WO2011118492A1 - 吸収体の製造装置、及び製造方法 - Google Patents
吸収体の製造装置、及び製造方法 Download PDFInfo
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- WO2011118492A1 WO2011118492A1 PCT/JP2011/056367 JP2011056367W WO2011118492A1 WO 2011118492 A1 WO2011118492 A1 WO 2011118492A1 JP 2011056367 W JP2011056367 W JP 2011056367W WO 2011118492 A1 WO2011118492 A1 WO 2011118492A1
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- sap
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- superabsorbent polymer
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/15577—Apparatus or processes for manufacturing
- A61F13/15617—Making absorbent pads from fibres or pulverulent material with or without treatment of the fibres
- A61F13/15658—Forming continuous, e.g. composite, fibrous webs, e.g. involving the application of pulverulent material on parts thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/0005—Direct recuperation and re-use of scrap material during moulding operation, i.e. feed-back of used material
Definitions
- the present invention relates to an apparatus for manufacturing an absorbent body of an absorbent article such as a disposable diaper, and a manufacturing method.
- a disposable diaper etc. are known as an absorptive article which absorbs liquids, such as excretion fluid.
- This absorbent article has an absorber that absorbs liquid as its component.
- the absorbent body has a base material formed from liquid absorbent fibers such as pulp fibers in a predetermined shape, and a granular superabsorbent polymer is also mixed therein.
- the superabsorbent polymer is a polymer or the like having a high liquid holding performance due to swelling or the like due to liquid absorption.
- this polymer is also referred to as “SAP”.
- Such an absorbent body is formed, for example, by depositing pulp fibers in an air flow flowing through an appropriate spray duct on a deposition portion on the outer peripheral surface of the rotary drum.
- the accumulation portion has a large number of intake holes arranged in a predetermined arrangement pattern, and pulp fibers are accumulated in the substantially outer shape of the accumulation portion by the intake air to generate an absorber.
- a nozzle is also provided in the spray duct for supplying SAP, and SAP is discharged from the nozzle into the spray duct.
- SAP also rides on the air flow in a spreading
- SAP is very expensive compared to pulp fiber. For this reason, SAP cannot be wasted in order to reduce manufacturing costs.
- intake of the above-described intake holes is performed by suction of air through an intake duct communicating with the intake holes. Therefore, the SAP that has passed through the intake hole passes through the intake duct. Therefore, it is considered that the SAP yield can be improved by separating and collecting SAP from the air flowing in the intake duct and supplying it again to the spray duct.
- the life of the intake duct is shortened due to the collision of the SAP. Recovering SAP from the stream improves.
- SAP fine powder fine powder finer than the above numerical range
- liquid should enter the gaps between the fibers in the absorbent body in order and smooth liquid absorption should be performed, but such gaps are filled with SAP fine powder. If it is, it will not be able to absorb liquid without entering. And in consideration of this point, when all the SAP flowing through the intake duct as described above is collected and returned to the spraying duct, the embedding action between the fiber gaps by the SAP fine powder is promoted, and as a result, There is a risk of producing an absorber that is liable to cause liquid absorption inhibition.
- the present invention has been made in view of the conventional problems as described above, and its object is to suppress the liquid absorption inhibition at the initial stage of liquid absorption while improving the yield of SAP and extending the life of the intake duct.
- the object is to produce an absorber that can be used.
- the main invention for achieving the above object is: An absorbent body manufacturing apparatus for depositing liquid absorbent fibers and a superabsorbent polymer in a deposition section to form an absorbent body, A plurality of air intake holes provided in the accumulation part, the air intake holes for depositing the liquid absorbent fibers and the superabsorbent polymer flowing in the distribution duct into the accumulation part by intake air; and An intake duct that is provided in communication with the intake hole and sucks air so that the intake hole performs intake; An apparatus for manufacturing an absorbent body, comprising: a separation device that separates a superabsorbent polymer having a predetermined size or more from an air flow through the intake duct and returns the polymer to the spray duct.
- a method for producing an absorbent body in which a liquid absorbent fiber and a superabsorbent polymer are deposited on a deposition portion to form an absorbent body Depositing the liquid absorbent fibers and the superabsorbent polymer flowing in the spray duct by depositing air from a plurality of air intake holes provided in the depositing section; A superabsorbent polymer having a predetermined size or more is selected from the flow of air flowing through the intake duct when the intake hole sucks air by suction of air from the intake duct provided in communication with the intake hole. Separating and returning to the spraying duct.
