JP4901455B2 - Absorber manufacturing method - Google Patents

Description

  The present invention relates to a method for producing an absorbent body preferably used as an absorbent body for absorbent articles such as disposable diapers, sanitary napkins, and incontinence pads.

As an absorbent body for absorbent articles such as disposable diapers, sanitary napkins, and incontinence pads, an absorbent body including a fiber assembly made of a fiber material such as pulp fiber and an absorbent polymer is widely used.
In the manufacturing process of such an absorbent body, it is widely performed that the absorbent polymer is sprayed on the fiber assembly. However, when it is sprayed on the surface of the fiber assembly moving at a high speed, it was sprayed. The polymer is splashed on the surface of the fiber assembly and scattered in the downstream direction. In addition, when the absorbent polymer is sprayed in a pattern so that a part where the absorbent polymer is deposited and a part where the absorbent polymer is not deposited are formed on the fiber assembly, it is scattered to the part where the absorbent polymer is not desired to be deposited. The absorptive absorbent polymer is deposited, and the boundary between the absorbent polymer deposited portion and the non-deposited portion becomes unclear.
2. Description of the Related Art Conventionally, there is known a method of manufacturing an absorbent body including a sheet by joining and bonding a belt-like sheet immediately after spraying an absorbent polymer (see Patent Document 1). Hereinafter, the absorbent polymer is also simply referred to as a polymer.

JP 2002-178429 A

  However, the technique described in Patent Document 1 may not be employed depending on the configuration of the absorber.

  Therefore, an object of the present invention is to manufacture an absorber that can prevent the deposition and movement of a polymer to a portion that does not need to be deposited, and can stably manufacture an absorber having a clear outline of the portion on which the polymer is deposited. It is to provide a method.

  The present invention includes a step of spraying an absorbent polymer on a fiber assembly to be conveyed, a belt is joined to a polymer spray surface of a fiber assembly immediately after spraying, and the fiber assembly is compressed in the thickness direction by the belt. A step, wherein the pressing surface of the belt and the placement and conveyance surface of the fiber assembly are substantially parallel, and the fiber assembly is compressed between the substantially parallel pressing surface and the placement and conveyance surface Maintaining the state, and gradually increasing the distance between the pressing surface of the belt and the placing and conveying surface of the fiber assembly to separate the belt from the fiber assembly. The object is achieved by providing a manufacturing method of the absorbent.

  According to the method for manufacturing an absorber of the present invention, it is possible to prevent the polymer from being deposited or moved to a portion that does not need to be deposited, and it is possible to stably manufacture an absorber having a clear outline of the portion where the polymer is deposited. .

The present invention will be described below based on preferred embodiments with reference to the drawings.
The manufacturing method of the absorbent body which is one embodiment of the present invention includes the step of spraying the absorbent polymer 2 on the transported fiber assembly 21, the belt 51 on the polymer spray surface 22 of the fiber assembly 21 immediately after spraying. The step of joining and compressing the fiber aggregate 21 in the thickness direction by the belt 51, and the pressing surface 51a of the belt 51 and the placement conveyance surface 57 of the fiber aggregate 21 are substantially parallel and substantially parallel. A step of maintaining the state in which the fiber assembly 21 is compressed between the pressing surface 51a and the placement conveyance surface 57; and the placement conveyance of the pressing surface 51a of the belt 51 and the fiber assembly 21 A step of gradually increasing the distance to the surface 57 to separate the belt 51 from the fiber assembly 21.

Hereinafter, the manufacturing method of this embodiment is explained in full detail.
FIG. 1 is a schematic view showing an absorbent body manufacturing apparatus used in the manufacturing method of an absorbent body according to the present embodiment, and FIG. 2 shows a main part (polymer dispersion section and its vicinity) of the manufacturing apparatus shown in FIG. It is an enlarged view shown.
The absorbent body manufacturing apparatus 1 used in the present embodiment, as shown in FIG. 1, includes a first sheet supply mechanism 20 that supplies a band-shaped fiber assembly 21 and a second sheet that supplies a band-shaped core wrap sheet 31. Sheet supply mechanism 30, polymer spraying device 40 for spraying the absorbent polymer 2 onto the fiber assembly 21, and the belt 51 is joined to the polymer spraying surface of the fiber assembly 21 to spread the absorbent polymer 2. The polymer scattering suppression mechanism 50 to suppress, the pulp pile fiber 65, the pulp pile fiber 65 which manufactures the fiber aggregate 21 after polymer dispersion | spread, and arrange | positions the pulp pile fiber 65 (refer FIG. 3), and core wrap The folding guide 70 for turning back both sides of the sheet 31 onto the pulp piled body 65, the press device 80 for pressing between the upper and lower surfaces of the obtained absorbent body continuum 4 ′, and the absorbent body continuum 4 ′ intermittently. Cutting to cut And a location 90. The pulp pile 65 may be a pulp / polymer mixture containing an absorbent polymer.

