一 產(chǎn)品簡介
WJ-400A熔體流動速率儀是試驗方法測定熱塑性塑料在高溫下流動性能的儀器，我司熔體流動速率儀采用美國微電腦控制，中文操作界面，自動試驗結(jié)果；用于聚乙烯(PE)、聚丙烯(PP)、聚甲醛（POM）、聚苯乙烯（PS）、ABS 塑料、聚碳酸酯(PC)等在高溫下熔體流動速率的測定 可以測ＭFR值，手動自動兩種切料方式。具有操作簡便，控制精度高等優(yōu)點。
二、符合標準：
該儀器執(zhí)行JB/T5456標準要求，適用GB/T3682、ASTM D1238、ISO1133等標準。
ASTMD 1238-13熱塑性塑料熔體流動速率的標準測試方法用擠壓式塑性計
ISO1133-1-2：2011熱塑性塑料熔體質(zhì)量流動速率(MFR)和熔體體積流動速率(MVR)的測定
GB/T3682熱塑性塑料熔體質(zhì)量流動速率和熔體體積流動速率的測定
GBT 3682.1-2018 塑料 熱塑性塑料熔體質(zhì)量流動速率(MFR)和熔體體積流動速率(MVR)的測定 第1部分：標準方法
GBT 3682.2-2018 塑料 熱塑性塑料熔體質(zhì)量流動速率(MFR)和熔體體積流動速率(MVR)的測定 第2部分：對時間-溫度歷史和(或)濕度敏感的材料的試驗方法
三、工作原理：
熔體流動速率儀是一種擠出型塑料計。它是在規(guī)定溫度條件下，用高溫加熱爐使被測物達到熔融狀態(tài)。這種熔融狀態(tài)的被測物，在規(guī)定的砝碼的負荷重力下通過一定直徑的小孔進行擠出試驗。在工業(yè)企業(yè)的塑料生產(chǎn)中及科研單位的研究中，經(jīng)常用“熔體（質(zhì)量）流動速率”來表示高分子材料在熔融狀態(tài)下的流動性、粘度等物理性能。
四、產(chǎn)品優(yōu)勢：
制作工藝
微電腦程序控制
電腦PID分段控溫，溫度精密度高
溫度自動修正
自動切料
五、技術(shù)性能：
1、顯示方式：液晶屏。
2、測量方式：質(zhì)量法（MFR）。
3、恒溫范圍：室溫—450℃任意一點均可恒溫。(可自己修正溫度)
4、溫度精度：±0.1℃。
5、溫度分辨率：0.1℃。
6、計時范圍：0.1——999.000秒。
7、計時精度：0.1秒。
8、切料方式：自動、手動、時控三種切料方式。
9、自動計算融指數(shù)，配有打印機，可打印試驗報告。
10、口模材質(zhì)：碳化鎢。
11、口模直徑：2.095 mm。
12、熔體流動速率測試范圍：0.001~500.000g/10 min （MFR）
13、 控制方式：雙溫控
14 、升溫時間：10分鐘
15 、口模塞規(guī)：孔徑2.0904/2.1006 mm
16、活塞：Φ( 9.4742 ±0.007) mm 活塞頭長度6.35 mm土0.10 mm
下邊緣半徑0.4—（0.0-0.1）mm
活塞桿細環(huán)形參照標線相距30 mm士0.2mm
17 、細孔模: 碳化鎢材質(zhì)
外徑：( 9.55 ±0.005) mm
孔徑：( 2.0955 ±0.0051) mm
長度：( 8.00 ±0.001 ) mm
18、具有超溫保護功能，溫度到達極限值侯自動停止加熱。
六、工作環(huán)境條件：
環(huán)境溫度為10℃-40℃；
環(huán)境相對濕度為30%-80%；
周圍無腐蝕性介質(zhì)，無較強的空氣對流；周圍無振動、無較強的磁場干擾。
七、儀器外形尺寸：250×350×510=（長×寬×高）
八、砝碼配置：（砝 碼 精 度：0.01%）
級別質(zhì) 量重 量組成
1級0.325 kg3.187 N活塞桿+砝碼托盤+隔熱套+1號砝碼體
2級1.200 kg11.77 N0.325+2號0.875砝碼
3級2.160 kg21.18 N0.325+3號1.835砝碼
4級3.800 kg37.26 N0.325+4號3.475砝碼
5級5.000 kg49.03 N0.325+5號4.675砝碼
6級10.000 kg98.07 N0.325+5號4.675砝碼+6號5.000砝碼
7級12.000 kg122.58 N0.325+5號4.675砝碼+6號5.000+7號2.500砝碼
8級
21.600 kg
211.82 N
0.325+2號0.875砝碼+3號1.835+4號3.475+5號4.675+6號5.000+7號2.500+8號2.915砝碼
九、附件配置：
防爆工具箱 1個 ABS
砝碼 1套 計8件（其中1號砝 碼組合在1級內(nèi)）
砝碼托盤 1個 （組合在1級砝碼內(nèi)）
料斗 1個 （不銹鋼）
口模清理棒 1個 （不銹鋼）
裝料桿 1個 （不銹鋼）
料筒清洗桿 1個 （不銹鋼）
活塞桿 1個 （不銹鋼）
口模 1個 （碳化鎢）
水準儀 1個 （45#鋼）
九、熔體流動速率計算公式：
MFI值：即為分子量流動與剪切速率之間的關(guān)系。
熔體流動指數(shù)值國際通用單位是：g/10min;意思即為每10分鐘流出多少克？就是指塑膠在熔融狀態(tài)下，600秒時間擠出來的量，
熔體（質(zhì)量）流動速率儀用MFR表示，單位為：克/10分鐘（g/min）公式表示：MFR(θ、mnom )
=tref .m/t
式中： θ—— 試驗溫度
