WO2017026529A1 - 吸収体の製造装置 - Google Patents
吸収体の製造装置 Download PDFInfo
- Publication number
- WO2017026529A1 WO2017026529A1 PCT/JP2016/073645 JP2016073645W WO2017026529A1 WO 2017026529 A1 WO2017026529 A1 WO 2017026529A1 JP 2016073645 W JP2016073645 W JP 2016073645W WO 2017026529 A1 WO2017026529 A1 WO 2017026529A1
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- WIPO (PCT)
- Prior art keywords
- absorbent
- water
- absorber
- aggregate
- resin
- Prior art date
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Classifications
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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
- A61F13/15764—Transferring, feeding or handling devices; Drives
-
- 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
-
- 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
- A61F13/15707—Mechanical treatment, e.g. notching, twisting, compressing, shaping
-
- 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
- A61F13/15707—Mechanical treatment, e.g. notching, twisting, compressing, shaping
- A61F13/15747—Folding; Pleating; Coiling; Stacking; Packaging
-
- 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
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
-
- 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
- A61F2013/15821—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing
-
- 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
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F2013/530131—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium being made in fibre but being not pulp
-
- 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
- A61F13/84—Accessories, not otherwise provided for, for absorbent pads
- A61F2013/8488—Accessories, not otherwise provided for, for absorbent pads including testing apparatus
Definitions
- the present invention relates to an absorber manufacturing apparatus.
- Sanitary materials such as disposable diapers and sanitary products have absorbent bodies in which absorbent fibers and water-absorbent resins are mixed.
- the water-absorbent resin used for this needs to be subjected to various evaluations depending on the application.
- the evaluation items include a wide variety of items such as absorption amount, absorption rate, absorption capacity under pressure, gel strength, and the like. Further, as one of the evaluations of the water absorbent resin, it is preferable to prepare an absorbent body equivalent to an actual product as a test body. And as a technique for manufacturing such an absorber, various things, such as patent documents 1, etc., are proposed, for example.
- Patent Document 1 since the apparatus disclosed in Patent Document 1 is for manufacturing a large amount of an absorber as an actual product, it is a large scale, and unless a large amount of absorbent fibers and water absorbent resin are used, the absorber Can not be manufactured. Therefore, this device is not suitable for producing a test absorber. In addition, as the test absorber, it is necessary to appropriately change the weight and blending ratio of the absorbent fibers and the water-absorbent resin according to the evaluation contents. The device of Patent Document 1 to be manufactured is not appropriate.
- the present invention has been made to solve this problem, and the absorbent fibers and the water-absorbent resin are mixed in the same manner as an actual product, and the composition such as the blending ratio is easily changed with a simple structure.
- An object of the present invention is to provide an absorbent body manufacturing apparatus capable of performing the above.
- An absorbent body manufacturing apparatus includes a transport unit that transports an aggregate of absorbent fibers and a water-absorbent resin, an aggregate of absorbent fibers and the water-absorbent resin transported by the transport unit, and receives the absorbent
- a mixing unit that mixes the absorbent fiber and the water absorbent resin, a chamber part having an internal space in which the absorbent fiber and the water absorbent resin mixed in the mixing unit fall, and a lower part of the chamber part, A laminate part having a recess in which the absorbent fibers and the water-absorbing resin that fall in the chamber part are laminated; and a suction unit that generates a negative pressure in the chamber part, the mixing unit being rotatable Between the cylindrical body that is supported and formed with irregularities on the outer peripheral surface, the drive unit that rotates the cylindrical body, and the outer peripheral surface of the cylindrical body, Forming a gap through which the aggregate of conveyed absorbent fibers and the water-absorbent resin pass, the gap being smaller than the thickness of the aggregate of absorbent
- the water-absorbent resin can be scattered in contact with the absorbent fiber aggregate. At this time, the water absorbent resin dispersed in contact with the absorbent fiber aggregate can be dispersed on the upper surface of the absorbent fiber.
- the water absorbent resin can be introduced into the gap at a timing different from that of the absorbent fiber aggregate.
- the gap forming portion includes a net-like thin plate material, and the thin plate material is disposed to face the outer peripheral surface of the cylindrical body in order to form the gap.
- the communication part and the mixing part can be configured.
- the chamber portion can be formed so as to increase in shape as it goes downward.
- a pressing member that presses the aggregate of absorbent fibers before entering the gap is provided between the transport unit and the mixing unit. It can comprise so that it may be urged
- the peripheral speed of the cylindrical body in the mixing unit can be made larger than the transport speed for transporting the material body to the mixing unit by the transport unit.
- the internal space of the chamber portion may include at least one guide member that guides the absorbent fiber aggregate and the water absorbent resin downward.
- the laminated portion includes a plate-like air circulation member in which a plurality of through holes are formed, and a frame member that is disposed on the air circulation portion and forms the recess.
- the suction unit may be configured to suck air from the internal space via the air circulation member.
- the stacked portion can be configured to be detachable from the wall that forms the side surface of the chamber portion.
- the chamber portion may have a vertical length of 10 to 100 cm and a maximum horizontal length of 10 to 100 cm.
- the absorbent fibers and the water-absorbent resin are mixed in the same manner as in the actual product, and the composition such as the blending ratio can be easily changed with a simple structure. .
- FIG. It is a front view which shows schematic structure of one Embodiment of the manufacturing apparatus which concerns on this invention. It is a top view of FIG. It is sectional drawing (a) and a top view (b) of a laminated part. It is the top view (a) and partial front view (b) of the absorber which were obtained with the manufacturing apparatus which concerns on an Example. It is a top view which shows the division
- This manufacturing apparatus mainly manufactures a test absorber.
- a material body in which a water-absorbing resin is dispersed in the vicinity of an aggregate of absorbent fibers is prepared, and from here, the absorbent body and the water-absorbent resin are uniformly mixed in this manufacturing apparatus. Manufacturing. Therefore, in this embodiment, before production, a material body in which a water-absorbing resin is simply scattered in an aggregate of absorbent fibers is referred to as a material body, and the absorbent fibers and the water-absorbing resin are mixed by a production apparatus. The result obtained will be referred to as an absorber.