  The first sheet supply mechanism 20 feeds the belt-like fiber aggregate 21 from the roll-shaped raw fabric 22 and feeds the fed fiber aggregate 21 onto the vacuum conveyor 55 arranged to face the polymer spraying device 40. . The second sheet supply mechanism 30 feeds out a core wrap sheet 31 having a width that is at least twice that of the fiber assembly 21 from a roll-shaped raw fabric 32, and applies adhesive to one side of the fed core wrap sheet 31. A hot melt adhesive is applied by the machine 33 and then supplied onto the vacuum conveyor 55. As shown in FIG. 2, the fiber aggregate 21 and the core wrap sheet 31 supplied on the vacuum conveyor 55 are arranged such that the fiber aggregate 21 is on the polymer spraying device 40 side and the core wrap sheet 31 is on the vacuum conveyor 55 side. In the laminated state, the polymer is transported to the polymer spraying unit 3 which is a part to spray the absorbent polymer.

  As shown in FIG. 2, the polymer spraying device 40 includes a cylindrical casing (first cylindrical body) 43 having a polymer inlet 41 and a polymer spraying port 42 and disposed substantially horizontally, A cylindrical rotor (second cylinder) having a rectangular recess 44 in plan view on the outer peripheral surface, and having the same axis as that of the casing 43 and being rotatable around the axis in the casing 43. And the supply means 46 for supplying the absorbent polymer 2 to the outer peripheral surface of the rotor 45 through the introduction port 41.

The spray port 42 is formed in a rectangular shape in plan view, and has an opening shape of the spray port 42 (particularly, a shape of an edge that releases the absorbent polymer 2 from the outer peripheral surface of the rotor 45) and a concave portion of the rotor 45. The dispersion pattern of the polymer 2 is determined by the shape of 44. The casing 43 is supported by a hollow support body (not shown) at the back surface, and a rotating shaft body (not shown) of the rotor 45 is disposed in the support body. A plurality of protrusions (projections) 44 a (see FIG. 2) having a triangular cross section extending in the longitudinal direction of the rotor 45 are formed in the recess 44 of the rotor 45.
A rectangular opening 45 a in plan view is formed in the peripheral wall portion of the rotor 45, and a part of the absorbent polymer 2 supplied from the supply means 46 (polymer that is not sprayed) is held in the recess 44. Instead, it is allowed to drop through the opening 45a. In the rotor 45, a collection hood (collector) 47 that collects the polymer falling from the opening 41 is disposed. When the opening 45a of the rotor 45 reaches below the introduction port 41 of the casing 43, the polymer that is not sprayed falls to the collection hood 47 and is collected.

  When the polymer spraying device 40 is operated, the absorbent polymer 2 is supplied to the outer peripheral surface of the rotor 45 (more specifically, in the concave portion 44) through the introduction port 41 by the supply means 46, and the supplied polymer 2 is A predetermined spray pattern (rectangular intermittent spraying) is carried on the fiber assembly 21 which is transported to the spraying port 42 by the rotation of the rotor 45 and continuously transported from the spraying port 42 below the spraying port 42. ). The details of the polymer spraying device 1 used in this embodiment are described in JP-A-8-215629.

