1 Foreword

This XNR-400C melt flow rate indexer is designed and manufactured according to standards like GB/T 3682-2000 Determination of the Melt Mass-Flow Rate and the Melt Volume-Flow Rate of Thermoplastics and ISO 1133-2005 Plastics-Determination of the Melt Mass-Flow Rate (MFR) and the Melt Volume-Flow Rate (MVR), the main application of which is to measure mass flow rate. The functions of this instrument are measuring melt-mass flow rate manually, measuring melt mass-flow and volume-flow rate automatically, and measuring melt density. It is equipped with automatic cutting device, a micro printer to print testing results, a FLASH memory which is able to store results of 20 manual tests, 20 automatic tests and density data of 50 kinds of melt at different temperature or of different material.

This indexer is featured as simple structure, accurate measurement, stable and reliable performance and easy to use. It can be applied to tests of not only engineering plastic at high melting temperature like polycarbonate, fluoroplastics and nylon, but that at low melting temperature like polythene, polypropylene, polystyrene and ABS resin. As a result, XNR-400C melt flow rate indexer is widely used in plastic production and petrochemical industry, and related universities, scientific research departments and commodities inspection authorities as well.

2 Major Technical Index and Operating Conditions

2.1 Major Technical Index

2.1.1 Extruding and Discharging Part

Outlet diameter:Φ2.095±0.005 mmOutlet length: 8.000±0.025mmCylinder diameter: Φ9.550±0.025 mmCylinder inner length: 152±0.1 mm

Piston rod head diameter：Φ9.475±0.015 mmPiston rod head length: 6.350±0.100 mm

2.1.2 Test Load

Test load is realized through different combinations of a set of weights and a piston rod. There are eight levels these combinations can provide as nominal load that is necessary for testing:Level 1: 0.325kg = (piston rod +weight tray +insulation cover +1# weight) =3.187NLevel 2: 1.200kg= (0.325kg +2# 0.875kg weight) =11.77NLevel 3: 2.160kg= (0.325kg +3# 1.835kg weight) =21.18NLevel 4: 3.800kg= (0.325kg +4# 3.475kg weight) =37.26NLevel 5: 5.000kg= (0.325kg +5# 4.675kg weight) =49.03NLevel 6: 10.000kg= (0.325kg +5# 4.675kg weight +6# 5.000kg weight) =98.07NLevel 7: 12.500kg= (0.325kg +5# 4.675kg weight + 6# 5.000kg weight+7# 2.500kg weight) =122.58NLevel 8: 21.600kg= (0.325kg +2# 0.875kg weight +3# 1.835kg weight +4# 3.475kg weight +5#

4.675kg weight +6# 5.000 kg weight +7# 2.500kg weight +8# 2.915 kg weight)=211.82N

2.1.3 Temperature Control

Controllable range: ambient temperature～400℃Temperature fluctuation: ≤±0.1℃8h drift: ≤0.1℃Temperature gradient: ≤0.5℃Resolution ratio: 0.1℃Error correction: two points linear correctionTemperature recovery time: ≤4 min

2.1.4 Characteristics of Timing

Timing precision: 0.01 SDisplay precision: 0.1 STiming range: 9999.9 S

2.1.5 Piston Rod Displacement Precision

Piston rod displacement precision: 0.01 mm

2.1.6 Appearance

Length 290× width 410× height 630（mm）

2.2 Working Conditions

Ambient temperature 10℃—35℃, no vibration and corrosive media around

Installed correctly on a stable basis and adjusted to levelNo influence of strong magnetic field and no strong air convection when working. Supply voltage: AC220V, frequency 50Hz 5A, fluctuation range of the supply voltage no more than

±10%

3 Principles and Structure

3.1 Main Principle

Melt flow rate indexer is actually a kind of extrusion plastometer, which first heats the tested object through a high temperature muffle furnace to melt it, and then conduct extrusion test under a certain load through the standard die. The melt’s mass or volume that flows through this standard die in every 10 minutes is exactly the melt flow rate of the tested object.

