Absorbent body manufacturing device and absorbent body manufacturing method

Abstract

The present invention provides an absorbent manufacturing device and an absorbent manufacturing method, which can prevent the dispersion of absorbent material during the process of spraying absorbent material onto the bottom layer. The substrate (2) in the present invention is transported along the rotating outer peripheral surface (12s) of the conveying roller (12). The granular absorbent (8) is discharged from the injection port (32) of the injector (30) facing the outer peripheral surface (12s) of the conveying roller (12), and the absorbent (8) is sprayed onto the substrate (2) transported along the outer peripheral surface (12s) of the conveying roller (12). The injection position of the absorbent (8) onto the bottom layer (2) is controllable. For example, the position of the injection port (32) of the injector (30) is controlled or the discharge angle of the absorbent (8) discharged from the injection port (32) of the injector (30) is controlled.

Description

Technical Field

[0001] The present invention relates to an absorbent body manufacturing apparatus and an absorbent body manufacturing method, and more particularly to a technology for manufacturing an absorbent body by spraying an absorbent material onto a substrate. Background Art

[0002] An absorbent body comprising an absorbent material capable of absorbing and retaining liquids is used in absorbent articles such as disposable diapers, disposable pants, sanitary napkins and incontinence pads.

[0003] For example, by using Figure 6 The absorbent manufacturing apparatus shown in the schematic structural diagram of the manufacture of absorbent bodies. Figure 6 As shown, a substrate 101 is conveyed along the outer peripheral surface 141 of a rotating conveyor drum 104. Conveyor drum 104 draws air from the outside to the inside through outer peripheral surface 141. Granular absorbent 103 is stored in a sprayer tank 105 and drips onto conveyor drum 104 bit by bit. As substrate 101 passes through area 104 where absorbent 8 drips, absorbent 8 is sprayed onto substrate 101. A coating sheet 102 is applied to substrate 101, onto which absorbent 8 has been sprayed, and the coating sheet 102 and substrate 101 are ultrasonically bonded together by an ultrasonic horn 193, thereby forming an absorbent body 120 (see, for example, Patent Document 1).

[0004] Patent document: JP 2015-19908A Summary of the Invention

[0005] The object of the present invention is to provide an absorbent body manufacturing apparatus and an absorbent body manufacturing method, which adjusts the suction pressure to capture the absorbent that has reached the substrate when manufacturing the absorbent by spraying the absorbent onto the substrate conveyed by a conveying roller.

[0006] However, when the arrival position (injection position) of the absorbent is not appropriate, the absorbent may bounce off the substrate, making it impossible to suppress the dispersion of the absorbent even if the suction pressure is adjusted.

[0007] In addition, for example, when the rotation speed of the conveying roller increases, the absorbent material deviates from the arrival position (injection position) due to the airflow generated in the rotation direction of the roller, so when the substrate is bounced off, even if the suction pressure is adjusted, the dispersion of the absorbent material cannot be suppressed.

[0008] In view of such circumstances, an object of the present invention is to provide an absorbent body manufacturing apparatus and an absorbent body manufacturing method capable of suppressing dispersion of the absorbent during the process of spraying the absorbent onto a substrate.

[0009] The technical solution of the present invention is:

[0010] In order to solve the above problems, the present invention provides an absorbent manufacturing device, the structure of which is as follows:

[0011] An absorbent manufacturing device is provided with: (a) a conveyor roller having a rotating cylindrical outer peripheral surface and conveying a substrate along the outer peripheral surface; (b) an injector having an injection port facing the outer peripheral surface of the conveyor roller, discharging granular absorbent from the injection port, and injecting the absorbent onto the substrate conveyed along the outer peripheral surface of the conveyor roller so that only the granular absorbent is captured by the substrate; and (c) an injection position control device for controlling the injection position of the absorbent onto the substrate, wherein the injection position control device includes: an injection position changing device for changing the injection position of the granular absorbent; a detection device for detecting the injection position or injection condition of the absorbent; and a control device for controlling the injection position changing device while monitoring the injection position or injection condition of the absorbent detected by the detection device, wherein the control device of the injection position control device controls the injection position so that when the angle θ formed by a horizontal plane and a straight line perpendicular to the rotation center line of the conveyor roller and passing through the injection position is 0°≤θ≤60°.

