JP2005118533A - Absorptive article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorptive article having a back sheet with high gas permeability, and having a dislocation preventive part without leaving an adhesive on underwears. <P>SOLUTION: A napkin 1 has a top sheet 2 positioned on a surface abutting on the human body, the back sheet 3 positioned on a surface on the opposite side of the top sheet 2 and a surface abutting on the underwear, an absorber 4 interposed between the top sheet 2 and the back sheet 3, and the dislocation preventive part 6 arranged on an underwear abutting surface of the back sheet 3 and applied with the adhesive. The back sheet 3 is composed of two layers of a nonwoven fabric layer 3A positioned on the underwear side and a film layer 3B positioned on the absorber 4 side. The dislocation preventive layer 6 is formed in an exposure part 7 of exposing the film layer 3B from the nonwoven fabric layer 3A. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an absorbent article.

Conventionally, sanitary napkins as absorbent articles are, for example, a liquid-permeable top sheet provided on a skin contact surface in contact with a human body and an impermeable material provided on a non-skin contact surface on the side opposite to the top sheet. A liquid back sheet, an absorber provided between the top sheet and the back sheet, and a slip stopper provided in the back sheet are provided.
For such sanitary napkins, by using a back sheet laminated with a film and a laminated nonwoven fabric with high air permeability, the air permeability is improved while being a liquid-impermeable sheet, A sanitary napkin that prevents stuffiness and improves the feeling of use is known (for example, Patent Document 1).
JP 2003-24375 A

  However, in the case of the sanitary napkin of Patent Document 1, the slip stopper is located on the nonwoven fabric surface that is the underwear contact surface. When an adhesive such as a hot melt adhesive is applied to the nonwoven fabric layer, Due to the uneven structure, the strength of the bonding interface is weakened. As a result, when an adhesive is applied to the nonwoven fabric layer, a napkin with a slip stopper is attached to the undergarment, and if it is peeled off from the undergarment after use, interfacial peeling occurs between the slip stopper and the nonwoven fabric layer, and the underwear There was a problem that the adhesive remained on the surface.

  Then, the subject of this invention is providing the absorbent article which has a slip prevention part which has a back sheet | seat with high air permeability, and an adhesive agent does not remain in underwear.

In order to solve the above-described problem, the invention according to claim 1 includes a top sheet positioned on a surface that contacts the human body, and a bag positioned on the surface that is opposite to the top sheet and contacts the underwear. An absorbent article comprising: a sheet; an absorbent body interposed between the top sheet and the back sheet; and a slip stopper provided on an underwear contact surface of the back sheet and coated with an adhesive. The backsheet is composed of two layers, a nonwoven fabric layer located on the underwear side and a film layer located on the absorber side, and the slip stopper is formed in an exposed portion where the film layer is exposed from the nonwoven fabric layer. It is characterized by being.
This makes it possible to form the misalignment-preventing portion on the film while keeping the underwear contact surface non-woven.

According to a second aspect of the present invention, in the absorbent article according to the first aspect, the exposed portion is formed by the non-woven fabric layer being pierced.
This makes it possible to form the misalignment-preventing portion on the film while keeping the underwear contact surface non-woven.

The invention according to claim 3 is the absorbent article according to claim 1 or 2, characterized in that an adhesive is applied to the entire surface of the exposed portion where the misalignment stop portion is formed.
Thereby, an adhesive agent will be apply | coated to the exposed film layer whole surface, and the non-adhesion area | region in an exposed part can be eliminated.

  The invention according to claim 4 is the absorbent article according to any one of claims 1 to 3, wherein the tensile strength of the film layer is at least equal to or greater than the peel strength between the adhesive and the undergarment of the slip stopper. It is characterized by being.

  The invention according to claim 5 is the absorbent article according to claim 4, wherein the tensile strength of the film layer is 4.0 (N / 25 mm) or more in the longitudinal direction, The peel strength from the underwear is characterized by being lower than 4.0 (N / 25 mm).

According to a sixth aspect of the present invention, there is provided a top sheet positioned on a surface that contacts the human body, a back sheet positioned on a surface opposite to the top sheet and in contact with underwear, the top sheet, and the back An absorbent article comprising an absorbent body interposed between the sheet and an underwear contact surface of the back sheet, and a slip stopper to which an adhesive is applied, wherein the back sheet includes the absorption The nonwoven fabric layer is composed of a film layer located on the body side and a nonwoven fabric layer located on the underwear side, and the size is at least equal to or greater than that of the displacement prevention portion between the deviation prevention portion and the nonwoven fabric layer. It is characterized in that a smaller reinforcing film layer is arranged.
This makes it possible to form the misalignment-preventing portion on the film while keeping the underwear contact surface non-woven.

The invention according to claim 7 is the absorbent article according to claim 6, wherein the tensile strength of the film layer of the back sheet is 4.0 (N / 25 mm) or more and the basis weight is 25 (g / m ² ). The basis weight of the entire back sheet is 40 (g / m ² ) or less.

According to an eighth aspect of the present invention, there is provided a top sheet positioned on the surface that contacts the human body, a back sheet positioned on the surface opposite to the top sheet and contacting the underwear, the top sheet, and the back An absorbent article comprising: an absorbent body interposed between the sheet and an underwear abutting surface of the back sheet, and a slip stopper to which an adhesive is applied. The back sheet includes a nonwoven fabric layer. A reinforcing film layer having a size at least equal to or greater than that of the misalignment prevention portion and smaller than the nonwoven fabric layer is disposed between the misalignment prevention portion and the nonwoven fabric layer. To do.
This makes it possible to form the misalignment-preventing portion on the film while keeping the underwear contact surface non-woven.

The invention according to claim 9 is the absorbent article according to claim 8, wherein the water resistance of the back sheet is 70 (mm) or more and the basis weight is 200 (g / m ² ) or less. To do.

  The invention according to claim 10 is the absorbent article according to any one of claims 6 to 9, wherein the reinforcing film layer has substantially the same shape and size as the misalignment stopper. To do.

  The invention according to claim 11 is the absorbent article according to any one of claims 6 to 10, wherein the tensile strength of the reinforcing film layer is at least the peel strength between the adhesive of the misalignment stop and the undergarment. It is the above.

  The invention according to claim 12 is the absorbent article according to claim 11, wherein the tensile strength of the reinforcing film layer is 4.0 (N / 25 mm) or more in the longitudinal direction, and The peel strength between the adhesive and the undergarment is characterized by being lower than 4.0 (N / 25 mm).

According to the first aspect of the present invention, it is possible to form the misalignment-preventing portion on the film while keeping the underwear contact surface as a non-woven fabric.
As a result, an adhesive such as a hot melt adhesive can be applied to the film surface rather than the non-woven fabric surface having an uneven surface where the adhesive force is not sufficiently exerted, so that the adhesive sufficiently penetrates and adheres to the back sheet. Thus, when the absorbent article is peeled from the underwear, the adhesive surely follows the film side, and the adhesive does not remain on the underwear surface.
Moreover, since it is comprised with the nonwoven fabric and the film or the film except the area | region where the adhesive agent was apply | coated, it is excellent in air permeability and can prevent a swelling.
Furthermore, since it has a two-layer structure consisting of a nonwoven fabric layer and a film layer, the strength of the sheet itself can be improved as compared with the case of only the film layer.
In addition, since the non-woven fabric layer is pierced only at the location where the misalignment prevention portion is applied, the non-woven fabric will face the underwear contact surface side of the portion other than the misalignment prevention portion, so that the cross-likeness is not lost and the user is soft. The appearance can be expected.

  According to the invention described in claim 2, it is natural that the effect of the invention described in claim 1 can be obtained. , A desired misalignment pattern can be formed.

According to the invention described in claim 3, the effect of the invention described in claim 1 or 2 is naturally obtained, and the adhesive is applied to the entire exposed film layer, so that the exposed portion It is possible to eliminate the non-adhesive region.
Accordingly, if a non-adhesive region is formed in the exposed portion, when a force is applied to peel off the absorbent article from the outside, the force is also transmitted to the non-adhesive region, and the non-adhesive region The region is pulled to cause peeling, and not only the adhesive but also the film layer itself does not follow the napkin 1 and remains on the underwear surface, but the non-adhesive region that causes this peeling is not formed. Therefore, it is possible to prevent the peeling and to remove the absorbent article without leaving a film layer or an adhesive on the underwear surface.