- an absorbent body capable of suppressing liquid absorption inhibition at the initial stage of liquid absorption while improving the yield of SAP and extending the life of the intake duct.
- FIG. 1A and FIG. 1B are overall layout views of a manufacturing apparatus 10 for an absorbent body 1 according to this embodiment, FIG. 1A shows a plan view, and FIG. 1B shows a side view taken along the line BB in FIG.
- the figure is shown.
- 3 is an enlarged center longitudinal sectional view of a rotary drum 20.
- FIG. 3A is a side view of the centrifugal separator 63
- FIG. 3B is a view taken along arrow BB in FIG. 3A.
- 4 is an enlarged cross-sectional view of a branch pipe 65 according to a centrifugal separator 63.
- FIG. It is a perspective view of the modification of a separation device.
- An absorbent body manufacturing apparatus for depositing liquid absorbent fibers and a superabsorbent polymer in a deposition section to form an absorbent body, A plurality of air intake holes provided in the accumulation part, the air intake holes for depositing the liquid absorbent fibers and the superabsorbent polymer flowing in the distribution duct into the accumulation part by intake air; and An intake duct that is provided in communication with the intake hole and sucks air so that the intake hole performs intake;
- An apparatus for manufacturing an absorbent body comprising: a separation device that separates a superabsorbent polymer having a predetermined size or more from the flow of air flowing through the intake duct and returns the polymer to the spray duct.
- the separation device is preferably a centrifuge device. According to such an apparatus for manufacturing an absorbent body, since the separation device is a centrifugal separation device, clogging is unlikely to occur, and maintenance work for clogging factors can be reduced.
- the centrifugal separator has a spirally swirled flow path provided as a part of the intake duct, A branch path branched from the flow path is provided in an outer portion of the flow path in the turning radius direction, Due to the centrifugal force acting when flowing along the flow path, the superabsorbent polymer of the predetermined size or more moves to the outer part of the flow path and is guided to the branch path, It is desirable that the superabsorbent polymer having a predetermined size or more is sent to the spray duct through the branch path.
- SAP having a predetermined size or more can be captured with a simple configuration of a spiral channel and a branch channel. Therefore, a manufacturing apparatus can be made cheap and the cost reduction of the absorbent article using the said absorber can be aimed at.
- a method for producing an absorbent body in which a liquid absorbent fiber and a superabsorbent polymer are deposited on a deposition portion to form an absorbent body Depositing the liquid absorbent fibers and the superabsorbent polymer flowing in the spray duct by depositing air from a plurality of air intake holes provided in the depositing section; When the air intake hole sucks air by suction of air in the air intake duct provided in communication with the air intake hole, a superabsorbent polymer having a predetermined size or more is selected from the flow of air flowing through the air intake duct. Separating and returning to the spray duct, a method of manufacturing an absorbent body.
- the amount of SAP passing through the intake duct located downstream from the position where the superabsorbent polymer is separated is reduced. Therefore, the life of the intake duct can be extended. Furthermore, since the SAP of a predetermined size or larger is separated from the SAP flowing through the intake duct and returned to the spray duct, it is effectively prevented that the SAP fine powder is resupplied into the spray duct. It becomes possible to manufacture an absorbent body in which inhibition of liquid absorption at the initial stage of the liquid is suppressed.
- FIG. 1A shows a plan view
- FIG. 1B shows a side view taken along arrow BB in FIG. 1A.
- the manufacturing apparatus 10 is a so-called fiber stacking apparatus 10. That is, the manufacturing apparatus 10 is provided with a concave forming die 21 (corresponding to a depositing portion) on the outer peripheral surface 20a, and the pulp fiber 2 toward the outer peripheral surface 20a of the rotating drum 20 rotating in the circumferential direction Dc.
- the circumferential direction Dc of the rotating drum 20 is also simply referred to as “circumferential direction Dc”
- the width direction of the rotating drum 20 is also referred to as “CD direction”.
- FIG. 2 is an enlarged side view of the rotary drum 20.
- the rotating drum 20 has, for example, a cylindrical body that is driven and rotated around a horizontal rotation axis C20 along the CD direction as a main body. Then, both end openings in the width direction of the rotating drum 20 are covered and closed by a pair of circular wall portions 20b and 20b (FIGS. 1A and 1B), whereby a donut shape is formed on the inner peripheral side of the rotating drum 20.
- a substantially closed space S is defined.
- the molds 21, 21,... Are provided on the outer circumferential surface 20a of the rotary drum 20 at a predetermined pitch in the circumferential direction Dc.
