JP2840642B2 - Resin granulation method and apparatus - Google Patents
Resin granulation method and apparatusInfo
- Publication number
- JP2840642B2 JP2840642B2 JP3194120A JP19412091A JP2840642B2 JP 2840642 B2 JP2840642 B2 JP 2840642B2 JP 3194120 A JP3194120 A JP 3194120A JP 19412091 A JP19412091 A JP 19412091A JP 2840642 B2 JP2840642 B2 JP 2840642B2
- Authority
- JP
- Japan
- Prior art keywords
- disk
- temperature
- resin
- heated
- coil
- 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.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/10—Making granules by moulding the material, i.e. treating it in the molten state
-
- 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
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/12—Making granules characterised by structure or composition
- B29B2009/125—Micropellets, microgranules, microparticles
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Constitution Of High-Frequency Heating (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は噴霧冷却造粒によって樹
脂粉末を製造する方法及びその装置に関するBACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing a resin powder by spray cooling granulation.
【0002】。[0002]
【従来の技術及び課題】樹脂粉末を製造する方法として
は、機械粉砕、化学粉砕、噴霧冷却造粒等が知られてい
るが、噴霧冷却造粒は、溶融樹脂を噴霧し、冷却、固化
させるので、真球状の粒子が得られるのが特徴である。
噴霧方式にはいくつかの種類があるが、ディスクアトマ
イズ方式は、高速回転するディスクに原液を供給し、遠
心力によって噴霧する方法であり、ディスクの回転数を
変化させることによって容易に粒径を制御できるため、
少量多品種生産に適する。2. Description of the Related Art Mechanical pulverization, chemical pulverization, spray cooling granulation and the like are known as methods for producing resin powder. In spray cooling granulation, a molten resin is sprayed, cooled and solidified. Therefore, it is characteristic that true spherical particles are obtained.
There are several types of spraying methods.The disk atomizing method is a method in which a stock solution is supplied to a high-speed rotating disk and sprayed by centrifugal force.The particle size can be easily changed by changing the number of rotations of the disk. Control,
Suitable for small lot multi-product production.
【0003】しかし、溶融樹脂をディスクアトマイズ方
式によって噴霧冷却造粒する場合、ディスクが十分に加
熱されていないと、供給した樹脂がディスク上で冷却さ
れるため、粘度が高くなって粒度の小さな粉末ができに
くくなったり、ディスク上で固まったりする問題があっ
た。However, when a molten resin is spray-cooled and granulated by a disk atomizing method, if the disk is not sufficiently heated, the supplied resin is cooled on the disk, so that the viscosity increases and the powder having a small particle size is formed. However, there was a problem that it became difficult to perform, or the hardening occurred on a disk.
【0004】ディスクを加熱する方法として、樹脂の融
点以下の雰囲気温度を支配する熱風とは別に、樹脂の融
点以上の熱風をディスクに直接吹き付けることが考えら
れる。しかし、この方法について、熱風の温度と量及び
熱風の吹き出し口の形などを検討したが、二つの熱風の
混合を防ぐことが難しく、ディスクの効果的な加熱がで
きなかった。[0004] As a method of heating the disk, it is conceivable to directly blow hot air having a temperature equal to or higher than the melting point of the resin onto the disk, separately from hot air which governs the ambient temperature equal to or lower than the melting point of the resin. However, in this method, the temperature and amount of the hot air and the shape of the outlet of the hot air were examined, but it was difficult to prevent the mixing of the two hot air, and the disk could not be heated effectively.
【0005】そこで、本発明者らは鋭意検討の結果、全
く新しい方法として、誘導加熱によってディスクを直接
発熱させることにより課題を解決できることを見出だ
し、本発明を完成した。The present inventors have made intensive studies and found that the problem can be solved by directly heating the disk by induction heating as a completely new method, and completed the present invention.
【0006】[0006]
【課題を解決するための手段】本発明は溶融樹脂をディ
スクアトマイズ方式によって噴霧冷却造粒するに当っ
て、ディスクを誘導加熱によって加熱することを特徴と
する噴霧冷却造粒方法およびその装置である。すなわ
ち、ディスクの上または下のごく近くにコイルを設置
し、このコイルに高周波発生器を接続することによって
高速回転するディスクを誘導加熱し、そこに溶融樹脂原
液を供給して噴霧冷却造粒を行うものである。誘導加熱
とは、コイルが発生する交番磁界によって、コイル近傍
の鉄などの磁性体に渦電流が発生し、それによって磁性
体が発熱する現象を利用するものである。加熱できる材
質に制限があるものの、被加熱物自身が発熱するためロ
スが少なく応用例は多い。身近な例では電磁調理器があ
る。SUMMARY OF THE INVENTION The present invention relates to a spray cooling granulation method and apparatus for heating a disk by induction heating in spray cooling and granulating a molten resin by a disk atomizing method. . In other words, a coil is installed very close to the top or bottom of the disk, and a high-frequency rotating disk is induction-heated by connecting a high-frequency generator to this coil, and a molten resin stock solution is supplied thereto to perform spray cooling granulation. Is what you do. Induction heating utilizes a phenomenon in which an eddy current is generated in a magnetic body such as iron near the coil by an alternating magnetic field generated by the coil, and the magnetic body generates heat. Although there is a limit to the material that can be heated, the object to be heated itself generates heat, so that the loss is small and there are many applications. A familiar example is an electromagnetic cooker.