  According to the invention described in claim 4, it is natural that the effect of the invention described in any one of claims 1 to 3 is obtained, and the tensile strength of the film layer is at least the adhesive of the misalignment stop portion. This means that the peel strength of the undergarment is higher than that, so that when the absorbent article fixed to the undergarment is peeled off, the film can be surely peeled off without tearing or tearing.

  According to the invention described in claim 5, it is natural that the effect of the invention described in claim 4 can be obtained, and the tensile strength of the film layer is 4.0 (N / 25 mm) or more in the longitudinal direction. Therefore, the peel strength between the adhesive and the undergarment in the misalignment portion is lower than 4.0 (N / 25 mm), thereby preventing the film of the absorbent article fixed to the undergarment from being broken or torn. It can be peeled off more reliably.

According to the invention described in claim 6, the misalignment preventing portion can be formed on the film while the underwear contact surface is made of the nonwoven fabric.
As a result, an adhesive such as a hot melt adhesive can be applied to the reinforcing film layer as a film surface instead of a non-woven fabric surface having an uneven surface where the adhesive force is not sufficiently exhibited. When the absorbent article is peeled off from the undergarment, the adhesive applied to the misalignment will surely follow the reinforcing film layer, leaving the adhesive on the undergarment surface. It can be removed without any problem.
Moreover, since it is comprised with the nonwoven fabric and the film except the part by which the film layer for reinforcement was distribute | arranged, it is excellent in air permeability and can prevent a swelling.
Furthermore, since the back sheet has a two-layer structure including a nonwoven fabric layer and a film layer, the strength of the sheet itself can be improved as compared with the case of only the film layer.
In addition, the non-woven fabric will face the underwear contact surface side except for the portion where the reinforcing film layer is arranged, and the appearance that makes the user expect softness without losing cross-likeness can be achieved. .
And, without processing the nonwoven fabric layer and the film layer itself constituting the back sheet, it is possible to provide a shift stopper only by newly arranging the reinforcing film layer on the underwear contact surface of the back sheet, An appropriate misalignment stopper can be provided more easily.

According to the invention described in claim 7, it is natural that the effect of the invention described in claim 6 can be obtained, the tensile strength of the film layer of the back sheet is 4.0 (N / 25 mm) or more, and the basis weight. The amount is 25 (g / m ² ) or less, and the basis weight of the entire back sheet is 40 (g / m ² ) or less.
As a result, the film layer, that is, the back sheet has sufficient tensile strength, and the back sheet is thinned at the same time as it is not torn or torn, and the absorbent article is soft. It is possible to realize a feeling of use with little discomfort.

According to the eighth aspect of the present invention, the slip stopper can be formed on the film while the underwear contact surface is a non-woven fabric, and at the same time, the back sheet is composed only of the non-woven fabric.
As a result, an adhesive such as a hot melt adhesive can be applied to the reinforcing film layer as a film surface instead of a non-woven fabric surface having an uneven surface where the adhesive force is not sufficiently exhibited. When the absorbent article is peeled off from the undergarment, the adhesive applied to the misalignment will surely follow the reinforcing film layer, leaving the adhesive on the undergarment surface. It can be removed without any problem.
Moreover, since it is comprised with the nonwoven fabric except the part by which the film layer for reinforcement was distribute | arranged, it is excellent in air permeability and can prevent stuffiness.
Furthermore, since the back sheet has a single-layer structure composed of only the nonwoven fabric layer, the back sheet itself becomes thin and soft.
In addition, the non-woven fabric will face the underwear contact surface side except for the portion where the reinforcing film layer is arranged, so that the appearance that makes the user expect softness without losing cross-likeness. I can do it.
And, without processing the nonwoven fabric layer or the film layer itself constituting the backsheet, it is possible to provide a shift stopper only by newly arranging the reinforcing film layer on the underwear contact surface of the backsheet, An appropriate misalignment stopper can be provided more easily.

According to the invention described in claim 9, it is natural that the effect of the invention described in claim 8 can be obtained, the water pressure resistance of the back sheet is 70 (mm) or more, and the basis weight is 200 (g / m). ² ) It will be the following.
As a result, the back sheet has sufficient water pressure resistance, preventing leakage of bodily fluid from the back sheet side, and at the same time, the back sheet becomes thin, so that the absorbent article has softness and less discomfort. A feeling of use can be realized.

According to the invention described in claim 10, it is natural that the effects of the invention described in any of claims 6-9 can be obtained, and the shape and size of the reinforcing film layer and the misalignment stopper are substantially the same. It will be the same.
As a result, the non-woven fabric layer will surely face the underwear contact surface side except for the portion where the misalignment stop portion is arranged, and the appearance that makes the user expect more softness without losing cross-likeness. I can do it.

According to the eleventh aspect of the invention, it is natural that the effect of the invention according to any one of the sixth to tenth aspects is obtained, and the tensile strength of the reinforcing film layer is at least the adhesion of the misalignment portion. It will be more than the peel strength between the agent and the undergarment.
Thereby, when removing the absorbent article fixed to the undergarment, it can be surely peeled off without tearing or tearing the reinforcing film layer.

According to the invention described in claim 12, the effect of the invention described in claim 11 is naturally obtained, and the tensile strength of the reinforcing film layer is 4.0 (N / 25 mm) or more in the longitudinal direction. And the peeling strength of the adhesive agent and undergarment of a slip prevention part will be lower than 4.0 (N / 25mm).
Thereby, it can peel off more reliably, without tearing or tearing the reinforcing film layer of the absorbent article fixed to the underwear.

(Embodiment 1)
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS.
FIG. 1 is a plan view of a sanitary napkin to which the absorbent article of the present invention is applied. 2 is a cross-sectional view taken along line AA ′ of FIG. FIG. 3 is a bottom view of the sanitary napkin of FIG.

  As shown in FIGS. 1 to 3, a sanitary napkin (hereinafter referred to as “napkin”) 1 as an absorbent article includes a top sheet 2 positioned on a surface that comes into contact with the human body when worn, and a side opposite to the top sheet 2. Napkin 1 on the back sheet 3 positioned on the surface that is in contact with the underwear, the absorbent body 4 interposed between the top sheet 2 and the back sheet 3, and the longitudinal side edges of the absorbent body 4. A pair of left and right side seats 5, 5 provided from the front end portion 11a to the rear end portion 11b, and a shift stop portion 6 provided on the underwear contact surface of the back seat 3 are provided.

  The top sheet 2 is formed of a porous or non-porous liquid-permeable nonwoven fabric, a porous plastic sheet, or the like. As the raw material fibers constituting the nonwoven fabric, synthetic fibers such as polyethylene or polypropylene such as olefin, polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used. In addition, as a method for producing the nonwoven fabric, a known method can be appropriately used. For example, the nonwoven fabric is obtained by a spunlace method, a spunbond method, a thermal bond method, a melt blow method, a needle punch method, or a combination of these methods. Can be manufactured. When a large number of through holes are formed in the top sheet 2, body fluids such as menstrual blood and vaginal discharge are absorbed more quickly, and the dry touch properties are excellent.

  The absorbent body 4 functions to absorb water-like components such as urine as a body fluid when the napkin 1 is used, and is highly absorbent with absorbent materials such as cotton and pulp, and sheet-like base materials such as fibers or films. An absorbent core (not shown) formed in combination with a highly water-absorbing resin such as an absorbent polymer is covered with a liquid-permeable crepe paper (not shown). The absorber core may have a single layer structure or may have a structure divided into a plurality of layers.

  The side sheets 5 and 5 are formed of a liquid-impervious non-woven sheet, and have an inner end 51 that extends above the top sheet 2 and an outer end of the napkin 1 that is the other end. It has an outer end 52 to be formed, is adhered to the top sheet 2 in the vicinity of the inner end 51, and is adhered to the back sheet 3 in the vicinity of the outer end 52.

