JP2008206539A - Manufacturing method of absorbent body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of an absorbent body efficiently and economically manufacturing absorbent bodies having a leakage prevention wall with a superior formation property (erection property). <P>SOLUTION: This manufacturing method of the absorbent body is provided with steps for suckingly piling raw materials 22 and 23 supplied toward the outer circumferential face in a dispersed state and forming an absorbent core on a core wrap sheet 3 supplied on the outer circumferential face of fiber-laminated drum 6, covering a side opposite to the first core wrap sheet side of the absorbent core with a second core wrap sheet 4, and guiding out the acquired absorbent continuous body 10 from the outer circumferential face of the fiber-laminated drum 6. This method previously fixes elastic members 5 and 5 on the second core wrap sheet 4 supplied on the fiber-laminated drum 6 in extended state to manufacture the absorbent body. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing an absorbent body.

Conventionally, as an absorbent article such as a disposable diaper, both side portions of the absorbent body in the longitudinal direction are raised toward the wearer's skin using the contraction force of the elastic member, and the movement of the liquid to the side is suppressed. What is made to function as a leak-proof wall (three-dimensional barrier) is known.
In addition, as a conventional manufacturing method of the absorbent body, a first core wrap sheet made of thin paper with clogs is supplied on the outer peripheral surface of the stacking drum, and the fiber material and the like supplied in a scattered state on the sheet An absorbent core is formed by depositing raw materials by suction to form an absorbent core, and the upper and lower surfaces of the absorbent core are covered with the first core wrap sheet or the first core wrap sheet and the second core wrap sheet. There is known a method for continuously producing an absorbent body obtained by cutting it into a predetermined length to obtain an absorbent body (see, for example, Patent Document 1).

JP 2001-171029 A

  However, in a conventional absorbent article in which a leak-proof wall (three-dimensional barrier) is formed by an elastic member, after the elastic member that raises a part of the absorbent body covers the upper and lower surfaces of the absorbent core with a core wrap sheet Since it was introduced to the production line in a state of being fixed to another sheet material such as a surface sheet, a separate sheet material such as a surface sheet is required, and the surface sheet or the like or to join it to another member Due to the rigidity of the adhesive, etc., the elastic member is prevented from contracting. As a result, the standing property of the leak-proof wall (three-dimensional barrier) becomes insufficient, or a thicker elastic member is required to improve the standing property. There was a problem of becoming.

  Therefore, the objective of this invention is providing the manufacturing method of an absorber which can manufacture efficiently and economically the absorber excellent in the formation property (standing property) of a leak-proof wall.

  In the present invention, the absorbent core is formed by sucking and depositing the raw material supplied in a scattered state toward the outer peripheral surface on the first core wrap sheet supplied on the outer peripheral surface of the stacking drum. A method of manufacturing an absorbent body comprising a step of covering the surface of the core opposite to the first core wrap sheet side with a second core wrap sheet and then deriving the resulting absorbent continuous body from the outer peripheral surface. The above object is achieved by providing an absorbent body manufacturing method in which an elastic member is fixed in advance in a stretched state on a second core wrap sheet to be supplied onto the stacking drum. Yes (hereinafter referred to as the first invention).

  In the present invention, the absorbent core is formed by sucking and depositing the raw material supplied in a scattered state toward the outer peripheral surface on the first core wrap sheet supplied on the outer peripheral surface of the stacking drum. After covering the surface of the core opposite to the first core wrap sheet with the portion of the first core wrap sheet that is folded back to the surface or the second core wrap sheet, It is a manufacturing method of an absorber which comprises the process led out from the field, and an absorber which fixes an elastic member beforehand in the state of extension on the 1st core wrap sheet supplied on the stacking drum, and manufactures an absorber The above object is achieved by providing the manufacturing method (hereinafter referred to as the second invention).