[0012] According to the above configuration, the discharge position of the absorbent sprayed onto the substrate can be controlled to suppress the absorbent from being scattered during the spraying of the absorbent onto the substrate.

[0013] In the above structure, the absorbent may be sprayed to the area where the outer peripheral surface of the conveying roller moves downward, or the absorbent may be sprayed to the area where the outer peripheral surface of the conveying roller moves upward.

[0014] Preferably, the control device of the injection position control device controls the injection position so that when the angle formed by the horizontal plane and the straight line perpendicular to the rotation center line of the conveying roller and passing through the injection position is θ, the angle θ is within a predetermined range satisfying 0°≤θ≤60°.

[0015] At this point, the sprayed absorbent material is easily captured in the substrate.

[0016] The above-mentioned angle θ includes not only the angle θ shown in the first and second embodiments described later, but also the angle θ′ shown in the first variation described later.

[0017] More preferably, the control device of the injection position control device controls the injection position so that θ=45° is included in a predetermined range of the angle θ.

[0018] At this point, the sprayed absorbent material is more easily captured in the substrate.

[0019] Preferably, the control device of the injection position control device controls the position of the injection port of the injector, or controls the discharge angle of the absorbent discharged from the injection port of the injector.

[0020] In this case, it is easy to control the spraying position of the absorbent.

[0021] Furthermore, in order to solve the above problems, the present invention also provides a method for manufacturing an absorbent body:

[0022] A method for manufacturing an absorbent body includes: (i) a conveying step of conveying a substrate along the rotating outer peripheral surface of a conveyor roller; and (ii) a spraying step of discharging granular absorbent material from a spray port facing the outer peripheral surface of the conveyor roller and spraying the absorbent material onto the substrate conveyed along the outer peripheral surface of the conveyor roller, so that only the granular absorbent material is captured by the substrate. In the spraying step, a spray position control device controls the spray position of the absorbent material onto the substrate. The spray position control device includes a control device that controls a spray position changing device while monitoring the spray position or spraying status of the absorbent material detected by a detection device. The control device of the spray position control device controls the spray position so that when an angle θ formed by a horizontal plane and a straight line perpendicular to the rotational center line of the conveyor roller and passing through the spray position is θ, the angle θ is within a predetermined range satisfying 0°≤θ≤60°.

[0023] According to the above method, the spraying position of the absorbent onto the substrate can be controlled to suppress the absorbent from being scattered during the spraying of the absorbent onto the substrate.

[0024] In a preferred embodiment, the outer peripheral surface of the conveyor drum is air-permeable. The substrate comprises: (a) an air-permeable support sheet, which is conveyed along the outer peripheral surface of the conveyor drum; and (b) a pulp layer, wherein pulp that has been pulverized and conveyed through a pipe is extracted and laminated onto the support sheet in a predetermined fiber pattern. In the spraying step, the absorbent is sprayed onto the pulp layer.

[0025] In another preferred embodiment, the substrate comprises a nonwoven fabric sheet conveyed along the outer circumferential surface of the conveyor roller. During the spraying step, the absorbent material is sprayed onto one major surface of the nonwoven fabric sheet. During the conveying step, the nonwoven fabric sheet includes a bulky structure that constitutes at least a portion of the one major surface and has gaps for the absorbent material to enter.

[0026] According to the present invention, dispersion of the absorbent can be suppressed during the process of spraying the absorbent onto the substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the absorbent body manufacturing device according to Example 1 of the present invention.

[0028] Figure 2 This is a schematic diagram of the relevant parts of the absorbent body manufacturing device in Example 1 of the present invention.

[0029] Figure 3 This is a block diagram of the absorbent body manufacturing device according to Example 1 of the present invention.

[0030] Figure 4 This is a schematic diagram of an absorbent body manufacturing device according to Example 2 of the present invention.

[0031] Figure 5 Schematic diagram of the injection position in the present invention (Transformation 1).

[0032] Figure 6 Schematic diagram of the structure of a traditional absorber manufacturing device. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0034] Example 1: The absorbent manufacturing device 10 and the absorbent manufacturing method of the present invention are as follows: Figures 1 to 3 shown.

