WO2022260156A1 - カプセル製造方法及びカプセル製造装置 - Google Patents
カプセル製造方法及びカプセル製造装置 Download PDFInfo
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- WO2022260156A1 WO2022260156A1 PCT/JP2022/023403 JP2022023403W WO2022260156A1 WO 2022260156 A1 WO2022260156 A1 WO 2022260156A1 JP 2022023403 W JP2022023403 W JP 2022023403W WO 2022260156 A1 WO2022260156 A1 WO 2022260156A1
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- Prior art keywords
- cylindrical body
- wall material
- liquid
- capsule
- guide groove
- Prior art date
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- FWLDHHJLVGRRHD-UHFFFAOYSA-N decyl prop-2-enoate Chemical compound CCCCCCCCCCOC(=O)C=C FWLDHHJLVGRRHD-UHFFFAOYSA-N 0.000 description 1
- 125000004386 diacrylate group Chemical group 0.000 description 1
- 229960004679 doxorubicin Drugs 0.000 description 1
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 description 1
- ZLNAFSPCNATQPQ-UHFFFAOYSA-N ethenyl-dimethoxy-methylsilane Chemical compound CO[Si](C)(OC)C=C ZLNAFSPCNATQPQ-UHFFFAOYSA-N 0.000 description 1
- SUPCQIBBMFXVTL-UHFFFAOYSA-N ethyl 2-methylprop-2-enoate Chemical compound CCOC(=O)C(C)=C SUPCQIBBMFXVTL-UHFFFAOYSA-N 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
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- 235000019382 gum benzoic Nutrition 0.000 description 1
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- 239000004310 lactic acid Substances 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- PBOSTUDLECTMNL-UHFFFAOYSA-N lauryl acrylate Chemical compound CCCCCCCCCCCCOC(=O)C=C PBOSTUDLECTMNL-UHFFFAOYSA-N 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- CDOSHBSSFJOMGT-UHFFFAOYSA-N linalool Chemical compound CC(C)=CCCC(C)(O)C=C CDOSHBSSFJOMGT-UHFFFAOYSA-N 0.000 description 1
- 235000020778 linoleic acid Nutrition 0.000 description 1
- OYHQOLUKZRVURQ-IXWMQOLASA-N linoleic acid Natural products CCCCC\C=C/C\C=C\CCCCCCCC(O)=O OYHQOLUKZRVURQ-IXWMQOLASA-N 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
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- 235000001035 marshmallow Nutrition 0.000 description 1
- 150000004667 medium chain fatty acids Chemical class 0.000 description 1
- ZQMHJBXHRFJKOT-UHFFFAOYSA-N methyl 2-[(1-methoxy-2-methyl-1-oxopropan-2-yl)diazenyl]-2-methylpropanoate Chemical compound COC(=O)C(C)(C)N=NC(C)(C)C(=O)OC ZQMHJBXHRFJKOT-UHFFFAOYSA-N 0.000 description 1
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- 239000000203 mixture Substances 0.000 description 1
- SFLRURCEBYIKSS-UHFFFAOYSA-N n-butyl-2-[[1-(butylamino)-2-methyl-1-oxopropan-2-yl]diazenyl]-2-methylpropanamide Chemical compound CCCCNC(=O)C(C)(C)N=NC(C)(C)C(=O)NCCCC SFLRURCEBYIKSS-UHFFFAOYSA-N 0.000 description 1
- NPFIXJIFUHTLRP-UHFFFAOYSA-N n-cyclohexyl-2-methylpropanamide Chemical compound CC(C)C(=O)NC1CCCCC1 NPFIXJIFUHTLRP-UHFFFAOYSA-N 0.000 description 1
- NZIDBRBFGPQCRY-UHFFFAOYSA-N octyl 2-methylprop-2-enoate Chemical compound CCCCCCCCOC(=O)C(C)=C NZIDBRBFGPQCRY-UHFFFAOYSA-N 0.000 description 1
- ANISOHQJBAQUQP-UHFFFAOYSA-N octyl prop-2-enoate Chemical compound CCCCCCCCOC(=O)C=C ANISOHQJBAQUQP-UHFFFAOYSA-N 0.000 description 1
- FZUGPQWGEGAKET-UHFFFAOYSA-N parbenate Chemical compound CCOC(=O)C1=CC=C(N(C)C)C=C1 FZUGPQWGEGAKET-UHFFFAOYSA-N 0.000 description 1
- GYDSPAVLTMAXHT-UHFFFAOYSA-N pentyl 2-methylprop-2-enoate Chemical compound CCCCCOC(=O)C(C)=C GYDSPAVLTMAXHT-UHFFFAOYSA-N 0.000 description 1
- ULDDEWDFUNBUCM-UHFFFAOYSA-N pentyl prop-2-enoate Chemical compound CCCCCOC(=O)C=C ULDDEWDFUNBUCM-UHFFFAOYSA-N 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 229920000779 poly(divinylbenzene) Polymers 0.000 description 1
- 229920000747 poly(lactic acid) Polymers 0.000 description 1
- 229920001610 polycaprolactone Polymers 0.000 description 1
- 239000004632 polycaprolactone Substances 0.000 description 1
- 239000004633 polyglycolic acid Substances 0.000 description 1
- 239000004626 polylactic acid Substances 0.000 description 1
- 229920000193 polymethacrylate Polymers 0.000 description 1
- 229920003053 polystyrene-divinylbenzene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- HJWLCRVIBGQPNF-UHFFFAOYSA-N prop-2-enylbenzene Chemical compound C=CCC1=CC=CC=C1 HJWLCRVIBGQPNF-UHFFFAOYSA-N 0.000 description 1
- LYBIZMNPXTXVMV-UHFFFAOYSA-N propan-2-yl prop-2-enoate Chemical compound CC(C)OC(=O)C=C LYBIZMNPXTXVMV-UHFFFAOYSA-N 0.000 description 1
- NHARPDSAXCBDDR-UHFFFAOYSA-N propyl 2-methylprop-2-enoate Chemical compound CCCOC(=O)C(C)=C NHARPDSAXCBDDR-UHFFFAOYSA-N 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- YRHRIQCWCFGUEQ-UHFFFAOYSA-N thioxanthen-9-one Chemical class C1=CC=C2C(=O)C3=CC=CC=C3SC2=C1 YRHRIQCWCFGUEQ-UHFFFAOYSA-N 0.000 description 1
- 229960000984 tocofersolan Drugs 0.000 description 1
- UFTFJSFQGQCHQW-UHFFFAOYSA-N triformin Chemical compound O=COCC(OC=O)COC=O UFTFJSFQGQCHQW-UHFFFAOYSA-N 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- NLVXSWCKKBEXTG-UHFFFAOYSA-N vinylsulfonic acid Chemical compound OS(=O)(=O)C=C NLVXSWCKKBEXTG-UHFFFAOYSA-N 0.000 description 1
- 229940088594 vitamin Drugs 0.000 description 1
- 239000011782 vitamin Substances 0.000 description 1
- 229930003231 vitamin Natural products 0.000 description 1
- 235000013343 vitamin Nutrition 0.000 description 1
- 150000003722 vitamin derivatives Chemical class 0.000 description 1
- 239000002076 α-tocopherol Substances 0.000 description 1
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
- B01J13/02—Making microcapsules or microballoons
- B01J13/04—Making microcapsules or microballoons by physical processes, e.g. drying, spraying
- B01J13/046—Making microcapsules or microballoons by physical processes, e.g. drying, spraying combined with gelification or coagulation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
- B01J13/02—Making microcapsules or microballoons
- B01J13/20—After-treatment of capsule walls, e.g. hardening
- B01J13/22—Coating
Definitions
- the present invention relates to a capsule manufacturing method and a capsule manufacturing apparatus.