- the bottom surface of each mold 21 has a large number of intake holes 22, 22... Can pass through the mold 21 and the substantially closed space S through the intake holes 22, 22. Communicating with
- the substantially closed space S is divided into zones in the circumferential direction Dc by the partition walls 27, 27 as shown in FIG. 2, and an intake duct 41 is connected to the first zone Z1 shown in FIG.
- the air in the first zone Z1 is sucked out from the suction opening 41a of the intake duct 41, and the first zone Z1 is maintained in a negative pressure state lower than the outside air. Therefore, when the molding die 21 moves on the position of the outer peripheral surface 20a corresponding to the first zone Z1, the intake hole 22 of the molding die 21 sucks air. Thereby, the pulp fiber 2 and SAP in the distribution duct 31 accumulate in the shaping
- the intake duct 41 is not connected to the second zone Z2, so that when the molding die 21 enters the position of the outer peripheral surface 20a corresponding to the second zone Z2, the intake of the molding die 21 is almost stopped.
- the absorbent body 1 in the mold 21 is delivered to the belt conveyor 101 by the intake air from the belt conveyor 101 arranged corresponding to the second zone Z2, and the belt conveyor 101 thereafter performs the next process. It is conveyed to.
- a sheet-like member 9 such as a nonwoven fabric or tissue paper may be supplied onto the belt conveyor 101, and the absorbent body 1 may be delivered onto the sheet-like member 9.
- the said sheet-like member 9 becomes a surface sheet (sheet which contacts a wearer's skin) etc. which concern on a disposable diaper and a sanitary napkin.
- the spray duct 31 is a tubular member having a substantially rectangular cross section disposed, for example, above the rotary drum 20.
- the spray port 31 a at the lower end of the spray duct 31 is oriented in a substantially vertical direction.
- the upper part of the outer peripheral surface 20a of the rotating drum 20 is covered over a predetermined range in the circumferential direction Dc.
- pulp fiber 2 obtained by pulverizing a pulp sheet by a pulverizer (not shown) is supplied from an opening 31b at the upper end opposite to the spray port 31a, and intake air from the intake hole 22 is supplied to the pulp fiber 2.
- an air flow 3 containing pulp fibers 2 is formed in the spray duct 31 from the upper side to the lower side.
- the SAP supply device 50 is relatively composed of a regular supply system 51 that supplies new SAP to the spray duct 31 and an air flow 4 (corresponding to an air flow) flowing through the intake duct 41.
- a recovery supply system 61 for recovering large SAPs and re-supplying them to the spray duct 31.
- the regular supply system 51 is provided in communication with a hopper 53 serving as a storage unit for storing new SAP, a screw feeder 54 for quantitatively feeding the SAP in the hopper 53, and a screw feeder.
- a chute 55 that receives and slides down the SAP that is supplied and dropped from 54, and an SAP supply path 56 that is formed of appropriate piping for pressure-feeding the SAP that slides down from the chute 55 to the spray duct 31.
- a nozzle 57 as an SAP discharge port is provided at one pipe end 56 a of the SAP supply path 56, and the nozzle 57 is disposed in the spray duct 31.
- a blower 58 is connected to the other pipe end 56 b of the SAP supply path 56, and an air flow 5 from the other pipe end 56 b to the nozzle 57 flows into the SAP supply path 56 by blowing air from the blower 58.
- the above-described chute 55 is provided at a position in the middle of the SAP supply path 56. Therefore, the SAP that is slid down and supplied from the chute 55 is pumped into the spray duct 31 through the SAP supply path 56 and the nozzle 57.
- the recovery supply system 61 includes a centrifugal separator 63 as an example of a separator that recovers SAP from the air flow 4 in the intake duct 41, and a resupply for resupplying the SAP recovered by the centrifugal separator 63 to the spray duct 31. And a channel 66.
- the resupply path 66 is formed by appropriate piping, and a nozzle 67 is provided at one pipe end 66 a, and the nozzle 67 is disposed in the spray duct 31.
- the other pipe end 66b of the supply path 66 is connected to a part P66 upstream of the chute 55 in the SAP supply path 56, and re-supply is performed by blowing air from the blower 58 described above.
- An air flow 6 toward the nozzle 67 is generated in the path 66. Therefore, the SAP recovered by the centrifugal separator 63 is pumped by the air flow 6 into the spray duct 31 through the resupply path 66 and the nozzle 67.
- FIG. 3A shows a side view of the centrifugal separator 63.
- FIG. 3B shows a BB arrow view in FIG. 3A.