[0035] Figure 1 It is a structural schematic diagram of the absorbent body manufacturing device 10. Figure 2 FIG. 1 is a schematic diagram of a relevant part of the absorbent manufacturing device 10. Figure 1 and Figure 2 As shown, in the absorbent body manufacturing apparatus 10, a pipe 22 for forming a pulp layer 2b and an injector 30 for injecting granular absorbent material 8 into the formed pulp layer 2b are both provided around a conveying drum 12. The conveying drum 12 is conveyed in the direction indicated by arrow 12r; the first sheet 2a and the second sheet 4 are conveyed in the directions indicated by arrow 2x and arrow 4x, respectively; and the absorbent body 6 is conveyed in the direction indicated by arrow 6x.

[0036] The conveyor roller 12 has a cylindrical outer peripheral surface 12s and is arranged in a manner that the rotation center line 12x extends horizontally. The outer peripheral surface 12s of the conveyor roller 12 is air-permeable. For example, a large number of suction holes (not shown) are formed in a predetermined area of ​​the outer peripheral surface 12s. A suction box (not shown) is provided inside the conveyor roller 12, and within a predetermined range (for example, a range of approximately 180 degrees of the upper half of the conveyor roller 12), air is sucked from the outside to the inside through the outer peripheral surface 12s of the conveyor roller 12.

[0037] The first sheet 2 a is wound around the outer peripheral surface 12 s of the transport drum 12 by the first guide roller 14 , and is transported along the outer peripheral surface 12 s of the transport drum 12 .

[0038] One end of the pipe 22 has an opening 24 facing the outer peripheral surface 12s of the conveying drum 12; the other end thereof is connected to the pulverizer 20, and pulp (not shown) pulverized by the pulverizer 20 is conveyed to the opening 24 through the pipe 22. After being discharged from the opening 24, the pulverized pulp is sucked onto the first sheet 2a conveyed along the outer peripheral surface 12s of the conveying drum 12 in a predetermined pattern, thereby forming a fiber laminated pulp layer 2b (see FIG. Figure 2 ). The first sheet 2a and the pulp layer 2b are the base material 2 and are conveyed as a whole. The first sheet 2a is a supporting sheet 2a that supports the pulp layer 2b.

[0039] The ejector 30 has an ejection port 32 (see FIG. Figure 2 ), and discharges the granular absorbent material 8 (see Figure 2 The absorbent material 8 is, for example, a powdered or granular super absorbent resin (SAP). The granular absorbent material 8 discharged from the injection port 32 is injected onto the pulp layer 2b. The injector 30 may also be designed to inject a mixture of two or more absorbent materials.

[0040] The second sheet 4 is placed over the pulp layer 2b onto which the granular absorbent material 8 has been sprayed, by means of a second guide roller 16 and a press roller 17, thereby forming an absorbent body 6, wherein the pulp layer 2b onto which the absorbent material 8 has been sprayed is sandwiched between the first sheet 2a and the second sheet 4. The absorbent body 6 is compressed in the thickness direction while passing between the conveying drum 12 and the press roller 17, and is then conveyed to post-processing by means of a third guide roller 18.

[0041] Figure 3 FIG. 1 is a block diagram of the absorbent manufacturing apparatus 10. Figure 3 As shown, in the absorbent manufacturing apparatus 10, the following components are connected to a control device 50 that controls the entire absorbent manufacturing apparatus 10: a conveying motor 52 that rotates the conveying roller 12; a suction motor 54; an ejection motor 56 that drives the ejector 30; and an operating device 58 for operating the absorbent manufacturing apparatus 10. Furthermore, an ejection position changing device 60, a detection device 62, and a storage device 64, described later, are connected to the control device 50. The control device 50 is a control computer such as a sequencer.

[0042] like Figure 1As shown, the spraying position of the granular absorbent material 8 can be defined by an angle θ. Angle θ is formed by a horizontal plane H and a straight line L perpendicular to the rotational centerline 12x of the conveyor drum 12 and passing through a point P within the spraying position. The spraying position of the absorbent material 8, that is, angle θ, is preferably within a predetermined range satisfying 0°≤θ≤60°, and most preferably θ=45°.