- a capsule having a structure in which an encapsulated substance is covered with a wall material is known.
- Encapsulated substances are, for example, desired substances such as agricultural chemicals, inks, and pharmaceuticals.
- the wall material plays a role of enhancing the handleability of the encapsulated substance, protecting the encapsulated substance from the external environment, and controlling the release rate of the encapsulated substance.
- Patent Document 1 proposes the capsule manufacturing method described below. First, a droplet of a raw material liquid containing a monomer liquid or a polymer liquid, which is a precursor of the wall material, and an inclusion substance is dropped onto the surface of a flat plate. Dropped droplets retain their spherical shape due to surface tension. Next, the monomer liquid or polymer liquid is solidified to form a wall material. This completes the capsule.
- An object of the present invention is to provide a capsule manufacturing method capable of efficiently manufacturing capsules, and a capsule manufacturing apparatus that can be used to implement the capsule manufacturing method.
- the capsule manufacturing method comprises: A capsule manufacturing method using a cylindrical body formed in a cylindrical shape surrounding a virtual center line and having a spiral or circular guide groove formed on the inner surface around the virtual center line, a dropping step of dropping an encapsulation substance and a wall material precursor liquid, which is a precursor of a wall material covering the encapsulation substance, onto the inner surface of the cylindrical body; A droplet dropped in the dropping step rolls in the guide groove of the cylindrical body rotating around the virtual center line, thereby progressing encapsulation of the inclusion substance and the wall material precursor liquid. an encapsulation step; a capsule discharging step in which the capsule obtained by the progress of the encapsulation is discharged from the cylindrical body; have
- the surface of the guide groove of the cylindrical body may have liquid repellency with respect to the liquid droplets.
- the amount of the droplet dropped at one time in the dropping step is 15 ⁇ L or less
- a circumferential velocity of the inner surface of the cylindrical body in the dropping step and the encapsulating step may be 0.08 m/s or more and 0.24 m/s or less.
- the wall material precursor liquid has a gelling property
- the encapsulation may proceed by the gelation of the wall material precursor liquid.
- the wall material precursor liquid contains a monomer
- Said encapsulation may proceed by polymerization of said monomers.
- the wall material precursor liquid contains a solvent
- Said encapsulation may proceed by removal of said solvent.
- the capsule manufacturing apparatus includes: a cylindrical body formed in a cylindrical shape surrounding a virtual center line and having a spiral or circular guide groove formed on the inner surface around the virtual center line; a rotating device that rotates the cylindrical body around the virtual center line; a dropping device for dropping an encapsulation substance and a wall material precursor liquid, which is a precursor of a wall material covering the encapsulation substance, onto the inner surface of the cylindrical body; with The encapsulation of the encapsulation substance and the wall material precursor liquid progresses by the droplets dropped by the dropping device rolling in the guide groove of the cylindrical body rotated by the rotating device.
- the amount of droplets dropped by the dropping device at one time may be 15 ⁇ L or less.
- a solidification promoting device for promoting solidification of the wall material precursor liquid in the droplets rolling in the guide groove of the cylinder; may be further provided.
- capsules can be efficiently manufactured.
- FIG. 2 is a conceptual diagram showing the essential parts of the dropping device according to the first embodiment
- 4 is a flow chart of manufacturing capsules according to the first embodiment. Sectional drawing which expanded and showed the guide groove in the cylinder which concerns on 1st Embodiment.
- a micrograph of a capsule according to Example A1. A micrograph of a capsule according to Example A2.
- Micrograph of a capsule according to Example B Sectional drawing which expanded and showed the guide groove in the cylinder which concerns on 2nd Embodiment.
- the conceptual diagram which shows the structure of the capsule manufacturing apparatus which concerns on 3rd Embodiment.
- FIG. 1A An example of the capsule 10 is shown in FIG. 1A.
- This capsule 10 has a structure in which an encapsulated substance 11 is covered with a wall material 12 .
- the encapsulated substance 11 is collectively present in one continuous region inside the capsule 10 .
- such a form will be referred to as "mononuclear”.
- the inclusion substance 11 is, for example, a desired substance such as an agricultural chemical, ink, or a medicine.
- the wall material 12 plays a role of enhancing the handleability of the inclusion substance 11 , protecting the inclusion substance 11 from the external environment, and controlling the release rate of the inclusion substance 11 .
- FIG. 1B shows another example of the capsule 10.
- the encapsulated substance 11 is distributed discretely in a plurality of regions inside the capsule 10 .
- multinucleate such a form will be referred to as "multinucleate”.
- FIG. 1C shows still another example of the capsule 10.
- the inside of the capsule 10 is filled with one type of composite matrix 13 having a continuous texture.
- the composite matrix 13 is a mixture of the inclusion substance 11 and the wall material 12 described above at the molecular level. Even if the capsule 10 according to this example is observed with an electron microscope, it is difficult to confirm the boundary between the encapsulated substance 11 and the wall material 12 .
- the structure shown in FIG. 1C is also called “bead”. However, in this specification, the concept of “capsules” also includes “beads”. In addition, the concept of “capsule” also includes a structure in which the mononuclear encapsulating substance 11 shown in FIG. 1A or the polynuclear encapsulating substance 11 shown in FIG. 1B is covered with the composite matrix 13 shown in FIG. 1C. do. The concept of "capsule” also includes a structure in which the wall material 12 shown in FIG. 1A or 1B and the composite matrix 13 shown in FIG. 1C coexist.
