JPS5846102A - Diaper substrate and preparation thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disposable diaper base and a method for manufacturing the same.

In general, disposable diapers (hereinafter simply referred to as diapers) are made of absorbent fibers such as pulverized pulp, and four absorbent layers of a certain thickness are formed, and this is made of a top sheet (water-permeable upper layer material).
This type of diaper is sandwiched between a back sheet (water-impermeable thin film) and manufactured as a product, but when worn, the side edge of the diaper is located between the legs and touches the lower part of the body (inseam area), which is narrow and narrow at the waist. A shape with a wide portion, that is, an hourglass shape or a modified hourglass shape, is used as an absorbent body (substrate) for use in such diapers.

As a method for forming an absorber having such a shape, (1
) Absorbent fibers are laminated in advance to form the above shape (fiber stacking)
(2) Cutting and deleting the sides of the absorbent fiber laminate (usually in the form of a band) to obtain the above shape; (3) Making multiple cuts in the side of the absorbent fiber laminate. There is a method in which the portion sandwiched between the two cuts is folded toward the center of the laminate to obtain the above shape. however,
Disadvantages of method (1) above include the poor finish on the sides of the substrate, the inability to properly apply the water-absorbing paper used as an auxiliary material, and the need for separate equipment when forming two layers of mat in the center. In method 2), there is a large loss (cutting loss) of the laminate due to cutting and deletion of the side parts, and -
Disadvantages include the need for separate equipment to reuse the loss, and the need for separate equipment to create two layers of mat in the center.Moreover, method (3) requires a large number of straight parts; There are drawbacks such as difficulty in manufacturing curved or rounded shapes, and the lack of strength in the laminate, which makes it difficult to fold, making it impossible to make door tabs; these methods are strongly desired to be inexpensive. This is not an economically satisfactory method of forming an absorbent body.

The inventor of the present invention has conducted extensive research in order to find an economically satisfactory manufacturing method for diaper bases that does not have the above-mentioned drawbacks.As a result, the inventors have discovered a method of cutting a strip-shaped absorbent body into a specific shape and twisting it into a specific position. We have discovered that a diaper base having the shape described above can be economically produced without cutting loss by this method, and that relatively expensive water-absorbing resin can be effectively distributed in the base by this method, and we have developed the present invention. reached.

That is, the present invention consists of two absorbent bodies (parts) that are separated by making a wavy J1 zigzag-shaped incision in the longitudinal direction of the band-shaped absorbent body made of absorbent fibers and water-absorbing resin.
Overlap the straight side parts of both so that the cut part is on the outside and the wavy or zigzag shaped peaks (wide part) and valleys (narrow part) of both are in corresponding positions, and the center of the wide part is A disposable diaper base (first invention) characterized in that it is cut in the width direction at the section to have a deformed hourglass shape instead of an hourglass shape; A wavy or zigzag cut is made in the longitudinal direction of the strip-shaped absorbent body; then, while continuously feeding the two divided absorbent bodies (parts), the relative position of the two is adjusted so that the cut part is on the outside. Then, move the wavy or zigzag shapes so that the peaks (wide parts) and valleys (narrow parts) of both sides correspond to each other, and then overlap the straight side parts of both sides to form a waveform or zigzag shape. A disposable diaper, characterized in that a diaper base having an hourglass shape or a modified hourglass shape is continuously manufactured by forming a belt-like body; This is a method for manufacturing a substrate (second invention).

As the absorbent fibers constituting the absorbent body in the present invention, those commonly used in absorbent bodies for diapers can be used, and hydrophilic fibers, particularly fiber yarn fibers such as natural fibers (pulp, cotton, wool, jute, etc.) can be used. , semi-synthetic fibers (viscose rayon, acetate, etc.), and mixtures of these fibers. Among these, pulp, cotton, cotton waste, wool, viscose rayon, etc. are preferred, and rayon, pulp, and cotton are particularly preferred. Absorbent fibers come in various shapes such as staples, filaments, hollow fibers, crimped (bulky) threads, pulp, cotton, webs, sheets, mats, and fine fibers. can give. Among these, pulpy ones,
A cotton-like material is preferred.

Absorbent fibers are pulverized and/or opened in a conventional manner and then processed into a laminating machine (fluff former or mat former).
Laminate them to the required thickness and combine them with water-absorbing resin to create
It can be used as a collector.