  According to the method for producing an absorbent body of the present invention, an absorbent body excellent in the formation of a leak-proof wall (standing upright) can be produced efficiently and economically.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.
First, the absorber manufactured by one embodiment of the present invention (first and second inventions) will be described.
The absorber 1 shown in FIG.1 and FIG.2 is an example of the absorber manufactured by one embodiment of this invention (1st and 2nd invention), and is used as an absorber of a disposable diaper.
The absorbent body 1 is disposed along the absorbent core 2, the first core wrap sheet 3 and the second core wrap sheet 4 that cover both surfaces of the absorbent core 2, and both longitudinal edges of the absorbent body 1. And elastic members 5 and 5.
The absorptive core 2 consists of particles of fiber material and superabsorbent polymer. As the fiber material and the superabsorbent polymer, those conventionally used when producing the absorbent core by sucking and depositing the scattered raw materials can be used without any particular limitation. Cellulose fibers such as pulp fiber and rayon are preferably used. Examples of the superabsorbent polymer include sodium polyacrylate, allylic acid-vinyl alcohol copolymer, crosslinked polyacrylate sodium, starch-allylic acid graft copolymer. Examples thereof include a polymer, an isobutylene-maleic anhydride copolymer and a saponified product thereof, and polyaspartic acid.

  In the present embodiment, the first and second core wrap sheets 3 and 4 are both non-woven fabrics. As the first and second core wrap sheets, paper such as tissue paper can be used in the same manner as in the conventional method for producing an absorbent body, but in particular, the first core wrap sheet covering the suction surface uses a non-woven fabric. It is preferable. Examples of the nonwoven fabric used as the core wrap sheet include a spunbond nonwoven fabric, an SMS (spunbond-meltblown-spunbond) nonwoven fabric, an airlaid nonwoven fabric, a heat-sealed nonwoven fabric, and an air-through nonwoven fabric. Among these, the air permeability of the nonwoven fabric, From the viewpoint of strength and clogging of eyes, spunbonded nonwoven fabric and SMS are preferable.

In addition, as the first and second core wrap sheets 3 and 4, the laminated upper layer sheet and lower layer sheet are partially joined to form a large number of joined portions, and one layer is on the other side of the joined portion. It is also possible to use a non-woven fabric having a two-layer structure in which a large number of convex portions are formed protruding on the surface side. As an example of such a nonwoven fabric, the thing of the structure similar to the surface sheet of Unexamined-Japanese-Patent No. 2004-174234 can be used, for example.
The absorbent body 1 shown in FIG. 1 is a surface in which the surface on the first core wrap sheet 3 side is directed toward the wearer's skin when wearing a diaper (absorbent article). The fact that the surface side directed to the skin side is composed of a non-woven fabric has an advantage that a good touch can be obtained without arranging another sheet made of non-woven fabric as a top sheet on the first core wrap sheet 3. In particular, when a non-woven fabric having a two-layer structure having a convex portion on one side is used, the convex portion can be formed because it can reduce the contact area between the skin and the non-woven fabric and create a space that can flow between the skin and the non-woven fabric. It is preferable that the surface side having a surface is a surface directed toward the skin side.

As shown in FIG. 1 and FIG. 2, the absorbent core 1 has an absorbent core 2 positioned at the center in the width direction and at both sides of the center piece 2 </ b> M. It is divided into side pieces 2S and 2S. More specifically, a central region A1 disposed in the crotch part of the diaper when incorporated in a disposable diaper is divided into a central piece 2M and side pieces 2S, 2S.
The pair of elastic members 5 and 5 are arranged in the vicinity of both side edges in the longitudinal direction of the absorbent body 1 so as to extend along both side edges. The elastic members 5 and 5 are respectively disposed between the first core wrap sheet 3 and the second core wrap sheet 4 and are stretched by an adhesive (not shown) on at least one of the sheets 3 and 4. It is fixed with.