3.1.1 Melt Mass-Flow Rate Method (MFR)

The Mass-Flow Rate method is abbreviated as MFR. Measurement unit: gram/10min.Calculation formula: M

(θ:testing temperature,℃Mnom: nominal load，kgtref: reference time（10min），second（600s）

M: average mass of sample bar t: sample interval, s )Example: There is a tested object with is cut once every 30 seconds and in total cut five times. The masses of these bars are: 0.0816 g, 0.0862 g, 0.0815 g, 0.0895 g, 0.0825 g. The average mass M: (0.0816 g+0.0862 g+ 0.0815 g+ 0.0895 g+ 0.0825 g) / 5= 0.0843 gTaking it into the formula: MFR=600×0.0843/30=1.686 (g/10min)

3.1.2 Melt Volume-Flow Rate Method (MFR)

The Melt Volume-Flow Rate Method is abbreviated as MFR.Measurement unit: cm3 /10 min

Calculation formula: MVR(θ，Mnom)=

(θ: testing temperature, ℃ M: nominal load, kg A: sectional area of piston and cylinder tref: reference time (10 min), second (600 s)

t: expected measurement time, s l: expected piston moving measurement distance (cm) )

3.2 Apparatus Structure

This instrument consists of testing system, controlling system, automatic cutting device and load device.

3.2.1 Testing System

(1) CylinderIt is made up of nitriding steel, HV≥700.

(2) Piston rodThis part is made up of nitriding steel, HV≥600. The inner diameter of piston rod head is 0.075±0.015 mm uniformly smaller than that of the cylinder. There is one insulation cover on the piston rod head to insulate the rod with the load. There are two annular marks scribed 30 mm apartand so positioned that the upper one is aligned with the top of the cylinder when the distance between lower edge of the piston head and the top of the die is 20 mm.

(3) Die

Φ2.095±0.005mm, made up of tungsten carbide，HV≥700

3.2.2 Controlling System

(1) Temperature ControlThis system chooses platinum resistance (Pt 100) as temperature sensor, which forms a precision temperature measuring bridge together with a precision resistor, and automatically adjusts the heater’s power through an embedded intelligent system.

(2) Displacement Monitoring DeviceThis indexer chooses high-precision Position transducer to be its displacement monitoring device to monitor the position of the piston in real time.

3.2.3 Automatic Cutting Device

The automatic cutting device is comprised of an electric motor, a decelerator, a position monitoring switch and a blade. It’s controlled by embedded intelligent system and set up at the bottom of the cylinder. Therefore, it is characterized as small and flexible.

3.2.4 Load

The load device consists of eight levels of weights. The weight of load is the sum of the mass of weights and piston. It’s shown in the following chart:

weight(g) combination(g)325 Piston

1200 325＋8752160 325＋18353800 325＋34755000 325＋4675 or 325＋1835＋2840

10000 325＋1450＋1835＋639012500 325＋3475＋4025＋467521600 325＋875＋1835＋3475＋4025＋4675＋6390

4 Preparation and Parameters Selection

4.1 Equipment Placement

Place the indexer on a stable workbench. Next, put the air level into the cylinder, which should be adjusted to level through the bottom bolts.

Take out the cleaning rod, the compression rod and the die rod from the accessory case. Put them at anywhere convenient for use.

Put the die and the piston into the cylinder. (Before leaving our factory, the piston is already placed in the cylinder, while the die is always placed in the accessory case.)

Plug in the indexer. The electric source needs to be equipped with a reliable grounding device and a leakage protection device.

4.2 Sample Preparation

A sample can be of shapes like granules, pieces, thin film, powder, etc. Before tests, please stove the sample according to its corresponding requirements. When a severe random discretion phenomenon appears, it’s important to consider whether it is owing to the sample’s unstable characteristics and if it’s necessary to mix in some stabilizer. (Particularly the powder)Based on the sample’s expected melt flow rate, weigh it following the chart below. If it’s a national standard sample, then weigh it following the instruction of the sample.

Melt Flow Rate(MFR) Sample Added (g)g/10min ISO Standard GB Standard ASTM Method JIS Standard

0.1－0.5 3－5 3－5 2.5--33—5

＞0.5－1 4－6 4－6 3—5

＞1－3.5 4－6 4－6 3—5 3—5

＞3.5－10 6－8 6－8 5—8 5—8

＞10—256－8 6－8 4—8 5－8

＞25Note: When the material’s density is more than 1.0g/cm , maybe it’s necessary to add more.

