JP5060896B2 - Stretchable sheet manufacturing method and disposable diaper or disposable diaper cover - Google Patents

Description

  The present invention relates to a technique for using a net-like elastic member in a disposable diaper or the like.

Absorbent articles such as disposable diapers are formed by laminating sheets such as non-woven fabrics and films, so as to fit the three-dimensional shape of the body and deform following the movement of the body, Elastic members such as rubber thread are fixed in an extended state along the ridges, ridge grooves, and the like (see, for example, Patent Documents 1 and 2).
However, in order to provide an elastic expansion / contraction part along the diagonal direction as in the case where the rubber thread is arranged along the ridge or the ridge groove, an advanced and expensive facility is necessary in addition to swinging and mounting the elastic member. There was a problem that.
JP 2006-271450 A JP 2003-190212 A

  Then, the main subject of this invention is providing the technique which can form the elastic expansion-contraction part along a diagonal direction, without using rocking | fluctuation of an elastic member.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
In the method for producing a stretchable sheet having an oblique stretchable part extending along a direction in which the side edge intersects the MD direction and the CD direction,
After fixing the net-like elastic member formed in a sheet shape to the base sheet in a state of being stretched in the MD direction and the CD direction,
Of the net-like elastic member, cut at least a portion along the side edge of the diagonally stretchable part so that the contraction force is weakened or eliminated, and without cutting the part located at the diagonally stretchable part Leaving a continuous portion along the side edge of the diagonally stretchable portion ;
The manufacturing method of the elastic sheet characterized by the above-mentioned.

(Function and effect)
It is known to use a net-like elastic member in the production of an elastic sheet. The present invention does not simply use this net-like elastic member, but is fixed to the base sheet in a state of being stretched in the MD direction and the CD direction, and then at least on the side edge of the diagonally stretchable portion of the net-like elastic member. The portion along the section is cut so that the contraction force is weakened or eliminated, and the portion located in the oblique expansion / contraction section is not cut. In the cut portion of the net-like elastic member, the elastic elastic action is weakened or eliminated due to the discontinuity of the net-like elastic member, and the net-like elastic member of the oblique elastic portion whose side edge is defined by this cut portion is Stretching is exhibited along the extending direction of the side edge substantially independently of the surroundings. Therefore, it is possible to form the elastic expansion / contraction portion along the oblique direction without using the swing of the elastic member. The term “side edge” used in relation to the cut portion of the net-like elastic member means a side edge when the expansion / contraction direction of the oblique expansion / contraction portion is used as a reference (hereinafter the same).

<Invention of Claim 2>
After fixing the net-like elastic member to the base sheet, the net-like elastic member is continuously or intermittently along the MD direction at a predetermined interval in the CD direction at a portion different from the obliquely stretchable portion. The method for producing an elastic sheet according to claim 1, which is cut into pieces.

(Function and effect)
Thus, in a part different from the diagonally stretchable portion, the net elastic member is continuously or intermittently cut along the MD direction with a predetermined interval in the CD direction, thereby providing stretchability along the MD direction. The part which exhibits can be provided. Therefore, for example, when the width direction of the diaper is the MD direction of the production line, such as a pants-type disposable diaper, the elastic elastic expansion and contraction is performed along the waist using a net-like elastic member common to the oblique expansion and contraction part. An elastic stretchable part can be formed.

<Invention of Claim 3>
After fixing the net-like elastic member to the base sheet, the net-like elastic member is continuously or intermittently along the CD direction at a predetermined interval in the MD direction at a portion different from the obliquely stretchable portion. The manufacturing method of the elastic sheet of Claim 1 cut | disconnected to.

(Function and effect)
Thus, in a part different from the diagonally stretchable part, the net-like elastic member is continuously or intermittently cut along the CD direction at a predetermined interval in the MD direction, thereby being stretchable along the CD direction. The part which exhibits can be provided. Therefore, for example, when the longitudinal direction of the diaper is the MD direction of the production line, such as a tape-type disposable diaper, the elastic elastic expansion and contraction is performed along the circumference of the waist using a net-like elastic member common to the oblique expansion and contraction portion. An elastic stretchable part can be formed.