【0007】本発明に用いる樹脂は、加熱により流動性
を持つものならば何でも良く、ポリエチレン、ポリプロ
ピレン、ポリスチレン、ポリエステル、ポリアミドなど
が例示できる。The resin used in the present invention may be any resin as long as it has fluidity when heated, and examples thereof include polyethylene, polypropylene, polystyrene, polyester, and polyamide.
【0008】本発明に用いるディスクの材質は、鉄が望
ましいが、磁性体であれば効率の差はあっても何でも発
熱するので利用できる。また、非磁性体の中に鉄を埋め
込んだものや、鉄の表面に塗料を塗ったり、鍍金を施し
たりしたものも当然使用できる。The material of the disk used in the present invention is desirably iron, but any magnetic material can be used because it generates heat regardless of the efficiency. It is also possible to use a material in which iron is embedded in a non-magnetic material, or a material in which the surface of iron is coated with paint or plated.
【0009】ディスクの温度は、雰囲気温度、原液温
度、原液供給量などの条件にもよるが、原料の流動化温
度以上であることが望ましく、原液温度と同じかそれ以
上であれば一層望ましい。特に、原液温度よりもディス
クの温度を高く設定することは、次の点で有利である。
すなわち、径の小さい粉末を製造するには溶融粘度が低
い方がよいが、そのために原液の温度を上げると、樹脂
の熱劣化が起りやすくなる欠点がある。そこで、原液の
温度をあまり上げずに、ディスクの温度を高く設定すれ
ば、ディスク上で短時間に加熱されて粘度が下がるの
で、樹脂の熱劣化がなく細かい粉末を製造できる。ま
た、同じ理由で少し溶融粘度の高い原料でも使用できる
利点も生ずる。The temperature of the disk depends on the conditions such as ambient temperature, stock solution temperature, stock solution supply amount, etc., but is preferably higher than the fluidization temperature of the raw material, and more preferably equal to or higher than the stock solution temperature. In particular, setting the disk temperature higher than the stock solution temperature is advantageous in the following respects.
That is, in order to produce a powder having a small diameter, it is better that the melt viscosity is low. However, if the temperature of the undiluted solution is increased, there is a disadvantage that thermal degradation of the resin is likely to occur. Thus, if the temperature of the disc is set high without increasing the temperature of the stock solution, the powder is heated on the disc in a short period of time and the viscosity decreases, so that fine powder can be produced without thermal degradation of the resin. For the same reason, there is an advantage that a raw material having a slightly higher melt viscosity can be used.
【0010】次に、実施例及び比較例によってさらに本
発明を説明する。Next, the present invention will be further described with reference to Examples and Comparative Examples.
【0011】[0011]
【実施例1】図1のような直径100mmのディスクの下
にコイルを取り付け、1kWの高周波発生器に接続し、デ
ィスク温度を250℃に設定した。雰囲気温度を140
℃とし、ディスクを25000rpm で回転させ、25℃
における0.5%メタクレゾール溶液の相対粘度が1.
2であるナイロン12(融点175℃)を250℃に加
熱した原液を2.5kg/hr で供給した。このとき得られ
た製品は、平均径35μm の白色粉末であった。EXAMPLE 1 A coil was mounted under a disk having a diameter of 100 mm as shown in FIG. 1 and connected to a 1 kW high frequency generator, and the disk temperature was set at 250 ° C. Ambient temperature 140
° C, spin the disc at 25000 rpm,
The relative viscosity of the 0.5% meta-cresol solution at 1.
A stock solution obtained by heating Nylon 12 (melting point: 175 ° C.) to 250 ° C. was supplied at 2.5 kg / hr. The product obtained at this time was a white powder having an average diameter of 35 μm.
【0012】[0012]
【実施例2】図1のように直径100mmのディスクの下
にコイルを取り付け、1kWの高周波発生器に接続し、デ
ィスク温度を350℃に設定した。雰囲気温度を140
℃とし、ディスクを25000rpm で回転させ、25℃
における0.5%メタクレゾール溶液の相対粘度が1.