mnom— 標稱負荷Kg
m —— 切斷的平均質(zhì)量g
tref —— 參比時間（10min）, S ( 600s )
t —— 切斷的時間間隔s
舉例：一組塑料試樣，每30秒鐘切取一段，各段質(zhì)量的結(jié)果是：0.125克、0.132克、0.138克、0.129克、0.135克取。
平均值m =（0.125+0.132+0.138+0.129+0.135）÷5=0.131(克)
代入公式：MFR=600×0.131/30=2.620(克/10分鐘)
MI值=2.620g/10min
A Product Introduction
WJ-400A Melt Flow Rate Instrument is an instrument for testing the flow properties of thermoplastics at high temperatures. Our Melt Flow Rate Instrument adopts the latest micro-computer control in the United States, Chinese operating interface, automatic test results; It is used for polyethylene (PE), polypropylene (PP), polyformaldehyde (POM), polystyrene (PS), ABS plastics, polycarbonate (PC) and other melt flow rates at high temperatures. The MFR value can be measured by measuring the MFR value. There are two ways of cutting material manually and automatically. It has the advantages of simple operation and high control accuracy.
2. Compliance with standards:
The instrument implements the requirements of JB/T5456 standard and is applicable to GB/T3682, ASTM D1238, ISO1133 and other standards.
Standard Test Method for Melt Flow Rate of ASTMD 1238-13 Thermoplastics Extrusion Plasticity Meter
Measurement of Melt Mass Flow Rate (MFR) and Melt Volume Flow Rate (MVR) of ISO1133-1-2:2011 Thermoplastics
Measurement of Melt Mass Flow Rate and Melt Volume Flow Rate of GB/T3682 Thermoplastic
Determination of Melt Mass Flow Rate (MFR) and Melt Volume Flow Rate (MVR) of Plastic Thermoplastics GBT 3682.1-2018 Part 1: Standard Method
Measurement of Melt Mass Flow Rate (MFR) and Melt Volume Flow Rate (MVR) of Plastic Thermoplastics GBT 3682.2-2018 Part 2: Test Method for Materials Sensitive to Time-Temperature History and/or Humidity
3. Working Principle:
The melt flow rate meter is an extrusion plastic meter. It uses a high-temperature heating furnace to melt the measured material at a specified temperature. The extrusion test is carried out by means of a small hole with a certain diameter under the specified load gravity of the weight. In the plastic production of industrial enterprises and research institutes, the "melt (mass) flow rate" is often used to express the physical properties of polymer materials such as fluidity and viscosity in the melting state.
