JPH07171910A - Stirring rod made of thermoplastic resin - Google Patents
Stirring rod made of thermoplastic resinInfo
- Publication number
- JPH07171910A JPH07171910A JP32023793A JP32023793A JPH07171910A JP H07171910 A JPH07171910 A JP H07171910A JP 32023793 A JP32023793 A JP 32023793A JP 32023793 A JP32023793 A JP 32023793A JP H07171910 A JPH07171910 A JP H07171910A
- Authority
- JP
- Japan
- Prior art keywords
- thermoplastic resin
- gas
- shaft
- stirring rod
- stirring
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Accessories For Mixers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は撹拌棒に関するものであ
る。更に詳しくは、ガスアシスト成形法による一体成形
された熱可塑性樹脂からなる撹拌棒に関するものであ
る。FIELD OF THE INVENTION The present invention relates to a stirring bar. More specifically, the present invention relates to a stirring rod made of a thermoplastic resin integrally molded by a gas assist molding method.
【０００２】[0002]
【従来の技術】撹拌棒は、一般機械、精密機械、電気・
電子等の各分野に機構部品として広く用いられている。
従来の撹拌棒は、樹脂製撹拌翼を金属製軸に取り付けて
生産されていたが、生産性やコスト面及び製品形状が自
由になるという点で、軸と撹拌翼の一体成形が要望され
ていた。2. Description of the Related Art Stirring rods are used for general machinery, precision machinery, electric
It is widely used as mechanical parts in various fields such as electronics.
Conventional stirring rods were produced by attaching resin stirring blades to a metal shaft, but there is a demand for integral molding of the shaft and stirring blades in terms of productivity, cost, and product shape. It was
【０００３】しかし、熱可塑性樹脂は射出成形を行う
時、金型内で溶融状態から固化する際に大きく収縮して
しまうため、金型の寸法精度通りの成形品を得る事は難
しい。特に撹拌棒を通常の射出成形で軸と撹拌翼を一体
成形した場合、撹拌翼の厚みと軸直径に差がある為、軸
の成形収縮の影響が撹拌翼にまで及んでしまい、撹拌翼
の平面性が崩れてしまう。平面性が崩れ撹拌翼が変形し
てしまうと、実際の製品にこの撹拌棒を組み込んだ場
合、設計通りの撹拌が行なわれず、撹拌ムラを生じ問題
となる。However, when the thermoplastic resin is injection-molded, it largely shrinks when it is solidified from the molten state in the mold, so that it is difficult to obtain a molded product having the dimensional accuracy of the mold. In particular, when a shaft and a stirring blade are integrally molded by a normal injection molding of a stirring rod, there is a difference in the thickness and the shaft diameter of the stirring blade, so the influence of the molding shrinkage of the shaft reaches the stirring blade and the stirring blade The flatness is lost. If the flatness is lost and the stirring blade is deformed, when this stirring rod is incorporated in an actual product, stirring as designed is not performed, and uneven stirring occurs, which is a problem.
【０００４】その故、従来では軸と撹拌翼を別個に制作
し、それらを組み合わせ生産することで、要求される撹
拌翼の平面性を確保していた。しかしながら、軸と撹拌
翼を別個に制作し組立るには、多くの労力、時間、設備
を必要とし、短時間で安価に生産する事が困難であっ
た。Therefore, conventionally, the required flatness of the stirring blade has been ensured by separately manufacturing the shaft and the stirring blade and manufacturing them in combination. However, it takes a lot of labor, time, and equipment to separately manufacture and assemble the shaft and the stirring blade, and it has been difficult to inexpensively produce them in a short time.
【０００５】[0005]
【発明が解決しようとする課題】本発明の目的は、１回
の射出成形で、短時間に安価に生産される、要求される
平面性をもつ撹拌翼を有する撹拌棒を提供することにあ
る。SUMMARY OF THE INVENTION An object of the present invention is to provide a stirring rod having a stirring blade having a required flatness, which can be produced at low cost in a short time by one injection molding. .
