JPH07112697B2 - Method for producing thermoplastic resin spherical particles - Google Patents
Method for producing thermoplastic resin spherical particlesInfo
- Publication number
- JPH07112697B2 JPH07112697B2 JP1212490A JP21249089A JPH07112697B2 JP H07112697 B2 JPH07112697 B2 JP H07112697B2 JP 1212490 A JP1212490 A JP 1212490A JP 21249089 A JP21249089 A JP 21249089A JP H07112697 B2 JPH07112697 B2 JP H07112697B2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- die
- cutter blade
- particles
- spherical particles
- 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 - Fee Related
Links
Landscapes
- Processes Of Treating Macromolecular Substances (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本願発明は、熱可塑性樹脂を特殊な条件で押出した後、
ホツトカツトすることにより、真球状の熱可塑性樹脂球
状粒子の製造法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is directed to extruding a thermoplastic resin under special conditions,
The present invention relates to a method for producing spherical spherical thermoplastic resin particles by hot-cutting.
（従来の技術） 熱可塑性樹脂成形材料の形態は、射出成形、押出成形、
発泡成形などの成形において一般に粒子状が多く使用さ
れている。このような粒子の製造法にはストランドカツ
ト法、シートカツト法、ホツトカツト法、水中カツト法
などがあるが、その粒子形状は円柱状、角状、偏平状で
あることが多く、真球状といえるものはほとんどない。
例えば特開昭61−195808号公報には水中カツト法による
球状粒子の製造法が記載されているが、ダイ先端部が水
中にあつてダイ表面が冷えた状態にあるため、ポリエチ
レンやポリプロピレンなど特定の樹脂を除き多くの熱可
塑性樹脂は安定した造粒ができず、この製造法の採用は
困難であつた。すなわち、ポリエチレンやポリプロピレ
ンなどのオレフイン系樹脂以外の多くの熱可塑性樹脂は
ポリエチレンやポリプロピレンなどのオレフイン系樹脂
に比べて溶融粘度の温度依存性が大きいためか、ダイ部
での溶融樹脂の温度低下によつて粘度が高くなり、スク
リユーモーターの負荷が増大したり、溶融樹脂の吐出流
が不安定となり形状が一定せず、また冷却水温度が低く
すぎるとノズル部で樹脂が固化してしまうなど、形状の
安定した粒子を製造するのは困難であつた。(Prior Art) The form of the thermoplastic resin molding material is injection molding, extrusion molding,
Generally, many particles are used in molding such as foam molding. The method for producing such particles includes a strand cut method, a sheet cut method, a hot cut method, and an underwater cut method, but the particle shape is often cylindrical, angular, or flat, and can be said to be a true sphere. Almost never.
For example, Japanese Unexamined Patent Publication No. 61-195808 describes a method for producing spherical particles by an underwater cutting method, but since the die tip is in water and the die surface is cold, polyethylene or polypropylene is specified. Except for the above resins, many thermoplastic resins could not be stably granulated, and it was difficult to adopt this production method. That is, because many thermoplastic resins other than olefin resins such as polyethylene and polypropylene have a greater temperature dependence of melt viscosity than olefin resins such as polyethylene and polypropylene, the temperature drop of the molten resin in the die part may occur. Therefore, the viscosity becomes high, the load on the screw motor increases, the discharge flow of molten resin becomes unstable, the shape is not constant, and if the cooling water temperature is too low, the resin solidifies at the nozzle part, etc. However, it was difficult to produce particles having a stable shape.