<Invention of Claim 4>
In a disposable diaper or a disposable diaper cover having a portion covering from the ventral side to the back side through the crotch part,
A net-like elastic member formed in a sheet shape includes a slanted elastic part extending along at least one of the ridge and the ridge groove, and the sheet-like elastic member extends in the front-rear direction and the width direction over a wider range than the slanted elastic part. Fixed in state,
Of the net-like elastic member, at least a portion along the side edge of the diagonally stretchable portion is cut so that the contraction force is weakened or eliminated, and a portion located in the diagonally stretchable portion is not cut and the mesh is not cut . A continuous part is left along the side edge of the diagonally stretchable part,

(Function and effect)
The same effects as those of the first aspect of the invention can be achieved. That is, in the cut portion of the net-like elastic member, the elastic elastic action is weakened or eliminated due to the discontinuity of the net-like elastic member, and the net-like elastic member of the oblique elastic portion whose side edges are defined by this cut portion. Exhibits elasticity along the extending direction of its side edges substantially independently of the surroundings. In addition, this non-cut portion exhibits elasticity along the ridges and ridges when viewed macroscopically, but when viewed microscopically, each line constituting the net (network) extends along its own direction. In order to exhibit elasticity, even a portion that exhibits complex movement such as a ridge or a ridge groove is more excellent in fit and follow-up.

<Invention of Claim 5>
A net-like elastic member formed in a sheet shape including a portion corresponding to the waistline and in a wider range than this portion is fixed in a state of extending in the front-rear direction and the width direction. The disposable diaper or the disposable diaper cover according to claim 4, wherein the disposable diaper or the disposable diaper cover is cut continuously or intermittently along the width direction with an interval in the front-rear direction except for a portion located in the obliquely stretchable portion.

(Function and effect)
In the present invention, a net-like elastic member can be used to improve not only the ridges and ridge grooves but also the fit around the waist. In this case, stretchability is exhibited along the waistline direction by the uncut portion of the net-like elastic member. In addition, the net-like elastic member provided in the range including the part corresponding to the waistline may be integrated with another part provided in other parts such as a bag, or may be separate.

<Invention of Claim 6>
In the part corresponding to the crack, the net-like elastic member including the crack-corresponding part that goes upward as it goes from the both sides in the width direction toward the center in the width direction, and in a wider area than this part, In the net-like elastic member, at least a portion along the side edge of the crack-corresponding portion of the net-like elastic member is weakened except for a portion located in the diagonally stretchable portion. Or a portion of the mesh that is cut so that it disappears and that is located in the portion corresponding to the crack is not cut, and a continuous portion of the mesh is left along the side edge of the portion corresponding to the crack. The disposable diaper or disposable diaper cover as described.

(Function and effect)
A fissure is a recess located in the intercostal space, which is difficult to fit a diaper or the like. The invention described in this section intends to use a net-like elastic member in order to improve the fit to the crack. In the cut portion of the net-like elastic member, the elastic elastic action is weakened or eliminated due to the discontinuity of the net-like elastic member, and the crack-corresponding net-like elastic member whose side edge is defined by this cut portion is By contracting along the extending direction of the side edges, substantially independently of the surroundings, the crack enters and fits. In addition, this non-cut portion exhibits elasticity along the crack when viewed macroscopically, but each line constituting the net (network) stretches along its own direction when viewed microscopically. Because of this, it exhibits excellent fit even for deep depressions formed between curved surfaces, such as cracks. The net-like elastic member provided in the range including the part corresponding to the crack may be integrated with another part provided in another part such as a heel or may be separate.

  As described above, according to the present invention, there are advantages such as being able to form an elastic stretchable part along an oblique direction without using the swinging of the elastic member.

Hereinafter, an embodiment of the present invention will be described first with respect to a common configuration, and then features of various embodiments will be described.
FIG. 1 is a front external view of the pants-type disposable diaper 1 according to the embodiment in a product state, and FIG. 2 is a plan view of the inner surface side in a developed state. This pants-type disposable diaper 1 (hereinafter also simply referred to as an article) is made of a cotton-like pulp or the like between a liquid-permeable surface sheet 11 made of a nonwoven fabric or the like and a liquid-impermeable back sheet 12 made of polyethylene or the like. The absorbent body 10 includes an absorbent body 13 and an exterior sheet 20 provided integrally with the outer surface of the absorbent body 10. When manufacturing, after the back surface of the absorbent main body 10 is integrated with the hot melt adhesive G or the like on the upper surface side (inner surface side) of the outer sheet 20, the absorbent main body 10 and the outer sheet 20 are folded in the front-rear direction. The pants-type disposable diaper in which a waist opening and a pair of left and right leg openings are formed is formed by overlapping and joining both sides thereof by heat welding or hot melt adhesive.

