JP5486290B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article used by being fixed to underwear such as shorts, such as a sanitary napkin, a panty liner (cage sheet), and an incontinence pad.

  As an absorbent article such as a sanitary napkin, a vertically long article is known which includes a top sheet, a back sheet, and a liquid-retaining absorbent disposed between both sheets. Further, in the absorbent article having such a configuration, the non-skin contact surface (non-skin of the back sheet) is used for the purpose of fixing the absorbent article to an underwear such as shorts and preventing displacement during use. It is known to form an adhesive portion formed by applying an adhesive on the contact surface (see, for example, Patent Document 1).

  In addition, it is known that a pattern that is visible from the outside by printing or the like is applied to a predetermined portion of the absorbent article. For example, Patent Document 1 discloses that the skin contact surface side of the back sheet (the surface facing the absorber) or the non-skin contact surface side of the top sheet (in the outer region located outside the peripheral edge of the absorber) The printed graphic (symbol or character, or an image or design composed of at least two color differences or changes, etc.) is provided on the side facing the wearer's clothing, and the graphic is viewed from the surface sheet side. An absorbent article that is made visible is described. According to the absorbent article described in Patent Document 1, it is said that an emotional effect can be given to the user who has seen the graphic, and the user's depressed mood can be reduced. Further, in paragraph [0033] of Patent Document 1, since the graphic is disposed between a layer that contacts the body and a layer that contacts clothing, the ink of the graphic is directly rubbed by skin or underwear. In other words, the removal of the ink and the transfer to other parts can be prevented.

  Further, Patent Literature 2 includes a combination of letters, figures, and the like that easily attract children's interest on the outer surface of the outer cover that forms the outer surface (non-skin contact surface) of training pants for toilet training for children. It is described that a visual character is printed.

JP 2005-523139 A JP-A-5-247701

  As the back sheet forming the outer surface (non-skin contact surface) of the absorbent article, a resin film is often used, and an adhesive that forms an adhesive portion on the outer surface of the back sheet made of the resin film, In order to fix the ink constituting the pattern, it is usually necessary to improve the wettability of the outer surface by a surface modification treatment such as corona discharge. However, after printing the pattern by applying ink to the outer surface of the absorbent article that has been subjected to surface modification treatment, if an adhesive is further applied to form an adhesive part, the ink adheres to the ink adhering part constituting the pattern. When the agent is applied repeatedly, the adhesive force of the formed adhesive part to the ink adhering part is weak, so when the absorbent article fixed to the underwear such as shorts is peeled off through the adhesive part after use, There is a possibility that the inconvenience that the adhesive constituting the adhesive part remains on the underwear side may occur. As a method for solving such a problem, a method of performing a surface modification treatment only on the ink adhering portion can be considered, but it is difficult to carry out such a partial surface modification treatment on a production line, There is a risk of increasing manufacturing costs.

  In addition, in order to avoid inconvenience when an adhesive part is formed on the outer surface (non-skin contact surface of the back sheet) of the absorbent article on which a pattern is printed, the surface of the absorbent article that is not exposed to the outside, For example, as described in Patent Document 1, when a pattern is printed on the skin contact surface (the surface facing the absorber) of the back sheet, the pattern is observed when the outer surface (non-skin contact surface) of the absorbent article is visually observed. May become unclear and the effects (such as improvement of visual impression) of printing a pattern on the absorbent article may not be sufficiently achieved.

  Therefore, the problem of the present invention is that the printed part is clear and excellent in the visual effect of the pattern, and the adhesive part is configured when the printed part is peeled off from the state fixed to the underwear through the adhesive part. An object of the present invention is to provide an absorbent article in which an adhesive is unlikely to remain on the underwear side.

The present invention relates to an absorbent article that is used by being fixed to underwear, and is a substantially vertically long absorbent main body comprising a liquid-retaining absorbent body and a back sheet disposed on the non-skin contact surface side of the absorbent body A non-skin contact surface of the back sheet is formed with a pattern including an ink adhering portion, and an adhesive portion that fixes the absorbent main body to underwear is at least part of the pattern An absorbent article that is formed so as to cover an undergarment that includes all of the adhesive portions formed on the absorbent main body and has the smallest area among the rectangular regions in plan view. In the case of the fixing region, the total area of the adhesive portion in the underwear fixing region is 35 to 80% of the area of the underwear fixing region, and the ink covered with the adhesive portion in the underwear fixing region Select any of the attached parts and When one imaginary straight line that passes through the selected ink adhering portion and crosses the underwear fixing region in the body width direction is drawn, the total length of the overlapping portion of the imaginary straight line with the ink adhering portion is The problem is solved by providing an absorbent article that is 50% or less of the length of the overlapping portion with the adhesive portion covering the ink adhering portion in a straight line.