（発明が解決しようとする課題） 本願発明の目的は、従来の熱可塑性樹脂粒子の製造法で
は困難であつた上述した如き問題点を解決し形状の揃つ
た、かつ真球上の小球状粒子を効率良く製造する熱可塑
性樹脂球状粒子の製造法を提供することである。(Problems to be Solved by the Invention) The object of the present invention is to solve the problems as described above, which are difficult in the conventional method for producing thermoplastic resin particles, and have a uniform shape, and small spherical particles on a true sphere. It is to provide a method for producing thermoplastic resin spherical particles, which efficiently produces
（課題を解決するための手段） 本願発明者らは上述した如き現状に鑑み、鋭意検討した
結果、熱可塑性樹脂を溶融押出機から押出して粒状化す
る際にホツトカツト法を採用し、かつ溶融樹脂温度を特
定の温度範囲とし、さらに特定範囲の樹脂吐出量とする
ことにより、真球状の小球状粒子とし得ることを見出し
本願発明に到達した。(Means for Solving the Problems) The inventors of the present invention have made diligent studies in view of the above-mentioned current situation, and as a result, employ a hot-cut method when the thermoplastic resin is extruded from a melt extruder and granulated, and the molten resin is used. The present invention has been found that small spherical particles having a true spherical shape can be obtained by setting the temperature in a specific temperature range and by setting the amount of resin discharged in a specific range.
すなわち本願発明は、熱可塑性樹脂を押出機先端部に設
けたダイ出口における溶融樹脂温度が該樹脂の流れ温度
（ASTM D569−82による。）＋50〜120℃の範囲であつ
て、ノズル１孔当りでかつカツター刃１枚当りの樹脂吐
出量が0.3〜3kg/時間の範囲となるように押出機ダイよ
り溶融押出した直後、該ダイ面上で回転する少なくとも
１枚のカツター刃により空気中にて前記樹脂吐出物を切
断し、粒状物とした後、冷却して球状粒子とすることを
特徴とする熱可塑性樹脂球状粒子の製造法を要旨とする
ものである。That is, according to the invention of the present application, the temperature of the molten resin at the die outlet provided with the thermoplastic resin at the tip of the extruder is in the range of the flow temperature of the resin (according to ASTM D569-82) +50 to 120 ° C, and per nozzle hole Immediately after melt-extruding from the extruder die so that the amount of resin discharged per cutter blade is in the range of 0.3 to 3 kg / hour, in air by at least one cutter blade rotating on the die surface. The gist of the present invention is to provide a method for producing spherical particles of a thermoplastic resin, characterized in that the resin discharge product is cut into granules and then cooled to obtain spherical particles.
本願発明の最も大きな特徴とするところは、ホツトカツ
ト法により粒子を得ること、かつダイ出口における溶融
樹脂温度を特定範囲の温度範囲としたこと、さらにノズ
ル１孔当りのカツター刃１枚当りの樹脂吐出量を特定範
囲に規定したことの三つの条件を同時に満足することに
より真球状でかつ小さな粒子径を有する熱可塑性球状粒
子とし得た点である。The most significant feature of the present invention is that particles are obtained by the hot-cutting method, the temperature of the molten resin at the die outlet is within a specific range, and the resin is discharged from one cutter blade per nozzle hole. The point is that thermoplastic spherical particles having a true spherical shape and a small particle diameter can be obtained by simultaneously satisfying the three conditions of defining the amount in a specific range.