  The side sheets 5 and 5 extend laterally together with the back sheet 3 at the longitudinal center portion and both side edge portions of the napkin 1 to form locking pieces 8 and 8. The locking piece 8 is used to securely fix the napkin 1 when it is attached to the undergarment. Accordingly, the stopper portion 6 is provided on the underwear contact surface of the locking pieces 8, 8.

Here, the back sheet 3 and the misalignment stopper 6 which are the features of the present invention will be described.
The backsheet 3 is composed of two layers: a nonwoven fabric layer 3A made of a nonwoven fabric located on the underwear contact surface side, and a film layer 3B made of a moisture permeable film located between the nonwoven fabric layer 3A and the absorbent body 4. That is, the back sheet 3 is a composite sheet in which a nonwoven fabric and a film having moisture permeability are laminated. In the present invention, a nonwoven fabric having a tear strength of 2940 (mN) or more is used in the tear test according to JIS L1096, and the moisture permeability is 3000 (g / m ^{2) in the} moisture permeability test according to JIS Z0208. -The thing more than 24hr) is used, and the moisture-permeable film and the nonwoven fabric are bonded by, for example, a hot melt adhesive so that the peel strength is 980 (mN / 25 mm) or more.

When the tear strength of the nonwoven fabric is less than 2940 (mN), the strength as a back sheet is not ensured, and tearing may occur at the time of attachment or detachment. In particular, in the case of the napkin 1 having the locking pieces 8, 8, the locking piece 8 portion is pulled out to the outside of the underwear and the base portion is subjected to a large tear stress at the time of mounting. mN) or higher tear strength is required. Accordingly, it is desirable that the tear strength of the nonwoven fabric be 3920 (mN) or more in accordance with this. The tear test is the A-1 method (single tongue method) defined in the same JIS.
In this A-1 method (single tongue method), three test pieces of 10 cm × 25 cm are sampled in the vertical direction and the horizontal direction, and a 10 cm cut is made perpendicular to the central side of the short side, and then the width is measured. Using a tensile tester with a clamp of 5 cm or more, the distance between the grips of the test piece is 10 cm, each tongue piece is sandwiched at right angles to the upper and lower clamps, and at a tensile speed of 10 (cm / min) It measures the maximum load (mN) when tearing in the direction and lateral direction.

  As the non-woven fabric, non-woven fabrics formed from synthetic resin fibers such as olefin fibers such as polyethylene and polypropylene, polyester fibers, nylon fibers, and polyurethane fibers are preferably used, and as a production method thereof, a spunbond method, an air-through method, The method using heat bonding and fiber entanglement such as the point bond method is adopted. Among these, a spunbond nonwoven fabric composed of long fibers is particularly advantageous in that the tear strength is increased.

On the other hand, when the moisture permeability of the film is less than 3000 (g / m ² · 24 hr), sufficient moisture permeability is not ensured in the laminated state with the nonwoven fabric, and stuffiness and fogging may occur. The test conditions for the moisture permeability test according to JIS Z0208 are a temperature of 40 ° C. and a relative humidity of 90%. The moisture-permeable film is preferably a thermoplastic resin, and a material made of polyethylene, polypropylene, ethylene / α-olefin copolymer, ethylene-vinyl acetate copolymer, polyethylene terephthalate, polyamide, polyvinyl chloride, or the like is used. In order to give wettability, as described above, after the filler powder is kneaded into a resin to form a film, the film is perforated by electron beam or embossing to make it porous, and the film is made porous by stretching, and There is a method in which a soluble substance is kneaded with a resin to form a film, and then the soluble substance is eluted to make it porous.

The back sheet 3 naturally has a larger basis weight than the single-layer plastic film, and it is easy to get a feeling of stickiness. Therefore, in order to eliminate the feeling of stickiness at the time of wearing, the basis weight of the film layer 3B is set to 25 (g / m ² ) or less, the basis weight of the nonwoven fabric is set to 20 (g / m ² ) or less, and The total basis weight of the nonwoven fabric and the film is preferably (40 g / m ² ) or less. In this case, in particular, by setting the total basis weight of the nonwoven fabric and the film to 40 (g / m ² ) at the maximum, an absorbent article having a relatively uncomfortable feeling can be obtained.

  Further, the backsheet 3 is required to have water resistance so that the body fluid does not ooze out even when the absorbent body 4 of the napkin 1 absorbs the body fluid. Although the moisture permeability of the moisture permeable film is increased in the present invention, the water resistance test value (low water pressure test-hydrostatic pressure method) according to JIS L1092 is at least 70 (mm) as the water resistance. desirable.

  The non-woven fabric layer 3A and the film layer 3B can be bonded together by heat sealing or embossing, but it is desirable to use a hot melt adhesive to ensure the required strength. Examples of hot melt adhesives include styrene-ethylene-butylene-styrene block copolymers, styrene-butylene-styrene block copolymers, styrene-isobutylene-styrene copolymers, aliphatic aromatic copolymers, and the like. However, among these, in particular, by using the aliphatic aromatic copolymer as a main component and having a low molecular weight oil content reduced, the oil content in the fine pores of the moisture permeable film over time. It is possible to prevent the penetration and decrease in the adhesive force, and a predetermined bonding strength can be ensured.

  Examples of the method for applying the pressure-sensitive adhesive that bonds the nonwoven fabric layer 3A and the film layer 3B include a beat coating method, a slot coating method, a spiral coating method, a curtain spray coating method, and a V slot coating method. Among them, a spiral coating method and a curtain spray coating method that do not inhibit the moisture permeability of the film layer 3B are suitable.

The misalignment preventing portion 6 is formed, for example, by providing an exposed portion 7 that penetrates a part of the nonwoven fabric layer 3A to expose the film layer 3B, and applying an adhesive to the film layer 3B of the exposed portion 7. The
Here, after the film layer 3B is exposed by being in close contact with the nonwoven fabric layer 3A, the adhesive is applied to the film layer 3B. The film layer 3B adheres more strongly to the adhesive than the nonwoven fabric layer 3A. Since the film layer 3B and the adhesive are bonded with sufficient adhesive force by applying an adhesive to the adhesive, the adhesive is surely a film when the napkin 1 is peeled from the underwear after the napkin 1 is used. This is because it follows the layer 3B, and the napkin 1 can be peeled off from the underwear without leaving an adhesive.

  The adhesive is mainly composed of, for example, an acrylic adhesive mainly composed of polyacrylic acid ester, which is generally excellent in durability, and an elastic component and a tackifier of natural rubber and synthetic rubber. It is possible to use a rubber-based adhesive in which a plasticizer, an antiaging agent and the like are blended. As the adhesive, for example, an adhesive mainly comprising any one of a styrene-based polymer, a tackifier, and a plasticizer is preferably used. Examples of the styrenic polymer include styrene-ethylene-butylene-styrene block copolymers, styrene-butylene-styrene block copolymers, and styrene-isobutylene-styrene copolymers. It may be used or two or more polymer blends. Among these, a styrene-ethylene-butylene-styrene block copolymer is preferable in terms of good thermal stability. As the tackifier and plasticizer, those that are solid at room temperature can be preferably used. Examples of the tackifier include C5 petroleum resins, C9 petroleum resins, dicyclopentadiene petroleum resins, and rosin petroleum resins. Polyterpene resin, terpene phenol resin, and the like. Examples of the plasticizer include monomer plasticizers such as trifresil phosphate, dibutyl phthalate and dioctyl phthalate, and polymer plasticizers such as vinyl polymers and polyesters. It is done.

Next, the application pattern of the adhesive applied to the exposed portion 7 in order to form the misalignment preventing portion 6 will be described.
The adhesive may be applied to a part of the film layer 3B of the exposed portion 7, but is preferably applied evenly to the entire surface of the film layer 3B of the exposed portion 7. If there is a region where the adhesive is not applied in the exposed portion 7 (non-adhesive region), when a force for peeling off the napkin 1 is applied, the force is transmitted to the non-adhesive region, and the film layer 3B If the tensile strength is weak, the non-adhesive region is pulled and peeling occurs, and not only the adhesive but also the film layer 3B itself does not follow the napkin 1 and remains on the underwear surface.
By applying an adhesive to the entire film layer 3B in the exposed portion 7, a non-adhesive region is not formed, and therefore, the non-adhesive region of the film layer 3B is pulled and peeled off, and the film layer 3B or The napkin 1 can be peeled off without leaving an adhesive.

