XNR-400C Melt Flow Rate Tester

Test items: Used to determine the melt flow rate of polyethylene, polypropylene, polyoxymethylene, ABS resin, polycarbonate, nylon fluoroplastics and other polymers at high temperatures

The XNR-400C melt flow rate tester is an instrument for measuring the flow properties of plastic polymers at high temperatures according to the test method of GB3682-2018. It is used for polyethylene, polypropylene, polyoxymethylene, ABS resin, polycarbonate, and nylon fluorine. The measurement of the melt flow rate of polymers such as plastics at high temperatures. It is suitable for production and research in factories, enterprises and scientific research units.

Main Features:
1. Extrusion part:
Diameter of the discharge port: Φ2.095±0.005 mm
The length of the discharge port: 8.000±0.005 mm
Diameter of charging cylinder: Φ9.550±0.005 mm
Length of charging barrel: 160±0.1 mm
Piston rod head diameter: 9.475±0.005 mm
Piston rod head length: 6.350±0.100mm
2. Standard test force (level eight)
Level 1: 0.325 kg = (piston rod + weight tray + heat insulation sleeve + 1 weight body) = 3.187N
Level 2: 1.200 kg=(0.325+0.875 weight No. 2)=11.77 N
Level 3: 2.160 kg = (0.325 + No. 3 1.835 weight) = 21.18 N
Level 4: 3.800 kg=(0.325+No. 4 3.475 weight)=37.26 N
Level 5: 5.000 kg = (0.325 + No. 5 4.675 weight) = 49.03 N
Level 6: 10.000 kg=(0.325+No. 5 4.675 weight + No. 6 5.000 weight)=98.07 N
Level 7: 12.000 kg=(0.325+No. 5 4.675 weight+No. 6 5.000+No. 7 2.500 weight)=122.58 N
Level 8: 21.600 kg=(0.325+0.875 weight of No. 2+1.835 weight of No.4+3.475+No.5 4.675+No.6 5.000+No.7 2.500+No.8 2.915 weight)=211.82 N weight relative error ≤ 0.5%.
3. Temperature range: 50-300℃
4. Constant temperature accuracy: ±0.5℃.
5. Power supply: 220V±10% 50Hz
6. Working environment conditions: the ambient temperature is 10℃-40℃; 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 interference.

Structure and working principle:
The melt flow rate meter is an extruded plastic meter. It uses a high-temperature heating furnace to make the measured object reach a molten state under the specified temperature condition. The test object in this molten state is subjected to an extrusion test through a small hole of a certain diameter under the load gravity of a prescribed weight. In the plastic production of industrial enterprises and the research of scientific research units, the “melt (mass) flow rate” is often used to express the physical properties of polymer materials in the molten state such as fluidity and viscosity. The so-called melt index refers to the average weight of each section of the extrudate converted into the extrusion volume of 10 minutes.
The melt (mass) flow rate meter is expressed by MFR, the unit is: grams/10 minutes (g/min), and the formula is expressed by: MFR (θ, mnom )=tref .m/t
In the formula: θ—— test temperature
mnom— nominal load Kg
m —— the average mass of the cut g
tref —— reference time (10min), S (600s)
T —— cut off time interval s
Example: A set of plastic samples are cut every 30 seconds, and the mass results of each section are: 0.0816 g, 0.0862 g, 0.0815 g, 0.0895 g, and 0.0825 g.
Average m = (0.0816+0.0862+0.0815+0.0895+0.0825)÷5=0.0843(g)
Substitute into the formula: MFR=600×0.0843/30=1.686 (g/10 minutes)
This instrument is composed of a heating furnace and a temperature control system and is installed on the base of the body (column).
The temperature control part adopts the single-chip microcomputer power and temperature control method, which has strong anti-interference ability, high temperature control accuracy, and stable control. The heating wire in the furnace is wound on the heating rod according to a certain rule to minimize the temperature gradient to meet the standard requirements.