本願発明についてさらに詳しく説明すると、押出機先端
部に設けたダイ出口における溶融樹脂温度が、上記範囲
より高いとダイより吐出した樹脂溶融物のカツター刃に
よる切れが悪く、ヒゲ付き粒子になつたり、粒子同志が
融着し易くなる。より悪いケースでは、ダイとカツター
刃の間に樹脂溶融物が入りこみカツター刃の回転が不能
となることもある。また、溶融樹脂温度が上記範囲より
低いと、ダイからの樹脂溶融物の吐出が不安定となり、
吐出物の表面に不規則な凹凸または波形が発生するばか
りでなく、形状も円柱状になり易く真球状とならない。
安定して真球状の小球状粒子を製造するため、押出機の
温度調節により、ダイ出口の溶融樹脂温度を上記範囲内
に、より望ましくは該樹脂の流れ温度＋60〜110℃の範
囲内で実施するとよい。（なお、ここでの流連温度はAS
TM D569−82による。） 以上のように溶融樹脂温度を上記範囲内に調整すること
の他に、特に重要なものは、ダイからの樹脂の吐出量で
ある。すなわち、ノズル１孔当りのホツトカツト法によ
るカツター刃１枚当りの樹脂吐出量が、0.3〜3kg/時間
の範囲であることが必要である。樹脂吐出量は上記範囲
より小さいと偏平状に、大きいと細長状となり真球状が
得られない。樹脂吐出量はスクリユーの回転数やダイの
穴数によりほぼ決まるが、この吐出量に合わせてカツタ
ー刃の枚数およびカツター刃の回転数を調整すればよ
い。あくまでも、ノズル１孔当りでかつカツター刃１枚
当りの樹脂吐出量を上記範囲内に調整することが必要で
ある。また、目標とする直径の真球状粒子を得るには、
樹脂の種類や押出機の運転条件により変化し得るが、ダ
イノズル部の穴系を目標とする直径の30〜80％の範囲で
設定すればよい。Explaining the present invention in more detail, the molten resin temperature at the die outlet provided at the extruder tip is poorly cut by a cutter blade of the resin melt discharged from the die when it is higher than the above range, resulting in beard particles. The particles are easily fused with each other. In a worse case, the resin melt may enter between the die and the cutter blade, and the cutter blade may not rotate. If the molten resin temperature is lower than the above range, the discharge of the resin melt from the die becomes unstable,
Not only irregular irregularities or corrugations are generated on the surface of the ejected material, but also the shape is likely to be cylindrical and not spherical.
In order to stably produce true spherical small spherical particles, the temperature of the extruder is adjusted so that the temperature of the molten resin at the die outlet is within the above range, more preferably, the flow temperature of the resin is within the range of +60 to 110 ° C. Good to do. (Note that the continuous temperature here is AS
According to TM D569-82. In addition to adjusting the molten resin temperature within the above range as described above, what is particularly important is the amount of resin discharged from the die. That is, it is necessary that the amount of resin discharged per one cutter blade by the hot-cut method per nozzle hole is in the range of 0.3 to 3 kg / hour. If the resin discharge amount is smaller than the above range, the resin discharge amount becomes flat, and if the resin discharge amount is larger than the above range, it becomes elongated and a true spherical shape cannot be obtained. The amount of resin discharged is substantially determined by the number of revolutions of the screw and the number of holes in the die, but the number of cutter blades and the number of revolutions of the cutter blade may be adjusted according to this amount of discharge. It is absolutely necessary to adjust the resin discharge amount per nozzle hole and per cutter blade within the above range. Also, to obtain a true spherical particle with a target diameter,
Although it may vary depending on the type of resin and the operating conditions of the extruder, the hole system of the die nozzle may be set within the range of 30 to 80% of the target diameter.
以下、本発明を図面に従つて説明する。Hereinafter, the present invention will be described with reference to the drawings.
ホツトカツト装置内でダイ面上で回転するカツター刃に
よる切断において、押出機（１）のダイス（３）より押
出した直後、カツター刃（５）によつて切断した粒子
は、ホツトカツト装置（２）内の外周方向に飛ばされ、
ホツトカツト装置（２）内壁に沿つて急速に流れている
水や空気などの流体、望ましくは水によつて急冷され、
粒子の融着を防いで切断される。なお、ここでの流体は
注入口（６）より圧送されホツトカツト装置（２）内壁
に沿つて流れながら、カツター刃（５）によつてカツト
されたいまだ熱い粒子を冷却し、該冷却粒子とともに排
出口（７）より排出される。なお図中（３）はカツター
刃（５）を回転させるモーターである。In cutting with a cutter blade rotating on the die surface in the hot-cutting device, immediately after being extruded from the die (3) of the extruder (1), the particles cut by the cutting blade (5) are in the hot-cutting device (2). Is skipped in the outer peripheral direction of
The hot-cutting device (2) is rapidly cooled by a fluid such as water or air flowing along the inner wall, preferably water,
It is cut while preventing fusion of particles. The fluid here is pressure-fed from the injection port (6) and flows along the inner wall of the hot-cutting device (2) while cooling the still hot particles to be cut by the cutter blade (5) and discharging with the cooling particles. It is discharged from the outlet (7). In the figure, (3) is a motor for rotating the cutter blade (5).