As shown in FIG. 2, the polymer scattering suppression mechanism 50 is driven by an endlessly connected belt 51 and an arbitrary power device such as a motor, and the belt 51 is continuously moved in the direction of the arrow 52 in FIG. And a plurality of driven rolls 54 a to 54 e that rotate in conjunction with the movement of the belt 51. Each of the drive roll 53 and the driven rolls 54 a to 54 e extends in a direction in which the rotation axis of the roll is orthogonal to the moving direction of the fiber assembly 21 and parallel to the placement conveyance surface 57 of the fiber assembly 21. Yes.
Further, the belt 51 has a width wider than the spreading width of the absorbent polymer to the fiber assembly 21, and specifically has a width equal to or larger than the width of the fiber assembly 21.

One surface of the belt 51 is a pressing surface 51 a that presses the fiber assembly 21 from above. The pressing surface 51a is in contact with the polymer distribution surface of the fiber assembly 21 (the surface of the fiber assembly on which the polymer is distributed) and presses the fiber assembly 21 from the polymer distribution surface 21a side.
The material of the belt 51 is not particularly limited. It is preferable that the pressing surface 51a such as steel, Teflon (registered trademark), or fluorine resin is a material that hardly adheres to the absorbent polymer, fibers, or the like. It is preferable that the shape of the belt 51 does not have a hole through which the absorbent polymer 2 passes. The pressing surface 51a of the belt 51 is more preferably a smooth surface without unevenness.

  In the present manufacturing apparatus 1, after the belt 51 joins the polymer spray surface 21 a of the fiber assembly 21 just after the absorbent polymer is sprayed, the pressing surface 51 a of the belt 51 and the placement and transportation of the fiber assembly 21. As the surface 57 gradually approaches, the fiber assembly 21 is configured to be compressed in the thickness direction. The placement conveyance surface 57 of the fiber assembly 21 is a surface facing the belt 51 in the means for conveying the fiber assembly 21, and in this embodiment, the fiber assembly on the belt 56 of the vacuum conveyor 55. The surface 57 directed to the 21 side is the placement conveyance surface 57 of the fiber assembly 21.

  The pulp stacking machine 60 sucks and deposits the pulp fibers 61 in a scattered state into a collecting recess (not shown) formed on the peripheral surface portion of the rotary drum 62, and the pulp stacking fibers composed of the deposited pulp fibers 61 and the like. The body is transported to the release part 63 of the pulp pile. Then, the pulp product is released from the accumulation recess at the release part 63, and is laminated as a pulp product 65 (see FIG. 3) on the fiber aggregate 21 after the dispersion of the polymer. In the flow direction of the fiber assembly 21, an adhesive application machine 64 is provided upstream from the portion where the pulp pile fiber 65 is laminated, and the polymer application of the fiber assembly 21 coated with the adhesive is applied. The pulp pile fiber body 65 is laminated on the surface 21a, and joined through an adhesive.

The folding guide 70 folds the portion of the core wrap sheet 31 that extends from both side edges of the fiber aggregate 21 onto the pulp aggregate 65 after the pulp aggregate 65 is laminated on the fiber aggregate 21.
The press device 80 includes a pair of rolls 81 and 82, and an absorbent body continuous body 4 ′ having a configuration in which the fiber assembly 21 and the pulp pile fiber body 65 are covered with the core wrap sheet 31 is provided between the rolls 81 and 82. Compress between.
The cutting device 90 includes a cutter roll 91 having a blade on the peripheral surface and an anvil roll 92 having a smooth surface, and cuts the absorbent body continuous body 4 ′ introduced between both the rolls 91 and 92 in the width direction at a predetermined interval. To do.

The manufacturing method of the absorber 4 using the manufacturing apparatus of the absorber mentioned above is demonstrated.
As shown in FIG. 1, the fiber assembly 21 and the core wrap sheet 31 are supplied onto a vacuum conveyor 55 by the first and second sheet supply mechanisms 20 and 30. Then, the absorbent polymer 2 is sprayed by the polymer spraying device 40 onto the fiber assembly 21 continuously conveyed along with the core wrap sheet 31 by the belt 56 of the vacuum conveyor 55. In the present embodiment, the absorbent polymer 2 is intermittently dispersed in a region having a predetermined width in the center of the fiber assembly 21. By this dispersion, the fiber aggregate 21 is alternately formed with portions where the absorbent polymer is deposited and portions where the absorbent polymer is not deposited. The rectangular shape in plan view of the portion where the absorbent polymer is deposited is rectangular.

