JP2003159276A - Manufacturing method for absorbing body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for an absorbing body by which a stable and high performance continuous production of the absorbing body having a central absorbing body and side absorbing parts placed at the both sides of it is possible and polymer leaking dose not occur even in the case when a water-absorbent polymer is contained in the side absorbing parts. <P>SOLUTION: This manufacturing method for the absorbing body is composed of a turning process that forms a side absorbing part 43 comprising a two layered fiber web by turning both sides 12a and 12a of a belt like first fiber web 12 that is continuously carried, a process to form a central absorbing part 42 comprising a two layered fiber web by laminating a second fiber web 17 on the central part in the width direction of the first fiber web 12, and a process to cut an absorbing continuous body 40 formed with the side absorbing parts 43 and the central absorbing part 42 into each size of the absorbing bodies. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a disposable diaper,
The present invention relates to a method for producing an absorbent body capable of continuously and stably producing an absorbent body for a disposable absorbent article used for treating excretory liquids such as urine and menstrual blood such as incontinence pads and sanitary napkins.

[0002]

[Prior Art and Problems to be Solved by the Invention] Japanese Patent Publication No. 7-28892 discloses an absorber in a crotch part.
The first absorber arranged in the central part and the second absorbers located on both sides of the first absorber
A disposable diaper constructed with an absorbent body is described. In this disposable diaper, the region where the second absorber is arranged fits around the legs of the wearer, and the wearing feeling and the leakage prevention effect are good. However, since the first absorber and the second absorber are completely separated, there is a problem that processing stability and high-speed productivity are poor. In other words, the distance between the first absorbent body and the second absorbent body may fluctuate or the second absorbent body may turn up during transportation during manufacturing, and accordingly, the formation position of the second absorbent body or the formation position of the second absorbent body. There was a risk that the placement position would change. Further, when the water absorbent polymer is to be arranged in the area where the second absorber is arranged, polymer leakage may occur.

Therefore, it is an object of the present invention to stably and continuously produce an absorbent body having a central absorbent section and side absorbent sections located on both sides of the central absorbent section, and to produce a water-absorbing polymer in the side absorbent section. An object of the present invention is to provide a method for producing an absorbent body that does not cause polymer leakage even when it is contained.

[0004]

DISCLOSURE OF THE INVENTION The present invention is a method for manufacturing an absorbent body which continuously produces an absorbent body having a central absorbent section and side absorbent sections located on both sides of the central absorbent section. A folding step of folding back both side portions of the first fibrous web in the width direction to form a side absorbent portion composed of two layers of the fibrous web, and laminating the second fibrous web on the widthwise central portion of the first fibrous web. And a step of forming a central absorbent portion composed of two layers of fibrous web, and a step of cutting the continuous absorbent body on which the side absorbent portion and the central absorbent portion are formed into individual absorbent body sizes. The above object is achieved by providing a method for manufacturing an absorber characterized by the above.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below based on its preferred embodiments. First, the absorber manufactured by the method of the present embodiment will be described. The absorbent body 4 shown in FIGS. 1 and 2 is arranged between the liquid-permeable topsheet 2 and the liquid-impermeable backsheet 3 and is used as an absorbent body of the disposable diaper 1. Absorber 4
Is a central absorbent part 4 consisting of two layers of fibrous web in the central part in the direction (left-right direction in FIG. 2) orthogonal to the flow direction during manufacturing.
2 and side absorbent parts 43, 43 each composed of two layers of fiber web on both sides of the central absorbent part 42. An intermediate region 44 composed of a single layer of fiber web is provided between the central absorbent portion 42 and both side absorbent portions 43, 43.
Are formed. The central absorbent portion 42, both intermediate regions 44, and both side absorbent portions 43 are integrated by covering their peripheries with two sheets 11 and 18.

Next, a method of manufacturing the above-mentioned absorber 4 will be described. The apparatus 1 shown in FIG. 3 is an absorber manufacturing apparatus capable of continuously producing the absorber 4 described above at a high speed. As shown in FIGS. 3 and 4, the absorber manufacturing apparatus 1 continuously feeds the transport sheet 11 from the original roll and a transport mechanism (not shown) that continuously transports the transport sheet 11 continuously. The first fiber web 12 is provided on the carrying sheet 11 to be carried.
A first fiber web forming device 13 for stacking, a polymer spraying device 15 for spraying a polymer 14 on the first fiber web 12, and a folding device 16 for folding back both side portions 12a, 12a of the first fiber web 12 in the width direction. A second fibrous web forming device 13A for laminating a second fibrous web 17 on the widthwise central portion of the first fibrous web 12; and a cover sheet feeding device 19 for feeding a cover sheet 18 onto the second fibrous web 17. A pressing device 20 for pressing between the upper and lower surfaces of the obtained continuous absorber body 40, and a cutting device 21 for cutting the continuous absorber body 40 after pressing into the lengths of the individual absorbers 4 are provided.