- the phrase “mixed uniformly” is a word indicating a state in which the absorbent fibers and the water absorbent resin are sufficiently mixed, and the water absorbent resin is not necessarily present in all parts of the absorbent body. It is not necessary that the absorptive fiber content is constant.
- an absorbent body having different ratios of the water-absorbent resin and the absorbent fiber may be used below and above the absorbent body. Below, the material which comprises an absorber and a material body is demonstrated first, and the manufacturing apparatus of an absorber is demonstrated after that.
- the absorbent body and the material body according to the present embodiment include the absorbent fibers and the water absorbent resin. These will be described in detail below.
- Absorbent fiber for example, a finely cut and crushed hydrophilic fiber can be used.
- hydrophilic fibers include cellulose fibers such as cotton-like pulp, mechanical pulp, chemical pulp, and semi-chemical pulp obtained from wood; artificial cellulose fibers such as rayon and acetate; And fibers made of a synthetic resin.
- assembly of an absorptive fiber is made into the shape with thickness, for example, rectangular shape, circular shape, and polygonal shape, by laminating
- Water Absorbent Resin a known water absorbent resin can be used.
- the water-absorbing resin include a hydrolyzate of starch-acrylonitrile graft copolymer, a neutralized product of starch-acrylic acid graft polymer, a saponified product of vinyl acetate-acrylic acid ester copolymer, and an acrylic acid part.
- Water-absorbing resin such as a cross-linked product of a hydrate polymer is exemplified. Among these, a cross-linked product of a partially neutralized acrylic acid polymer is preferable from an industrial viewpoint such as supply capacity and cost.
- One type of water-absorbing resin may be used alone, or two or more types may be used in combination.
- Examples of the method for producing a crosslinked product of a partially neutralized acrylic acid polymer include a reverse phase suspension polymerization method and an aqueous solution polymerization method. Further, the degree of neutralization of the crosslinked product of the partially neutralized acrylic acid polymer is preferably 50 mol% or more, more preferably 70 to 90 mol% from the viewpoint of increasing the osmotic pressure of the water absorbent resin and enhancing the water absorption capacity. preferable.
- the water-absorbing resin used is preferably one in which the vicinity of the surface is cross-linked in order to enhance the absorption capacity under load.
- the water-absorbing resin is usually commercially available in powder form, and its shape is not particularly limited, and examples thereof include spherical, irregularly crushed, granular, scale-like, short rod-like, and aggregates thereof.
- the median particle diameter of the water-absorbent resin is preferably 200 to 600 ⁇ m, more preferably 250 to 500 ⁇ m, and further preferably 300 to 450 ⁇ m from the viewpoint of operability during production of the absorbent body.
- the median particle diameter of the water-absorbent resin is a value obtained by the following measurement method.
- amorphous silica (Degussa Japan Co., Ltd., Siperant 200) is mixed with 50 g of water absorbent resin powder.
- a JIS standard sieve is screened from above, a sieve having an opening of 850 ⁇ m, a sieve having an opening of 600 ⁇ m, a sieve having an opening of 500 ⁇ m, a sieve having an opening of 425 ⁇ m, a sieve having an opening of 300 ⁇ m, a sieve having an opening of 250 ⁇ m, and a sieve having an opening of 150 ⁇ m. Combine in the order of sieve and saucer.
- the mixture is put on the uppermost combined sieve and classified by shaking for 20 minutes using a low-tap shaker.
- the mass of the mixture remaining on each sieve is calculated as a mass percentage with respect to the total mass, and by integrating in order from the larger particle size, the integrated value of the mass percentage of the mixture remaining on the sieve opening and sieve Is plotted on a logarithmic probability paper.
- the particle diameter corresponding to an integrated mass percentage of 50 mass% is defined as the median particle diameter.
- the content of the water-absorbent resin in the absorbent body is not particularly limited, but from the viewpoint of obtaining sufficient liquid absorption performance even when the absorbent body according to the present invention is used in absorbent articles such as diapers. Is preferably 10 to 1000 g per square meter (that is, 10 to 1000 g / m 2 ), more preferably 20 to 900 g / m 2, and still more preferably 30 to 700 g / m 2 .
- the content is preferably 10 g / m 2 or more from the viewpoint of sufficiently exhibiting the liquid absorption performance as an absorber, and particularly suppressing the reversion of the liquid. From the viewpoint of improving the liquid permeability, the total content is 1000 g / m 2 or less is preferable.
- the blending ratio of the water-absorbing resin in the absorbent body that can be produced in the present invention is preferably 5 to 90% by mass, more preferably 10 to 80% by mass, and further preferably 15 to 70% by mass. If it is less than 5% by mass, the water-absorbing resin is too small and is not suitable as an evaluation method. On the other hand, when it exceeds 90 mass%, since there are too few absorptive fibers, the water-absorbent resin is easily detached from the absorber, which is not preferable.
- the material body can be in various forms.
- a water absorbent resin is scattered on the upper surface of the aggregate of absorbent fibers.
- a water-absorbing resin is scattered on the lower surface of the aggregate of absorbent fibers.
- a water-absorbing resin is scattered on the upper surface of the aggregate of absorbent fibers, and the aggregate of absorbent fibers is further disposed thereon.
- a plurality of (iii) are laminated. That is, an aggregate of absorbent fibers and a water absorbent resin are alternately laminated.
- a mixture of an absorbent fiber aggregate and a water absorbent resin is used.
- This mixture can be obtained by purchasing a commercially available absorber or by taking the absorber from a commercially available paper diaper. Or it can obtain by manufacturing an absorber with the manufacturing method of this invention.
- a water-absorbing resin is arranged on the upstream side (back side in the conveying direction) of the aggregate of absorbent fibers, Transport toward the gap.
- a water-absorbing resin is disposed on the downstream side (front side in the transport direction) of the aggregate of absorbent fibers and transported toward the gap by a transport means such as a belt conveyor.
- the absorbent fiber and the water absorbent resin are in contact with each other, and therefore the absorbent fiber and the water absorbent resin are simultaneously introduced into the gap described later.
- (vi) and (vii) can be repeated, or (i) to (vii) can be appropriately combined.
- FIG. 1 is a front view showing a schematic configuration of the manufacturing apparatus
- FIG. 2 is a plan view of FIG.
- the apparatus according to the present invention is not limited to this orientation.
