JPH0619318B2 - Viscosity measurement method - Google Patents
Viscosity measurement methodInfo
- Publication number
- JPH0619318B2 JPH0619318B2 JP24648985A JP24648985A JPH0619318B2 JP H0619318 B2 JPH0619318 B2 JP H0619318B2 JP 24648985 A JP24648985 A JP 24648985A JP 24648985 A JP24648985 A JP 24648985A JP H0619318 B2 JPH0619318 B2 JP H0619318B2
- Authority
- JP
- Japan
- Prior art keywords
- viscosity
- fluid
- shear rate
- metering pump
- throttle
- 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
- Measuring Volume Flow (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、高分子化合物などの粘度計測方法に関する。TECHNICAL FIELD The present invention relates to a method for measuring viscosity of polymer compounds and the like.
背景技術 ニュートン流体は剪断力が加わっても流体の粘度が変化
しないが、非ニュートン流体は剪断力が加わると流体の
粘度が変化する。一方、従来のライン用（生産ラインに
組み込まれた）粘度計は非ニュートン流体の粘度計測に
も使われているが、測定条件が固定されて１点の粘度し
か計測されない。即ち、生産ラインで行われる高分子化
合物などの粘度計測方法は従来、定量ポンプによって測
定すべき流体の一定流量を絞りに供給し、この流量を一
定としたままで絞りの差圧と流量とに基づいて粘度を測
定している。BACKGROUND ART The viscosity of a Newtonian fluid does not change even when a shearing force is applied, but the viscosity of a non-Newtonian fluid changes when a shearing force is applied. On the other hand, a conventional viscometer for a line (built into a production line) is also used for measuring the viscosity of a non-Newtonian fluid, but the measurement conditions are fixed and only one point of viscosity can be measured. That is, in the conventional method for measuring the viscosity of a polymer compound or the like on a production line, a constant flow rate of a fluid to be measured is supplied to a throttle by a metering pump, and the pressure difference and flow rate of the throttle are kept constant. Based on this, the viscosity is measured.
発明が解決しようとする問題点 非ニュートン流体の場合は、剪断速度が一点を通る粘度
曲線は無数に描くことができる。従って、一点の粘度で
は表現があいまいで、その流体の性質を知ることができ
ない。使用される粘度は剪断速度がどの速度の時のもの
か、調べないと分からない。即ち、例えば、ポリスチレ
ン樹脂の生産ラインでの非ニュートン流体の場合、ある
１点の剪断速度を計測してもその流体の粘度の全てを知
り得ず、その１点を通る種々の粘度カーブが剪断速度に
より描かれる。つまり、様々な粘度の樹脂が生産されて
いることになる。Problems to be Solved by the Invention In the case of a non-Newtonian fluid, an infinite number of viscosity curves can be drawn where the shear rate passes through one point. Therefore, the expression at one point is ambiguous, and the properties of the fluid cannot be known. The viscosity used cannot be known without knowing what the shear rate is. That is, for example, in the case of a non-Newtonian fluid in a polystyrene resin production line, even if the shear rate at a certain point is measured, it is not possible to know all the viscosities of the fluid, and various viscosity curves passing through that point are sheared. Pictured by speed. That is, resins with various viscosities are produced.
本発明は上記問題点を解決し、非ニュートン流体をその
流動状態のまま、その略静止状態の粘度を合理的正確さ
で推定する方法を提供することを目的とする。It is an object of the present invention to solve the above problems and provide a method for estimating the viscosity of a non-Newtonian fluid in its fluid state in a substantially stationary state with reasonable accuracy.
問題点を解決するための手段 上記目的を達成するための、本発明の構成は次の通りと
する。すなわち、粘度を計測すべき流体を定量ポンプに
よって絞りに圧送し、定量ポンプの回転速度を変化して
絞りの上流側と下流側との圧力差を検出し、回転速度と
圧力差とに対応して演算されるみかけ粘度にもとづい
て、剪断速度が零近傍であるときの粘度を求めることで
ある。Means for Solving the Problems To achieve the above object, the structure of the present invention is as follows. That is, the fluid whose viscosity is to be measured is pressure-fed to the throttle by the metering pump, the rotation speed of the metering pump is changed to detect the pressure difference between the upstream side and the downstream side of the throttle, and the rotation speed and the pressure difference are detected. That is, the viscosity when the shear rate is near zero is calculated based on the apparent viscosity calculated as follows.
実施例 以下、本発明を図面に示す実施例にもとづいて説明す
る。Examples Hereinafter, the present invention will be described based on Examples shown in the drawings.
