JPH05179006A - Production of uniform droplet group - Google Patents
Production of uniform droplet groupInfo
- Publication number
- JPH05179006A JPH05179006A JP35884891A JP35884891A JPH05179006A JP H05179006 A JPH05179006 A JP H05179006A JP 35884891 A JP35884891 A JP 35884891A JP 35884891 A JP35884891 A JP 35884891A JP H05179006 A JPH05179006 A JP H05179006A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- droplets
- gas
- raw material
- liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Landscapes
- Special Spraying Apparatus (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Glanulating (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は粉末、顆粒或はマイクロ
カプセル等を製造する際に利用される、均一な液滴群の
製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing uniform droplet groups, which is used when producing powder, granules, microcapsules and the like.
【０００２】[0002]
【従来の技術】粒子や顆粒を製造する際には、原料を微
細な液滴とした後、それを硬化液と接触させる等により
固化させて製造することが多い。この場合均一な粒子を
得るには、その前提として均一な粒子径を有する液滴群
の生成が不可欠である。そこで従来より均一な大きさの
液滴群を発生させることを目的として、ノズルから流出
する平滑な液体噴流に規則的な振動を与えることによ
り、上記噴流を分断して均一な大きさの液滴を発生させ
る方法が検討されている（例えば、特公昭６４−２４１
４号公報、特公昭５６−３３１３４号公報、特公平２−
１１２９８号公報等）。これらの方法の原理は Rayleig
h,I.(proc.Lond.Math.Soc.,10 4,1877)やWever,C.(Ange
w.Math.Mech.,11 136,1931)等の液体柱の不安定性に関
する研究により知られている。これは液体柱に生じた微
小な初期乱れが経時的に成長し、乱れの幅が液体柱の直
径を超えた時に分断され、これにより乱れの成長に応じ
た液滴が生成されるというものであり、Rayleigh,I. 等
は液体柱状噴流に規則的な振動を加えることにより、そ
の噴流の表面に微小な乱れを発生させている。2. Description of the Related Art In the production of particles or granules, a raw material is often made into fine droplets and then solidified by contacting with a hardening liquid. In this case, in order to obtain uniform particles, it is essential to generate droplet groups having a uniform particle size. Therefore, for the purpose of generating a droplet group having a more uniform size than in the past, by regularly vibrating a smooth liquid jet flowing out of the nozzle, the jet stream is divided to form a uniform droplet size. A method of generating the above is being studied (for example, Japanese Patent Publication No. 64-241).
4, Japanese Patent Publication No. 56-33134, Japanese Patent Publication No. 2-
No. 11298, etc.). The principle of these methods is Rayleig
h, I. (proc.Lond.Math.Soc., 10 4,1877) and Wever, C. (Ange
w.Math.Mech., 11 136, 1931) and others, which are known for their research on the instability of liquid columns. This is because the minute initial turbulence generated in the liquid column grows over time and is divided when the width of the turbulence exceeds the diameter of the liquid column, thereby generating droplets according to the growth of turbulence. Yes, Rayleigh, I. et al. Generate minute turbulence on the surface of a liquid columnar jet by applying regular vibration to the jet.
【０００３】[0003]
【発明が解決しようとする課題】上記技術を用いて液滴
群を製造するにあたり、大量生産を目的として多数のノ
ズル孔を有するノズル板を使用した場合には、ノズル孔
付近での液の滲み等により生じた雫が成長して、隣接す
るノズルと干渉を起こし斜行現象や滴下現象を生じ、均
一な液滴群の生成が妨げられて製品の不良率が高まって
しまうという問題があった。このような現象は、吐出開
始時や一旦吐出を停止して再開する場合に特に甚だし
く、また液体の流動性がビンガム流動性を示す場合にも
しばしば観察される。本発明は以上のような事情に鑑み
てなされたものであって、均一な液滴群を効率よく製造
できる方法を提供しようとするものである。When producing a droplet group using the above technique, when a nozzle plate having a large number of nozzle holes is used for the purpose of mass production, liquid bleeding around the nozzle holes is caused. However, there is a problem in that the drop generated by the above causes interference with the adjacent nozzles and causes a skewing phenomenon and a dropping phenomenon, which hinders the generation of uniform droplet groups and increases the defective rate of the product. . Such a phenomenon is particularly serious when the discharge is started or when the discharge is once stopped and then restarted, and is often observed when the fluidity of the liquid exhibits Bingham fluidity. The present invention has been made in view of the above circumstances, and an object thereof is to provide a method capable of efficiently producing uniform droplet groups.