- the manufacturing apparatus includes a housing 1 formed in a rectangular parallelepiped shape.
- the housing 1 includes a transport unit 2 that transports the material body 100, and a material body 100.
- a mixing unit 3 for mixing the absorbent fibers and the water absorbent resin, a chamber portion 4 having an internal space 40 where the mixed absorbent fibers and the water absorbent resin fall, and the dropped absorbent fibers and the water absorbent resin are laminated.
- the stacking unit 5 and a suction unit 6 that sucks air in the internal space 40 of the chamber unit 4 are provided.
- the conveyance unit 2 is provided on the upper surface of the housing 1 and is configured by a belt conveyor disposed on the right side of the upper surface of the housing 1. That is, the transport unit 2 is disposed on the right side of the upper surface of the housing, and is driven by the driven roller 21 extending in the front-rear direction, the driving roller 22 extending in the front-rear direction near the center of the upper surface of the housing, and the rollers 21 and 22. And a conveying belt 23 to be passed, and the driving roller is rotationally driven by a first motor (not shown). With this configuration, the material body 100 arranged on the conveyor belt 23 moves toward the left side (see arrow A in FIG. 1). Further, as will be described later, the transport unit 2 is provided with a guide unit 7 that guides the material body 100 transported by the transport belt 23 to the mixing unit 3.
- the speed of the conveyor belt 23 can be set to 0.1 to 20.0 mm / sec, for example.
- the mixing unit 3 is disposed on the left side of the upper end portion of the housing 1, and a cylindrical body 31 rotatably supported by the housing 1, and a second motor (driving unit) 32 that drives the cylindrical body 31. And a gap forming portion 33 for forming a gap through which the material body 100 passes between the outer peripheral surface of the cylindrical body 31.
- the cylindrical body 31 has irregularities formed on the surface thereof, and rotates around a rotation axis extending in the front-rear direction. And the outer peripheral surface of the cylindrical body 31 and the left end part of the conveyance unit 2 mentioned above are adjoining. Therefore, the material body 100 transported to the left side on the transport unit 2 is guided to the outer peripheral surface of the cylindrical body 31 by the guide portion 7 described below.
- the guide portion 7 includes a rod-shaped pressing member 71 having a circular cross section that presses the material body 100.
- the pressing member 71 is arranged to extend in the front-rear direction so as to pass above the left end of the transport unit 2.
- Bar-shaped support members 72 are attached to both ends of the rotatable pressing member 71, respectively.
- Each support member 72 extends so as to be perpendicular to the pressing member 71, and is disposed so as to sandwich the conveyance belt 23.
- tip part of each support member 72 is attached with respect to the upper surface of the housing
- a gap is formed between the pressing member 71 and the conveyor belt 23, and the material body 100 passes through this gap.
- This gap depends on the thickness of the material body 100, but is smaller than the thickness of the material body 100, and can be, for example, about 0 to 50 mm.
- Spring members 73 are respectively attached between both ends of the pressing member 71 and the upper surface of the housing 1, and the pressing member 71 is urged downward by the spring members 73. That is, when the material body 100 having a thickness larger than the gap between the pressing member 71 and the conveyor belt 23 passes, the pressing member 71 is pushed upward against the spring member 73, and the material body 100 is pass. However, the thickness of the material body 100 introduced into the mixing unit 3 is made as small as possible by preventing the pressing member 71 from being pushed up by the spring member 73 as much as possible.
- a support shaft 74 is inserted so as to penetrate the front end portion of the support member 72 disposed on the rear side in the front-rear direction, and a roller 75 rotated by the conveyor belt 23 is inserted into the front end portion of the support shaft 74. Installed. The roller 75 rotates together with the support shaft 74 as the transport belt 23 moves due to friction with the transport belt 23.
- a belt 76 is stretched between the rear end portion of the support shaft 74 and the rear end portion of the pressing member 71 in the axial direction.
- the pressing member 71 also rotates. It has become. Accordingly, the pressing member 71 rotates in synchronization with the movement of the transport belt 23, and thereby the material body 100 is pushed out to the mixing unit 3 side by the rotation of the pressing member 71.
- the second motor 32 described above is arranged on the left side of the cylindrical body 31, and a belt 35 is stretched between the rotation shaft of the second motor 32 and the rotation shaft of the cylindrical body 31, and the belt transmission.
- the rotational speed of the cylindrical body 31 can be set to, for example, 1000 to 5000 r / min.
- the gap forming portion 33 includes a pair of circular frames 331 that are disposed outside both sides of the cylindrical body 31 and have a slightly larger outer diameter than the cylindrical body 31.
- a cover member 332 having a circular arc cross section and a mesh member (plate member) 333 are detachably attached to the outer peripheral surfaces of the frames 331 so as to cover the cylindrical body 31.
- the cover member 332 is formed of a plate material on a cross-sectional arc that passes from the vicinity of the pressing member 71 over the cylindrical body 31 and extends to the vicinity of the left end portion of the cylindrical body 31.
- the mesh member 333 is a thin plate material in which a large number of small holes are formed in a mesh shape with metal or the like, and passes from the left end portion of the cover member 332 below the cylindrical body 31 and extends to the vicinity of the transport unit. Further, it is formed in an arc shape.
- the frame 331 is slightly larger than the outer diameter of the cylindrical body 31, a gap is formed between the cover member 332 and the mesh member 333 mounted on the frame 331 and the outer peripheral surface of the cylindrical body 31.
- the material body 100 passes through this gap.
- the gap between the mesh member 333 and the cylindrical body 31 can be 1 mm.
- the chamber portion 4 is composed of a front panel 41 and a rear panel (not shown) having a trapezoidal shape in front view, and a pair of side panels 43 that connect inclined sides on both sides of the front panel 41 and the rear panel.
- the internal space 40 is formed such that the upper end and the lower end are open and the internal width increases in the left-right direction as it goes downward.
- the upper end opening of the internal space 40 is disposed immediately below the cylindrical body 31, and the gap around the cylindrical body 31 and the internal space 40 communicate with each other through the mesh member 333.
- a plurality of guide members are arranged in the internal space 40.
- three guide members are provided. That is, a plate-shaped first guide member 44 disposed on the left side near the upper end of the internal space 40 and a plate-shaped first guide member disposed on the right side of the internal space 40 slightly below the first guide member 44.