【０００６】[0006]
【課題を解決するための手段】前記課題を解決するため
に本発明者らが鋭意研究重ねた結果、軸に中空構造をも
つ熱可塑性樹脂製撹拌棒が前記の問題点を解決すること
を見出だし、本発明に到達した。つまりガスアシスト成
形法を用いて軸にガスを導入することにより、軸の成形
収縮による撹拌翼の平面性の喪失を抑え、精度の優れた
撹拌棒が得られることを見出だした。As a result of intensive studies conducted by the present inventors to solve the above problems, it was found that a stirring rod made of a thermoplastic resin having a shaft having a hollow structure solves the above problems. The present invention has been reached and the present invention has been reached. That is, it was found that by introducing gas into the shaft by using the gas assist molding method, loss of flatness of the stirring blade due to molding contraction of the shaft can be suppressed and a stirring rod with excellent accuracy can be obtained.
【０００７】すなわち、本発明は、熱可塑性樹脂からな
る撹拌棒であって、該撹拌棒が軸と撹拌翼とからなり、
かつ該軸が熱可塑性樹脂が満たされていない中空部を有
し、しかもガスアシスト成形法により一体成形で射出成
形されたことを特徴とする熱可塑性樹脂製撹拌棒、であ
る。本発明の熱可塑性樹脂製撹拌棒は、撹拌翼の厚みが
0.05mm 以上であることが好ましい。撹拌翼の厚みが
0.05mm より薄くなると撹拌翼に樹脂が流れにくく、一
般的に安定した成形が行えない。また撹拌棒の軸直径に
対する撹拌翼の厚みの割合は５０％以下が一般的であ
り、好ましい。これは重量が大きくなると作動上より多
くのエネルギーを要するためである。That is, the present invention relates to a stirring rod made of a thermoplastic resin, the stirring rod comprising a shaft and stirring blades,
A stirring rod made of a thermoplastic resin, characterized in that the shaft has a hollow portion not filled with the thermoplastic resin, and is injection-molded by integral molding by a gas assist molding method. The thermoplastic resin stirring rod of the present invention has a stirring blade thickness of
It is preferably 0.05 mm or more. The thickness of the stirring blade
If the thickness is less than 0.05 mm, it is difficult for the resin to flow to the stirring blades, and stable molding is generally not possible. The ratio of the thickness of the stirring blade to the shaft diameter of the stirring rod is generally 50% or less, which is preferable. This is because heavier weight requires more energy for operation.
【０００８】また、本発明でいうガスアシスト成形法と
は、射出成形において熱可塑性樹脂を金型キャビティ−
中に射出後、ガス体を樹脂中に注入することにより中空
成形品を得る成形法をいう。本発明の熱可塑性樹脂製撹
拌棒を製造するガスアシスト成形法は、通常の射出成形
機とガス注入装置の組合せによって行われる。ガス注入
装置は、樹脂の射出後に配管を通して樹脂中にガス体を
注入し、設定時間中このガス圧を保持する装置である。
これには注入するガス体を予め高圧に圧縮し、アキュム
レ−タ−に蓄え、ガス注入時に配管を通して高圧ガスを
導入する方式や一定量のガス体をポンプにより連続で送
り込み、加圧していく方式等が考えられるが、射出後の
樹脂中にガス体を送り込めれば如何なる方式も可能であ
る。The gas-assisted molding method referred to in the present invention means that a thermoplastic resin is used in a mold cavity during injection molding.
A molding method in which a hollow molded article is obtained by injecting a gas body into a resin after injection into the resin. The gas-assisted molding method for manufacturing the thermoplastic resin stirring rod of the present invention is carried out by a combination of an ordinary injection molding machine and a gas injection device. The gas injection device is a device that injects a gas body into the resin through a pipe after the resin is injected and maintains this gas pressure for a set time.
For this, the gas body to be injected is compressed to a high pressure in advance, stored in an accumulator, and a method of introducing high pressure gas through a pipe at the time of gas injection or a method of continuously feeding a certain amount of gas body with a pump and pressurizing it. However, any method is possible as long as a gas body is sent into the resin after injection.