4.3 Testing Conditions

The national standard GB/T3682-2000 discloses testing conditions in Appendix A and B. Some frequently-used materials’ testing conditions are as follows:

Materials Condition (letter code)Testing

Temperatureθ℃

Nominal Load (combination)m nom,kg

PS H 200 5.00

PE D 190 2.16

PE E 190 0.325

PE G 190 21.60

PE T 190 5.00

PP M 230 2.16

ABS U 220 10.00

PS-1 H 200 5.00

E/VAC B 150 2.16

E/VAC D 190 2.16

E/VAC Z 125 0.325

SAN U 220 10.00

ASA、ACS、AES U 220 10.00

PC W 300 1.20

PMMA N 230 3.80

PB D 190 2.16

PB F 190 10.00

POM D 190 2.16

MABS U 220 10.00

4.4 Cutting Time

When testing by a cutting and weighing method, it’s necessary to set up an expected cutting interval no matter it’s automatically or by hand. If the interval is too short, the mass of the sample will be too small, and therefore leads to a larger influence on weighing error and cutting error. However, the interval shouldn’t be too long, because the distance between the two marks is limited, which causes that the mass of the sample is restrained. Besides, we want to realize a parallel comparison among more than two samples. We recommend you to refer to the chart below:

Mass Flow Rate(MFR)

g/10min

Cutting time（s）ISO Standard GB Standard ASTM Method JIS Standard

0.1—0.5 240 240about 360

about 240

＞0.5—1 120 120 about 120

＞1—3.5 60 60 about 180 about 60

＞3.5—10 30 30 about 60 about 30

＞10—255—15 5—15

about 30 about 5—15

＞25 about 15

4.5 Moving distance

When using the automatic measurement function and calculating the mass of flow through the melt’s density and the piston’s moving distance, it’s indispensable to set up a proper moving distance at the beginning. A too short distance will lead to a larger measurement error. We recommend you to choose this distance on the basis of expected MFR and refer to the chart below:

MFR (g/10min) Piston’s Distance (mm)0.01~0.5 100.5~10 10~20

＞10 20~28

5 Function of the Keys

The board of this indexer consists of twelve keys. Their functions are:

5.1 Heat

Press this key to let the indexer to heat the tested object. The set temperature will be reached after about 10 to 15 minutes. After that, you can begin testing 15 minutes later.

5.2 Test

When using the MFR method, pressing this key leads to the indexer first finishing a pre-cutting procedure to discharge the remains of the previous sample, and beginning timing simultaneously. It will cut once after every interval until the set cutting times is reached, and then stop timing. When using the automatic method, pressing this key results an automatic cut to discharge the previous remains. Then the indexer will prepare for testing process based on the requirements of its user. If time is set as testing basis, then the indexer will cut another time after this interval and meanwhile it will stop timing and show the testing results. Else if displacement is set as testing basis, then it won’t cut until a set displacement is reached. After that the indexer will still stop timing and show the testing results.

5.3 Cut

Press this key and the indexer will automatically cut the sample once. Generally it’s used for discharging previous remains.

5.4 Setting

This key is used to set parameters and choose methods available: MFR method, automatic method and melt density measurement. You can set the parameters according to different methods.

5.5 Calculation

In MFR method, this key is used for inputting the mass of the bars cut, calculating and storing the testing results. In the measurement of melt’s density, it’s used for inputting the mass of the bars cut, calculating and storing the melt’s density.

5.6 Query

Pressing this key you can query the results stored before. When the indexer is at the interface of MFR method, it will display the results of MFR method. It’s also the same case for the automatic method.

5.7 Delete

When referred to previous results, pressing this button can delete the record at current location.

5.8 Print

This key makes it available to print current record when referring to testing records or detailed information of tests.

5.9 Increase/ Upward

This key is for switch options and changing data. When changing data, pressing once allows you to change the number at lowest number. If you want to change the number at the last but one order, please press the key and hold on for some time. When the indexer is waiting for instructions, pressing orderly increase-decrease-increase-decrease and then it begins its temperature revision.

5.10Decrease/ Downward

This key is also for switching options and changing data. When changing data, pressing once allows you to change the number at lowest number. If you want to change the number at the last but one order, please press the key and hold on for some time.

5.11Stop/ Back

When testing, pressing this key will stop the whole test. When heating before testing, pressing this key will stop heating.When inputting parameters or referring to testing records, pressing this key will go back to operation interface.