- Two guide members 45 and a rod-like third guide member 46 extending in the front-rear direction near the center of the internal space 40 are provided. These three guide members 44 to 46 all extend in the front-rear direction so as to connect the front panel 41 and the rear panel (not shown).
- the first guide member 44 extends downward and guides the mixed absorbent fibers and the water absorbent resin to the right side so as not to be biased to the left side of the internal space 40.
- the second guide member 45 extends downward, and guides to the left side so that the absorbent fibers and the water absorbent resin guided to the right side by the first guide member 44 do not go too far to the right end of the internal space 40. It has become.
- the third guide member 46 guides the falling absorbent fibers and the water-absorbing resin, in particular, the water-absorbing resin so as to drop evenly to the left and right of the internal space 40.
- the chamber portion 4 preferably has a vertical length of 10 cm to 100 cm and a horizontal maximum length of 10 cm to 100 cm, a vertical length of 25 cm to 75 cm, and a horizontal maximum of 20 cm to More preferably, it is 80 cm.
- the maximum length in the horizontal direction is the length in the left-right direction of the lower end in the front view of FIG. Any range is acceptable.
- the laminated portion 5 is disposed below the chamber portion 4 so as to close the lower end opening thereof, and is a portion where the dropped absorbent fibers and the water absorbent resin are laminated.
- a rectangular support frame 51 formed in the same size as the lower end opening of the chamber portion 4, and a large number of mesh-like small frames fitted into the support frame 51.
- a plate-like air flow member 52 having holes formed therein and a frame member 53 that is detachably disposed on the air flow member 52 are provided.
- absorbent fibers and A water absorbent resin is laminated.
- a desired absorber is formed by the shape of the frame member 53. And this lamination
- stacking part 5 can be pulled out in the front under the chamber part 4.
- the handle 54 preferably has a detachable structure so that the back side and the near side in the insertion direction of the stacked portion 5 can be reversed.
- a suction unit 6 is disposed below the stacked portion 5.
- the suction unit 6 is composed of a suction port for sucking the laminated portion 5 from below and a suction device such as a known vacuum cleaner or decompression pump, and sucks the air in the internal space 40 of the chamber portion 4 downward. ing. That is, the air in the internal space 40 is sucked downward through the air circulation member 52 of the laminated portion 5.
- the negative pressure generated by the suction can be monitored by installing a differential pressure gauge in the chamber part 4 and can be absorbed under a certain negative pressure condition by installing a pressure adjusting valve in the suction unit 6. You will be able to create a body.
- the sizes of the transport unit 2, the mixing unit 3, the chamber unit 4, the laminated unit 5, and the suction unit 6 are adjusted according to the size of the absorber for evaluation to be prepared.
- an absorbent body having a uniform distribution of the water-absorbing resin can be produced.
- the size of the absorber that can be produced is determined by the size of the concave portion 531 of the laminated portion 5, and the size is preferably in the range of 15 cm ⁇ 10 cm to 80 cm ⁇ 30 cm, and 20 cm ⁇ 10 cm to 60 cm ⁇ More preferably within the range of 20 cm. In an absorber of 15 cm ⁇ 10 cm or less, it is too small as an absorber for evaluation, and the amount of leakage cannot be absorbed too much to make a difference in evaluation difficult.
- a breathable sheet member such as tissue paper
- an absorbent body thereon.
- a highly breathable sheet member for example, tissue or non-woven fabric (not shown) is disposed on the air flow member 52 of the laminated portion 5. This is to prevent the laminated absorbent fibers and water-absorbing resin from falling out of the pores of the air flow member 52. Note that it is confirmed that the sheet member does not shift when the suction device is turned on.
- the material body 100 is prepared. As described above, there are various modes of the material body 100.
- the absorbent fiber formed in a substantially rectangular shape on the transport belt 23 of the transport unit 2 is used.
- the aggregate 101 is disposed, and the water absorbent resin 102 is scattered on the left and right evenly with respect to the belt traveling direction.
- the absorbent fiber aggregate 101 can have various shapes other than the substantially rectangular shape as described above.
- the first motor is driven.
- the material body 100 on the transport belt 23 moves to the left side and is guided to the mixing unit 3 while being pressed by the pressing member 71.
- the cylindrical body 31 of the mixing unit 3 rotates at high speed, the material body 100 introduced into the mixing unit 3 enters the gap while being sequentially cut.
- the material body 100 moves counterclockwise in the gap by the rotation of the cylindrical body 31.
- corrugation is formed in the outer peripheral surface of the cylindrical body 31, the material body 100 is crushed and rubbed with the cover member 332, and an absorptive fiber and a water absorbing resin are mixed.
- the material body 100 is further rubbed between the mesh member 333 and the cylindrical body 31 after passing through the cover member 332. That is, since the material body 100 is sheared between the unevenness of the cylindrical body 31 and the unevenness of the mesh member 333, the material body 100 is crushed, and the absorbent fibers and the water absorbent resin are further mixed. Then, reaching below the cylindrical body 31, the mixed absorbent fibers and the water-absorbing resin fall downward from the pores of the mesh member 333 with the help of suction by the suction unit 6. The absorbent fibers and the water-absorbent resin that have not dropped here are mixed while being rubbed by the cylindrical body 31 while moving in the gap, and eventually fall from the mesh member 333.
- the absorbent fibers and the water-absorbing resin dropped from the mesh member 333 are stacked in the recess 531 formed by the frame member 53 of the stacked unit 5 while dropping the internal space 40 of the chamber unit 4.
- the three guide members 44 to 46 described above are uniformly laminated in the recess 531.
- the absorbent fiber and the water absorbent resin are mixed in the recess 531 to form an absorbent body that is laminated with a predetermined basis weight. Then, after turning off each motor and the suction device, the absorber can be taken out from the device by pulling the laminated portion 5 forward.
- the material body 100 is introduced little by little into the mixing unit having the cylindrical body 31 that rotates at high speed. Separated and introduced into the gap. The material body 100 introduced into the gap is rubbed between the uneven cylindrical body 31 and the cover member 332 and between the cylindrical body 31 and the mesh member 333 and mixed while receiving a shearing force. Thereafter, the mixed absorbent fibers and the water-absorbent resin fall and are evenly stacked in the recess 531. As a result, an absorbent body in which the absorbent fibers and the water-absorbent resin are uniformly mixed and the thickness is uniform can be obtained.