- the diameter of the capsule 10 described above is typically 10 ⁇ m or more and 1 cm or less, more specifically 100 ⁇ m or more and 5 mm or less.
- the diameter of the capsule 10 can be measured by observation with a stereomicroscope or laser diffraction scattering method.
- the capsule manufacturing apparatus for manufacturing the capsules 10 will be described below.
- the capsule manufacturing apparatus 100 includes a rotating cylinder 110, a rotating device 120 that rotates the rotating cylinder 110, and a rotating cylinder 110 that is rotated by the rotating device 120. and a dropping device 130 for lowering the raw material liquid 20, which is a precursor.
- the rotating cylinder 110 has a cylindrical body 111 formed in a cylindrical shape surrounding the imaginary center line VL, and a rotating shaft 113 fixed to the cylindrical body 111 .
- the rotating shaft 113 is fixed to one end of the cylindrical body 111 in the longitudinal direction parallel to the imaginary center line VL.
- the rotating shaft 113 extends on the virtual centerline VL.
- a guide groove 112 is formed on the inner surface of the cylindrical body 111 so as to spirally extend around the virtual center line VL.
- the guide groove 112 is formed from one longitudinal end to the other longitudinal end of the cylindrical body 111 .
- the rotating cylinder 110 is arranged in a sideways posture in which the rotating shaft 113 is laid sideways. Specifically, in the present embodiment, the rotating cylinder 110 is laid horizontally, and the length direction of the cylindrical body 111 coincides with the horizontal direction.
- the rotating device 120 rotates the cylindrical body 111 around the virtual center line VL through the rotating shaft 113 .
- the dropping device 130 is arranged at the end opposite to the end to which the rotating shaft 113 is fixed with respect to the length direction of the cylindrical body 111 .
- the dropping device 130 has an inner tube 131 and an outer tube 132 surrounding the inner tube 131 concentrically with the inner tube 131 .
- a double pipe is configured by the inner pipe 131 and the outer pipe 132 .
- the inner tube 131 discharges the liquid inclusion substance 11 .
- the outer tube 132 discharges the wall material precursor liquid 21, which is the precursor of the wall material 12 shown in FIG. 1A.
- the discharge of the inclusion substance 11 from the inner tube 131 and the discharge of the wall material precursor liquid 21 from the outer tube 132 are performed in parallel.
- droplets of the raw material liquid 20 in which the liquid inclusion substance 11 is covered with the wall material precursor liquid 21 are repeatedly dropped from the dropping device 130 .
- the diameter of the droplet of one raw material liquid 20 is, for example, 0.1 mm or more and 5 mm or less.
- the dropped droplets of the raw material liquid 20 land on the inner surface of the cylindrical body 111 shown in FIG.
- the distance between the tips of the inner tube 131 and the outer tube 132 of the dropping device 130 and the inner surface of the cylindrical body 111 is preferably 5 cm or less, more preferably 2.5 cm or less, and 1.5 cm or less. It is more preferable to have By solidifying the droplets of the raw material liquid 20, the capsule 10 shown in FIG. 1A is formed.
- the powder of solid fine particles 30 is arranged on the inner surface of the cylindrical body 111 (powder arrangement step S1).
- the powder of solid fine particles 30 is also arranged in the guide groove 112 .
- droplets of the raw material liquid 20 are successively dropped onto the inner surface of the cylindrical body 111 by the dropping device 130 (dropping step S2).
- the amount of droplets dropped by the dropping device 130 at one time is, for example, 15 ⁇ L or less.
- the solid fine particles 30 play a role of stabilizing the shape of the droplets of the raw material liquid 20 into a spherical shape and a role of suppressing the coalescence of a plurality of droplets of the raw material liquid 20. .
- each of the rolling liquid marbles 40 swings in the circumferential direction of the cylindrical body 111 while moving in one direction parallel to the imaginary center line VL shown in FIG. , it moves in the direction from the dropping device 130 toward the rotating shaft 113 .
- encapsulation progresses in the process of the movement (encapsulation step S3).
- encapsulation means that the inclusion substance 11 and the wall material precursor liquid 21 approach the capsule 10 in form.
- concept of “encapsulation” includes solidification of the wall material precursor liquid 21 in the liquid marble 40 .
- capsule discharge step S4 For example, from a droplet of the raw material liquid 20 of 1 ⁇ L or more and 10 ⁇ L, a capsule 10 having a diameter of about 1.0 mm or more and 3 mm or less is obtained.
- solid fine particles 30 adhere to the capsule 10 ejected from the cylindrical body 111 . Therefore, if necessary, after the capsule discharging step S4, the solid fine particles 30 adhering to the capsule 10 may be removed (solid fine particle removing step S5).
- droplets of each raw material liquid 20 roll in the guide groove 112 in the form of liquid marbles 40 and move in one direction within the cylindrical body 111 . Therefore, coalescence of droplets of the raw material liquid 20 can be suppressed, and a large number of capsules 10 can be produced efficiently.
- the droplets of the raw material liquid 20 are sprinkled with the solid fine particles 30 and the wall material precursor liquid 21 is solidified continuously. This also contributes to efficient production of a large number of capsules 10 .
- the capsules 10 with high sphericity can be obtained.
- the sphericity is an evaluation index representing the closeness of the shape of the capsule 10 to the shape of a true sphere.
- the wall material precursor liquid 21 has a mass Even if the density is higher than the density of the encapsulated substance 11 , the position of the encapsulated substance 11 is less likely to be biased inside the resulting capsule 10 .
- the solid fine particles 30 have a smaller diameter than the droplets of the raw material liquid 20 dropped from the dropping device 130 .
- the diameter of the solid fine particles 30 is small enough to cover the droplets of the raw material liquid 20 .
- the diameter of the solid fine particles 30 is, for example, 0.01 ⁇ m or more and 500 ⁇ m or less, preferably 1 ⁇ m or more and 300 ⁇ m or less.
- the diameter of the solid fine particles 30 refers to a number-based average particle diameter measured by observation with a stereoscopic microscope or laser diffraction scattering method.
- the solid fine particles 30 preferably have an appropriate liquid repellency with respect to the wall material precursor liquid 21 in order to stably coat the droplets of the raw material liquid 20 .
- the solid fine particles 30 preferably exhibit a contact angle of 70° or more, preferably 100° or more, with respect to the wall material precursor liquid 21 .
- water-repellent solid fine particles 30 that exhibit a contact angle of 70° or more, preferably 100° or more, with water can be used.
- the water-repellent solid fine particles 30 include fine particles such as fluorine resin such as polytetrafluoroethylene, alkylated silica particles, carbon black, polyvinylidene fluoride, and poly[2-(perfluorooctyl)ethyl acrylate]. .