5.12Confirm

When setting data, please press this key to order the indexer to receive set values.

6 Usage Directions

6.1 Tests Preparation

(1) Place the die: Push the handle of the die’s baffle, and then push the baffle to the bottom. Place the die from the top and use the compression rod to push it until it touches the baffle.

(2) Place the piston from the top of the furnace into the cylinder.(3) If using automatic method and melt density measurement, please install the tie rod for

displacement sensor. (4) Prepare proper ample for testing. (Please refer to the chart in 4.2)

For previous process like drying and stabilizing, please refer to national standards of corresponding materials.

6.2 Starting Up

Turing on the indexer, it will go into a corresponding interface according to the method chosen.

If the method used last time before turning off is MFR method, it will go into the MFR method interface like following picture:

Picture 1 MFR method Interface

On this interface, the first line shows current temperature and current position of displacement sensor. The second line shows set temperature, total cuts and cutting interval. The third line show testing process, including cuts already conducted and timing. The forth line shows whether it’s heating or waiting for instructions.

If the method used before turning off last time is automatic method, it will go into the interface shown in the following picture:

Picture 2: Automatic Test Interface

In the automatic method interface, the first line shows current temperature and current position of displacement sensor. The second line shows set temperature. If time is the testing basis, then the second line also shows the time set previously. If displacement is the testing basis, then the second line shows the displacement set previously. The third line shows the data of timing and displacement. The forth line shows whether it’s heating or waiting for instructions.

If it conducted measurement of melt’s density last time, it will display the following picture:

Picture 3: Melt’s Density Test

When measuring the melt’s density, the first line shows current temperature and current position of displacement sensor. The second line shows the temperature set previously and the displacement set previously. The third line shows the current displacement in testing process. The forth line shows whether the indexer is heating or waiting for instructions.

6.3 Set Testing Parameters

Examine current interface and parameters set. If it doesn’t meet practical requirements, please set the parameters again. Press the Set key to enter in the setting interface, as shown in the following picture. (Note: The interface is related to the operation conducted. You can choose different parameter setting interface through choosing different testing methods. This picture takes the example of MFR method)

Picture 4: MFR Method Interface

After entering, the “Testing Method” shows “MFR”. Pressing Upward and Downward let you switch among “MFR”, “Automatic Method” and “Melt Density Measurement”. Press Confirm and then it will go to the corresponding interface.

Under MFR method, the ”Set Temperature” will be underlined after pressing Confirm. If you need to change the temperature, press Confirm. If not, press Downward and the “Total Cuts” will be underlined, followed by circulation. When the underline moves to an item, press Confirm and

that item will twinkle. Pressing Increase and Decrease you can change the numbers. Pay attention that when you press once, the lowest order changes, but only when you press and hold on for a while can the last but one order changes. All the changes are either incremental or degressive.

If automatic method is chosen, the following picture will appears:

Picture 5: Automatic Test Interface

When setting parameters of automatic method, the second line is for setting testing temperature. Please refer to the 4.3 for temperature choosing.

The third line is testing basis, that is, whether it is displacement or temperature that is chosen for testing basis. For example, suppose that choosing displacement as basis and set it as 10 mm. Then the testing process begins when pressing the Test button, and ends when piston moves 10mm. Results are shown after that. If time is used as basis, then set it as 30 seconds so after 30 seconds the indexer will stop and show the results. When the underline moves to “Displacement”, press Confirm and then the item begins to twinkle. Press Upward and Downward to change to “Time”. After that, press Confirm and set corresponding time or displacement. (Please refer to 4.5)

The forth line is for choosing material and density. It’s only available to choose the orders of material, with density automatically shown. The density item only shows the melt’s density that is related to the temperature set previously. For instance, if the temperature is set as 190 degrees centigrade, then only the density under 190 degrees centigrade is shown. If the required density is not available, then please enter the “Melt Density Measurement” interface to input that density, as shown in 6.6.

In the indexer’s system there are two kinds of melt density that are internationally recognized.

One isρPE(190℃)=0.764 g/cm3 with the number “001”. The other isρPP(230℃)=0.739

g/cm3with the number “002”. Modified materials, materials with additives or other materials should use this indexer to measure their density in order to guarantee accurate results.

After choosing “Melt Density Test” and press the Confirm key, the following interface is shown:

Picture 6 Melt Density Test Interface

On this interface, the only thing you need is to set testing temperature and displacement.