- the centrifugal separator 63 collects SAP having a particle size of, for example, 100 microns (corresponding to “predetermined size”) or more from the air flow 4 in the intake duct 41. That is, the air flow 4 in the intake duct 41 contains SAP and pulp fibers, and a relatively large SAP having a particle size of 100 microns or more is separated and collected from the SAP. As a result, SAP having a relatively large size that does not contain the SAP fine powder is supplied again to the spray duct 31.
- the reason why the air flow 4 of the intake duct 41 includes SAP and pulp fibers is as follows. Basically, most of the SAP and pulp fibers are deposited on the mold 21 of the rotary drum 20 and remain there, but some of them pass through the intake holes 22 of the mold 21.
- the hole diameter of the intake hole 22 (for example, the hole diameter of a round hole by etching or a rectangular hole such as a mesh) is set to, for example, 0.15 to 0.6 mm, and more preferably 0.17 to 0.37 mm.
- the SAP passes through the air intake hole 22 until the pulp fiber is accumulated to some extent in the mold 21 and the pulp fiber comes to retain the SAP.
- a SAP having a relatively large size such as 100 to 600 microns can be included in addition to the SAP fine powder.
- the lower limit value of the SAP size to be separated and recovered from the SAP fine powder is defined by the particle size. However, depending on the case, it may be defined by another index such as a long diameter. Further, when the particle size is defined, the lower limit value is not limited to the above-mentioned 100 microns, and the lower limit value may be selected from a range of 10 to 500 microns, for example. Hereinafter, a relatively large size SAP to be collected is also referred to as a “large SAP”.
- the centrifugal separator 63 has a spiral tube 64 having a spiral flow path spirally (spiral) as a main body. Then, after the pipe at the predetermined position P41 of the intake duct 41 is removed, the spiral pipe 64 is interposed at the predetermined position P41 instead of the pipe, whereby the spiral pipe 64 is inserted into the intake duct 41. Part of the flow path. That is, one end opening 64 a of the spiral pipe 64 is connected to the pipe end 41 c on the upstream side of the intake duct 41, and the other end opening 64 b is connected to the pipe end 41 d on the downstream side of the intake duct 41.
- a branch pipe 65 (corresponding to a branch path) is provided along the direction in which the air flow 4 flows, that is, along the substantially tangential direction of the outer peripheral part, in the outer peripheral part that is the outer part in the turning radius direction of the spiral pipe 64. Is provided.
- the branch pipe 65 is connected to the above-described resupply path 66, whereby the centrifuged large SAP is sent to the resupply path 66 through the branch pipe 65. Details are as follows.
- the air flow 4 in the intake duct 41 contains SAP and pulp fibers. Therefore, these SAPs and pulp fibers also flow through the spiral flow path of the spiral tube 64. And while flowing through this spiral flow path, centrifugal force according to the turning radius of the spiral flow path acts on these SAPs and pulp fibers, and each of them is moved outward in the turning radius direction.
- the degree of this movement differs depending on the magnitude of the acting centrifugal force, a large SAP having a large mass moves further outward, and a SAP fine powder or pulp fiber having a small mass is not so outward. Do not move.
- the large SAP is guided to the branch pipe 65 provided in the outer peripheral portion of the spiral pipe 64 and sent to the resupply path 66, but on the other hand, the SAP fine powder and the pulp fiber have a small centrifugal force. Then, the air flows through the intake duct 41 as it is, and is collected and discarded by a dust collector (not shown) attached to an exhaust blower (not shown) provided at the end of the intake duct 41. As a result, the large SAP is collected approximately selectively by centrifugation and re-supplied to the spray duct 31.
- the specifications such as the turning radius of the spiral channel (the turning radius at the center of the cross section), the number of turns of the spiral channel (about 1 turn in the illustrated example), the total length of the spiral channel, etc. ,
- the branch pipe 65 may be connected to the latter half of the spiral flow path, more preferably to the rear end.
- the large SAP to be taken out is surely moved to the outer position in the turning radial direction where the branch pipe 65 is located before reaching the branch pipe 65 while shortening the overall length of the spiral flow path. And can be induced.
- the connecting angle ⁇ between the branch pipe 65 and the resupply path 66 may be an acute angle, and is preferably selected from a range greater than 0 ° and not greater than 80 °, and more preferably selected from a range greater than 0 ° and not greater than 60 °.