  The absorbent article of the present invention has a good visual impression because the printed picture is clear and the visual effect of the picture is excellent, and information such as the features of the absorbent article is included in the picture. If it is, the information is easily transmitted to the user. Moreover, although the adhesive part which fixes this absorbent article to underwear is formed in the surface (non-skin contact surface) on which the pattern is printed, the absorbent article of this invention is interposed through this adhesive part. When the adhesive is peeled off from the state fixed to the underwear, the adhesive constituting the adhesive part hardly remains on the underwear side.

FIG. 1 is a plan view schematically showing a non-skin contact surface side (back sheet side) of a sanitary napkin that is a first embodiment of the absorbent article of the present invention. FIG. 2 is a cross-sectional view schematically showing a cross section taken along line II of FIG. FIG. 3A to FIG. 3C are plan views showing enlarged images formed on the napkin shown in FIG. 4 (a) and 4 (b) are plan views showing examples of virtual straight lines that traverse the underwear fixing region according to the present invention in the main body width direction. Fig.5 (a)-FIG.5 (d) are each a top view which shows the arrangement | positioning form of the pattern by the side of the non-skin contact surface of the sanitary napkin of an Example or a comparative example, and an adhesion part. FIG. 6A and FIG. 6B are explanatory diagrams of an evaluation method for the remaining adhesive. Fig.7 (a) and FIG.7 (b) are explanatory drawings of the evaluation method of the deflection | deviation rate of an absorbent article, respectively.

  Hereinafter, the absorbent article of this invention is demonstrated with reference to drawings based on the sanitary napkin which is one preferable embodiment. The absorbent article of the present invention is used by being fixed to an underwear such as shorts, and examples thereof include a panty liner (cage sheet), an incontinence pad, etc. in addition to a sanitary napkin. As shown in FIGS. 1 and 2, the napkin 1 according to the present embodiment substantially includes a liquid-retaining absorbent body 4 and a back sheet 3 disposed on the non-skin contact surface side of the absorbent body 4. A pattern 20, 30, 40 including the ink adhering portion 10 is formed on the non-skin contact surface 3 b of the back sheet 3, and the absorbent main body 5 is underwear. A main body adhesive portion 15 to be fixed to is formed so as to cover at least a part of the patterns 20, 30, 40. The napkin 1 has, in the longitudinal direction, an excretion part facing part A that faces the excretion part of the user during use, and a rear part B that is located on the rear side in the longitudinal direction of the excretion part facing part A.

  In the present specification, the skin contact surface is a surface of the absorbent article or a component thereof that faces the wearer's skin when the absorbent article is mounted, and the non-skin contact surface is the absorbent article. Alternatively, the surface of the member is directed to the side opposite to the skin side (underwear side) when the absorbent article is mounted. Moreover, a longitudinal direction is a direction along the long side of an absorbent article or its structural member, and a width direction is a direction orthogonal to this longitudinal direction. In the figure, the direction indicated by the symbol X is the main body longitudinal direction, and the direction indicated by the symbol Y is the main body width direction.

  As shown in FIGS. 1 and 2, the absorbent main body 5 is disposed between the top sheet 2 constituting the skin contact surface, the back sheet 3 constituting the non-skin contact surface, and both sheets 2 and 3. The liquid-retaining rectangular absorber 4 is provided and has a substantially rectangular shape that is long in one direction. The top sheet 2 and the back sheet 3 may be bonded to the absorber 4 with an adhesive. In the absorbent main body 5, the top sheet 2 and the back sheet 3 are respectively extended from the longitudinal front and rear ends of the absorbent body 4, and are joined to each other by known joining means such as heat sealing at the ends of the extended portions. Thus, an end seal portion is formed. The length of the absorbent main body 5 in the width direction Y is equal to the length of the absorbent body 4 in the width direction Y.

  As shown in FIG. 1, the main body adhesive portion 15 formed on the non-skin contact surface of the absorbent main body 5 (non-skin contact surface 3 b of the back sheet 3) has a rectangular shape in plan view, and its length A plurality are formed at predetermined intervals in the longitudinal direction X of the main body, with the direction aligned with the main body width direction Y. The plurality of main body adhesive portions 15 have the same shape and the same size.

  A pair of side flap portions 6 and 6 are disposed on both the left and right sides of the absorbent main body 5. The side flap part 6 is comprised by the extension part from the right-and-left both-sides edges 4s and 4s along the longitudinal direction of the absorber 4 of the surface sheet 2 and the back surface sheet 3, and in the edge part of these extension parts mutually The side seal portion is formed by bonding by a known bonding means such as heat sealing. The side flap portion 6 has a pair of wing portions 7, 7 and a pair of rear flap portions 8, 8 extending on the left and right sides in the longitudinal direction of the absorbent main body 5, and the rear flap portion 8 is more than the wing portion 7. It is located behind the main body longitudinal direction X. More specifically, the side flap part 6 is greatly projecting outward in the body width direction Y at the excretory part facing part A, whereby a pair of wing parts 7, 7 is extended. Moreover, the side flap part 6 has protruded largely toward the outer side of the main body width direction Y also in the rear part B, and thereby a pair of rear flap parts 8 and 8 extend on both the left and right sides of the absorbent main body 5. Has been.

