JP2016112359A - Producing method of absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a producing method of an absorber comprising a jointing part between core wrap sheets on a non-fabric part, with which an absorber having excellent shape retention property of absorbing core and in which tear of the core wrap sheet and leakage of an adhesive agent hardly occur upon production.SOLUTION: There is provided a method for producing an absorber comprising an absorbing core 11 and core wrap sheets 15, in which upper and lower core wrap sheets are jointed via a non-fabric part 12 of the absorbing core. The method comprises: a step of forming successive absorber 10, in which adhesive agent is applied onto strip-shaped core wrap sheets 15, then the absorbing core 11 comprising non-fabric part 12 is arranged on the core wrap sheets, and a successive absorber 10 in which the absorbing core 11 is enclosed between the core wrap sheets is provided; a first press step in which the successive absorber 10 is entirely pressed; a second press step in which the part comprising the non-fabric part 12 in the successive absorber 10 is topically pressed; and a successive material cutting step after the second press step, in which the successive absorber 10 is cut into separated individual absorbers.SELECTED DRAWING: Figure 5

Description

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

As an absorbent body of absorbent articles such as disposable diapers and sanitary napkins, an absorbent core composed of a fiber material piled up with tissue paper or a permeable core wrap sheet is widely known. . Further, for manufacturing the absorbent core, for example, a stacking drum having an accumulation recess on the outer peripheral surface, and a duct for supplying a core-forming material such as defibrated pulp to the outer peripheral surface of the stacking drum in a scattered state; And a fiber stacking apparatus for depositing the core forming material in a predetermined shape in the recesses for accumulation by suction while rotating the fiber stacking drum.
Further, the absorbent body having such a structure is provided with a plurality of deformation induction regions extending in a direction that coincides with the wearer's front-rear direction when the absorbent article is worn, and along the deformation induction regions when the absorbent article is worn. In addition, a technique for improving leakage prevention and fitting to a wearer's body by bending and deforming the absorber is also known (see Patent Documents 1 to 3). It is also described that the absorbent core is provided with a non-stacked fiber portion in which the material for forming the absorbent core is not present, and the upper core wrap sheet and the lower core wrap sheet of the absorbent core are joined in the non-stacked fiber portion. Has been.

JP 2014-136126 A JP 2014-103982 A JP 2012-034715 A

  As described in Patent Document 3 described above, when the core wrap sheets facing each other across the non-stacked fiber portion are joined via the non-stacked fiber portion provided in the absorbent core, the shape retention of the absorbent core As a result, the absorber is stably bent with the portion provided with the non-stacking portion as a deformation induction region, and is easily deformed into a designed state.

However, as shown in FIG. 5 of Patent Document 3, in order to join the upper and lower core wrap sheets through the non-stacking portion, an adhesive is applied to the core wrap sheets that are continuously conveyed, and the adhesion After disposing the absorbent core on the agent, roll up both sides of the core wrap sheet, wrap the entire absorbent core, and then partially pressurize with a convex part corresponding to the shape of the non-stacked part If the core wrap sheet is pressed with a roll to join the upper and lower core wrap sheets, the core wrap sheet will be broken when the core wrap sheet is pushed into the non-stack fiber section. Is likely to occur. By increasing the rigidity of the core wrap sheet, such as by increasing the thickness of the core wrap sheet, the core wrap sheet is less likely to be torn, but on the other hand, the softness of the absorbent body is impaired, and the absorbent body is worn by the wearer's body. Inconveniences such as being difficult to follow are likely to occur.

  In addition, if the time from application of the adhesive to pressing with the partial pressure roll is short, the adhesive that has not been cooled and hardened easily oozes through the core wrap sheet, and the exuded adhesive is It becomes easy to adhere to the roll for conveyance and various processes. If the amount of the adhesive used is reduced, the adhesive is less likely to ooze out, but on the other hand, peeling is likely to occur between the core wrap sheets joined via the non-stacked portion.

  Therefore, the subject of this invention is providing the manufacturing method of the absorber which can eliminate the fault which the prior art mentioned above has.

  The present invention manufactures an absorbent body including an absorbent core and a core wrap sheet that wraps the absorbent core, and the upper and lower core wrap sheets are joined to each other through a non-stacked fiber portion formed on the absorbent core. An absorbent body manufacturing method comprising: applying an adhesive to a belt-shaped core wrap sheet; and then disposing an absorbent core having a non-stacked portion on the core wrap sheet, wherein the absorbent core is a core The formation process of the absorber continuum for manufacturing the absorber continuum wrapped with the wrap sheet, the first press step for pressurizing the entire absorber continuum, and the non-product in the absorber continuum after the first press step Manufacture of an absorbent body comprising a second pressing step for locally pressurizing a portion having a fine portion, and a continuous body cutting step for cutting the absorbent continuous body after the second pressing step and separating it into individual absorbent bodies A method is provided.

  According to the present invention, it is difficult to cause peeling at the joint portion between the core wrap sheets via the non-stacked fiber portion, and it is possible to manufacture an absorbent body having excellent shape retention of the absorbent core, and at the time of manufacturing Also provided is a method for producing an absorbent body that is less likely to break the core wrap sheet and ooze out adhesive.

