JP4417921B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper using a hook-and-loop fastener.

A liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body interposed between the two sheets, and fastening tapes arranged on the left and right side edges of the back side are attached to predetermined positions on the ventral side. An unfoldable disposable diaper that is worn by being fastened to a fastened portion disposed on the back is well known.
In this type of disposable diaper, all or part of the fastening tape with a male member of the surface fastener, by bonding a female part over the width direction at a predetermined position on the ventral side body portion to form a locking portion, said male part the in pressure contact engagement was locked to the locking portion serving as a female member and to perform fastening, there is adopted a surface fastener mechanism as fastening mechanism.
In recent years, instead of forming the locking portion by bonding the female member, the outer surface of the backsheet with forming a nonwoven fabric sheet, such as by embossing across the width on the ventral side body portion of the backsheet, to form a locking portion to the backsheet itself, it is also known to adopt a surface fastener mechanism, also referred to as target tape-less.
Disposable diapers adopted such a hook-and-loop fastener mechanism, even if the peel with the fastening tape to Sai mounting, lowering of the locking force is hardly observed, also, can fastening with a moderate shear force Excellent fit.
On the other hand, in disposable diapers using this type of hook-and-loop fastener, in order to respond to the movement of the wearer, the flap to which the fastening tape is bonded has elasticity or the fastening tape itself has elasticity. or, or in or to have a stretch in the locking portion forming region, it is common to configure for easy movement wearer to have a stretch belly around. Further, even if the stretchability is not positively imparted in this way, the abdomen extends and contracts due to the elongation of the constituent sheet material accompanying the movement of the wearer.
Japanese Patent No. 3490608 Japanese Patent Laid-Open No. 9-317

However, the conventional disposable diaper locking portion has a structure in which the peel strength from the male material is not different depending on the site, and for example, the fastening tape is pulled to the center portion side to be locked tightly and locked. Sometimes, the fastening tape's shrinking force acts strongly, making it easy to release the lock. Conversely, if you try to attach it loosely and lock it near the side, the fastening tape's shrinking force hardly acts. It was locked with unnecessary strength.
And in this configuration, in order to secure the necessary and sufficient locking state in the state where the stomach is stretched, the peeling strength between the female material sheet and the embossed area constituting the locking portion and the fastening tape is increased. It can only be configured or the fastening tape or side flaps can be stretched easily to loosen the stretching force around the abdomen, but in the aspect of increasing the peel strength, it is not easy to reattach the fastening tape, and the advantage of the hook-and-loop fastener is On the other hand, if the stretching force around the abdomen is weakened, the front and back bodies are likely to be displaced, causing the occurrence of leakage.
In addition, for example, depending on the shape of the abdomen due to the age of the wearer or the hyperactivity such as turning over, the front and rear body may be frequently misaligned. At this time, the fastening tape is used in the product length direction. In many cases, it will be peeled off. Therefore, at this time, the width difference between the front and rear bodies is larger at the side edges in the width direction than at the center part in the width direction of the product, so that both side edges in the width direction are more difficult to peel off than the center part in the width direction of the product. desired.
Then, the main subject of this invention is providing the fastening tape type disposable diaper which can always be made into the latching state of suitable intensity | strength regardless of the fastening position with respect to a securing part. There is.

The present invention that has solved the above-described problems and the effects thereof are as follows.
<Invention of Claim 1>
It has a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body interposed between the two sheets. A fastening tape is arranged, and a part or all of the fastening tape is formed of a male material of a hook-and-loop fastener, and the male material is attached to a locking portion arranged between the left and right side edges of the abdomen or the back side. the locking portion be expanded type disposable diaper worn engaged locks and is provided to extend toward the left and right side edges in the width direction center of the product, and its locking portion, said male part The disposable diaper is characterized in that the peel strength is different stepwise or continuously from the center in the width direction of the product toward the left and right edges.