  A front adhesive portion 16 for fixing the wing portion 7 to an underwear such as shorts is formed on the non-skin contact surface of the wing portion 7 (non-skin contact surface 3b of the back sheet 3), and the non-skin of the rear flap portion 8 is formed. On the contact surface (the non-skin contact surface 3b of the back sheet 3), a rear adhesive portion 17 that fixes the rear flap portion 8 to the underwear is disposed. Each of the front adhesive portion 16 and the rear adhesive portion 17 has a vertically long rectangular shape, and is arranged such that the longitudinal direction thereof coincides with the longitudinal direction of the main body. When the napkin 1 is fixed to the underwear, the wing portion 7 is folded back to the back sheet 3 side and is adhesively fixed to the non-skin contact surface of the underwear via the front adhesive portion 16. The rear flap portion 17 is not folded back when the napkin 1 is fixed to the underwear, and the non-skin contact surface is expanded (in a state extended to the side of the absorbent main body 5), and the rear adhesive portion 17. It is adhesively fixed to the skin contact surface of the underwear via. These adhesive portions 16 and 17 are provided by applying a hot melt adhesive to a predetermined location, like the main body adhesive portion 15, and are made of a film, a nonwoven fabric, paper, or the like before the napkin 1 is used. Not covered with a release sheet.

  In FIG. 3, in the napkin 1 of the present embodiment, three types of patterns 20, 30, and 40 formed on the non-skin contact surface of the absorbent main body 5 (non-skin contact surface 3b of the back sheet 3) are shown. It is shown enlarged. The patterns 20, 30, and 40 are formed by applying ink of a color other than the ground color (usually white) of the non-skin contact surface 3b to a predetermined portion of the non-skin contact surface 3b by printing, An ink adhering portion 10 formed by adhering the ink is included. The patterns 20, 30, and 40 (the ink adhering portion 10) can be visually recognized from the non-skin contact surface 3 b side including the portions covered with the adhesive portions 15, 16, and 17. The adhesive portions 15, 16, and 17 are usually colorless and transparent, and do not substantially affect the visibility of the pattern covered with the adhesive portion.

  The pattern 20 is a floral pattern including a star-shaped central portion 21 and a plurality (five in this embodiment) of petal portions 22 arranged so as to surround the central portion 21. The pattern 20 includes a non-ink adhesion portion 11 to which no ink is adhered, and the non-ink adhesion portion 11 is surrounded by the ink adhesion portion 10. That is, in the pattern 20, the outline of each part constituting the pattern 20 is formed by the ink adhesion part 10, and the region surrounded by the outline is the non-ink adhesion part 11. The ink adhering part constituting the pattern basically weakens the adhesive force of the adhesive part covering the ink adhering part to the absorbent main body side and causes the adhesive residue to remain. A pattern including many ink adhering portions is unlikely to cause such inconvenience.

  The pattern 30 is a floral pattern similar to the pattern 20, and includes a star-shaped central portion 31 and a plurality (five in the present embodiment) of petal portions 32 arranged so as to surround the central portion 31. It consists of Each of the central portion 31 and the valveable portion 32 is composed only of the ink adhering portion 10 and is a so-called solid ink coating portion. The pattern 40 is composed only of the ink adhering portion 10 having a star shape.

  The ink used for forming the patterns 20, 30, 40 (ink adhering portion 10) is not particularly limited as long as it is applicable to printing of this type of absorbent article. The ink contains, as coloring components, dyes and pigments used in ordinary printing inks, and usually contains various solvents and various additives. In addition, as a method for applying ink, a normal printing method can be used as appropriate, and examples thereof include an ink jet printing method and a gravure printing method. The ink may be applied by in-line processing using an absorbent article manufacturing apparatus in which a printing apparatus such as an ink jet printer is incorporated, or ink may be applied in advance to the forming material of the back sheet 3 by printing. In addition, the napkin 1 may be manufactured using the printed forming material.

  One of the main problems to be solved by the present invention is that when the absorbent article fixed to the undergarment through the adhesive section is peeled off from the undergarment, the pressure-sensitive adhesive constituting the adhesive section is the undergarment. In order to solve such a problem, in the present invention, A) is formed on the non-skin contact surface of the absorbent main body. Pay attention to the arrangement form of the adhesive part (main body adhesive part), and B) the relationship between the pattern (ink adhering part) formed on the non-skin contact surface of the absorbent main body and the adhesive part covering the pattern. ) And improved technology related to B) are adopted.

