F and 21B have smaller or substantially the same tensile stress and outer cross-sectional diameter as the thin rubber threads used as the waist elastic members 20F and 20B. be able to. As the thin rubber thread used here, specifically, one having a tensile stress in the range of 4 to 17 g, particularly in the range of 5 to 10 g at 150% elongation is preferably used.

  Further, in the first embodiment, the central part corresponding to the absorbent core 13 is discontinuous with respect to the front body F part of the crotch part L, and the crotch is continuous in the circumferential direction at the left and right side parts excluding the central part. A part expansion / contraction member 23 is provided. As for the crotch elastic members 23F and 23B, similarly to the lower waist elastic members 21F and 21B, an elastic member having a thickness of 620 dtex or less can be arranged and fixed between the nonwoven fabrics with a vertical interval of 7.0 mm or less.

  In particular, in this example, the lower waist and crotch elastic members 21F, 21B, 23F, and 23B are 2 to 3 cm (4 to 6 cm in total) before and after the crotch part 4 in the crotch L, particularly 4 to 6 cm (8 to 6 in total). 12 cm) except for the length range R.

  And in this 1st Embodiment, the waist part elastic member 21F and the surplus part elastic member in the above-mentioned front body F are given by giving the elastic member cutting and hole formation processing of the present invention to the predetermined part of outline sheet 1 The center part discontinuous part of 23F and the hole X are formed. That is, in the first embodiment, the outer sheet itself formed by sandwiching the elastic member between the nonwoven fabrics corresponds to the elastic sheet of the present invention.

  In the diaper thus formed, as shown in FIG. 13, the lower waist stretchable member 21F and the surplus stretchable member 23F in the front body F overlap with the absorbent core 13 so as to be discontinuous. The members 21F and 21F are not continuous across the absorbent core 13 in the front body F, the contraction force in the direction of tightening the waist around the absorbent core 13 is weakened, and vertical folds and the resulting decrease in absorption performance are prevented. Further, the air permeability is improved by forming a large number of holes in the outer sheet 1. On the other hand, in the back body B, the lower waist elastic member 21B is continuously disposed from the joint portion 30 on one side to the joint portion 30 on the other side, so that slippage prevention and adhesion to the skin are enhanced. . Moreover, since there is almost no wrinkle at the discontinuous portions of the lower waist elastic members 21F, 21F in the front body F, the adhesion with the pants worn from above is also improved, and the appearance is neat and clean.

  Although not shown in the drawings, the lower waist elastic members 21F and 21F of the present invention include all the portions of the absorbent core 13 in the part from the joint part 30 on one side to the joint part 30 on the other side in the front body F. It can also be formed discontinuously. In this case, the same effect as described above can be obtained.

  In the above example, the elastic member cutting and hole forming processing of the present invention is applied to the lower waist elastic region and the crotch elastic region, but the elastic member cutting and hole forming processing of the present invention is a region where other elastic properties are desired to be imparted. It can also be applied to (for example, a waist stretchable part or a leg-surrounding stretched part as in the fourth embodiment described later).

<2nd Embodiment of a pants-type disposable diaper and its manufacturing method example>
Next, a detailed description will be given of a second embodiment, which is based on attaching a separate elastic sheet to the outer sheet, together with an example of a manufacturing method thereof.
FIG. 14 shows an assembly flow of a pants-type paper diaper according to the present invention, which is composed of an absorbent main body manufacturing / supply line 100, an outer sheet manufacturing / supply manufacturing line 200, and a final processing line 300.

In the absorbent main body production supply line 100, first, the absorbent core is supplied so that the longitudinal direction thereof is along the conveying direction, and a liquid-permeable top sheet is covered and fixed thereon, and further, the liquid-permeable top sheet is formed. Standing cuffs are arranged and fixed at both ends. Subsequently, these are arranged and fixed on a liquid-impervious backsheet supplied separately, and the absorbent main body 10 is completed. In the case of this example, the liquid-impervious backsheet is processed so that both side end portions are folded in advance and a reinforcing member such as a colored urethane film is sandwiched between them to strengthen the edge. (The side edge portion may be emphasized by color hot melt bonding without using a reinforcing member, or stiffness may be strengthened).
The absorbent main body 10 thus manufactured is turned 90 degrees in a plane so that its longitudinal direction is perpendicular to the conveying direction in the 90-degree turn device 110, and the outer sheet attachment device 310 of the final processing line 300 is turned. It is conveyed to.