In addition to Airf and Elt, we also use laminated paper cotton (multilayer crepe cellulose wallading), fluffed cellulose fibers, woven fabrics, nonwoven fabrics, and combinations of two or more of these (for example, absorbent fiber laminates). A combination of absorbent paper, filter sheet, non-woven fabric, etc. on one or both sides can also be used. Also, the absorbent fibers may be made into a laminate of 2'' or more sheets using two or more laminators; the absorbent fibers may be made into a double layer by folding the sides.

In the present invention, the absorbent body is made of absorbent fibers and water-absorbing resin. Usual water-absorbing resins can be used, and specific examples of such water-absorbing resins and methods of manufacturing absorbers made of water-absorbing resins and absorbent fibers (mixing method, mixing ratio) include, for example, special water-absorbing resins. Gansho 54-1
Examples include those described in No. 67085.

Furthermore, in addition to absorbent fibers and water-absorbing resin, a mixture of heat-fusible or soluble fibers may also be used as the absorbent material. Examples of such fibers and the method for producing the absorbent body include those described in Japanese Patent Application No. 101804/1983.

In the present invention, absorbent materials are absorbent fibers and water-absorbing resins (and heat-fusible or soluble fibers as necessary).
It may also have a multi-layer structure consisting of a mixed layer consisting of the above and an absorbent fiber layer. Examples of such a multilayer structure include Fig. 6 of Japanese Patent Application No. 167085/1983 and Japanese Patent Application No. 108/1982.
An example of this is shown in FIG. 8 of No. 804. Particularly suitable for the present invention is one having a mixed layer of water-absorbing resin and absorbent fibers continuously or intermittently on one or both sides of the strip-shaped absorbent body, for example, as shown in FIG. These are shown in (a) to (h). Such a multilayer structure is also disclosed in Japanese Patent Application No. 54-167085 and Japanese Patent Application No. 56
Manufactured by the method of No.-108804. be able to.

Moreover, instead of the above-mentioned mixed layer, it is also possible to use a layer in which only the water-absorbing resin is continuously or intermittently sprinkled on the absorbent fiber layer.
Examples include methods described by Naruko, such as JP-A No. 141099, JP-A-557151-960, and JP-A-56-60555. The amount of water absorbent resin to be sprayed is usually 5 to 100.
f/m is preferably 10 to 50 (//nl').

``The water-absorbent resin may be sprayed on one or both sides of the absorbent fiber laminate (IP) made of only one sheet, as shown in Figure 1 (i).'' (j ) and (k), the G-absorbent fiber laminate is sprayed on or near the sides (on both sides) of the G-absorbent fiber laminate as shown in (, 6, (k)).
Fold one or both of these sides to make double G.
It is also possible to make a laminate of two or more absorbent fibers as shown in Figure 1 (1) by laminating two or more absorbent fibers on top of each other. A strip-shaped absorbent body made of mustard may be formed with a water-absorbing resin.

As for those having the mixed layer, 1,
The sides can be folded over and the absorbent fiber laminate can have two or more layers.

The diaper base of the present invention consists of two (- or more) absorbent sheets (absorbent fibers and water-absorbing resin) each having a raw hourglass shape or a semi-deformed hourglass shape (an hourglass shape or a modified hourglass shape divided into two vertically). (consisting of) and overlap their straight side parts,
The structure is generally hourglass-shaped or modified hourglass-shaped, and such a substrate is manufactured from a strip-shaped absorbent body as described above.

The width of the belt-shaped absorbent body used in the present invention varies depending on the width of the waist portion (the widest portion) and the width of the crotch area (the narrowest portion) of the diaper base. The width X of the absorbent strip can be expressed by the following formula, where W is the width of the waist portion of the diaper base, y is the distance between the undulating or zigzag-shaped valleys in the inseam area, and 2
is divided into two parts according to the invention, preferably 70
~25H* (especially around U for children, around 200 txw for adults). The value of 2 is (y
±4.0) myi is preferably within the range.

The width of the band-shaped absorbent body is usually 250 to 50,041 mm. (around 8'OOm for children, 400 for adults)
Preferably around +u. ) The thickness of the strip-shaped absorbent body can be varied depending on the desired water absorption performance, but is generally 2 to 10 NIR, preferably ζKB to 6 Iff.