- the absorbent body manufacturing apparatus can manufacture an absorbent body in which absorbent fibers and a water absorbent resin are uniformly mixed, as in a commercial manufacturing line, although it is a small apparatus. it can. That is, since it is possible to easily manufacture an absorbent body similar to this without using a commercial production line, various tests such as water absorption performance can be performed using the absorbent body according to the present embodiment.
- the material body 100 is mainly manufactured manually. At that time, the blending amounts of the absorbent fiber and the water absorbent resin can be appropriately changed. Even if such a change is made, the above apparatus is uniform. Can be produced. Therefore, since the compounding quantity of an absorptive fiber and a water absorbing resin can be changed easily according to evaluation content, the absorber for a test of a desired mixing
- the length of the mesh member 333 in the circumferential direction of the cylindrical body 31 is not particularly limited. At least, the mesh member 333 may be disposed so as to cover the upper opening of the chamber portion 4 so that the chamber portion 4 can communicate with the gap. That's fine. However, if the mesh member 333 extends longer to the downstream side than the upper opening of the chamber portion 4, the shear effect with the cylindrical body 31 is enhanced, and the mixing of the absorbent fibers and the water absorbent resin can be further promoted. it can.
- the mesh member 333 has a role of applying a shearing force to the material body 100 between the cylindrical body 31 and communicating the gap and the chamber portion 4, but these may be separated. . That is, a member (mixing part) in which irregularities are formed so as to apply a shearing force to the material body 100 between the cylindrical body 31 and a member that communicates the gap and the chamber part 4 separately from this are arranged. (Communication part) can also be arranged. In addition, unevenness can be formed on the cover member 332.
- the space between the cover member 332 and the cylindrical body 31 is passed through the material body 100 and then the space between the mesh member 333 and the cylindrical body 31 is passed.
- the absorbent fibers and the water-absorbent resin are dropped from the through holes on the downstream side of the mesh member 333. That is, following the gap in which the irregularities are formed only on one side, the gap in which the irregularities are formed on both sides is passed, and then the absorbent fibers and the water absorbent resin are dropped.
- the structure of such a gap is not particularly limited, and irregularities may be formed on both sides over the entire gap. Also, change the position as appropriate, for example, by first passing through the part where the unevenness is formed on both sides, or mixing the part where the unevenness is formed on both sides and the part where the unevenness is formed on one side You can also
- the shape of the chamber portion 4 is not particularly limited, but when the shape of the absorber 10 to be manufactured is larger than the upper opening of the chamber portion 4, it is a shape that spreads toward the bottom as described above. It is preferable. Further, the guide members 44 to 46 of the chamber portion 4 may be provided as necessary so that the absorbent fibers and the water absorbent resin are uniformly laminated, and are not necessarily required. The number and shape of the guide members can be changed as appropriate.
- the configuration of the transport unit 2 is not particularly limited, and may be other than the belt conveyor as described above, as long as the material body 100 can be guided to the mixing unit 3.
- Transport unit (i) Transport speed 1.6 (mm / sec) (2) Cylindrical body (i) Size ⁇ 70mm ⁇ 200mm (ii) Rotation speed 2700 rpm (iii) Concavity and convexity height 4mm (3) Gap forming part (i) Gap between cover member and cylinder 2mm (ii) 1 mm gap between the mesh member and the cylindrical body (iii) Position of mesh member Below cylindrical body over central angle of about 90 degrees (4) Chamber part (i) Upper end opening width 63mm (ii) Lower end opening width 380mm (iii) Height 440mm (5) Laminate part (i) Size of recess in frame member Width 120 x Length 400 mm (6) Suction unit (i) A vacuum cleaner operating at 100V is used as a suction device.
- a tissue paper (width 140 ⁇ length 420 mm) having a basis weight of 16 g / m 2 was placed on the laminated portion so that the absorbent fibers and the water absorbent resin could be laminated.
- 10 g of absorbent fibers were molded as an aggregate into a shape of width 125 ⁇ length 450 mm, and 10 g of the water-absorbent resin was manually dispersed uniformly thereon to form a material body.
- Reef rock manufactured by Leonia Co., Ltd. was used as the absorbent fiber
- Aqua Keep SA55SXII manufactured by Sumitomo Seika Co., Ltd. was used as the water absorbent resin.
- an absorbent body can be produced if there is about 10 g of the water absorbent resin, and the water absorbent resin can be evaluated in the state of the absorbent body.
- the evaluation can be made as an absorber. It is possible to use the manufacturing apparatus according to the embodiment.
- an air-through porous liquid permeable sheet made of polyethylene-polypropylene having the same size as the evaluation absorber and a basis weight of 22 g / m 2 was disposed on the upper surface of the evaluation absorber. Moreover, it was set as the absorbent article by arrange
- Example 2 water absorption resin 55 times water absorption type Aqua Keep SA55SXII manufactured by Sumitomo Seika Co., Ltd.
- Example 2 water absorption amount 60 times absorption type Sumitomo Seika Co., Ltd. Aqua Keep SA 60SXII used
- Example 3 was used. The results are as follows. Accordingly, it is understood that the amount of reversion is lower when the water absorption amount 60 times type is used, and the permeation time is faster when the water absorption amount 55 times type is used.