Next, the punching pattern of the exposed portion 7 applied to the non-woven fabric layer 3A and the pattern 6 of the shift preventing portion will be described.
An example of the punching pattern applied to the nonwoven fabric layer 3A is shown in FIG. As shown in FIG. 3, along the longitudinal direction of the nonwoven fabric layer 3 </ b> A, a line-shaped exposed portion 7 a is formed at the center in the width direction, and both ends of the exposed portion 7 a, both ends of the nonwoven fabric layer 3 </ b> A in the longitudinal direction. Four exposed portions 7b are provided, two at each portion, and exposed portions 7c and 7c are provided at the locking pieces 8 and 8, respectively.
An adhesive is applied to the film layer 3 </ b> B exposed from each exposed portion 7 provided as described above to form the misalignment preventing portion 6.

The manufacturing method of the slip prevention part 6 of the absorbent article of this invention is demonstrated.
The manufacturing method of the misalignment preventing portion 6 is, for example, piercing the nonwoven fabric layer 3A in accordance with the pattern of the exposed portion 7, applying an adhesive such as hot melt to the nonwoven fabric layer 3A, and adhering to the film layer 3B. An adhesive such as hot melt is used to form the anti-slipping portion 6 by applying an adhesive to the film layer 3B exposed from the exposed portion, or the non-woven fabric layer 3A pierced according to the pattern of the exposed portion 7. It is also possible to use the method of forming the misalignment stopper 6 by adhering to the applied film layer 3B and applying an adhesive to the film layer 3B exposed from the punched-out portion, and is limited to these manufacturing methods. Is not to be done.

As described above, for the sanitary napkin 1 according to the present embodiment described above, the nonwoven fabric layer 3 </ b> A is wound in accordance with the pattern of the shift preventing portion 6 to provide the exposed portion 7, and the film layer exposed from the exposed portion 7. By applying the adhesive to 3B to form the misalignment preventing portion 6, the adhesive is applied to the film layer 3B to which the adhesive strongly adheres compared to the nonwoven fabric layer 3A, and the film layer 3B is bonded. The agent is bonded with sufficient adhesive strength. Therefore, when the napkin 1 is used, the adhesive surely follows the film layer 3B when being peeled off from the underwear, and can be completely peeled off without leaving the adhesive on the underwear surface.
Moreover, while maintaining the function of preventing the leakage of body fluid from the backsheet 3 side by making a non-woven fabric having high air permeability and a two-layer structure made of a liquid-impermeable and moisture-permeable film, The air permeability is increased, and the stuffiness when using the napkin 1 can be eliminated.
Furthermore, since it has a two-layer structure with the nonwoven fabric layer 3A as compared with the case of only the film layer 3B, the strength of the backsheet 3 can be increased.
In addition, by taking a two-layer structure consisting of the nonwoven fabric layer 3A and the film layer 3B, the nonwoven fabric layer 3A will face the outside, and the backsheet 3 will be formed without losing cross-likeness and without impairing the appearance. I can do it.
And by applying an adhesive to the entire exposed portion 7, not only the adhesive but also the film layer 3B itself does not follow the napkin 1, and no non-adhesive region that causes the underwear surface to be formed is formed. The napkin 1 can be peeled off while preventing peeling and leaving the film layer 3B and the adhesive on the underwear surface.
The exposed portion 7 may be formed by exposing the side end portion of the film by using, for example, a non-woven fabric having a smaller area than the film, in addition to the method of forming the non-woven fabric through the non-woven fabric. .

(Embodiment 2)
Next, the napkin 100 according to the second embodiment will be described. The napkin 100 is different from the napkin 1 of the first embodiment in the punching pattern of the exposed portion 7 applied to the nonwoven fabric layer 3A and the pattern 6 of the shift preventing portion. Therefore, in the description of the second embodiment, the same components as those of the first embodiment are denoted by the same reference numerals and the description thereof is omitted.
As shown in FIG. 4, in the napkin 100 according to the second embodiment, the exposed portion 107 is formed in two places 107 a and 107 a and the locking pieces 8 and 8 in the vicinity of both longitudinal sides along the longitudinal direction of the nonwoven fabric layer 3 </ b> A. It is provided in a total of four places, two places 107b and 107b. Further, an adhesive is applied to the film layer 3B exposed not on the entire exposed portion 107 but on the inside thereof, and the exposed portion 107 is exposed, so that the misalignment preventing portion 106 is formed.

The tensile strength of the laminated nonwoven fabric breathable film constituting the back sheet 3 needs to be at least equal to or greater than the peel strength between the adhesive of the misalignment stopper 106 and the undergarment. More specifically, for example, as derived from the results of the adhesive pressure test 2) shown below, the peel strength between the adhesive of the misalignment stopper 106 and the underwear is less than 4.0 (N / 25 mm) Therefore, the tensile strength in the longitudinal direction of the film needs to be 4.0 (N / 25 mm) or more.
Here, the peeling strength between the adhesive and the undergarment of the slip stopper 106 and the tensile strength of the laminated nonwoven fabric breathable film constituting the back sheet 3 will be described.

  The above-mentioned numerical values of peel strength and tensile strength are derived from the results of the adhesive strength test (A) of the adhesive and the tensile strength test (B) of the laminated nonwoven fabric breathable film. Each test will be described below.

The test samples are as follows.
A. Adhesive adhesive strength test 1) Adhesive adhesive strength test before using napkin: JIS L0308 compliant Cotton (Kanakin No. 3) is attached to the napkin so that its misalignment stop 106 is in contact, and 2 kg from the top surface of the napkin 2) Napkin reciprocated with a roller 2) Adhesive strength test of the adhesive after using the napkin: JIS L0308 compliant cotton (Kanakin No. 3) is attached so that the napkin is in contact with 50 (g / cm) ² ) A napkin that was cultivated under a load and 40 ° C. for 24 hours, and was allowed to stand at room temperature for 30 minutes after culturing was used.
B. Tensile strength test of laminated nonwoven fabric breathable film Strength test in the longitudinal (MD) direction of the film: 90 mm in length × 20 mm in width with the direction corresponding to the longitudinal direction of the film taken in the vertical direction and the direction corresponding to the short side taken in the horizontal direction Shaped film The laminated nonwoven fabric breathable film used was a nonwoven fabric with a basis weight of 14 (g / m ² ) made of polypropylene manufactured by a spunbond method and a basis weight of 15 (g / m ² ) made of polyethylene containing a filler. These films are bonded with a hot melt adhesive of 2 (g / m ² ).
Each of the above samples was used as a napkin and as a laminated nonwoven fabric breathable film.

Next, the test method will be described.
A. Adhesive strength test of adhesive: Measured with a Tensilon tensile tester. The measuring method is as follows.
By performing a T-type peel test of the napkin from Kanakin No. 3 at a speed of 300 (mm / min) for both samples prepared assuming use and after use, and recording the peak intensity until complete removal It was measured.
B. Tensile strength test of laminated nonwoven fabric breathable film: Measured with a Tensilon tensile tester. The measuring method is as follows.
Set 20 mm from the vertical upper and lower edges of a rectangular film, which is a sample for measuring the strength in the longitudinal direction, on the chuck of a tensile tester and pull it with a force of 500 mm / min. It was measured by recording the load peak and displacement at the time.
In carrying out this test, 30 (g / m ² ) JM-5219 manufactured by Nippon Fuller Co., Ltd. was used as an adhesive.

  From the adhesive strength test (A) of the adhesive tested by the test method described above, the adhesive strength of the adhesive before using the napkin 100 is 1.0 (N / 25 mm) or more, and the adhesive strength after use is 4. The result was less than 0 (N / 25 mm).

That is, since the adhesive strength of the adhesive after using the napkin 100 is less than 4.0 (N / 25 mm), the tensile strength in the longitudinal direction of the laminated nonwoven fabric breathable film is 4.0 (N / 25 mm).
That's enough.