With regard to A), in the napkin 1 of the present embodiment, the area is the smallest among the quadrangular regions including all the adhesive portions (main body adhesive portions 15) formed in the absorbent main body 5 in plan view. If the stuff underwear fixed region P, the total area of the main adhesive portion 15 of the undergarment fixation area P (S1) has a 35 to 80% of the area of the undergarment fixed region P (S). In the present embodiment, the total area S1 corresponds to the total area of the plurality of main body adhesive portions 15. If S1 / S is less than 35%, the main body adhesive portion 15 is too small, and thus the absorbent main body 5 may not be stably fixed to the underwear. If S1 / S exceeds 80%, the main body adhesive portion 15 is not fixed. Due to the excessive amount, it may not be possible to prevent the remaining adhesive. S1 / S is preferably 45 to 75%, more preferably 50 to 65%. In the napkin 1 of the present embodiment, as shown in FIG. 1, in the underwear fixing region P, the main body adhesive portions 15 and the non-adhesive application portions 18 to which no adhesive is applied are alternately arranged in the main body longitudinal direction X. Is formed.

The undergarment fixing region P includes: 1) a front edge 15a along the body width direction Y in the body adhesive portion 15 closest to the longitudinal front end of the absorbent main body 5; and 2) a longitudinal rear end of the absorbent main body 5 3) a rear end edge 15b along the main body width direction Y in the main body adhesive portion 15 closest to the main body, and 3) a main body longitudinal direction through both side edges 15s and 15s along the main body longitudinal direction X of each main body adhesive portion 15. It is a region surrounded by two virtual straight lines (not shown) extending in X, and has a rectangular shape in plan view. In the present embodiment, the front end edge 15a, the rear end edge 15b, and the side edges 15s of the main body adhesive portion 15 are linear extending in the main body width direction Y or the main body longitudinal direction X, and these linear front end edges 15a. The rear edge 15b and the side edge 15s are boundary lines that define the underwear fixing region P, respectively, but when the front edge 15a and the rear edge 15b are non-linear such as a curve or a folding line, A virtual straight line extending in the main body width direction Y through the portion that protrudes most outward in the main body longitudinal direction X at the non-linear front end edge 15a or rear end edge 15b is defined as a boundary line that defines the underwear fixing region P. In addition, when the side edge 15s is a non-linear shape such as a curved line or a folding line, the side edge 15s extends in the main body longitudinal direction X through the portion that protrudes most outward in the main body width direction Y at the non-linear side edge 15s. a virtual straight line extending, defining the undergarment fixation region P That the boundary line.

  Regarding B), in the napkin 1 of the present embodiment, an arbitrary one is selected from the ink adhering portions 10 covered with the main body adhesive portion 15 in the underwear fixing region P, and the selected ink is selected. When one virtual straight line Q that passes through the attachment portion 10 and crosses the underwear fixing region P in the main body width direction Y is drawn, the total length (T1) of the overlapping portion with the ink attachment portion 10 in the virtual straight line Q is calculated. In the imaginary straight line Q, the length (T) of the overlapping portion with the main body adhesive portion 15 covering the ink adhering portion 10 is 50% or less. When the napkin 1 fixed to the underwear such as shorts is peeled off from the underwear through the main body adhesive portion 15, the main body longitudinal direction X is normally grasped by gripping the front end portion or the rear end portion of the napkin 1 in the main body longitudinal direction X. When the so-called T-shaped peeling is performed, the virtual straight line Q extends in the body width direction Y and moves along the body longitudinal direction X during the T-shaped peeling, and the boundary between the napkin 1 and the undergarment It corresponds to a line, and the main body adhesive portion 15 on this boundary line is peeled off substantially simultaneously by T-shaped peeling. When T1 / T is more than 50%, there are too many portions of the main body adhesive portion 15 covering the ink adhering portion 10. Therefore, the adhesive force of the main body adhesive portion 15 to the absorbent main body 5 is weak, and when the T-shaped peeling is performed. The main body adhesive portion 15 may be peeled off from the absorbent main body 5 and moved to the underwear side, and the adhesive residue may be generated. T1 / T is preferably 8 to 40%, more preferably 10 to 30%.

  4A and 4B, virtual straight lines Q1 and Q2 are illustrated as examples of the virtual straight line Q that crosses the undergarment fixing region P in the main body width direction Y. An imaginary straight line Q1 shown in FIG. 4A crosses the two petal portions 32a and 32b constituting the floral pattern 30. The petal portions 32a and 32b are the ink adhering portion 10 in the entire area. Therefore, the T1 for the virtual straight line Q1 is the sum of the length t1 along the virtual straight line Q1 of the petal portion 32a and the length t2 along the virtual straight line Q1 of the petal portion 32b. Further, T is the total length in the body width direction Y of the body adhesive portion 15 covering the petal portions 32a and 32b, and is equal to the entire width of the underwear fixing region P in this embodiment. In the portion where the virtual straight line Q1 is drawn, (t1 + t2) / T ≦ 50%.

