JP3676219B2 - Wearing article and manufacturing apparatus thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention mainly relates to disposable wearing articles such as sanitary napkins, incontinence pads, diapers, and pants, and an apparatus for manufacturing the same.
[0002]
[Prior art]
In recent years, a napkin having a compressed groove formed on the top sheet (liquid permeable sheet) side has been used (for example, Japanese Utility Model Publication No. 5-39691, Japanese Patent No. 3,053,561, Japanese Patent Application Laid-Open No. 2000-14701). ). Such a compressed groove is useful for preventing side leakage.
[0003]
[Problems to be solved by the invention]
However, the said pressing groove is formed by squeezing the surface of a napkin, Therefore, the softness | flexibility of a wearing article falls, for example, a wear feeling and a fall of a fitting property are caused.
[0004]
Accordingly, an object of the present invention is to improve the flexibility of a wearing article provided with a compressed groove.
Moreover, the other objective of this invention is to provide the manufacturing apparatus of this wearing article.
[0005]
[Means for Solving the Problems]
In order to achieve the object, the present wearing article includes a liquid-permeable sheet, a liquid-impermeable sheet, and an absorbent body sandwiched between the liquid-permeable sheet and the liquid-impermeable sheet. It is a worn article, and the worn article is formed with a compressed groove that is recessed from the liquid-permeable sheet side toward the absorber, and the bottom of the compressed groove in the absorbent body penetrates the liquid-impermeable sheet. A plurality of holes that are not formed are formed.
[0006]
In the present invention, the “compressed groove” refers to a groove formed by compressing the absorber in the thickness direction. The “compressed groove” only needs to be formed in at least one strip, but in the case of a napkin, two compressed grooves are generally formed in parallel along the length direction.
[0007]
The lower part of the “hole” in the absorbent body has the same degree of compression (bulk density) as the other lower part of the compressed groove, or a smaller degree of compression (bulk density) than the other lower part. Is preferred. This is because if the degree of compression of the lower part of the “hole” in the absorber is large, the bending rigidity in the part becomes large and the flexibility is lowered. As an extreme example, when the hole penetrates the absorber, the lower part of the hole does not exist, and the degree of compression becomes zero.
[0008]
The “hole” may not penetrate the absorber or may penetrate the absorber.
[0009]
On the other hand, in order to manufacture the wearing article of the present invention, a first pressurizing unit for pressurization provided with a ridge for forming a compression groove in the liquid-permeable sheet and the absorbent body, and the first pressurizing unit A second pressurizing unit for pressurizing the liquid-permeable sheet and the absorber between the first and second pressurizing units, and a plurality of holes forming the holes in the liquid-permeable sheet and the absorber. It is possible to use a manufacturing apparatus in which the protrusions are projected.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 schematically shows a plane and a cross section of a sanitary napkin.
In FIG. 1, the napkin N includes a core (absorber) C interposed between a liquid-permeable top sheet T and a liquid-impermeable back sheet B.
[0011]
Both side edges of the top sheet T and the back sheet B are joined to each other by a heat-sealed heat seal portion Hs, and the top sheet T and the back sheet B wrap around the core C. The core C is a fluff pulp obtained by pulverizing (pulverizing) pulp into a fiber using a defibrator (pulverizer) or a mixture of superabsorbent polymer particles (polymer absorber) mixed with the fluff pulp. It has a liquid-absorbing property. The core C of the present embodiment includes a tissue paper P that wraps the fluff pulp and the like.
The presence or absence of tissue paper and the portion where tissue paper wraps fluff pulp are determined by the state of fluff pulp, the amount and type of water-absorbing polymer particles, and the like.
[0012]
The napkin N is formed with a compressed groove 1 that is recessed from the top sheet T side toward the core C. The compressed grooves 1 are formed along the length direction of the napkin N and in parallel with each other in the vicinity of both side edges T1 of the top sheet T in the napkin N. In this embodiment, the compressed grooves 1 are formed in a loop shape. ing. The interval between the compressed grooves 1 is narrow in the middle portion of the top sheet T in the length direction.