Abstract
Description
上記のように、本実施形態に係る吸収体及び材料体は、吸収性繊維と、吸水性樹脂とを備えている。以下、これらについて詳述する。
吸収性繊維は、例えば、細かく裁断・解砕された親水性繊維を用いることができる。親水性繊維としては、例えば、木材から得られる綿状パルプ、メカニカルパルプ、ケミカルパルプ、セミケミカルパルプ等のセルロース繊維;レーヨン、アセテート等の人工セルロース繊維;親水化処理されたポリアミド、ポリエステル、ポリオレフィン等の合成樹脂からなる繊維等が挙げられる。そして、吸収性繊維の集合体とは、多数の吸収性繊維を積層させたり、交絡させたりするなどして厚みのある形状、例えば、矩形状、円形状、多角形状としたものである。このような形状のものを1種類単独で使用してもよいし、2種類以上を組み合わせて使用してもよい。
吸水性樹脂としては、公知の吸水性樹脂を使用できる。吸水性樹脂の具体例としては、澱粉-アクリロニトリルグラフト共重合体の加水分解物、澱粉-アクリル酸グラフト重合体の中和物、酢酸ビニル-アクリル酸エステル共重合体のケン化物、アクリル酸部分中和物重合体の架橋物等の吸水性樹脂などが挙げられる。これらのうち、供給能力やコストなどの工業的な観点から、アクリル酸部分中和物重合体の架橋物が好ましい。吸水性樹脂は、1種類単独で使用してもよいし、2種類以上を組み合わせて使用してもよい。
吸水性樹脂の粉末50gに、滑剤として、0.25gの非晶質シリカ(デグサジャパン(株)、Siperant 200)を混合する。次に、JIS標準篩を上から、目開き850μmの篩、目開き600μmの篩、目開き500μmの篩、目開き425μmの篩、目開き300μmの篩、目開き250μmの篩、目開き150μmの篩及び受け皿の順に組み合わせる。次に、組み合わせた最上の篩に、前記混合物を入れ、ロータップ式振とう器を用いて20分間振とうさせて分級する。分級後、各篩上に残った混合物の質量を全量に対する質量百分率として計算し、粒子径の大きい方から順に積算することにより、篩の目開きと篩上に残った混合物の質量百分率の積算値との関係を対数確率紙にプロットする。確率紙上のプロットを直線で結ぶことにより、積算質量百分率50質量%に相当する粒子径を中位粒子径とする。
材料体は、種々の態様とすることができる。
(i) 吸収性繊維の集合体の上面に、吸水性樹脂を散置する。
(ii) 吸収性繊維の集合体の下面に、吸水性樹脂を散置する。
(iii) 吸収性繊維の集合体の上面に、吸水性樹脂を散置し、さらにその上に、吸収性繊維の集合体を配置する。
(iv) (iii)を複数積層する。つまり、吸収性繊維の集合体と、吸水性樹脂を交互に積層する。
(v) 吸収性繊維の集合体と吸水性樹脂との混合体を用いる。この混合体は、市販の吸収体を購入して得ること、市販の紙おむつから吸収体を取り出して得ることができる。あるいは、本発明の製造方法により吸収体を製造して得ることができる。
(vi) 後述する間隙に材料体を導入する方向(搬送方向)において、吸収性繊維の集合体の上流側(搬送方向の後ろ側)に吸水性樹脂を配置し、ベルトコンベアなどの搬送手段で間隙に向かって搬送する。
(vii)吸収性繊維の集合体の下流側(搬送方向の前側)に吸水性樹脂を配置し、ベルトコンベアなどの搬送手段で間隙に向かって搬送する。
続いて、吸収体の製造装置について、図面を参照しつつ説明する。図1は、この製造装置の概略構成を示す正面図、図2は図1の平面図である。以下では、便宜上、図1及び図2に示す向きを基準に説明を行うが、本発明に係る装置は、この向きによって限定されるものではない。
次に、上記のように、構成された製造装置の動作について説明する。まず、積層部5の空気流通部材52上に、通気性の高いシート部材(例えばティッシュや不織布)(図示省略)を配置する。これは、積層される吸収性繊維と吸水性樹脂が、空気流通部材52の細孔から抜け落ちるのを防止するためである。なお、吸引装置の電源を入れた際には上記シート部材がずれたりしないことを確認する。続いて、材料体100を準備する。材料体100の態様は、上述したように、種々のものがあるが、ここでは一例として図1に示すように、搬送ユニット2の搬送ベルト23上に、略矩形状に形成された吸収性繊維の集合体101を配置し、その上に、ベルトの進行方向に対し左右均等に吸水性樹脂102を散置する。但し、吸収性繊維の集合体101は、上記のように略矩形状以外の種々の形状にすることができる。
以上のように、本実施形態によれば、材料体100を少しずつ、高速で回転する円筒体31を有する混合ユニットに導入しているため、円筒体31の回転によって、材料体100が少しずつ切り離され、間隙に導入される。そして、間隙に導入された材料体100は、凹凸のある円筒体31とカバー部材332の間、及び円筒体31と網目部材333との間で擦られ、剪断力を受けながら混合される。その後、混合された吸収性繊維と吸水性樹脂とは落下し、凹部531内に均等に積層される。その結果、吸収性繊維と吸水性樹脂とが均一に混ざり、且つ、厚みが均等な吸収体を得ることができる。したがって、本実施形態に係る吸収体の製造装置は、小型の装置でありながら、商用の製造ラインと同様に、吸収性繊維と吸水性樹脂とが均一に混ぜ合わされた吸収体を製造することができる。すなわち、商用の製造ラインを用いることなく、これと同様の吸収体を簡易に製造できるため、本実施形態に係る吸収体を用いて、種々の吸水性能などの試験を行うことができる。
以上、本発明の実施形態について説明したが、本発明は上記実施形態に限定されるものではなく、その趣旨を逸脱しない限りにおいて、種々の変更が可能である。なお、以下の変形例は、適宜組合せ可能である。
網目部材333の,円筒体31の周方向の長さは、特には限定されず、少なくとも、チャンバー部4と間隙とを連通できるように、チャンバー部4の上部開口を覆うように配置されていればよい。但し、網目部材333が、チャンバー部4の上部開口よりも下流側に長く延びていれば、円筒体31との剪断効果が高まり、吸収性繊維と吸水性樹脂との混合をさらに促進することができる。