As shown in FIG. 1, the absorbent body 1 rises toward the skin side of the wearer of a disposable diaper (also in the case of other absorbent articles) due to the contraction of the elastic members 5, 5, Both side portions that have risen function as leak-proof walls (three-dimensional barriers) that suppress lateral movement of the liquid supplied (excreted) on the absorber 1.
The first core wrap sheet 3 and the absorbent core 2 and the second core wrap sheet 4 and the absorbent core 2 are joined by an adhesive coated in a spiral shape. In the part where the absorbent core 2 does not exist between the 1 core wrap sheet 3 and the second core wrap sheet 4, both the core wrap sheets 3 and 4 are joined together by the same coated adhesive.

Next, an embodiment (also referred to as a first embodiment) of the first invention will be described with reference to FIGS. In the first embodiment, the absorber 1 having the above-described configuration is manufactured using the absorber manufacturing apparatus shown in FIGS. 3 and 4.
The absorber manufacturing apparatus shown in FIGS. 3 and 4 includes a fiber pile drum 6 and a duct 7, and the duct 7 has one end portion that covers a part of the outer peripheral surface of the fiber pile drum 6. The raw materials 22 and 23 of the absorbent body in a scattered state are supplied to the outer peripheral surface of the stacking drum 6.

  The pile drum 6 has a cylindrical shape and is driven to rotate in the direction of arrow A in FIG. On the outer peripheral surface of the stacking drum 6, accumulation concave portions 61, 61... Having a shape corresponding to the shape of the absorbent core 2 to be manufactured are formed. An intake fan (not shown) is connected to the pile drum 6, and the partitioned spaces B and C in the pile drum are maintained at a negative pressure by driving the intake fan. Yes. A large number of pores (not shown) are formed in the bottom surface of each accumulation recess 6, while the accumulation recess 6 passes over the spaces B and C maintained at negative pressure. The pores at the bottom of the concave portion for accumulation function as suction holes.

  A fiber material supply device (not shown) that supplies the fiber material 22 such as pulp fiber in a scattered state in the duct 7 is provided near the end of the duct 7 opposite to the fiber drum 6 side. Yes. Further, a polymer introduction port 71 for introducing the highly water-absorbing polymer particles 23 into the duct 7 is provided between the fiber drum 6 and the introduction portion of the fiber material in the duct 7.

  In the first embodiment, as shown in FIG. 3, the first core wrap sheet 3 is supplied onto the outer peripheral surface of the stacking drum 6, and the first core wrap sheet 3 is covered with the duct 7 by the rotation of the drum 6. In this portion, the fiber material 22 and the superabsorbent polymer particles 23 are sucked and deposited on the first core wrap sheet 3. More specifically, the fiber material 22 and the superabsorbent polymer particles 23 are deposited on the concave portion of the first core wrap sheet 3 that has been deformed so as to conform to the shape of the inner surface of the accumulation recess 6. The fibrous core 22 and the superabsorbent polymer particles 23 are deposited to form the absorbent core 2 having substantially the same shape as the accumulation recess 6.

In the present embodiment, the second core wrap sheet 4 is laminated on the absorbent core 2 immediately after moving from the portion covered with the duct 7 to the outside of the duct 7. The second core wrap sheet 4 covers the surface of the absorbent core 2 opposite to the first core wrap sheet 3 side, and as a result, between the first core wrap sheet 3 and the second core wrap sheet 4. The absorbent continuous body 10 having a configuration in which the absorbent core 2 is interposed therebetween is obtained. And the absorber continuous body 10 moves on the space D made into the positive pressure in a fiber drum, is transferred to the belt conveyor 8 on this space D, and is conveyed to the following process. .
The absorbent body continuum 10 transported to the next step is made into a single state or a state of being incorporated into a diaper continuous body, and then cut into a length corresponding to one diaper to form individual absorbent bodies 1. .

  In the first embodiment, as shown in FIGS. 3 and 4, the elastic members 5 and 5 are fixed in advance in a stretched state on the second core wrap sheet 4 supplied onto the fiber pile drum 6. More specifically, as shown in FIG. 4, two elastic members 5 are separated and fixed to the second core wrap sheet 4 so as to extend in the same direction as the flow direction E of the sheet 4. The elastic members 5 and 5 in this embodiment are elastic on both side edges of the absorbent core 2 when the second core wrap sheet 4 is laminated on the first core wrap sheet 3 on which the absorbent core 2 is formed. The members 5 are introduced so as to be located close to each other.