By forming the compressed groove 1, it is possible to obtain an advantage of improving the fitting adhesion of the napkin N to the female local area or preventing side leakage.
In order to obtain such an effect, the compressed groove 1 may be formed so that the vicinity of the central portion of the core C is raised. In the napkin shown in FIG. 1, the compressed groove is formed in a loop shape, but the napkin may have a plurality of compressed grooves.
[0013]
As shown in FIG. 1A, a large number of holes 2 are formed at a predetermined pitch along the compressed groove 1 at the bottom of the compressed groove 1. These holes 2 penetrate the top sheet T of FIG. 1B but do not penetrate to the back sheet B. Further, when both surfaces of the core C are covered with the tissue paper P, the tissue paper P on the top sheet T side opens and penetrates, but the tissue paper P on the back sheet B side does not open. Is preferred. This is because even if the hole 2 is formed through the core C and the absorbent polymer falls off the core C, it is dammed by the tissue paper P.
Details of the properties of the compressed groove 1 and the hole 2 will be described later.
Further, in FIG. 1B, the compressed groove 1 and the hole 2 are exaggerated for easy understanding of the structure of the hole 2. For example, when the hole 2 is formed by a very thin object such as a pin, it will be difficult to visually observe the hole 2.
[0014]
Next, a forming apparatus for forming the compressed groove 1 of the napkin N will be described.
As shown in FIG. 2A, the molding apparatus includes a first roll 10 for pressurization that is a first pressurizing unit and a second roll 20 that is a second pressurizing unit. A continuous web W in which a core C is laminated at least under (or above) the top sheet T is supplied between the two rolls 10 and 20.
[0015]
The said 1st roll 10 is provided with the protruding item | line part 11 for forming the compression groove | channel 1, as shown to Fig.2 (a), (b). The shape of the ridge portion 11 corresponds to the shape of the compressed groove 1 in FIG. A large number of protrusions 12 are provided on the protruding line portion 11 in FIG. 2, and the protrusions 12 form holes 2 in the top sheet T and the core C.
[0016]
The second roll 20 presses the top sheet T and the core C between the first roll 10, and in this embodiment, a relief hole 21 is formed at a location corresponding to the ridge 11. Yes. Note that the portions of the protrusions 11, the protrusions 12, and the escape holes 21 are enlarged (larger) for easy understanding of the drawing.
The distance between the first roll 10 and the second roll 20 may be adjusted so that the protrusion 12 enters the escape hole 21. In such a case, even if the protrusion 12 rotates with the first roll 10, the shape of the escape hole 21 is determined so that the protrusion 12 does not hit the escape hole 21.
Further, the second roll 20 rotates in accordance with the rotation of the first roll 10. This is because the protrusion 12 and the escape hole 21 are synchronized.
[0017]
Next, a method for forming the compressed groove 1 and the like will be described.
As shown in FIG. 2A, when the continuous web W composed of the top sheet T and the core C is supplied between the pair of rolls 10, 20, the ridges 11 of the first roll 10, the second roll 20, Compressed groove 1 (FIG. 1) is formed. At this time, the bottom portion of the compressed groove 1 is pinched and tightened more than other portions of the core C to increase the bulk density.
[0018]
At the same time, as shown in FIG. 3A, the protrusion 12 is stuck in the top sheet T and the upper tissue paper P, and the through hole 3 is formed in the top sheet T and the upper tissue paper P in FIG. At the same time, a hole 2 is formed below the through hole 3. At this time, the protrusion 12 in FIG. 3A pushes the fluff pulp and the polymer absorbent forming the core C left and right by the conical needle-like protrusions 12, and the core C escapes toward the escape hole 21. Thus, the core 12 is not compressed by the protrusion 12. Therefore, the bottom part (lower part) of the hole 2 has the same bulk density per unit volume as the bottom part (lower part) of the compressed groove 1. As a result, the flexibility of the bottom of the compressed groove 1 becomes higher than before.