- an airgel or xerogel silicone monolith having a polysiloxane structure can be used as the water-repellent solid fine particles 30, for example.
- a silicone monolith is produced by, for example, using both a bifunctional alkoxysilane and a trifunctional alkoxysilane or a tetrafunctional or higher alkoxysilane as starting materials, and copolymerizing these silanes by a sol-gel reaction. can be obtained with Examples of such silicone monoliths include airgel or xerogel silicone monoliths obtained from vinyltrimethoxysilane and methylvinyldimethoxysilane. Such materials are described in Hayase et al. (Angew Chem Int Ed Engl. 2013, 52 (41), 10788-10791).
- Solid fine particles 30 having water and oil repellency can also be used.
- water- and oil-repellency means having water repellency and oil repellency.
- the solid fine particles 30 exhibiting a contact angle of 70° or more, preferably 100° or more with respect to water and a contact angle of 70° or more, preferably 100° or more with respect to n-hexadecane are water-repellent. It can be said that it has oiliness.
- the water-repellent and oil-repellent solid fine particles 30 for example, a material having a polysiloxane structure and a perfluoroalkyl structure, preferably an airgel or xerogel silicone monolith body having a polysiloxane structure and a perfluoroalkyl structure can be used.
- a material having a polysiloxane structure and a perfluoroalkyl structure preferably an airgel or xerogel silicone monolith body having a polysiloxane structure and a perfluoroalkyl structure
- marshmallow gel which is a flexible porous material exhibiting water and oil repellency, described in Hayase et al.'s report (Angew Chem Int Ed Engl. 2013, 52(41), 10788-10791) is used. be able to.
- fine particles of carbon, polyvinylidene fluoride, or the like whose surface is modified with a perfluoroalkyl group can be used
- the wall material precursor liquid 21 is hydrophobic and the solid fine particles 30 are water- and oil-repellent, or the wall material precursor liquid 21 is hydrophilic.
- the solid fine particles 30 are preferably water- and oil-repellent or water-repellent.
- Encapsulation in the present embodiment, specifically solidification of the wall material precursor liquid 21, includes, for example, (a) gelation of the wall material precursor liquid 21, (b) polymerization of the wall material precursor liquid 21, and (c) wall material precursor liquid 21. It can be realized by removing the solvent contained in the precursor liquid 21 or by a combination of any two or more selected from (a) to (c).
- the capsule manufacturing apparatus 100 may include a solidification promoting device 140 that facilitates solidification as described above.
- the solidification promoting device 140 promotes solidification of the wall material precursor liquid 21 in the liquid marbles 40 moving in one direction within the cylindrical body 111 in the encapsulation step S3 described above. A specific description will be given below.
- the solidification promoting device 140 is applied to the liquid marbles 40 moving in one direction inside the cylindrical body 111. to give a temperature change. This promotes gelation of the wall material precursor liquid 21 .
- the solidification acceleration device 140 cools or heats the liquid marble 40 . Cooling can be achieved by, for example, a Peltier element, a refrigeration cycle, or the like. Heating can be achieved by, for example, a Peltier element, an infrared lamp, or the like.
- the capsule manufacturing apparatus 100 is placed in a room temperature environment of, for example, 15° C. or higher and 25° C. or lower, and the wall material precursor liquid 21 is preheated to a temperature higher than room temperature, or the wall material precursor liquid 21 is preheated to a temperature lower than room temperature. If the wall material precursor liquid 21 cooled to room temperature naturally causes gelation of the wall material precursor liquid 21 as it asymptotically approaches room temperature, the solidification acceleration device 140 is unnecessary.
- the solidification promoting device 140 causes the liquid marbles 40 moving in one direction inside the cylindrical body 111 to polymerize the wall material precursor liquid 21 . Treat to accelerate.
- the solidification acceleration device 140 irradiates the liquid marble 40 with the light.
- the light emitted from the outside of the cylindrical body 111 may pass through the cylindrical body 111 and enter the liquid marble 40 .
- the wavelength of light is, for example, 380 nm-780 nm.
- the solidification acceleration device 140 heats the liquid marble 40 .
- the heating temperature is, for example, 30°C-80°C.
- the solidification acceleration device 140 is unnecessary.
- hydrophobic monomers and hydrophilic monomers can be used as monomers.
- a hydrophobic monomer refers to a monomer with a solubility in water at 25°C of less than 2% by mass
- a hydrophilic monomer refers to a monomer with a solubility in water at 25°C of 2% by mass or more.
- Hydrophobic monomers include, for example, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, n-amyl acrylate, isoamyl acrylate, n-hexyl acrylate, 2-ethylhexyl acrylate, n-octyl acrylate, decyl acrylate, dodecyl acrylate, and the like.
- polyfunctional acrylate such as ethylene glycol diacrylate, polyethylene glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol tetraacrylate; ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, n-amyl methacrylate, n- monofunctional methacrylates such as hexyl methacrylate, 2-ethylhexyl methacrylate, n-octyl methacrylate, and decyl methacrylate; polyfunctional methacrylates such as ethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, and pentaerythritol tetramethacrylate; styrene, ⁇ -Styrenic monomers such as methylstyrene, vinyltolu
- Hydrophobic monomers may be used alone or in combination of two or more. From the viewpoint of the mechanical strength of the wall material 12 of the capsule 10, (meth)acrylate, styrene and divinylbenzene are preferable as the hydrophobic monomer. As used herein, (meth)acrylate means monofunctional or polyfunctional acrylate and/or methacrylate.
- hydrophilic monomers examples include acrylic acid, methacrylic acid, maleic acid, fumaric acid, vinylsulfonic acid, styrenesulfonic acid, vinyl alcohol, acrylamide, and methacryloxyethyl phosphate. Hydrophilic monomers may be used alone or in combination of two or more.
- the wall material precursor liquid 21 contains components other than the monomers, such as a polymerization initiator such as a thermal polymerization initiator or a photopolymerization initiator, a solvent for dissolving or dispersing the monomers, a surfactant, an ultraviolet absorber, and light. Stabilizers, antioxidants, flame retardants, plasticizers, waxes and the like may also be included.
- a polymerization initiator such as a thermal polymerization initiator or a photopolymerization initiator
- a solvent for dissolving or dispersing the monomers such as a surfactant, an ultraviolet absorber, and light.
- Stabilizers, antioxidants, flame retardants, plasticizers, waxes and the like may also be included.