In FIG. 3, reference numeral 9 </ b> A is an adhesive application device for applying an adhesive for bonding the elastic member 5 and the second core wrap sheet 4 in a spiral shape, a dot shape, or a surface shape, Reference numeral 9 </ b> B is an adhesive application device for applying an adhesive for bonding the first core wrap sheet 3 and the absorbent core 2 to the first core wrap sheet 3.
The elastic member 5 can be fixed to the second core wrap sheet 4 by applying an adhesive to the second core wrap sheet 4 and joining the elastic member 5 immediately before winding on the stacking drum (before the roll). preferable.
The elastic member 5 may be fixed in a non-extended state, but is preferably fixed to the second core wrap sheet 4 in a state where the elastic member 5 is extended to a length of 1.5 to 4.0 times.

According to the manufacturing method of the first embodiment, the absorber 1 having the above-described configuration can be continuously produced efficiently and economically in this way.
In the absorbent body 1, the elastic members 5 and 5 are fixed to the first and second core wrap sheets 3 and 4, and are not fixed to another sheet material such as a surface sheet laminated on the absorbent body 1. The elastic members 5 and 5 contract well and are excellent in the formability (standing upright) of the leak-proof wall (three-dimensional barrier). In addition, since it is not necessary to use another sheet material such as a surface sheet in order to introduce the elastic members 5 and 5, the use of such a sheet material can be omitted, and for improving the standing property. In addition, a thick elastic member is not required. Therefore, the absorber 1 can be manufactured economically.

  According to the manufacturing method of the first embodiment, regular wrinkles or the like are likely to occur in the first core wrap sheet 3. For this reason, a material having a high frictional resistance with the nonwoven fabric is installed on the drum side on the outer peripheral surface of the fiber stacking drum 6 on the drum side, or suction holes are installed and a certain tension is applied to the nonwoven fabric in the lateral direction. This problem can be solved.

Next, an embodiment of the second invention (hereinafter also referred to as a second embodiment) will be described with reference to FIGS. In 2nd Embodiment, the absorber 1 of a structure as mentioned above is manufactured using the manufacturing apparatus of the absorber shown in FIG.5 and FIG.6.
The second embodiment will be described with respect to differences from the first embodiment described above, and the same points will be denoted by the same reference numerals and description thereof will be omitted. Points that are not particularly described are the same as in the first embodiment.

In the second embodiment, as shown in FIGS. 5 and 6, the elastic members 5 and 5 are fixed in advance in a stretched state on the first core wrap sheet 3 to be supplied onto the stacking drum 6. More specifically, as shown in FIG. 6, two elastic members 5 are separated and fixed to the first core wrap sheet 3 so as to extend in the same direction as the flow direction F of the sheet 3. In the present embodiment, the elastic members 5 and 5 are positioned so that the elastic members 5 are adjacent to both side edges of the absorbent core 2 when the absorbent core 2 is formed on the first core wrap sheet 3. Has been introduced.
In FIG. 5, reference numeral 9 </ b> A denotes an adhesive application device for applying an adhesive for bonding the second core wrap sheet 4 and the first core wrap sheet 3 in a planar shape, a spiral shape, or a dot shape. Reference numeral 9B denotes an adhesive application device for applying an adhesive for adhering the first core wrap sheet 3 and the elastic member 5 to the first core wrap sheet.
In addition, the elastic member 5 is fixed to the first core wrap sheet 3 by applying the adhesive of the first core wrap sheet 3 immediately before being wound around the stacking drum (before the roll) and joined with the elastic member 5. It is preferable.