2であるナイロン12(融点175℃)を250℃に加
熱した原液を2.5kg/hr で供給した。このとき得られ
た製品は、平均径10μm の白色粉末であった。Example 2 As shown in FIG. 1, a coil was mounted under a disk having a diameter of 100 mm, connected to a 1 kW high frequency generator, and the disk temperature was set at 350.degree. Ambient temperature 140
° C, spin the disc at 25000 rpm,
The relative viscosity of the 0.5% meta-cresol solution at 1.
A stock solution obtained by heating Nylon 12 (melting point: 175 ° C.) to 250 ° C. was supplied at 2.5 kg / hr. The product obtained at this time was a white powder having an average diameter of 10 μm.
【0013】[0013]
【実施例3】図1のように直径100mmのディスクの
下にコイルを取り付け、1kwの高周波発生器に接続
し、ディスク温度を350℃に設定した。雰囲気温度を
140℃とし、ディスクを25000rpmで回転さ
せ、25℃における0.5%メタクレゾール溶液の相対
粘度が1.4であるナイロン12(融点178℃)を、
250℃に加熱した原液を2.5kg/hrで供給し
た。このとき得られた製品は、平均径40μmの白色粉
末であった。Embodiment 3 As shown in FIG. 1, a coil was mounted under a disk having a diameter of 100 mm, connected to a 1 kW high frequency generator, and the disk temperature was set at 350.degree. The temperature of the atmosphere was 140 ° C., the disk was rotated at 25000 rpm, and the relative viscosity of a 0.5% meta-cresol solution at 25 ° C. was 1.4 in nylon 12 (melting point: 178 ° C.).
A stock solution heated to 250 ° C. was supplied at 2.5 kg / hr. The product obtained at this time was a white powder having an average diameter of 40 μm.
【0014】[0014]
【比較例1】図2のように、雰囲気温度を140℃と
し、ディスク加熱用の熱風を250℃に設定した。この
ときのディスクの実測温度は、165℃であった。ディ
スクを25000rpm で回転させ、25℃における0.
5%メタクレゾール溶液の相対粘度が1.2であるナイ
ロン12(融点175℃)を250℃に加熱した原液を
2.5kg/hr で供給した。このとき得られた製品は白い
綿状であった。Comparative Example 1 As shown in FIG. 2, the ambient temperature was set at 140 ° C., and the hot air for heating the disk was set at 250 ° C. The measured temperature of the disk at this time was 165 ° C. The disk was spun at 25000 rpm, and the
A stock solution obtained by heating nylon 12 (melting point: 175 ° C.) having a relative viscosity of 5% meta-cresol solution of 1.2 to 250 ° C. was supplied at 2.5 kg / hr. The product obtained at this time was white floc.
【0015】[0015]
【比較例2】図2のように、雰囲気温度を140℃と
し、ディスク加熱用の熱風を350℃に設定した。この
ときのディスクの実測温度は、200℃であった。ディ
スクを25000rpm で回転させ、25℃における0.
5%メタクレゾール溶液の相対粘度が1.2であるナイ
ロン12(融点175℃)を、250℃に加熱した原液
を2.5kg/hrで供給した。このとき得られた製品は平
均径100μm の白色粉末であった。Comparative Example 2 As shown in FIG. 2, the ambient temperature was set at 140 ° C., and the hot air for heating the disk was set at 350 ° C. The measured temperature of the disk at this time was 200 ° C. The disk was spun at 25000 rpm, and the
A stock solution of nylon 12 (melting point: 175 ° C.) having a relative viscosity of 5% meta-cresol solution of 1.2 and heated to 250 ° C. was supplied at 2.5 kg / hr. The product obtained at this time was a white powder having an average diameter of 100 μm.
【0016】[0016]
【比較例3】図2のように、雰囲気温度を140℃と
し、ディスク加熱用の熱風を350℃に設定した。この
ときのディスクの実測温度は、200℃であった。ディ
スクを25000rpm で回転させ、25℃における0.
5%メタクレゾール溶液の相対粘度が1.2であるナイ
ロン12(融点175℃)を、350℃に加熱した原液
を2.5kg/hr で供給した。このとき得られた製品は平
均径18μm の褐色粉末であった。Comparative Example 3 As shown in FIG. 2, the ambient temperature was set at 140 ° C., and the hot air for heating the disk was set at 350 ° C. The measured temperature of the disk at this time was 200 ° C. The disk was spun at 25000 rpm, and the
Nylon 12 (melting point: 175 ° C.) having a relative viscosity of 5% meta-cresol solution of 1.2 was heated at 350 ° C., and a stock solution was supplied at 2.5 kg / hr. The product obtained at this time was a brown powder having an average diameter of 18 μm.