(Function and effect)
If the locking portion is provided extending from the center in the width direction of the product toward the left and right side edges, the locking portion is formed wide on the front surface of the wearer, so that the locking operation is easy.
Also, it is usually the farthest part of the locking part where the male material is locked. After locking, it is fixed by the influence of stretch of the abdomen, movement of the wearer, body shape of the wearer, etc. It is the central part in the width direction that is unintentionally released from the locked state due to the influence of the pulling in the direction of the left and right side edges of the tape. On the other hand, the right and left side edges are not easily affected by such tension in the normal state, and the locked state is not released unintentionally, but depending on the movement of the wearer, the front and back bodies often shift. Therefore, in a mode in which such a situation often occurs, it can be said that the locked state is easier to be released at both side edges in the width direction than at the center in the width direction of the product.
As for the latching | locking part of this invention, peeling strength with a male material differs stepwise or continuously toward the left-right both-sides edge direction from the width direction center part of a product. That is, the peel strength is lowered or increased stepwise or continuously from the center in the width direction toward the left and right side edges. Whether the height is increased or decreased may be designed according to the assumed wearer age and the mounting mode. For example, if the product has little movement, such as an infant, the peel strength is lowered from the center to the side edges in the width direction, and the product width direction center that is most easily released by stretching around the abdomen It is only necessary that the right and left side edges be unnecessarily firmly locked so that they can be easily peeled off. For example, for infants, on the contrary, the peel strength may be increased from the central portion toward both side edges in the width direction.
In reducing or improving the peel strength in the direction of the left and right side edges, the peel strength may be lowered stepwise by a certain range or continuously decreased.

<Invention of Claim 2>
The locking portion is constituted by a set of a plurality of locking section unit, the arrangement density of the engaging section unit, the peel strength is different from the disposable diaper of claim 1, wherein.

(Function and effect)
When made different peel strength, configured by a set of a plurality of engaging section unit locking portion as claimed in claim 2, can be achieved easily if Seshimere differs depending on the arrangement density of the engaging section unit. For example, a rectangular or round piece of hook-and-loop female material can be affixed to the back sheet densely in the center and coarsely as it goes to the left and right edges, or without target tape. For example, a rectangular or round embossing region may be provided so as to become rougher toward the left and right side edges densely in the center.

<Invention of Claim 3>
Engaging portion is formed by bonding a female member of the surface fastener to the backsheet, and, by its female female variation of the density or height of the element of the material, the peel strength is different, the claim The disposable diaper according to 1.

(Function and effect)
In making the peel strength different, the female material of the hook-and-loop fastener is formed by adhering to the back sheet as in claim 3 of the present invention, and the difference is made by changing the density or height of the female element of the female material. But it can be easily achieved. Note that the female element is a loop or arch of a fiber formed in the locking surface of the female member. The surface fastener, it goes without saying that this loop or arch adhesion napped shaped male element and engaging to both wood such as hook-shaped or mushroom-shaped膨頭form of male member is made.

<Invention of Claim 4>
The disposable diaper according to claim 1, wherein a part of the back sheet itself is a locking portion.

(Function and effect)
In the present invention, a part of the back sheet itself can be the locking portion. For example, the outermost layer of the back sheet is a non-woven fabric, and a female element to which a male material is locked is formed on a part of this to form a locking portion. This is a so-called target tapeless mode. As a method for forming the locking portion, an appropriate method such as embossing, wave processing, or processing for fluffing with a pin or the like can be employed.
Here, if embossing is employed, the embossing can be easily achieved by varying the depth or density of the embossing when varying the peel strength. For example, when embossing is performed, the female element is crushed. The peel strength changes depending on the degree of crushing, but the deeper and denser the embossing is, the more the female element is crushed and the peel strength at that portion becomes lower. Therefore, when the outer surface of the back sheet is a target tapeless formed of a fiber sheet such as a non-woven sheet, by roughening the embossing from the central part toward the left and right side edges, or by reducing the embossing depth, The peel strength can be made different.

<Invention of Claim 5>
The disposable diaper according to claim 4, wherein the embossed pattern is a pattern arranged along the MD direction or the CD direction when the back sheet is formed.