Both fiber web forming devices 13, 13A
Respectively, defibrate the supplied raw material pulp 22 by the defibration drum 23 and scatter in the air flow, and suction and deposit the fibers on the fiber deposition surface of the fiber stacking drum 24. The first fibrous web 12 or the second fibrous web 17 is placed on the transport sheet 11 or the second fibrous web 12 laminated thereon. The fiber stacking drum 24 of the second fiber web forming apparatus 13A has a narrower fiber stacking surface than the fiber stacking drum 24 of the first fiber web forming apparatus 13.

The polymer spraying device 15 is capable of spraying the absorbent polymer 14 continuously or intermittently in a plurality of regions in the width direction of the first fiber web 12.

The folding device 16 is provided with a pressurizing means (roller and / or guide plate, etc.) 16a for pressurizing the central portion of the conveying sheet 11 in the width direction in a state where tension is applied to the sheet 11, and by this pressurization. And a guide means (roller and / or guide plate, not shown) for bending both side portions 11a, 11a of the sheet 11 standing upright on both sides of the pressed portion toward the center in the width direction of the sheet. ing. Both side portions 12a, 12a of the first fiber web 12 are
The sheet 11 for conveyance is folded back inward in the width direction together with both side portions 11a, 11a. The folding device 16
Is not limited as long as both side portions 12a, 12a of the first fiber web can be folded back in the width direction.

When the absorber manufacturing apparatus 1 is operated, the belt-shaped transport sheet 11 is continuously fed out from the original roll, and the transport sheet 11 is continuously transported. Then, as shown in FIG. 4A, the first fiber web 12 is continuously placed by the first fiber web forming device 13 on the transporting sheet 11 that is continuously transported. The transport sheet 11 is preferably paper or non-woven fabric from the viewpoints of transport stability, flexibility after being made the absorbent body 4, air permeability, and liquid permeability.

The first fiber web 12 formed on the carrying sheet 11 is further carried while being placed on the carrying sheet 11. Then, as shown in FIG. 4B, the polymer spraying device 1 is placed on the first fiber web 12.
5, the water-absorbent polymer 14 is sprayed. In the present embodiment, the water absorbent polymer 14 is intermittently provided in the region M of the predetermined width at the center of the width direction of the first fiber web 12 and the pair of regions S, S of the predetermined width located on both sides of the region M, respectively. Sprayed.

Next, as shown in FIG. 4 (c), both side portions 12a, 12a of the first fiber web 12 are folded back by the folding device 16 toward the center in the width direction. Both side portions 12a, 12a of the first fiber web 12 are
As shown, it is preferable to fold it back together with the transport sheet 11. Both sides 12a, 12a of the first fiber web 12
By folding back together with the transport sheet 11,
Even when the fiber web 12 is a fiber assembly in which fibers are not entangled or fused, the fibers can be stably folded.

By such a folding step, the first fibrous webs 12 are respectively provided on both sides in the flow direction of the transported object.
The side absorption portion 43 is formed by laminating two layers. In addition, the absorptive polymer 1 dispersed in the regions S on both sides
4 is sandwiched between the folded back first fiber webs forming the side absorbent portion 43.

Next, as shown in FIG. 4 (d), the first fiber web 1 is located on the widthwise center of the first fiber web 12, more specifically, at the center between the side absorbent parts 43.
The second fibrous web 17 is continuously placed on the second fiber 13 by the second fibrous web forming device 13A. In the present embodiment, the width of the second fibrous web 17 is made narrower than the width between the side absorbent parts 43 so that a predetermined width is provided between the inner edge of the second fibrous web 17 and each side absorbent part 43. The intermediate region 44 is formed. It is also possible to eliminate the gap between the central absorbent portion 42 and the side absorbent portions 43, 43 so that a linear bent portion is formed at the boundary between the two. By the step of laminating the second fiber web 17 as described above,
A central absorbent portion 42, in which the first fiber web 12 and the second fiber web 17 are laminated, is formed in the central portion of the transported object.
Further, the absorbent polymer 14 scattered in the region M at the center in the width direction of the first fiber web 12 is sandwiched between the second fiber web 17 and the first fiber web 12.

Then, as shown in FIG. 4 (e), the cover sheet 18 supplied by the cover sheet supply device 19 is laminated on the second fibrous web 17. The absorbent continuum 40 thus obtained is pressed between the upper and lower surfaces by a known mechanism of the pressing device 20, and then the absorbent continuum 40 after pressing is pressed by the cutting device 21 into individual absorbers. Is cut to length. It should be noted that the structure of the continuous absorber body 40 is stabilized by the pressure applied by the pressing device via the adhesive agent interposed between the desired constituent elements of the continuous absorber body 40.