According to the manufacturing method of the second embodiment, the same effects as those of the first embodiment can be obtained.
Furthermore, in the manufacturing method according to the second embodiment, when the fiber material 22 and the superabsorbent polymer particles 23 are sucked and deposited on the first core wrap sheet 3, the elastic members 5 and 5 make the first The core wrap sheet 3 is pressed against the outer circumferential surface of the stacking drum 6 other than the accumulation recess 61, and irregular wrinkles and the like are less likely to occur on the sheet 3. Therefore, the surface of the absorber cannot be uneven, and the mixing property of the fiber material 22 and the highly water-absorbing polymer particles 23 is improved, so that the absorption performance is not shaken by the absorber core, and the targeted performance can be exhibited.

FIG. 7 is a view showing an absorbent body manufactured according to still another embodiment of the present invention.
In the first embodiment, the absorbent body shown in FIG. 7 (a) is formed by covering the absorbent core 2 with the second core wrap sheet 4 narrower than the first core wrap sheet 3, and then both side edges of the sheet 4. A part of the sheet 3 that extends further is obtained by folding back and bonding to the second core wrap sheet 4 side.
In the second embodiment, the absorbent body shown in FIG. 7 (b) is formed by covering the absorbent core 2 with the second core wrap sheet 4 wider than the first core wrap sheet 3, and then from both side edges of the sheet 3. A part of the sheet 4 that extends is folded and adhered to the first core wrap sheet 3 side.
The absorber shown in FIG.7 (c) forms the absorptive core 2 which has the center piece 2M and does not have the side piece 2S, 2S in the 1st and 2nd embodiment, and is 1st or 2nd core wrap sheet | seat The elastic members 5 and 5 are obtained by introducing the elastic members 5 and 5 at positions separated from the central piece 2M by a predetermined distance in the width direction.

  In the second invention, as in the first embodiment described above, instead of covering the opposite surface of the absorbent core 2 formed on the first core wrap sheet 3 with the second core wrap sheet 4, For example, as shown in FIG. 8, the first core wrap sheet 3 having a width that is twice or more the entire width of the absorbent core 2 is used, and the absorbent core 2 formed on the first core wrap sheet 3 is used. The opposite surface 2T may be covered with a portion of the first core wrap sheet that is folded back toward the surface 2T.

Furthermore, as shown in FIG. 9, as the first core wrap sheet 3, a non-woven fabric 3 </ b> A having a water-repellent region 3 </ b> M and hydrophilic regions 3 </ b> S and 3 </ b> S is used. A part of the entire region and the vicinity of both side edges 25, 26 of the core on the skin contact surface 2T side is covered with a water-repellent region 3M, and a central region of the skin contact surface 2T of the absorbent core 2 is a hydrophilic region Absorbers coated with 3S and 3S can also be manufactured.
By using a non-woven fabric having a water-repellent region and a hydrophilic region as the first core wrap sheet 3, an absorbent body having both excellent leakage prevention properties and excellent absorption properties can be easily obtained. A nonwoven fabric having a water-repellent region and a hydrophilic region is made of hydrophilic fibers such as pulp fibers and rayon fibers, even if the nonwoven fabric made of water-repellent synthetic fibers is partially hydrophilized. It may be obtained by making a part of the nonwoven fabric water repellent. As processing agents used for hydrophilization or water repellency, various known ones can be appropriately selected and used.

When a non-woven fabric having a water repellent region and a hydrophilic region is used as the first core wrap sheet 3, the distribution pattern of the water repellent region and the hydrophilic region is not limited to the embodiment shown in FIG. It can be.
For example, FIG. 9 shows the position of the first core wrap sheet 3 in the absorbent body shown in FIG. 8 from the position of P1 on the non-skin contact surface 2B side to the positions of the side edges 25, 26 of the absorbent core 4 (elastic member 5). Is the water repellent region 3M up to the position of P2 on the skin contact surface 2T side, but instead of this, the first core wrap sheet 3 in the absorbent body shown in FIG. The water repellent region 3M from the position of P1 to the position of P3 through the positions of the side edge portions 25 and 26 of the absorbent core 4 can also be set, and further, from the position of P1 on the non-skin contact surface 2B side to P4. The water repellent region 3M can be made up to the position of, and the portion outside P4 on the non-skin contact surface 2B side and the entire region of the skin contact surface 2T can be made hydrophilic.
In addition, the center piece 2M and side piece 2S, 2S of the absorptive core in FIG. 9 are located on the hydrophilic area | region 3M.