On the other hand, in the outer sheet manufacturing supply production line 200, the surplus part elastic member, the elastic sheet forming the lower waist elastic member, and the waist elastic member are attached to the belt-like outer sheet 201 continuous in the product width direction.
Specifically, the belt-shaped outer sheet 201 is first fed into 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 with a supply interval therebetween. As shown in FIGS. 16 and 17, the cut design sheet is also cut. 202 is arranged and fixed to the front body width direction center portion and the back body width direction center portion 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 a non-transparent material with a pattern or the like can be used. The design sheet can be designed with characters on the outside. This design part has the absorption core 13 having a certain degree of rigidity, and the outer shape sheet 201 does not deform or cause wrinkles according to the present invention, so that the design can be clearly seen without breaking. It becomes. The design sheet 202 can be interposed between the external sheets. Further, it can be printed on the outer sheet 201 or printed on the back side of the liquid-impermeable back sheet 12. Furthermore, as shown in the figure, if the front and back of the character are applied corresponding to the front and back of the product, anyone can distinguish the front and back at a glance, making changing diapers fun, and the wearer will be pleased. Become.
Subsequently, the outer sheet 201 is supplied with an elastic sheet for the front body and an elastic sheet for the rear body from the elastic member supply line 230 and attached thereto.

For this reason, in this example, in the stretchable member supply line 230, the laminate 940 formed by sandwiching one or more stretchable members 920 in an expanded state between the upper and lower sheets 910, 930 by the manufacturing method of the present invention described above. Inserted between a first roll 950 having a plurality of cutting projections 951 arranged on the surface at intervals, and a second roll 960 having a recess 961 into which the cutting projections 951 are inserted. A cutting projection 951 is inserted into a portion corresponding to the absorber in the laminated body 940, and the elastic member 920 of the portion is cut and a hole is formed in the portion. Thus, one continuous elastic sheet 206 in which the elastic member in the portion corresponding to the absorbent body is discontinuous is manufactured for the front body surplus part and lower waist part and the back body surplus part and lower waist part. . In addition, for the production of these stretchable sheets, individual lines may be provided, or one line produced may be divided into two in the longitudinal direction.
The continuous stretchable sheet 206 for the front body and the back body manufactured in this way is continuously attached to a predetermined part of the front body and the back body on the outer sheet 201 with a hot melt adhesive or the like.

Next, the outer sheet 201 to which the continuous stretchable sheet 206 for the front body and the back body is affixed is sequentially fed to the die cutter device 320, where portions corresponding to openings around the legs are cut out, On top of that, a continuous waist elastic member 203 is continuously supplied to a predetermined part of each body (for example, a plurality of materials such as thread rubber and belt-like rubber are supplied in parallel at intervals), and hot melt bonding It is fixed by. As the waist elastic member, the elastic member cutting and perforated elastic sheet of the present invention can be used.
The external sheet 201 to which the above-described member attachment is applied is subsequently sent to the external sheet attachment apparatus 310 of the final processing line 300. Here, the absorbent main body 10 that is separately fed to the portion corresponding to the center portion in the product width direction of the outer sheet 201 is disposed and fixed by hot melt bonding or the like.

  The outer sheet 201 on which the attachment of various members and the like is completed is folded in two by the folding device 330 so that the both side edges 30, 30 of the front body F and the back body B are overlapped, and then the both side edges by the heat seal device 340 After 30 and 30 are heat-sealed, the surplus portion left for conveyance in the final cutter 350 is cut off to form a portion corresponding to the waist opening edge, and the continuous product corresponds to the space between the side edges. They are cut along the points and cut to fit the product dimensions to form individual diapers. These individual diapers are sequentially fed to a counting device (not shown) after pictures and patterns are transferred onto the surface of the outer sheet 201 by the transfer roll 360 as necessary.

  As shown in FIGS. 15 to 17, the paper diaper thus manufactured has the present invention in a portion corresponding to the central portion of the absorbent core 13 in the stretchable sheets 206, 206... In both the front body F and the back body B. The elastic member cutting / hole forming process is performed, the lower waist portion and the crotch elastic members 920, 920... Are cut, and holes X, X are formed in the portions.