Hereinafter, the absorbent main body 10 and the exterior sheet 20 will be described in this order.
(Basic structure of absorbent body)
As shown in FIGS. 2 to 4, the absorbent main body 10 absorbs cotton-like pulp between a liquid-permeable surface sheet 11 made of a nonwoven fabric or the like and a liquid-impermeable back sheet 12 made of polyethylene or the like. The body 13 is interposed and absorbs and retains body fluids.

  As the liquid-permeable surface sheet 11 that covers the surface side (skin contact surface side) of the absorbent body 13, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. The material fibers that make up the nonwoven fabric can be synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft. When a large number of through holes are formed in the liquid-permeable surface sheet 11, urine and the like are quickly absorbed, and the dry touch property is excellent. The liquid-permeable surface sheet 11 is wound around the side edge of the absorbent body 13 and extends to the back surface side of the absorbent body 13.

  As the liquid-impervious back sheet 12 that covers the back side (non-skin contact surface side) of the absorbent body 13, a liquid-impervious plastic sheet such as polyethylene or polypropylene is used. Those having the following are preferably used. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. If the sheet thickness is the same, the rigidity is lower than that of the non-porous sheet, which is superior in terms of flexibility.

  The absorber 13 is preferably formed by molding a fluffy pulp and a water-absorbing polymer. The water-absorbing polymer can be mixed in the pulp constituting the absorber, for example, as a granular powder. Pulp includes cellulose fibers such as chemical pulp and dissolved pulp obtained from wood, and artificial cellulose fibers such as rayon and acetate. It can use suitably in terms of. Of course, other known absorbers can also be used. Moreover, the absorber 13 is packaged by a liquid-permeable packaging sheet 14 such as crepe paper as necessary for retaining the shape and polymer. The shape of the absorber 13 can be a shape in which the width of the crotch portion is narrower than the back side and the abdominal side as shown in the drawing, or a rectangular shape.

  On the other hand, it is preferable that a solid gather BS that fits around the legs is formed on both sides of the absorbent main body 10. This three-dimensional gathered BS is formed by the gathered nonwoven fabric 15. As the gathered nonwoven fabric, as shown in FIG. 4 and FIG. The side edge portion of the wound absorbent body 13 is further wound from the upper side thereof and extends to the back surface side of the absorbent body 13 to be bonded. More specifically, the gathered nonwoven fabric 15 has a three-dimensional gather BS forming portion at the intermediate portion in the longitudinal direction of the absorbent article 1 and a range from the intermediate portion in the width direction to the back side of the absorbent body 13 is a hot melt adhesive or the like. In the longitudinal front and rear end portions, the section from the intermediate portion in the width direction to the one side end edge is bonded in the range extending to the back side of the absorber 13, and the portion forming the three-dimensional gather BS is absorbed by the absorber. While being folded at the upper surface portion of 13, it is bonded by a hot melt adhesive or the like.

  Inside the gathered nonwoven fabric 15 formed of a double sheet nonwoven fabric, a plurality of thread-like elastic elastic members 16, 16... The thread-like elastic elastic members 16, 16... Are for forming a three-dimensional gather BS by raising the nonwoven fabric portion protruding from the absorber side edge by elastic elastic force as shown by a two-dot chain line in FIG. 4 in the product state. It is.

  The liquid-impermeable back sheet 12 enters the inside of the double sheet-like gather nonwoven fabric 15 and constitutes a leak-proof wall on the lower end side of the three-dimensional gather BS as shown in FIG. As the liquid-impermeable back sheet 12, it is desirable to use an opaque sheet so that brown color such as defecation and urine does not appear. As the opacification, a plastic film and a pigment and filler such as calcium carbonate, titanium oxide, zinc oxide, white carbon, clay, talc and barium sulfate are preferably used.

  As the thread-like elastic elastic member 16, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, and the like that are usually used can be used. In order to make it difficult to see from the outside, it is preferable that the thickness is 925 dtex or less, the tension is 150 to 350%, and the interval is 7.0 mm or less. Instead of the thread-like elastic elastic member, a tape-like elastic elastic member having a certain width may be used.