第１図は本発明の一実施例を示す断面図である。該図に
おいて、反応炉１の下部に主ポンプ２がフランジ結合さ
れている。反応炉１内でたとえば重合反応された高分子
化合物である流体が供給される。主ポンプ２はハウジン
グ３内のポンプ室４に収納されている一対の歯車５を備
える歯車ポンプである。FIG. 1 is a sectional view showing an embodiment of the present invention. In the figure, the main pump 2 is flange-connected to the lower part of the reactor 1. In the reaction furnace 1, for example, a fluid, which is a polymer compound obtained by polymerization reaction, is supplied. The main pump 2 is a gear pump including a pair of gears 5 housed in a pump chamber 4 inside a housing 3.
一方の歯車は駆動軸６を介し、駆動源７によつて一定速
度で回転されている。One gear is rotated at a constant speed by a drive source 7 via a drive shaft 6.
そして、これにより流体は吸込口８から吐出口９に向つ
て前記歯車５の回転速度に対応した流量で供給される。As a result, the fluid is supplied from the suction port 8 toward the discharge port 9 at a flow rate corresponding to the rotation speed of the gear 5.
この流体の粘度を測定するために駆動軸６に対し軸継手
１０によつて連結された定量ポンプ１１が設けられる。
この定量ポンプ１１は一対の歯車１２を有し、そのハウ
ジング１３は前記ハウジング３に固定されている。一方
の歯車１２は駆動軸６に軸継手１０を介して連結されて
いる。そして、この定量ポンプ１１の吸入口１４は、主
ポンプ２の吐出口９に流路１５を介して接続されてい
る。定量ポンプ１１の吐出口１６は主ポンプの吸込口８
の流路１７を介して接続されている。この流路１７には
チヨークである絞り１８が介在されている。絞り１８の
上流側すなわち定量ポンプ１１の吐出口１６と絞り１８
との間には圧力検出器１９が設けられており、この圧力
検出器は絞り１８の上流側における流体の圧力を検出す
る。In order to measure the viscosity of this fluid, a metering pump 11 connected to the drive shaft 6 by a shaft coupling 10 is provided.
The metering pump 11 has a pair of gears 12, and its housing 13 is fixed to the housing 3. One gear 12 is connected to the drive shaft 6 via a shaft coupling 10. The suction port 14 of the metering pump 11 is connected to the discharge port 9 of the main pump 2 via the flow path 15. The discharge port 16 of the metering pump 11 is the suction port 8 of the main pump.
Are connected via the flow path 17. A diaphragm 18, which is a yoke, is interposed in the flow path 17. The upstream side of the throttle 18, that is, the discharge port 16 and the throttle 18 of the metering pump 11.
A pressure detector 19 is provided between and, and this pressure detector detects the pressure of the fluid on the upstream side of the throttle 18.
この定量ポンプ１１の吐出口１６における圧力は、低真
空又は大気に近い吸込口における圧力に比べて充分に高
く、従つて、圧力検出器１９の検出圧力は絞り１８の上
流側と下流側との圧力差に等しいとみなすことができ
る。圧力検出器１９は絞り１８の上流側で、かつ、絞り
１８に近接して設けられており、これにより前記圧力差
の測定精度を向上させることができる。The pressure at the discharge port 16 of the metering pump 11 is sufficiently higher than the pressure at the suction port close to a low vacuum or the atmosphere, and therefore the pressure detected by the pressure detector 19 is between the upstream side and the downstream side of the throttle 18. It can be regarded as equal to the pressure difference. The pressure detector 19 is provided on the upstream side of the restrictor 18 and in the vicinity of the restrictor 18, whereby the accuracy of measuring the pressure difference can be improved.
駆動軸６には回転速度検出器２０が設けられる。圧力検
出器１９と回転速度検出器２０との出力はマイクロコン
ピユータなどの処理回路２１に与えられる。A rotation speed detector 20 is provided on the drive shaft 6. The outputs of the pressure detector 19 and the rotation speed detector 20 are given to a processing circuit 21 such as a microcomputer.
以上の機構において次に使用態様を説明する。ハーゲン
ポアズイユの式として知られる下記(１)式によつて粘度
ηを求めることができる。Next, the usage mode of the above mechanism will be described. The viscosity η can be calculated by the following equation (1) known as Hagen-Poiseuille's equation.
ただし、(１)式において、絞り１８は、直円筒状であつ
てその半径をＲとし、軸線方向の長さＬ、圧力検出器１
９により絞り１８の上流側と下流側との圧力差をＰ、定
量ポンプ１１による駆動軸の回転速度に正比例した流量
をｑとする。また、ハーゲンポアズイユの式は前記圧力
差Ｐと、回転速度検出器２０によつて測定される回転数
Ｎの式に変形される。 However, in the formula (1), the diaphragm 18 is a right cylinder, its radius is R, its axial length L, and the pressure detector 1
The pressure difference between the upstream side and the downstream side of the throttle 18 is denoted by 9 and the flow rate that is directly proportional to the rotational speed of the drive shaft driven by the metering pump 11 is denoted by q. Further, the Hagen-Poiseuille equation is transformed into the equation of the pressure difference P and the rotation speed N measured by the rotation speed detector 20.
