JP4827628B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article used by being attached to clothing such as underwear.

An absorbent article is known in which an adhesive for fixing to clothing is applied to the outer surface of a back sheet. For example, a sanitary napkin (see Patent Document 1) in which an adhesive attachment means is provided in a substantially I shape on the clothing contact surface, or a sanitary napkin in which a pair of substantially arcuate adhesive stoppers is provided on the clothing contact surface. (See Patent Document 2).
However, it is known that conventional absorbent articles having a pressure-sensitive adhesive on the garment contact surface often generate unpleasant peeling sound when peeled off from clothing such as underwear after use. In order to reduce such peeling noise, it is conceivable to narrow the coating width of the adhesive, but if the coating width is narrowed, the function of preventing misalignment by the adhesive will be insufficient, and it will be attached to underwear, etc. The absorbent article in a state in which it is placed is likely to be displaced due to the operation of the user.
Thus, the conventional absorbent article cannot achieve both a reduction in peeling sound and a sufficient position shift prevention function, and the napkins described in the above documents 1 and 2 have the same problem. .

JP 63-54161 A Japanese Patent Laid-Open No. 3-191958

  Therefore, the objective of this invention is providing the absorbent article which can eliminate the fault which the prior art mentioned above has.

  In the present invention, a linear slip stopper made of an adhesive material is continuously formed in the longitudinal direction of the absorbent article on the clothing contact surface of the absorbent article, and at least one of the slip stoppers. However, the object is achieved by providing an absorbent article formed with a swing pattern having an amplitude in the width direction of the absorbent article.

  According to the present invention, since the linear misalignment is continuously formed in the longitudinal direction of the absorbent article, when peeling the absorbent article from clothing such as underwear and shirts such as shorts, Peeling progresses smoothly and it is possible to reduce peeling sound. In addition, since the linear misalignment is arranged so as to have an amplitude in the width direction of the absorbent article, the substantial area of the misalignment increases and the misalignment prevention performance is improved. Generation | occurrence | production of the position shift of an absorbent article can be prevented effectively.

Hereinafter, the present invention will be described based on preferred embodiments thereof.
The absorbent article of the present invention is of a type used by being attached to clothing such as underwear. This type of absorbent article generally includes a top sheet that comes into contact with the wearer's skin and a back sheet that comes into contact with clothing such as underwear. A liquid retaining absorber is interposed between the top sheet and the back sheet.

  As the top sheet and the back sheet, materials usually used in the technical field can be used without particular limitation. For example, as the surface sheet, liquid permeable sheets such as various nonwoven fabrics and perforated films subjected to a hydrophilic treatment can be used. As the back sheet, a liquid-permeable or water-repellent sheet such as a thermoplastic resin film or a laminate of the film and a nonwoven fabric can be used. The back sheet may have water vapor permeability. The absorbent article may further include various members according to specific uses of the absorbent article. Such members are known to those skilled in the art. For example, when the absorbent article is applied to a sanitary napkin or an incontinence pad, a pair of three-dimensional guards can be disposed on both the left and right sides of the absorbent article.

  In the absorbent article of the present invention, linear slip stoppers made of an adhesive material are continuously formed on the clothing contact surface in the longitudinal direction of the absorbent article. A clothing contact surface is a surface which contacts the clothing inner surface in an absorbent article. The inner surface of the garment is the surface of the garment that faces the wearer's skin. The misalignment preventing portion prevents a shift between the absorbent article and the clothing during use of the absorbent article.

Examples of the adhesive material constituting the misalignment-preventing portion include emulsion-based, water-based, solvent-based adhesives and adhesive tapes coated with them, from the viewpoint of obtaining sufficient misalignment prevention performance and stable productivity. An adhesive such as a hot melt adhesive is preferred.
Various types of adhesives that have been used in absorbent articles can be used without particular limitation, but a synthetic rubber-based block copolymer having a basic structure similar to natural rubber is mainly used. Is preferred. Examples of such a block copolymer include styrene-isoprene-styrene block copolymer (SIS), styrene-ethylene-propylene-ethylene copolymer (SEPS), and styrene-butadiene-styrene block copolymer (SBS). And styrene-ethylene-butylene-ethylene copolymer (SEBS). The pressure-sensitive adhesive preferably contains 10 to 65% by weight, particularly 30 to 50% by weight, of one or more base polymers selected from these block copolymers.