- the ejector based on the dynamic pressure of the air flow 6 which flows through the resupply path 66, the dynamic pressure of the air flow 7 in the branch pipe 65, and also the viscosity of these air flows 6 and 4 Due to the effect or the like, the large SAP flowing through the branch pipe 65 can be quickly and smoothly drawn into the resupply path 66. Incidentally, this pulling effect becomes higher when the flow velocity V6 of the air flow 6 in the resupply path 66 at the connection position Pj is faster. Therefore, in the example of FIG.
- a throttle portion 68 for reducing the flow path cross-sectional area is provided at a position immediately upstream of the connection position Pj in the resupply path 66, and the flow velocity V6 of the air flow 6 at the connection position Pj. Has been increased.
- the centrifugal separator 63 collects SAP having a particle size of, for example, 100 microns or more from the air flow 4 in the intake duct 41.
- SAP of comparatively large size other than SAP fine powder can be resupplied to the distribution duct 31. Therefore, in comparison with the configuration in which all the SAPs flowing in the intake duct 41 are collected and re-supplied to the spray duct 31, the present embodiment can significantly suppress the liquid absorption inhibition of the absorber 1.
- the separation device 63 re-supplies SAP of 100 microns or more to the spray duct 31. Therefore, the large SAP, that is, the SAP having a relatively large size is re-supplied to the forming die 21 through the spray duct 31, and thereby the large SAP for the SAP deposited in the absorber 1.
- the ratio of can be increased.
- the total liquid absorption capacity of SAP that is, the total amount of SAP in the absorber 1 can be maintained at a predetermined value, while the amount of SAP fine powder mixed into the absorber 1 can be reduced by an increase in the proportion of large SAP.
- the absorber 1 in which the liquid absorption inhibition at the initial stage of liquid absorption is suppressed can be manufactured.
- FIG. 5 is a perspective view of a modified example of the separation device, partially broken away.
- the separation device 70 of this modification is also a centrifuge, it is different from the separation device 63 of the above-described embodiment in that it is a cyclone system. Since the configuration other than this is substantially the same, only the cyclone type separation device 70 will be described below.
- This separation device 70 has a cylindrical body 71 having a cylinder axis direction along the vertical direction as a main body. And the lower part of this cylindrical body 71 becomes funnel-shaped, and has the 1st opening part 71a in the lowest end.
- the upper end portion of the cylindrical body 71 is closed by a lid portion 71f, but a second opening 71b is provided at the center of the plane of the lid portion 71f.
- a third opening 71 c is also provided on the upper portion of the cylindrical body 71.
- this separation apparatus 70 is also interposed in the flow path of the intake duct 41 similarly to the spiral pipe 64 according to the above-described embodiment. That is, the third opening 71c is connected to the upstream pipe end 41c (FIG. 3A) of the intake duct 41, and the second opening 71b is connected to the downstream pipe end 41d (FIG. 3A) of the intake duct 41. Yes.
- the first opening 71a is connected to the resupply path 66 described above via an appropriate pipe 72.
- the large SAP is separated and collected as follows. First, the air flow 4 of the intake duct 41 flows from the third opening 71c toward the inner peripheral surface of the cylindrical body 71 so as to draw a spiral along the circumferential direction. Then, the large SAP in the air flow 4 turns along the inner wall surface 71w of the cylindrical body 71 and falls due to its own weight, reaches the first opening 71a below, and passes through the first opening 71a again. It is sent to the supply path 66. On the other hand, as shown in FIG.
- the lightweight SAP fine powder and pulp fiber ride on the rising airflow generated at the center of the plane of the cylindrical body 71 and are discharged from the second opening 71 b of the lid portion 71 f to the intake duct 41. .
- the large SAP is separated from the SAP fine powder, and is introduced into the spray duct 31 through the resupply path 66.
- the branch pipe 65 related to the centrifugal separator 63 is connected to the resupply path 66, but the present invention is not limited to this.
- the recovered large SAP may be returned to the SAP that is connected to the SAP supply path 56 and flows in the SAP supply path 56.
- the recovered large SAP is mixed, it becomes difficult to manage the amount of SAP supplied into the spray duct 31, so it is preferable to use a separate system as in the above-described embodiment.
- the molding die 21 formed in a concave shape on the outer peripheral surface 20a of the rotary drum 20 is shown as an example of the accumulation portion, but the present invention is not limited to this.
- the outer peripheral surface 20a is formed of a substantially smooth surface, and suction holes 22 are formed only in a predetermined region on the outer peripheral surface 20a to apply a suction force, whereby the predetermined region is used as the accumulation portion for the pulp fiber 2 or SAP.
- the absorbent body 1 may be formed by depositing.