FIG. 1 is a perspective view showing an example of an absorbent body manufactured according to an embodiment of the present invention. 2 is a schematic cross-sectional view taken along the line II-II in FIG. FIG. 3 is a schematic view showing a process of forming an absorbent body continuum in one embodiment of the present invention. FIG. 4 is a partially broken perspective view showing the pre-press absorbent continuous body in one embodiment of the present invention. FIG. 5 is a schematic perspective view showing a multi-stage pressing process in one embodiment of the present invention. Fig.6 (a) is sectional drawing which shows the absorber continuous body before the 1st press process in one embodiment of this invention, FIG.6 (b) shows the same absorber continuous body after a 1st press process. It is sectional drawing shown. FIG. 7 is a schematic cross-sectional view taken along line AA in FIG. FIG. 8 is a schematic cross-sectional view showing an example of an absorbent article including an absorbent body manufactured in one embodiment of the present invention.

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 manufacturing method of the absorber of this invention is demonstrated with reference to FIG.1 and FIG.2.
The absorbent body 1 shown in FIGS. 1 and 2 includes an absorbent core 11 and a core wrap sheet 15 that wraps the absorbent core 11. The core wrap sheet 15 covers the upper and lower surfaces of the absorbent core 11 as shown in FIG. 2, and more specifically, as shown in FIG. 2, one side along the longitudinal direction X of the absorbent body 1. It has the overlap part 15c of the core wrap sheet | seat with which the edge part and the other side edge part were laminated | stacked. Thereby, the core wrap sheet | seat 15 has coat | covered the perimeter of the width direction cross section of the absorptive core 11 including the upper and lower surfaces and both sides | surfaces of the absorptive core 11. FIG. Moreover, the core wrap sheet | seat 15 has the part extended from the both ends of the absorbent core 11 in the both ends of the longitudinal direction X of the absorber 1, and the end where the core wrap sheet | seat was joined to the extension part. An adhesive portion 18 is provided. The longitudinal direction of the absorbent body 1 and the longitudinal direction of the absorbent core 11 are both the X direction in FIG. 1 and correspond to the machine direction (MD) at the time of manufacture.

  As shown in FIGS. 1 and 2, the absorbent core 11 has side non-stacking portions 12 and 12 as non-stacking portions on both sides sandwiching the longitudinal center line CL of the absorbent body 1. Yes. Further, a central non-stacking portion 13 is provided between the side non-stacking portions 12 and 12 in the width direction Y of the absorbent body 1. The side non-stacking portions 12, 12 and the center non-stacking portion 13 all extend in the longitudinal direction X of the absorbent body 1. Moreover, the side part non-stacking part 12 has a space | interval between the side edges of the absorptive core 11, and has a space | interval also between the center non-stacking fiber part 13. FIG. The absorptive core 11 has the side non-stacking part 12 to which the upper and lower core wrap sheets were joined in the central region 1c in the longitudinal direction X. Moreover, the absorptive core 11 does not have the side part non-stacking part 12, and the non-partition part in which the stacking part continues over the full width of the width direction of the absorbent core 11 is the edge part area | region of the longitudinal direction X. 1f, 1r. In addition, the absorptive core 11 has a pair of side cores 11s spaced apart from the central core 11a on both sides in the central region 1c in the longitudinal direction X by having the pair of side non-stacking parts 12, 12. doing.

  The absorptive core 11 in the absorbent body 1 is made of a fiber material stack. The fiber fabric stack includes both a stack including only fiber materials such as pulp fibers and a stack including a fiber material and a water-absorbing polymer. When producing the absorbent core 11 in the fiber stacking apparatus 31 shown in FIG. 3, the fiber stack including only the fiber material supplies only the fiber material a to the outer peripheral surface of the fiber stack drum 32 via the duct 34. Obtained by. When the absorbent core 11 including the fiber material and the water-absorbing polymer is manufactured by the fiber stacking apparatus 31 illustrated in FIG. 3, the fiber material a and the fiber material a and It is obtained by supplying the water-absorbing polymer b.

  Examples of the fiber material a constituting the absorbent core 11 include, for example, pulp fibers such as defibrated pulp, cellulosic fibers such as rayon fibers, cotton fibers, and cellulose acetate fibers, polyolefin fibers made of polyolefin such as polyethylene and polypropylene, Condensed fibers made of polyester, polyamide or the like can be used. Examples of the water-absorbing polymer b constituting the absorbent core 11 include sodium polyacrylate, (acrylic acid-vinyl alcohol) copolymer, cross-linked sodium polyacrylate, (starch-acrylic acid) graft copolymer, (Isobutylene-maleic anhydride) copolymer and its saponified product, particles made of polyaspartic acid, and the like. The fiber material and the water-absorbing polymer can be used singly or in combination of two or more. Various known materials can be used as the core wrap sheet 15, and for example, a thin paper such as a tissue paper or a water-permeable nonwoven fabric is preferably used.

