XNR-400C

1.Usage:

XNR-400CThe melt flow rate tester is designed according to GB3682-2000to measure the flow properties of plastic polymers at high temperatures. It is used for determining the melt flow rate of polymers such as polyethylene, polypropylene, polyformaldehyde, ABS resin, polycarbonate, nylon, fluoroplastics, etc. It is suitable for production and research in factories and research institutions.

2.Main Features:

1.Extrusion outlet section:

Outlet diameter: Φ2.095±0.005 mm

Outlet length: 8.000±0.025 mm

Charging cylinder diameter: Φ9.550±0.025 mm

Charging cylinder length: 152±0.1 mm

Piston rod head diameter: 9.475±0.015 mm

Piston rod head length: 6.350±0.100 mm

2.Standard test forces (eight levels)

1Level: 0.325 kg =(piston rod + weight tray + thermal insulation sleeve + No. 1 weight body)

=3.187N

2级：1.200 kg=(0.325+2号0.875砝码)=11.77 N

3级：2.160 kg=(0.325+3号1.835砝码)=21.18 N

4级：3.800 kg=(0.325+4号3.475砝码)=37.26 N

5级：5.000 kg=(0.325+5号4.675砝码)=49.03 N

6级：10.000 kg=(0.325+5号4.675砝码+6号5.000砝码)=98.07 N

7级：12.000 kg=(0.325+5号4.675砝码+6号5.000+7号2.500砝码)=122.58 N

8级：21.600 kg=(0.325+2号0.875砝码+3号1.835+4号

3.475+5号4.675+6号5.000+7号2.500+8号2.915砝码)=211.82 N

砝码质量相对误差≤0.5%。

3、  温度范围：50-300℃

4、  恒温精度：±0.5℃。

5、  电源：220V±10%    50Hz

6、  工作环境条件：环境温度为10℃-40℃；环境相对湿度为30%-80%；周围无腐蚀性介质，无较强的空气对流；周围无振动、无较强的磁场干扰。

7、  仪器外形尺寸：250×350×600=（长×宽×高）

三、结构及工作原理：

熔体流动速率仪是一种挤出塑料计。它是在规定温度条件下，用高温加热炉使被测物达到熔融状态。这种熔融状态的被测物，在规定的砝码的负荷重力下通过一定直径的小孔进行挤出试验。在工业企业的塑料生产中及科研单位的研究中，经常用“熔体（质量）流动速率”来表示高分子材料在熔融状态下的流动性、粘度等物理性能。所谓熔融指数就是指挤出物各段试样的平均重量折算为10分钟的挤出量。

熔体（质量）流动速率仪用MFR表示，单位为：克/10分钟（g/min）公式表示：MFR(θ、mnom )

                       =tref .m/t

式中： θ—— 试验温度

          mnom— 标称负荷Kg

           m —— 切断的平均质量g

          tref —— 参比时间（10min）, S ( 600s )

           t  —— 切断的时间间隔s

    例：一组塑料试样，每30A segment is taken every second, and the results of each segment's mass are: 0.0816 grams, 0.0862 grams, 0.0815 grams, 0.0895 grams, 0.0825 grams.

Average value m

=(0.0816+0.0862+0.0815+0.0895+0.0825)÷5=0.0843 (grams)

Substituting into the formula: MFR=600×0.0843/30=1.686 (grams/10 minutes)

This instrument consists of a heating furnace and a temperature control system, installed on the base of the machine (column).

The temperature control part uses a microcontroller to adjust power for temperature control, which has strong anti-interference ability, high temperature control accuracy, and stable control. The heating wire inside the furnace is wound around the heating rod in a certain pattern to minimize the temperature gradient, meeting standard requirements.