In this way, the belt 51 is merged onto the polymer distribution surface 21a of the fiber assembly 21 immediately after the absorbent polymer 2 is distributed. Then, the fiber assembly 21 is compressed in the thickness direction by the belt 51 (see A part in FIG. 2).
By causing the belt 51 to merge onto the fiber assembly 21 immediately after the absorbent polymer 2 is sprayed, the scattered polymer 2 can be effectively suppressed from scattering due to the polymer assembly 21 colliding with and rebounding from the fiber assembly 21. In addition, it is possible to effectively suppress the boundary between the portion where the polymer is moved and the polymer is deposited and the portion where the polymer is not deposited due to vibration or the like during conveyance of the fiber assembly.

The belt 51 when merging on the fiber assembly 21 has an inclination angle θ1 (see FIG. 2) with respect to the upper surface of the fiber assembly 21 of 15 to 90 degrees, particularly 30 to 45 degrees. It is preferable from the point of suppressing. Alternatively, the belt 51 when joining on the fiber assembly 21 may have the rolls 54 a and 54 b as one roll and may join together on the roll without having an inclination angle with respect to the upper surface of the fiber assembly 21.
Also, a deposition start position (position where the polymer 2 reaches the fiber assembly 21) P where the polymer 2 starts to deposit on the fiber assembly 21 and a point Q where the belt 51 first contacts the fiber assembly 21; The distance L between them (see FIG. 2) is preferably more than 0 mm and 50 mm or less, more preferably more than 0 mm and 30 mm or less from the viewpoint of suppressing scattering of the polymer. However, the position of the point Q varies depending on the height of the polymer spraying device.

Next, the pressing surface 51a of the belt 51 (the surface that comes into contact with the fiber assembly) and the mounting / conveying surface 57 of the fiber assembly 21 are substantially parallel, and the pressing surface 51a and the mounting / conveying surface 57 that are substantially parallel to each other. The state in which the fiber assembly 21 is compressed between is maintained for a predetermined time (see part B in FIG. 2).
By maintaining such a state, it is possible to effectively prevent the absorbent polymer from jumping up when the belt 51 is separated from the fiber assembly 21.
When the pressing surface 51a of the belt 51 and the placement conveyance surface 57 of the fiber assembly 21 are substantially parallel, as shown in FIG. 2, a cross section along the flow direction of the fiber assembly 21 (see FIG. 2) is used. When viewed, the pressing surface 51a of the belt 51 and the placement / conveying surface 57 of the fiber assembly 21 are completely parallel to each other, and the pressing surface 51a of the belt 51 and the placing / conveying surface 57 of the fiber assembly 21. And the case where the angle between and is 5 degrees or less. The angle formed between the pressing surface 51a of the belt 51 and the placing and conveying surface 57 of the fiber assembly 21 is preferably 5 degrees or less, and more preferably 3 degrees or less.

  The length L1 (see FIG. 2, the length in the flow direction of the fiber assembly) of the portion in which the pressing surface 51a of the belt 51 and the placement conveyance surface 57 of the fiber assembly 21 are substantially parallel is 5 cm or more, In particular, the thickness is preferably 10 cm or more from the viewpoint of stably and efficiently fixing the polymer. The upper limit of the length L1 is not particularly limited, but is preferably 100 cm or less, particularly 50 cm or less, from the viewpoint of preventing reduction in pressing due to the looseness of the belt. Note that the pressing surface 51a of the belt 51 and the placing and conveying surface 57 of the fiber assembly 21 are both flat between the roll 54b and the roll 54c in the flow direction of the fiber assembly 21. The pressing surface 51a of the belt 51 between the roll 54b and the roll 54c is horizontal. Further, one or more rolls may be added between the roll 54b and the roll 54c in order to assist in reducing the belt pressure.

  The time during which the fiber assembly 21 that is continuously transported is compressed between the pressing surface 51a and the placement transport surface 57 that are substantially parallel (hereinafter, also referred to as compression holding time) is the length L1; It is determined based on the flow speed of the fiber assembly 21 (same as the moving speed of the loading and conveying surface 57).