In this way, the lower waist and crotch elastic members 21F, 21B, 23F, and 23B in the front and rear body parts F and B can be formed discontinuously, the appearance of the front and rear body parts F and B is refreshed, and air permeability is provided. improves. In this example, as shown in FIGS. 16 and 17, since the design sheet 202 is laminated outside the stretchable sheet 206, the hole X of the stretchable sheet 206 is hidden by the design sheet 202, and the first embodiment described above. Thus, there is an advantage that the hole X is not exposed on the outer surface of the diaper and the appearance is good.
In this example, the design sheet 202 can be omitted. However, also in this case, the hole X of the stretchable sheet is covered and hidden by the outer outline sheet 201, so that the appearance is better than the example shown in FIG.
Further, the elastic members 920, 920... (21F, 21B, 23F, 23B) of the elastic sheet 206 of the present example have portions corresponding to all the width direction of the absorbent core 13 cut and formed with elastic members according to the present invention. Can also be discontinuous.

  On the other hand, in this manufacturing method example, by omitting the cutting of the elastic member of the elastic sheet for the back body, only the lower back and crotch elastic members 21B and 23B of the back body are the same as in the first embodiment. The disposable diaper can be arranged and fixed continuously from one side edge 30 to the other side edge 30.

<Third embodiment of a pants-type disposable diaper>
As shown in FIGS. 18 and 19, in the third embodiment, the lower waist elastic member 21 </ b> F and the crotch elastic member 23 </ b> F in the front body F are separated from the one side edge 30, as opposed to the first embodiment. The other side is continuously formed up to that, and the lower waist elastic member 21B and the crotch elastic member 23B corresponding to the absorbent core 13 in the back body B are discontinuous. The lower back elastic member 21B and the crotch elastic member 23B in the back body B are made discontinuous by the elastic member cutting and hole forming process of the present invention, and the holes X and X are formed in the portion to improve the air permeability. The

<Fourth embodiment of a pants-type disposable diaper>
As shown in FIG. 20, the fourth embodiment is further discontinuous with respect to the second embodiment with respect to the waist elastic members 20 </ b> F and 20 </ b> B by the elastic member cutting and hole forming processing of the present invention. In addition, a hole X is formed.

<Supplementary explanation about each form of the pants-type disposable diaper and other embodiments>
As can be inferred by comparing the above embodiments, the disposable diaper according to the present invention has at least one elastic member along the circumferential direction, and at least one central portion of the elastic member along the circumferential direction, It is sufficient if it is discontinuous by cutting and forming holes in the elastic member of the present invention, and any of the elastic members of the waist portion W, the lower waist U, and the crotch portion L is provided, and which is discontinuous. This can be selected as appropriate. However, in order to obtain a refreshing appearance, it is preferable that the elastic member of the front body F, particularly at least the lower waist and the central portions of the crotch elastic members 21F and 23F be discontinuous in the above example.
Further, the paper diaper according to the present invention is not limited to the form in which the outer sheet 1 itself is formed by the stretchable sheet of the present invention as in the first embodiment, but another invention in the outer sheet 1 as in the second embodiment. A form of attaching the elastic sheet 206 is also included.
In the above example, the rectangular absorbent main body 10 is bonded to the hourglass-shaped outer sheet 1, but in the present invention, the liquid-permeable top sheet 11 having the same shape as the outer sheet 1 is provided, and the absorbent body AB is interposed therebetween. May be provided.

In the above example, the outer sheet 1 constituting the outer surface of the product is formed by laminating and fixing two or more breathable / water-repellent nonwoven fabrics, but it may be a single nonwoven fabric. An elastic member can be joined to the use surface side. Furthermore, a plastic sheet can be interposed between the laminated nonwoven fabrics, or can be bonded to the use surface side of the backside nonwoven fabric.
In the above embodiment, all of the stretchable member at the site where the stretchability is desired to be cut is cut. For example, as shown in FIG. 21, only a part, for example, 30% or more, particularly preferably 50% or more is cut. You can also. In the illustrated example, every other elastic member 21F, 21B, 23F, 23B is cut, but it is also possible to cut only the upper part, only the middle part or only the lower part in the vertical direction. Moreover, although not shown in figure, only the air permeability improvement process by formation of the hole X can be given, without cutting an elastic member at all.

  Any one or more of the waist elastic members 20F and 20B, the lower waist elastic members 21F and 21B, and the crotch elastic members 23F and 23B may be a lattice-like elastic member. For example, as shown in FIG. 22, the elastic sheet of the present invention is stretched with respect to the portion corresponding to the absorbent core 13 at the center in the circumferential direction using a net-like, for example, lattice-shaped thread rubber fixed between the nonwoven fabrics of the outer sheet 1. Member cutting and hole forming processing are performed. In this case, the rubber thread in the circumferential direction forms the elastic members of the waist W, the lower waist U, and the crotch L.