  In the same manner as the liquid-permeable surface sheet 11, the material fiber constituting the gathered nonwoven fabric 15 is made of synthetic fibers such as polyethylene or polypropylene, such as olefin, polyester, and amide, as well as recycled fibers such as rayon and cupra, and cotton. Non-woven fabric obtained by an appropriate processing method such as a spunbond method, a thermal bond method, a melt blown method, a needle punch method, etc. can be used. It is preferable to use a nonwoven fabric that suppresses the basis weight and has excellent air permeability. Furthermore, for the gathered nonwoven fabric 15, in order to prevent the transmission of urine and the like, to prevent fogging, and to enhance the touch to the skin (dry feeling), silicon-based, paraffin metal-based, alkylchromic croid-based water repellent, etc. It is desirable to use a water-repellent non-woven fabric coated with.

(Structure of exterior sheet)
As shown in FIGS. 4 and 5, the exterior sheet 20 is a two-layer nonwoven fabric sheet composed of an upper layer nonwoven fabric 20A and a lower layer nonwoven fabric 20B, and a net-like elastic member 30 between the upper layer nonwoven fabric 20A and the lower layer nonwoven fabric 20B. Is fixed in a stretched state, and is given elasticity. The planar shape is a pseudo hourglass shape as a whole by a concave leg circumference cut line 29 formed to form leg openings on both sides of the middle, from the abdominal side to the back side through the crotch part. It has a covering part. The fixing portion by the adhesive is indicated by a cross marked with a symbol G. An unmarked X mark portion is also a fixed portion by an adhesive. The net-like elastic member 30 is preferably sandwiched and fixed between a plurality of sheets, but can also be fixed to one side of one sheet.

(First form)
Characteristically, as shown in FIGS. 4 to 6, the net-like elastic member 30 formed in a sheet shape is fixed in a state of extending in the front-rear direction and the width direction over the entire exterior sheet 20, Of the net-like elastic member 30, the portions 31 and 32 located in the diagonally extending and contracting portions extending along the ridges and the ridge grooves are not cut, but in other portions excluding the portions 31 and 32, It is cut | disconnected continuously along the width direction at intervals.

  The net-like elastic member 30 is not particularly limited as long as it is net-shaped, and may be a honeycomb-like shape. However, from the viewpoint of cost and ease of cutting, a lattice-like shape as illustrated is preferable. In the case of the lattice-like net-like elastic member 30, it is preferable to provide the vertical and horizontal thread-like portions so as to correspond to the front-rear direction and the width direction of the diaper, but other arrangements may be employed. In the case of the lattice-like net-like elastic member 30, the distance between the vertical lines and the horizontal lines is preferably about 2 to 16 mm, and the thickness of the vertical lines and the horizontal lines is preferably about 200 to 2000 dtex.

  The net-like elastic member 30 can be provided only on a part of the exterior sheet 20 as long as it is provided in a wider range than the stretchability imparting portion, in addition to being provided on the entire exterior sheet 20 as illustrated. In this case, when there are a plurality of stretchability imparting portions, they can be provided so as to extend over a plurality of parts in addition to being provided independently.

  If the direction of one or both side edges intersects the front-rear direction and the width direction (that is, along the diagonal direction), the slanted stretchable part may be curved. Although it may be linear, it is preferably in the shape of an inverted letter H as shown.

  In the exterior sheet 20 thus configured, the net-like elastic member 30 is cut at portions other than the portions 31 and 32 located at the diagonally stretchable portion, and the contraction force is relatively weak. The stretchability is exhibited along an oblique direction (indicated by an arrow) in which the side edge extends substantially independently of the surroundings. In addition, the non-cut portions 31 and 32 exhibit elasticity along the ridges and ridges when viewed macroscopically, but when viewed microscopically, the lines constituting the net (net) are in their own directions. In order to exhibit stretchability along the surface, even a portion that exhibits a complex movement such as a ridge or a ridge groove becomes more excellent in fit and follow-up.

  Moreover, in the part except the parts 31 and 32 located in the diagonal expansion-contraction part, each line 30a along the vertical direction is cut | disconnected at predetermined intervals in the front-back direction, and each line 30b along a horizontal direction is cut | disconnected in the width direction. Therefore, the continuous portion 30b along the lateral direction exhibits stretchability along the waistline direction. In the portion excluding the portions 31 and 32 located in the obliquely stretchable portion of the illustrated form, the cut portions are continuously provided along the width direction, but the vertical lines are left without being cut every several. Even when cut intermittently, the contraction force in the vertical direction is weakened and the contraction force of the horizontal line is increased, so that the stretchability in the waistline direction is exerted strongly.