  The virtual straight line Q2 shown in FIG. 4 (b) crosses the two petal portions 32a and 32b constituting the pattern 30 as well as the virtual straight line Q1, and three pieces constituting the floral pattern 20 The petals 22a, 22b and 22c are traversed. The petal portions 22a, 22b, and 22c are only the ink adhering portion 10 in their outlines, and the inside of the petal portion surrounded by the outline is the ink adhering portion 11, so that the petal portions 22a, 22b, and 22c are respectively virtual. The overlapping portions with the straight line Q2 are only the outlines of these petals, and in FIG. 4B, there are four places indicated by reference numerals t3, t4, t5, and t6. Therefore, T1 is the lengths t1, t2 along the virtual straight lines Q2 of the petal portions 32a, 32b, and the lengths t3, t4, t5 along the virtual straight lines Q2 of the contours of the petal portions 22a, 22b, 22c. , T6. In the portion where the virtual straight line Q2 is drawn, (t1 + t2 + t3 + t4 + t5 + t6) / T ≦ 50%.

  In the present embodiment, in order to further enhance the visual effect of the design, as shown in FIG. 1, a number of designs are provided on the non-skin contact surface 3 b of the back sheet 3 that forms the non-skin contact surface of the napkin 1. When 20, 30, 40 are formed, an improved technique is adopted for the arrangement of these patterns from the viewpoint of more reliably preventing the occurrence of adhesive residue. This is because the ink adhering portion constituting the pattern basically weakens the adhesive force of the adhesive portion covering the ink adhering portion to the absorbent main body side and causes the adhesive residue to be induced. That is, in this embodiment, the patterns 20, 30, and 40 are formed apart from each other in the main body width direction Y, and the length Ly in the main body width direction Y of each of the patterns 20, 30, and 40 (see FIG. 1). Is 20 mm or less, preferably 2 to 15 mm. The distance between the patterns adjacent to the main body width direction Y is preferably 3 to 10 mm, more preferably 5 to 15 mm.

  From the same point of view, in the present embodiment, the patterns 20, 30, 40 are formed to be separated from each other in the main body longitudinal direction X, and the length Lx (see FIG. 1) is 25 mm or less, preferably 4 to 20 mm. The distance between the patterns adjacent to the main body longitudinal direction X is preferably 3 to 10 mm, more preferably 5 to 15 mm.

  In particular, from the viewpoint of preventing the adhesive remaining when the napkin 1 is peeled off from the underwear, the pattern 20, 30, 40 has a length Lx in the body longitudinal direction X that is longer than the length Ly in the body width direction Y. The longer one is preferable. The ratio of Lx to Ly (Lx / Ly) is preferably 5.0 or less, more preferably 3.0 or less.

Moreover, in this embodiment, about each adhesive part 15, 16, and 17 currently formed in the non-skin contact surface (non-skin contact surface 3b of the back surface sheet 3) of the napkin 1, the said adhesive part is set to that Considering a virtual extension region that can be extended in the front-rear direction along the main body longitudinal direction X while maintaining the length in the main body width direction Y, the patterns 20, 30, and 40 are located in the virtual extension region. . The virtual extension region is a region located in the front and back of the main body longitudinal direction X including the underwear fixing region P for the main body adhesive portion 15, and the front adhesive portion 16 is a region indicated by a symbol R in FIG. is there. In addition, since the virtual extension area | region about the back adhesion part 17 is settled in the virtual extension area | region R about the front adhesion part 16, illustration is abbreviate | omitted. In this way, when the design is located inside any one of the virtual extension regions for each adhesive portion, it is possible to reduce the number of designs (ink adhering portions) that are not covered by the adhesive portion. However, it is possible to minimize the inconvenience that the ink constituting the pattern transfers to the underwear or the skin due to rubbing with the underwear or the skin.

  The material for forming each part of the napkin 1 will be described. As the surface sheet 2, various materials conventionally used in the technical field can be used without particular limitation. For example, various non-woven fabrics and openings that have been subjected to hydrophilic treatment can be used. A liquid-permeable sheet such as a hole film can be used.

  As the back sheet 3, various types conventionally used in the technical field can be used without particular limitation. The back sheet 3 may be liquid-impermeable or liquid-permeable. For example, a resin film that does not have moisture permeability, a resin film that has micropores and has moisture permeability, a nonwoven fabric such as a water-repellent nonwoven fabric, these and other A laminate with a sheet can be used. Since the back surface sheet 3 is provided with the pressure-sensitive adhesive constituting the pressure-sensitive adhesive portion and the ink constituting the pattern, the back surface sheet 3 is subjected to a surface modification treatment such as corona discharge from the viewpoint of improving the fixability thereof. Alternatively, a filler whose surface wettability is improved by kneading a filler for increasing wettability is preferably used. In addition, since the back sheet 3 is provided with ink by printing to form a pattern, from the viewpoint of improving the color development of the ink, the back sheet 3 has less unevenness and a smoother film sheet and dense constituent fibers. A water-repellent nonwoven fabric or the like filled in (with a relatively small gap between fibers) is preferably used. Examples of such nonwoven fabric include composite nonwoven fabrics such as spunbond-meltblown (SM), spunbond-meltblown-spunbond (SMS), spunbond-meltblown-meltblown-spunbond (SMMS), Nonwoven fabrics manufactured by the bond or air-through method and heat embossed can be used.

