XNR-400D

1Working Principle

XNR—400DThe melt flow rate instrument is a plastic extrusion instrument. It uses a high-temperature heating furnace to melt the tested material under specified temperature conditions. The melted material is extruded through a small hole of a certain diameter under a specified load for testing. In plastic production, the melt index is commonly used to represent the flowability, viscosity, and other physical properties of polymer materials in a molten state. The so-called melt mass flow rate refers to the average weight of the extruded samples converted to the extrusion amount in 10 minutes. The unit is (g/10min), represented by MFR:

MFR=600×m÷t                         （1）

In the formula: MFR—Melt mass flow rate, g/10min；

m—Average value of multiple samples taken, g；

t—Sampling time interval, s；

      600—Reference time (10min)，s.

Or: MVR=42.7×l÷t                        （2）

In the formula: MVR—Melt volume flow rate, cm³/10min；

l—Piston movement predetermined measurement distance, mm；

t—Sampling time interval, s；

     42.7—Reference time (10min）and the area of the piston.

Example: A set of plastic samples, taking a segment every 30seconds, the results of each segment's weight are:

0.0838grams 0.0862grams 0.0815 grams 0.0895 grams 0.0825 grams

Taking the average value m=(0.0838+0.0862+ 0.0815+0.0895+0.0825)÷5

=0.0847（grams）

Substituting into the formula: MFR=600×m÷30=1.694（g/10min）

That is, the melt index is 1.694g/10min..

2Instrument Model Classification

XNR—400DType PLC control, touch screen

3Technical Specifications

3.1Extrusion discharge part

3.1.1Discharge port inner diameter: φ2.095±0.005mm

3.1.2Outlet length: 8.000±0.025mm

3.1.3Loading cylinder inner diameter: φ9.550±0.025mm

3.1.4Loading cylinder length: 160mm

3.1.5Piston rod head diameter: φ9.475±0.015mm

3.1.6Piston rod head length: 6.350±0.100mm

3.2Weight part: Standard test force (level 1)

5kg, 2.16kg

3.3Temperature Range

   60.0℃～400.0Any set temperature control point within the range.

3.3.1Using a temperature control module to adjust the temperature, reaching the control point in a short time.

3.3.2The touch screen displays the temperature in real-time, can automatically control the temperature, and is convenient for adjustment.

3.4Heating power: 450W

3.5Temperature Control Accuracy

Temperature fluctuation at the upper end of the discharge port 10mm≤±0.5℃ (60~250℃).

Temperature fluctuation at the upper end of the discharge port 10mmTemperature fluctuation ≤±1℃ (250~450℃).

3.6Temperature Gradient

Temperature gradient within 10—150mm range at the upper end of the discharge port <1℃.

3.7Power Supply: 220V±10%, 50Hz.

3.8Instrument Dimensions: 280mm×350mm×600mm.

3.9Instrument Weight: Approximately 30kg(excluding weights).

4.Instrument Structure.

Composite structure.