The material that is continuously sent out from the stacking machine (fiber stacking machine) can be used as it is as a strip collecting body! This is preferable because it can be used after being lightly compressed with a compression device (for example, an embossing roll press roll).

According to the present invention, the band-shaped absorbent material is divided into two parts by making a wavy or zigzag-shaped cut in the longitudinal direction (particularly in the center part in the longitudinal direction). , the normal waveform for example 2nd-(a)
, (b), (c)], zigzag shape [Fig. 2 (d)], and various modifications thereof [for example, Fig. 2 (e),
It is a concept that also includes (f) and ). The wavelength of the wave or zigzag pattern (the length from one peak to the next) (L in the diagram) is equal to the length of the diaper base, and is usually 800 to
750wIII (8oo~500m for children, 500~750m for adults). The amplitude (height difference between peaks and valleys) (A in the diagram) of the waveform or zigzag shape is usually 20~
1oojFjFhoma L, < Harho ~76ara
There is r-chi. The angle between the hypotenuse (the middle part between the peaks and valleys) of the waveform or zigzag shape (the i-line of the curve is its tangent) and the center line in the direction of the vertical blade (in Fig. 2, β (normally the lure is 0°) Preferably it is 80-50'.

To make a wave-shaped or zigzag-shaped cut in a strip-shaped absorbent material, a cutting device equipped with a blade shaped like this, such as a wave-shaped rotary cutter (wave diamond cutter →
A method of cutting using a cutting device such as a high pressure water jet nozzle (for example, a pressure crab of 1500 to 2500 kq/
Cd, nozzle straight 4! : For example, 0.1 to 0.8 zxt
) is moved periodically at right angles to the direction of movement and cuts are made in a wave or zigzag shape. The latter is preferable because the shape, size, wavelength, and amplitude of the incision can be freely changed in conjunction with a computer or the like.

The usual position for making wavy or zigzag cuts is the vertical center of the strip-shaped absorbent material; however, if two or more cuts are made to divide the absorbent material into three or more parts (sections), It does not have to be the central part in the vertical direction. (rz b *su';Ira+'tI (1)・]
As shown in Figure 8, the two absorbent bodies (1), (1) separated by making cuts as described above, have their cut parts (2), (2) on the outside and Both waveforms d and zigzag-shaped peaks (wide part) (p), (3)
and the valley (narrow width part) (') I (') are moved so that they correspond to each other, and the straight side parts (5) + (55) of both are overlapped. In this case, the separated absorption The width 2 of the part where the bodies overlap is shown in Figure 8 (a)
, As shown in (b), the distance between the troughs of the long zigzag-shaped troughs in the crotch area may be smaller than y; Fig. 8 (
e) May be greater than or greater than y, such as O; may also be the same as y.

As shown in Fig. 4, a method for moving the absorbent body to such a position is to divide the absorbent body into two parts (1), (1)
While continuously feeding the absorbent body, one side (1) of the absorbent body is rotated once on the roll (6) using a roll (6) placed on the absorbent body at an angle to the direction of movement of the absorbent body. One method is to move the absorber relative to the other (1). The rolls used in the above method are:
Rubber roll, Teflon roll! J: ln, o-
L Gold Ml roll etc. can be used. The direct transfer of the roll is
It depends on the width of the absorber, the amplitude and wavelength of the waveform or zig'zag shape, and the width of the overlapped part2, but usually 1
The order is from 00 to 800. In addition, instead of rotating the above-mentioned roll, a cylinder with many pores as shown in Fig. 4 (1) is used, and an air layer (
It is also possible to rotate the absorber (1) around the air roll. When rotating and moving on the air roll, there is no friction and the absorber (1) can move in any direction. Rotation and movement can be performed smoothly.

Also, as shown in Figure 4 (C)-;
You can also do that. In this case, the diameter of the row J is Imperial Palace 50~1
00 MM-, the spacing (pitch) between rolls is usually 100
~400 friends. By increasing or decreasing the roll interval, the width 2 of the overlapping portion of the absorber (1) and (i5) can be freely changed.

Rotate one side of the absorber on the roll as above, (j+n
) can be delayed by L (n is an integer) and simultaneously moved by a predetermined distance (A + y) in the width direction.

