JP3871611B2 - Absorbent articles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention prevents twisting of the rear flap while suppressing a decrease in productivity and an increase in manufacturing cost, can prevent troubles during wearing and uncomfortable feeling during wearing, and further forms an adhesive layer for fixing the rear flap. The present invention relates to an absorbent article having excellent transferability of adhesive.
[0002]
[Prior art and problems to be solved by the invention]
Conventionally, as a sanitary napkin, it has a liquid-permeable surface layer, a liquid-impermeable back layer, and a liquid-retaining absorbent layer interposed between these two layers, and when worn, it is positioned close to the wearer's back. One having rear flaps on both sides of the rearward longitudinal portion is known. Such a rear flap prevents the occurrence of so-called back leakage, in which menstrual blood or the like moves to the back side from the liquid excretion portion and leaks during wearing.
However, since the rear flap in the conventional napkin has low rigidity and is likely to be twisted, when fixing to clothing such as shorts, the flap fixing adhesive layer provided on the flap adheres to the other part of the flap, It may take time to remove it, and in some cases it may be impossible to use.
In addition, if the rear flap is worn in a twisted state, or the flap may be twisted due to the movement of the body while wearing, in such a case, you feel uncomfortable, the feeling of wearing gets worse, In some cases, leakage may be induced.
[0003]
Japanese Utility Model Registration No. 2553363 discloses a sanitary napkin having wing portions on both sides of a crotch portion, and the wing portion is provided with a reinforcing layer to increase its rigidity and prevent twisting of the wing portion. A sanitary napkin is described. However, since the reinforcing layer is formed by disposing a highly rigid sheet, the productivity deteriorates and the manufacturing cost increases due to an increase in the number of members constituting the napkin.
[0004]
Accordingly, an object of the present invention is to prevent the rear flap from twisting while suppressing a decrease in productivity and an increase in manufacturing cost, and can prevent trouble during wearing and a sense of incongruity during wearing, and further, an adhesive for fixing the rear flap. It is in providing the absorbent article excellent in the transferability of the adhesive at the time of forming a layer.
[0005]
[Means for Solving the Problems]
The present invention comprises a liquid-permeable surface layer, a liquid-impermeable back layer, and a liquid-retaining absorbent layer interposed between the two layers, and is disposed at a position close to the wearer's back when worn. In an absorbent article provided with a rear flap that is adhesively fixed on the inner surface of a garment such as shorts when worn on both sides of the part, the rear flap includes a liquid-impermeable sheet and the skin of the liquid-impermeable sheet The nonwoven fabric laminated on the abutting surface side, and the rear flap is formed with an uneven pattern on the nonwoven fabric by hot embossing to enhance the rigidity, and the liquid-impermeable sheet clothing of the rear flap An adhesive layer for fixing the rear flap is formed on the abutting surface side, the liquid-impermeable sheet is made of a resin film, and the nonwoven fabric contains the same resin as the constituent resin of the resin film in a sheath. Made of core-sheath type composite fiber The concavo-convex pattern is formed by applying the hot embossing to a laminate in which the liquid-impermeable sheet and the nonwoven fabric are laminated, and the surface of the rear flap on the liquid-impermeable sheet side is also concavo-convex. The above object is achieved by providing an absorbent article in which a pattern is formed .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on preferred embodiments thereof.
As shown in FIGS. 1 and 2, a sanitary napkin 1 according to an embodiment of the present invention includes a surface sheet 2 as a liquid-permeable surface layer, a back sheet 3 as a liquid-impermeable back layer, and these. The absorbent body 4 is provided as a liquid-retaining absorbent layer interposed between the two layers, and is formed substantially vertically long.
The sanitary napkin 1 is disposed so as to face the front portion A disposed at a position closer to the wearer's ventral side during wear and the wearer's liquid drainage portion in order from one end portion to the other end portion in the longitudinal direction. It has a crotch part B and a rear part C arranged at a position closer to the wearer's back side.