  The plurality of linear slip stoppers made of an adhesive material are formed on the clothing contact surface of the absorbent article so that the amplitude of the swing stopper of the swing pattern is not excessively increased. This is preferable because the displacement stopper can be arranged in a wide range of the contact surface.

In the absorbent article of the present invention, at least one shift stopper is formed in a swing pattern having an amplitude in the width direction of the absorbent article.
The said rocking | fluctuation pattern is a pattern which has the convex part which approaches one side edge of the longitudinal direction of an absorbent article, and the convex part which approaches the other side edge by turns in the longitudinal direction of an absorbent article. For absorbent articles that are placed between the human crotch by fixing the adhesive material to the underwear etc., such as sanitary napkins, panty liners (cage sheets), incontinence liners, incontinence pads, etc., the longitudinal direction (rocking of the adhesive material) The direction in which the pattern extends) substantially coincides with the wearer's front-rear direction.
Examples of the oscillating pattern include a wavy pattern formed in a curved line, a zigzag pattern formed linearly between the protrusions, and a spiral pattern in which one line intersects within the line. It is done. A plurality of misalignment stop portions having different swing patterns can coexist in one absorbent article.

FIG. 1 is a plan view showing a sanitary napkin according to an embodiment of the present invention as viewed from the clothing contact surface (surface on the back sheet side) 2 side.
On the clothing contact surface 2 of the napkin 1A shown in FIG. 1, three linear misalignment preventing portions 3 made of hot melt adhesive are formed. The hot melt pressure-sensitive adhesive constituting the misalignment stopper 3 is applied in a (wave) line shape on one side of the sheet constituting the back sheet using a gravure coater. A coating apparatus other than a gravure coater can be used for coating the hot melt adhesive, for example, a curtain coater, a spray coater, a spiral gun, a bead gun, etc. A gravure coater is preferable from the viewpoints of easy formation of various shapes such as a zigzag pattern and a spiral pattern and the sharpness of the shape.

The three misalignment stoppers 3 in the napkin 1A are all formed continuously in the longitudinal direction of the napkin. Further, as shown in FIG. 1, each of the misalignment stoppers 3 in the napkin 1A is formed in a wave pattern having an amplitude W (see FIG. 2) in the width direction of the napkin 1A.
The wave of the wavy pattern on the napkin 1A is composed of an arcuate portion 31 convex toward one side edge 11 in the longitudinal direction of the napkin 1A and an arcuate portion 32 convex toward the other side edge 12. The shape is alternately formed in the longitudinal direction. The arc-shaped portions 31 and 32 adjacent in the longitudinal direction are continuous without having a portion parallel to the width direction of the napkin therebetween.

If the amplitude of the swing pattern is too large, the peeling noise will be large as in the case of the conventional napkin in which the napkin width direction is formed, and if it is too small, the area of the adhesive will be insufficient. This makes it difficult to prevent slippage prevention.
From the viewpoint of achieving both reduction of peeling sound and anti-displacement performance, the amplitude W (see FIG. 2) of the swing pattern is preferably 2 to 20 mm, particularly 4 to 15 mm.
In addition, the amplitude W is a distance W1 between the convex portion 31 toward the one side edge 11 of the absorbent article and the convex portion 32 adjacent to the side edge 12 toward the other side edge 12. The distance between the midpoints 30 and 30 in the width direction of the absorbent article of the misalignment stopping portion 3) is defined as a distance that is equally divided into two.

From the same point of view, the displacement stopper 3 formed by the swing pattern has a ratio (W / L) of the amplitude W (see FIG. 2) to the length L (see FIG. 2) corresponding to the half cycle of swing. .3 to 0.7 is preferable, and 0.4 to 0.6 is more preferable.
In addition, the width W2 (width measured along the width direction of the absorbent article) of the slip stopper 3 is 1 to 5 mm, particularly 2 to 3 mm. This is preferable because it is easy and vibration of the sanitary napkin hardly occurs and generation of peeling sound is suppressed.