Then, the result of the tensile strength test (B) of the laminated nonwoven fabric breathable film measured by the above-mentioned test method was confirmed. The results are shown in Table 1.

Here, the longitudinal direction refers to a direction in which the napkin is pulled when peeled off from the underwear.
From the results of Table 1, the load peak in the longitudinal direction of the laminated nonwoven fabric breathable film, that is, the tensile strength, was 7.38 (N / 25 mm) on an average of 5 times. Thereby, it was shown that the tensile strength in the longitudinal direction of the laminated nonwoven fabric breathable film is 7.0 (N / 25 mm) or more.
From the result of the adhesive strength test (A) of the adhesive described above, it is known that the tensile strength in the longitudinal direction is 4.0 (N / 25 mm) or more, but the tensile strength ( From the result of B), it was shown that a generally used napkin has a sufficient tensile strength of 7.0 (N / 25 mm) or more in the longitudinal direction.

  Therefore, in the second embodiment, even if the non-adhesive region of the film is formed without applying the adhesive to the entire exposed portion 107, the tensile strength in the longitudinal direction of the film is 4.0 (N / 25 mm) or more. Yes, since the adhesive strength after use of the adhesive applied to the film surface is less than 4.0 (N / 25 mm), the strength that does not exceed the tensile strength limit value of the napkin 100 after using the napkin 100 Therefore, the film can be peeled off without tearing or tearing.

  In the napkin 100 according to the second embodiment, not only the same effect as in the first embodiment is obtained, but also the tensile strength in the longitudinal direction of the film is 4.0 (N / 25 mm) or more, and the film is applied to the film surface. The adhesive strength before use of the napkin 100 is 1.0 (N / 25 mm) or more, and the adhesive strength between the adhesive and the underwear after use is less than 4.0 (N / 25 mm). The napkin 100 can be securely fixed to the underwear before, and the napkin 100 can be reliably removed from the underwear after use without tearing or tearing the film or generating adhesive residue. Become.

In addition, although Embodiment 2 was mentioned as a method of forming the slip stopper 106 without applying an adhesive to the entire exposed portion 107, for example, the slip stopper is formed by applying an adhesive to a more limited range. It doesn't matter. Specifically, for example, like the napkin 200 shown in FIG. 5, the exposed portion 207 is arranged at two locations 207 a and 207 a near the both side portions along the longitudinal direction of the nonwoven fabric layer 3 </ b> A, and the locking pieces 8 and 8. In two places 207b and 207b in total, that is, in the same position as in the second embodiment, with the same shape, not on the entire surface of the film layer 3B exposed at the exposed portion 207 but on a part inside thereof Alternatively, the adhesive may be applied only to form a total of six misalignment stop portions 206.
Or, for example, like the napkin 300 shown in FIG. 6, the exposed portion 307 extends along the longitudinal direction of the nonwoven fabric layer 3 </ b> A, takes a width at the longitudinal central portion, and is located at one location 307 a and the locking pieces 8 and 8. 307b, 307b, a total of three locations, not the entire surface of the film layer 3B exposed to the exposed portion 307, but the longitudinal central portion of the exposed portion 307a and its both sides and the exposed portions 307b, 307b on the locking pieces 8, 8 The shift stoppers 306 may be formed at a total of five locations.
In these napkins 200 and 300 which are modifications of the second embodiment, the same effects as those of the second embodiment can be obtained.

(Embodiment 3)
Next, the napkin 400 which concerns on Embodiment 3 is demonstrated using FIGS. The napkin 400 differs from the first embodiment in that a reinforcing film layer is disposed on the back sheet and the underwear contact surface of the back sheet. Therefore, in describing the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
FIG. 7 is a plan view of the sanitary napkin of Embodiment 3 to which the absorbent article of the present invention is applied. 8 is a cross-sectional view taken along line BB ′ of FIG. 7, and FIG. 9 is a bottom view of the sanitary napkin of FIG.

As shown in FIGS. 7 to 9, the napkin 400 includes a top sheet 2 positioned on the surface that contacts the human body when worn, and a back sheet positioned on the surface opposite to the top sheet 2 and in contact with the underwear. 30, the absorbent body 4 interposed between the top sheet 2 and the back sheet 30, and a pair of left and right provided at the longitudinal side edges of the absorbent body 4 from the front end portion 11 a to the rear end portion 11 b of the napkin 1. Side seats 5 and 5, and a misalignment stopping portion 406 provided on the underwear contact surface of the back sheet 30.
The top sheet 2, the absorbent body 4, and the side sheet 5 are the same as those in the first embodiment.

The back sheet 30 is composed of two layers, a nonwoven fabric layer 30 </ b> A located on the underwear contact surface side, and a moisture permeable film layer 30 </ b> B located between the nonwoven fabric layer 30 </ b> A and the absorbent body 4. That is, the back sheet 30 is a composite sheet in which a nonwoven fabric and a film having moisture permeability are laminated.
As the nonwoven fabric used for the nonwoven fabric layer 30A, nonwoven fabrics formed from synthetic resin fibers such as olefinic fibers such as polyethylene and polypropylene, polyester fibers, nylon fibers, polyurethane fibers are preferably used. A method using heat fusion and fiber entanglement such as a method, an air-through method, and a point bond method is employed. Among these, a spunbond nonwoven fabric composed of long fibers is particularly advantageous in that the tear strength is increased.

  The film used for the film layer 30B is preferably a thermoplastic resin and is made of polyethylene, polypropylene, ethylene / α-olefin copolymer, ethylene-vinyl acetate copolymer, polyethylene terephthalate, polyamide, polyvinyl chloride, or the like. In order to give moisture permeability, in addition to the method of kneading the filler powder into a resin to make a film, and then making the film porous by stretching, the film is perforated by electron beam or embossing and made porous, and There is a method in which a soluble substance is kneaded with a resin to form a film, and then the soluble substance is eluted to make it porous.

  The non-woven fabric layer 30A and the film layer 30B can be bonded together by heat sealing or embossing, but it is desirable to use a hot melt adhesive to ensure the required strength. Examples of hot melt adhesives include styrene-ethylene-butylene-styrene block copolymers, styrene-butylene-styrene block copolymers, styrene-isobutylene-styrene copolymers, aliphatic aromatic copolymers, and the like. However, among these, in particular, by using the aliphatic aromatic copolymer as a main component and having a low molecular weight oil content reduced, the oil content in the fine pores of the moisture permeable film over time. It is possible to prevent the penetration and decrease in the adhesive force, and a predetermined bonding strength can be ensured.

  Examples of the method for applying the pressure-sensitive adhesive that bonds the nonwoven fabric layer 30A and the film layer 30B include a beat coating method, a slot coating method, a spiral coating method, a curtain spray coating method, and a V slot coating method. Among them, a spiral coating method and a curtain spray coating method that do not inhibit the moisture permeability of the film layer 30B are suitable.

The reinforcing film layer 9 is disposed on the underwear contact surface of the nonwoven fabric layer 30A.
As an arrangement pattern of the reinforcing film layer 9, for example, as shown in FIG. 9, a line-shaped reinforcing film layer 9a is arranged at the center in the width direction along the longitudinal direction of the nonwoven fabric layer 30A. A total of four reinforcing film layers 9b are arranged on both side portions of the film layer 9a at two ends in the longitudinal direction of the nonwoven fabric layer 30A, and a total of four reinforcing film layers 9b are provided on the locking pieces 8 and 8, respectively. 9c.
An adhesive is applied to each of the reinforcing film layers 9 arranged as described above to form the misalignment preventing portion 406.

  By providing the reinforcing film layer 9 on the underwear contact surface of the nonwoven fabric layer 30A, and applying an adhesive to the reinforcing film layer 9 to form the misalignment preventing portion 406, the adhesive can be compared with the nonwoven fabric. Since the adhesive is applied to the strongly adhering film and the film and the adhesive are bonded with sufficient adhesive strength, the adhesive is surely removed when the napkin 400 is peeled from the underwear after the napkin 400 is used. Therefore, the napkin can be peeled off from the underwear without leaving an adhesive.