[0007]
The top sheet 2 and the back sheet 3 that cover the absorbent body 4 and both surfaces thereof (skin contact surface and non-skin contact surface) are laminated as shown in FIG. 2, and the napkin is disposed at the center in the width direction of the napkin 1. A main body portion 10 extending in the longitudinal direction is formed.
The sanitary napkin 1 according to the present embodiment extends from both side edges in the longitudinal direction of the main body portion 10 to both side portions of the rear portion C, and is a rear flap that is adhesively fixed onto the inner surface of clothing such as shorts when worn. 5 is provided.
[0008]
As shown in FIG. 2, the back sheet 3 in the rear part C has extended portions 31, 31 extending outward in the width direction from both side edges 41, 41 in the longitudinal direction of the absorbent body 4. A nonwoven fabric 51 for forming a flap is laminated on the skin contact surface side of each extending portion 31.
The rear flap 5 in the sanitary napkin 1 of the present embodiment is thus composed of a laminate of the extended portion (liquid permeable sheet) 31 of the back sheet 3 and the nonwoven fabric 51 for forming the flap. As for the nonwoven fabric 51, the one side edge 51a near the width direction center line L (refer FIG. 1) of the napkin 1 is being fixed between the both sides of the absorber 4, and the back surface sheet 3, and this one side edge Edge portions 51 b except 51 a are joined to the back sheet 3 (extending portion 31) at the peripheral edge portion of the napkin 1 to form the peripheral seal portion 8. In addition, the embossing said by this invention does not include this embossing in case embossing is given only to the peripheral part (51b) of a napkin. The skin contact surface of the absorber 4 and the extension part (liquid impermeable sheet) 31 refers to a surface directed toward the wearer's skin when worn.
[0009]
The rear flap 5 is formed with an uneven pattern on the nonwoven fabric 51 by embossing to increase the rigidity. That is, since the predetermined uneven pattern is formed on the nonwoven fabric 51 by embossing, the rigidity of the rear flap is higher than when the uneven pattern is not formed on the nonwoven fabric 51.
[0010]
Embossing to increase the rigidity of the rear flap is performed by embossing a nonwoven fabric (or a laminate of a nonwoven fabric and a liquid-impermeable sheet) by embossing, so that the nonwoven fabric (or nonwoven fabric) is compared with that before embossing. The bulk softness value of the laminate of the liquid-impermeable sheet and the liquid-impermeable sheet is preferably increased by 1.5 times or more. The bulk softness value before and after embossing is measured as follows.
A non-woven fabric (or a laminate of a non-woven fabric and a liquid-impermeable sheet) is cut into a size of 100 mm in the MD direction (the same direction as the product flow direction) and 20 mm in the CD direction, and this is bent in the MD direction. The ends in the MD direction were overlapped by 2 mm, and fixed at two places with staples to prepare a cylindrical body having a height of 20 mm, which was used as a measurement sample.
And with Tensilon manufactured by Orientec Co., Ltd., the measurement sample was compressed at a speed of 10 mm / min in the axial length direction with a maximum load of 5 kg, and the maximum compression load (stress) in the compression process was read from the chart, This was defined as the bulk softness value. The size of the sample is a guideline, and the rigidity by embossing does not have to be the above size if the sample size before and after embossing is compared and compared.
[0011]
The back sheet 3 also has portions extending outward in the width direction from both side edges 41, 41 in the longitudinal direction of the absorbent body 4 at the front part A and the crotch part B of the napkin 1, A non-woven fabric 51 is also laminated on the extending portion, and a front flap 6 and a wing portion 7 are formed on the front part A and the crotch part B of the napkin 1, respectively. The wing portion 7 has a wing portion adhesive layer (not shown) formed by applying an adhesive on one side thereof. When the napkin is attached, the wing portion 7 is bent and bent from the base portion. The wing part 7 is fixed to the outer surface side of clothing such as shorts via a wing part adhesive layer. The sanitary napkin 1 is bound around the boundary between the rear flap 5 and the wing 7 in the longitudinal direction.