- Thermal polymerization initiators include, for example, 2,2′-azobis(4-methoxy-2,4-dimethylvaleronitrile), 2,2′-azobis(2,4-dimethylvaleronitrile), dimethyl-2,2 '-azobis (2-methylpropionate), 2,2'-azobis (2-methylbutyronitrile), 1,1'-azobis (cyclohexane-1-carbonitrile), 2,2'-azobis [N -(2-propenyl)2-methylpropionamide], 1-[(1-cyano-1-methylethyl)azo]formamide, 2,2′-azobis(N-butyl-2-methylpropionamide), 2, azo compounds such as 2′-azobis(N-cyclohexyl-2-methylpropionamide); peroxides such as t-butyl peroxybenzoate and 2,5-dimethyl-2,5-di(t-butylperoxy)hexane etc.
- the blending amount of the thermal polymerization initiator is preferably 0.01 mol % or more and 5 mol % or less with respect to the monomer.
- photopolymerization initiators include acetophenone compounds such as diethoxyacetophenone; benzoin compounds such as benzoin, benzoin methyl ether, and benzoin isopropyl ether; acylphosphine oxide compounds such as 2,4,6-trimethylbenzoin diphenylphosphine oxide; benzophenone compounds such as benzophenone and hydroxybenzophenone; thioxanthone compounds such as 2-isopropylthioxanthone and 2,4-dimethylthioxanthone; aminobenzophenone compounds such as 4,4'-diethylaminobenzophenone; 10-butyl-2-chloroacridone , 2-ethylanthraquinone, 9,10-phenanthrenequinone, camphorquinone and the like.
- the blending amount of the photopolymerization initiator is preferably 0.01 mol % or more and 5 mol % or less with respect to the monomer.
- a photopolymerization initiator can be used for the monomer in combination with a photopolymerization accelerator, if necessary, in order to solidify the monomer more efficiently.
- photopolymerization accelerators examples include 4-dimethylaminobenzoic acid, ethyl 4-dimethylaminobenzoate, n-butoxyethyl 4-dimethylaminobenzoate, isoamyl 4-dimethylaminobenzoate, and 4-dimethylaminobenzoate 2.
- benzoic acid compounds such as -ethylhexyl; and tertiary amine compounds such as triethanolamine, methyldiethanolamine, triisopropanolamine, 4,4'-dimethylaminobenzophenone, and 4,4'-diethylaminobenzophenone.
- the blending amount of the photopolymerization accelerator is preferably 0.01 mol % or more and 5 mol % or less with respect to the monomer.
- the solidification promoting device 140 applies the solvent contained in the wall material precursor liquid 21 to the liquid marbles 40 moving in one direction inside the cylindrical body 111 . Apply heat to accelerate the removal of However, if the evaporation of the solvent proceeds naturally under the environment in which the capsule manufacturing apparatus 100 is placed, the solidification acceleration device 140 is unnecessary.
- the wall material precursor liquid 21 containing a solvent includes a polymer solution in which a polymer is dissolved in an organic solvent.
- polymers derived from the above-described hydrophobic monomers or hydrophilic monomers preferably poly(meth)acrylate, polystyrene, and polydivinylbenzene can be used.
- Polylactic acid, polyglycolic acid, copolymers of lactic acid and glycolic acid, polycaprolactone, and the like can also be used.
- organic solvents examples include acetone, methanol, ethanol, dimethylsulfoxide, dichloroethane, dichloromethane, hexane, toluene, xylene, ethyl acetate, chloroform, and diethyl ether.
- the polymer solution may contain components other than the polymer and solvent, such as surfactants, ultraviolet absorbers, light stabilizers, antioxidants, flame retardants, plasticizers, and waxes.
- Example A Using the capsule manufacturing apparatus 100 shown in FIG. 2, the mononuclear capsule 10 shown in FIG. 1A was manufactured.
- the inclusion substance 11 consists of MCT (Medium Chain Triglyceride) which is a medium chain fatty acid.
- the wall material 12 is made of agarose gel.
- the amount of the raw material liquid 20 dropped by the dropping device 130 at one time was adjusted to 8 ⁇ L or more and 10 ⁇ L or less.
- Dropper 130 drops a volume of droplets of 0.5 mL per minute.
- the wall material precursor liquid 21 occupies 85% by volume or more and 95% by volume or less of the droplets of the raw material liquid 20, and the inclusion substance 11 occupies the remainder.
- the solid fine particles 30 those made of fluorine resin and having a diameter of about 6 ⁇ 2 ⁇ m are used.
- the fluororesin solid fine particles 30 are sprinkled on the droplets of the raw material liquid 20, and the liquid marbles 40 are formed. It is formed.
- each of the capsules 10 ejected from the cylindrical body 111 was subjected to a drying process to dissipate the moisture contained in the gel-like wall material 12.
- Example A1 where the peripheral velocity of the inner surface of the cylindrical body 111 is 0.08 m/s;
- Example A2 where the peripheral velocity of the inner surface of the cylindrical body 111 is 0.13 m/s;
- Example A3 when the peripheral speed is 0.19 m/s,
- Example A4 when the peripheral speed of the inner surface of the cylindrical body 111 is 0.24 m/s, and the peripheral speed of the inner surface of the cylindrical body 111 is 0.32 m /s, and the case where the peripheral velocity of the inner surface of the cylindrical body 111 is 0.42 m/s is taken as Example A6.
- the sphericity which indicates the closeness of the shape to a true sphere
- the wall thickness uniformity which indicates the uniformity of the thickness of the wall material 12
- the success rate and the inclusion substance content rate which is the content rate of the inclusion substance 11, were measured.
- the definitions of these evaluation indices will be specifically described below.
- the definition of sphericity will be explained with reference to FIG. 7A.
- the longest diameter a and the shortest diameter b of the spherical capsule 10 are measured in the micrograph of the capsule 10 after the drying treatment.
- the sphericity [%] is defined as b/a ⁇ 100.
- the definition of the wall thickness uniformity will be explained with reference to FIG. 7B.
- the thickness d of the wall material 12 where the wall material 12 is the thickest the thickness c of the position including the line segment representing the thickness d, and the thickness of the portion where the wall material 12 is the thinnest
- the thickness f of the wall material 12 and the radius e of the position including the line segment representing the thickness f are measured.
- Wall thickness uniformity [%] is defined by (f/e)/(d/c) ⁇ 100.
- the success rate [%] is defined as (total number of recognized capsules 10)/(total number of droplets of raw material liquid 20 dropped by dropping device 130) x 100.
- the success rate was obtained at the stage before the drying treatment and at the stage after the drying treatment, respectively. This is because the wall material 12 may be damaged by the above-described drying process, and if the wall material 12 is damaged, there is a concern that the encapsulated substance 11 may leak. It's because you can't say it.