  In the napkin 1A, the three shift stoppers 3 do not intersect with other shift stoppers. Since the shift stopper 3 formed by the swing pattern does not intersect with other shift stoppers, it is possible to prevent the generation of peeling noise when the crossing part peels, and further reduce the peeling noise. is there. From the same point of view, when a plurality of linear shift stoppers made of an adhesive material are formed on the clothing contact surface, it is more preferable that none of the shift stoppers intersects other shift stoppers.

  Further, in the napkin 1A of the present embodiment, the shift preventing portions 3 and 3 adjacent in the width direction of the napkin 1A are directed toward the one side edge 11 toward the convex arcuate portion 31 and the other side edge 12. The convex arc-shaped portion 32 is at substantially the same position in the longitudinal direction of the napkin. Since the convex portion toward one side edge and the convex portion toward the other side edge are at substantially the same position in the longitudinal direction of the napkin 1, the slip stopper 3 is not crossed and the slip stopper 3 is not crossed. The amplitude W of the part 3 can be increased to increase the adhesive material area. Thereby, the position shift prevention performance can be further improved while preventing peeling noise.

  The shift stopper 3 formed in the swing pattern includes a convex portion 31 toward the one side edge 11 in the longitudinal direction of the absorbent article and a convex portion 32 toward the other side edge 12, respectively. It is preferable to have a plurality, and it is more preferable to have three or more each. Further, the length L1 of the slip stopper 3 (the linear distance along the absorbent article longitudinal direction between the position of the one end 33 and the other end 34) is 50 to 100% of the total length L2 of the absorbent article, 60 to 70% is particularly preferable.

The napkin 1A of the present embodiment is used by causing the slip stopper 3 formed on the clothing contact surface 2 to abut the inner surface of the underwear such as shorts (surface directed toward the wearer's skin). In the napkin 1A of the present embodiment, since the slip stopper 3 is formed in a swing pattern, the area of the slip stopper 3 increases, thereby increasing the frictional force with the underwear, Misalignment is effectively prevented.
On the other hand, when removing the napkin 1A, the napkin 1A is preferably peeled off from one end in the longitudinal direction toward the other end, but the shift stopper 3 is continuously formed in the longitudinal direction of the napkin 1A. Therefore, the peeling from the underwear such as shorts proceeds smoothly, and no peeling sound is generated or is greatly reduced even if it occurs.

  Further, in the napkin 1A of the present embodiment, the shift preventing portion 3 is formed in a corrugated pattern, and there is no bent portion or intersecting portion, so that the generation of peeling noise is further prevented.

  Hereinafter, other embodiments of the present invention will be described. In the following, differences from the above-described napkin 1A will be mainly described, and description of similar points will be omitted. The points described above in the description of the napkin 1A are appropriately applied to points that are not particularly described. FIGS. 3 to 6 and FIGS. 8 to 11 each show the surface of the sanitary napkin on the clothing contact surface side.

Four slip stoppers 3 are formed on the clothing contact surface 2 of the napkin 1B shown in FIG. The four misalignment stop portions 3 are each formed in a wavy pattern that is continuously formed in the longitudinal direction of the napkin 1B and has an amplitude in the width direction, like the misalignment stop portion 3 in the napkin 1 described above. ing.
In the napkin 1B of the present embodiment, the misalignment preventing portion 3 includes an arcuate portion 31 that protrudes toward one side edge 11 in one adjacent misalignment preventing portion 3 and the other side edge in the other misalignment preventing portion 3. The arc-shaped portion 32 that protrudes toward 12 is at substantially the same position in the longitudinal direction of the napkin. Further, the four linear displacement stoppers 3 in the napkin 1B (the same applies to the napkins 1C and 1D described later) are symmetrical with respect to the longitudinal center line of the napkin (center line extending in the longitudinal direction, not shown). Is formed.