【0017】[0017]
【比較例4】図2のように、雰囲気温度を140℃と
し、ディスク加熱用の熱風を350℃に設定した。この
ときのディスクの実測温度は、200℃であった。ディ
スクを25000rpm で回転させ、25℃における0.
5%メタクレゾール溶液の相対粘度が1.4であるナイ
ロン12(融点178℃)を、350℃に加熱した原液
を2.5kg/hrで供給した。このとき得られた製品は褐
色の綿状であった。Comparative Example 4 As shown in FIG. 2, the ambient temperature was set at 140 ° C., and the hot air for heating the disk was set at 350 ° C. The measured temperature of the disk at this time was 200 ° C. The disk was spun at 25000 rpm, and the
A stock solution of nylon 12 (melting point: 178 ° C.) having a relative viscosity of 5% meta-cresol solution of 1.4 heated to 350 ° C. was supplied at 2.5 kg / hr. The product obtained at this time was a brown floc.
【0018】[0018]
【発明の効果】以上のように、本発明によれば、従来法
と比べて粒度の小さい真球に近い樹脂粉末が、熱劣化も
なく容易に製造することができる。また、比較的溶融粘
度の高い樹脂原料も使用できる。As described above, according to the present invention, a resin powder close to a true sphere having a smaller particle size than the conventional method can be easily produced without thermal deterioration. In addition, a resin material having a relatively high melt viscosity can be used.
【図1】本発明の誘導加熱用のコイルを取り付けた状態
のアトマイザーディスクの図。FIG. 1 is a diagram of an atomizer disk with an induction heating coil according to the present invention attached thereto.
【図2】従来法の熱風による加熱を行う場合のアトマイ
ザーディスクの図。FIG. 2 is a diagram of an atomizer disk when heating with hot air according to a conventional method.
1 ディスク 2 コイル 3 放射温度計 4 高周波発生器 5 温度調節器 6 温度指示計 7 原液 8 熱風(雰囲気温度維持用) 9 冷風 10 熱風(ディスク加熱用) 11 断熱材 DESCRIPTION OF SYMBOLS 1 Disc 2 Coil 3 Radiation thermometer 4 High frequency generator 5 Temperature controller 6 Temperature indicator 7 Undiluted solution 8 Hot air (for maintaining atmospheric temperature) 9 Cold air 10 Hot air (for disk heating) 11 Insulation material
フロントページの続き (58)調査した分野(Int.Cl.6,DB名) B29B 9/10 C08J 3/12Continuation of front page (58) Field surveyed (Int.Cl. 6 , DB name) B29B 9/10 C08J 3/12
Claims (2)
って噴霧冷却造粒するに当たって、回転ディスクを誘導
加熱によって加熱することを特徴とする噴霧冷却造粒方
法。1. A spray cooling granulation method, wherein a rotary disk is heated by induction heating in spray cooling and granulating a molten resin by a disk atomizing method.
の噴霧冷却造粒装置において、磁性体からなる回転ディ
スクの近傍にコイルを設置し、このコイルに高周波発生
器を接続し、回転ディスクを誘導加熱することを特徴と
する樹脂造粒装置。2. A spray cooling and granulating apparatus for molten resin by a disk atomization method, wherein a coil is installed near a rotating disk made of a magnetic material, a high frequency generator is connected to the coil, and the rotating disk is induction-heated. A resin granulating apparatus characterized by the above-mentioned.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3194120A JP2840642B2 (en) | 1991-08-02 | 1991-08-02 | Resin granulation method and apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3194120A JP2840642B2 (en) | 1991-08-02 | 1991-08-02 | Resin granulation method and apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0531719A JPH0531719A (en) | 1993-02-09 |
JP2840642B2 true JP2840642B2 (en) | 1998-12-24 |
Family
ID=16319251
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3194120A Expired - Lifetime JP2840642B2 (en) | 1991-08-02 | 1991-08-02 | Resin granulation method and apparatus |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2840642B2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3695683B2 (en) * | 1998-02-16 | 2005-09-14 | 住友ベークライト株式会社 | Resin composition milling equipment |
KR20020025224A (en) * | 2000-06-23 | 2002-04-03 | 스미토모 베이클리트 컴퍼니 리미티드 | Grinding device for resin composition |
WO2015115148A1 (en) * | 2014-01-31 | 2015-08-06 | 三菱瓦斯化学株式会社 | Method for granulating polyamide or polyamide composition |
-
1991
- 1991-08-02 JP JP3194120A patent/JP2840642B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH0531719A (en) | 1993-02-09 |
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