(Function and effect)
If the emboss pattern is a pattern arranged along the MD direction or the CD direction when the back sheet is formed, the fiber fluff is less when the fastening tape is peeled off.
In particular, the back sheet is embossed in the direction along the CD direction, considering that the longitudinal direction of the product (the direction from the back side to the ventral side in the unfolded state) is generally the MD direction. More preferably, a pattern is arranged.

<Invention of Claim 6>
The disposable diaper according to any one of claims 1 to 5, wherein the space between the left and right side edges of the back side part expands and contracts.

(Function and effect)
By allowing the left and right side edges of the back side portion to expand and contract, it is possible to increase the permissible range of stretching deformation around the abdomen due to the body shape or movement of the wearer.

<Invention of Claim 7>
The disposable diaper according to any one of claims 1 to 6, wherein a part or all of the fastening tape expands and contracts in the width direction of the product .

(Function and effect)
When a part or all of the fastening tape expands and contracts in the width direction, the allowable range of expansion / contraction deformation around the abdomen due to the body shape or movement of the wearer can be increased, as in the invention of claim 6.

Or as described, according to the present invention may be a locked state of where always suitable strength be secured in the locking portion. In particular, a fastening tape that can be firmly locked at the center where it is easy to be released due to the influence of stretching around the abdomen. A disposable diaper of the type is provided.

Here, the measurement method of peel strength referred to in the present invention or specification is because unless the measuring method is not particularly limited to change the measuring method In measuring the respective portions of the engaging portion, and the short male part and a female member What is necessary is just to measure by the method which can measure the force when making it peel after joining. A particularly suitable method for measuring peel strength will be described later.

Further, there is the fact that the locking force out ease of engagement of the fastening tape for engagement portion in a mounted state herein.

Next, embodiments of the present invention will be described in detail below with reference to the drawings.
(First embodiment)
FIG. 1 shows a stationary disposable diaper Z1 according to the present invention. The disposable diaper Z includes a liquid-permeable top sheet 11 positioned on the user's skin side, a liquid-impervious back sheet 12 positioned outside the product and substantially impermeable to liquid, and a space between them. For example, a rectangular or preferably hourglass-shaped absorber 13 having a certain degree of rigidity, and fastening tapes Y1 and Y2 for fastening are arranged on the left and right edges of the back side.

The fastening tape Y1, Y2 are formed in the male part y1, y2 of the exception surface fastener the site being bonded to the left and right side edges, engaging portions X1, X2 of the male member is locked is of the backsheet 12 It is arranged on the outer ventral side.

The back sheet 12 is wider than the absorbent body 13 and has a substantially rectangular shape in which the left and right side edges are cut into a circular arc shape at a substantially central portion in the longitudinal direction, and is impermeable to liquid such as a polyethylene film. A non-woven fabric sheet 12B for exterior is laminated on the outer surface of the film sheet 12A, and these are pressed and formed by embossing or the like performed through a hot melt adhesive. The outer nonwoven sheet 12B is a dense surface of the fiber loop, the fibers arch is configured so as not to is the male member and the locking. In this embodiment, it is not always necessary to dispose the nonwoven fabric sheet, and the back sheet can be formed only from the liquid-impermeable film sheet.

  Here, it is desirable that the back sheet 12 is configured to have a moisture permeability of 0.5 to 4.0 g / 100 cm 2 hr, and the liquid-impermeable film sheet 12A and the nonwoven fabric sheet 12B are 115 to 115%. It is desirable that they are bonded so as to have a peel strength of 135 g / 25 mm. The peel strength is a speed of 300 mm / min from one end of the back sheet 12 under conditions of 25 ° C. and 65% RH, sampled in the width direction (lateral direction) of the original fabric with a width of 25 mm and a length of 100 mm. It means 180 degree peeling strength when peeling.