On the garment contact surface 2 of the napkin 1C shown in FIG. 4, in addition to the two shift stoppers 3 formed in a waveform pattern, two linear shift stoppers 3A are formed. The two linear shift stop portions 3A are formed on both outer sides of the two shift stop portions 3 formed in a waveform pattern.
On the garment contact surface 2 of the napkin 1D shown in FIG. 5, in addition to the four shift stoppers 3 formed in a waveform pattern, one linear shift stopper 3A is formed. The linear shift stopper 3A is formed between the left and right shift stoppers 3 formed in a waveform pattern.
The linear shift stopper 3A is also preferably formed continuously in the longitudinal direction of the napkin 1C, 1D, and its width (measured along the width direction of the absorbent article) is 1 to 5 mm. In particular, the thickness of 2 to 3 mm is preferable from the viewpoint of easy operation by the wearer because the peeling becomes smooth.

On the garment contact surface 2 of the napkin 1E shown in FIG. 6, three shift stoppers 3 are continuously formed in the longitudinal direction of the napkin 1E. Each of the three misalignment stoppers 3 is formed in a zigzag pattern having an amplitude W (see FIG. 7) in the width direction of the napkin 1E.
As shown in FIG. 7, the zigzag pattern has a portion 31 bent convexly toward one side edge 11 in the longitudinal direction of the napkin 1E and a portion 32 bent convexly toward the other side edge 12. The napkin has a shape that is alternately connected in the longitudinal direction, and the convexly bent portions 31 and 32 are connected without interposing a portion parallel to the width direction of the napkin. Even when the zigzag pattern misalignment stopper 3 is provided like the napkin 1E of the present embodiment, the same effect as the above-described napkin 1 can be obtained. However, the wavy pattern is preferable from the viewpoint of preventing or reducing peeling noise.

On the garment contact surface 2 of the napkin 1F shown in FIG. 8, two misalignment preventing portions 3 and 3 formed in a waveform pattern (swing pattern) are formed. The two displacement stoppers 3 and 3 both have the amplitude W (from the portions 3E and 3E located in the vicinity of both ends in the longitudinal direction of the napkin 1F toward the portion 3C located in the longitudinal center of the napkin 1F. 2) has decreased. Specifically, the amplitude gradually decreases from each of the portions 3E toward the portion 3C. While the amplitude in the vicinity of both ends of the napkin 1F is relatively increased, the amplitude in the vicinity of the central portion is relatively decreased, so that the fixation before and after the sanitary napkin is increased, thereby stabilizing the mounting of the sanitary napkin. At the same time, the peeling noise can be further reduced.
The same effect can be obtained when the amplitude of the shift stop portion of the zigzag pattern is similarly changed.

  On the garment contact surface 2 of the napkin 1G shown in FIG. 9, four shift stoppers 35 to 38 are continuously formed in the longitudinal direction of the napkin 1E. Each of the four misalignment stoppers 3 is formed in a wavy pattern having an amplitude W (see FIG. 2) in the width direction of the napkin 1G, but the two overlap each other to form an ellipse (closed shape). Has a shape of a large number of lines.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to each said embodiment.
For example, as shown in FIG. 10, a spiral pattern misalignment stop portion 3B can be provided as the misalignment stop portion of the swing pattern having an amplitude in the width direction. In addition, as shown in FIG. 11, only one wavy pattern displacement stopper 3 can be provided on the clothing contact surface 2.
In each of the above embodiments, a sanitary napkin that is an absorbent article used by being fixed to an undergarment is given as one example of application of the present invention. However, the present invention applies to other absorbent articles as well. Applicable. For example, the present invention can also be applied to panty liners, incontinence liners, incontinence pads and the like, which are absorbent articles used by being fixed to underwear in the same manner as sanitary napkins. The present invention can also be applied to a urine pad used by being fixed inside a disposable diaper. Furthermore, the present invention can be applied to a breast milk pad that is fixed to a shirt or the like.