- a chain conveyor, a belt conveyor, or the like may be used. That is, while the predetermined circulation track is moved to the mold 21 by the conveyor, the spray duct 31 may be arranged at a predetermined position on the rotation track.
- the pulp fiber 2 (pulverized pulp) is exemplified as the liquid absorbent fiber.
- this liquid absorbent fiber absorption of absorbent articles such as conventional sanitary napkins and disposable diapers is possible.
- Various things used for the body 1 can be used without a restriction
- short fibers of cellulosic fibers such as rayon fibers and cotton fibers, short fibers of synthetic fibers such as polyethylene, and the like can be used. These fibers may be used alone or in combination of two or more.
- SAP SAP-based, cellulose-based or synthetic polymer-based materials
- SAP is usually in the form of particles.
- those having a liquid-absorbing holding power of 20 times or more of their own weight and a property of gelling are preferable.
- starch-acrylic acid (salt) graft copolymer starch-acrylonitrile copolymer Preferred are a saponified coal, a crosslinked product of sodium carboxymethyl cellulose, an acrylic acid (salt) polymer, and the like. These SAPs may be used alone or in combination of two or more.
Abstract
Description
吸収体は、パルプ繊維等の液体吸収性繊維を所定形状に成形したものを基材とし、その中には、粒状の高吸収性ポリマーも混入されている。なお、高吸収性ポリマーとは、吸液により膨潤等して高い液体の保持性能を有した高分子重合体等のことであり、以下では、これを「SAP」とも言う。
このような吸収体は、例えば、適宜な散布ダクト内を流れる空気流中のパルプ繊維を、回転ドラムの外周面の堆積部に堆積して形成される。詳しくは、堆積部は、所定の配置パターンで配された多数の吸気孔を有し、それらの吸気によってパルプ繊維が堆積部の略外形形状で堆積して吸収体が生成される。
また、散布ダクト内には、SAPの供給用にノズルも配置されており、そのノズルから散布ダクト内にSAPが吐出される。これにより、SAPも、散布ダクト内の空気流に乗ってパルプ繊維と共に堆積部に堆積する。
一方、上述の吸気孔の吸気は、吸気孔に連通する吸気ダクトによる空気の吸引によって行われる。よって、吸気孔を通ったSAPは、吸気ダクトを通過する。そこで、吸気ダクト内を流れる空気からSAPを分離して回収し、散布ダクトに再供給すれば、SAP歩留まりの向上を図れると考えられる。
また、この吸気ダクトを通過する空気の流れにSAPが混入していると、SAPの衝突により吸気ダクトの寿命が短くなってしまうが、この点についても、上述のように吸気ダクト内の空気の流れからSAPを回収すれば、改善される。
詳しく説明すると、一般に、SAPの粒径は、その中央値で300~500ミクロンであるとされている。しかし、実際には、散布ダクトへの供給過程等においてSAP同士が擦れ合う等して、上記の数値範囲よりも格段に細かいサイズ(例えば、粒径が10ミクロン以下)の微粉(以下、SAP微粉とも言う)も生じてしまう。そして、かかるSAP微粉は、吸収体のパルプ繊維の繊維間隙間に入り込んで、当該隙間を埋めてしまう。