  The liquid-impervious film sheet 12A used for the back sheet 12 can be a known liquid-impervious film sheet used as the back sheet 12 of the absorbent article, and is not particularly limited. Specific examples include various synthetic resin sheets such as polyethylene sheets, polypropylene sheets, polyurethane sheets, and polyethylene terephthalate sheets, and a porous structure provided with a large number of fine ventilation holes for imparting air permeability to these synthetic resin sheets. Synthetic resin sheets and the like can be mentioned. The thickness and rigidity of the liquid-impervious film sheet may be appropriately selected according to known standards in consideration of the thickness and rigidity of the laminated nonwoven sheet.

  As the non-woven sheet used for the back sheet 12, known non-woven sheets used for the back sheet of the absorbent article can be used, for example, synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters and polyamides, rayon and cupra. For webs made of recycled fibers such as cotton, natural fibers such as cotton, etc., formed by performing appropriate processing such as spunlace method, spunbond method, thermal bond method, melt blown method, needle punch method, heat shrink method, etc. A nonwoven fabric or the like can be used. Of the processing methods, the spunlace method is excellent in that it is rich in flexibility and drapeability, and the thermal bond method is excellent in that it is bulky and rich in software, and can be appropriately selected according to the purpose. Here, the nonwoven fabric sheet may be a laminated nonwoven fabric sheet. For example, a spunbond nonwoven fabric (S) layer in which a web is formed by a spunbond method; and a meltblown nonwoven fabric layer (M) in which a web is formed by a meltblown method A nonwoven fabric laminate in which two or more layers are appropriately laminated can be used as a material.

On the other hand, the locking portion X1 is formed by attaching a hot-melt adhesive Mesuzai sheet to the backsheet 12. The engaging portion X1 is provided to extend from the product widthwise center toward the left and right side edges in the product ventral. In the illustrated example, the locking unit has been horizontally long rectangular as desired form, but is not specifically limited to a rectangle. Other shapes may be used. The bonding method to the back sheet 12 may be an appropriate known method according to the female material to be used.

Here, the locking portion X1 of the present invention is characterized in that the peel strength between the male material of the fastening tapes Y1 and Y2 and y1 and y2 is stepwise from the center in the width direction of the product toward the left and right edges. It is configured to change. In the illustrated example, have engaging portions X1 is divided into 5 sections, so that the relationship between the partition and the peel strength in FIG. 3 is shown, the highest peel strength of the compartment D1 located in the center, adjacent to It is comprised so that peeling strength may fall in order of the division D2 and the division D3 adjacent to the division D2. Although the specific peel strength of each section can be determined as appropriate, it is generally desirable that the peel strength is divided into stages with a difference in the range of 100 gf to 1500 gf, preferably 140 to 400 gf. Incidentally, the peel strength is not sufficient engagement is obtained is less than 100 gf, exceeds 1500 kgf, etc. Sai peeled wearing too locking force is strong fuzz locking portion is likely to occur. In addition, the measuring method of this peeling strength is measured as follows. First, two cloth tapes of width 50 mm × length 100 mm are woven in the width direction to form a two-fold cloth tape of width 25 mm × 100 mm, and a fastening tape is firmly attached to one end of the cloth tape. At this time, the male material of the fastening tape is positioned outside the tip of the cloth tape.

  On the other hand, the female material concerning this invention is affixed on a stainless steel flat plate with a double-sided adhesive tape with the female element forming surface as the upper surface. Furthermore, both ends are fixed with craft tape.

  Next, after the male material and the female element forming surface are brought into contact with each other, the fastening tape and the female base sheet are pressed against each other by reciprocating from the cloth tape side with a roller having a mass of 2 kg. Further, a 1 kg weight is suspended from the other end of the cloth tape on the opposite side of the fastening tape for 10 seconds, and a shearing force is applied to the crimping portion to ensure the locking.

  Thereafter, the stainless steel flat plate and the other end of the cloth tape opposite to the fastening tape are chucked with a jig of a tensile tester. At this time, the tensile direction of the jig for chucking the other end of the cloth tape on the opposite side of the cloth tape with respect to the stainless steel flat plate is set to 90 °.