[0019]
After the molding, as shown in FIG. 3 (b) or 3 (c), a back sheet B is laminated under the core C, and then a known heat seal, trimming or the like is performed to form a napkin N. When the distance between the first roll 10 and the second roll 20 is adjusted so that the protrusion 12 does not penetrate the tissue paper P or the core C, a continuous web on which a back sheet is laminated is supplied to the molding apparatus. May be.
[0020]
As the holes 2 formed by the protrusions 12, as shown in FIG. 3B, the through-holes 3 are formed in the top sheet T and the upper tissue paper P, and the top sheet T and the upper tissue paper P are The fluff pulp and polymer particles constituting the core C that are not shaped along the holes 2 may be pushed to the left and right, or as shown in FIG. The tissue paper P may be formed in a shape along the hole 2. Furthermore, if a highly stretchable material is used as the top sheet T, the top sheet T may not be formed with a through hole.
[0021]
As described above, in order to prevent the bulk density at the bottom of the hole 2 from becoming large, it is preferable that the tip of the protrusion 12 in FIG. Good. Further, the protrusion 12 may be a polygonal pyramid in addition to the conical shape. Furthermore, as shown in the modification of FIG. 4, the hole may be a short groove-like hole 2 orthogonal to the compressed groove 1.
[0022]
In FIG. 3 (c), assuming that the thickness of the napkin N is t and the depth from the top sheet T to the bottom of the hole 2 is d, the depth d is generally set to 30% to 99% of the thickness t, Preferably it is set to 50% to 95%, more preferably 70% to 95%.
[0023]
The width Wi of the convex portion 11 in FIG. 2B is set to about 1 mm to 15 mm. When the width Wi of the convex portion 11 is wide, the protrusion 12 is formed as shown in FIG. Multiple rows may be used. The interval between the protrusions 12 is generally set to 0.5 mm to 3.0 mm.
[0024]
FIG. 5 shows a second embodiment of the napkin N.
As shown in this figure, the backsheet B of the napkin N has a pair of wing-like parts B1 protruding from the both side edges toward the side. The compressed groove 1 is formed so as to be parallel to each other along the length direction of the napkin N and inside the pair of wing-like parts B1 in the napkin N. The space between the compressed grooves 1 and 1 is such that the portion crossing the center of the two wings B1 in the width direction of the napkin N crosses the base B11 of the two wings B1 in the width direction of the napkin N. It is narrower than. That is, D2> D1 is set.
[0025]
FIG. 6 is a view showing a molding apparatus according to another embodiment.
The molding apparatus shown in FIG. 6 includes a first pressure unit having a first roll 10 </ b> A and a third roll 30 </ b> A and a second pressure unit having a second roll 20. The first roll 10 </ b> A has a ridge 11 for forming the compressed groove 1, and the third roll 30 </ b> A has a protrusion 12 that opens a hole 2 in the compressed groove 1. Moreover, the 2nd roll 20 of FIG. 6 has the escape hole 21 similar to the 2nd roll 20 of Fig.2 (a). The second roll 20 rotates at the same timing as the first roll 10A and the third roll 30A.
The forming apparatus shown in FIG. 6 forms the compressed groove 1 in the continuous web W by the first roll 10A, and forms the hole 2 in the compressed groove 1 by the third roll 30A.
[0026]
The second roll 20 may be configured such that the second roll 20 is developed on a plane. For example, it is good also as a structure which provides many escape holes 21 in a thick belt, and supports the part which the 1st roll 10 grade | etc., Contacts with a belt from under a belt. The same applies to the molding apparatus shown in FIG.
[0027]
As described above, the preferred embodiments have been described with reference to the drawings. However, those skilled in the art will readily understand various changes and modifications within the obvious scope by looking at the present specification.