【０００４】[0004]
【課題を解決するための手段】本発明の均一な液滴群の
製造方法は、原料液を多数のノズル孔から、縦方向振動
条件下に液滴を形成させつつ垂直方向に落下させて液滴
群を製造するにあたり、液滴の落下開始時若しくはノズ
ル吐出面に雫が形成された時に、ノズル吐出面に気体を
吹きつけて雫を吹き飛ばすことに要旨がある。また雫を
吹き飛ばす際に、有機溶媒または界面活性剤を含む溶液
を、気体と共にノズル吐出面に吹きつけることにより、
より効率よく雫を取り除くことができる。According to the method for producing a uniform droplet group of the present invention, a raw material liquid is dropped from a large number of nozzle holes in a vertical direction while forming droplets under conditions of longitudinal vibration. In producing the droplet group, it is essential to blow gas onto the nozzle ejection surface to blow off the droplet when the droplet starts to drop or when the droplet is formed on the nozzle ejection surface. Also, when the droplets are blown off, a solution containing an organic solvent or a surfactant is blown together with the gas onto the nozzle ejection surface,
Drops can be removed more efficiently.
【０００５】[0005]
【作用】液滴群を製造するにあたり、液体の吐出を開始
する際や一旦吐出を停止して再開する際、或は製造中に
おいて、噴流が斜行することの大きな原因は、ノズル吐
出面に形成された雫による干渉である。雫はその表面張
力と自重との釣り合いによってノズル吐出面に付着して
いるが、雫が大きくなると噴流の噴出勢いでは吐出面か
らの脱離ができなくなり、逆に雫の成長を促して隣接す
るノズルにまでその影響を及ぼしてしまう。従ってこの
雫を、圧縮空気等を吐出面に吹きつけて強制的に吹き飛
ばすことによって、素早く正常な噴流を形成することが
できる。また圧縮気体と共に、界面活性剤や有機溶媒を
吹きつけることによって、液体と吐出面との界面張力を
小さくして雫を容易に消滅させて素早く正常な噴流液柱
を形成することができる。In the production of the droplet group, the main cause of the oblique jet flow at the nozzle ejection surface is when the ejection of the liquid is started, when the ejection is once stopped and then restarted, or during the production. This is interference due to the formed drops. The drop adheres to the nozzle discharge surface due to the balance between its surface tension and its own weight, but when the drop becomes large, it cannot be separated from the discharge surface by the jet force of the jet flow, and conversely promotes the growth of the drop and adjoins it. It also affects the nozzle. Therefore, a normal jet flow can be quickly formed by blowing compressed air or the like onto the discharge surface to forcibly blow it off. Further, by spraying a surfactant or an organic solvent together with the compressed gas, the interfacial tension between the liquid and the ejection surface can be reduced, the drop can be easily eliminated, and a normal jet liquid column can be quickly formed.
【０００６】上記吐出面に吹きつける気体の種類は特に
限定されるものではなく、圧縮空気や圧縮窒素等を任意
に選択することができる。また前記気体と共に吹きつけ
られる界面活界剤や有機溶媒の種類も特に限定されるも
のではなく、原料液と親和性があり、界面張力を低減さ
れるものであれば良い。例えば界面活性剤としては硫酸
ドデシルナトリウムやポリオキシエチレンソルビタンモ
ノオレート等が挙げられ、有機溶媒としてはエタノー
ル、アセトン等を挙げることができる。The type of gas blown onto the discharge surface is not particularly limited, and compressed air, compressed nitrogen or the like can be arbitrarily selected. Further, the kinds of the surface active agent and the organic solvent sprayed together with the gas are not particularly limited as long as they have an affinity with the raw material liquid and can reduce the interfacial tension. Examples of the surfactant include sodium dodecyl sulfate and polyoxyethylene sorbitan monooleate, and examples of the organic solvent include ethanol and acetone.