The side non-stacking portion 12 of the absorbent core 11 is a portion where there is no material (core forming material) for forming the absorbent core, and as shown in FIG. The upper and lower core wrap sheets of the absorbent core 11 are joined to each other. The side non-stacking portion 12 is preferably a portion where no core forming material is present from the viewpoint of strong bonding between the core wrap seeds, but does not hinder direct bonding with the adhesive between the core wrap seeds. To some extent, some core forming material may be present. The center non-stacked fiber portion 13 is a non-stacked fiber portion that is arbitrarily provided separately from the “non-stacked fiber portion” in the present invention, and a material (core) that forms an absorbent core in the same manner as the side non-stacked fiber portion 12. 2), the upper and lower core wrap sheets of the absorbent core 11 are different from each other in the central non-stacked fiber portion 13 as shown in FIG. Not joined.
As shown in FIG. 8, the absorbent body 1 shown in FIG. 2 is interposed between a liquid-permeable top sheet 21 and a liquid-impermeable back sheet 23 in the absorbent article 100, so that one of the absorbent articles. Part may be configured, and any surface may be incorporated into the absorbent article toward the surface sheet 21 side. However, in the method of manufacturing an absorbent body to be described later, the upper surface P in FIG. The lower surface Q in FIG. 2 is directed to the back sheet 23 side.

Next, one embodiment of the manufacturing method of the absorber of the present invention for manufacturing the above-described absorber 1 will be described with reference to FIGS.
The manufacturing method of the absorber of this embodiment comprises the formation process of an absorber continuum, the multistage press process which consists of a plurality of press processes (the 1st-3rd press process), and the continuum cutting process.
(Formation process of absorber continuum)
The forming process of the absorbent continuous body in this embodiment includes an adhesive coating process, an absorbent core transfer process, and an absorbent core coating process. Specifically, the adhesive is applied to the belt-shaped core wrap sheet. After the construction (adhesive coating process), an absorbent core having a non-stacked fiber portion was placed on the core wrap sheet (absorbent core transfer process), and the absorbent core was wrapped with the core wrap sheet. An absorbent continuous body is produced (absorbent core coating step).
The adhesive coating process is performed in the adhesive coating unit 2 shown in FIG. In the adhesive coating process, the adhesive 16 (see FIG. 4) is applied to the strip-shaped core wrap sheet 15 continuously transported by a known transport mechanism using a known adhesive coating device 20. To do. The adhesive 16 is applied to the surface of the strip-shaped core wrap sheet 15 on which the absorbent core 11 is placed, and at least as shown in FIG. 4 and FIG. Apply to the part that overlaps the part 12. The adhesive 16 may be applied continuously in the longitudinal direction of the side non-stacked fiber portion 12 or may be intermittently applied in the longitudinal direction of the side non-stacked fiber portion 12, but continuously. It is preferable to coat it. Further, instead of coating the portion where the side non-stacked fiber portion 12 is disposed, it is applied to the entire area facing one side of the absorbent core 11 including the portion where the side non-stacked fiber portion 12 is disposed. You may work.

Moreover, it is preferable that the adhesive applied to the core wrap sheet 15 is applied in a regular pattern. For example, the core wrap sheet 15 has the same width as or wider than the side non-stacked fiber portion 12. The adhesive 16 is applied along the longitudinal direction of the absorbent core 11 in a spiral pattern, a continuous wave pattern, a zigzag pattern, a pattern with a continuous Ω character, etc. In the core coating step, the side non-stacked fiber portion 12 is positioned on or under the adhesive, and in the second press step described later, the upper and lower core wrap sheets of the absorbent core 11 are interposed via the adhesive. It is also preferable to join the two together. The coating width of the adhesive 16 may be narrower than the width of the side non-stacking portion 12, and the bonding extends in the longitudinal direction of the side non-stacking portion 12 within the width of the side non-stacking portion 12. It can also coat so that multiple agent coating parts may be formed. The coating range of the adhesive 16 is preferably 50% or more, more preferably 80% or more, and still more preferably 100% or more of the total length L2 (see FIG. 1) of the side non-stacking portion 12 (non-stacking portion). It is.
As the adhesive 16, various known materials that are conventionally used for bonding between constituent members of absorbent articles and absorbent bodies can be used without particular limitation, and a hot melt adhesive is preferably used.

(Absorptive core transfer process)
The absorbent core transfer process is performed in the absorbent core transfer unit 3 shown in FIG. In the absorbent core transfer process, the absorbent core 11 manufactured by the fiber stacking device 31 is replaced with the core wrap sheet 15 as shown in FIG. 3 with respect to the band-shaped core wrap sheet 15 after the adhesive coating process. Are intermittently transferred and arranged along the longitudinal direction. The fiber stacking device 31 scatters a fiber forming drum 32 having an accumulation recess 33 on the outer peripheral surface, and a core forming material such as a fiber material a such as defibrated pulp and a water absorbent polymer b on the outer peripheral surface of the fiber stacking drum 32. The core forming material supplied via the duct 34 is deposited in the accumulation recess 33 by suction while rotating the fiber stacking drum 32. The core forming material deposited in the accumulation concave portion 33 is formed into a shape corresponding to the accumulation concave portion 33 and is sequentially transferred onto the core wrap sheet 15 as the absorbent core 11 having a predetermined shape.