【０００９】この時、ガスの注入口はシリンダ−のノズ
ル、金型のスプル−、ランナ−、製品部に直接等の方法
が考えられるが、高圧のガス体を樹脂中に注入できれば
いずれの方法でも実施可能である。本発明に用いられる
熱可塑性樹脂としては、ポリエチレン、ポリプロピレ
ン、ポリスチレン、ＡＢＳ樹脂、ポリ塩化ビニル、ポリ
アミド、ポリアセタ−ル、ポリカ−ボネ−ト、変性ポリ
フェニレンエ−テル、ポリエチレンテレフタレ−ト、ポ
リブチレンテレフタレ−ト、ポリフェニレンスルフィ
ド、ポリイミド、ポリアミドイミド、ポリアリレ−ト、
ポリサルフォン、ポリエ−テルサルフォン、ポエイエ−
テルエ−テルケトン、液晶ポリマ−、ポリテトラフルオ
ロエチレン、熱可塑性エラストマ−等が挙げられるが、
通常の射出成形が可能であれば、如何なる熱可塑性樹脂
も用いることができる。At this time, the gas injection port may be a nozzle of a cylinder, a sprue of a mold, a runner, or a product portion directly. Any method can be used as long as a high-pressure gas can be injected into the resin. But it can be implemented. The thermoplastic resin used in the present invention includes polyethylene, polypropylene, polystyrene, ABS resin, polyvinyl chloride, polyamide, polyacetal, polycarbonate, modified polyphenylene ether, polyethylene terephthalate, polybutylene. Terephthalate, polyphenylene sulfide, polyimide, polyamide imide, polyarylate,
Polysulfone, Polyether-Sulfone, Poeier-
Examples include ter-ether ketone, liquid crystal polymer, polytetrafluoroethylene, and thermoplastic elastomer.
Any thermoplastic resin can be used as long as ordinary injection molding is possible.
【００１０】特にポリアセタ−ル樹脂は耐熱性が高く機
械的物性にも優れ、更には摺動特性にも優れるため撹拌
棒部品として多く用いられており、本発明においても好
適に用いられる。本発明の熱可塑性樹脂製撹拌棒では、
軸に中空部がある為、耐熱性、機械的強度等をアップす
る目的で、必要に応じて無機または有機の充填材を熱可
塑性樹脂に配合することができる。好適な充填材として
は、ガラス繊維、炭素繊維、金属繊維、アラミド繊維、
チタン酸カリウム、アスベスト、炭化ケイ素、セラミッ
ク、窒化ケイ素、硫酸バリウム、硫酸カルシウム、カオ
リン、クレ−、パイロフィライト、ベントナイト、セリ
サイト、ゼオライト、マイカ、雲母、ネフェリンシナイ
ト、タルク、アタルパルジャイト、ウオラストナイト、
ＰＭＦ、フェライト、ケイ酸カルシウム、炭酸カルシウ
ム、炭酸マグネシウム、ドロマイト、酸化亜鉛、酸化チ
タン、酸化マグネシウム、酸化鉄、二流化モリブデン、
黒鉛、石膏、ガラスビ−ズ、ガラスバル−ン、石英、石
英ガラス等の強化充填材を挙げることができ、これらは
中空であってもよい。また、これらの強化充填材は２種
以上を併用する事が可能であり、必要によりシラン系、
チタン系等のカップリング剤で予備処理して使用する事
ができる。Particularly, the polyacetal resin is widely used as a stirring rod part because it has high heat resistance, excellent mechanical properties, and excellent sliding characteristics, and is preferably used in the present invention. In the thermoplastic resin stirring rod of the present invention,
Since the shaft has a hollow portion, an inorganic or organic filler can be blended with the thermoplastic resin as needed for the purpose of improving heat resistance, mechanical strength and the like. Suitable fillers include glass fiber, carbon fiber, metal fiber, aramid fiber,
Potassium titanate, asbestos, silicon carbide, ceramics, silicon nitride, barium sulfate, calcium sulfate, kaolin, clay, pyrophyllite, bentonite, sericite, zeolite, mica, mica, nepheline sinite, talc, atalpulgite, Wollastonite,
PMF, ferrite, calcium silicate, calcium carbonate, magnesium carbonate, dolomite, zinc oxide, titanium oxide, magnesium oxide, iron oxide, molybdenum disulfide,
Reinforcing fillers such as graphite, gypsum, glass beads, glass balloons, quartz, and quartz glass can be mentioned, and these may be hollow. Further, these reinforcing fillers can be used in combination of two or more, and if necessary, a silane type,
It can be used after pretreatment with a coupling agent such as titanium.