  In the second invention, another surface 2T on the opposite side of the absorbent core 2 formed on the first core wrap sheet 3 is covered with a portion folded back to the surface 2T side of the first core wrap sheet. As an example, the case shown in FIGS. 10 and 11 can be given.

In the absorbent body shown in FIG. 10, as shown in FIG. 11, the width of the part extending from one side edge 25 of the absorbent core 2 is larger than the part extending from the other side edge 26. Thus, the absorbent core 2 is formed so that the skin contact surface 2T of the absorbent core 2 is covered with portions extending from both side edges of the core 2.
Also in this case, for example, by using the nonwoven fabric 3B in which the water-repellent region 3M and the hydrophilic region 3S are formed in the pattern shown in FIG. A part of the core near both side edges 25.26 on the contact surface 2T side is covered with a water-repellent region 3M, and a central region of the skin contact surface 2T of the absorbent core 2 is covered with a hydrophilic region 3S. An absorbent body can also be produced.

  The absorbent body produced in the present invention is preferably used as an absorbent body for absorbent articles. The absorbent article is mainly used for absorbing and holding excretory body fluids such as urine and menstrual blood. Absorbent articles include, for example, disposable diapers, sanitary napkins, incontinence pads, and the like, but are not limited to these, and widely include articles used to absorb liquid discharged from the human body.

The absorbent article typically includes a top sheet, a back sheet, and a liquid-retaining absorbent disposed between the two sheets. The absorbent manufactured in the present invention is a first core wrap. The sheet or the second core wrap sheet can also serve as the surface sheet. As the back sheet, materials usually used in the technical field can be used without particular limitation.
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 disposable diaper or a sanitary napkin, a pair or two or more pairs of three-dimensional guards can be disposed on the outer side of both side portions where the absorbent body stands.
The form of the elastic member 5 is preferably a thread-like member (thread rubber or the like), a belt-like member having a predetermined width (flat rubber or the like), and particularly preferably a thread-like member. Examples of the material of the elastic member 5 include natural rubber, synthetic rubber such as styrene-butadiene, butadiene, isoprene, and neoprene, EVA, stretchable polyolefin, urethane, and the like.

While the present invention has been described with reference to several embodiments, the present invention is not limited to the above-described embodiments and can be modified as appropriate.
For example, the direction of the elastic member 5 fixed to the first core wrap sheet or the second core wrap sheet and supplied to the stacking drum 6 is a direction orthogonal to the flow direction of each sheet, instead of the flow direction of each sheet. There may be. The absorbent body 1B in the disposable diaper shown in FIG. 12 is spaced from the sheet 3 so that a large number of elastic members 5, 5... Are oriented in a direction perpendicular to the flow direction of the first core wrap sheet 3. Are opened and fixed sequentially, and the first core wrap sheet 3 is supplied onto the stacking drum 6 to form a large number of absorbent cores 2A, 2A,. It is obtained by covering with the core wrap sheet 4 to obtain an absorbent body continuous body, and cutting the absorbent body continuous body into a predetermined length.
In the absorbent body 1B in the disposable diaper shown in FIG. 12, each of the absorbent cores 2A, 2A · is raised as shown in FIG. 12 (b) by the contraction force of the elastic members 5 arranged adjacent to each other. Thus, a leak-proof wall extending in the width direction of the diaper is formed in a multi-stage shape on the absorbent body 1B.
In the absorbent body 1B shown in FIG. 12, the arrangement of the elastic member 5 and the absorbent core 2A is reversed between the part B1 arranged on the wearer's belly side and the part C1 arranged on the back side. The direction in which the leakage wall stands is different. In the absorbent body 1C shown in FIG. 13, the part B1 disposed on the wearer's abdomen side and the part C1 disposed on the back side have the same direction in which the leak-proof wall stands, and otherwise the absorbent body The same as 1B.