Fourth, product advantages:
Excellent craftsmanship
Microcomputer Programming Control
Computer PID temperature control, high temperature precision
Automatic temperature correction
Automatic cutting
Technical performance:
1. Display mode: LCD screen.
2. Measurement method: mass method (MFR).
3. Constant temperature range: room temperature - 450 C can be constant at any point. (Temperature can be adjusted by oneself)
4. Temperature accuracy: +0.01 C.
5. Temperature resolution: 0.01 C.
6. Timing range: 0.01-999.000 seconds.
7. Timing accuracy: 0.01 seconds.
8. Cutting methods: automatic, manual and time-controlled.
9. Automatically calculates the financial index, equipped with a printer, which can print the test report.
10. Die material: tungsten carbide.
11. Die diameter: 2.095 mm.
12. Measurement range of melt flow rate: 0.001-3000.000g/10 min (MFR) 13 control mode: double temperature control
14 heating time: 10 minutes
15 die plug gauge: aperture 2.0904/2.1006 mm
16 Pistons: _(9.4742+0.007) mm piston head length 6.35 mm soil 0.10 mm
Radius of lower edge 0.4 -(0.0-0.1) mm
Piston rod thin ring reference line 30 mm x 0.2 mm apart
17 Fine Hole Die: Tungsten Carbide Material
Outer diameter: (9.55 +0.005) mm
Aperture: (2.0955+0.0051) mm
Length: (8.00 + 0.001) mm
18 has the function of over-temperature protection. When the temperature reaches the limit, the heating stops automatically.
6. Working environment conditions:
The ambient temperature ranges from 10 to 40 degrees Celsius.
The relative humidity of the environment is 30% - 80%.
There is no corrosive medium around, no strong air convection, no vibration around, no strong magnetic field interference.
7. Size of instrument: 250 x 350 x 510= (length x width x height)
8. Weight allocation: (Weight accuracy: 0.01%)
Grade Mass Weight Composition
Grade 1 0.325 kg 3.187 N piston rod+weight tray+heat insulation sleeve+weight body
Level 2 1.200 kg 11.77 N0.325+2 0.875 weight
Level 3 2.160 kg 21.18 N0.325+3 1.835 weight
Level 4 3.800 kg 37.26 N0.325+4 3.475 weight
Level 5.000 kg 49.03 N0.325+5 4.675 weight
6 grade 10.000 kg 98.07 N0.325+5 4.675 weight+6 5.000 weight
Level 7 12.000 kg 122.58 N0.325+5 4.675 weight+6 5.000+7 2.500 weight
Level 8
21.600 kg
211.82 N
0.325+2 0.875 weight+3 1.835+4 3.475+5 4.675+6 5.000+7 2.500+8 2.915 weight
IX. Appendix Configuration:
Explosion-proof Toolbox 1 ABS
Weight sets consist of 8 pieces (of which the combination of weights is within grade 1)
Weight tray 1 (combined in level 1 weight)
Hopper 1 (stainless steel)
One die cleaning rod (stainless steel)
One loading rod (stainless steel)
Barrel Cleaning Rod 1 (Stainless Steel)
Piston rod 1 (stainless steel)
Die 1 (Tungsten Carbide)
Level 1 (45 # steel)
9. Formula for calculating melt flow rate:
MFI value: the relationship between molecular weight flow and shear rate.
The international general unit of melt flow index is g/10 min, which means how many grams are flowed out every 10 minutes? It means the amount of plastic extruded in 600 seconds in melting state.
The melt (mass) flow rate meter is expressed by MFR in g/10 min (g/min) formula: MFR (theta, mnom)
= tref.m/t
In formula: theta - test temperature
Mnom-nominal load Kg
M - Average cut-off mass G
Tref - Reference time (10 min), S (600 s)
T - the time interval of disconnection s ____________
For example, a group of plastic samples are cut every 30 seconds. The quality of each section is 0.125 g, 0.132 g and 0.138 G.