  As a material constituting the absorbent body 4, various materials conventionally used in the technical field can be used without particular limitation, for example, a fiber assembly made of hydrophilic fibers such as wood pulp and synthetic fiber, or A fiber assembly in which particulate superabsorbent resin is held can be used. The absorbent body 4 includes a liquid-retaining absorbent core (not shown) made of the fiber assembly and the like, and a liquid-permeable core wrap sheet (not shown) that covers the absorbent core. In this case, the absorbent core and the core wrap sheet may be joined to each other by a joining means such as a hot-melt pressure-sensitive adhesive at a predetermined site. As a core wrap sheet which coat | covers an absorptive core, paper, such as tissue paper, various nonwoven fabrics, an apertured film, etc. can be used, for example.

  As the forming material (adhesive) for the adhesive portions 15, 16, and 17, various materials used for forming the adhesive portion in this type of absorbent article can be used without particular limitation. For example, styrene-isoprene Examples thereof include adhesive resins such as block copolymers (SIS series) and styrene-butadiene block copolymers (SBS series) rubber resins, acrylic resins, and silicon resins. In addition, these adhesives may be applied continuously (in the form of a plane) (so-called solid coating), but in consideration of the adhesive remaining on the underwear in the applied area, they are applied intermittently. Preferably it is. Examples of the intermittent application form include a spiral shape, a stripe shape extending in the width direction, an Ω shape, and a dot shape.

  The napkin 1 of the present embodiment is used by being fixed to underwear such as shorts in the same manner as a sanitary napkin having a known wing part. In the napkin 1 of this embodiment, from the viewpoint of sharpening the printed pattern and enhancing its visual effect, the pattern 20, 30, 40 by the ink adhering portion 10 is printed on the non-skin contact surface 3b, and further The adhesive portions 15, 16, and 17 are formed on the adhesive layer, and it is feared that a so-called adhesive residue is generated when the adhesive parts are peeled off from the underwear after use. By adopting the adhesive part and the improvement technique of the pattern, the napkin 1 of the present embodiment is less likely to cause adhesive residue.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, the pattern, the arrangement form of the adhesive portions 15, 16, and 17, the shape in plan view, and the like are not limited to the above embodiment, and can be selected as appropriate. Moreover, in the said embodiment, although the sanitary napkin was mentioned as one of the application examples of the absorbent article of this invention, For example, it can apply also to a panty liner (orimono sheet), an incontinence pad, a disposable diaper, etc.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to such examples.

[Example 1]
A sanitary napkin having the same configuration as that shown in FIGS. 1 and 2 was produced and used as a sample of Example 1. However, the arrangement | positioning form of the adhesion part in the non-skin contact surface side of the sanitary napkin of Example 1 and the pattern was made into the form shown to Fig.5 (a). The form shown in FIG. 5A is different from the form shown in FIG. An air-through nonwoven fabric having a basis weight of 25 g / m ² was used as the top sheet ^{2, and} a moisture-permeable sheet having a basis weight of 37 g / m ² was used as the back sheet 3. As the absorber 4, the super absorbent polymers (SAP) containing 50 g / m ^2, using the sheet-shaped absorbent having a basis weight of 160 g / m ^2. The pattern was printed by a gravure printing method. In Example 1, S1 / S [the ratio of the total area (S1) of the adhesive portion in the underwear fixing area to the area (S) of the underwear fixing area] = 55%, T1 / T [ink in the imaginary straight line] Ratio of the total length (T1) of the overlapping portion with the ink adhering portion in the imaginary straight line to the length (T) of the overlapping portion with the adhesive portion covering the adhering portion] <50%.

[Example 2]
A sanitary napkin was prepared in the same manner as in Example 1 except that the arrangement form of the adhesive part and the pattern on the non-skin contact surface side of the sanitary napkin was changed to the form shown in FIG. 5B. Two samples were used. In the second embodiment, as shown in FIG. 5B, in the underwear fixing region P, the five main body adhesive portions 15a having a rectangular shape extending in the main body longitudinal direction X are spaced at a predetermined interval in the main body width direction Y. Between the main body adhesive portions 15a and 15a adjacent to each other in the main body width direction Y, a non-adhesive application portion 18 is provided. The five main body adhesive portions 15a are common in that all of the five main body adhesive portions 15a extend over the entire length in the main body longitudinal direction X of the excretory portion facing portion A. The adhesive part 15a located is shorter in the length direction X of the main body than the other four adhesive parts 15a. In addition, the pattern 50 in the second embodiment includes only the square-shaped ink adhering portion 10. In Example 2, the S1 / S = 37% and the T1 / T <50%.