°Also, two or more strip-shaped absorbent bodies are each cut into the above-mentioned shape and cut into two parts, and the absorbent bodies separated from different strip-shaped absorbent bodies are combined to form a structure as shown in FIG. Alternatively, as shown in Figure 2(g), two (or more) wave-shaped, jig-shaped, or j-shaped cuts can be made in the strip membrane or container. Divide into two (or more) absorbent bodies (parts) and
1) Manufacture an inner absorbent body (15) in which the ridges and troughs of (1') are stacked at corresponding positions, or a stack of these as shown in Figure 8(d). In these cases, the angles α and β shown in FIG. 1 can be different (for example, α is 48° and β is 42°).

As a band-shaped absorbent body, for example, one made of a single laminate as shown in Fig. 1 (i), one with both side parts folded back like a band, and one with side parts like 2) Figure 5 (a) when one is folded in or the other is made of two laminates as shown in (1), cut and overlapped.
, (b), (e), (this), (d), or (j) are obtained.

Absorbent body (1) whose relative position has been moved as described above.

(1') is stacked as shown in FIG. 8 and then cut in the width direction at the center of the wide portion to obtain an hourglass-shaped or modified hourglass-shaped diaper base. The cutting position may be in the middle of the wide part, but it may be cut slightly from the middle (for example, 0
-1001m, preferably 5-20111m, more preferably 10-15m) by cutting at shifted positions.

The length of the front part (from the crotch area to the front end) and the rear part (from the crotch area to the rear end) of the diaper base may be different.

In this way, the length of the diaper base obtained is usually ゛8
00 to 750 MM (800 to 500 MM for children and 500 to 750 MM for adults), waist width usually 200 to 450 mm, preferably 250 to 8
00°M shoulder 1. The width of the inseam area is usually 50~1g, preferably 70~25011g (70~120cm for children,
For adults, 200~25G+w*), the front length is usually 120~4001ff- (preferably for children, 18
0-250m, 220-8501mm for adults), the rear length is usually 150-475mm (preferably 1mm for children)
50-20, and 250-8951M for adults.

The superimposed absorbent body as described above according to the invention is optionally heated and/or heated. can be compressed.

Is there a hot air stove or sakushionpa as a heating method? It is processed without compression using a heat treatment machine.

Examples include a method of heating, a method of heating and compressing using a hot press, a heat roll, a heat embossing surface roll, etc. Heating and/or compression may be performed before or after the above-mentioned cutting, or may be performed at the same time as the cutting. The diaper base is
It is manufactured by combining a top sheet and a back sheet in the same way as regular disposable diapers (paper diapers). The top sheet (water-permeable top layer material) can be any flexible, soft-touch porous paper or non-woven web, and the back sheet (impermeable water-based film) can be a flexible polysheet. Specific examples thereof include those described in JP-A-50-90489 and JP-A-51-50989.

The top sheet may be laminated after manufacturing the diaper base of the present invention, or may be laminated during its manufacture (before laminating or cutting the absorbent bodies), or may be laminated before its manufacture (before laminating the absorbent strips). (during or after). The backsheet is usually overlapped after the diaper base is manufactured.

The top sheet and back sheet are similar to normal ones, and have a width (usually 15 to 15 mm) wider than the diaper base (absorbent).
70 mm, preferably 20 to 40 mm), and 1. The portion beyond the edge of the absorbent body is fixed by any fixing means. The fixing means can be the same as conventional ones,
For example, Japanese Patent Publication No. 50-90489.

There are 0 items listed.

Further, the diaper can be provided with side flaps having elastic members on the side edges thereof, thereby preventing leakage from the gap between the legs and the diaper. like this·
JP-A-50-90 for elastic members and side flaps.
Examples include those described in No. 489.

Examples of the diaper base of the present invention and the apparatus used to manufacture diapers using the same are shown in FIGS. 6 and 7. In Fig. 6, while continuously feeding rayon paper (tissue) (7) onto the vacuum box (8), scraping off the pulp (9) from the mat former with the garnet cylinder cylinder αη, The water-absorbing resin @ is sprayed intermittently from a nozzle (toward) on a part of the falling range to form a pulp laminate Qd having a mixture layer a4 of water-absorbing resin and pulp on one side. After forming this and lightly compressing it with an embossing roll Q, a high-pressure water jet nozzle αη is placed in the longitudinal center part to make a wave-shaped or zigzag-shaped incision to form two absorbers (1>, (r)). Separation; one side (
1) is rotated on the two folding rollers (6) and moved relative to each other to overlap it on the other side (f) of the absorbent body; Next (after folding, the mat cutter (g) is used to fold around the center of the wide part The diaper base θ Samurai of the present invention is manufactured by cutting the sample.