  In addition, this 1st form is for implement | achieving the elasticity similar to the diaper 100 using the thread rubber 300 shown to Fig.11 (a) using the net-like elastic member 30. FIG.

  On the other hand, as shown in FIG. 7, it is also possible to cut all of the lines 30a and 30b constituting the net in a portion excluding the portion 33 located in the obliquely stretchable portion so that the contraction force is substantially eliminated.

(Second form)
FIG. 8 shows a second embodiment. Of the net-like elastic member 30, not only the portions 31 and 32 located in the diagonally stretchable portions along the ridges and ridge grooves but also the portion 34 located in the crack-corresponding portion. It is different from the first embodiment in that it is not cut. The crack-corresponding portion is a C-shaped portion that extends upward as it goes from the both sides in the width direction toward the center in the width direction at the portion corresponding to the crack (back side center in the width direction). The portions 31 and 32 located in the obliquely stretchable portion in the second form have basically the same configuration, although the shape is somewhat different from the first form.

  In the thus configured exterior sheet 20, the portion 34 of the net-like elastic member 30 that is located in the crack-corresponding portion is substantially independent of the periphery, and the side edges (upper and lower edges in the figure) extend. By contracting along the existing oblique direction, it enters into the crack and comes to fit. Others are the same as that of the diagonal expansion-contraction parts 31 and 32 in a bag etc. In addition, this 2nd form is for implement | achieving the elasticity similar to the diaper 100 using the rubber thread 300 shown in FIG.11 (b) using the net-like elastic member 30. FIG.

(Third form)
Although the first and second embodiments are application examples to a so-called brief type, it is needless to say that the first and second embodiments can be applied to a so-called boxer type as shown in FIGS. In the example shown in FIG. 9, the absorbent main body 10 extends from the abdominal side to the back side, and the same elasticity as the diaper 100 using the rubber thread 300 shown in FIG. This is to be realized using 30. In the example shown in FIG. 10, the absorbent main body 10 extends only from the abdominal side to the crotch and does not extend to the back side. The diaper 100 using the rubber thread 300 shown in FIG. The same stretchability as that described above is realized by using the net-like elastic member 30. Others are the same as each said form.

(Other)
The above example is an application example to a pants-type disposable diaper, but can also be applied to a tape-type disposable diaper, a urine absorption pad, a sanitary napkin, and the like. Moreover, what abbreviate | omitted the absorptive main body 10 of the said example can be used as a disposable diaper cover as it is. That is, the difference between the diaper and the diaper cover is whether or not the absorbent body 13 is provided.

(About manufacturing method)
In the present invention, a method for manufacturing the exterior sheet 20 or the like having the stretchable portion by the net-like elastic member 30 is also proposed. That is, first, the upper layer nonwoven fabric 20A and the lower layer nonwoven fabric 20B as the base material sheet are bonded together, and the net-like elastic member 30 formed in a sheet shape is sandwiched between the two in a state of being stretched in the MD direction and the CD direction. Fix with adhesive. After that, by embossing or cutting them integrally in a predetermined pattern, the net-like elastic member 30 has diagonally stretchable parts (parts along the ridges, ridges, and cracks in the above example). Without cutting the portions 31 to 33 located at (3), the portions along both side edges of the obliquely stretchable portion, preferably all the portions other than the obliquely stretchable portion are cut so that the contraction force is weakened or eliminated. Thus, it is possible to form the elastic expansion / contraction portion along the oblique direction without using the swing of the elastic member.

  In particular, the elastic elastic part 30 along the trunk can be formed at a part different from the oblique elastic part using the net elastic member 30 common to the oblique elastic part. Specifically, when the width direction of the diaper is the MD direction of the production line, such as a manufacturing facility for a pants-type disposable diaper, after the net elastic member 30 is fixed to the base material sheets 20A and 20B The net-like elastic member 30 is cut continuously or intermittently along the MD direction at a predetermined interval in the CD direction in a part or all of the parts other than the diagonally stretchable part. In this case, a stretchable part along the MD direction is formed. On the other hand, when the longitudinal direction of the diaper is the MD direction of the production line as in a tape-type disposable diaper manufacturing facility, the direction is opposite. That is, after the net-like elastic member 30 is fixed to the base material sheets 20A and 20B, a part or all of the portions other than the diagonally stretchable parts are spaced apart in the MD direction by moving the net-like elastic member 30 along the CD direction. When cut continuously or intermittently, a stretchable part along the CD direction can be formed.