第２図および第３図は、カツター刃（５）側からみた図
で、第２図は一枚のカツター刃を用いた例、第２図は二
枚のカツター刃を用いた例である。図中（８）はノズル
孔である。2 and 3 are views seen from the cutter blade (5) side. FIG. 2 shows an example using one cutter blade, and FIG. 2 shows an example using two cutter blades. In the figure, (8) is a nozzle hole.
本願発明において使用される熱可塑性樹脂は、限定され
ないが、例えばスチレン系樹脂（ポリスチレン、AS樹
脂、ABS樹脂）、アクリル樹脂、ポリカーボネート、変
性PPEなどが挙げられる。The thermoplastic resin used in the present invention is not limited, and examples thereof include styrene resins (polystyrene, AS resin, ABS resin), acrylic resin, polycarbonate, modified PPE and the like.
本願発明により得られる粒状粒子は、真球状でそのサイ
ズが0.5mm〜3mmの範囲で小さく、かつ均一の球状粒子で
あり、今迄に得られたものでなく、例えば吸音構造体、
フイルター等の成形材料として使用することができる。The granular particles obtained by the present invention are spherical particles having a size in the range of 0.5 mm to 3 mm, which are small and uniform spherical particles, which have not been obtained so far, for example, a sound absorbing structure,
It can be used as a molding material such as a filter.
（実施例） 実施例１〜5,比較例１〜４ スクリユー径40mm押出機のダイ先端部のノズル（ノズル
数12個、ノズル穴径1.2mm）より、ABS樹脂（三菱レイヨ
ン ダイヤペツトABS1001）（流れ温度140℃）を溶融押
出した直後、図面に示したホツトカツト装置を用いて、
ダイ面上で回転するカツター刃により空気中にて樹脂溶
融物を切断し粒状物とした後、流水で冷却し、排出口よ
り流水とともに排出して、真球状の小球状粒子を第１表
に示す溶融樹脂温度、樹脂吐出量などの製造条件を変更
して得られた粒子の形状を観察した。その結果を第１表
に示す。この表からも明らかなように、本発明の方法に
よる場合は、球状の粒子が得られることが確認された。(Examples) Examples 1 to 5, Comparative Examples 1 to 4 From a nozzle (12 nozzles, nozzle hole diameter 1.2 mm) at the die tip of an extruder having a screw diameter of 40 mm, ABS resin (Mitsubishi Rayon Diapet PET ABS1001) (flow) Immediately after melt-extruding (temperature 140 ℃), using the hot-cut device shown in the drawing,
After cutting the resin melt in the air with a cutter blade rotating on the die surface to make a granular material, it is cooled with running water and discharged together with running water from the discharge port, and spherical small spherical particles are shown in Table 1. The shape of the particles obtained by changing the manufacturing conditions such as the temperature of the molten resin and the discharge amount of the resin was observed. The results are shown in Table 1. As is clear from this table, it was confirmed that spherical particles were obtained by the method of the present invention.
（発明の効果） 本願発明によれば押出機から溶融樹脂を押出して粒状化
する際にホツトカツト法を採用し、かつ溶融樹脂温度と
樹脂吐出量を特定範囲に調整するだけで、これまで多く
の熱可塑性樹脂にとつて製造が困難であつた真球状の小
球状粒子の製造ができる。 (Effect of the Invention) According to the present invention, a hot-cut method is adopted when the molten resin is extruded and granulated by an extruder, and the molten resin temperature and the resin discharge amount are adjusted within a specific range, and thus many It is possible to produce small spherical particles having a true spherical shape, which is difficult to produce with a thermoplastic resin.