[0043] The absorbent body manufacturing apparatus 10 provided with a spray position control device for controlling the spray position of the absorbent 8 can control the spray position of the granular absorbent 8 according to the manufacturing conditions of the absorbent body 6 .

[0044] For example, the injection position control device controls the position of the injection port 32 of the injector 30 or controls the discharge angle of the absorbent 8 discharged from the injection port 32 of the injector 30. In this case, the injection position control device includes: (a) an injection position changing device 60 (see FIG. 1 ) for changing the injection position of the granular absorbent 8; Figure 3 (b) detecting the injection position or injection situation of the absorbing material 8 by the detection device 62 (see Figure 3 ); and (c) a control device 50.

[0045] The spray position changing device 60 changes the position of the spray port 32 of the sprayer 30 relative to the outer peripheral surface 12s of the conveying roller 12; or changes the discharge angle of the absorbent 8 discharged from the spray port 32 of the sprayer 30 to the outer peripheral surface 12s of the conveying roller 12. In the case where the position of the spray port 32 of the sprayer 30 is changed, the spray position changing device 60 can at least Figure 1 The injection port 32 of the injector 30 can be moved in the vertical direction Z and / or the horizontal direction Y as shown. The injection port can be moved in a diagonal direction intersecting the vertical direction Z and the horizontal direction Y, or in an arc shape around the conveyor roller 12.

[0046] The detection device 62 is, for example, a camera for taking pictures of the injection position of the absorbent material 8 and its surroundings, or a sensor for detecting the injection range of the absorbent material 8 (for example, the angle θ of the injection position of the absorbent material 8) by means of sensor light passing near the injection position of the absorbent material 8.

[0047] The control device 50 controls the spray position changing device 60 so that the angle θ of the spray position of the absorbent 8 satisfies the predetermined range of 0°≤θ≤60°, while monitoring the spray position or spray condition of the absorbent 8 detected by the detection device 62 .

[0048] For example, when the rotation speed of the transport roller 12 is V1, the control device 50 controls the spray position changing device 60 so that the angle θ of the spray position of the absorbent 8 is not greater than 45°.

[0049] When the rotation speed of the conveying roller 12 becomes V2 (V2>V1) and the angle θ of the injection position of the absorbent 8 is reduced to no more than 30°, the control device 50 controls the injection position changing device 60 so that the angle θ of the injection position of the absorbent 8 is no more than 45°.

[0050] By controlling the spray position of the absorbent 8 by the spray position control device, it is possible to suppress the absorbent 8 from being dispersed during the spraying of the absorbent 8 onto the substrate 2 , thereby stabilizing the spraying of the absorbent 8 .

[0051] The spraying position control device can automatically control the spraying position of the absorbent 8 according to the manufacturing conditions of the absorbent body 6.

[0052] At this time, the injection position control means includes, for example, a storage means 64 (see FIG. Figure 3 ), that is, spray position information associated with the manufacturing conditions of the absorbent body 6. Examples of the manufacturing conditions of the absorbent body 6 include the rotation speed of the conveying drum 12, the type of absorbent material 8 to be sprayed, the spray amount and the spray form, and the type (for example, fluff in which pulverized pulp or the like is laminated with fibers or a non-woven fabric sheet is processed into a fluffy shape) and properties (for example, thickness and density) of the base material to which the absorbent material 8 is to be sprayed.

[0053] When the operating device 58 receives an input of a manufacturing condition such as the rotational speed of the conveying roller 12, the control device 50 of the injection position control device reads the injection position information pre-stored in association with the manufacturing condition whose input is received from the storage device 64, and controls the injection position changing device 60 so that the absorption material 8 is injected to the optimal injection position indicated by the read injection position information, while monitoring the injection position or injection condition of the absorption material 8 detected by the detection device 62.

[0054] As described above, by automatically controlling the spraying position of the absorbent 8 according to the manufacturing conditions of the absorbent body 6 , the manufacturing conditions of the absorbent body 6 can be easily changed.

[0055] The injection position control device can manually control the injection position through the operating device 58.

[0056] Next, the absorbent body manufacturing method of Example 1 using the absorbent body manufacturing apparatus 10 will be described.