As a film used for the reinforcing film layer 9, the film provided for the film layer 30B described above can be used.
In the present embodiment, the adhesive film is applied to the entire surface of the reinforcing film layer 9 to form the misalignment preventing portion 406, but as a means for fixing the reinforcing film layer 9 on the underwear contact surface of the nonwoven fabric layer 30A, Any known method can be used, and when the napkin is used, it is preferable that the reinforcing film layer 9 and the nonwoven fabric layer 30A are firmly fixed to each other when they are peeled from the shorts. Moreover, a well-known adhesive agent can be used as an adhesive agent for adhering the reinforcing film layer 9 to the nonwoven fabric layer 30A. Further, from the viewpoint of easy processing, adhesion by hot melt or adhesion by heat sealing is preferable.

Here, the film tensile strength of the back sheet 30 is 4.0 (N / 25 mm) or more, the basis weight is 25 (g / m ² ) or less, and the basis weight of the nonwoven fabric is 20 (g / m ² ) or less. It needs to be. This is derived from the test results shown below. Hereinafter, the water pressure resistance, the tensile strength, and the basis weight of the back sheet 30 will be described.

The test samples are as follows.
A non-woven fabric with a basis weight of 14 (g / m ² ) made of polypropylene manufactured by a spunbond method and a film with a basis weight of 15 (g / m ² ) made of polyethylene containing a filler is hot at 2 (g / m ² ). A laminated nonwoven fabric breathable film formed by bonding with a melt adhesive was used.

The test method is as follows.
The above-mentioned basis weight of the laminated nonwoven fabric breathable film is changed at an appropriate interval from 10 (g / m ² ) to 30 (g / m ² ), and the water pressure resistance, softness, seepage and tensile strength at each basis weight are changed. It was measured. Each test method is as follows.
Water pressure resistance: Measured according to JIS L1092 water pressure resistance test value (low water pressure test-hydrostatic pressure method).
Softness: An evaluation examiner actually put on a napkin, and sensorially evaluated whether or not there was a sense of incongruity at the time of wearing.
Exudation: Place a pulp with a basis weight of 300 (g / m ² ) on the back sheet, absorb 1.0 (cc) of artificial blood into the pulp, and then apply a load of 5 (g / cm ² ) to the pulp After 3 hours, the seepage from the back sheet side was visually confirmed.
Tensile strength: measured with a Tensilon tensile strength tester. Set 20 mm from the vertical upper and lower edges of the rectangular laminated nonwoven fabric breathable film on the chuck of the tensile tester, pull it with a force of 500 mm / min, and when the film breaks It was measured by recording the load peak and displacement.
Table 2 shows the results of the basis weight, water pressure resistance, softness, seepage, and tensile strength of the backsheet using the laminated nonwoven fabric breathable film subjected to the test.

The evaluation method is as follows.
The evaluation of softness was performed in three stages: ◎: very good, ◯: good, ×: bad, and the results are shown in Table 2.
The evaluation of the exudation was carried out in two steps: ○: no exudation, x: exudation, and the results are shown in Table 2.

As shown in the adhesive strength test of the adhesive of Embodiment 1, the adhesive strength of the adhesive after using the napkin is less than 4.0 (N / 25 mm), so that the tensile strength in the longitudinal direction of the laminated nonwoven fabric breathable film is A strength of 4.0 (N / 25 mm) or more is sufficient, that is, a tensile strength of the film layer of 4.0 (N / 25 mm) or more is sufficient.
Moreover, the result of the test by the above-described test method showed that the softness was lost when the basis weight of the film layer exceeded 25 (g / m ² ). At the same time, if the basis weight of the entire back sheet exceeds 40 (g / m ² ), the softness is lost.

Therefore, the tensile strength of the film layer of the back sheet is 4.0 (N / 25 mm) or more, the basis weight is 25 (g / m ² ) or less, and the basis weight of the entire back sheet is 40 (g / m ^2). )

  In the napkin 400 according to the third embodiment, not only the same effects as those of the first embodiment can be obtained, but also the nonwoven fabric layer 30A or the film layer 30B constituting the backsheet 30 itself is not subjected to processing, and is newly added for reinforcement. Only by disposing the film layer 9 on the underwear contact surface of the back sheet, it is possible to provide the misalignment prevention portion 406, and it is possible to easily provide an appropriate misalignment prevention portion.

(Embodiment 4)
Next, the napkin 500 which concerns on Embodiment 4 is demonstrated using FIGS. The napkin 500 is different from the third embodiment in the reinforcing film layer disposed on the underwear contact surface of the back sheet and the slip stopper provided on the reinforcing film layer. Therefore, in the description of the fourth embodiment, the same components as those of the third embodiment are denoted by the same reference numerals and the description thereof is omitted.
FIG. 10 is a plan view of the sanitary napkin of Embodiment 4 to which the absorbent article of the present invention is applied. 11 is a cross-sectional view taken along the line CC ′ of FIG. 10, and FIG. 12 is a bottom view of the sanitary napkin of FIG.

As shown in FIGS. 10 to 12, the napkin 500 includes a top sheet 2 positioned on the surface that contacts the human body when worn, and a back sheet positioned on the surface opposite to the top sheet 2 and in contact with the underwear. 30, the absorbent body 4 interposed between the top sheet 2 and the back sheet 30, and a pair of left and right provided at the longitudinal side edges of the absorbent body 4 from the front end portion 11 a to the rear end portion 11 b of the napkin 1. Side seats 5 and 5, and a shift stopper 506 provided on the underwear contact surface of the back sheet 30.
The top sheet 2, the absorbent body 4, and the side sheet 5 are the same as those in the first embodiment. The back sheet 30 is the same as that in the third embodiment.

Here, the reinforcing film layer 10 and the shift stopper 506 will be described.
The reinforcing film layer 10 is disposed on the underwear contact surface of the nonwoven fabric layer 30A.
As an arrangement pattern of the reinforcing film layer 10, for example, as shown in FIG. 12, two reinforcing film layers 10 a, 10 a and locking pieces 8 are provided in the vicinity of both longitudinal sides along the longitudinal direction of the nonwoven fabric layer 30 </ b> A. , 8 were provided with two reinforcing film layers 10b and 10b.
An adhesive agent was applied to the reinforcing film layer 10 arranged as described above not on the entire surface but on the inner side portion to form a misalignment preventing portion 506.

  By providing the reinforcing film layer 10 on the underwear contact surface of the nonwoven fabric layer 30A, and applying an adhesive to the reinforcing film layer 10 to form the misalignment stopper 506, the adhesive can be compared with the nonwoven fabric. Since the adhesive is applied to the strongly adhering film and the film and the adhesive are bonded with sufficient adhesive strength, the adhesive is surely removed when the napkin 500 is peeled from the underwear after the napkin 500 is used. Therefore, the napkin can be peeled off from the underwear without leaving an adhesive.

As a means for fixing the reinforcing film layer 10 on the underwear contact surface of the nonwoven fabric layer 30A, any known method can be used. When the napkin is used and then peeled off the shorts, The non-woven fabric layer 30A is preferably fixed to the extent that it does not peel off. Moreover, a well-known adhesive agent can be used as an adhesive agent for adhering the reinforcing film layer 10 to the nonwoven fabric layer 30A. Further, from the viewpoint of easy processing, adhesion by hot melt or adhesion by heat sealing is preferable.
Here, the tensile strength of the reinforcing film layer 10 needs to be at least equal to or greater than the peel strength between the adhesive of the misalignment stopper 506 and the undergarment. More specifically, for example, as derived from the results of the adhesive pressure test 2) shown below, the peel strength between the adhesive of the misalignment stopper 506 and the underwear is less than 4.0 (N / 25 mm). Therefore, the tensile strength in the longitudinal direction of the reinforcing film layer needs to be 4.0 (N / 25 mm) or more.
Here, the peel strength between the adhesive and the underwear of the misalignment stopper 506 and the tensile strength of the reinforcing film layer 10 will be described.

  The above-mentioned numerical values of peel strength and tensile strength are derived from the results of the adhesive strength test (A) of the adhesive and the tensile strength test (B) of the reinforcing film. Below, each test is demonstrated.