  In the step of maintaining the state in which the fiber assembly 21 is compressed between the pressing surface 51a and the placement transport surface 57 that are substantially parallel, the thickness T2 of the fiber assembly 21 is set to the fiber assembly before compression. It is preferable to maintain a state compressed to a thickness of 1/10 to 9/10 with respect to the thickness T1 of the body 21 from the viewpoint of reliably obtaining the effects of the present invention. From the same viewpoint, the ratio (T2 / T1) is more preferably 3/10 to 7/10.

As described above, after maintaining the state in which the fiber aggregate 21 is compressed between the substantially parallel pressing surface 51a and the placing and conveying surface 57 for a predetermined time, the pressing surface 51a of the belt 51 and the fiber assembly The belt 51 is moved away from the fiber assembly 21 by gradually increasing the distance of the body 21 from the placing and conveying surface 57 (see section C in FIG. 2). By separating the belt 51 from the fiber assembly 21 in this manner, it is possible to effectively prevent the absorbent polymer from jumping up when the belt 51 is separated from the fiber assembly 21.
Such an effect is remarkable when the fiber assembly is rich in compression recovery force, particularly when it is a nonwoven fabric.
The belt 51 when leaving the fiber assembly 21 is in a state of being stretched between the roll 54c and the roll 53, and has a planar shape.
The belt 51 at the time of leaving the fiber assembly 21 has an inclination angle θ2 (see FIG. 2) with respect to the placement conveyance surface 57 of the fiber assembly 21 of 5 to 45 degrees, particularly 10 to 30 degrees. Is preferable from the viewpoint of preventing the absorbent polymer from jumping up.

  According to the present embodiment, in this way, the belt is joined and compressed onto the fiber assembly immediately after the dispersion of the polymer, and the pressing surface 51a of the belt 51 and the fiber assembly 21 are placed and conveyed substantially parallel to each other. After maintaining the state in which the fiber assembly 21 is compressed with respect to the surface 57, the distance between the pressing surface 51 a of the belt 51 and the placing and conveying surface 57 of the fiber assembly 21 is gradually increased to remove the belt 51. By separating from the fiber assembly 21, scattering and movement of the polymer at the time of and after the application of the absorbent polymer can be suppressed. Such an effect is particularly useful when the moving speed of the fiber assembly 21 is high and polymer scattering is likely to occur. The moving speed of the fiber assembly 21 can be set to, for example, 100 to 400 m / min, and is preferably 150 to 300 m / min from the viewpoint of preventing scattering of the polymer and preventing movement during transportation.

  In the present embodiment, the moving speeds of the fiber assembly 21 and the belt 51 are set to substantially the same speed. By setting the moving speed to substantially the same speed, the contour of the portion where the polymer is deposited can be clearly clarified. When the moving speed of the fiber assembly 21 and the moving speed of the belt 51 are substantially the same speed, the case where the speed difference between the two is less than 0.5% is included.

On the other hand, it is also preferable to give a speed difference of 0.5 to 5% to the moving speed of the fiber assembly 21 and the belt 51. By providing the speed difference, the polymer can be displaced during compression, the polymer can be satisfactorily penetrated between the fibers of the fiber assembly, and the polymer can be recovered when the belt 51 is separated and the fiber assembly 21 is recovered. 2 becomes difficult to jump out.
The speed difference is a speed difference in a portion where the pressing surface 51a of the belt 51 and the placement conveyance surface 57 of the fiber assembly 21 are substantially parallel, and the speed is the same regardless of which of the belt 51 and the fiber assembly 21 is fast. If there is a difference, the same effect can be obtained. The speed difference between the moving speeds of the fiber assembly 21 and the belt 51 is more preferably 1 to 3%.

In the manufacturing method of the absorbent body of the present embodiment, as shown in FIG. 1, an adhesive is applied to the fiber assembly 21 after passing the arrangement site of the polymer scattering suppression mechanism 50 by an adhesive application machine 64. Then, a pulp laminate 65 (see FIG. 3) is laminated on the adhesive coated surface of the fiber assembly 21 by the pulp stacking machine 60, and then the fiber assembly 21 of the core wrap sheet 31 is folded by the folding guide 70. The portions extending outward from both side edges are folded back onto the pulp pile fiber body 65, and the resulting absorbent continuous body 4 ′ is compressed by being sandwiched between a pair of rolls 81 and 82 of the press device 80. By this compression, the bonding state between the members by the adhesive is stabilized.
And absorber continuous body 4 'is introduce | transduced between the cutter roll 91 and the anvil roll 92 in the cutting device 90, and absorber continuous body 4' is cut | disconnected to predetermined length, and each absorbent article's Absorbers 4, 4 ... are obtained.