- FIG. 8 shows the dependence of the above-described sphericity, wall thickness uniformity, and success rate on the circumferential velocity of the inner surface of the cylindrical body 111 .
- the vertical axis in FIG. 8 indicates the sphericity [%], the wall thickness uniformity [%], and the success rate [%], and the horizontal axis indicates the peripheral velocity [m/s] of the inner surface of the cylindrical body 111 .
- the peripheral velocity of the inner surface of the cylindrical body 111 is 0.08 m/s or more and 0.24 m/s or less, the sphericity [%], the wall thickness uniformity [%], and The success rate [%] becomes relatively high. From this, when the amount of the raw material liquid 20 dropped by the dropping device 130 at one time is 15 ⁇ L or less, the peripheral velocity of the inner surface of the cylindrical body 111 is 0.08 m/s or more and 0.24 m/s. It can be said that the following is preferable.
- the circumferential velocity of the inner surface of the cylindrical body 111 is more preferably 0.08 m/s or more and 0.19 m/s or less, and most preferably 0.13 m/s.
- the sphericity was 98 ⁇ 2 [%]
- the wall thickness uniformity was 88 ⁇ 11 [%]
- the success rate before drying was 100 [%]
- the success rate was 100 [%] after drying. was 100[%].
- the inclusion substance content rate [%] defined by (mass [g] of the inclusion substance 11)/(mass [g] of the capsule 10 before drying) ⁇ 100 was 77 [%].
- Example B Capsules 10 were manufactured under the same conditions as in Example A, except that edible solid particles 30, specifically soybean wax powder containing linoleic acid as a main component, were used.
- the diameter of the soybean wax powder used as the solid fine particles 30 is 64 ⁇ 30 ⁇ m. Since the solid fine particles 30 are edible, even when the capsule 10 is edible, the solid fine particle removing step S5 shown in FIG. 4 can be omitted.
- the peripheral velocity of the inner surface of the cylindrical body 111 was set to 0.13 m/s as in Example A2.
- FIG. 1 A micrograph of the capsule 10 according to Example B is shown in FIG.
- the sphericity was 98 ⁇ 2 [%]
- the wall thickness uniformity was 91 ⁇ 16 [%]
- the success rate before drying was 100 [%]
- the success rate after drying was The rate was 100[%]
- the inclusion substance content rate [%] was 71[%].
- Example C Using the capsule manufacturing apparatus 100 shown in FIG. 2, the mononuclear capsule 10 shown in FIG. 1A was manufactured.
- the inclusion substance 11 according to the present embodiment is made of tetradecane, which is a heat storage material.
- a heat storage material is a material that can store thermal energy and release it when required.
- the wall material 12 according to the present embodiment is made of gelatin.
- As the wall material precursor liquid 21 an aqueous gelatin solution having a concentration of 20% by mass was used.
- the content of tetradecane in the obtained capsules 10 was 91[%] based on the volume after drying.
- the sphericity is 98 ⁇ 1 [%]
- the wall thickness uniformity is 61 ⁇ 8 [%]
- the success rate before and after drying is 100 [%].
- the capsule 10 By encapsulating the heat storage material as the encapsulating substance 11 of the capsule 10, the specific surface area of the heat storage material can be increased compared to using the same heat storage material in bulk. Therefore, heat can be stored and released more quickly. Therefore, the capsule 10 according to this embodiment contributes to energy saving.
- the capsules 10 enclosing the heat storage material could be efficiently obtained one after another.
- the content of tetradecane in the capsule 10 was able to be increased to 91[%].
- the solid particles 30 are arranged on the inner surface of the cylindrical body 111, but the arrangement of the solid particles 30 may be omitted. The details are described below.
- droplets of the raw material liquid 20 directly contact the inner surface of the guide groove 112 inside the cylindrical body 111 . That is, in this embodiment, the powder placement step S1 shown in FIG. 4 is omitted.
- the pitch P of the guide groove 112 is preferably 1.2 times or more, more preferably 1.5 times or more, the average diameter of the droplets. It is more preferable that there is one, and it is more preferable that it is two times or more.
- the average diameter of the droplet is about 3.8 mm.
- the pitch P of the guide grooves 112 is preferably 4.5 mm or more, more preferably 5.7 mm or more, and even more preferably 7.6 mm or more.
- the droplets of the raw material liquid 20 maintain a substantially spherical shape on the inner surface of the guide groove 112 due to their own surface tension.
- the inner surface of the cylindrical body 111 including the inner surface of the guide groove 112 has liquid repellency with respect to the raw material liquid 20 .
- the inner surface of the cylindrical body 111 including the inner surface of the guide groove 112 exhibits a contact angle of 100° or more, preferably 150° or more with respect to the raw material liquid 20, the inner surface of the cylindrical body 111 including the inner surface of the guide groove 112 is exposed to the raw material. It can be said that it has liquid repellency with respect to the liquid 20 .
- the cylindrical body 111 itself, or the surface layer of the inner surface of the cylindrical body 111 including the surface layer of the guide groove 112 may be made of the material exemplified as the material of the solid fine particles 30 described above. . This makes it possible to impart liquid repellency to the cylindrical body 111 .
- FIG. 2 illustrates a cylindrical body 111 as an example of a cylindrical body surrounding the imaginary center line VL.
- the cylindrical body 111 has a straight shape in which the distance between the inner surface and the imaginary center line VL is constant in the length direction of the imaginary center line VL, that is, the generatrix is parallel to the imaginary center line VL.
- the cylindrical body does not necessarily have to have a straight shape.
- the concept of a “cylinder” surrounding the imaginary center line VL includes a shape having a portion where the distance between the inner surface and the imaginary center line VL changes in the length direction of the imaginary center line VL.
- a tapered shape inclined with respect to the virtual center line VL is also included.
- the guide groove 112 is illustrated in FIG. 2, the guide groove in which the liquid droplets roll may be formed in a circular shape.
- the cylindrical body an embodiment using a tapered cylindrical body having a circumferential guide groove formed on the inner surface thereof will be described.
- the cylindrical body 114 is configured so that the capsule 10 is ejected from the end where the dripping device 130 is arranged with respect to the length direction parallel to the virtual center line VL. It has a widening shape with an inner diameter that gradually increases toward the end of the tube.
- the guide groove 115 according to the present embodiment is composed of a plurality of circumferential grooves 115a arranged in the longitudinal direction parallel to the imaginary center line VL.