[0012]
The sanitary napkin 1 of the present embodiment can be easily and inexpensively manufactured by a manufacturing method including a flap forming laminate forming process, a main body forming process, and an adhesive application process. In addition, the point which is not demonstrated especially regarding a manufacturing method is performed in accordance with a conventional method.
[0013]
In the step of forming the flap-forming laminate, nonwoven fabrics 51 for forming flaps are respectively laminated on both longitudinal sides of the back sheet 3 having a predetermined width made of a resin film, and this laminate (hereinafter referred to as “the laminate”). Embossing is performed on the portion corresponding to the rear flap 5).
In this embossing, an embossing device comprising a pattern roll in which convex portions for pressurization are formed in a predetermined pattern on the peripheral surface, and a flat roll that is disposed to face the pattern roll and has a smooth peripheral surface, The laminated body is inserted between both rolls with the nonwoven fabric 51 side as the pattern roll side and the back sheet 3 side as the flat roll side, and heated and pressurized.
By this embossing, a large number of embossed grooves 52 are formed to extend in the width direction of the napkin, as shown in FIGS. 1 and 3, on the surface of the laminated body corresponding to the rear flap 5 as shown in FIGS. Is done. And the rigidity of the rear flap 5 increases by this embossing. Surface of the backsheet 3 side of the laminate after embossing, the degree of unevenness caused by error Nbosu becomes much smaller than the surface of the nonwoven fabric 51 side.
[0014]
The main body portion forming step is a step of forming the main body portion 10, and in this step, the skin contact surface and both side portions in the longitudinal direction are formed in the center portion in the width direction of the laminated body subjected to embossing. Is mounted and fixed using an adhesive or the like.
[0015]
The application process of the pressure-sensitive adhesive is a process of forming the pressure-sensitive adhesive layer 9 for fixing the rear flap. In this process, before or after the process of forming the main body part described above, the rear flaps 5 and 5 in the laminate are supported. An adhesive is applied to the back sheet 3 side of the part to form the adhesive layer 9.
As a method for applying the adhesive, a method in which the back sheet side is brought into contact with the hot melt coater head (slot coating method, porous coating method, etc.) or a non-contacting mist method (slot spray method, curtain spray). Law). Further, instead of directly applying to the back sheet 3 side, the adhesive is applied by the above application method to the release surface side of the release sheet that covers and protects the flap, and when the flap and the release sheet overlap, A method of transferring the adhesive to the back sheet 3 side can be mentioned.
[0016]
According to the sanitary napkin 1 of the present embodiment, the rear flap 5 is formed with a concave-convex pattern on the nonwoven fabric 51 by embossing so that the rigidity is enhanced. It is possible to prevent problems such as attachment troubles such as adhesion of the adhesive layer 9 for fixing the rear flap to other parts and feeling of discomfort during wearing. In addition, unlike other cases where other members such as a reinforcing sheet are placed on the rear flaps to increase rigidity, there is no need to increase the number of components or to provide significant equipment for processing. It does not worsen the performance or greatly increase the manufacturing cost.
[0017]
Moreover, since the embossing is integrally performed on the laminate of the nonwoven fabric and the liquid-impermeable sheet, the nonwoven fabric and the liquid-impermeable sheet are heat-sealed and rigidity is easily developed.
[0018]
From the viewpoint of more reliably obtaining such an effect, the area of the embossed portion is preferably 20% or more, particularly 40 to 100%, of the total area of the rear flap. Here, the area of the embossed portion is the total area of the area of the embossed groove and the area sandwiched between the embossed grooves.
[0019]
Moreover, according to the sanitary napkin 1 of this embodiment, the rigidity of the laminated body (laminated body which consists of the nonwoven fabric 51 and the extension part 31 of the back surface sheet 3) which comprises the back flap 5 is used, and the said nonwoven fabric 51 side is patterned roll. Since it is enhanced by embossing with the back sheet 3 side as the flat roll side, the transferability of the adhesive when forming the rear flap fixing adhesive layer 9 is excellent.