  Thus, after setting the jig on the tensile tester so that the final peel angle is 90 °, the crimped part is peeled off at 300 mm / min, and the uneven weight average value measured at that time is defined as the peel strength. The measured value is an average of 3 to 10 effective measured values. In addition, in the measurement, the sample is set so that the measurement is in the CD-to-CD direction. Furthermore, the size of the test piece is set to be 47 mm ± 3 mm (MD direction) × 93 mm (CD direction) of the male material and 23.5 ± 1.5 mm (MD direction) × 24 mm (CD direction) of the female base sheet. .

  On the other hand, the number of sections of the locking portion is not limited to the five sections in the illustrated example, and may be three sections or five sections or more. However, if the peel strength is to be lowered step by step, it is desirable that the compartment has a size that accommodates the male material formed on the fastening tape.

  Note that, in this embodiment, the peel strengths of the sections located in line symmetry with respect to the center line in the product width direction are configured to be the same, but they are not necessarily the same.

Furthermore, as the relationship between the position of the peel strength and the locking portion shown in FIG. 4, configured without providing the partition to continuously peel strength from the central portion of the product width direction toward the opposite side edges is reduced May be.

Further, the locking portion X1 regardless of the partition, the shear force between the male part of the fastening tape, 1Kg～10kg, preferably it is desirable to design such that the 3～8Kg. If it is less than 1 kg, the lock is easily released, and if it exceeds 10 kg, the lock is too strong. In addition, the measuring method of this shear force is measured as follows. First, a female base sheet according to the present invention is attached to a stainless steel flat plate with a double-sided adhesive tape with the female element forming surface as an upper surface. Furthermore, both ends are fixed with craft tape. At this time, a blank of a flat plate made of stainless steel is left around the female base sheet.

  Next, after the male material of the fastening tape is brought into contact with the female element forming surface, the male material and the female base sheet are pressed against each other by reciprocating from the cloth tape side with a roller having a mass of 2 kg.

  Thereafter, the blank portion of the stainless steel flat plate and one end of the fastening tape are chucked with a jig of a tensile tester. At this time, the distance between chucks is set to 50 mm. Thus, when the chucking is completed, the jig is pulled in the shear direction between the male material and the female base sheet at a tensile speed of 30 mm / min, and the maximum shear force is measured. The measured value is an average of 3 to 10 effective measured values. In addition, in the measurement, the sample is set so that the measurement is in the CD-to-CD direction. Furthermore, the size of the test piece is set to be 47 mm ± 3 mm (MD direction) × 93 mm (CD direction) of the male material and 23.5 ± 1.5 mm (MD direction) × 24 mm (CD direction) of the female base sheet. .

Here, a female member of the surface fastener constituting the locking portion X1 is composed of a sheet material comprising a female element suitable for engaging with a male part provided on the fastening tape Y1, Y2, in the conventional example Various known female material sheets themselves can be used. For example, the female material sheet may be a web made of natural fibers such as woven fabric, synthetic fibers, regenerated fibers, cotton, etc., in which a large number of loop-shaped or arch-shaped female elements are formed on one side, and an appropriate material such as a spunlace method. A nonwoven fabric in which a number of loop-shaped and arch-shaped female elements are remarkably formed on one side by applying a processing method, or a non-woven fabric formed by sticking it to a base sheet can be used. Here, when allowed to achieve a difference in stepwise or continuous peel strength in each section of the locking portion X1 as described above, for example, the use of the female part to differences in the density of the female element for each compartment Good. Further, it can be achieved by appropriately crushing the female element by embossing one female material sheet for each section.

On the other hand, the male part of the surface fastener that constitutes a part or the whole of the fastening tape Y1, Y2 is hooked or mushroom-shaped膨頭form such napped of locking the female element of the female member used in the engaging portion It is comprised with the male material sheet | seat which has a shape-like male element. A method for producing a fastening tape from the male sheet is based on a known method. There is no particular limitation. Further, the size, density, etc. of the napped male element such as a bowl-shaped or mushroom-shaped bulged shape may be appropriately selected within a range where an appropriate peel strength is obtained in relation to the female material.