The test samples are as follows.
A. Adhesive adhesive strength test 1) Adhesive adhesive strength test before using napkin: JIS L0308 compliant Cotton (Kanakin No. 3) is attached with a napkin so that its misalignment stop 506 is in contact, and 2 kg from the top surface of the napkin Napkin reciprocated with a roller 2) Adhesive strength test of adhesive after use of napkin: JIS L0308 compliant cotton (Kanakin No. 3) is attached so that the napkin is in contact with the displacement stopper 506, 50 (g / cm ² ) A napkin that was cultivated under a load at 40 ° C. for 24 hours and left at room temperature for 30 minutes after the culturing was used.
B. Tensile strength test of reinforcing film Strength test in the longitudinal (MD) direction of the film: a rectangular shape measuring 90 mm in length and 20 mm in width with the direction corresponding to the longitudinal direction of the film taken in the vertical direction and the direction corresponding to the short direction taken in the horizontal direction Film The reinforcing film used was a film made of polyethylene containing a filler. Each of the above samples was used as a napkin and a reinforcing film.

Next, the test method will be described.
A. Adhesive strength test of adhesive: Measured with a Tensilon tensile tester. The measuring method is as follows.
By performing a T-type peel test of the napkin from Kanakin No. 3 at a speed of 300 (mm / min) on both samples prepared assuming use and after use, and recording the peak speed until complete removal It was measured.
B. Tensile strength test of reinforcing film: Measured with a Tensilon tensile tester. The measuring method is as follows.
The longitudinal upper and lower edges 20 mm of a rectangular film as a sample for measuring the strength in the longitudinal direction were set on a chuck of a tensile tester, pulled with a force of 500 (mm / min), and the film was cut. It was measured by recording the load peak and displacement at the time.
In carrying out this test, 30 (g / cm ² ) JM-5219 manufactured by Nippon Fuller Co., Ltd. was used as an adhesive.

  From the adhesive strength test (A) of the adhesive tested by the test method described above, the adhesive strength before use of the napkin 500 is 4.0 (N / 25 mm) or more, and the adhesive strength after use is 4. A result of less than 0 (N / 25 mm) was obtained.

  That is, since the adhesive strength of the adhesive after using the napkin 500 is less than 4.0 (N / 25 mm), it is sufficient that the tensile strength in the longitudinal direction of the reinforcing film is 4.0 (N / 25 mm) or more. Become.

Then, the result of the tensile strength test (B) of the reinforcing film measured by the above test method was confirmed. The results are shown in Table 3.

Here, the longitudinal direction refers to a direction in which the napkin is pulled when peeled off from the underwear.
From the results of Table 3, the load peak in the longitudinal direction of the reinforcing film, that is, the tensile strength was 6.69 (N / 25 mm) on an average of 5 times. Thereby, it was shown that the tensile strength in the longitudinal direction of the reinforcing film is 6.1 (N / 25 mm) or more.
From the results of the adhesive strength test (A) described above, it is known that the tensile strength in the longitudinal direction is 4.0 (N / 25 mm) or more, but the tensile test (B From the results of), it was shown that a commonly used napkin has a sufficient tensile strength of 6.1 (N / 25 mm) in the longitudinal direction.

  In the napkin 500 according to the fourth embodiment, not only the same effect as in the third embodiment is obtained, but also the tensile strength in the longitudinal direction of the reinforcing film is 6.1 (N / 25 mm) or more, The adhesive strength of the adhesive applied to the film surface is 4.0 (N / 25 mm) or more before use, and the adhesive strength between the adhesive and the underwear after use is less than 4.0 (N / 25 mm). Therefore, the napkin 500 can be securely fixed to the underwear before use, and after use, the napkin 500 can be reliably secured without tearing or tearing the reinforcing film layer or generating adhesive residue. It becomes possible to remove it from underwear.

In addition, although Embodiment 4 was mentioned as a method of forming the slip stopper 506 without applying an adhesive on the entire surface of the reinforcing film layer 10, for example, the slip stopper by applying adhesive to a more limited range. May be formed. Specifically, for example, like the napkin 600 shown in FIG. 13, the reinforcing film layer 12 is placed in two locations 12 a and 12 a engaging pieces 8 and 8 in the vicinity of both longitudinal sides along the longitudinal direction of the nonwoven fabric layer 30 </ b> A. After arranging the same shape at two positions 12b and 12b, that is, at the same positions as in the fourth embodiment, an adhesive is applied only to a part of the reinforcing film layer 12 instead of the entire surface. A misalignment stop portion 607 may be formed.
Alternatively, for example, like the napkin 700 shown in FIG. 14, the reinforcing film layer 13 is formed in a single portion 13 a and two locking pieces 8, 8 with a width at the longitudinal center along the longitudinal direction of the nonwoven fabric layer 30 </ b> A. A total of three locations 13b and 13b are arranged, and not on the entire surface of the reinforcing film layer 13, but on the reinforcing film layers 13b and 13b provided on the longitudinal central portion of the reinforcing film layer 13a and both sides thereof and the locking pieces. You may form the shift stop part 707 in five places.
In these napkins 600 and 700 which are modifications of the fourth embodiment, the same effects as in the fourth embodiment can be obtained.

(Embodiment 5)
Next, the napkin 800 according to the fifth embodiment will be described with reference to FIGS. The napkin 800 is different from the third embodiment in the back sheet. Therefore, in describing the fifth embodiment, the same components as those of the third embodiment are denoted by the same reference numerals, and the description thereof is omitted.
FIG. 15 is a plan view of a sanitary napkin according to a fifth embodiment to which the absorbent article of the present invention is applied. 16 is a cross-sectional view taken along the line DD ′ of FIG. 15, and FIG. 17 is a bottom view of the sanitary napkin of FIG.

As shown in FIGS. 15 to 17, the napkin 800 includes a top sheet 2 positioned on a surface that contacts the human body when worn, and a back sheet positioned on the surface opposite to the top sheet 2 and in contact with the underwear. 40, an absorbent body 4 interposed between the top sheet 2 and the back sheet 40, and a pair of left and right provided at the longitudinal both side edges of the absorbent body 4 from the front end portion 11a to the rear end portion 11b of the napkin 1. Side seats 5 and 5, and a shift stopper 806 provided on the underwear contact surface of the back sheet 40.
The top sheet 2, the absorbent body 4, and the side sheet 5 are the same as those in the first embodiment.

  The back sheet 40 is made of a nonwoven fabric layer. As the nonwoven fabric used for the backsheet 40, nonwoven fabrics formed from synthetic resin fibers such as olefinic fibers such as polyethylene and polypropylene, polyester fibers, nylon fibers, polyurethane fibers are preferably used. A method using heat fusion and fiber entanglement such as a method, an air-through method, and a point bond method is employed. Among these, a spunbond nonwoven fabric composed of long fibers is particularly advantageous in that the tear strength is increased.

The reinforcing film layer 14 is disposed on the underwear contact surface of the back sheet 40.
For example, as shown in FIG. 17, the reinforcing film layer 14 is arranged such that a line-shaped reinforcing film layer 14 a is arranged at the center in the width direction along the longitudinal direction of the back sheet 40. A total of four reinforcing film layers 14b are arranged on both side portions of the layer 14a at two longitudinal ends of the back sheet 40, and the reinforcing film layers 14c are respectively provided on the locking pieces 8, 8. 14c.
An adhesive is applied to each reinforcing film layer 14 arranged as described above to form a misalignment stop 806.

  By providing the reinforcing film layer 14 on the underwear contact surface of the back sheet 40 and applying an adhesive to the reinforcing film layer 14 to form a misalignment stopper 806, the adhesive can be compared with a nonwoven fabric. Since the adhesive is applied to the film that adheres strongly, and the film and the adhesive are bonded with sufficient adhesive force, the adhesive is surely removed when the napkin 800 is peeled from the underwear after the napkin 800 is used. Therefore, the napkin can be peeled off from the underwear without leaving an adhesive.