As an elastic member provided in each part of the paper diaper, in addition to materials such as natural rubber and synthetic rubber, elastic elastic materials such as urethane can be used. A thin elastic band or a sheet having a large area can also be used. Examples of these include a band such as urethane, a film or a sheet. A non-porous film or a perforated film can be selected as the film, and a mesh-like sheet can be selected as the sheet. An arrangement example of the non-porous film 60 is shown in FIG. Moreover, the example of arrangement | positioning of the mesh-like film 61 was shown in FIG. Also in these forms, it is important to perform the cutting process of the elastic member and the formation of the hole X according to the present invention on the central portion where it is desired to kill the elasticity.
Moreover, in order to fit the crotch part or the crotch part, the outer sheet | seat 1 can be provided with an expansion-contraction member with a various form.

  25, the crotch elastic members 24 and 24 are fixed between the nonwoven fabrics of the outer sheet 1 from the end of the front side to the end of the back side almost in parallel with the leg opening edge of the crotch L. Is. It is desirable that the protruding width t of the leg opening edge from the crotch elastic members 24, 24 is within 5 mm (preferably within 2 mm). In this embodiment, the crotch elastic member 24 contracts the leg opening LO to prevent the leakage of body fluid. In order to clearly indicate the crotch elastic members 24, 24, the absorbent main body 10 is indicated by a virtual line.

FIG. 26 shows that in the front body F and the back body B, the crotch elastic members 25F and 25B are respectively stretched from the left side part to the right side part so as to cross the crotch part. The outer sheet 1 is fixed between the nonwoven fabrics. Further, in this example, the leg circumference / groin stretchable members 25F and 25B on the front body F side and the back body B side partially intersect each other within a range R of 2 to 3 cm before and after the crotch 4, particularly 4 to 6 cm. As a form.
Also in this embodiment, when the protruding width t of the leg opening edge from the leg surrounding portions of the elastic members 25F and 25B is set to 5 mm or less (preferably 2 mm or less), similarly to the tenth embodiment, the fluttering of the leg opening edge is further performed. The feeling is further reduced.

FIG. 27 shows the crotch and crotch elastic members 26F, extending from the end of the left side to the end of the right side so as to cross the crotch in the front body F and the back body B, respectively. 26B is fixed between the nonwoven fabrics of the outer sheet 1. In this example, the crotch part elastic members 26F and 26B pass through a range R of 2 to 3 cm, particularly 4 to 6 cm, respectively, before and after the crotch part 4, but are parallel to each other at the crotch part without intersecting.
In the above-described examples shown in FIGS. 25 to 27, only the center portion of the lower waist elastic members 21F and 21B is subjected to the cutting of the elastic members and the formation of the holes X according to the present invention, and the waist elastic members 20F and 20B, etc. The stretchable member portion of the present invention is not subjected to cutting of the stretchable member and formation of the hole X of the present invention.

  On the other hand, as shown in FIG. 28, the width of the outer sheet 1 can be narrower than the width of the absorbent main body 10, particularly the absorbent core 13, in the crotch portion. In the form of FIG. 18 and the above-described form, the outer shape sheet 1 that protrudes outward from the side edge of the absorbent core 13 tends to flicker, which is a problem when trying to obtain a clean feeling for the entire product. Therefore, similarly to the crotch elastic members 23F and 23B of the first embodiment, the shaping elastic members 27 are provided between the nonwoven fabrics of the outer sheet 1 on both sides of the crotch L, and the protruding outer sheet 1 is moved toward the center. Thus, the flickering feeling can be eliminated. In this case, the outer end portion of the shaping elastic member 27 group is fixed by the seal line 28 made of hot melt adhesive, thereby preventing the outer end portion of the shaping elastic member 27 group from being pulled into the center side.

Similarly, in order to eliminate the feeling of fluttering in FIG. 29, in the front body F and the back body B, from the end of the left side to the end of the right side so as to cross the crotch, The shaping elastic members 29 and 29 are respectively fixed between the nonwoven fabrics of the outer sheet 1. In this form, the intermediate circumferential direction portion of the shaping elastic member 29 moves the outer sheet 1 that protrudes outward from the side edge of the absorbent core 13 to the center side, so that the flickering feeling can be eliminated, Since the end portion of the shaping elastic member 29 extends to the end portion of the side portion, it acts to lift the crotch portion toward the waist portion T side, and the slackness of the abdomen and buttocks is eliminated, resulting in a cleaner feeling.
In addition, the aspect of the process of cutting the elastic member and forming the hole X in the examples of FIGS. 28 and 29 is the same as that of the fourth embodiment.