  On the other hand, although not shown, the disposable diaper Z1 of the present embodiment is provided with a large number of elastic elastic rubber threads extending in the direction between the fastening tapes, and the backside fastening tapes Y1 and Y2 expand and contract. It is configured as follows. As a result, the permissible range of fastening of the fastening tapes Y1 and Y2 at the time of fastening is widened, so that the permissible range of fastening due to differences in the wearer's body shape is widened. In addition, the fit at the time of wearing is improved by expansion and contraction. Rather than making the backside fastening tapes Y1 and Y2 expand and contract by the thread rubber, an appropriate expansion and contraction member such as an elastomer sheet is interposed between the distal ends and the base ends of the fastening tapes Y1 and Y2. In addition, a male material of a hook-and-loop fastener may be arranged on the distal end side of the interposed elastic member so that the fastening tapes Y1 and Y2 themselves expand and contract. Further, by inserting an elastic member such as an elastomer sheet between a so-called side slap portion to which the fastening tapes Y1 and Y2 are bonded and another portion, the backside fastening tapes Y1 and Y2 are expanded and contracted. You may comprise. Even if comprised in this way, the improvement effect of the tolerance | permissible_range with respect to a feeling of a fit improvement and a difference in a body shape is acquired. In addition, about the expansion | extension force of a thread rubber or an elastic member, it can design without a problem in the range employ | adopted for a known disposable diaper.

  On the other hand, the top sheet 11 has the same shape as the back sheet 12 in this embodiment, extends outward from the side edge of the absorber 13, and is bonded to the back sheet 12 by a hot melt adhesive or the like. The surface sheet 11 is a laminate obtained by laminating a plastic film such as a polyethylene film, or a plastic film and a nonwoven fabric as long as liquid permeability can be secured in addition to various nonwoven fabrics such as a spunbond nonwoven fabric, an air-through nonwoven fabric, an SMS nonwoven fabric, and a point bond nonwoven fabric. Nonwoven fabrics can also be used. Further, a net-like material in which yarns such as nylon and polyethylene terephthalate are plain woven can be used.

  The absorbent body 13 is formed by covering a fiber assembly made of piled pulp or tow with an absorbent polymer contained therein, such as a pulp sheet. Examples of fibers constituting the fiber assembly (hereinafter simply referred to as tow constituent fibers) include polysaccharides or derivatives thereof (cellulose, cellulose ester, chitin, chitosan, etc.), synthetic polymers (polyethylene, polypropylene, polyamide, polyester). , Polylactamamide, polyvinyl acetate and the like), and cellulose ester and cellulose are particularly preferable.

  Examples of the superabsorbent polymer include carboxymethyl cellulose, polyacrylic acid and salts thereof, crosslinked acrylate polymer, starch-acrylic acid graft copolymer, starch-acrylonitrile graft copolymer hydrolyzate, polyoxyethylene A cross-linked product, a cross-linked product of carboxymethyl cellulose, a partially cross-linked columnar polymer such as polyethylene oxide and polyacrylamide, or a copolymer of isobutylene and maleic acid is preferably used. What added the blocking inhibitor in order to suppress the blocking property by moisture absorption of a product can also be used. In addition, the superabsorbent polymer has various forms such as powder, particles, granules, pellets, sol, suspension, gel, film, and nonwoven fabric. Any of them can be used in the present invention, and a particulate material is particularly preferably used.

  In addition, the absorbent article of this invention is not necessarily limited to this form. For example, it can be set as the form which distribute | arranged elastic elastic members, such as a thread rubber used in a disposable diaper etc., to various places. A second sheet may be provided between the surface sheet and the absorbent body for the purpose of body fluid diffusion or the like.