【０００７】本願発明を実施するにあたっては、原料液
を垂直方向に噴出する多数のノズル孔を有するノズル板
と、該ノズル板に向かって気体を吹きつける装置が設け
られた装置を用いて実施することができる。図１に一例
を示す。供給タンク８内の原料液９は圧力調節器10によ
り一定圧力に制御された圧縮気体によってノズルホルダ
ー２へ圧送される。ノズルホルダー２には多数個のノズ
ル孔を有するノズル板１が固定され、ノズルホルダー２
に連結された加振装置３によって一定周期で加振され
る。この際にノズルの吐出面に形成された雫を、スプレ
ーノズル４から吐出される気体により吹き飛ばす。これ
により斜行現象等が起こらず、ノズル板１から噴出した
液柱が振動数に応じて均一な粒子径を有する液滴11に分
裂する。流動する硬化用液６に捕捉された液滴11は直ち
に硬化し、粒子12は回収され、硬化用液６は循環ポンプ
７により循環して利用される。In carrying out the present invention, a nozzle plate having a large number of nozzle holes for vertically ejecting the raw material liquid and a device provided with a device for blowing gas toward the nozzle plate are used. be able to. An example is shown in FIG. The raw material liquid 9 in the supply tank 8 is pressure-fed to the nozzle holder 2 by a compressed gas whose pressure is controlled to a constant pressure by a pressure regulator 10. The nozzle plate 1 having a large number of nozzle holes is fixed to the nozzle holder 2, and the nozzle holder 2
The vibrating device 3 connected to the vibrating device vibrates in a constant cycle. At this time, the droplets formed on the discharge surface of the nozzle are blown off by the gas discharged from the spray nozzle 4. As a result, the skew phenomenon does not occur, and the liquid column ejected from the nozzle plate 1 is divided into droplets 11 having a uniform particle diameter according to the frequency. The droplets 11 trapped in the flowing hardening liquid 6 are immediately hardened, the particles 12 are collected, and the hardening liquid 6 is circulated and used by the circulation pump 7.
【０００８】以下実施例によって本発明を更に詳述する
が、下記実施例は本発明を制限するものではなく、前・
後記の趣旨を逸脱しない範囲で変更実施することは全て
本発明の技術範囲に包含される。The present invention will be described in more detail with reference to the following examples, but the following examples do not limit the present invention.
All modifications and implementations are included in the technical scope of the present invention without departing from the spirit of the description below.
【０００９】[0009]
実施例１ 原料液として、アルミナ粉末１０wt％及びポリビニルア
ルコール１wt％を含む水溶液を用い、ノズル孔径100 μ
m のノズルを 150本有するノズル板からノズルを6000Hz
の振動数で加振しつつ、噴出流量２cm3/min で鉛直下向
きに吐出させた。吐出開始時に数本のノズル出口に雫が
形成され、斜行現象が見られたため、界面活性剤（ポリ
オキシエチレンソルビタンモノオレート）を0.5vol％含
有する水溶液をエアーゾルスプレーで数秒間吹きつけ
た。その結果すべてのノズル孔から安定した噴流液柱が
形成され、粒子径２１０μｍの均一な液滴群が安定して
生成した。Example 1 An aqueous solution containing 10% by weight of alumina powder and 1% by weight of polyvinyl alcohol was used as a raw material liquid, and the nozzle hole diameter was 100 μm.
6000Hz nozzle from nozzle plate with 150 m nozzles
While oscillating at the frequency of, the jet flow rate was 2 cm 3 / min and the liquid was discharged vertically downward. Since droplets were formed at the outlet of several nozzles at the start of discharge and a skewing phenomenon was observed, an aqueous solution containing 0.5 vol% of a surfactant (polyoxyethylene sorbitan monooleate) was sprayed with an aerosol spray for several seconds. . As a result, stable jet liquid columns were formed from all the nozzle holes, and uniform droplet groups having a particle diameter of 210 μm were stably generated.
【００１０】実施例２ 原料液として、ポリビニルアルコール５wt％を含む水溶
液を用い、ノズル孔径150μm のノズルを 100本有する
ノズル板からノズルを4500Hzの振動数で加振しつつ、噴
出流量3.2cm3/minで鉛直下向きに吐出させた。吐出開始
時に数本のノズル出口に雫が形成され、斜行現象が見ら
れたため、圧縮空気を細いノズルからノズル吐出面に数
秒間吹きつけた。その結果すべてのノズル孔から安定し
た噴流液体柱が形成され、粒子径２８０μｍの均一な液
滴群が安定して生成した。Example 2 An aqueous solution containing 5 wt% of polyvinyl alcohol was used as a raw material liquid, and a nozzle plate having 100 nozzles having a nozzle hole diameter of 150 μm was vibrated from the nozzle plate at a frequency of 4500 Hz, and the ejection flow rate was 3.2 cm 3 / Discharged vertically downward at min. Since droplets were formed at the outlets of several nozzles at the start of discharge and a skewing phenomenon was observed, compressed air was blown onto the nozzle discharge surface from a thin nozzle for several seconds. As a result, stable jet liquid columns were formed from all the nozzle holes, and uniform droplet groups with a particle diameter of 280 μm were stably generated.