Moreover, since the unevenness | corrugation is formed in the surface by the side of the nonwoven fabric 51 of the rear flap 5 by embossing, it can reduce a contact area with a wearer's skin, and, thereby, the prevention of swelling and a feeling of wearing are further improved. .
[0020]
In addition, since the concavo-convex pattern having a large number of embossed grooves 52 extending in the width direction of the napkin 1 is formed by the embossing, the resistance to the external force applied from the side is high, and the twist and breakage of the rear flap portion are further increased. It can be effectively prevented.
From the viewpoint of obtaining such an effect more reliably, each embossed groove has an angle θ (see FIG. 1) with respect to a center line (a center line that bisects the napkin in the width direction) L extending in the longitudinal direction of the napkin (absorbent article). ) Is preferably 10 to 170 degrees, more preferably 45 to 135 degrees.
[0021]
Further, the embossed grooves of the concavo-convex pattern preferably have a groove width of 0.5 to 5 mm, particularly 3 mm or less from the viewpoints of touch and rigidity. Moreover, the width | variety of the protruding item | line part between embossing grooves is 0.5 mm-10 mm, and especially 5 mm or less is preferable from a viewpoint of improving rigidity.
[0022]
The material for forming the sanitary napkin 1 of the present embodiment will be described. As the topsheet 2 and the absorbent body 4, various materials conventionally used for absorbent articles such as sanitary napkins are used without any particular limitation. Can do. As the back sheet 3, a resin film conventionally used for absorbent articles such as sanitary napkins can be used without particular limitation.
Examples of the nonwoven fabric 51 for forming the rear flap 5 include generally used nonwoven fabrics such as an air-through nonwoven fabric, a heat roll nonwoven fabric, a spunbond nonwoven fabric, a melt blown nonwoven fabric, and the like. However, it is preferable because the thickness and thickness are easy to achieve even with a low basis weight, so that the texture and the touch are improved.
The nonwoven fabric 51 for the rear flap 5 forms, Ru with a nonwoven fabric made of core-sheath type composite fibers having the same resin component as the backsheet 3 in the sheath. It is good preferable in terms of heat sealing property between the back sheet 3 is superior to use such a nonwoven fabric. The basis weight of the nonwoven fabric is preferably 15 to 100 g / m ² , and the basis weight of the back sheet is preferably 15 to 60 g / m ² .
[0023]
In addition, the absorbent article of this invention is not restrict | limited to said embodiment, A various deformation | transformation is possible in the range which does not deviate from the meaning of this invention.
For example, the rear flap 5 in the above embodiment is composed of a laminated body of the extending portion 31 of the back sheet and the nonwoven fabric 51 for forming the flap, but the top sheet 2 made of the nonwoven fabric is used on both sides thereof. A part can be extended from the both-sides edge of the absorber 4 to width direction outward, the extension part and the extension part 31 of the back surface sheet 3 can be laminated | stacked, and a rear flap can also be comprised. Further, a sheet material for forming a three-dimensional gather having elastic members is provided on both sides of the main body portion 10 to provide a three-dimensional gather, and the sheet material is extended outward in the width direction from both side edges of the absorbent body 4. The extended portion and the extended portion of the back sheet 3 can be laminated to form a rear flap.
[0024]
Further, as shown in FIG. 4 (a), the embossing for imparting rigidity to the rear flap 5 is an embossed groove extending in a direction orthogonal to the width direction center line of the napkin (inclination angle with respect to the width direction center line L of the napkin). θ (see FIG. 1) may form a 90-degree embossed groove), and as shown in FIG. 4B, the inclination angle θ with respect to the center line L in the width direction of the napkin (see FIG. 1). Two types of embossed grooves 52a and 52b that are different from each other may be formed so as to intersect each other. Furthermore, instead of the linear embossed groove, a wavy embossed groove or an arc-shaped embossed groove may be formed.