In addition, in Figure 7, rayon paper (tissue)
While continuously feeding (7) onto the vacuum box (8)', scrape off the pulp (9) from the mat former 〇〇 with a garnet cylinder αp to form a pulp laminate OI9; water absorbent resin 02
is spread and laminated by the gravure roll (spreading device) (1); then, it is lightly compressed by the embossing roll O→, and the longitudinal center portion is cut with a wave diamond cutter to form two absorbers (1). ), (fold); one side (1) is rotated on the two folding rollers (6) and moved relatively to overlap with the other side (1) of the absorbent body; then, after pressing, the mat The diaper base 01 of the present invention is manufactured by cutting near the center of the wide portion using a cutter Ql tc. In this way, on the lower side of the diaper base a obtained, poly film I20 was coated with hot melt adhesive on the end and side parts using a hot melt nozzle, and on the upper side, a nonwoven fabric was applied. Diapers can be manufactured by continuously feeding and overlapping; sealing with side seals (c) and end seals (e); and cutting the end portions. In the above, a fluff former may be used instead of a mat former; spraying of the water-absorbent resin may be carried out continuously or intermittently, and the water-absorbing resin may be sprayed continuously or intermittently, and It may be sprayed or dispersed on one side or both sides; one or both sides of the band-shaped absorbent body may be folded in.

The diaper base and the manufacturing method thereof of the present invention have the following effects: (1) An hourglass-shaped or modified hourglass-shaped diaper base can be easily manufactured from a strip-shaped absorbent body without cutting loss. (2) The area near the longitudinal center line of the diaper, where high water absorption performance is required, is thicker than the side portion of the waist portion, where high water absorption performance is not required, which is advantageous in terms of water absorption capacity. -(3) By changing the shape of the wavy or zigzag cut, the shape of the diaper base can be changed in various ways. (4) High water absorption ability by using an absorbent fiber layer having a continuous or intermittent layer of water absorbent resin or a mixed layer of this and absorbent fibers on the sides of the absorbent strip as an absorbent material. Since it is possible to obtain a diaper base that contains water-absorbing resin only in the longitudinal centerline portion required for water-absorbing ability and water-absorbing resin (
It is ideal in that there is no waste (more expensive than absorbent fibers). (5) By the method of the present invention (second invention), it can be manufactured economically by connecting with a stacking machine (fiber stacking machine), and is suitable for mass production. (6) Even when excessive tension is applied during wear, the overlapped portions of the absorbent body only shift, and the absorbent body will not be stretched and become unusually thin.

The present invention will be explained below with reference to Examples.

Example 1 Using an apparatus as shown in Fig. 7, a belt-shaped absorbent material is produced in which pulverized pulp is laminated on water-absorbing paper by a fiber stacking machine (mat former) and continuously fed out. (width 8
10 tttm, thickness 5 mm, speed IQQ m/min)
A water-absorbing resin (Sunwet IM-800) pulverized to 0 to 800 mesh was continuously sprayed and layered using the device described in JP-A-54-141099 (sprayed amount 20
1, width 100 mm) to form a belt-shaped absorbent body as shown in FIG. 1(i). Next, this water absorbent resin (II)
A strip of absorbent fibers (It) was compressed using an embossing roll while continuously feeding the absorbent material to the extent that the water-absorbing resin (DI) and absorbent fibers (If) would not fly apart or lose their shape. Using a rear wave die cutter, create a waveform (width A = 80 mm, 1 wavelength L = 400 mm, - hypotenuse and vertical direction) as shown on the left side of Figure 2 (a) and Figure 4 (a) in the vertical center part using a rear wave die cutter. Angle between center line α-β = 400)
Make a notch. Next, the absorber is divided into two parts (
1), (1'), two rolls (diameter 10011, length 800m
tx ) (o), make one rotation of the absorber (1) on the roll, delay by 1/2L, and place it on the other absorber (r) as shown on the right side of Figure 4, and then When cut in the width direction at the center of the wide width part, an hourglass-shaped diaper base having a water-absorbing resin layer in the center as shown in Fig. 8 (waist part width W = 2'80 *ts inseam area) A width of 120 mm and a length of 400 mm was manufactured.