The film used for the reinforcing film layer 14 is preferably a thermoplastic resin, and is made of polyethylene, polypropylene, ethylene / α-olefin copolymer, ethylene-vinyl acetate copolymer, polyethylene terephthalate, polyamide, polyvinyl chloride, or the like. The material is used, and in order to give moisture permeability, after the filler powder is kneaded into a resin to form a film, in addition to the method of making the film porous by stretching treatment, the film is perforated by electron beam or embossing to make it porous, In addition, there is a method in which a soluble substance is kneaded with a resin to form a film, and then the soluble substance is eluted to make it porous.
In this embodiment, the adhesive stopper 806 is formed on the entire surface of the reinforcing film layer 14 by applying a solid adhesive.

Here, the water pressure resistance of the back sheet 40 is 70 (mm) or more, and the basis weight is 200 (g / m ² ) or less. This is derived from the test results shown below. The water pressure resistance and basis weight of the back sheet 40 will be described below.

The test samples are as follows.
A nonwoven fabric called SMMS nonwoven fabric composed of 4 layers was used, which was made by laminating two nonwoven fabrics manufactured by the melt blow method, sandwiched by the nonwoven fabric manufactured by the spunbond method, and pressed at high pressure.

The test method is as follows.
The weight per unit area of the nonwoven fabric was changed from 13 (g / m ² ) to 300 (g / m ² ) at appropriate intervals, and the water pressure resistance, softness, and oozing at each basis weight were measured. Each test method is as follows.
Water pressure resistance: Measured according to JIS L1092 water pressure resistance test value (low water pressure test-hydrostatic pressure method).
Softness: An evaluation examiner actually put on a napkin, and sensory-evaluated whether or not there was a sense of incongruity at the time of wearing.
Exudation: Place a pulp with a basis weight of 300 (g / m ² ) on the back sheet, absorb 1.0 (cc) of artificial blood into the pulp, and then apply a load of 5 (g / cm ² ) to the pulp After 3 hours, the seepage from the back sheet side was visually confirmed.
Table 4 shows the basis weight, water pressure resistance, softness and exudation results of the backsheet using the nonwoven fabric subjected to the test.

The evaluation method is as follows.
The evaluation of softness was performed in three stages: ◎: very good, ◯: good, ×: bad. The results are shown in Table 4.
The evaluation of the exudation was carried out in two stages: ○: no exudation, x: exudation, and the results are shown in Table 4.

From the result of the test by the test method described above, it can be seen that leakage occurs when the water pressure resistance is less than 70 (mm). It can also be seen that the softness is lost when the basis weight exceeds 200 (g / m ² ).

Accordingly, the water pressure resistance of the backsheet 40 is preferably 70 (mm) or more and the basis weight is preferably 200 (g / m ² ) or less, more preferably the basis weight is 30 (g / m ² ) or more and 60. (G / m ² ) or less.

  In the napkin 800 according to the fifth embodiment, not only the same effects as those of the third embodiment can be obtained, but the backsheet 40 can be formed of only a non-woven fabric to have a single-layer structure. It can be made thin and soft.

  In addition, as a method for forming the misalignment-preventing portion without applying the adhesive to the entire surface of the reinforcing film layer 14 to form the misalignment-preventing portion 806, the method described in the fourth and fourth modifications of the fourth and fourth embodiments is given. Such a coating method may be used.

It is a top view of the sanitary napkin of Embodiment 1 to which the absorbent article of this invention is applied. It is sectional drawing in the AA 'line of FIG. It is a bottom view of the sanitary napkin of FIG. It is a top view of the sanitary napkin of Embodiment 2 to which the absorbent article of this invention is applied. FIG. 10 is a bottom view of a sanitary napkin according to Modification 1 of Embodiment 2. It is a bottom view of the sanitary napkin of the modification 2 in Embodiment 2. It is a top view of the sanitary napkin of Embodiment 3 to which the absorbent article of this invention is applied. It is sectional drawing in the BB 'line | wire of FIG. It is a bottom view of the sanitary napkin of FIG. It is a bottom view of the sanitary napkin of Embodiment 4 to which the absorptive article of the present invention is applied. It is sectional drawing in the CC 'line of FIG. It is a bottom view of the sanitary napkin of FIG. It is a bottom view of the sanitary napkin of the modification 1 in Embodiment 4. It is a bottom view of the sanitary napkin of the modification 2 in Embodiment 4. It is a top view of the sanitary napkin of Embodiment 5 to which the absorbent article of this invention is applied. It is sectional drawing in the DD 'line of FIG. It is a bottom view of the sanitary napkin of FIG.

Explanation of symbols

1, 100, 200, 300, 400, 500, 600, 700, 800 Sanitary napkin 2 Top sheet 3, 30, 40 Back sheet 3A, 30A Non-woven fabric layer 3B, 30B Film layer 4 Absorber 5 Side sheet 6, 106, 206, 306, 406, 506, 606, 706, 806 Displacement stop 7, 107, 207, 307 Exposed 8 Lock piece 9, 10, 12, 13, 14 Reinforcing film layer

Claims (12)

A top sheet positioned on a surface that contacts the human body, a back sheet positioned on a surface opposite to the top sheet and in contact with underwear, and interposed between the top sheet and the back sheet. In an absorbent article comprising: an absorbent body, and a slip stopper provided on an underwear contact surface of the back sheet, to which an adhesive is applied,
The backsheet consists of two layers, a nonwoven fabric layer located on the underwear side, and a film layer located on the absorber side,
The absorptive part is formed in an exposed part where the film layer is exposed from the nonwoven fabric layer.   The absorbent article according to claim 1, wherein the exposed portion is formed by the non-woven fabric layer being penetrated.   The absorbent article according to claim 1 or 2, wherein an adhesive is applied to the entire surface of the exposed portion where the misalignment stop portion is formed.   The absorbent article according to any one of claims 1 to 3, wherein the tensile strength of the film layer is at least equal to or greater than the peel strength between the adhesive and the undergarment of the slip stopper.   The tensile strength of the film layer is 4.0 (N / 25 mm) or more in the longitudinal direction, and the peel strength between the adhesive and the underwear of the misalignment stopper is lower than 4.0 (N / 25 mm) The absorptive article according to claim 4 characterized by things. A top sheet positioned on a surface that contacts the human body, a back sheet positioned on a surface opposite to the top sheet and in contact with underwear, and interposed between the top sheet and the back sheet. In an absorbent article comprising: an absorbent body, and a slip stopper provided on an underwear contact surface of the back sheet, to which an adhesive is applied,
The backsheet consists of a film layer located on the absorber side and a nonwoven fabric layer located on the underwear side,
An absorptivity characterized in that a reinforcing film layer having a size that is at least equal to or greater than that of the misalignment stopper and smaller than the nonwoven fabric layer is disposed between the misalignment stopper and the nonwoven fabric layer. Goods. The tensile strength of the film layer of the back sheet is 4.0 (N / 25 mm) or more and the basis weight is 25 (g / m ² ) or less, and the basis weight of the entire back sheet is 40 (g / m ^2). The absorbent article according to claim 6, wherein: A top sheet positioned on a surface that contacts the human body, a back sheet positioned on a surface opposite to the top sheet and in contact with underwear, and interposed between the top sheet and the back sheet. In an absorbent article comprising: an absorbent body, and a slip stopper provided on an underwear contact surface of the back sheet, to which an adhesive is applied,
The back sheet is composed of a nonwoven fabric layer,
An absorptivity characterized in that a reinforcing film layer having a size that is at least equal to or greater than that of the misalignment stopper and smaller than the nonwoven fabric layer is disposed between the misalignment stopper and the nonwoven fabric layer. Goods. The absorbent article according to claim 8, wherein the water pressure resistance of the back sheet is 70 (mm) or more and the basis weight is 200 (g / m ² ) or less.   The absorbent article according to any one of claims 6 to 9, wherein the reinforcing film layer has substantially the same shape and size as the misalignment stopper.   The absorbent article according to any one of claims 6 to 10, wherein a tensile strength of the reinforcing film layer is at least equal to or greater than a peel strength between an adhesive and an undergarment of the slip stopper.   The tensile strength of the reinforcing film layer is 4.0 (N / 25 mm) or more in the longitudinal direction, and the peel strength between the adhesive and the undergarment of the slip stopper is 4.0 (N / 25 mm) The absorbent article according to claim 11, wherein the absorbent article is also low.

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