【００１１】また充填材として炭素繊維、金属繊維、黒
鉛のうちの１種以上を選択すれば、撹拌棒自体の電気抵
抗値を下げることができるため、撹拌される物が粉体や
微小な物体の場合には静電気による付着を抑制でき好適
である。本発明の熱可塑性樹脂製撹拌棒の製造で用いる
ガス体としては、窒素やヘリウム、ネオン、アルゴン、
水蒸気等の不活性ガスが挙げられるが、樹脂に対して不
活性であれば如何なるガス体も用いることができる。ま
た、これらのガス体を用いるときは通常不純物が含まれ
るが、あまり不純物成分が多いと成形時に樹脂の分解や
ヤケを生じる場合があるので好ましくない。経済性を考
慮すると工業的には窒素ガスがより好適に使用される。If at least one of carbon fiber, metal fiber and graphite is selected as the filler, the electric resistance value of the stirring rod itself can be lowered, so that the agitated object is a powder or a minute object. In the case of, it is preferable because adhesion due to static electricity can be suppressed. The gas body used in the production of the thermoplastic resin stirring rod of the present invention, nitrogen or helium, neon, argon,
An inert gas such as water vapor can be used, but any gas can be used as long as it is inert to the resin. Further, when these gas bodies are used, impurities are usually contained, but if the amount of impurities is too large, the resin may be decomposed or burned during molding, which is not preferable. Nitrogen gas is more preferably used industrially in consideration of economy.
【００１２】本発明の熱可塑性樹脂製撹拌棒の成形法で
は、軸の全体もしくは一部にガスを導くことにより、収
縮を抑えることができる。ガスアシスト成形法では樹脂
中にガス体が供給され樹脂の収縮を補い、更に樹脂を効
果的に金型に密着させることが可能であるため寸法精度
が良好になると予想される。通常の射出成形でも樹脂の
収縮を保圧をかけることにより補うことができるが、ゲ
−トシ−ル後はゲ−ト部で樹脂が固化しているので圧力
が伝わらなくなる。In the method for molding a stirring rod made of a thermoplastic resin according to the present invention, the shrinkage can be suppressed by introducing a gas to the whole or a part of the shaft. In the gas-assisted molding method, it is expected that the dimensional accuracy will be improved because a gas body is supplied into the resin to compensate for the shrinkage of the resin and the resin can be effectively brought into close contact with the mold. Even in normal injection molding, the shrinkage of the resin can be compensated by applying a holding pressure, but after the gate seal, the resin is solidified at the gate portion, so the pressure cannot be transmitted.
【００１３】しかし、ガスアシスト成形法ではゲ−トシ
−ル後もガス体によってキャビティ−内部に圧力がかか
るため、良好な結果が得られると考えられる。しかしな
がら、単に撹拌棒の任意の部分にガスを導入するだけで
は撹拌棒の寸法精度、特に撹拌翼の平面性を向上させる
ことは困難である。なぜなら撹拌翼は軸に比べ薄肉であ
るため剛性が小さく、軸の成形収縮の影響を受けて変形
しやすく、中空部は軸の成形収縮を縮小させるか、もし
くは軸の成形収縮の影響を撹拌翼に伝わらなくするよう
な形で形成させなければ効果は薄いからである。However, in the gas-assisted molding method, it is considered that good results can be obtained because pressure is applied to the inside of the cavity by the gas body even after the gate seal. However, it is difficult to improve the dimensional accuracy of the stirring rod, especially the flatness of the stirring blade, by simply introducing the gas into any part of the stirring rod. Because the stirring blade is thinner than the shaft, its rigidity is low and it is easily deformed under the influence of the molding shrinkage of the shaft, and the hollow part reduces the molding shrinkage of the shaft or the stirring shrinkage effect of the shaft molding shrinkage. This is because the effect is weak unless it is formed in such a way that it cannot be transmitted to the human body.
【００１４】本発明の熱可塑性樹脂製撹拌棒では、撹拌
翼に接触している軸部分にガスを通すことにより軸部分
の成形収縮を減少させ、同時に軸の成形収縮の影響が撹
拌翼に及ぶのを妨げる役割を果たし、効果的に撹拌翼の
変形を抑えることができたと考えられる。このため、良
好な平面性を有する撹拌棒をガスアシスト成形法を利用
して成形するには、撹拌翼の接触している軸部分全体に
可能な限り広く中空部分を導くのが望ましい。In the thermoplastic resin stirring rod of the present invention, the molding shrinkage of the shaft portion is reduced by passing gas through the shaft portion in contact with the stirring blade, and at the same time, the stirring shrinkage blade is affected by the molding shrinkage of the shaft portion. It is considered that the deformation of the stirring blade could be effectively suppressed by playing a role of preventing the above. Therefore, in order to form a stirring rod having good flatness by using the gas assist molding method, it is desirable to introduce a hollow portion as wide as possible over the entire shaft portion in contact with the stirring blade.