  FIG. 3 is a view showing a cross-section in the width direction of the absorbent body 4 obtained according to the present embodiment. The absorbent body 4 includes a fiber aggregate 21 containing the absorbent polymer 2 and a pulp product as shown in FIG. The absorbent core 4 </ b> A having a configuration in which the fine body 65 is laminated is covered with the core wrap sheet 31. In the absorbent body 4, the surface of the fiber aggregate 21 on the pulp pile body 65 side is a polymer spray surface 21 a. The absorbent body 4 is incorporated into the absorbent article such that the fiber assembly 2 side (upper side in FIG. 3) of the fiber assembly 2 and the pulp pile fiber body 65 is located on the side closer to the wearer's skin. Are preferably used.

In the present invention, a sheet made of a fiber material such as a nonwoven fabric, paper, or cloth that can hold the absorbent polymer in the gaps between the fibers is preferably used as the fiber assembly to which the absorbent polymer is dispersed. The fiber aggregate is preferably one that can keep the polymer dispersed in the thickness direction. When the nonwoven fabric is used as the fiber assembly, a nonwoven fabric produced by various manufacturing methods can be used, and an air-through nonwoven fabric, an airlaid nonwoven fabric, a chemical bond nonwoven fabric, a spunlace nonwoven fabric, or the like can be used.
As the absorbent polymer and the core wrap sheet 31, those conventionally used for absorbent bodies in absorbent articles such as disposable diapers and sanitary napkins can be used without particular limitation. As the core wrap sheet 31, for example, paper, nonwoven fabric, a laminate of these, etc. having air permeability and liquid permeability are preferably used. As the nonwoven fabric when a nonwoven fabric is used as the core wrap sheet 31, a nonwoven fabric in which a polymer easily enters is preferable.

  Examples of the adhesive applied by the adhesive coating machine 33 or 64 include polyvinyl acetate, PVA (polyvinyl alcohol), cellulose derivatives, aqueous adhesives such as starch aqueous solution, acrylic acid, acrylic ester, EVA, SBR, Examples thereof include emulsion adhesives such as NBR and urethane, solvent adhesives, water dispersion adhesives, and wax compounds. In addition, the adhesive can be sprayed in a net-like, spiral-like, strip-like, striped, string-like, dot-like or film-like shape using a device such as a spray gun or roll coater.

According to the absorber manufacturing method of the present embodiment, it is possible to stably manufacture an absorber in which the polymer is deposited and moved to a portion that does not need to be deposited, and the contour of the polymer deposited portion is clear. it can. In addition, the polymer can be prevented from falling off due to scattering and movement, and the polymer can be prevented from being wasted.
In addition, when the outline of the part in which the polymer is deposited in the absorber is clear, for example, (1) it is possible to prevent an increase in the cost of the polymer material by using the amount of the polymer material having only the required shape. (2) When applied to disposable diapers, napkins and the like, the polymer can be prevented from spilling from the cut portion when it is cut into a predetermined length. (3) In the detection system such as the confirmation of the phase of the polymer and the confirmation of the spray shape in the production process, the accuracy of the detection system can be increased, and high-quality and high-speed production can be stabilized. There are advantages such as.

As mentioned above, although one Embodiment of this invention was described, this invention is not restrict | limited to the said embodiment, It can change suitably.
For example, the present invention is particularly useful for manufacturing an absorbent body having a configuration in which the polymer dispersion surface 21a of the fiber assembly 21 is not directly covered with the core wrap sheet 31 like the absorbent body 4 described above. As shown to (a), the absorber of the structure which directly coat | covered the polymer dispersion surface 21a of the fiber assembly 21 with the core wrap sheet | seat 31 can also be manufactured. Further, it is not necessary to laminate the pulp pile fiber body 65. As shown in FIG. 4B, an absorbent body having a configuration in which only the fiber aggregate 21 including the absorbent polymer 2 is covered with the core wrap sheet 31 is used. It can also be manufactured. Moreover, the core wrap sheet | seat 31 can also use a separate sheet | seat for the one surface and the other surface of the absorber 4. FIG. In addition, the pulp product 65 may be a mixed product of pulp and absorbent polymer.