(Absorbent core coating process)
The said absorptive core coating process is performed in the core wrap sheet folding | turning part 4 shown in FIG. In the absorptive core transfer step in the present embodiment, the absorptive core 11 is arranged at the center in the width direction of the core wrap sheet (direction perpendicular to the machine direction (MD), which is the conveyance direction of the core wrap sheet). In the absorbent core coating step, the portion of the core wrap sheet 15 after the absorbent core transfer step that extends outward from both side edges of the absorbent core 11 is the upper surface side of the absorbent core 11. The absorbent core 11 is wrapped with a core wrap sheet. It is preferable that both side portions of the core wrap sheet 15 wound up on the upper surface side are partially overlapped as shown in FIG. It is necessary to join between the overlapped sheets through an adhesive so that the core forming material forming the absorbent core does not leak from the core wrap sheet.
The absorbent core continuous body 10 before press as shown in FIG. 4 is obtained by the absorbent core coating process. Hereinafter, the absorber continuum 10 before the pressing step is also referred to as a pre-press absorber continuum 10A for convenience.

(Multistage press process)
The multi-stage press process in this embodiment includes a three-stage press process including first to third press processes. Moreover, it comprises a top-bottom inversion process prior to that.
The upside down process is performed in the upside down unit 5, and in the upside down process, the pre-press absorbent continuous body 10 </ b> A obtained in the absorbent core coating process is transferred to an arbitrary transport mechanism such as a pair of driven rollers 51 and 52. Thus, after the upper and lower surfaces are reversed, they are introduced into the pressing process.

(First press process)
The first pressing step is performed in the first pressing unit 6 shown in FIG. In the first pressing step, the pre-press absorbent continuum 10A described above is pressurized between a pair of rolls 61 and 62 having a flat surface, and the pre-press absorbent continuum 10A as a whole is pressurized.
In the first pressing step, as the pair of rolls 61 and 62, rolls having smooth surfaces can be used, but as one or both rolls, minute irregularities are uniformly formed on the surface in a constant pattern. It is also possible to use rolls that are present. For example, as one or both of the rolls, a roll having a grid-like protruding portion on the surface and a portion corresponding to the eyes of the grid being a concave portion can be used. However, as for the size of the lattice, the length of one side of the lattice is preferably 10 mm or less.
The rolls 61 and 62 used in the first pressing step preferably have a surface made of a hard material such as metal, ceramic, or hard rubber.

In the first pressing step, the core wrap sheet 15 is suddenly stretched and broken in the portion that overlaps the side non-stacked fiber portion 12 in the purpose of preventing breakage of the absorbent core 11 and the second pressing step described later. It is done for the purpose of preventing.
In the first pressing step, since the main purpose is not to join the core wrap sheets 15 through the side non-stacking portions 12, it is preferable to provide a clearance with a certain width between the rolls 61 and 62. From the viewpoint of preventing partial curing of the absorbent body and tearing of the core wrap sheet when the distribution of the fiber material and the water-absorbing polymer is uneven, the clearance between the pressure rolls 61 and 62 in the first pressing step is preferably Is 1.0 mm or more, more preferably 1.5 mm or more, preferably 3.0 mm or less, more preferably 2.5 mm or less, and preferably 1.0 mm or more and 3.0 mm or less, more preferably It is 1.5 mm or more and 2.5 mm or less.

In the first pressing step, as shown in FIGS. 6A and 6B, the thickness t1 of the portion where the absorbent core 11 exists inside the pre-press absorbent continuum 10A is set as the absorbent core 11. It is preferable to reduce uniformly over the whole area in the width direction.
The thickness reduction rate before and after the first pressing step [(t1-t2) / t1 × 100] is preferably 10% or more, more preferably 20% or more, and preferably 50% or less, more preferably 40%. Or less, preferably 10% to 50%, more preferably 20% to 40%.

Further, the applied pressure per unit length (1 m) calculated by the following method in the first pressing step is preferably 10 kN / m or more, more preferably 15 kN / m or more, and preferably 30 kN / m or less, more preferably. Is 25 kN / m or less, preferably 10 kN / m or more and 30 kN / m or less, more preferably 15 kN / m or more and 25 kN / m or less.
[Calculation method of applied pressure per unit length]
The pressing force by the air cylinder is calculated from the air pressure applied to the air cylinder and the tube area of the cylinder used, and the pressing force is divided by the contact length of the roll in the CD direction at the circumferential contact point of the upper and lower rolls. The value is the pressing force per unit length.