6.4 MFR Method

6.4.1 Heat

After setting the parameters, press the Heat button and then the indexer begins to heat the tested object. It will reach the preset temperature after 10 to 15 minutes and remain stable with a tiny fluctuation of 0.1 degree centigrade. The whole test can begin 15minutes after the temperature becomes stable.

6.4.2 Test

Before tests, take out the piston first and put sample into the cylinder through the charging hopper and the charging rod. Be sure to pack the sample down in order to avoid the emergence of bubbles. After that, put the piston into the cylinder again. The whole procedure should be finished in 1 minute. If the sample already flows out from the die during the process, please press the Cut button to cut this par and scarp it. If the sample melt and flow quickly, please use a copper wire or an aluminum wire that has a diameter of around 2 cm to plug up the die’s outlet, and take it out when compress the sample.

The cylinder’s temperature will decrease when putting in the sample, but will be back to the set one after 2 to 3 minutes. 4 minutes later, put the required load on the piston and place the sample tray below the die’s outlet. If the die is plugged up before, take out the wire first. Then the sample flows from the die and piston begins to descend. In this process, if it’s necessary to cut the extrudate, please press the Cut button.

When the piston descends to the degree that the lower mark is at the same level with the top of guide bushing, press the Test button. Then the system begins timing and cut the extrudate automatically. Please discard this extrudate and the extrudates before.

After every interval, the indexer will cut the sample automatically and buzz. After the total cuts are realized, the indexer will stop. If the total cuts are still not realized, but the mark is already at the same level as the guide bushing, please press the Stop button and discard all subsequent extrudate.

During the process, you can press the Stop button to stop timing. Then the indexer will get back to the temperature controlling state. Press the Timing button again and then the indexer will restart its test and begin timing.

After testing, please keep the indexer extruding in a constant temperature until all the sample are discharged out. Then take out the load as well as the piston, and clean the piston. Pull the handle of the die’s baffle, and take out the die using the charging rod. Use the die cleaning rod to purge the sample remaining in the hole of the die. Then use a strip of cloth to clean the die before it

cools down. Bind a piece of clean white gauze to the cleaning rod and wipe the cylinder clean before it cools down.

Attention: the cleaning of the piston, the cylinder and the die is very important. If they are not clean enough, next test will be highly influenced.

(During the cleaning process, the cylinder and its related part are still at high temperature, please be careful.)

6.4.3 Weigh and Calculate

Weigh the sample bars without bubbles, and discard those whose mass are more than 15% of average value. Select more than three qualified sample bars and input their data into the indexer to calculate.On the MFR surface, press the Calculate button to enter the MFR method calculation interface, as shown below:

Picture 7: MFR Test Calculation Interface

The Test Number is defined by the user through three figures. It would be better to keep an record in case of future use. The Material Number, Temperature, Timing come from those preset parameters and therefore generally there is no need to change. (material number, testing temperature and cutting interval) Move the underline to the position of Mass and then press the Confirm button to input mass. Then press the Confirm button again to let the indexer receive the input number. The number of cuts is changed to 2 automatically and the corresponding calculation results are displayed. (Please refer to 3.1.1 MFR to see the calculation principles.) After inputting the number of mass of all the bars, press the Back button and then the “Yes” at the position of “Store or Not” begins to twinkle. If you want to store it, please press the Confirm button. Else please switch to “No” and press the Confirm button to return to working stage.

6.4.4 Query and Print out Results

If you want to query and print out the stored testing results, please press the Query button when the indexer is waiting for instructions, as shown below:

Picture 8: Query the testing records of MFR

The twinkling triangle indicates current record. You can press the Upward and Downward button to switch among all the records. Select one of them and press the Confirm button, and then the detailed information of that test is shown as following:

Picture 9: Detailed Information Interface of MFR MethodYou can press the Print button on the interface of both selecting records and detailed information to print out the results. Press the Back button and the system will go back to working interface. The masses of all the bars will be listed in the print results, but only the testing conditions and results are included in the detailed information shown. On the list interface, pressing the Delete button can delete current record.

6.5 Automatic Method

6.5.1 Heat

After setting the parameters, press the Heat button and then the indexer begins heating and after 10 to 15 minutes it reaches a stable temperature, which is around the preset temperature with a small fluctuation of 0.1 degree centigrade. Tests can be conducted after 15 minutes.