- each raw material liquid 20 roll in the guide groove 115 in the form of liquid marbles 40 . Since the generatrix of the cylindrical body 114 inclines downward as it moves away from the dropping device 130, each rolling liquid marble 40 swings in the circumferential direction of the cylindrical body 115 and moves along the generatrix under its own weight. down. Further, in the course of the movement, solidification of the wall material precursor liquid 21 in each liquid marble 40 progresses. Other configurations and actions are the same as those of the first embodiment.
- FIG. 3 illustrates a droplet of the raw material liquid 20 in which the mononuclear inclusion substance 11 is covered with the wall material precursor liquid 21 .
- This droplet is suitable for manufacturing the capsule 10 shown in FIG. 1A.
- the dripping nozzle portion for dripping the raw material liquid 20 in the dripping device 130 may be composed of multiple pipes of triple or more.
- droplets of the raw material liquid 20 in which the multi-nuclear inclusion substance 11 is covered with the wall material precursor liquid 21 can be formed.
- Such droplets are suitable for manufacturing the capsule 10 shown in FIG. 1B. Since the encapsulation of the raw material liquid 20 progresses while the droplets of the raw material liquid 20 roll, in the case of producing the multinucleated capsule 10 shown in FIG. unlikely to occur.
- the structure shown in FIG. 1C can be obtained.
- Capsules 10 can also be manufactured. Since the encapsulation of the raw material liquid 20 progresses while the droplets of the raw material liquid 20 roll, the internal texture is homogenized when the capsule 10 shown in FIG. 1C is produced.
- FIG. 3 illustrates a configuration in which the inclusion substance 11 and the wall material precursor liquid 21 are dropped together, but the inclusion substance 11 and the wall material precursor liquid 21 are dropped separately. good too.
- the separately dropped inclusion substance 11 and wall material precursor liquid 21 may be encapsulated in the process of rolling in the guide groove 112 .
- the concept of “encapsulation” includes covering the inclusion substance 11 with the wall material precursor liquid 21 and solidifying the wall material precursor liquid 21 covering the inclusion substance 11 . Note that when the inclusion substance 11 and the wall material precursor liquid 21 are dropped separately, the powder disposing step S1 described above may be omitted.
- FIGS. 2 and 11 illustrate the rotating barrel 110 in which the imaginary center line VL is horizontally arranged.
- the virtual center line VL may have a slight inclination angle ⁇ with respect to the horizontal plane, specifically an inclination angle ⁇ of 60° or less, preferably 30° or less.
- the term "sideways posture" includes the case where the imaginary center line VL has such a slight inclination angle ⁇ .
- the cylindrical body 111 is moved from the end on which droplets are dropped toward the end on which the capsule 10 is discharged. can also be tilted downwards.
- FIG. 12 shows a cylindrical body 111 in which the imaginary center line VL is given an inclination angle ⁇ .
- Each liquid marble 40 rolling on the inner surface of the cylindrical body 111 swings in the circumferential direction of the cylindrical body 111 and moves downward along the generatrix parallel to the imaginary center line VL by its own weight.
- the guide groove 115 may be configured by a plurality of circumferential grooves 115a arranged in the longitudinal direction parallel to the imaginary center line VL.
- FIGS. 11 and 12 exemplify a configuration in which a circumferential guide groove 115 is formed in cylindrical bodies 114 and 111 whose generatrix is inclined with respect to the horizontal plane.
- a spiral guide groove 112 may be formed for the cylinders 114 and 111 whose generatrix is inclined with respect to the horizontal plane.
- FIG. 2 illustrates a configuration in which the spiral guide groove 112 is formed in the cylindrical body 111 whose generatrix is horizontally arranged.
- a similar effect can be obtained by forming a circular guide groove 115 .
- cylindrical bodies 111 and 114 having circular cross sections perpendicular to the virtual center line VL are illustrated as examples of the cylindrical bodies surrounding the virtual center line VL.
- the term “circular” is a concept that includes not only perfect circles but also ellipses.
- the cross section of the "cylinder" surrounding the virtual center line VL may not necessarily be circular.
- the encapsulated substance 11 can be selected according to the application of the capsule 10. Either an oil-soluble substance or a water-soluble substance can be used as the inclusion substance 11 .
- the inclusion substance 11 may be used alone or in combination of two or more.
- oil-soluble inclusion substance 11 examples include oil-soluble agricultural chemicals, adhesives, inks, heat storage materials, pharmaceuticals, and the like.
- a cooling medium such as tetradecane, a fat-soluble vitamin such as ⁇ -tocopherol, and an anticancer agent such as doxorubicin can be used as the oil-soluble inclusion substance 11 .
- water-soluble inclusion substances 11 examples include water-soluble pesticides, adhesives, inks, heat storage materials, pharmaceuticals, and the like. Specifically, a solvent such as water and a protein such as bovine serum albumin can be used as the water-soluble inclusion substance 11 .
- the inclusion substance 11 may be volatile or non-volatile.
- the inclusion substance 11 can be used by dissolving it in a solvent.
- the solvent can be appropriately selected according to the inclusion substance 11 to be used.
- organic solvents such as acetone, methanol, ethanol, dimethylsulfoxide, dichloroethane, dichloromethane, hexane, xylene, ethyl acetate, chloroform, and diethyl ether can be used.
- a solvent such as water can be used.