(Second press process)
The second pressing step is performed in the second pressing unit 7 shown in FIG. In the 2nd press process, the part which has the non-stacking part in the absorber continuous body 10 is pressurized locally. Specifically, in the second pressing step, the absorbent continuous body 10 after the first pressing step is pressed with a pressing roll 71 having a pressing portion 72 in a portion corresponding to the side non-stacking portion 12, and pressing. It introduce | transduces between the receiving roll 73 and the receiving roll 73 opposingly arranged, presses, and the side part non-stacking part 12 in the core wrap sheet | seat 15 of the upper surface side of the absorptive core 11 in the pushing part 72 of the pressurization roll 71 The overlapping portion 15a is pressed against the opposing portion 15b of the core wrap sheet 15 located on the lower side of the absorbent core 11, and is bonded via the adhesive 16 applied in the adhesive application step.
Since the second pressing step is mainly intended for joining the core wrap sheets 15 via the side non-stacking portions 12, the clearance between the pressing portion 72 of the pressure roll 71 and the receiving roll 73 is It is preferable to make it smaller than the clearance between the rolls in 1 press process, and it is still more preferable to set it as zero.
The pressure roll 71 used in the second pressing step preferably has a surface made of a hard material such as metal or ceramic. The receiving roll 73 may have a surface made of a hard material, but it is also preferable to use a surface made of a rubber-like elastic material.

(Third press process)
The third press step is performed in the third press section 8 shown in FIG.
In the method of the present embodiment, the absorbent core 11 is intermittently disposed with respect to the belt-shaped core wrap sheet 15 continuously conveyed in the above-described absorbent core transfer step. The continuous body 10A and the absorbent continuous body 10 after the first and second pressing steps both include the absorbent core 11 intermittently in the longitudinal direction, intermittently in the transport direction (machine direction MD), It has a portion where the absorbent core 11 does not exist.
In the third pressing step of the present embodiment, the pressure roll 81 having the convex portion 82 for forming the end adhesive portion is interposed between the absorbent cores 11 in the absorbent body continuum 10 after the second pressing step, and the convex The part 82 is pressed between the peripheral surface and the receiving roll 83 to form an end bonded portion 18A in which the upper and lower core wrap sheets 15a and 15b are joined.
Since the third press step is also mainly intended for joining the core wrap sheets 15, the clearance between the convex portion 82 of the pressure roll 71 and the receiving roll 83 is smaller than the clearance between the rolls in the first press step. Preferably, it is more preferable to set it to zero.

(Continuous body cutting process)
The continuous body cutting step is performed in a cutting step section (not shown). In the continuous body cutting step, the absorbent body continuous body 10 after the third pressing step is cut and separated into individual absorbent bodies. Specifically, in the continuum cutting step, the absorber continuous body 10 is cut across the entire width direction at an intermediate position of the end bonding portion 18A by various known arbitrary cutting means. 1 and the absorbent body 1 for one absorbent article shown in FIG. 2 is obtained.
The third pressing step and the absorber cutting step described above may be performed only in the state of the absorber continuous body 10 after the second pressing step. However, in the method of this embodiment, as shown in FIG. While making back sheet 23 for manufacturing an absorptive article using body 1 to absorber continuum 10 after the 2nd press process, for manufacturing an absorptive article using absorber 1 The top sheet 21 is also joined to the absorber continuum 10 after the second pressing step, and the above-described third pressing step and absorber cutting step are sandwiched between the top sheet 21 and the back sheet 23. This is performed for the absorber continuum 10 in a heated state. Therefore, the absorber 1 shown in FIG.1 and FIG.2 is obtained as the state pinched | interposed between the surface sheet 21 and the back surface sheet 23, as shown in FIG.

  As is apparent from the above description, according to the method of the present embodiment, the absorbent body 1 in which the upper and lower core wrap sheets 15 are joined to each other through the side non-stacking portion 12 provided in the absorbent core 11 is obtained. can get. Since the absorbent body 1 has the side non-stacking portions 12 in which the upper and lower core wrap sheets 15 are joined together, the shape retention of the absorbent core 11 is improved, and the absorbent core 11 is used by being incorporated in an absorbent article. The portion provided with the side non-stacking fiber portion 12 functions and bends as a deformation induction region, and the absorbent body 1 is deformed as designed. Thereby, the absorbent article 100 containing the absorber 1 becomes excellent in leak-proof property and fit property.

  And in the method of this embodiment, the 1st press process which pressurizes the absorber continuous body 10 whole before the 2nd press process which joins an upper and lower core wrap sheet | seat through the side part non-stacking part 12 is carried out. Since it comprises, the part which overlaps the side part non-stacking fiber part 12 of the core wrap sheet | seat 15 at a 2nd press process can be prevented from being rapidly stretched and torn. Moreover, since it is not necessary to thicken the core wrap sheet in order to prevent the core wrap sheet 15 from being torn, the softness of the absorbent body is not impaired, and the absorbent body becomes difficult to follow the wearer's body. Inconvenience can also be prevented.