  In the above-described embodiment, the fiber assembly 21 is continuously conveyed by the belt 56 of the vacuum conveyor 55, and sucked from the back side of the belt 56 by the vacuum box 58, while the fiber assembly 21 by the polymer scattering suppression mechanism 50. However, the dispersion of the polymer and the compression and release of the fiber assembly 21 by the scattering suppression mechanism 50 may be performed in a state where such suction is not performed.

Further, as in the above-described embodiment, the fiber assembly to which the absorbent polymer is dispersed has a predetermined length between adjacent fiber assemblies instead of a continuous belt-like fiber assembly. It may be one that is opened and continuously conveyed.
Further, the absorbent polymer may be continuously sprayed in the flow direction instead of intermittently spraying in the flow direction of the fiber assembly. Moreover, the width | variety which spreads an absorptive polymer may be substantially the same width as the full width of a fiber assembly, and may be a width narrower than the width of a fiber assembly. In addition, when the absorbent polymer is intermittently dispersed in the lengthwise direction of the fiber assembly, the polymer dispersion shape may be any shape such as a rectangle, a square, a circle, an ellipse, a rhombus, a triangle in plan view. It can be.

FIG. 1 is a schematic diagram showing an absorbent body production apparatus preferably used for carrying out the absorbent body production method of the present invention. FIG. 2 is an enlarged view showing a main part (polymer dispersion part and its vicinity) of the manufacturing apparatus shown in FIG. FIG. 3 is a cross-sectional view showing an absorbent body manufactured in one embodiment of the present invention. FIG. 4 is a cross-sectional view (corresponding to FIG. 3) showing an absorbent body manufactured in another embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Absorbent body manufacturing apparatus 2 Absorbent polymer 3 Polymer dispersion part 4 Absorber 21 Fiber aggregate 21 Polymer dispersion surface 31 Core wrap sheet 50 Polymer scattering suppression means 51 Belt 51a Pressing surface 55 Vacuum conveyor 57 Loading conveyance surface 65 Pulp product Fiber

Claims (6)

A step of dispersing the absorbent polymer on the fiber assembly to be conveyed;
A step of joining an endless belt on the polymer spreading surface of the fiber aggregate immediately after spreading so that the belt is in direct contact with the polymer spreading face, and compressing the fiber aggregate in the thickness direction by the belt;
A state in which the pressing surface of the belt and the placing and conveying surface of the fiber assembly are substantially parallel, and the fiber assembly is compressed between the pressing surface and the placing and conveying surface that are substantially parallel to each other. Maintaining, and
Gradually increasing the distance between the pressing surface and the mounting conveying surface of the fiber assembly of the belt, the belt is immediately Bei the step of releasing the fiber aggregate or al,
The step of separating the belt from the fiber assembly is performed by setting the inclination angle θ2 of the belt when leaving the fiber assembly to the placement conveyance surface of the fiber assembly as 5 to 45 degrees.
Manufacturing method of absorber. When joining the endless belt on the polymer spreading surface, the belt is inclined so as to approach the placement conveyance surface from the upstream side to the downstream side in the flow direction of the fiber assembly. The method for manufacturing an absorbent body according to claim 1, wherein the portion that is made to contact is first brought into contact with the fiber assembly. The method for manufacturing an absorbent body according to claim 1 or 2 , wherein the moving speed of the fiber assembly and the belt is substantially the same. The method for producing an absorbent body according to claim 1 or 2 , wherein the moving speed of the fiber assembly and the belt has a speed difference of 0.5 to 5%. The said fiber assembly is a nonwoven fabric, The manufacturing method of the absorber in any one of Claims 1-4 . In the step of making the pressing surface of the belt and the placing and conveying surface of the fiber assembly substantially parallel, and maintaining the compressed state of the fiber assembly between the pressing surface and the placing and conveying surface, the thickness of the fiber aggregate, to maintain the state of being compressed to a thickness of 1 / 10-9 / 10 of the thickness of the fiber aggregate before compression, absorption of any one of claims 1 to 5 Body manufacturing method.

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