Using the device shown in Fig. 6, the patent application
A water-absorbent resin (Sunwet IM-800 manufactured by Sanyo Chemical Industries, Ltd.) pulverized into 80 to 145 mesh was intermittently applied to only a part of the laminated area using the fiber stacking machine described in Example 2 of No. 6908. (spray amount 4oy/n)
t') A belt-shaped absorbent body consisting of a mixed layer (1) of absorbent fibers and water-absorbing resin and an absorbent fiber layer (It) as shown in FIG. Friend, mixed layer (
Width of part 1) I Q Q ff, length 200 MM
, thickness 5 figure M i gap 200 between mixed layers
The strip-shaped absorbent material (at a speed of 100 m) that is continuously sent out from the above-mentioned fiber stacking machine to form the fiber stacking machine is compressed with embossing rolls to the extent that it does not lose its shape, and is then compressed with a high-pressure water jet nozzle linked to a microcomputer. , a modified zigzag shape (width A"90MM, wavelength 'L=4QQIff) as shown in FIG.
, an angle α-β-40°], then the two divided absorbent body (1) *, ('1') were moved in the same manner as in Example 1, overlapped, and the wide part Cut in the width direction at the center of the diaper base to form a modified hourglass-shaped diaper base as shown in Figure 9 (width of waist W = 800 + a
, width of inseam area 1201111. A length of 400 gg+) was manufactured.

[Brief explanation of the drawing]

Figures 1 and 4 are perspective views, Figures 2, 8, and 6 (b
), Fig. 7(b), Fig. 8(a), Fig. m9(a) l-c top view, Fig. 5, Fig. 6(a), Fig. 7(a), Fig. 8(b) 1. FIG. 9 (13) is a cross-sectional view. In the figure ('I
) is a mixed layer of absorbent fibers and water absorbent resin, (11) is an absorbent fiber layer, @) is an absorbent resin, (11, (1)' is an absorbent body, (2), (2') are Cutting part, (3). (35 is the wide part, (4), , '(4) is the narrow part (5), (55 is the straight part, and (6) is the column. Figure 2) a) <b> Total of 91 flashes

Claims (1)

[Claims] 1. A band-shaped absorbent body made of absorbent fibers and absorbent resin is divided into two by cutting in a wavy or zigzag shape in the longitudinal direction. Overlap the straight side parts of both so that the peaks (wide part) and troughs (narrow part) of both reach or zigzag shapes correspond to each other, and then align the straight sides of the two in the width direction at the center of the wide part. A disposable diaper base characterized by being cut into an hourglass shape or a modified hourglass shape. 2. The diaper base according to claim 1, wherein the absorbent fibers are made of pulverized pulp, paper cotton, cotton, rayon, or a combination thereof.゛8. The diaper base 24 according to claim 1 or 2, wherein the strapping storage body has a highly absorbent layer made of water absorbent resin and absorbent fibers on the side portions, and the position where the incision is made is The diaper base according to claim 1.2 or 8, which is the longitudinal center portion of the strip-shaped absorbent body. 5. The strip-shaped absorbent body made of absorbent fibers and water-absorbing resin that is continuously fed is cut in the longitudinal direction in a wavy or zigzag shape, and then the two separated absorbent bodies are continuously While feeding it to After that, the straight sides of both are overlapped to form a band whose edges on both sides are wavy or zigzag; further, the band is cut in the width direction at the center of the wide part to create an hourglass shape or deformation. A method for manufacturing a disposable diaper base, characterized by continuously manufacturing an hourglass-shaped diaper base. 6. Movement of the relative position of the two divided absorbent bodies by rotating one side of the two divided absorbent bodies once on one or more rolls placed obliquely to the direction of movement of the divided absorbent bodies. The manufacturing method according to claim 5, which comprises: 7. The manufacturing method according to claim 5 or 6, wherein a cut is made in the longitudinal center portion of the strip-shaped absorbent body.