[0057] The absorbent body manufacturing method according to Example 1 includes: (i) a conveying step of conveying a substrate 2 along a rotating outer peripheral surface 12s of a conveying drum 12; and (ii) a spraying step of discharging a granular absorbent 8 from a spray port 32 facing the outer peripheral surface 12s of the conveying drum 12 and spraying the absorbent 8 onto the substrate 2 conveyed along the outer peripheral surface 12s of the conveying drum 12. In the spraying step, the spraying position of the absorbent 8 onto the substrate 2 is controlled.

[0058] According to the above method, the spraying position of the absorbent 8 onto the substrate can be controlled to suppress the granular absorbent 8 from being dispersed during the spraying of the absorbent 8 onto the substrate 2 .

[0059] Specifically, the outer peripheral surface of the conveying roller is air-permeable. The substrate 2 comprises: (a) a first air-permeable sheet 2a conveyed along the outer peripheral surface 12s of the conveying roller 12; and (b) a pulp layer 2b, wherein pulp, pulverized and conveyed through a pipe 22, is sucked into and laminated onto the first sheet 2a in a predetermined fiber pattern. In the spraying step, the absorbent 8 is sprayed onto the pulp layer 2b.

[0060] Example 2: Figure 4 Hereinafter, the same components as those in Example 1 are denoted by the same reference numerals, and the differences from Example 1 are mainly described.

[0061] like Figure 4 As shown, in the absorbent body manufacturing apparatus 10 a of the second embodiment, as in the first embodiment, the ejectors 31 are provided around the conveying drum 12 .

[0062] Unlike Example 1, the nonwoven fabric sheet 3 is conveyed along the outer peripheral surface 12s of the conveying drum 12, and the granular absorbent 8 is sprayed onto one main surface 3s of the nonwoven fabric sheet 3. The other main surface 3t of the nonwoven fabric sheet 3 is supported by the outer peripheral surface 12s of the conveying drum 12.

[0063] The nonwoven fabric sheet 3 includes a bulky structure 3k, which forms at least a portion of the one main surface 3s and has gaps for the absorbent material 8 to enter. For example, the nonwoven fabric sheet 3 is raised along the one main surface 3s by a raising device (not shown), thereby forming the bulky structure 3k. While any suitable nonwoven fabric sheet, for example, an air-permeable nonwoven fabric, can be used as the nonwoven fabric sheet 3, the nonwoven fabric sheet 3 may also be a composite sheet formed by bonding two or more nonwoven fabric sheets together.

[0064] As in Example 1, the ejector 31 discharges the granular absorbent 8 from an ejection port (not shown) facing the outer peripheral surface 12s of the conveyor drum 12. The ejector 31 may be appropriately configured to discharge a mixture of two or more absorbents. The discharged absorbent 8 is ejected onto one main surface 3s of the nonwoven fabric sheet 3 being conveyed by the conveyor drum 12. At least some of the ejected absorbent 8 enters the bulky structure 3k of the nonwoven fabric sheet 3 from the one main surface 3s of the nonwoven fabric sheet 3.

[0065] Even if the structure of sucking air from the outside to the inside through the outer peripheral surface 12s of the conveying roller 12 is not adopted, the sprayed absorbent material 8 also enters the bulky structure 3k of the non-woven fabric sheet 3. However, the outer peripheral surface 12s of the conveying roller 12 is breathable, and the structure of sucking air from the outside to the inside through the outer peripheral surface 12s of the conveying roller 12 is a preferred structure because the sprayed absorbent material 8 can easily enter the bulky structure 3k of the non-woven fabric sheet 3.

[0066] The coating sheet 5 is placed over the nonwoven fabric sheet 3 onto which the absorbent material 8 has been sprayed, by means of the first guide roller 16a and the press roller 17a. An adhesive is pre-applied to one main surface of the coating sheet 5, which faces the nonwoven fabric sheet 3, by means of a first adhesive application device 40 provided upstream in the conveying direction of the press roller 17a. The nonwoven fabric sheet 3 and the coating sheet 5 are compressed while passing between the conveying drum 12 and the press roller 17a, thereby forming the absorbent body 7 in which the coating sheet 5 is bonded to the one main surface 3s of the nonwoven fabric sheet 3 onto which the absorbent material 8 has been sprayed.