[0025]
Further, the embossing for imparting rigidity to the rear flap 5 may be performed by forming a large number of concave portions 53 on the surface of the rear flap 5 on the nonwoven fabric 51 side as shown in FIG. In this case, the shape of the concave portion may be an arbitrary shape such as an ellipse, a triangle, a rectangle, or a star in addition to a circle. In addition to the staggered arrangement pattern as shown in FIG. 5, the arrangement pattern of the recesses may be a pattern arranged at a predetermined pitch in both the vertical and horizontal directions.
As shown in FIG. 5, when a large number of recesses are formed in a scattered manner, in addition to providing rigidity, the contact area with the skin is reduced, and the recesses are formed for the problem of non-woven fabric-specific fluff. By doing so, there is an advantage that fuzz can be prevented and the touch is improved.
[0026]
In the above embodiment, although an embossed by heat embossing apparatus comprising an embossing roll and a flat roll (both heating roll), instead of the embossing device comprising a d Nbosuroru and flat rolls, the use of a stamper You can also .
[0027]
Although the sanitary napkin 1 described above has the front flap 6 and the wing portion 7, the absorbent article of the present invention may not have the front flap 6 and / or the wing portion 7. good. In addition, when the front flap 6 and / or the wing portion 7 are provided, the absorbent article of the present invention may be embossed in the same manner as the rear flap 5 on either or either of them. Napkins, panty liners, incontinence pads, disposable diapers and the like.
[0028]
【The invention's effect】
The absorbent article of the present invention can prevent twisting of the rear flap while suppressing a decrease in productivity and an increase in manufacturing cost, and can prevent troubles during wearing and a sense of incongruity during wearing. It is excellent in the transferability of the adhesive when forming the layer.
[Brief description of the drawings]
FIG. 1 is a schematic front view showing a sanitary napkin as an embodiment of the present invention.
FIG. 2 is a schematic diagram showing an XX cross section of FIG. 1;
FIG. 3 is an enlarged schematic view showing a YY cross section of FIG. 1;
4 (a) and 4 (b) are main part schematic front views showing the main part of a sanitary napkin as another embodiment of the present invention, respectively.
FIG. 5 is a schematic front view showing a sanitary napkin as still another embodiment of the present invention.
[Explanation of symbols]
1 Sanitary napkin (absorbent article)
2 Top sheet (surface layer)
3 Back sheet (back layer)
4 Absorber (absorbing layer)
5 Rear flap 51 Non-woven fabric 31 Extension part of back sheet (liquid impermeable sheet)
9 Adhesive layer A Front part B Crotch part C Rear part

Claims (3)

Both sides of the rear part, which is provided with a liquid-permeable surface layer, a liquid-impermeable back layer, and a liquid-retaining absorbent layer interposed between the two layers, and is disposed at a position closer to the wearer's back when worn In the absorbent article having a rear flap that is adhesively fixed on the inner surface of the clothing such as shorts when worn,
The rear flap is composed of a liquid-impermeable sheet and a nonwoven fabric laminated on the skin contact surface side of the liquid-impermeable sheet, and the rear flap is formed by forming a concavo-convex pattern on the nonwoven fabric by hot embossing. Rigidity is enhanced, the adhesive layer for fixing the rear flap is formed on the clothing contact surface side of the liquid-impermeable sheet of the rear flap ,
The liquid-impermeable sheet is made of a resin film, and the nonwoven fabric is made of a core-sheath type composite fiber containing the same resin as a constituent resin of the resin film in a sheath,
The concavo-convex pattern is formed by applying the hot embossing to a laminate in which the liquid-impermeable sheet and the nonwoven fabric are laminated, and the surface of the rear flap on the liquid-impermeable sheet side is also concavo-convex. Absorbent article in which a pattern is formed . 2. The absorbent article according to claim 1, wherein the liquid-impermeable sheet is an extended part in which the back surface layer in the rear part is extended outward in the width direction from both side edges in the longitudinal direction of the absorbent layer. . The said uneven | corrugated pattern formed in the said nonwoven fabric is an absorbent article of Claim 1 or 2 which has at least many embossed grooves formed so that it might extend in the width direction of an absorbent article.

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