(Second Embodiment)
In the first embodiment, the female member has a form which is affixed to the backsheet as engaging portions X1, X2 of the fastening tape Y1, Y2, the second embodiment, sticking a female member to the backsheet instead of a form, also referred to as locking portions X1, X2 formed was called target tape-less a female member by applying an appropriate embossing a portion of the outer surface of the backsheet 12 itself. The disposable diaper Z2 concerning this 2nd Embodiment is shown in FIG. Hereinafter, the second embodiment will be described with a focus on differences from the first embodiment.

The backsheet 12 according to the first embodiment, necessarily need not to arrange the exterior nonwoven fabric sheet 12B, in the second embodiment, always nonwoven sheet on the outer surface side for engaging portions formed with for soft improvement 12B or a woven fabric sheet is arranged. The bonding mode between the nonwoven fabric sheet 12B and the liquid-impermeable film sheet 12A is pressure-bonded by embossing or the like performed via a hot melt adhesive. The nonwoven sheet 12B, a suitable basis weight, 10~100g / m ^2, more preferably from 20 to 60 g / m ^2. When the basis weight of the nonwoven fabric sheet is less than 10 g / m ² , the space around the male material is not sufficiently maintained, and when the fastening tape is peeled off, the nonwoven fabric sheet is destroyed and exceeds 100 g / m ^2. , unfavorable with productivity of the nonwoven fabric sheet becomes worse, since fastening of the fastening tape to a site other than the engaging portion becomes remarkable.

On the other hand, the backsheet 12 of the present embodiment, in the range including the range where the locking portion X1 is formed, between the exterior nonwoven sheet 12B and a liquid-impervious film sheet 12A, an intermediate nonwoven sheet 12C is disposed Yes. By interposing the intermediate nonwoven sheet 12C, become excellent pushing sensation when the site was brought into pressure contact with the fastening tape Y1, Y2 becomes bulky the engaging portion X1, also delamination strength is improved Delamination of the exterior nonwoven fabric sheet 12B accompanying the peeling off of the fastening tapes Y1 and Y2 is prevented. Here, it is desirable that the liquid-impermeable film sheet 12A and the nonwoven fabric sheet 12B at the intervening portion of the intermediate nonwoven fabric sheet 12C have a peel strength of 175 to 195 g / 25 mm. The peel strength is obtained by sampling the back sheet 12 under conditions of 25 ° C. and 65% RH in a width direction (lateral direction) of the original fabric with a width of 25 mm and a length of 100 mm, and a speed of 300 mm / min from one end. 180 degree peeling strength when peeling.

Emboss imparted methods for forming the engaging portion by a known method. For example, after manufacturing the back surface sheet 12, an embossing apparatus including a convex embossing roll in which a convex pattern for embossing is formed at a predetermined position, and a rubber roll having flexibility to the extent that the convex portion of the convex embossing roll facing the embossing roll is pushed in. It is preferable to supply and apply the nonwoven fabric sheet side to the convex embossing roll side. In addition, you may use an embossing apparatus provided with the concave embossing roll in which the recessed part corresponding to the convex part of a convex embossing roll was formed. Incidentally, the locking unit of the embodiment also includes a 5 compartments differ similarly peel strength with the first embodiment. The difference in peel strength for each compartment is made different depending on the emboss density. It can be made different depending on the embossing depth.

In addition, what specific emboss depth and emboss density are used depends on the basis weight of the nonwoven fabric sheet and the configuration of the male material. Design appropriately. Here, the embossed pattern imparts a locking portion, it can be adopted a known pattern to be performed in this type of target tape-less type, preferably embossed along the MD direction or the CD direction at the time of the backsheet formed It is a pattern that is arranged. This pattern is usually a pattern in which embossing along the longitudinal direction or the width direction is arranged at the time of the product, and therefore, there is less fuzz due to peeling off of the fastening tape.