そして、この点を考慮すると、上述のように吸気ダクトを流れる全てのSAPを回収して散布ダクトへ戻した場合には、SAP微粉による繊維間隙間の埋設作用を促進してしまい、その結果、吸液阻害を起こし易い吸収体を製造してしまう虞がある。
液体吸収性繊維及び高吸収性ポリマーを堆積部に堆積して吸収体を成形する吸収体の製造装置であって、
前記堆積部に設けられた複数の吸気孔であって、散布ダクト内を流れる前記液体吸収性繊維及び前記高吸収性ポリマーを吸気によって前記堆積部に堆積する前記吸気孔と、
前記吸気孔に連通して設けられ、前記吸気孔が吸気を行うように空気を吸引する吸気ダクトと、
前記吸気ダクトを流れる空気の流れの中から、所定の大きさ以上の高吸収性ポリマーを分離して前記散布ダクトへ戻す分離装置と、を有することを特徴とする吸収体の製造装置である。
液体吸収性繊維及び高吸収性ポリマーを堆積部に堆積して吸収体を成形する吸収体の製造方法であって、
前記堆積部に設けられた複数の吸気孔から吸気をすることにより、散布ダクト内を流れる前記液体吸収性繊維及び前記高吸収性ポリマーを前記堆積部に堆積することと、
前記吸気孔に連通して設けられた吸気ダクトの空気の吸引によって前記吸気孔が吸気をする際に、前記吸気ダクトを流れる空気の流れの中から、所定の大きさ以上の高吸収性ポリマーを分離して前記散布ダクトへ戻すことと、を有することを特徴とする吸収体の製造方法である。
液体吸収性繊維及び高吸収性ポリマーを堆積部に堆積して吸収体を成形する吸収体の製造装置であって、
前記堆積部に設けられた複数の吸気孔であって、散布ダクト内を流れる前記液体吸収性繊維及び前記高吸収性ポリマーを吸気によって前記堆積部に堆積する前記吸気孔と、
前記吸気孔に連通して設けられ、前記吸気孔が吸気を行うように空気を吸引する吸気ダクトと、
前記吸気ダクトを流れる空気の流れの中から、所定の大きさ以上の高吸収性ポリマーを分離して前記散布ダクトへ戻す分離装置と、を有することを特徴とする吸収体の製造装置。
また、分離装置よりも下流に位置する吸気ダクトについては、通過するSAPの量が減る。よって、当該吸気ダクトの寿命延長を図れる。
更には、吸気ダクトを流れるSAPの中から、所定の大きさ以上のSAPを分離して散布ダクトへ戻すので、散布ダクト内にSAP微粉を再供給することは有効に防止され、その結果、吸液初期の吸液阻害が抑制された吸収体を製造可能となる。
前記分離装置は、遠心分離装置であるのが望ましい。
このような吸収体の製造装置によれば、分離装置は遠心分離装置なので、目詰まりを起し難く、もって、目詰まり要因の保守点検作業の軽減化を図れる。
前記遠心分離装置は、前記吸気ダクトの一部として設けられた螺旋状に旋回した流路を有し、
前記流路における旋回半径方向の外方部分には、前記流路から分岐した分岐路が設けられており、
前記流路に沿って流れる際に作用する遠心力によって、前記所定の大きさ以上の高吸収性ポリマーが、前記流路の前記外方部分へと移動して前記分岐路に誘導され、
前記所定の大きさ以上の高吸収性ポリマーが、前記分岐路を介して前記散布ダクトへと送られるのが望ましい。
このような吸収体の製造装置によれば、螺旋状の流路と、分岐路という簡易な構成で、所定の大きさ以上のSAPを捕捉することができる。よって、製造装置を安価にできて、当該吸収体を用いた吸収性物品のコスト削減を図れる。
液体吸収性繊維及び高吸収性ポリマーを堆積部に堆積して吸収体を成形する吸収体の製造方法であって、
前記堆積部に設けられた複数の吸気孔から吸気をすることにより、散布ダクト内を流れる前記液体吸収性繊維及び前記高吸収性ポリマーを前記堆積部に堆積することと、
前記吸気孔に連通して設けられた吸気ダクトの空気の吸引によって前記吸気孔が吸気をする際に、前記吸気ダクトを流れる空気の流れの中から、所定の大きさ以上の高吸収性ポリマーを分離して前記散布ダクトへ戻すことと、を有することを特徴とする吸収体の製造方法。
このような吸収体の製造方法によれば、堆積部に堆積せずに吸気孔を通過して吸気ダクトを流れるSAPを捕捉して、堆積部へと再供給することができる。よって、液体吸収性繊維と比較して高価なSAPの歩留まり向上を図れる。
更には、吸気ダクトを流れるSAPの中から、所定の大きさ以上のSAPを分離して散布ダクトへ戻すので、散布ダクト内にSAP微粉を再供給することは有効に防止され、その結果、吸液初期の吸液阻害が抑制された吸収体を製造可能となる。
図1A及び図1Bは、本実施形態に係る吸収体1の製造装置10の全体配置図である。図1Aには平面図を示し、図1Bには図1A中のB-B矢視の側面図を示している。なお、これらの図中には、説明の関係上、透視して示している部位や断面視で示している部位もある。