【００１５】本発明の熱可塑性樹脂製撹拌棒は、中空部
の大きさは、撹拌翼の接続している軸中に形成された中
空部の軸方向の長さの合計が、撹拌翼の軸方向の長さに
対し、５０％から１００％にあることが好ましい。５０
％を下回ると、軸の成形収縮の影響を抑えることができ
ない。また撹拌翼の平面性は、中空部の軸方向の長さの
合計が増加すれば増加するほど向上する。しかしながら
中空部の軸方向の長さの合計の、撹拌翼の軸方向の長さ
に対する割合が９０％を越えると、成形中に成形品がキ
ャビティ−内で破裂し製品の得られない割合が多くな
り、実用上問題になる。したがって中空部の軸方向の長
さの合計の、撹拌翼の軸方向の長さに対する割合が７０
％以上９０％以下の範囲である時、撹拌翼の平面性及び
成形性を考えた上で更に好適である。本発明の熱可塑性
樹脂製撹拌棒は、寸法精度が良好であり、機構部品とし
て、一般機械、精密機械、電気・電子等の各分野に有用
である。In the thermoplastic resin stirring rod of the present invention, the size of the hollow portion is such that the total axial length of the hollow portion formed in the shaft to which the stirring blade is connected is the shaft of the stirring blade. It is preferably 50% to 100% of the length in the direction. Fifty
If it is less than%, the effect of the molding shrinkage of the shaft cannot be suppressed. Further, the planarity of the stirring blade is improved as the total axial length of the hollow portion is increased. However, if the ratio of the total axial length of the hollow portion to the axial length of the stirring blade exceeds 90%, the molded product bursts in the cavity during molding, and the product cannot be obtained in many cases. It becomes a problem in practice. Therefore, the ratio of the total axial length of the hollow portion to the axial length of the stirring blade is 70%.
% Or more and 90% or less is more preferable considering the flatness and moldability of the stirring blade. INDUSTRIAL APPLICABILITY The thermoplastic resin stirring rod of the present invention has good dimensional accuracy and is useful as a mechanical component in various fields such as general machinery, precision machinery, and electric / electronics.
【００１６】[0016]
【実施例】以下に実施例を挙げて本発明を更に詳細に説
明するが、これは本発明を限定するものではない。な
お、撹拌翼の接続している軸部分中に形成された中空部
の軸方向の長さｘの合計の、撹拌翼の軸方向の長さｙに
対する割合ｚは図１の記号ｘ1 、ｘ2 、ｘ3を用いる
と、以下の式（１）で表わされる。 ｚ＝（ｘ1 ＋ｘ2 ＋ｘ3 ）／ｙ×１００（％） ………（１）The present invention will be described in more detail with reference to the following examples, which should not be construed as limiting the present invention. The ratio z of the total axial length x of the hollow portion formed in the shaft portion to which the stirring blade is connected to the axial length y of the stirring blade is represented by symbols x 1 and x in FIG. If 2 and x 3 are used, they are expressed by the following equation (1). z = (x 1 + x 2 + x 3 ) / y × 100 (%) ……… (1)
【００１７】[0017]
【実施例１】図３に示した寸法で、図１に示した、基本
的に、軸、撹拌翼の２つの部分より構成されている熱可
塑性樹脂製撹拌棒を成形した。熱可塑性樹脂としてはポ
リアセタ−ル樹脂（旭化成工業（株）製 商標 テナッ
クーＣ ４５２０）を用いて、金型温度は４０℃、シリ
ンダ−設定温度は２００℃でガスアシスト成形を行っ
た。さらに樹脂の計量値はショ−トショットとなる値を
用いた。Example 1 A stirring rod made of a thermoplastic resin having the dimensions shown in FIG. 3 and basically shown in FIG. 1 and composed of two parts of a shaft and a stirring blade was molded. As the thermoplastic resin, a polyacetal resin (Tenac-C 4520 manufactured by Asahi Kasei Corporation) was used, and gas assist molding was performed at a mold temperature of 40 ° C. and a cylinder preset temperature of 200 ° C. Furthermore, the measured value of the resin was a value that was short shot.