  Moreover, although each said embodiment was an absorbent article which does not have a wing part, the absorbent article of this invention is each laterally long from a longitudinally absorbent body and each side edge part of this absorbent body. A pair of wings extending to the outer surface, and the pair of wings may be fixed to the outer surface of the clothing via an adhesive or the like. In this case, the surface of the wing portion fixed to the outer surface of the clothing is not included in the clothing contact surface.

  The description omitted in one embodiment described above and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment can be appropriately changed between the embodiments. Can be substituted.

It is the top view which looked at the sanitary napkin as one Embodiment of the absorbent article of this invention from the clothing contact surface side. It is a partially expanded view which shows the detail of the rocking | fluctuation pattern in the sanitary napkin of FIG. It is the top view (figure 1 equivalent figure) which looked at the sanitary napkin as other embodiments of the absorptive article of the present invention from the clothing contact surface side. It is the top view (figure 1 equivalent figure) which looked at the sanitary napkin as other embodiments of the absorptive article of the present invention from the clothing contact surface side. It is the top view (figure 1 equivalent figure) which looked at the sanitary napkin as other embodiments of the absorptive article of the present invention from the clothing contact surface side. It is the top view (figure 1 equivalent figure) which looked at the sanitary napkin as other embodiments of the absorptive article of the present invention from the clothing contact surface side. It is a partially expanded view which shows the detail of the rocking | fluctuation pattern in the sanitary napkin of FIG. It is the top view (figure 1 equivalent figure) which looked at the sanitary napkin as other embodiments of the absorptive article of the present invention from the clothing contact surface side. It is the top view (figure 1 equivalent figure) which looked at the sanitary napkin as other embodiments of the absorptive article of the present invention from the clothing contact surface side. It is the top view (figure 1 equivalent figure) which looked at the sanitary napkin as other embodiments of the absorptive article of the present invention from the clothing contact surface side. It is the top view (figure 1 equivalent figure) which looked at the sanitary napkin as other embodiments of the absorptive article of the present invention from the clothing contact surface side.

Explanation of symbols

1A-1G Sanitary napkin (absorbent article)
2 Clothing contact surface 3 Displacement stop (Displacement stop formed by swinging pattern)
3A Misalignment stop (Linear pattern misalignment stop)
3B Displacement stop (Displacement stop formed by spiral pattern)

Claims (6)

A linear slip stopper made of an adhesive material is continuously formed in the longitudinal direction of the absorbent article on the clothing contact surface of the absorbent article, and at least one of the slip stoppers is absorbent. It is formed with a rocking pattern having an amplitude in the width direction of the article ,
It has a plurality of linear stoppers made of adhesive material, and the stoppers formed by the swing pattern do not intersect with other stoppers,
Having a plurality of misalignment stop portions formed by the swing pattern;
The swing pattern is a wavy pattern formed in a curve and the amplitude W is 2 to 20 mm,
As for the said slip prevention part formed with the said rocking | fluctuation pattern, the linear distance along the absorbent article longitudinal direction between the position of one end and the position of the other end is 60 to 70% of the full length of an absorbent article. ,
The slippage preventing portion formed by the swing pattern is an absorbent article in which a ratio (W / L) of the amplitude W to a length L corresponding to a half cycle of swing is 0.4 to 0.6. The plurality of misalignment stop portions formed in the swing pattern have a convex portion toward one side edge of the absorbent article and a convex portion toward the other side edge in the longitudinal direction of the absorbent article. The absorbent article according to claim 1, wherein the absorbent article is substantially at the same position. As the misalignment stop portion formed by the swing pattern, a plurality of misalignment stop portions in which convex portions directed to the opposite side edges of the absorbent article are at substantially the same position in the longitudinal direction of the absorbent article. The absorbent article of Claim 1 which has. The absorptive article according to claim 3 which has said linear slip stopper part in the both outsides of a plurality of said slip stopper parts. The absorptive article according to claim 3 which has said linear slip stop part between a plurality of said slip stop parts.   The said slip prevention part formed with the said rocking | fluctuation pattern has the said amplitude reduced toward the part located in the longitudinal direction center part from each part located in the longitudinal direction both ends vicinity of an absorbent article. The absorbent article according to any one of 5 above.

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