[0067] For example, the width of the coating sheet 5 is greater than that of the nonwoven fabric sheet 3, and the coating sheet 5 is placed over the nonwoven fabric sheet 3 so that the coating sheet 5 protrudes on one or both sides in the width direction of the nonwoven fabric sheet 3. On the absorbent body 7, adhesive is applied to the portion of the coating sheet 5 protruding from the nonwoven fabric sheet 3 by the second adhesive applying device 42. Then, the portion of the coating sheet 5 protruding from the nonwoven fabric sheet 3 is folded by the folding device 44 so as to overlap with the other main surface 3t of the nonwoven fabric sheet 3. Then, when the absorbent body 7 passes between a pair of pressing rollers 46p and 46q in the directions indicated by arrows 46m and 46n, the absorbent body is compressed in the thickness direction.

[0068] The absorbent body 7 can be manufactured by covering the nonwoven fabric sheet 3 with the coating sheet 5 so that the coating sheet 5 does not protrude in the width direction of the nonwoven fabric sheet 3 .

[0069] Similar to the absorbent body manufacturing apparatus 10 of Example 1, the absorbent body manufacturing apparatus 10a of Example 2 is also provided with a spray position control device for controlling the spray position of the absorbent material 8, and is therefore also capable of controlling the spray position of the absorbent material 8. Therefore, during the process of spraying the absorbent material onto the material, it is possible to suppress the absorbent material from being scattered.

[0070] Example 2: A method for manufacturing an absorbent body using the absorbent body manufacturing apparatus 10a will be described below.

[0071] The absorbent body manufacturing method of Example 2 includes the same conveying and spraying steps as the absorbent body manufacturing method of Example 1. In the spraying step, the position at which the absorbent material is sprayed onto the substrate is controlled. However, unlike the absorbent body manufacturing method of Example 1, the substrate 3 comprises a nonwoven fabric sheet 3 that is conveyed along the outer peripheral surface 12s of a conveyor roller 12. In the spraying step, the absorbent material 8 is sprayed onto one major surface 3s of the nonwoven fabric sheet 3. During the conveying step, the nonwoven fabric sheet 3 includes a bulky structure 3k that forms at least a portion of one major surface 3s and has interstices for the absorbent material 8 to enter.

[0072] Transformation 1: Figure 5 is a schematic diagram of the injection position. In Example 1 and Example 2, as Figure 5 As shown, the absorbent is sprayed onto an area where the outer peripheral surface 12s of the conveying roller 12 rotates in the direction indicated by the arrow 12r and moves downward (for example, within a predetermined range satisfying 0°≤θ≤60°, where the angle θ is formed by the horizontal plane H and a straight line L perpendicular to the rotation center line 12x of the conveying roller 12 and passing through the point P within the spraying position), the absorbent can be sprayed onto an area where the outer peripheral surface 12s of the conveying roller 12 moves upward.

[0073] As in Examples 1 and 2, when the absorbent is sprayed onto the upwardly moving area of ​​the outer peripheral surface 12s of the conveyor drum 12, the spray position of the granular absorbent can be defined by an angle θ'. Angle θ' is formed by a horizontal plane H and a straight line L' perpendicular to the rotational centerline 12x of the conveyor drum 12 and passing through a point P' within the spray position. The absorbent spray position, i.e., angle θ', is preferably within a predetermined range satisfying 0° ≤ θ' ≤ 60°, with θ' = 45° being most preferred.

[0074] As described above, by controlling the spraying position of the absorbent 8 , it is possible to suppress the absorbent 8 from being dispersed during the process of spraying the absorbent 8 onto the substrate 2 or 3 .

[0075] The present invention is not limited to the above-described embodiments, and can be implemented with various modifications.

[0076] For example, the absorbent 8 may be sprayed intermittently. In this case, by cutting the absorbent body 6 or 7 in the region where the absorbent 8 is not sprayed, a single absorbent body 6 or 7 without overflowing the absorbent 8 can be formed.