6.5.2 Tests

Before tests, take out the piston first and put sample into the cylinder through the charging hopper and the charging rod. Be sure to pack the sample down in order to avoid the emergence of bubbles. After that, put the piston into the cylinder again. The whole procedure should be finished in 1 minute. If the sample already flows out from the die during the process, please press the Cut button to cut this par and scarp it. If the sample melt and flow quickly, please use a copper wire or an aluminum wire that has a diameter of around 2 cm to plug up the die’s outlet, and take it out when compress the sample. The cylinder’s temperature will decrease when putting in the sample, but will be back to the set one after 2 to 3 minutes. 4 minutes later, put the required load on the piston and place the sample tray below the die’s outlet. If the die is plugged up before, take out the wire first. Then the sample flows from the die and piston begins to descend. In this process, if it’s necessary to cut the extrudate, please press the Cut button.When the piston descends to the degree that the lower mark is at the same level with the top of guide bushing, press the Test button. Then the system begins timing and cut the extrudate automatically. Please discard this extrudate and the extrudates before. When the preset time or displacement is reached, the test stops automatically and displays the

testing results as following: Picture 10: Automatic Test Results InterfaceAt this time, the Test Number twinkles and requires the user to input a number. The Test Number is defined by the user and it would be better to keep records in case of future use. Press the Confirm button to store it, or press the Back button to return to working interface.Attention: If the Back button is pressed, then the results are discarded so there is no way to get them back. If you really don’t want to store them but need them at the same time, please record them by hand first and then press the Back button.After testing, please keep the indexer extruding in a constant temperature until all the sample are discharged out. Then take out the load as well as the piston, and clean the piston. Pull the handle of the die’s baffle, and take out the die using the charging rod. Use the die cleaning rod to purge the sample remaining in the hole of the die. Then use a strip of cloth to clean the die before it cools down. Bind a piece of clean white gauze to the cleaning rod and wipe the cylinder clean before it cools down.Attention: the cleaning of the piston, the cylinder and the die is very important. If they are not clean enough, next test will be highly influenced. (During the cleaning process, the cylinder and its related part are still at high temperature, pleace be careful.)

6.5.3 Query and Print out Results

If you want to query and print out the stored testing results, please press the Query button when the indexer is waiting for instructions, as shown below:

Picture 11: Query the testing records of Automatic TestThe twinkling triangle indicates current record. You can press the Upward and Downward button to switch among all the records. Select one of them and press the Confirm button, and then the detailed information of that test is shown as following:

Picture 9: Detailed Information Interface of Automatic MethodYou can press the Print button on the interface of both selecting records and detailed information to print out the results. Press the Back button and the system will go back to working interface. The masses of all the bars will be listed in the print results, but only the testing conditions and results are included in the detailed information shown.

On the list interface, press the Delete button can delete current record.

6.6 Melt Density Measurement

For a new kind of material, if the melt’s density is known, then just input it. Else if the density is unknown, then you can use this function to measure it. Please pay attention that the melt ’s density is relevant to temperature, so it is always shown as :

ρ material (temperature) = n (g/cm3)The calculation formula is

ρ material (temperature) = m / (0.711L) (g/cm3)In this formula: m: mass of the tested bar

L: displacement When testing or inputting the melt’s density, it’s important to input the corresponding temperature. Only in this way can it appears in the Melt Density item when using MFR. Else the density item can’t be chosen if the temperature is wrong.

6.6.1 Testing Methods

This is similar to automatic method, so please refer to 6.5.2. After tests the indexer will automatically go into the mass inputting interface. Please weigh the cut bars and input their masses as well as the material number and testing temperature. Then the indexer can calculate the melt’s density and store it.

6.6.2 Calculate Density through Inputting Mass

After measuring the melt’s density, the indexer automatically go into the following interface. Or pressing the Calculate button at melt’s density measurement interface, the interface will be shown as Picture 13.

Picture 13: Inputting Melt’s Mass InterfaceOn this interface, please first put in the material number. Generally, the number shouldn’t be 1 or 2. These two are for the system’s acquiescent materials. (1 for PE, 2 for PP) Other numbers are defined by the user, which should be recorded in case of future use. Next, input the bars’ mass. There may be very long bars.The second line shows the preset temperature and displacement. Please don’t change them if they are correct. The indexer will automatically calculate the melt’s density and display it. You can press the Back button and the density will be automatically stored. You can directly choose this density when

using this material in automatic method later.