【００１８】樹脂中に注入するガス体には窒素ガスを用
い、ガス注入口はシリンダ−のノズル部に設けた。この
時シリンダ−へのガスの侵入（金型と反対方向への侵
入）を防止する目的でガス注入口のスクリュ−側（ホッ
パ−側）にシャットオフ弁を設けた。ガス注入装置に窒
素ガスを導入し、６０ｋｇ／ｃｍ2 に昇圧してアキュム
レ−タ−にたくわえ、樹脂射出後に配管を通して樹脂中
に注入した。ガス体は、ノズルからスプル−、ランナ−
を通って撹拌棒のキャビティ−中に導入された。この時
の条件はガス圧入遅延時間（樹脂の射出後ガスを注入す
るまでの時間）を０．８秒、ガス圧入時間（ガス注入を
行う時間）を１秒、圧力保持時間（ガス注入を止めガス
系を閉じた状態に保持する時間とガス圧入時間をたした
時間）を１０秒とした。型開きは圧入保持時間終了から
４０秒後に行い、成形品を取り出した。Nitrogen gas was used as the gas body to be injected into the resin, and the gas injection port was provided in the nozzle portion of the cylinder. At this time, a shut-off valve was provided on the screw side (hopper side) of the gas inlet in order to prevent gas from entering the cylinder (in the direction opposite to the mold). Nitrogen gas was introduced into the gas injection device, the pressure was raised to 60 kg / cm 2 and stored in an accumulator, and after the resin was injected, it was injected into the resin through a pipe. The gas body is sprue from the nozzle, runner
Was introduced into the cavity of the stir bar. The conditions at this time were as follows: gas injection delay time (time from injection of resin until gas injection) 0.8 seconds, gas injection time (gas injection time) 1 second, pressure holding time (stop gas injection) The time for maintaining the gas system in a closed state and the time for adding the gas pressure was 10 seconds. Mold opening was performed 40 seconds after the press-fitting holding time was completed, and the molded product was taken out.
【００１９】上記の方法により中空構造を持つ成形品が
得られた。３点ゲ−トのため中空部は３つ形成されてい
る。図１に示した中空部の様態、撹拌翼の接続している
軸部分中に形成された中空部の軸方向の長さの合計の、
撹拌翼の軸方向の長さに対する割合ｚは９０％であっ
た。撹拌翼の平面性の検討は、以下の様な手順で行っ
た。まず３次元測定機を用いて図２に示す点Ａから点Ｆ
までの６点の空間座標を測定した。次に点Ａ、点Ｂ、点
Ｆを含有する平面を算出して基準面とし、その基準面か
ら点Ｃ、点Ｄ、点Ｅまでの距離をそれぞれ計算してそれ
らの値をこの撹拌翼の平面性の目安とした。従ってこの
平面性の目安値が小さい程、平面性が良好であると言え
る。得られた結果を表１に示した。A molded product having a hollow structure was obtained by the above method. Since it is a three-point gate, three hollow portions are formed. The state of the hollow portion shown in FIG. 1, the total axial length of the hollow portion formed in the shaft portion to which the stirring blade is connected,
The ratio z to the axial length of the stirring blade was 90%. The examination of the flatness of the stirring blade was performed by the following procedure. First, using a three-dimensional measuring machine, points A to F shown in FIG.
The spatial coordinates of 6 points up to were measured. Next, a plane containing points A, B, and F is calculated as a reference plane, and the distances from the reference plane to points C, D, and E are calculated, and those values are calculated for these stirring blades. It was used as a guide for flatness. Therefore, it can be said that the smaller the guideline value of the flatness, the better the flatness. The obtained results are shown in Table 1.
【００２０】[0020]
【実施例２】ｚが７０％となるように成形条件を変更し
た以外は、実施例１と同様にして同じ金型と熱可塑性樹
脂を用い、ガスアシスト成形を行った。実施例１と同様
の方法にて撹拌翼の平面性の検討を行い、結果を表１に
示した。Example 2 Gas-assisted molding was performed using the same mold and thermoplastic resin as in Example 1 except that the molding conditions were changed so that z was 70%. The planarity of the stirring blade was examined in the same manner as in Example 1, and the results are shown in Table 1.