[Comparative Example 1]
A sanitary napkin was produced in the same manner as in Example 1 except that the arrangement form of the adhesive portion and the pattern on the non-skin contact surface side of the sanitary napkin was changed to the form shown in FIG. One sample was used. In Comparative Example 1, as shown in FIG. 5C, in the undergarment fixing region P, two rectangular main body adhesive portions 15b extending in the main body longitudinal direction X are spaced at a predetermined interval in the main body width direction Y. A non-adhesive application portion 18 is provided between the main body adhesive portions 15b and 15b. Further, the pattern 51 in the comparative example 1 is composed of only the quadrilateral ink adhering portion 10. Compared to the second embodiment (see FIG. 5B), the pattern layout of the first comparative example is larger in each pattern and the interval between adjacent patterns is smaller. FIG. 5C shows a virtual straight line Q3 that traverses the underwear fixing region P in the body width direction Y, and lengths t1, t2, t3, and t4 along the virtual straight line Q3 of the pattern 51. . In Comparative Example 1, the S1 / S = 83% and the T1 / T> 50%.

[Comparative Example 2]
A sanitary napkin was prepared in the same manner as in Example 1 except that the arrangement form of the adhesive part and the pattern on the non-skin contact surface side of the sanitary napkin was changed to the form shown in FIG. Two samples were used. In Comparative Example 2, as shown in FIG. 5D, in the undergarment fixing region P, three rectangular main body adhesive portions 15c extending in the main body longitudinal direction X are spaced from each other at a predetermined interval in the main body width direction Y. A non-adhesive application portion 18 is provided between the main body adhesive portions 15 c and 15 c that are arranged and adjacent to each other in the main body width direction Y. The three main body adhesive portions 15a are common in that all of the three main body adhesive portions 15a extend over the entire length in the main body longitudinal direction X of the excretory portion facing portion A. The positioned adhesive portion 15c has a shorter length in the body longitudinal direction X than the other two adhesive portions 15c. The pattern arrangement in Comparative Example 2 is the same as that in Comparative Example 1. 5D shows a virtual straight line Q4 that crosses the underwear fixing region P in the body width direction Y, and lengths t1 and t2 along the virtual straight line Q4 of the pattern 51. In Comparative Example 2, the S1 / S = 34% and the T1 / T> 50%.

[Evaluation]
About the sample (sanitary napkin) of an Example and a comparative example, the adhesive remainder and the deflection | deviation rate at the time of mounting | wearing were evaluated by the following method, respectively. The results are shown in Table 1 below.

<Evaluation method for remaining adhesive>
As shown in FIG. 6, the adhesive remaining of the sample S (Sanitary napkin 1) is evaluated using test cloths 80 and 81 made of a cotton metal cloth. The test cloth 80 and the test cloth 81 have different dimensions. As shown in FIG. 6A, a test cloth 80 having a size capable of covering the entire region of the underwear fixing region P in the absorbent main body 5 of the sample S is attached to the underwear fixing region P via the main body adhesive portion 15. In addition, the test cloth 81 is bonded to each of the pair of rear adhesive portions 17 and 17. In addition, the pair of wing portions 7 and 7 are respectively folded back to the test cloth 80 side bonded to the undergarment fixing region P and bonded to the test cloth 80 via the front adhesive portion 16. Then, the sample S is placed on a flat acrylic plate with the side where the test cloths 80 and 81 are bonded together (the non-skin contact surface Sb side) facing down, as shown in FIG. A flat metal plate (size 30 × 100 mm, thickness 6 mm, weight about 150 g) 82 is placed on each part of the skin S of the sample S, and a load of 1 kg is further applied from above the metal plate 82 to 40 ° C. , Left in a constant temperature and humidity room of 80% for 24 hours. In FIG. 6 (b), the portion filled with black indicates the load. Thereafter, the load is removed, the test cloths 80 and 81 are peeled off from the sample S in the same temperature and humidity, and the bonded surface of the peeled test cloth 80 (the test cloth covering the undergarment fixing region P) is attached to the sample S by hand. If the hand becomes sticky, the adhesive remains, and if the hand does not stick, the adhesive remains. Evaluate 5 samples according to the above procedure, ○ if the number of samples with adhesive remaining is 1 or less, △ for cases with more than 1 sample with remaining adhesive, Δ The case where there are more than 3 samples with the remaining agent is marked as x.