  In addition, before the second pressing step of joining the upper and lower core wrap sheets through the side non-stacking portion 12, the second pressing step is performed after the adhesive is applied by including the first pressing step. The time until pressurization becomes longer. Therefore, it is difficult for adhesive that has not been cured after coating to ooze out through the core wrap sheet, and defects due to adhesion of the adhesive to the roll for transportation and various processing, for example, adhesive that has adhered. Therefore, it is possible to prevent inconveniences such as an increase in the number of stoppages of equipment and a decrease in operating rate, and an adhesive accumulated in a roll falling off and mixing into a product. In addition, unlike the case where the amount of adhesive applied is reduced to prevent bleeding, peeling is unlikely to occur at the joint between the upper and lower core wrap sheets via the non-stacked portion.

  Moreover, in the method of the embodiment mentioned above, as shown in FIG. 3, the back surface sheet 23 for manufacturing the absorbent article 100 using the absorber 1 is after the 2nd press process and before the 3rd press process. The absorber continuum 10 is merged. When the second pressing step is performed in a state of being laminated with the back sheet 23, there is a risk that a hole may be formed in the back sheet 23 when the portion having the side non-stacking portion 12 is pressed in the second pressing process. However, such inconvenience can be prevented by joining the back surface sheet 23 to the absorbent body continuum 10 after the second pressing step as in the present embodiment. In addition, the back sheet 23 to be joined is applied with an adhesive on the surface on the absorber continuous body 10 side, and thereby the back sheet 23 is attached to the absorber continuous body 10.

  Moreover, in the method of embodiment mentioned above, as shown in FIG. 3, the surface sheet 21 for manufacturing the absorbent article 100 using the absorber 1 is after a 2nd press process and before a 3rd press process. The absorber continuum 10 is merged. By performing the third pressing step in a state where the topsheet 21 is laminated with the absorbent continuous body 10, in the third pressing step, the adhesive disposed between the absorbent cores 11 oozes out to the topsheet 21 side. It is possible to prevent this, and it is possible to prevent inconvenience due to the adhesive adhering to the roll for conveyance and various processing.

Moreover, a cooling means can also be provided in any one or both of the rolls 61 and 62 used at a 1st press process. By providing the cooling means, it is possible to more reliably prevent the adhesive from bleeding in the second pressing step.
As the cooling means, a method in which the roll is made into a hollow structure and the cooling water is circulated can be considered. Moreover, the apparatus which circulates cooling water is equipped with the cooling device of water as needed. It is preferable to take a long contact time between the sheet to be transported and the cooled roll for efficient cooling, and it is possible to set the transport route so that the roll diameter is as large as possible and the sheet is more wound around the cooled roll. preferable. Moreover, it is preferable that the surface temperature of the roll provided with the cooling means can be maintained at 25 ° C. or lower, and more preferably 20 ° C. or lower.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention can be suitably changed without being restrict | limited to said embodiment.
For example, in the above-described embodiment, the absorbent body 1 having the central non-stacked fiber portion 13 in addition to the side non-stacked fiber portion 12 is manufactured, but an absorbent body without the central non-stacked fiber portion 13 may be manufactured. . Moreover, in the embodiment mentioned above, although the absorber 1 which has the side part non-stacking part 12 on each of the both sides of the center line of a longitudinal direction was manufactured, the non-stacking part to which the upper and lower core wrap sheets were joined is one. Only one or two or more unstacked portions can be appropriately changed.

Moreover, although the embodiment mentioned above has arrange | positioned the absorptive core 11 intermittently with respect to the strip | belt-shaped core wrap sheet | seat 15 conveyed continuously in an absorptive core transfer process, it replaces with it and it conveys continuously. The strip-shaped core wrap sheet 15 may be provided with a strip-shaped absorbent core continuous in the same direction as the longitudinal direction thereof. In that case, the third press step is omitted and the continuous body cutting step is performed. May be.
In addition, instead of covering the upper and lower surfaces of the absorbent core by winding up the portions extending outward from both side edges of the absorbent core in the strip-shaped core wrap sheet to the upper surface side of the absorbent core, After the absorbent core is placed on the belt-shaped core wrap sheet, another core wrap sheet is joined, and they are joined to the outside of the side of the absorbent core or the part overlapping the upper or lower surface of the absorbent core. In addition, it is possible to obtain an absorbent body continuous body in which an absorbent core is wrapped in a core wrap sheet.

Moreover, it is not necessary to join one or both of the surface sheet 21 and the back surface sheet 23 before a 3rd press process.
Examples of absorbent articles include disposable diapers, incontinence pads, sanitary napkins, panty liners, and the like. Moreover, when manufacturing absorbent articles, such as an absorbent article which comprises a liquid-permeable surface sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the two sheets, the surface sheet is a non-woven fabric. And a perforated film can be used, and examples of the back sheet include a resin film, a laminate of a resin film and a nonwoven fabric, and the like. With respect to the back sheet, poor liquid permeability is a concept including liquid impermeability.