Further, the elastic member 5 that is fixed to the first core wrap sheet or the second core wrap sheet and supplied to the stacking drum 6 includes a portion 51 that is substantially parallel to the flow direction of each sheet and the flow as shown in FIG. It can also be fixed to each sheet so as to have a portion 52 substantially parallel to the direction orthogonal to the direction.
In the absorbent body shown in FIG. 14, an absorbent core having front and rear pieces 2F and 2R on the front and rear sides of the center piece 2M and left and right pieces 2S and 2S is formed on the left and right sides, and the front and rear pieces 2F and 2R surrounding the center piece 2M. And the left and right pieces 2S, 2S stand by the contraction of the elastic member 5, and it is possible to obtain an absorber that hardly leaks from the front, rear, left, and right.

When the fiber material 22 and the superabsorbent polymer particles 23 are deposited on the first core wrap sheet 3, the superabsorbent polymer having a larger particle size is deposited before the smaller particle size. It is preferable to do. The particle diameter is the diameter of a sphere when the superabsorbent polymer particles are spherical, and when the polymer particles are not spherical, the average value of the minor axis and the major axis is the average of the particles. The particle size. By depositing the superabsorbent polymer having a large particle size first, the polymer is difficult to pass even if a non-woven fabric having a coarse mesh is used as the first core wrap sheet.
In order to deposit the superabsorbent polymer having a large particle size first, for example, as shown in FIG. 15, a pair of polymer inlets 71 are provided at two locations on both sides of the upper portion of the duct 7. Convex portions 73, 73 for forming turbulent airflow are formed at intermediate portions in the height direction of the two opposite side surfaces 72, 72, and polymer particles 23 having two sharp particle size distribution peaks from each of the polymer inlet ports 71 described above. Is introduced into the duct 7.
Since the introduced polymer particles fall faster as the particle diameter becomes larger, the polymer particles having a larger particle diameter are larger than the space where the turbulent air flow is not generated in the duct 7, that is, the position where the members 73 and 73 are provided. Conveyed in the lower space and deposited in the rotating accumulation recess 61 at an early stage, while the polymer particles having a small particle size are swirled by turbulence and are later than the polymer particles having a large particle size. In this way, it accumulates in the accumulation recess 61.

Such polymer particles 23 having two sharp particle size distribution peaks can be obtained by mixing two types of polymer particles 23 having monodispersed particle size distributions each having a different average particle size. In this case, two types of polymer particles 23 having different characteristics can be used.
Further, by classifying the polymer particles 23 having a single peak particle size distribution, it is also possible to obtain a portion having a desired particle size of a large particle size and a small particle size. In this case, it is possible to obtain two particle sizes having significantly different physical properties in one kind of polymer particles 3.

In the present invention, as the raw material for the absorbent core, instead of supplying the fiber material and the superabsorbent polymer particles in a scattered state, only the fiber material may be supplied in a scattered state. For example, although there is no particular limitation, when manufacturing an absorbent article of an absorbent article with relatively less excrement, such as a light incontinence pad, a urine pad, and a sanitary napkin, it can be supplied only with a fiber material. .
Moreover, when manufacturing what the center area | region A1 of an absorber is divided | segmented into the center piece 2M and the side piece 2S, 2S as the absorptive core 2, the side piece 2S, 2S is the longitudinal direction of an absorber. It may be continuous with the central piece 2M at the front end and / or rear end in the direction. Moreover, although it is preferable that the clearances 21 and 21 of predetermined width (for example, 1-3 mm) are formed between the center piece 2M and the side piece 2S, 2S, both may be closely_contact | adhered.