なお本願発明により製造された真球状の小球状粒子は吸
音構造体やフイルターなどに、また、回転成形用の成形
材料として幅広い産業分野での用途に利用できるもので
ある。The true spherical small spherical particles produced by the present invention can be used for a sound absorbing structure, a filter and the like, and as a molding material for rotational molding in a wide range of industrial fields.
第１図は本発明で用いるホツトカツト装置の形状の一例
を示す縦断面図、第２図および第３図はダイスとカツタ
ー刃の正面図で、第２図はカツター刃が一枚、第３図は
カツター刃が２枚の例を示す。 １……押出機 ２……ホツトカツト装置 ３……モーター ４……ダイス ５……カツター刃 ６……流体注入口 ７……排出口 ８……ノズル孔FIG. 1 is a vertical sectional view showing an example of the shape of a hot-cutting device used in the present invention, FIGS. 2 and 3 are front views of a die and a cutter blade, and FIG. 2 is one cutter blade, FIG. Shows an example with two cutter blades. 1 ... Extruder 2 ... Hot cutting device 3 ... Motor 4 ... Die 5 ... Cutter blade 6 ... Fluid inlet 7 ... Discharge port 8 ... Nozzle hole
Claims (1)
イ出口における溶融樹脂温度が該樹脂の流れ温度（ASTM
D569−82による。）＋50〜120℃の範囲であって、ノ
ズル１孔当りで、かつカッター刃１枚当りの樹脂吐出量
が0.3〜3kg/時間の範囲となるように押出機ダイより溶
融押出した直後、該ダイ面上で回転する少なくとも１枚
のカッター刃により、空気中にて前記樹脂吐出物を切断
し、粒状物とした後冷却して球状粒子とすることを特徴
とする熱可塑性樹脂球状粒子の製造法。1. The temperature of the molten resin at the die outlet provided at the tip of the extruder is the flow temperature of the resin (ASTM).
According to D569-82. ) Within the range of +50 to 120 ° C, immediately after melt extrusion from the extruder die so that the resin discharge amount per nozzle hole and cutter blade per sheet is in the range of 0.3 to 3 kg / hour. A method for producing spherical particles of thermoplastic resin, characterized in that the resin discharge product is cut in the air by at least one cutter blade rotating on a plane to form a granular product and then cooled to form a spherical particle. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1212490A JPH07112697B2 (en) | 1989-08-18 | 1989-08-18 | Method for producing thermoplastic resin spherical particles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1212490A JPH07112697B2 (en) | 1989-08-18 | 1989-08-18 | Method for producing thermoplastic resin spherical particles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0376721A JPH0376721A (en) | 1991-04-02 |
| JPH07112697B2 true JPH07112697B2 (en) | 1995-12-06 |
Family
ID=16623517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1212490A Expired - Fee Related JPH07112697B2 (en) | 1989-08-18 | 1989-08-18 | Method for producing thermoplastic resin spherical particles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07112697B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07110497B2 (en) * | 1989-08-30 | 1995-11-29 | 三菱電機ホーム機器株式会社 | Method for producing porous structure using thermoplastic resin material |
| US5525274A (en) * | 1994-06-29 | 1996-06-11 | Davidson Textron Inc. | Process for manufacturing plastic microspheres |
| JPH0890556A (en) * | 1994-09-20 | 1996-04-09 | Kanegafuchi Chem Ind Co Ltd | Olefin resin particl and production of prefoaming particle |
| GB0403098D0 (en) * | 2004-02-12 | 2004-03-17 | Euro Celtique Sa | Extrusion |
| TWI350762B (en) | 2004-02-12 | 2011-10-21 | Euro Celtique Sa | Particulates |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61195808A (en) * | 1985-02-26 | 1986-08-30 | Japan Styrene Paper Co Ltd | Manufacture of globular particle made of thermoplastic synthetic resin |
-
1989
- 1989-08-18 JP JP1212490A patent/JPH07112697B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61195808A (en) * | 1985-02-26 | 1986-08-30 | Japan Styrene Paper Co Ltd | Manufacture of globular particle made of thermoplastic synthetic resin |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0376721A (en) | 1991-04-02 |
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