  In particular, although not shown, when the emboss is arranged along the product longitudinal direction, it is excellent in terms of stretchability and breathability around the stomach. Although it depends on the manufacturing method, considering that the manufacturing method in which the MD direction of the back sheet is the product width direction is a common manufacturing method, the emboss pattern is a pattern along the CD direction when the back sheet is formed. Good. Here, in the present invention, being provided along the longitudinal direction of the product is not necessarily limited to that by linear embossing, and even a zigzag embossing long in the longitudinal direction of the product is along the longitudinal direction of the product. is there. Moreover, although not shown in figure, the elliptical emboss pattern whose product longitudinal direction becomes a long side is also along a product longitudinal direction. The longitudinal direction of embossing should just be along the product longitudinal direction.

The configuration other than the configuration unique to the second embodiment is the same as that of the first embodiment. For example, the topsheet, absorbent body, the position of the locking portion, the range, size, and configuration of the fastening tape is the same as in the first embodiment.

(Third embodiment)
The disposable diaper Z3 concerning 3rd Embodiment is shown in FIG. Disposable diaper Z3 according to the third embodiment, the locking portion X1 plurality of engaging section unit x, which is formed by a set of x .... These locking part units x, x... Are formed by segmenting a female material sheet of a hook-and-loop fastener. The locking unit, these engaging section unit x, x ... of which size is formed from 5 compartment differs, peel strength have the greatest locking section unit is used in the compartment D1 located in the center There are highest compartment D2 adjacent thereto, to further its being small size of the engaging portion unit used in the order of sections D3 adjacent to the compartment D2, with peel strength toward the both side edges may lower It is configured. Incidentally, the locking section unit x, as the same x ... size of each partition may be configured to peel strength between the male member is different in each section by the difference of the arrangement density. Other configurations are the same as those of the first embodiment.

(Other)
In each of the above embodiments, the peel strength decreases from the center in the product width direction toward the left and right side edges. On the contrary, in the present invention, the locking portion is directed from the center in the product width direction to the left and right side edges. The peel strength may be increased. In this case, the manner in which the female material peel strength of the locking portion is different is based on the above aspect.

  The present invention can be used for disposable diapers using a hook-and-loop fastener mechanism as well as disposable products such as surgical clothes and packaging materials using the hook-and-loop fastener mechanism.

It is an expanded view of the 1st form which shows the fastening tape type disposable diaper concerning this invention. It is a figure for demonstrating the stepwise difference of peeling strength. It is a figure for demonstrating the case where peeling strength changes continuously. It is a top view of the disposable diaper of the 2nd form. It is a top view of the disposable diaper of the 3rd form.

X1 ... engaging portion, Y1, Y2 ... fastening tape, y1, y2 ... male part, Z1, Z2, Z3 ... disposable diapers, 11 ... surface sheet, 12 ... back sheet, 12A ... liquid-impervious film sheet, 12B, 12C ... non-woven fabric sheet, E ... emboss, ST ... ventral side longitudinal edge.

Claims (7)

It has a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body interposed between the two sheets. A fastening tape is arranged, and a part or all of the fastening tape is formed of a male material of a hook-and-loop fastener, and the male material is attached to a locking portion arranged between the left and right side edges of the abdomen or the back side. A deployable disposable diaper to be locked and worn, wherein the locking portion is provided to extend from the center in the width direction of the product toward the left and right side edges, and the locking portion is the male material The disposable diaper is characterized in that the peel strength is different stepwise or continuously from the center in the width direction of the product toward the left and right edges.   The disposable diaper according to claim 1, wherein the locking part is constituted by a set of a plurality of locking part units, and the peel strength varies depending on the arrangement density of the locking part units.   The locking portion is formed by adhering a female material of a hook-and-loop fastener to a back sheet, and the peel strength varies depending on a change in density or height of a female element of the female material. The disposable diaper according to 1.   The disposable diaper according to claim 1, wherein a part of the back sheet itself is a locking portion.   The disposable diaper according to claim 4, wherein the embossed pattern is a pattern arranged along the MD direction or the CD direction when the back sheet is formed.   The disposable diaper according to any one of claims 1 to 5, wherein the space between the left and right side edges of the back side part expands and contracts. The disposable diaper according to any one of claims 1 to 6, wherein a part or all of the fastening tape expands and contracts in the width direction of the product .

Images