  Needless to say, the formation position of the obliquely stretchable portion by this manufacturing method is not limited to the ridges, ridges, and cracks, but can be applied to other parts. Needless to say, the forming position of the stretchable part along the MD direction or the CD direction by this manufacturing method is not limited to the waistline but can be applied to other parts.

  The present invention can be applied to the formation of stretchable parts in disposable diapers and the like.

It is a front view of the product state of a pants-type disposable diaper. It is an inner side top view in the deployment state of a pants type disposable diaper. It is a top view of an absorptive main part. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a top view of the unfolding state of the exterior sheet and net-like elastic member which show the 1st form. It is a principal part enlarged plan view of a modification. It is a top view of the unfolding state of the exterior sheet and net-like elastic member which show the 2nd form. It is a top view of the expansion | deployment state of the exterior sheet | seat and net-like elastic member which show a 3rd form. It is a top view of the expansion | deployment state of the exterior sheet | seat and net-like elastic member which show a 3rd form. It is a top view which shows the various forms using the conventional rubber thread.

  DESCRIPTION OF SYMBOLS 1 ... Absorbent article, 10 ... Absorbent main body, 10n ... Non-fixed part, 11 ... Liquid-permeable surface sheet, 12 ... Liquid-impermeable back sheet, 13 ... Absorber, 14 ... Crepe paper, 15 ... Gather nonwoven fabric, DESCRIPTION OF SYMBOLS 16 ... Thread-like elastic expansion-contraction member, 17 ... Penetration part, 20 ... Exterior sheet, 21 * 22 ... Side joint edge, 29 ... Leg circumference cut line, 30 ... Net-like elastic member, F ... Abdominal part, B ... Dorsal side portion.

Claims (6)

In the method for producing a stretchable sheet having an oblique stretchable part extending along a direction in which the side edge intersects the MD direction and the CD direction,
After fixing the net-like elastic member formed in a sheet shape to the base sheet in a state of being stretched in the MD direction and the CD direction,
Of the net-like elastic member, cut at least a portion along the side edge of the diagonally stretchable part so that the contraction force is weakened or eliminated, and without cutting the part located at the diagonally stretchable part Leaving a continuous portion along the side edge of the diagonally stretchable portion ;
The manufacturing method of the elastic sheet characterized by the above-mentioned.   After fixing the net-like elastic member to the base sheet, the net-like elastic member is continuously or intermittently along the MD direction at a predetermined interval in the CD direction at a portion different from the obliquely stretchable portion. The method for producing an elastic sheet according to claim 1, which is cut into pieces.   After fixing the net-like elastic member to the base sheet, the net-like elastic member is continuously or intermittently along the CD direction at a predetermined interval in the MD direction at a portion different from the obliquely stretchable portion. The method for producing an elastic sheet according to claim 1, which is cut into pieces. In a disposable diaper or a disposable diaper cover having a portion covering from the ventral side to the back side through the crotch part,
A net-like elastic member formed in a sheet shape includes a slanted elastic part extending along at least one of the ridge and the ridge groove, and the sheet-like elastic member extends in the front-rear direction and the width direction over a wider range than the slanted elastic part. Fixed in state,
Of the net-like elastic member, at least a portion along the side edge of the diagonally stretchable portion is cut so that the contraction force is weakened or eliminated, and a portion located in the diagonally stretchable portion is not cut and the mesh is not cut . A continuous part is left along the side edge of the diagonally stretchable part,
A disposable diaper or a disposable diaper cover characterized by that.   A net-like elastic member formed in a sheet shape including a portion corresponding to the waistline and in a wider range than this portion is fixed in a state of extending in the front-rear direction and the width direction. The disposable diaper or the disposable diaper cover according to claim 4, wherein the disposable diaper or the disposable diaper cover is cut continuously or intermittently along the width direction with an interval in the front-rear direction except for a portion located in the obliquely stretchable portion. In the part corresponding to the crack, the net-like elastic member including the crack-corresponding part that goes upward as it goes from the both sides in the width direction toward the center in the width direction, and in a wider area than this part, In the net-like elastic member, at least a portion along the side edge of the crack-corresponding portion of the net-like elastic member is weakened except for a portion located in the diagonally stretchable portion. Or a portion of the mesh that is cut so that it disappears and that is located in the portion corresponding to the crack is not cut, and a continuous portion of the mesh is left along the side edge of the portion corresponding to the crack. The disposable diaper or disposable diaper cover as described.

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