【００１１】[0011]
【発明の効果】本発明は以上のように構成されており、
ノズル孔からの噴出初期或は操業中に形成される雫によ
る不都合を簡単に排除し、均一な液滴群を多孔ノズルよ
り効率よく製造できる方法を提供できるようになった。The present invention is configured as described above,
It has become possible to easily eliminate the inconvenience caused by drops formed at the initial stage of jetting from a nozzle hole or during operation, and to provide a method capable of producing uniform droplet groups more efficiently than a multi-hole nozzle.
【図１】本発明に用いられる装置の一例を示す概略説明
図である。FIG. 1 is a schematic explanatory view showing an example of an apparatus used in the present invention.
１ ノズル板 ２ ノズルホルダー ３ 加振装置 ４ スプレーノズル ５ ボンベ ６ 硬化用液 ７ 循環ポンプ ８ 供給タンク ９ 原料液 10 圧力調整器 11 液滴 12 粒子 1 Nozzle Plate 2 Nozzle Holder 3 Vibrating Device 4 Spray Nozzle 5 Cylinder 6 Curing Liquid 7 Circulating Pump 8 Supply Tank 9 Raw Material Liquid 10 Pressure Regulator 11 Droplet 12 Particles
Claims (2)
動条件下に液滴を形成させつつ垂直方向に落下させて液
滴群を製造するにあたり、液滴の落下開始時若しくはノ
ズル吐出面に雫が形成された時に、ノズル吐出面に気体
を吹きつけて雫を吹き飛ばすことを特徴とする均一な液
滴群の製造方法。1. When manufacturing a droplet group by dropping a raw material liquid from a large number of nozzle holes in a vertical direction while forming droplets under vertical vibration conditions, at the start of dropping of droplets or a nozzle ejection surface. A method for producing a uniform droplet group, characterized in that, when a drop is formed on the nozzle, a gas is blown onto the nozzle discharge surface to blow the drop off.
面活性剤を含む溶液を、気体と共にノズル吐出面に吹き
つける請求項１記載の均一な液滴群の製造方法。2. The method for producing uniform droplet groups according to claim 1, wherein a solution containing an organic solvent or a surfactant is blown together with a gas onto the nozzle ejection surface when the droplets are blown off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35884891A JPH05179006A (en) | 1991-12-26 | 1991-12-26 | Production of uniform droplet group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35884891A JPH05179006A (en) | 1991-12-26 | 1991-12-26 | Production of uniform droplet group |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05179006A true JPH05179006A (en) | 1993-07-20 |
Family
ID=18461418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35884891A Withdrawn JPH05179006A (en) | 1991-12-26 | 1991-12-26 | Production of uniform droplet group |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05179006A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5628937A (en) * | 1992-12-18 | 1997-05-13 | Imperial Chemical Industries Plc | Production of particulate materials |
| JP2012071220A (en) * | 2010-09-27 | 2012-04-12 | Kao Corp | Manufacturing method for hydrogel particle |
| JP2013063387A (en) * | 2011-09-16 | 2013-04-11 | Ricoh Co Ltd | Fine particle manufacturing apparatus and method, and toner manufacturing apparatus and method |
-
1991
- 1991-12-26 JP JP35884891A patent/JPH05179006A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5628937A (en) * | 1992-12-18 | 1997-05-13 | Imperial Chemical Industries Plc | Production of particulate materials |
| JP2012071220A (en) * | 2010-09-27 | 2012-04-12 | Kao Corp | Manufacturing method for hydrogel particle |
| JP2013063387A (en) * | 2011-09-16 | 2013-04-11 | Ricoh Co Ltd | Fine particle manufacturing apparatus and method, and toner manufacturing apparatus and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990311 |