According to the absorbent body manufacturing method of the present embodiment,
Since the side absorbent parts 43, 43 are formed by folding back both side parts 12a, 12a of the first fiber web 12, the gap between the side absorbent parts 43, 43 and the central absorbent part 42 changes, and the side absorbent parts 43, 43. , 43 does not cause any inconvenience such as that the fibrous webs that make up 43, 43 are turned over during transportation. Further, it is also possible to prevent the form of the side absorption portion 43 from changing. Further, the water-absorbent polymer 14 sprinkled on the side absorbent parts 43, 43 is remarkably suppressed from leaking out at the time of manufacturing or use of the absorbent article.

FIG. 1 shows the absorbent body 4 thus obtained.
Shows the state of being used as an absorber of a disposable diaper for adults. The disposable diaper shown in FIG. 1 is a so-called unfolding type diaper, and has a liquid-permeable topsheet 2,
The liquid-impermeable back sheet 3 and the liquid-retaining absorber interposed between the two sheets 2 and 3 are used, and the absorber 4 described above is used as the absorber. According to this disposable diaper, since the absorbent body 4 described above is used, the central absorbent portion 42 and the side absorbent portion 4 in the absorbent body 4 are used.
The region where the side absorbent part 43 is arranged flexibly bends between the parts 3, 43 and 43, and fits comfortably and comfortably around the legs of the wearer, and an excellent wearing feeling and leakage prevention effect are obtained. . In addition, P in the figure indicates a region in which the polymer 14 is dispersed.

In the absorbent article using the absorber 4,
It is preferable that the elastic member 7 is arranged in the region where the side absorbent portion 43 is arranged along the longitudinal direction thereof, because the fit property with respect to the legs and the leakproof effect can be improved. That is, in the absorber manufacturing method of the present invention,
The method comprises a step of disposing the absorber continuous body 40 or the absorber 4 between the liquid-permeable topsheet 2 and the liquid-impermeable backsheet 3, and in the step, the topsheet 2 or the backsheet 3 It is preferable to dispose the elastic member 7 between the side absorbing portion 43 and the side absorbing portion 43. When the elastic member is arranged in the intermediate region 44, wrinkles may be generated in the central absorption portion 42 due to the contracting force, and wrinkles may promote liquid leakage such as urine and menstrual blood.

The material for forming the above-mentioned absorber 4 will be described. As the material for forming the first and second fibrous webs 12 and 17, the fibrous material conventionally used for the absorbent body of disposable absorbent articles such as disposable diapers and sanitary napkins can be used without particular limitation. Pulp fibers, cellulosic fibers such as cotton and rayon, synthetic fibers and composite fibers such as polyethylene, polypropylene and polyester, and a mixture of a plurality of types of fibers can be mentioned. The materials for forming the first and second fibrous webs 12 and 17 may be the same or different, and the first and second fibrous webs 12 and 17 may include a coloring agent and an absorbent polymer other than the fibrous material, respectively. Etc. may be blended.

As the conveying sheet 11 and the cover sheet 18, various sheet materials conventionally used in the absorber can be used without particular limitation, and examples thereof include paper and non-woven fabric. As the water-absorbent polymer 14, those conventionally used in the absorbent body of the disposable absorbent article can be used without any particular limitation.
Those capable of absorbing / holding 0 times or more liquid and gelling are preferable. For example, starch, crosslinked carboxymethyl cellulose, polymer or copolymer of acrylic acid or alkali metal acrylate, polyacrylic acid and the like. Mention may be made of salts as well as polyacrylate graft polymers.

Examples of materials for forming the elastic member 7 include natural rubber, synthetic rubber, spandex, and the like.
Examples of each form include a thread form, a band form, and a film form. The elastic member is preferably a rubber thread or a flat rubber from the viewpoints of shrinkability around the legs, workability, cost, and the like.

The present invention is not limited to the above-mentioned embodiment, and can be appropriately modified within a range not departing from the gist of the present invention. For example, in the above-described embodiment, the laminating step of the second fiber web is performed after the folding step, but the order of both steps may be reversed and the folding step may be performed after the laminating step of the second fiber web. Specifically, after the steps shown in FIGS. 4A and 4B, after laminating the second fiber web 17 on the widthwise central portion of the first fiber web 12 and further laminating the cover sheet 18. Both side portions 12a, 12a of the first fiber web 12 may be folded back. FIG. 5 shows an example of the absorber obtained in this case. According to such an embodiment, the same effect as that of the above embodiment can be obtained.