This invention discloses the manufacturing method of the following absorber further regarding embodiment mentioned above.
<1>
An absorbent body that includes an absorbent core and a core wrap sheet that wraps the absorbent core, and that manufactures an absorbent body in which the upper and lower core wrap sheets are joined to each other through a non-stacked fiber formed in the absorbent core. A manufacturing method comprising:
After applying an adhesive to a strip-shaped core wrap sheet, an absorbent core having an unstacked portion is arranged on the core wrap sheet, and the absorbent core is wrapped with the core wrap sheet. After the first press step for pressurizing the entire absorber continuum, the first press step, the portion having the unstacked portion in the absorber continuum is locally added. The manufacturing method of an absorber which comprises the continuous body cutting process which cut | disconnects the said absorber continuous body after a 2nd press process to press, and the 2nd press process, and isolate | separates it into each absorber.

<2>
The absorber continuum includes the absorbent core intermittently in the longitudinal direction;
The manufacturing method of the absorber as described in said <1> which has a 3rd press process which pressurizes locally between the absorptive cores in the said absorber continuous body after a 2nd press process.
<3>
In both the first press step and the second press step, the absorber continuous body is pressurized between a pair of rolls, and the clearance between the rolls in the second press step is more than the clearance between the rolls in the first press step. The manufacturing method of the absorber as described in said <1> or <2> small.
<4>
The method for producing an absorbent body according to any one of <1> to <3>, wherein a back sheet for producing an absorbent article is joined to the absorbent continuous body after the second pressing step.
<5>
The method for producing an absorbent body according to any one of <1> to <4>, wherein a top sheet for producing an absorbent article is merged with the continuous body of absorbent body after the second pressing step.

<6>
In the first pressing step, the absorbent body according to any one of <1> to <5>, wherein one or both of the rolls are pressurized between a pair of rolls provided with cooling means. Manufacturing method.
<7>
In the first pressing step, the absorber continuum is pressed between a pair of rolls, and one or both of the rolls use a roll having irregularities formed on the surface in a uniform pattern. The manufacturing method of the absorber as described in any one of <6>.
<8>
The manufacturing method of the absorber as described in said <7> using the roll which has a grid | lattice-like protruding part on the surface as said one or both rolls, and the part equivalent to the eyes of a grid | lattice became a recessed part.
<9>
The size of the grid is the method for producing an absorbent body according to <8>, wherein the length of one side of the grid is 10 mm or less.
<10>
In the second pressing step, the collecting continuum after the first pressing step is composed of a pressure roll having a pressing portion in a portion corresponding to the non-stacking portion, and a receiving roll disposed to face the pressure roll. Relative to the core wrap sheet located under the absorbent core, the portion that overlaps with the unstacked portion of the core wrap sheet on the upper surface side of the absorbent core at the pressing portion of the pressure roll, introduced and pressed between The method for producing an absorbent body according to any one of the above items <1> to <9>, wherein the absorbent material is pressed and bonded to a facing portion.

<11>
The manufacturing method of the absorber as described in any one of <1> to <10>, wherein the clearance between rolls in the second pressing step is zero.
<12>
In the third press step, the space between the absorbent cores in the absorbent body after the second press step is pressurized between a pressure roll having a convex portion and a receiving roll that receives the convex portion on the peripheral surface, The method for producing an absorbent body according to any one of <1> to <11>, wherein an end bonded portion in which upper and lower core wrap sheets are joined is formed.
<13>
In both the first press process and the third press process, the absorber continuous body is pressurized between a pair of rolls, and the clearance between the rolls in the third press process is more than the clearance between the rolls in the first press process. The manufacturing method of the absorber as described in any one of <1> to <12>, which is small.
<14>
The manufacturing method of the absorber as described in said <13> which makes the clearance between rolls in a 3rd press process zero.
<15>
In the continuous body cutting step, the absorbent continuous body is cut over the entire width direction at an intermediate position of the end adhesive portion formed in the third pressing step, according to <1> to <14>. The manufacturing method of the absorber of any one.

<16>
The absorption according to any one of <1> to <15>, wherein the top sheet for producing the absorbent article is joined to the absorbent continuous body after the second pressing step and before the third pressing step. Body manufacturing method.
<17>
The absorption according to any one of <1> to <16>, wherein the back sheet for producing the absorbent article is joined to the absorbent continuous body after the second pressing step and before the third pressing step. Body manufacturing method.
<18>
The said non-stacking part is a manufacturing method of the absorber as described in any one of said <1>-<17> extended in the longitudinal direction of an absorber.
<19>
The absorbent body according to any one of <1> to <18>, wherein the non-stacked fiber part is a side non-stacked fiber part disposed on each of both sides across the longitudinal center line of the absorbent body. Production method.
<20>
The absorbent body has a central non-stacked fiber portion between the side non-stacked fiber portions in the width direction, and the upper and lower core wrap sheets of the absorbent core are joined to each other in the central non-stacked fiber portion. The manufacturing method of the absorber as described in said <19> which is not.