6.6.3 Query the Stored Data

On the melt density measurement interface, you can press the Query button to have a look at the stored records of melt density, as shown in Picture 14. Pressing the Upward button or Downward button, you can switch among all the records and use the Delete button to delete the record.

Picture 14: Melt Density Records InterfaceYou can press the Back button to return to working interface.

7 Indexer Rectification

There will be errors in temperature and displacement after a long-time use, so the indexer needs to be rectified annually. The precision of temperature and displacement are two items that needs to be rectified as for this indexer.

7.1 Temperature Rectification Method

You can use a mercury-in-class thermometer to measure the temperature of the furnace. If the real temperature is obviously different from that shown on the screen, you need to rectify it. Please adopt the two-point correction method. That is, choose a low temperature (generally it’s

room temperature) and a high temperature (choose one between 200℃～300℃) to rectify the temperature curve.

Operations:Preparation:Place the indexer in an indoor environment with constant temperature and no strong air convection. After installing the die and turning on the indexer, press orderly “Increase-Decrease- Increase-Decrease” when the indexer is waiting for instructions. Then the indexer begins to rectify itself, as shown below:

Picture 15: Indexer Rectification Interface

Set respectively the data of “Low Shown”, “Low Measured”, “High Shown” and “High Measured” as 10, 10, 300 and 300. Then after the cursor moves to “beginning”, press the Back button and turn off the indexer. Please wait for at least 4 hours. (The indexer can be placed in laboratory and rectify it in the morning when you begin working)

Measuring the low temperature:Choosing a mercury-in-glass thermometer with a range of 0~50℃ and a precision of 0.1℃, place it in the cylinder and fixed it when the bottom of the thermometer is 20 mm away from the bottom of the cylinder. Then turn on the indexer but don’t press the Heat button. After 20 minutes, read the temperature shown on the screen (used as “Low Shown”) and that on the thermometer. (used as “Low Measured”) Record them on a piece of paper.

Measuring the high temperature:Choosing a high temperature for the indexer, such as 290℃.Then use MFR as testing method and set the temperature as 290℃. Exchange the 0-50℃ thermometer with a 250~300℃ thermometer that has a precision of 0.1℃. Then press the Heat button. After the temperature is fixed at 290℃, wait for another 15 minutes to make the thermometer show the same temperature as that of the furnace. Then record the temperature shown on the screen (used as “high shown”) and the temperature shown on the thermometer (used as “high measured”).

Input the rectified data:Press the Stop button to make the indexer wait for instructions, and then press orderly “Increase –Decrease-Increase-Decrease”. The indexer will enter the following interface to let you input the data of “Low Shown”, “Low Measured”, “High Shown” and “High Measured”. When the cursor moves to the “Beginning” position, press the Back button to finish the whole rectification.

7.2 Displacement Rectification Method

Select height gauge with a precision of 0.02mm and place it smoothly to the furnace. Adjust it to let the nonius absorb the magnet at the top of displacement sensor. Then do the same procedure

as temperature rectification method to prepare the indexer. Move the cursor to the “Beginning” position and press the Confirm button. Adjust the height of height gauge to change the data at the beginning to 5000 and record the position of height gauge. Press the Confirm button and move the cursor to the position of “30mm”. Press the Confirm button again and move down the nonius of the height gauge by 30 mm. Press the Confirm button until the numbers become constant. Finally, press the Back button to finish rectification.

8 Attentions

1) The electric source must be equipped with a reliable grounding device, in case of the danger of electricity leakage.

2) If the screen goes wrong, please turn off the indexer and turn it on again. Then press the Heat button to restart working.

3) When cutting, if the sample sticks to the knife, you can smear some lubricant to the knife.4) If the knife fails to cut normally or it is seized up owing to fixed to the die too tightly, please

loosen the knife and fix the screw to adjust the position of the knife.5) Please heat the die and the piston together.6) Be sure to clean the cylinder, the die and the piston carefully to keep the indexer’s precision

and usability.7) Be sure to wear protective equipment like insulation gloves when cleaning the machine, in

case of scald.