【００２１】[0021]
【実施例３】ｚが５０％となるように成形条件を変更し
た以外は、実施例１と同様にして同じ金型と熱可塑性樹
脂を用い、ガスアシスト成形を行った。実施例１と同様
の方法にて撹拌翼の平面性の検討を行い、結果を表１に
示した。Example 3 Gas-assisted molding was performed using the same mold and thermoplastic resin as in Example 1, except that the molding conditions were changed so that z was 50%. The planarity of the stirring blade was examined in the same manner as in Example 1, and the results are shown in Table 1.
【００２２】[0022]
【実施例４】ｚが４０％となるように成形条件を変更し
た以外は、実施例１と同様にして同じ金型と熱可塑性樹
脂を用い、ガスアシスト成形を行った。実施例１と同様
の方法にて撹拌翼の平面性の検討を行い、結果を表１に
示した。Example 4 Gas-assisted molding was carried out using the same mold and thermoplastic resin as in Example 1 except that the molding conditions were changed so that z was 40%. The planarity of the stirring blade was examined in the same manner as in Example 1, and the results are shown in Table 1.
【００２３】[0023]
【実施例５】ｚが２０％となるように成形条件を変更し
た以外は、実施例１と同様にして同じ金型と熱可塑性樹
脂を用い、ガスアシスト成形を行った。実施例１と同様
の方法にて撹拌翼の平面性の検討を行い、結果を表１に
示した。Example 5 Gas-assisted molding was performed using the same mold and thermoplastic resin as in Example 1 except that the molding conditions were changed so that z was 20%. The planarity of the stirring blade was examined in the same manner as in Example 1, and the results are shown in Table 1.
【００２４】[0024]
【比較例１】実施例１と同様の金型と熱可塑性樹脂を用
い、ガス体の注入は行わず、樹脂射出、樹脂保圧、冷却
といった通常の射出成形を行った。シリンダ−設定温
度、金型温度等は実施例１と同様にして、保圧は１８０
ｋｇｆ／ ｃｍ2 、保圧時間は１０秒、冷却時間は４０
秒とした。COMPARATIVE EXAMPLE 1 Using the same mold and thermoplastic resin as in Example 1, ordinary injection molding such as resin injection, resin pressure holding and cooling was performed without injecting a gas. The cylinder-set temperature, mold temperature, etc. are the same as in Example 1, and the holding pressure is 180.
kgf / cm 2 , holding time is 10 seconds, cooling time is 40
Seconds
【００２５】得られた結果を表１に示した。表１にに示
すように、軸部分に形成された中空部の軸方向の長さの
合計の、撹拌翼の軸方向の長さに対する割合ｚの値が小
さいと撹拌翼の平面性の向上に対する効果は少なく、ま
たｚの値が大きすぎるとガスアシスト成形中キャビティ
−内でガス破れを生じてしまうが、Ｚの値が５０〜１０
０％のものは平面性が優れ、更には７０〜９０％のもの
が特に平面性に優れる好適なものでである。The results obtained are shown in Table 1. As shown in Table 1, when the value of the ratio z of the total axial length of the hollow portions formed in the shaft portion to the axial length of the stirring blade is small, the flatness of the stirring blade is improved. The effect is small, and if the value of z is too large, gas breakage occurs in the cavity during gas assist molding, but the value of Z is 50 to 10
Those having 0% are excellent in flatness, and those having 70 to 90% are particularly preferable because they are excellent in flatness.
【００２６】[0026]
【表１】 [Table 1]
【００２７】[0027]
【発明の効果】本発明の熱可塑性樹脂製撹拌棒は、従来
なかった、一回の成形で得られた一体成形のもので、撹
拌翼の平面性が優れた、安価なものである。The stirring bar made of thermoplastic resin of the present invention is an integrally molded article obtained by one-time molding, which has never been done before, and is excellent in the flatness of the stirring blade and is inexpensive.
【図１】本発明の、実施例１で得られた熱可塑性樹脂製
撹拌棒の一例を示した斜視図。FIG. 1 is a perspective view showing an example of a stirring rod made of a thermoplastic resin obtained in Example 1 of the present invention.