For example, the shape of the protrusion 12 is not limited to a conical shape, and may be a shape in which a conical pointed tip and a columnar base end are integrated.
Accordingly, such changes and modifications are to be construed as within the scope of the present invention as defined by the claims.
[0028]
【The invention's effect】
As described above, according to the present invention, since the plurality of soft holes are formed at the bottom of the compressed groove, the bottom of the compressed groove in the absorbent body is easily bent by the hole, and thus the flexibility of the wearing article is high. Become.
[0029]
Moreover, according to the manufacturing apparatus of this invention, since the protrusion was provided in the convex part of the 1st roll, it can prevent that the position of a hole shifts | deviates with respect to a compression groove, and a wear article is finished with sufficient precision.
[0030]
Moreover, if an escape hole into which the protrusion fits is provided in the second roll, the hole can be formed in the absorbent body without damaging the worn article.
[Brief description of the drawings]
FIG. 1 is a plan view and an enlarged cross-sectional view of a napkin showing a first embodiment of the present invention.
FIG. 2A is a schematic configuration diagram showing a compression groove and hole forming apparatus, and FIG. 2B is a perspective view showing convex portions and protrusions.
FIG. 3 is an enlarged sectional view showing a hole forming method and structure.
FIG. 4 is an enlarged perspective view showing another example of a hole.
FIG. 5 is a plan view of a napkin showing a second embodiment.
FIG. 6 is a schematic configuration diagram showing another embodiment of a compression groove and hole forming apparatus.
[Explanation of symbols]
1: compression groove 2: hole 10, 10A, 30A: first pressurizing means 11: convex portion 12: protrusion 20: second pressurizing means 21: escape hole B: back sheet (liquid-impermeable sheet)
B1: Wing B11: Wing base C: Core (absorber)
N: Napkin (wearing article)
T: Top sheet (liquid permeable sheet)
T1: Both side edges of the top sheet

Claims (4)

A liquid-permeable sheet, a liquid-impervious sheet, and a wearing article comprising an absorbent body sandwiched between the liquid-permeable sheet and the liquid-impermeable sheet,
The wearing article is formed with a compressed groove that is recessed from the liquid-permeable sheet side toward the absorber,
A plurality of holes that penetrates the liquid-permeable sheet and does not penetrate the liquid-impermeable sheet are formed at the bottom of the compressed groove in the absorbent body,
The lower part of the hole in the absorbent body has the same or lower bulk density than the other lower part with respect to the other lower part of the compressed groove because the hole is formed by needle-like protrusions. Wearing articles that are In claim 1,
The compressed groove is formed along the length direction of the wearing article and in parallel with each other in the vicinity of both side edges of the liquid-permeable sheet in the wearing article,
A wearing article in which a space between the compressed grooves is narrow in an intermediate portion in a length direction of the liquid-permeable sheet. In claim 1,
The wearing article has a pair of wings protruding from the side edges of the wearing article to the side,
The compressed groove is formed so as to be parallel to each other along the length direction of the wearing article and inside the pair of wing-shaped parts in the wearing article,
The space between the compressed grooves is narrower at a location where the center of the two wings crosses the width of the wearing article than at a location where the root of the two wings crosses the width of the wearing article. Wearing articles. A wearing article manufacturing apparatus for manufacturing a wearing article,
A first pressurizing means for pressurization provided with a ridge for forming a compression groove in the liquid-permeable sheet and the absorbent body;
A second pressurizing unit for pressurizing the liquid-permeable sheet and the absorbent body with the first pressurizing unit,
In the first pressurizing means, a through hole is formed in the liquid-permeable sheet, and a hole is formed in the absorbent body by pushing away the absorbent body so that the absorbent body corresponding to the through hole is not compressed. A plurality of needle-like protrusions projecting from the ridge ,
The apparatus for manufacturing a worn article , wherein the second pressurizing unit for pressurization is formed with an escape hole into which the plurality of needle-like protrusions can be fitted .

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