<Evaluation method of twist rate at the time of wearing>
As shown in FIG. 7A, the sample S (sanitary napkin 1) is fixed to a sanitary short 90 according to a conventional method, 3 g of artificial blood is absorbed into the sample S, and the sample S is attached to the human body model 91 with drive. Wear fixed shorts 90 and walk for 1 hour. Thereafter, the shorts 90 are removed from the human body model 91, and the deflection rate is calculated by the following equation.
Twist rate (%) = {(W0−W1) / W0} × 100
In the above formula, W0 (see FIG. 7A) is “the skin contact of the excretory part facing part (between the wing parts 7 and 7) of the sample S before being fixed to the shorts 90 and attached to the human body model 91. W1 is “the length of the contact surface Sa side in the width direction”, and “W1 is the skin contact surface Sa side of the excretory part facing part A (between the wing parts 7 and 7) of the sample S after walking the human body model 91. It is the “length in the width direction”. The smaller the value of the twist rate, the higher the rating, indicating that the napkin was stably fixed to the shorts.

  As is apparent from the results shown in Table 1, in Examples 1 and 2, S1 / S is 35 to 80% and T1 / T is 50% or less, the pressure-sensitive adhesive residue is small, and the twist rate is low. In particular, Example 1 in which S1 / S was 55% had a lower twist rate than Example 2 in which S1 / S was 37%, and was a good result. On the other hand, in Comparative Example 1, S1 / S exceeds 80% and T1 / T exceeds 50%, and in Comparative Example 2, T1 / T exceeds 50%. The result was much remaining. From the above, it can be seen that when T1 / T exceeds 50%, the adhesive residue on the underwear is likely to be generated, and when T1 / T is 50% or less, the adhesive residue is hardly generated. On the other hand, if S1 / S exceeds 80%, the fixation of the napkin to the underwear is improved, and the occurrence of twisting of the napkin is suppressed, but there is a high possibility that the adhesive part covers most of the design. It can be seen that the adhesive remains on the underwear. Further, it can be seen that when S1 / S is less than 35%, the fixing performance of the adhesive part to the underwear is lowered, the napkin is likely to be twisted, and the mounting position is likely to be displaced due to the twist.

1 Sanitary napkin (absorbent article)
2 Top sheet 3 Back sheet 3b Non-skin contact surface 4 of back sheet Absorber 5 Absorbent body 6 Flap part 10 Ink adhesion part 11 Non-ink adhesion part 15, 15a, 15b, 15c Main body adhesive part 16 Front adhesive part 17 Rear Adhesive part 18 Non-adhesive application part 20, 30, 40, 50, 51 Pattern P Underwear fixing area Q Virtual straight line R Virtual extension area X Body longitudinal direction Y Body width direction

Claims (6)

Absorbent article used by fixing to underwear, comprising a substantially vertically long absorbent main body comprising a liquid-retaining absorbent body and a back sheet disposed on the non-skin contact surface side of the absorbent body, A pattern configured to include an ink adhering portion is formed on the non-skin contact surface of the back sheet, and an adhesive portion that fixes the absorbent main body to an undergarment covers at least a part of the pattern. An absorbent article formed on
In the region of all of the square shape in and plan view comprises an adhesive portion which is formed in the absorbent body, if the area was smallest underwear fixed area, the total of the adhesive portion of the lower attachment fixed region The area is 35 to 80% of the area of the underwear fixing region, and an arbitrary one is selected from the ink adhering portions covered with the adhesive portion in the underwear fixing region, and the selected When one imaginary straight line that passes through the ink adhering portion and crosses the underwear fixing region in the body width direction is drawn, the total length of the overlapping portion with the ink adhering portion in the imaginary straight line is An absorbent article that is 50% or less of the length of the overlapping portion with the adhesive portion that covers the ink adhering portion.   The absorption according to claim 1, wherein a number of the patterns are formed on the non-skin contact surface of the back sheet so as to be spaced apart from each other in the body width direction, and the length of each pattern in the body width direction is 20 mm or less. Sex goods.   3. A large number of the patterns are formed on the non-skin contact surface of the back sheet so as to be spaced apart from each other in the longitudinal direction of the main body, and the length of each of the patterns in the longitudinal direction of the main body is 25 mm or less. Absorbent articles. The absorbent article according to any one of claims 1 to 3, wherein the pattern has a longer length in the main body longitudinal direction than a length in the main body width direction. As the picture, and the non-ink ejection portions comprise a non-ink ejection portions which ink is not attached is according to any one of claims 1-4 having a picture that is surrounded by the ink ejection portions Absorbent article. For each of the adhesive parts formed on the non-skin contact surface of the absorbent article, the adhesive part is extended in the longitudinal direction of the main body while maintaining the length in the main body width direction. The absorbent article as described in any one of Claims 1-5 in which the said pattern is located in this virtual extension area | region when the virtual extension area | region which can be performed is considered.

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