以上の式を用い駆動軸６を駆動源７によつて駆動し、定
格回転速度における粘度と、定格回転数よりも低い回転
速度における粘度とを演算して絞り１８内の流体の剪断
速度とみかけの粘度とを演算する。この剪断速度は、回
転速度検出器２０によつて検出される回転速度と正比例
する。The drive shaft 6 is driven by the drive source 7 using the above formula, and the viscosity at the rated rotation speed and the viscosity at the rotation speed lower than the rated rotation speed are calculated to obtain the apparent shear speed of the fluid in the throttle 18. And the viscosity of. This shear rate is directly proportional to the rotational speed detected by the rotational speed detector 20.
ここで剪断速度ＤＷは(２)式で求められる。Here, the shear rate DW is obtained by the equation (2).
ただし(２)式中、Ｋ2は係数である。 However, in the equation (2), K 2 is a coefficient.
［実施例］ 試料としてポリエステル樹脂を２８０℃に加熱し、上記
機構にもとづいて実験を行ない、第２図に示す剪断速度
とみかけ粘度による両対数目盛のグラフを得た。[Example] A polyester resin was heated to 280 ° C as a sample, and an experiment was conducted based on the above mechanism to obtain a graph on a logarithmic scale based on the shear rate and the apparent viscosity shown in Fig. 2.
各実験結果は直線(実線)ｌ１上にあり、その直線ｌ１を
剪断速度の小さい方向に延長して破線で示すｌ1aとし
た。The results of each experiment are on a straight line (solid line) l 1 , and the straight line l 1 is extended to a direction in which the shear rate is small to be l 1a shown by a broken line.
このグラフより、たとえば、剪断速度(ＤＷ)が１sec-1
のときのみかけ粘度として２６９５poiseが求められ
た。From this graph, for example, the shear rate (DW) is 1 sec -1
At that time, an apparent viscosity of 2695 poise was obtained.
以上の実施例では、剪断速度が１sec-1のときにおける
みかけ粘度を求めたが、他の実施例として、ずり速度が
さらに小さい値におけるみかけ粘度を求めれば略静止状
態の粘度を正確に求めることができる。In the above examples, the apparent viscosity was obtained when the shear rate was 1 sec -1 , but as another example, if the apparent viscosity at a smaller shear rate was obtained, the viscosity in a substantially stationary state could be accurately obtained. You can
定量ポンプ１１は歯車ポンプのほか回転速度に比例した
流量の流体を吐出する他のポンプを用いてもよい。The metering pump 11 may be a gear pump or another pump that discharges a fluid at a flow rate proportional to the rotation speed.
定量ポンプ１１は主ポンプ２と軸継手１０により連結さ
れて構成されているが、他の実施例として、定量ポンプ
１１を、主ポンプ２のための駆動源７と異なる駆動源に
よつて駆動されるようにしてもよい。The metering pump 11 is configured by being connected to the main pump 2 by the shaft coupling 10, but as another embodiment, the metering pump 11 is driven by a driving source different from the driving source 7 for the main pump 2. You may do it.
発明の効果 本発明の構成により、複数の剪断速度での見かけ粘度を
測定することにより、グラフでの外挿線を描き、非ニュ
ートン流体をその流動状態のまま、その略静止状態の粘
度を合理的正確さで求められることとなった。Effects of the Invention With the configuration of the present invention, by measuring apparent viscosities at a plurality of shear rates, an extrapolation line in a graph is drawn, and a non-Newtonian fluid is kept in its flowing state, and its viscosity in a substantially stationary state is rationalized. It became necessary to be accurate.
前記の略静止状態の粘度はほぼ一定であるので、非ニュ
ートン流体のこの時の粘度が、ニュートン流体の一定粘
度に相当する粘度としてとらまえることができる。この
ため、これまでにニュートン流体で使用される粘度計、
例えばＢ型粘度計での粘度とほぼ等しい関係になる。Since the viscosity in the substantially stationary state is almost constant, the viscosity of the non-Newtonian fluid at this time can be regarded as the viscosity corresponding to the constant viscosity of the Newtonian fluid. For this reason, the viscometers used in Newtonian fluids so far,
For example, the relationship is approximately equal to the viscosity of a B type viscometer.
サンプルとして抜き出して測定物を測定してきた粘度の
管理を、ラインから取り出して調べる事なく、ラインの
流動状態のまま管理できる。It is possible to control the viscosity of the sample, which has been measured as a sample, without measuring the viscosity of the line, without taking it out of the line for inspection.