チャンバー部4の形状は、特には限定されないが、製造する吸収体10の形状が、チャンバー部4の上部開口よりも大きい場合には、上記のように下方にいくにしたがって裾広がりの形状であることが好ましい。また、チャンバー部4のガイド部材44~46は、吸収性繊維と吸水性樹脂が均一に積層されるように、必要に応じて設ければよく、必ずしも必要ではない。また、ガイド部材の数、形状も適宜変更可能である。
搬送ユニット2の構成は特には限定されず、上記のようなベルトコンベア以外でもよく、材料体100を混合ユニット3に案内できればよい。
まず、上記実施形態で示した製造装置を実施例として準備した。具体的な仕様は以下の通りである。
(1)搬送ユニット
(i) 搬送速度 1.6(mm/sec)
(2)円筒体
(i) サイズ φ70mm×200mm
(ii) 回転速度 2700回転/分
(iii) 凹凸の高さ 4mm
(3)間隙形成部
(i) カバー部材と円筒体との間隙 2mm
(ii) 網目部材と円筒体との間隙 1mm
(iii) 網目部材の位置 中心角約90度に亘る円筒体の下方
(4)チャンバー部
(i) 上端の開口幅 63mm
(ii) 下端の開口幅 380mm
(iii) 高さ 440mm
(5)積層部
(i) 枠部材の凹部の大きさ 幅120×長さ400mm
(6)吸引部
(i)100Vで稼動する掃除機を吸引装置とした
まず、積層部に坪量16g/m2のティッシュッペーパー(幅140×長さ420mm)を載置して吸収性繊維と吸水性樹脂が積層できるように準備した。ついで、10gの吸収性繊維を幅125×長さ450mmの形状に集合体として成形し、この上に、10gの吸水性樹脂を手動で均一に分散させ、材料体を形成した。吸収性繊維としてレオニア社製レイフロックを用い、吸水性樹脂として住友精化株式会社製 アクアキープSA55SXIIを用いた。次に、この材料体を上記製造装置の搬送ユニットに配置した上で、すべてのモータと吸引装置を駆動した。そして、すべての材料体が混合ユニットに導入された後、混合された吸収性繊維及び吸水性樹脂が積層部で積層されるのを待ち、図4に示す吸収体を得た。
(1)外観の評価
上記の吸収体の製造において、視認しやすいようにあらかじめ赤色に着色しておいた吸水性樹脂を用いた吸収体で、外観の評価を行なった。図4に示すように、この吸収体では、吸収性繊維に吸水性樹脂が均一に混合されていることが分かる(図中の白が吸収性繊維を示し、灰色の部分が吸水性樹脂を示す)。すなわち、吸水性樹脂が、図4(a)に示すように、面方向に均一に分布するとともに、図4(b)に示すように、厚み方向においても、均一に分布している。
(2-1)以下の手順に従って、この吸収体の吸水試験を行った。
(i) 得られた吸収体を図5に示すように、縦方向及び横方向にそれぞれ3等分し、9分割して吸収体片を作製し、それぞれの重量C(g)を測定した。
(ii) 各吸収体片をそれぞれ8Lのイオン交換水に浸漬させ、30分間放置した。(浸漬直後に10秒間攪拌して分散させた。)
(iii) イオン交換水に分散させた各吸収体片を、それぞれ予め秤量した標準篩(直径20cm,目開き75μm)で濾別し、この標準篩を30分間を斜めに傾けて、水切りを行った。
(iv) 標準篩ごと吸収体片の重量を測定し、吸水した吸収体片重量D(g)を求めた。
(v) 下記(2-2)(2-3)で示すように算出した吸水性樹脂のイオン交換水吸水能A(g/g)と吸収性繊維のイオン交換水吸水能B(g/g)を用い、次式によって各吸収体片中の吸水性樹脂の含量を計算する。
吸水性樹脂の重量=X(g)、吸収性繊維の重量=Y(g)とすると、以下の式(1)(2)が成り立つ。
X+Y=C (1)
AX+BY=D (2)
そして、これら式(1)(2)より、X,Yが以下のように、算出できる。
X=(D-BC)/(A-B)
Y=C-X
(i) 1000mlのイオン交換水をビーカーに入れる。
(ii) 吸水性樹脂0.5gをビーカー中のイオン交換水に加え、30分間静置した。
(iii) 吸水した吸水性樹脂を予め秤量した標準篩に移し、この標準篩を30分間斜めに傾け水切りを行った。
(iv) 標準篩上の吸水性樹脂の重量(m)を測定し、次式(3)より吸水性樹脂のイオン交換水吸水能A(g/g)を求めた。
A(g/g)=m(g)/0.5(g) (3)
(i) 1000mlのイオン交換水をビーカーに入れる。
(ii) 吸収性繊維1.0gをビーカー中のイオン交換水に加える。
(iii) 30分間静置する。
(iv) 吸水した吸収性繊維を予め秤量した標準篩に移し、この標準篩を30分間斜めに傾け水切りを行った。
(v) 標準篩上の吸収性繊維の重量(m)を測定し、吸収性繊維のイオン交換水吸水能B(g/g)とした。
まず、実施例に係る製造装置により、2つの吸収体(サンプルNo.1,2)を製造し、それぞれについて吸収体総重量(g)を測量した。別途、吸収体の作成に用いた吸水性樹脂のイオン交換水吸水能A、及び吸収性繊維のイオン交換水吸水能B(g/g)を測定・算出した。結果は、以下に示すとおりである。
・吸水性樹脂のイオン交換水吸水能A=355.3(g/g)
・吸収性繊維のイオン交換水吸水能B=15.0(g/g)
・サンプルNo.1の吸収体総重量:19.85(g)
・サンプルNo.2の吸収体総重量:19.67(g)
次に、上記実施例で作成した吸収体の評価試験を行った。具体的には、人工尿を用い、以下に示す評価試験を行った。
10L容の容器に適量の蒸留水を入れ、塩化ナトリウム60g、塩化カルシウム・二水和物1.8g、及び塩化マグネシウム・六水和物3.6gを添加し、溶解した。次いで、ポリオキシエチレンノニルフェニルエーテル0.15gを添加し、さらに蒸留水を追加して、全体の質量を6000gとした。さらに、少量の青色1号で着色して、人工尿を調製した。