図1Bに示すように、この製造装置10は、いわゆる積繊装置10である。すなわち、製造装置10は、外周面20aに凹状の成形型21(堆積部に相当)が設けられ、周方向Dcに回転する回転ドラム20と、回転ドラム20の外周面20aに向けてパルプ繊維2を散布することにより、成形型21内にパルプ繊維2を堆積させて吸収体1を成形する散布ダクト31と、散布ダクト31を介して成形型21にSAPを供給するSAP供給装置50と、散布ダクト31の設置位置よりも周方向Dcの下流側に配置され、成形型21から吸収体1を離型して搬送するベルトコンベア101と、を備えている。
なお、以下では、回転ドラム20の周方向Dcのことを単に「周方向Dc」とも言い、回転ドラム20の幅方向のことを「CD方向」とも言う。
回転ドラム20は、例えばCD方向に沿った水平な回転軸C20周りに駆動回転する円筒体を本体とする。そして、この回転ドラム20の幅方向の両端開口は一対の円形壁部20b,20b(図1A、図1B)で覆われて塞がれ、これにより回転ドラム20の内周側にはドーナツ型の略閉空間Sが区画されている。
回転ドラム20の外周面20aには、上述のように成形型21,21…が周方向Dcに所定ピッチで設けられている。そして、各成形型21の底面は、多数の吸気孔22,22…を有しており、これら吸気孔22,22…を介して、各成形型21内と前記略閉空間Sとは通気可能に連通している。
よって、第1ゾーンZ1に対応する外周面20aの位置を成形型21が移動する際には、成形型21の吸気孔22は吸気する。これにより、散布ダクト31内のパルプ繊維2やSAPは、成形型21内に堆積し、吸収体1が成形される。
先ず、前述したように、遠心分離装置63は、吸気ダクト41内の空気流4から、例えば粒径が100ミクロン以上のSAPを回収する。これにより、SAP微粉以外の比較的大きいサイズのSAPを散布ダクト31へ再供給することができる。
よって、吸気ダクト41内を流れる全てのSAPを回収して散布ダクト31へ再供給する構成との比較においては、本実施形態の方が、格段に吸収体1の吸液阻害を抑制できる。
先ず、第3開口部71cから、吸気ダクト41の空気流4が、円筒体71の内周面に向けて、その周方向に沿って螺旋を描くように流入する。すると、空気流4中の大SAPは、円筒体71の内壁面71wを伝って旋回するとともに自重により落下して、下方の第1開口部71aへ至り、当該第1開口部71aを通って再供給路66へ送出される。一方、軽量のSAP微粉やパルプ繊維は、図5に示すように、円筒体71の平面中心に生じる上昇気流に乗って、蓋部71fの第2開口部71bから吸気ダクト41へと排出される。以上により、SAP微粉から大SAPは分離され、再供給路66を経て散布ダクト31内に投入される。
以上、本発明の実施形態について説明したが、本発明は、かかる実施形態に限定されるものではなく、以下に示すような変形が可能である。
Claims (4)
- 液体吸収性繊維及び高吸収性ポリマーを堆積部に堆積して吸収体を成形する吸収体の製造装置であって、
前記堆積部に設けられた複数の吸気孔であって、散布ダクト内を流れる前記液体吸収性繊維及び前記高吸収性ポリマーを吸気によって前記堆積部に堆積する前記吸気孔と、
前記吸気孔に連通して設けられ、前記吸気孔が吸気を行うように空気を吸引する吸気ダクトと、
前記吸気ダクトを流れる空気の流れの中から、所定の大きさ以上の高吸収性ポリマーを分離して前記散布ダクトへ戻す分離装置と、を有することを特徴とする吸収体の製造装置。 - 請求項1に記載の吸収体の製造装置であって、
前記分離装置は、遠心分離装置であることを特徴とする吸収体の製造装置。 - 請求項2に記載の吸収体の製造装置であって、
前記遠心分離装置は、前記吸気ダクトの一部として設けられた螺旋状に旋回した流路を有し、
前記流路における旋回半径方向の外方部分には、前記流路から分岐した分岐路が設けられており、
前記流路に沿って流れる際に作用する遠心力によって、前記所定の大きさ以上の高吸収性ポリマーが、前記流路の前記外方部分へと移動して前記分岐路に誘導され、
前記所定の大きさ以上の高吸収性ポリマーが、前記分岐路を介して前記散布ダクトへと送られることを特徴とする吸収体の製造装置。 - 液体吸収性繊維及び高吸収性ポリマーを堆積部に堆積して吸収体を成形する吸収体の製造方法であって、
前記堆積部に設けられた複数の吸気孔から吸気をすることにより、散布ダクト内を流れる前記液体吸収性繊維及び前記高吸収性ポリマーを前記堆積部に堆積することと、
前記吸気孔に連通して設けられた吸気ダクトの空気の吸引によって前記吸気孔が吸気をする際に、前記吸気ダクトを流れる空気の流れの中から、所定の大きさ以上の高吸収性ポリマーを分離して前記散布ダクトへ戻すことと、を有することを特徴とする吸収体の製造方法。
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