また、粘度曲線を求めることで材料（製品）の性質の変
化を知ることができる。Further, by obtaining the viscosity curve, it is possible to know the change in the properties of the material (product).
第１図は本発明の一実施例を示す断面図、第２図は粘度
演算線図である。 ２……主ポンプ、７……駆動源、８……吸込口、９……
吐出口、１１……定量ポンプ、１８……絞り、１９……
圧力検出器、２０……回転速度検出器FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a viscosity calculation diagram. 2 ... Main pump, 7 ... Drive source, 8 ... Suction port, 9 ...
Discharge port, 11 ... metering pump, 18 ... throttle, 19 ...
Pressure detector, 20 ... Rotation speed detector
Claims (1)
て絞りに圧送し、 前記定量ポンプの回転速度を変化させて、流体の剪断速
度が１０／ｓｅｃ以上の範囲における絞りの上流側と下
流側との圧力差を検出し、 回転速度と圧力差とに対応して演算されるみかけ粘度お
よび回転速度に対応して演算される剪断速度にもとづ
き、複数の剪断速度でのみかけ粘度を測定し、これらを
もとに外挿法で剪断速度が１／ｓｅｃ近傍またはそれよ
りさらに小さい値であるときの粘度を求めることを特徴
とする粘度計測方法。1. A fluid whose viscosity is to be measured is pressure-fed to a throttle by a metering pump, the rotational speed of the metering pump is changed, and the upstream and downstream sides of the throttling in the range where the shear rate of the fluid is 10 / sec or more. Based on the apparent viscosity calculated corresponding to the rotational speed and the pressure difference and the shear rate calculated corresponding to the rotational speed, the apparent viscosity is measured at multiple shear rates, A viscosity measuring method characterized by obtaining the viscosity when the shear rate is in the vicinity of 1 / sec or a value smaller than 1 / sec by extrapolation based on these.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24648985A JPH0619318B2 (en) | 1985-11-02 | 1985-11-02 | Viscosity measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24648985A JPH0619318B2 (en) | 1985-11-02 | 1985-11-02 | Viscosity measurement method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62106343A JPS62106343A (en) | 1987-05-16 |
| JPH0619318B2 true JPH0619318B2 (en) | 1994-03-16 |
Family
ID=17149158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24648985A Expired - Fee Related JPH0619318B2 (en) | 1985-11-02 | 1985-11-02 | Viscosity measurement method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0619318B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01292233A (en) * | 1988-05-19 | 1989-11-24 | Plast Kogaku Kenkyusho:Kk | Viscometer |
| JPH0255933A (en) * | 1988-08-19 | 1990-02-26 | Plast Kogaku Kenkyusho:Kk | Viscometer |
-
1985
- 1985-11-02 JP JP24648985A patent/JPH0619318B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62106343A (en) | 1987-05-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4077251A (en) | Viscosity measuring device and method | |
| US3138950A (en) | Apparatus for concurrent measurement of polymer melt viscosities at high and low shear rates | |
| EP0769690B1 (en) | On-line rheological measurements | |
| Fortuna et al. | The influence of drag-reducing polymers on turbulence in the viscous sublayer | |
| US2650256A (en) | Automatic electrometric titration apparatus | |
| US5347852A (en) | On-line rheological measurements for process control | |
| KR960016167B1 (en) | In-line polymzer melt | |
| US5708197A (en) | Helical barrel rheometer | |
| EP0560826B1 (en) | Rheometer | |
| Roughton et al. | Photoelectric methods of measuring the velocity of rapid reactions I-General principles and controls | |
| US3229506A (en) | Viscosity measuring instrument | |
| US2817231A (en) | Viscosimeter | |
| DE10359726A1 (en) | quantity measurement | |
| JPH0619318B2 (en) | Viscosity measurement method | |
| US3192017A (en) | Continuous recording titrator | |
| US4571989A (en) | Method and apparatus for measuring rheological properties of fluid | |
| US3292423A (en) | Method of and apparatus for measuring viscosity | |
| CN111735510A (en) | Device and method for online detection of slurry solid content based on series connection of mass flow controllers | |
| US3008326A (en) | Apparatus for measuring viscosity | |
| US2652720A (en) | Method of and apparatus for determining total flow in a borehole | |
| US2869358A (en) | Apparatus for measuring viscosity | |
| Kalyon et al. | An adjustable gap in-line rheometer | |
| RU2000548C1 (en) | Flow meter | |
| US2294079A (en) | Viscosity measuring device | |
| Merrill | Pseudoplastic flow: Viscometry, correlations of shear stress vs. shear rate, and prediction of laminar flow in tubes |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |