國產毛細管流變儀制造商 實驗原料
熱塑性塑料如PE、PP、PS及其復合物粉料、粒料、條狀薄片或模壓塊料等；實驗前應根據材料類別和性質作相應處理，如干燥等。
當塑料熔體通過毛細管口模時，由安裝在毛細管口模處的壓力傳感器和熱電偶測試出熔體的壓力和溫度，微機記錄下熔體壓力和溫度數值。
流變性能的儀器一般稱為流變儀，有時又叫粘度計。在測定和研究塑料熔體流變性的各種儀器中，毛細管流變儀是一種常用的較為合適的試驗儀器，它具有多種功能和寬廣范圍的剪切速率容量。毛細管流變儀即可以測定塑料熔體在毛細管中的剪切應力和剪切速率的關系，又可以根據擠出物的直徑和外觀或在恒定應力下通過改變毛細管的長徑比來研究熔體的彈性和不穩定流動（包括熔體破裂）現象。從而測其加工行為，作為選擇復合物配方、尋求 成型工藝條件和控制產品質量的依據；或者為輔助成型模具和塑料機械設計提供基本數據。
國產毛細管流變儀制造商 毛細管流變儀可以測定高聚物的軟化點、熔點、流動點、粘度粘流活化能，熱固性材料的固化溫度等性能指標。這些數據對研究高聚物流變性能有重要的作用。
如果要尋找一臺精密的熔融指數儀，那么可以考慮使用毛細管流變儀。一般的熔融指數儀測量的只是剪切速率/黏度曲線上的一點，只能對材料的流動性或平均分子量進行的評估，而毛細管流變儀可以測定材料黏度隨溫度及壓力的變化。試驗時，溫度恒定，活塞以幾種不同的速率移動，這樣就能知道黏度與剪切速率和剪切力之間的關系。
數據處理
1、啟動操作應用軟件。
2、輸入實驗報告信息。
3、添加數據文件及輸入實驗參數,進行試驗操作。
4、篩選數據。查看篩選的數據，檢查數據的有效性和合理性。
5、顯示曲線，顯示數據。
6、試驗結束，打印保存數據及曲線。
7、關閉系統。
Experimental raw materials
Thermoplastic materials such as PE, PP, PS and their composite powders, granules, strip films or molded blocks; Before the experiment, corresponding treatments such as drying should be carried out according to the material category and properties.
When the plastic melt passes through the capillary die, the pressure and temperature of the melt are measured by pressure sensors and thermocouples installed at the capillary die, and the microcomputer records the values of the melt pressure and temperature.
The instrument for rheological properties is generally called a rheometer, sometimes also called a viscometer. Among various instruments for measuring and studying the rheological properties of plastic melts, capillary rheometer is a commonly used and suitable testing instrument, which has multiple functions and a wide range of shear rate capacity. The capillary rheometer can measure the relationship between shear stress and shear rate of plastic melt in the capillary tube, and can also study the elasticity and unstable flow (including melt fracture) of the melt by changing the aspect ratio of the capillary tube under constant stress or based on the diameter and appearance of the extruded material. Thus measuring its processing behavior as a basis for selecting composite formulations, seeking optimal molding process conditions, and controlling product quality; Or provide basic data for auxiliary molding molds and plastic machinery design.
Capillary rheometer can measure performance indicators such as softening point, melting point, flow point, viscosity, viscous flow activation energy, and curing temperature of thermosetting materials of polymers. These data play an important role in studying the rheological properties of polymers.
If you are looking for a precise melt index analyzer, you may consider using a capillary rheometer. A typical melt index meter only measures a point on the shear rate/viscosity curve and can only evaluate the flowability or average molecular weight of materials, while a capillary rheometer can measure the changes in material viscosity with temperature and pressure. During the experiment, the temperature remains constant and the piston moves at several different rates to determine the relationship between viscosity, shear rate, and shear force.
Data processing
1. Start operating the application software.
2. Enter experimental report information.
3. Add data files and input experimental parameters to perform experimental operations.
4. Filter data. View the filtered data and check its validity and rationality.
5. Display curves and data.
6. After the experiment is completed, print and save the data and curves.
7. Shut down the system.
試驗原理
毛細管流變儀測試的基本原理是：設定一個無限長的圓形毛細管中，塑料熔體在管中的流動為一種不可壓縮的粘性流體的穩定層流流動；由于流體具有粘性，它必然受到來自管壁與流體方向相反的作用力。通過粘滯阻力應與推動力相平衡等流體力學過程原理的推導，可得到管壁處的剪切應力和剪切速率與壓力、熔體流速的關系如下：
材料流經毛細管時的剪切應力為：
τ=R·⊿P/2L
（1）
其中 R—毛細管的內半徑，這里 R=0.635 mm
⊿P—材料流經毛細管的壓力差kg/cm2
L—毛細管的長度，例如選擇長徑比為30：1的毛細管，L=38.1mm
剪切速率為： 
=4Q/πR3
(2)
其中 Q—擠出流量cm3/s
由此，在溫度和毛細管長徑比（L/2R）一定的條件下，測定不同的壓力下塑料熔體通過毛細管的流動速率Q，由流動速率和毛細管兩端的壓力差⊿P，可計算出相應的剪切應力和剪切速率，將一組對應的τ和在對數座標紙上繪制流動曲線，即可求得非牛頓指數（n）和熔體的表觀粘度（ηa）；改變溫度或改變毛細管長徑比，則可得到代表粘度對溫度依賴性的粘流活化能；以及離模膨脹比等表征流變特性的物理參數。
毛細管流變儀是一種用于在高應力下測量剪切應力率的裝置。可以測定熱固性材料的流動性和固化速度，可繪制熱塑性材料的應力應變曲線、塑化曲線，測定軟化點、熔融點、流動點的溫度。測定高聚物熔體的粘度及粘流活化性，還能研究熔融紡絲的工藝條件。
用于測量高分子熔體在毛細管中的剪切應力和剪切速率的關系，直接觀察擠出物的外型，通過改變長徑比來研究熔體的彈性和不穩定性，測定聚合物的狀態變化等。對聚合物流變性能的研究，不僅可為加工提供 的工藝條件，為塑料機械設計參數提供數據，而且可在材料選擇、原料改性方面獲得有關結構和分子參數等有用的數據。模擬加工模式更多，剪切速率范圍更寬。
物料在電加熱的料桶里被加熱熔融，料桶的下部安裝有一定規格的毛細管口模（有不同直徑 0.25～2mm和不同長度的0.25～40mm），溫度穩定后，料桶上部的料桿在驅動馬達的帶動下以一定的速度或以一定規律變化的速度把物料從毛細管口模種擠出來。在擠出的過程中，可以測量出毛細管口模入口出的壓力，在結合已知的速度參數、口模和料桶參數、以及流變學模型，從而計算出在不同剪切速率下熔體的剪切粘度。
毛細管流變儀的系統組成
毛細管流變儀是一種基于塑化分析研究的材料流變性能測試設備，其突出的特點是可以在接近真實加工條件下，對材料的流變行為進行研究。毛細管流變儀主要由驅動系統、控溫系統、軟件系統和各種附件組成。
驅動系統
毛細管流變儀的驅動系統主要為各功能單元提供動力和控制功能，其腔體是一個圓柱形的塑化器，是流變儀的重要組成部分。在高分子材料的加工過程中，通常根據試驗材料對剪切強度的要求，選擇不同的口模。通過記錄物料在測試過程中的溫度、表觀切應力、粘度隨剪切速率的變化。可研究材料在加工過程中的分散性能、流動行為及熱穩定性等。并得到流變曲線。客觀呈現材料的加工塑化過程。
控溫系統
毛細管流變儀的控溫系統主要通過傳感器測量腔體的溫度值，并將其轉換為信號，再輸入溫度顯示調節儀表，與設定的信號相比較，經過運算后改變執行器輸出操作變量，從而改變國熱腔體的熱量，達到控制溫度的目的。當腔體內的溫度大于限定區間時，控溫系統自行下調溫度，當腔體的溫度小于此區間時，控溫系統自行上調溫度，以保障系統硬件設備和傳感器連接正常。
Experimental principle
The basic principle of capillary rheometer testing is to set an infinitely long circular capillary tube, and the flow of plastic melt in the tube is a stable laminar flow of an incompressible viscous fluid; Due to the viscosity of fluids, they are inevitably subjected to forces from the pipe wall that are opposite in direction to the fluid. By deriving the principles of fluid mechanics processes such as equilibrium between viscous resistance and driving force, the relationship between shear stress and shear rate at the pipe wall, pressure, and melt flow rate can be obtained as follows:
The shear stress of the material flowing through the capillary is:
τ=R·⊿P/2L
（1）
Among them, R - the inner radius of the capillary tube, here R=0.635 mm
Δ P - pressure difference of material flowing through capillary tube kg/cm2
L - the length of the capillary tube, for example, selecting a capillary tube with a length to diameter ratio of 30:1, L=38.1mm
Shear rate:=4Q/π R3
(2)
Where Q - extrusion flow rate cm3/s
Therefore, under the condition of constant temperature and capillary length to diameter ratio (L/2R), the flow rate Q of plastic melt through the capillary tube under different pressures can be measured. By calculating the corresponding shear stress and shear rate from the flow rate and the pressure difference Δ P at both ends of the capillary tube, a set of corresponding τ and can be plotted on logarithmic coordinate paper to obtain the non Newtonian index (n) and the apparent viscosity of the melt (η a); By changing the temperature or altering the aspect ratio of the capillary, the viscous flow activation energy representing the temperature dependence of viscosity can be obtained; And physical parameters that characterize rheological properties, such as the modulus expansion ratio.
A capillary rheometer is a device used to measure shear stress rate under high stress. It can measure the flowability and curing speed of thermosetting materials, draw stress-strain curves and plasticization curves of thermoplastic materials, and determine the temperature of softening point, melting point, and flow point. Measuring the viscosity and viscous flow activation of polymer melts, as well as studying the process conditions of melt spinning.
Used to measure the relationship between shear stress and shear rate of polymer melts in capillaries, directly observe the appearance of extruded materials, study the elasticity and instability of melts by changing the aspect ratio, and determine changes in the state of polymers. The study of polymer rheological properties can not only provide optimal processing conditions and data for plastic machinery design parameters, but also obtain useful data on structure and molecular parameters in material selection and raw material modification. There are more simulation processing modes and a wider range of shear rates.
The material is heated and melted in an electrically heated barrel, and a certain specification of capillary tube mouth mold (with different diameters of 0.25-2mm and lengths of 0.25-40mm) is installed at the lower part of the barrel. After the temperature stabilizes, the material rod at the upper part of the barrel is driven by a driving motor to extrude the material from the capillary tube mouth mold at a certain speed or at a certain regular speed. During the extrusion process, the pressure at the entrance of the capillary die can be measured, and the shear viscosity of the melt at different shear rates can be calculated by combining known velocity parameters, die and barrel parameters, and rheological models.
System composition of capillary rheometer
Capillary rheometer is a material rheological property testing equipment based on plasticization analysis research. Its outstanding feature is that it can study the rheological behavior of materials under close to real processing conditions. The capillary rheometer is mainly composed of a driving system, a temperature control system, a software system, and various accessories.
driving system
The driving system of the capillary rheometer mainly provides power and control functions for various functional units, and its chamber is a cylindrical plasticizer, which is an important component of the rheometer. In the processing of polymer materials, different molds are usually selected based on the shear strength requirements of the test material. By recording the changes in temperature, apparent shear stress, and viscosity of materials with shear rate during the testing process. Can study the dispersion performance, flow behavior, and thermal stability of materials during processing. And obtain the rheological curve. Objectively present the processing and plasticization process of materials.
Temperature control system
The temperature control system of a capillary rheometer mainly measures the temperature value of the chamber through sensors, converts it into a signal, and then inputs it into a temperature display and adjustment instrument. Compared with the set signal, after calculation, the output operating variable of the actuator is changed, thereby changing the heat output of the national heat chamber and achieving the purpose of temperature control. When the temperature inside the chamber is greater than the limited range, the temperature control system will automatically lower the temperature. When the temperature inside the chamber is less than this range, the temperature control system will automatically increase the temperature to ensure the normal connection of the system hardware equipment and sensors.
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