Further, as shown in FIG. 6, the first fiber web 1
2, a through hole 12b having a predetermined shape is formed inside the portion where the both side portions 12a, 12a are laminated.
The through hole 1 is formed between the fibrous web 17 and both side edges of the folded back side portions 12a, 12a of the first fibrous web 12.
It is also possible to stack so as to form a gap that overlaps with 2b. According to this method, the central absorption portion 4 at the central portion in the longitudinal direction is
It is possible to manufacture the absorbent body in which the fibrous web does not exist in the intermediate region 44 between the two and the side absorbent portions 43, 43. Further, the second fiber web 17 is the first fiber web 1
It may be intermittently placed on the second unit.

The shape and size of each part of the absorber according to the present invention,
For example, the widths of the central absorbent portion 42, both side absorbent portions 43, and the intermediate region 44 are appropriately determined according to the usage of the absorbent body, the target person (whether it is for adults or children, etc.), and the like. can do. Further, the water-absorbent polymer may be dispersed so as to cover the entire area of the individual absorbers 4 in the longitudinal direction.

The absorbent body according to the present invention is preferably used as an absorbent body of a disposable absorbent article used for treating excretory liquid such as urine and menstrual blood such as incontinence pads, sanitary napkins, etc., particularly as an absorbent body of disposable diapers. .

[0026]

According to the method of manufacturing an absorbent body of the present invention, an absorbent body having a central absorbent section and side absorbent sections located on both sides of the central absorbent section can be stably and continuously produced at high speed.
Polymer leakage does not occur even when the side absorbent portion contains a water-absorbent polymer.

[Brief description of drawings]

FIG. 1 shows a state in which the absorbent body manufactured by the method of the present invention is used as an absorbent body of a disposable diaper for adults.

FIG. 2 is a schematic cross-sectional view showing a cross section in the width direction at the central portion in the longitudinal direction of the absorbent body shown in FIG.

FIG. 3 is a schematic view showing an example of an apparatus for carrying out the absorbent body manufacturing method of the present invention.

FIG. 4 is a process diagram showing a schematic form of the transported object at each stage of the absorber manufacturing process, and FIG.
(E) sequentially shows the transported objects at the portions indicated by arrows A to E in FIG.

FIG. 5 is a view showing another embodiment of the present invention (FIG. 2).
It is a correspondence diagram).

FIG. 6 is a diagram showing still another embodiment of the present invention, FIG. 6 (a) is a diagram corresponding to FIG. 4 (b), and FIG. 6 (c) is a diagram corresponding to FIG.

[Explanation of symbols]

1 Disposable diapers (disposable absorbent articles) 2 Top sheet 3 back sheet 4 absorber 42 Central absorption part 43 Side absorption part 44 Intermediate area 11 Transport sheet 12 First fiber web 12a Side of first fibrous web 14 Water-absorbent polymer 17 Second fiber web 18 cover sheet

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yasuhiro Onizawa             Kao Stock Exchange 2606, Akabane, Kai-cho, Haga-gun, Tochigi Prefecture             Company research institute (72) Inventor Hiroshi Inada             Kao Stock Exchange 2606, Akabane, Kai-cho, Haga-gun, Tochigi Prefecture             Company research institute F-term (reference) 3B029 BF02                 4C098 AA09 CC03 CC10 CC11 DD01                       DD02 DD06 DD10 DD22 DD23                       DD25 DD26 DD27

Claims (5)

[Claims] 1. A method for manufacturing an absorbent body, which continuously produces an absorbent body having a central absorbent section and side absorbent sections located on both sides of the central absorbent section, wherein both side sections of a belt-shaped first fibrous web are continuously conveyed. Each of which is folded back in the width direction to form a side absorbent portion composed of two layers of the fibrous web, the second fibrous web is laminated on the widthwise central portion of the first fibrous web, A step of forming the central absorbent part, and a step of cutting the absorber continuous body on which the side absorbent part and the central absorbent part are formed into individual absorber sizes. Production method. 2. Before the folding step, an absorbent polymer is sprinkled on a portion of the first fibrous web where the both side portions are laminated, and in the folding step, both side portions of the first fibrous web are covered with the absorbent polymer. The method for producing an absorbent body according to claim 1, wherein the absorbent article is folded back so as to sandwich the polymer. 3. Prior to the step of laminating the second fibrous web,
A method in which an absorptive polymer is sprinkled on the central portion in the width direction of the first fibrous web, and in the step of laminating the second fibrous web, the sprinkling region of the absorptive polymer is sandwiched between the second fibrous web and the first fibrous web. 1. The method for producing the absorber according to 1 or 2. 4. The first fibrous web is conveyed while being placed on a conveying sheet, and both side portions of the first fibrous web are folded back together with the conveying sheet in the folding step. A method for producing the absorbent body described. 5. A step of disposing the absorber continuum or the absorber between a liquid-permeable topsheet and a liquid-impermeable backsheet, wherein the topsheet or the backsheet is provided. The method for manufacturing an absorbent body according to claim 1, wherein an elastic member is arranged between the sheet and the side absorbent portion.