<First embodiment of tape-type paper diaper>
As described above, the present invention covers not only pants-type disposable diapers but also tape-type paper diapers. This first embodiment is shown in FIGS. 30 and 31. FIG. In this example, upright sheets 41, 41 are provided on both sides, and elastic members 51, 51 are provided at the distal end portions of these free upright portions to constitute upright cuffs C, C. The standing sheet 41 is joined to the back sheet 1 similar to the outer sheet. Reference numeral 42 denotes a tape fastener for bringing the left and right sides on the back side into the left and right sides on the abdomen and joining them. In this example, between the nonwoven fabrics of the outer sheet (back sheet) 1 in the waist W at the longitudinal ends of the front body F and the back body B, in order to improve the fit around the waist, the waist opening WO Waist elastic members 20F and 20B made of thin rubber thread are arranged and fixed under extension so as to expand and contract with an interval parallel to the edge. In addition, waist lower elastic members 21F and 21B are provided along the circumferential direction on the lower abdomen of the front body F and the buttocks of the rear body B along the circumferential direction except for the central part. Crotch elastic members 23F and 23B extending between the parts are provided.
Even in such a case, except for the waist elastic members 20F and 20B, the center portions of the lower waist elastic members 21F and 21B and the crotch elastic members 23F and 23B are cut and discontinuous by the cutting and hole forming process of the elastic members of the present invention. In addition, holes X and X are formed in the portion, and air permeability is improved.

<Second embodiment of tape-type paper diaper>
A second embodiment is shown in FIGS. 32 and 33. FIG. This form is an example which does not have a standing cuff. And the elastic members 52 and 52 are being fixed between the liquid-permeable top sheet 11 and the back seat | sheet 12 along the vertical direction at the flap part of the outer side of the absorption core 13. As shown in FIG. Also in this example, waist elastic members 20F and 20B, lower waist elastic members 21F and 21B, and crotch elastic members 23F and 23B are provided.
Even in such a case, except for the waist elastic members 20F and 20B, the center portions of the lower waist elastic members 21F and 21B and the crotch elastic members 23F and 23B are cut and discontinuous by the cutting and hole forming process of the elastic members of the present invention. In addition, holes X and X are formed in the portion, and air permeability is improved.

<About width of each part of suitable product>
In the paper diaper of the present invention, as shown in FIG. 34, the width d2 of the absorbent core 13 is preferably 40% or less with respect to the waist width d1.
Furthermore, in the paper diaper to which the stretchable sheet obtained by cutting the stretchable member of the present invention is applied, it is desirable that the side end of the outer sheet 1 is located within 5 mm from the side end of the absorbent core 13 in the crotch portion 4. . As shown in FIG. 34 (A), the crotch 4 side end of the outer sheet 1 protrudes outside the crotch side end of the absorbent core 13 and the protruding width d3 is 5 mm or less. 34B, the crotch 4 side end of the outer sheet 1 enters the crotch side end of the absorbent core 13, and the crotch side end of the absorbent core 13 is the crotch part 4 of the outer sheet 1. As shown in FIG. The case where the protrusion width d4 protrudes from the side end and the protrusion width d4 is 5 mm or less is included. Moreover, although not illustrated, the case where the crotch part 4 side end of the external shape sheet 1 and the crotch part side end of the absorption core 13 overlap is also included.

  A disposable diaper comprising an elastic sheet produced by cutting at least an elastic member in such a manner that, in at least one of the front body and the back body, the expansion / contraction direction is along the circumferential direction and the cutting part is located at the center. In the case, the contraction of the central portion is eliminated, so that the volume feeling and the mummy feeling are reduced, and the appearance is refreshed. Further, as described above, the crotch portion 4 side end of the outer sheet 1 is formed on the absorbent core 13. By forming it so that it is located within 5 mm from the end of the crotch part, the outer sheet 1 hardly protrudes from the side part of the absorbent core 13, and the voluminous feel and muffled feeling of the crotch part 4 are further reduced, and the appearance is further improved. It becomes that.