[0077] Furthermore, the absorbent body 6 may be manufactured by folding one or both sides of the first sheet 2a and / or the second sheet 4 in the width direction in the first embodiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0079] 2. Substrate

[0080] 2A First sheet (support sheet)

[0081] 2B pulp layer

[0082] 3. Non-woven fabric sheet (base material)

[0083] 3K bulky structure

[0084] 3S One main surface

[0085] 5 Coating sheet

[0086] 6.7 Absorber

[0087] 8 Absorbent

[0088] 10.10a Absorbent manufacturing device

[0089] 12 conveyor rollers

[0090] 12S outer surface

[0091] 12X Rotation Centerline

[0092] 22 Pipeline

[0093] 24 Opening

[0094] 30,31 Injector

[0095] 32 jet nozzle

[0096] 50 Control device (injection position control device)

[0097] 58 Operating device (injection position control device)

[0098] 60 Injection position changing device (injection position control device)

[0099] 62 Detection device (injection position control device)

[0100] 64 Storage device (injection position control device)

Claims

1. An absorbent body manufacturing device, characterized in that: It includes: a conveying roller having a rotating cylindrical outer peripheral surface and conveying the substrate along the outer peripheral surface; an ejector having an ejection port facing the outer peripheral surface of the conveyor drum, discharging granular absorbent from the ejection port and ejecting the granular absorbent onto the substrate conveyed along the outer peripheral surface of the conveyor drum so that only the granular absorbent is captured by the substrate; and a spray position control device for controlling the spray position of the absorbent material onto the substrate, The injection position control device includes: an injection position changing device for changing the injection position of the granular absorbent; a detection device for detecting the injection position or injection condition of the absorbent; and a control device that controls the injection position changing device while monitoring the injection position or injection condition of the absorbent material detected by the detection device, wherein the control device of the injection position control device controls the injection position so that when an angle θ formed by a horizontal plane and a straight line perpendicular to the rotation center line of the conveying roller and passing through the injection position is θ, the angle θ is within a predetermined range satisfying 0°≤θ≤60°.

2. The absorbent body manufacturing device according to claim 1, wherein: The control device of the injection position control device controls the injection position so that θ=45° is included in a predetermined range of the angle θ.

3. The absorbent body manufacturing device according to any one of claims 1 to 2, characterized in that: The control device of the injection position control device controls the position of the injection port of the injector or controls the discharge angle of the absorbent discharged from the injection port of the injector.

4. A method for manufacturing an absorbent body, characterized in that: It includes: a conveying step of conveying the substrate along a rotating outer peripheral surface of a conveying roller; as well as a spraying step of discharging granular absorbent from a spray port facing the outer peripheral surface of the conveying drum and spraying the granular absorbent onto the substrate conveyed along the outer peripheral surface of the conveying drum so that only the granular absorbent is captured by the substrate; Wherein, in the spraying step, the spraying position of the absorbent material onto the substrate is controlled by a spraying position control device, and the spraying position control device includes a control device, which controls the spraying position changing device and simultaneously monitors the spraying position or spraying condition of the absorbent material detected by the detection device. The control device of the spraying position control device controls the spraying position so that when the angle formed by the horizontal plane and the straight line perpendicular to the rotation center line of the conveying roller and passing through the spraying position is θ, the angle θ is within a predetermined range satisfying 0°≤θ≤60°.

5. The method for manufacturing an absorbent body according to claim 4, wherein: The outer peripheral surface of the conveying roller is breathable; The substrate comprises: a breathable supporting sheet, the breathable supporting sheet being conveyed along the outer peripheral surface of the conveying roller; and a pulp layer in which pulp that has been pulverized and transported through a pipe is sucked in and laminated on the supporting sheet in a predetermined pattern of fibers, and In the spraying step, the absorbent is sprayed onto the pulp layer.

6. The method for manufacturing an absorbent body according to claim 4, wherein: The substrate includes a non-woven fabric sheet conveyed along the outer peripheral surface of the conveying roller; In the spraying step, the absorbent is sprayed onto one main surface of the nonwoven fabric sheet; and In the conveying step, the nonwoven fabric sheet includes a bulky structure constituting at least a portion of the one main surface and having gaps for the absorbent to enter.

Images