吸水性樹脂10gと吸収性繊維として解砕パルプ(レオニア社製,レイフロック)10gを用い、上述の実施例「吸収体の製造」に準じて、長さ40cm×幅12cmの大きさのシート状の吸収体を作製した。次に、得られた吸収体に霧吹きで約0.6gの水を全体に散布した。その後、この吸収体の上に、吸収体と同じ大きさで坪量16g/m2のティッシュッペーパーを重ね、全体に196kPaの荷重を30秒間加えてプレスすることにより、評価用吸収体を作製した。さらに、この評価用吸収体の上面に、評価用吸収体と同じ大きさで、坪量22g/m2のポリエチレン-ポリプロピレン製エアスルー型多孔質液体透過性シートを配置した。また、同じ大きさ、同じ坪量のポリエチレン製液体不透過性シートを評価用吸収体の下面に配置して評価用吸収体を挟みつけることにより、吸収性物品とした。
次に、上記吸収性物品を用い、以下の評価試験を行った。
水平の台上に吸収性物品を置き、その吸収性物品の中心部に、内径3cmの液投入用シリンダーを具備した測定器具を置いた。そして、50mLの人工尿をそのシリンダー内に一度に投入するとともに、ストップウォッチを用いて、人工尿がシリンダー内から完全に消失するまでの時間を測定し、1回目の浸透時間(秒)とした。次に、シリンダーを取り除き、吸収性物品をそのままの状態で保存し、1回目の人工尿投入開始から30分後及び60分後にも、1回目と同じ位置に測定器具を用いて同様の操作を行い、2回目及び3回目の浸透時間(秒)を測定した。そして、1回目~3回目の合計時間を合計浸透時間とした。浸透時間が短いほど、吸収性物品として好ましいと言える。
上述した浸透時間の測定における1回目の試験液投入開始から120分後、吸収性物品上の人工尿投入位置付近に、予め質量(Wd(g))を測定しておいた10cm四方の濾紙80枚程度を置き、その上に底面が10cm×10cmの質量5kgの重りを載せた。5分間の荷重後、濾紙の質量(We(g))を測定し、以下の式のとおり、増加した質量を逆戻り量(g)とした。なお、逆戻り量が小さいほど、吸収性物品として好ましいと言える。
逆戻り量(g)=We-Wd
上述した逆戻り量の測定後5分以内に、人工尿が浸透した吸収性物品の長手方向の拡がり寸法(cm)を測定した。人工尿を投入した中心部から両長手方向に広がった液の両端は短手方向において拡散距離にバラツキが生じるため、長手方向に対し青い人工尿の広がった距離の最大長さを“拡散長”として測定し、小数点以下の数値は四捨五入した。
3 :混合ユニット
4 :チャンバー部
5 :積層部
6 :吸引ユニット
10 :吸収体
31 :円筒体
33 :間隙形成部
333 :網目部材(板状材)
40 :内部空間
52 :空気流通部材
53 :枠部材
100 :材料体
101 :吸収性繊維
102 :吸水性樹脂
531 :凹部
Claims (12)
- 吸収性繊維の集合体、及び吸水性樹脂を、搬送する搬送ユニットと、
前記搬送ユニットにより搬送された吸収性繊維の集合体、及び吸水性樹脂を受け入れ、前記吸収性繊維及び前記吸水性樹脂を混合する混合ユニットと、
前記混合ユニットで混合された前記吸収性繊維及び前記吸水性樹脂が落下する内部空間を有するチャンバー部と、
前記チャンバー部の下方に配置され、当該チャンバー部内を落下する前記吸収性繊維及び前記吸水性樹脂が積層される凹部を有する積層部と、
前記チャンバー部内に負圧を生じさせる吸引ユニットと、
を備え、
前記混合ユニットは、
回転可能に支持され、外周面に凹凸が形成された円筒体と、
前記円筒体を回転する駆動部と、
前記円筒体の外周面との間に、前記搬送ユニットから搬送された吸収性繊維の集合体、及び吸水性樹脂が通過する間隙を形成し、当該間隙が前記吸収性繊維の集合体の厚みよりも小さい、間隙形成部と、
を備え、
前記間隙形成部は、
前記円筒体の下方に位置し、複数の貫通孔が形成され、当該複数の貫通孔を介して前記間隙と前記チャンバー部の内部空間を連通させる、連通部と、
少なくとも前記連通部の上流側に配置され、前記円筒体の外周面と対向する凹凸が形成された混合部と、
を備えている、吸収体の製造装置。 - 前記吸水性樹脂は、前記吸収性繊維の集合体に接して散置されている、請求項1に記載の吸収体の製造装置。
- 前記吸収性繊維の集合体に接して散置されている前記吸水性樹脂は、当該吸収性繊維の上面に散置されている、請求項2に記載の吸収体の製造装置。
- 前記吸水性樹脂は、前記吸収性繊維の集合体とは異なるタイミングで前記間隙に導入される、請求項1に記載の吸収体の製造装置。
- 前記間隙形成部は、網目状の板状材を有し、
前記板状材は、前記間隙を形成するために、前記円筒体の外周面と対向するように配置され、前記連通部及び混合部を構成する、請求項1から4のいずれかに記載の吸収体の製造装置。 - 前記チャンバー部は、下方にいくにしたがって、形状が大きくなるように形成されている、請求項1から5のいずれかに記載の吸収体の製造装置。
- 前記搬送ユニットと前記混合ユニットとの間には、前記間隙に進入する前の前記吸収性繊維の集合体を押圧する押圧部材が設けられ、
当該押圧部材は、前記吸収性繊維の集合体を押圧する方向に付勢されている、請求項1から6のいずれかに記載の吸収体の製造装置。 - 前記混合ユニットにおける円筒体の周速度は、前記搬送ユニットにより前記吸収性繊維の集合体、及び吸水性樹脂を前記混合ユニットへ搬送する搬送速度よりも大きい、請求項1から7のいずれかに記載の吸収体の製造装置。
- 前記チャンバー部の内部空間は、前記吸収性繊維及び前記吸水性樹脂を下方へと案内する少なくとも1つの案内部材を備えている、請求項1から8のいずれかに記載の吸収体の製造装置。
- 前記積層部は、複数の貫通孔が形成された板状の空気流通部材と、前記空気流通部材の上に配置され、前記凹部を形成する枠部材と、を備え、
前記吸引ユニットは、前記空気流通部材を介して、前記内部空間から空気を吸引している、請求項1から9のいずれかに記載の吸収体の製造装置。 - 前記積層部は、前記チャンバー部の側面を構成する壁体から取り外し可能に構成されている、請求項1から10のいずれかに記載の吸収体の製造装置。
- 前記チャンバー部が、上下方向の長さは10~100cmであり、横方向の最大長さは10~100cmである、請求項1から11いずれかに記載の吸収体の製造装置。
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