It is a perspective view which shows the Example of this invention. It is a perspective view which shows the other Example of this invention. It is explanatory drawing of the operation | movement aspect of a 1st and 2nd roll. It is explanatory drawing of the expansion-contraction member cutting | disconnection and hole formation process of this invention. Cutting convex part It is sheet | seat sectional drawing which shows the aspect of the hole formed by this invention. It is a perspective view which shows various cutting convex parts. It is a top view which shows the example of an arrangement | sequence of a cutting convex part. It is a top view which shows a cutting | disconnection aspect. It is explanatory drawing which shows the various laminated structure of an elastic sheet. It is a top view from the expansion | deployment state use surface side of 1st Embodiment for the vocabulary description of this invention. It is a top view from the deployment state use surface side of a 1st embodiment. It is a 5-5 line arrow directional view of FIG. It is the front and back view of a paper diaper of a product state. It is a manufacture flow of the underpants type disposable paper diaper of 2nd Embodiment. It is a top view from the deployment state use surface side of a 2nd embodiment. It is a 5-5 line arrow directional view of FIG. It is the front and back view of a paper diaper of a product state. It is a top view from the deployment state use surface side of a 3rd embodiment. It is the front and back view of 3rd Embodiment. It is a top view from the deployment state use surface side of a 4th embodiment. It is a top view from the deployment state use surface side of other embodiments. It is a top view from the deployment state use surface side of another embodiment. It is a top view from the expansion | deployment state use surface side of embodiment provided with the expansion-contraction member of another raw material. It is a top view from the expansion | deployment state use surface side of embodiment provided with the expansion-contraction member of another raw material. It is a top view from the expansion | deployment state use surface side of embodiment which added the other expansion-contraction member. It is a top view from the expansion | deployment state use surface side of embodiment which added another elastic member. Furthermore, it is a top view from the expansion | deployment state use surface side of embodiment which added the other expansion-contraction member. It is a top view from the expansion | deployment state use surface side of embodiment which added another expansion-contraction member. It is a top view from the expansion | deployment state use surface side of embodiment which added the other expansion-contraction member. It is a top view from the expansion | deployment state use surface side of 1st Embodiment of a tape-type paper diaper. It is the 5-5 line equivalent position arrow directional view. It is a top view from the expansion | deployment state use surface side of 2nd Embodiment of a tape-type paper diaper. It is the 5-5 line equivalent position arrow directional view. It is a use state front view of the paper diaper which shows the suitable example of a crotch width.

  910 ... Lower sheet, 911 ... Adhesive application part, 912 ... Adhesive non-application part, 920 ... Elastic member, 921 ... Guide guide, 930 ... Upper sheet, 931, 932 ... Press roll, 950 ... First roll, 951 ... cutting convex part, 960 ... 2nd roll, 961 ... concave part.

Claims (3)

On the sheet or between the upper and lower sheets, a plurality of thread-like elastic members are arranged in a stretched state in parallel and spaced apart to form a laminate,
Between the first roll formed with a large number of cutting protrusions on the surface at intervals in the roll axial direction and the circumferential direction, and the second roll facing the first roll,
Passing through the laminate and, at that time, cutting the projecting protrusions into the laminate, cutting at least a part in the longitudinal direction of at least some of the plurality of elastic members, and holes in the sheet A method for producing a stretchable sheet, characterized by performing a forming process. An outer sheet,
A paper diaper that is fixed to the inner surface of the outer sheet and has an absorbent main body that extends in the front-rear direction around the crotch,
On the sheet or between the upper and lower sheets, a plurality of thread-like elastic members are arranged in a stretched state in parallel and spaced apart to form a laminate,
Between the first roll formed with a large number of cutting protrusions on the surface at intervals in the roll axial direction and the circumferential direction, and the second roll facing the first roll,
Passing through the laminate and, at that time, cutting the projecting protrusions into the laminate, cutting at least a part in the longitudinal direction of at least some of the plurality of elastic members, and holes in the sheet While performing a forming process to obtain an elastic sheet,
A paper diaper characterized in that a cutting and hole forming region of the elastic member of the elastic sheet corresponds to a partial region substantially corresponding to the entire width direction of the absorbent core having a certain degree of rigidity of the paper diaper. The paper diaper consists of a waist part, a lower waist part, a crotch part in order along the front-rear direction,
In the lower waist, cutting of the elastic member and hole forming processing are performed,
The disposable diaper according to claim 2, wherein the waist portion is not subjected to cutting of the elastic member and hole forming processing.

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