【図２】本発明の、実施例１で得られた熱可塑性樹脂製
撹拌棒上で、３次元測定機で空間座標を測定した箇所を
示す斜視図。FIG. 2 is a perspective view showing a portion where the spatial coordinates are measured by a three-dimensional measuring machine on the thermoplastic resin stirring rod obtained in Example 1 of the present invention.
【図３】本発明の、実施例１で得られたの熱可塑性樹脂
製撹拌棒の寸法（単位：ｍｍ）を示す正面図（イ）、側
面図（ロ）。FIG. 3 is a front view (a) and a side view (b) showing the dimensions (unit: mm) of the thermoplastic resin stirring rod obtained in Example 1 of the present invention.
【符号の説明】 １…軸 ２…撹拌翼 ３…中空部 ｘ1 、ｘ2 、ｘ3 …撹拌棒中に存在する中空部のそれぞ
れの長さ ｙ…撹拌翼の軸方向の長さ Ｇ1 、Ｇ2 、Ｇ3 …ゲート Ａ、Ｂ、Ｃ、Ｄ、Ｅ、Ｆ…３次元測定機で空間座標を測
定した箇所[Explanation of Codes] 1 ... Shaft 2 ... Stirring blade 3 ... Hollow portion x 1 , x 2 , x 3 ... Length of each hollow portion present in the stirring rod y ... Length of stirring blade in the axial direction G 1 , G 2 , G 3 ... Gates A, B, C, D, E, F ... Locations where spatial coordinates are measured by a three-dimensional measuring machine
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ２９Ｌ 31:08 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location B29L 31:08
Claims (1)
該撹拌棒が軸と撹拌翼とからなり、かつ該軸が熱可塑性
樹脂が満たされていない中空部を有し、しかもガスアシ
スト成形法により一体成形で射出成形されたことを特徴
とする熱可塑性樹脂製撹拌棒。1. A stir bar comprising a thermoplastic resin, comprising:
A thermoplastic resin characterized in that the stirring rod is composed of a shaft and a stirring blade, the shaft has a hollow portion not filled with a thermoplastic resin, and is integrally molded by gas-assist molding. Resin stirring rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5320237A JP2796238B2 (en) | 1993-12-20 | 1993-12-20 | Gas-assisted molding of a stirring rod made of polyacetal resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5320237A JP2796238B2 (en) | 1993-12-20 | 1993-12-20 | Gas-assisted molding of a stirring rod made of polyacetal resin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07171910A true JPH07171910A (en) | 1995-07-11 |
| JP2796238B2 JP2796238B2 (en) | 1998-09-10 |
Family
ID=18119259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5320237A Expired - Lifetime JP2796238B2 (en) | 1993-12-20 | 1993-12-20 | Gas-assisted molding of a stirring rod made of polyacetal resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2796238B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008212905A (en) * | 2007-03-08 | 2008-09-18 | Yayoi Chemical Industry Co Ltd | Stirrer for mixer and its manufacturing method |
| JP2009293852A (en) * | 2008-06-05 | 2009-12-17 | Fuji Electric Retail Systems Co Ltd | Ice storage type beverage cooling device |
| JP2016540638A (en) * | 2013-12-17 | 2016-12-28 | バイエル クロップサイエンス エルピーＢａｙｅｒ Ｃｒｏｐｓｃｉｅｎｃｅ Ｌｐ | Mixing system, method and apparatus with deployable impeller |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05208430A (en) * | 1991-12-02 | 1993-08-20 | Mitsubishi Gas Chem Co Inc | Injection-molded product superior in quality of external appearance |
-
1993
- 1993-12-20 JP JP5320237A patent/JP2796238B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05208430A (en) * | 1991-12-02 | 1993-08-20 | Mitsubishi Gas Chem Co Inc | Injection-molded product superior in quality of external appearance |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008212905A (en) * | 2007-03-08 | 2008-09-18 | Yayoi Chemical Industry Co Ltd | Stirrer for mixer and its manufacturing method |
| JP2009293852A (en) * | 2008-06-05 | 2009-12-17 | Fuji Electric Retail Systems Co Ltd | Ice storage type beverage cooling device |
| JP2016540638A (en) * | 2013-12-17 | 2016-12-28 | バイエル クロップサイエンス エルピーＢａｙｅｒ Ｃｒｏｐｓｃｉｅｎｃｅ Ｌｐ | Mixing system, method and apparatus with deployable impeller |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2796238B2 (en) | 1998-09-10 |
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