<21>
The absorbent core continuous body or the core wrap sheet in the absorbent body covers the upper and lower surfaces of the absorbent core, and the core wrap is formed by laminating one side edge and the other side edge along the longitudinal direction of the absorber. The method for producing an absorbent body according to any one of <1> to <20>, wherein the sheet has an overlapping portion.
<22>
The method for producing an absorbent body according to <21>, wherein the core wrap sheets in the overlapped portion are joined together via an adhesive.
<23>
The step of forming the absorbent continuous body includes an adhesive coating step of applying an adhesive to a strip-shaped core wrap sheet, and the adhesive is applied to the absorbent core in the adhesive coating step. The manufacturing method of the absorber as described in any one of said <1>-<22> applied continuously in the longitudinal direction of the said unstacked fiber part.
<24>
The forming process of the absorbent continuous body includes an absorbent core transfer process, and in the absorbent core transfer process, the belt-shaped core wrap sheet after the adhesive coating process is manufactured in a fiber stacking apparatus. The absorbent core according to any one of <1> to <23>, wherein the absorbent core that has been transferred is transferred to a central portion in the width direction of the core wrap sheet that is orthogonal to the conveyance direction of the core wrap sheet. Production method.
<25>
The forming process of the absorbent continuous body includes an absorbent core coating process. In the absorbent core coating process, the absorbent core coating process is performed by removing the absorbent core from both side edges of the absorbent core in the core wrap sheet after the absorbent core transfer process. The method for producing an absorbent body according to any one of <1> to <24>, wherein a portion extending toward the upper side is wound up on an upper surface side of the absorbent core, and the absorbent core is wrapped with a core wrap sheet.

<26>
In the step of forming the absorber continuum, the pre-press absorber continuum before the press step is manufactured in the order of the adhesive coating step, the absorbent core transfer step, and the absorbent core coating step, The manufacturing method of the absorber as described in any one of <1>-<25>.
<27>
Between the formation process of the said absorber continuous body and the said 1st press process, it comprises the upside down process, and in this upside down process, the absorber continuous body before the press obtained in the absorptive core coating process The manufacturing method of the absorber as described in any one of the above items <1> to <26>.
<28>
The clearance between the pressure rolls in the first pressing step is preferably 1.0 mm or more, more preferably 1.5 mm or more, preferably 3.0 mm or less, more preferably 2.5 mm or less, Preferably, it is 1.0 mm or more and 3.0 mm or less, More preferably, it is 1.5 mm or more and 2.5 mm or less, The manufacturing method of the absorber in any one of said <1>-<27>.
<29>
The pressing force per unit length (1 m) in the first pressing step is preferably 10 kN / m or more, more preferably 15 kN / m or more, and preferably 30 kN / m or less, more preferably 25 kN / m or less, Moreover, Preferably it is 10 kN / m or more and 30 kN / m or less, More preferably, it is 15 kN / m or more and 25 kN / m or less, The manufacturing method of the absorber in any one of said <1>-<28>.

DESCRIPTION OF SYMBOLS 1 Absorber 2 Adhesive coating part 3 Absorbent core transfer part 31 Stacking device 4 Folding part of core wrap sheet 5 Upside down part 6 1st press part 61,62 roll 7 2nd press part 71 Pressure roll 72 Push Part 73 Roll 8 Third press part 81 Pressure roll 82 Convex part for forming end adhesive part 83 Roll 10A Absorbent body continuum before press (absorber continuum)
10 Absorbent body continuum 11 Absorbent core 12 Non-stacked fiber part (non-stacked fiber part)
13 Central unstacked fiber part 15 Core wrap sheet 16 Adhesive 18, 18A End adhesive part 100 Absorbent article 21 Top sheet 23 Back sheet

Claims (6)

An absorbent body that includes an absorbent core and a core wrap sheet that wraps the absorbent core, and that manufactures an absorbent body in which the upper and lower core wrap sheets are joined to each other through a non-stacked fiber formed in the absorbent core. A manufacturing method comprising:
After applying an adhesive to a strip-shaped core wrap sheet, an absorbent core having an unstacked portion is arranged on the core wrap sheet, and the absorbent core is wrapped with the core wrap sheet. After the first press step for pressurizing the entire absorber continuum, the first press step, the portion having the unstacked portion in the absorber continuum is locally added. The manufacturing method of an absorber which comprises the continuous body cutting process which cut | disconnects the said absorber continuous body after a 2nd press process to press, and the 2nd press process, and isolate | separates it into each absorber. The absorber continuum includes the absorbent core intermittently in the longitudinal direction;
The manufacturing method of the absorber of Claim 1 which has a 3rd press process which pressurizes locally between the absorptive cores in the said absorber continuous body after a 2nd press process.   In both the first press step and the second press step, the absorber continuous body is pressurized between a pair of rolls, and the clearance between the rolls in the second press step is more than the clearance between the rolls in the first press step. The manufacturing method of the absorber of Claim 1 or 2 which is small.   The manufacturing method of the absorber of any one of Claims 1-3 which joins the back surface sheet for manufacturing an absorbent article with respect to the absorber continuous body after a 2nd press process.   The manufacturing method of the absorber of any one of Claims 1-4 which joins the surface sheet for manufacturing an absorbent article with respect to the absorber continuous body after a 2nd press process. In the 1st press process, manufacture of an absorber given in any 1 paragraph of Claims 1-5 which pressurizes said absorber continuum between a pair of rolls in which one or both rolls were provided with a cooling means. Method.

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