FIG. 1 is a cross-sectional view (a cross-sectional view taken along the line II-II in FIG. 2) showing an example of an absorbent body manufactured according to an embodiment of the present invention (first and second inventions). FIG. 2 is a partially broken plan view showing an example of an absorbent body manufactured according to an embodiment of the present invention (first and second inventions). It is a schematic cross section (III-III sectional view taken on the line of FIG. 4) which shows one embodiment of this invention (1st invention), and the manufacturing apparatus of the absorber used therefor. It is a schematic diagram which shows one embodiment of this invention (1st invention) and the manufacturing apparatus of the absorber used there, and is the figure which looked at the outer peripheral surface of the piled drum from the duct direction. It is a schematic cross section (IV-IV sectional view taken on the line of FIG. 4) which shows one embodiment of this invention (2nd invention) and the manufacturing apparatus of the absorber used therefor. It is a schematic diagram which shows one embodiment of this invention (1st invention) and the manufacturing apparatus of the absorber used there, and is the figure which looked at the outer peripheral surface of the piled drum from the duct direction. It is sectional drawing which shows the absorber manufactured by the further another embodiment of this invention, and is a figure which shows a part of cross section corresponding to FIG. It is sectional drawing which shows the absorber manufactured by other embodiment of this invention (FIG. 1 equivalent view). It is a schematic plan view which shows the 1st core wrap sheet in the further another embodiment of this invention. It is sectional drawing which shows the absorber manufactured by other embodiment of this invention (FIG. 1 equivalent view). It is a schematic plan view which shows the 1st core wrap sheet in the further another embodiment of this invention. It is a figure which shows the absorber manufactured by the further another embodiment of this invention, and the disposable diaper incorporating this absorber, FIG.12 (a) is a schematic top view which shows a disposable diaper, FIG.11 (b) is FIG. It is the VV sectional view taken on the line of Fig.12 (a). It is a figure which shows the absorber manufactured by other embodiment of this invention, Fig.13 (a) is a schematic plan view, FIG.13 (b) is the VI-VI sectional view taken on the line of Fig.13 (a). It is. It is explanatory drawing for demonstrating other embodiment of this invention. It is a perspective view which shows the duct used in the preferable embodiment of this invention.

Explanation of symbols

1, 1B, 1C Absorber 2 Absorbent Core 3 First Core Wrap Sheet 4 Second Core Wrap Sheet 5 Elastic Member 6 Stacking Drum 7 Duct 10 Absorber Continuum

Claims (4)

On the first core wrap sheet supplied on the outer peripheral surface of the stacking drum, the raw material supplied in a scattered state toward the outer peripheral surface is suction-deposited to form an absorbent core, and the first of the absorbent core After covering the surface opposite to the core wrap sheet side with the second core wrap sheet, a method for producing an absorbent body comprising a step of deriving the obtained absorbent continuum from the outer peripheral surface,
The manufacturing method of the absorber which manufactures an absorber by fixing an elastic member beforehand in the expansion | extension state on the 2nd core wrap sheet | seat supplied on the said fiber drum. On the first core wrap sheet supplied on the outer peripheral surface of the stacking drum, the raw material supplied in a scattered state toward the outer peripheral surface is suction-deposited to form an absorbent core, and the first of the absorbent core After the surface opposite to the core wrap sheet side is covered with the portion of the first core wrap sheet folded back to the surface side or the second core wrap sheet, the resulting absorbent continuous body is derived from the outer peripheral surface. A method for producing an absorbent body comprising a step of:
The manufacturing method of the absorber which manufactures an absorber by fixing an elastic member beforehand in the expansion | extension state on the 1st core wrap sheet | seat supplied on the said fiber drum.   The manufacturing method of the absorber of Claim 1 or 2 in which a 1st core wrap sheet | seat consists of a nonwoven fabric.   The elastic member is spaced apart and fixed to the first core wrap sheet or the second core wrap sheet so as to extend in the same direction as the flow direction of each sheet, and the elastic member is provided on each of both sides in the longitudinal direction of the absorbent body. The manufacturing method of the absorber of Claim 1 or 2 which manufactures the absorber of the structure fixed.

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