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Abstract
Description
仮想中心線を取り囲む筒状に形成され、前記仮想中心線まわりに螺旋状又は周回状の案内溝が内面に形成されている筒体、を用いるカプセル製造方法であって、
前記筒体の前記内面に、内包物質と、前記内包物質を覆う壁材の前駆体である壁材前駆体液とを滴下する滴下工程と、
前記滴下工程で滴下された液滴が、前記仮想中心線まわりに回転している前記筒体の前記案内溝を転動することにより、前記内包物質及び前記壁材前駆体液のカプセル化が進行するカプセル化工程と、
前記カプセル化が進行して得られるカプセルが、前記筒体から排出されるカプセル排出工程と、
を有する。
をさらに有し、
前記カプセル化工程では、回転している前記筒体の前記案内溝を前記液滴が前記固体微粒子と一緒に転動することにより、前記固体微粒子が前記液滴の表面にまぶし付けられたリキッドマーブルが形成され、前記液滴が前記リキッドマーブルの形態で前記案内溝を転動してもよい。
前記滴下工程及び前記カプセル化工程における前記筒体の前記内面の周速度が、0.08m/s以上、0.24m/s以下であってもよい。
前記カプセル化が、前記壁材前駆体液の前記ゲル化によって進行してもよい。
前記カプセル化が、前記モノマーの重合によって進行してもよい。
前記カプセル化が、前記溶媒の除去によって進行してもよい。
仮想中心線を取り囲む筒状に形成され、前記仮想中心線まわりに螺旋状又は周回状の案内溝が内面に形成されている筒体と、
前記仮想中心線まわりに前記筒体を回転させる回転装置と、
前記筒体の前記内面に、内包物質と、前記内包物質を覆う壁材の前駆体である壁材前駆体液とを滴下する滴下装置と、
を備え、
前記滴下装置によって滴下された液滴が、前記回転装置によって回転されている前記筒体の前記案内溝を転動することにより、前記内包物質及び前記壁材前駆体液のカプセル化が進行する。
をさらに備えてもよい。
図2に示すように、本実施形態に係るカプセル製造装置100は、回転筒110と、回転筒110を回転させる回転装置120と、回転装置120によって回転されている回転筒110に、カプセル10の前駆体である原料液20を低下する滴下装置130とを備える。
図2に示すカプセル製造装置100を用いて、図1Aに示す単核状のカプセル10を製造した。内包物質11は、中鎖脂肪酸であるMCT(Medium Chain Triglyceride)よりなる。壁材12は、アガロースゲルよりなる。壁材前駆体液21には、予め室温より高い温度に加温した濃度3質量%のアガロース水溶液を用いた。アガロース水溶液の密度は、MCTの密度よりも大きい。
固体微粒子30として、可食性のもの、具体的には、リノール酸を主成分とする大豆ワックス粉末を用いたこと以外は、実施例Aと同じ条件で、カプセル10を製造した。固体微粒子30として用いた大豆ワックス粉末の直径は、64±30μmである。固体微粒子30が可食性を有するため、カプセル10を食用とする場合でも、図4に示した固体微粒子除去工程S5を省略できる。なお、円筒体111の内面の周速度は、実施例A2の場合と同じく、0.13m/sとした。
図2に示すカプセル製造装置100を用いて、図1Aに示す単核状のカプセル10を製造した。本実施例に係る内包物質11は、蓄熱材であるテトラデカンよりなる。ここで蓄熱材とは、熱エネルギーを貯蔵し、必要な時にそれを放出できる物質のことである。また、本実施例に係る壁材12は、ゼラチンよりなる。壁材前駆体液21には、濃度20質量%のゼラチン水溶液を用いた。
図2に示したように、上記第1実施形態では、円筒体111の内面に固体微粒子30を配置したが、固体微粒子30の配置は省略してもよい。以下、その具体的を述べる。
図2には、仮想中心線VLを取り囲む筒体の一例として、円筒体111を例示した。円筒体111は、内面と仮想中心線VLとの距離が仮想中心線VLの長さ方向に一定な、即ち、母線が仮想中心線VLと並行な、ストレート形状を有する。しかし、筒体は必ずしもストレート形状を有していなくてもよい。本明細書において、仮想中心線VLを取り囲む“筒体”の概念には、内面と仮想中心線VLとの距離が仮想中心線VLの長さ方向に変化する部分を有する形状、例えば、母線が仮想中心線VLに対して傾斜したテーパ形状を有するものも含まれる。
11…内包物質、
12…壁材、
13…複合マトリクス、
20…原料液、
21…壁材前駆体液、
30…固体微粒子、
40…リキッドマーブル、
100…カプセル製造装置、
110…回転筒、
111…円筒体(筒体)、
112…案内溝、
113…回転軸、
114…円筒体(筒体)、
115…案内溝、
115a…周回溝、
120…回転装置、
130…滴下装置、
131…内管、
132…外管、
140…固化促進装置、
VL…仮想中心線。
Claims (10)
- 仮想中心線を取り囲む筒状に形成され、前記仮想中心線まわりに螺旋状又は周回状の案内溝が内面に形成されている筒体、を用いるカプセル製造方法であって、
前記筒体の前記内面に、内包物質と、前記内包物質を覆う壁材の前駆体である壁材前駆体液とを滴下する滴下工程と、
前記滴下工程で滴下された液滴が、前記仮想中心線まわりに回転している前記筒体の前記案内溝を転動することにより、前記内包物質及び前記壁材前駆体液のカプセル化が進行するカプセル化工程と、
前記カプセル化が進行して得られるカプセルが、前記筒体から排出されるカプセル排出工程と、
を有する、カプセル製造方法。 - 前記滴下工程の前に、前記筒体の前記案内溝に、前記液滴よりも小さい固体微粒子の粉末を予め配置する粉末配置工程、
をさらに有し、
前記カプセル化工程では、回転している前記筒体の前記案内溝を前記液滴が前記固体微粒子と一緒に転動することにより、前記固体微粒子が前記液滴の表面にまぶし付けられたリキッドマーブルが形成され、前記液滴が前記リキッドマーブルの形態で前記案内溝を転動する、
請求項1に記載のカプセル製造方法。 - 前記筒体の前記案内溝の表面が、前記液滴に対して撥液性を有する、
請求項1に記載のカプセル製造方法。 - 前記滴下工程で1回に滴下する前記液滴の量が、15μL以下であり、
前記滴下工程及び前記カプセル化工程における前記筒体の前記内面の周速度が、0.08m/s以上、0.24m/s以下である、
請求項1又は2に記載のカプセル製造方法。 - 前記壁材前駆体液が、ゲル化する性質を有し、
前記カプセル化が、前記壁材前駆体液の前記ゲル化によって進行する、
請求項1から4のいずれか1項に記載のカプセル製造方法。 - 前記壁材前駆体液が、モノマーを含み、
前記カプセル化が、前記モノマーの重合によって進行する、
請求項1から4のいずれか1項に記載のカプセル製造方法。 - 前記壁材前駆体液が、溶媒を含み、
前記カプセル化が、前記溶媒の除去によって進行する、
請求項1から4のいずれか1項に記載のカプセル製造方法。 - 仮想中心線を取り囲む筒状に形成され、前記仮想中心線まわりに螺旋状又は周回状の案内溝が内面に形成されている筒体と、
前記仮想中心線まわりに前記筒体を回転させる回転装置と、
前記筒体の前記内面に、内包物質と、前記内包物質を覆う壁材の前駆体である壁材前駆体液とを滴下する滴下装置と、
を備え、
前記滴下装置によって滴下された液滴が、前記回転装置によって回転されている前記筒体の前記案内溝を転動することにより、前記内包物質及び前記壁材前駆体液のカプセル化が進行する、
カプセル製造装置。 - 前記滴下装置が1回に滴下する前記液滴の量が、15μL以下である、
請求項8に記載のカプセル製造装置。 - 前記筒体の前記案内溝を転動している前記液滴における前記壁材前駆体液の固化を促進する固化促進装置、
をさらに備える、請求項8又は9に記載のカプセル製造装置。
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