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72 PET Plus User Manual

12.4 TESTING THE POLYMER

NoTE:

It is very important that the Die, the Barrel and the Follower are scrupulously clean

and have been assembled correctly after cleaning.

It is also important that the PET Plus is set to the “Pre-Test” screen ready for testing.

THIS PROCEDURE IS PART OF THE MAIN PROCEDURE SHOWN IN SECTION 7.7.

Press the key under PURGE to allow a low volume of nitrogen gas to flow through the barrel to

displace any air that may be present. Allow the gas to flow for a few seconds to ensure that the barrel

is full of nitrogen.

Press the key under GAS OFF to stop the flow of nitrogen gas.

Remove the bottom plug from the sample melt pot and position the melt pot onto the top of the barrel.

Remove the top plug from the sample melt pot and push the plug of polymer into the PET Plus barrel

using the charging tool.

Remove the sample melt pot from the top of the barrel.

Insert a clean follower into the top of the barrel.

Insert the charging tool into the top of the barrel.

Immediately press the green GO key to start the test. The “Charging” screen will be displayed.

Содержание Davenport PET Plus

Страница 1: ...PET Plus User Manual 1 Part No 01 3514 June 2011 PET Plus Viscometer including Polymer Dryer and Polymer Grinder User Manual...

Страница 2: ...structions warnings or cautions in the instrument s Instruction Manual If a manufacturing defect is found AMETEK will replace or repair the instrument or replace any defec tive part thereof without ch...

Страница 3: ...GH TEMPERATURES AND MOLTEN POLYMER ARE INVOLVED IN THE VISCOMETER TESTING PROCESS ES ALWAYS WEAR HEAT PROTECTING GLOVES WHEN HANDLING THE DIE FOLLOWERS PROBE CLEANING TOOL AND AREAS AROUND THE HEATED...

Страница 4: ...3 5 1 Default Test Setups 33 5 2 Renaming an Existing Test Setup 34 5 3 Creating a New Test Setup 35 5 4 Defining a Test Setup 36 5 5 Password Protection 37 6 0 training mode 39 6 1 Selecting Training...

Страница 5: ...acing the Drive Belt 78 14 6 Result Discrepancies 79 14 7 Faults in Pressure System 79 14 8 Basic Electrical Checks 79 14 9 Changing a Damaged Probe Rod 80 15 0 calibration 81 15 1 Selecting the Calib...

Страница 6: ...measure the movement of the follower The rate of extrusion is accurately measured by the probe which is designed to operate under the high pressure conditions within the barrel during extrusion The sy...

Страница 7: ...UK The equipment can store up to 600 test results internally and the statistics and results can be easily viewed on the control console display If 600 tests are already stored then when the next test...

Страница 8: ...in practice that the IV drop from polymer chip to preform is usually in the range of 0 02 to 0 03 IV 1 5 measurement range The IV measurement range is approximately 0 45 to 1 40 using dies from 0 015...

Страница 9: ...virgin polymer mixture Drier Efficiency Drop of IV in extruder Target value for moisture determination Melt stability degradation rate IV in finished product re grind 4 Relatively easy test to operat...

Страница 10: ...and bottom blanking plug 6 Barrel Cleaning Tool p n 778 55 Used to charge the sample push a clean ing cloth down the barrel and for die O ring fitting 7 Die Retaining Nut and Fibre Sealing Washer p n...

Страница 11: ...o 284 C 16 Thermometer 293 C 297 C p n 338 104 1032 Used when calibrating to 295 C 17 Tweezers p n 92 0404 Used to hold hot die and followers 18 RS232 Cable p n 09 0639 2 2 consumable items The PET Pl...

Страница 12: ...er drier 2 Vacuum Taps and Hose Quantity 6 Shown Polymer Dryer This assembly is used to connect the phials to the polymer drier It is also used to isolate the phials from the vacuum line at the end of...

Страница 13: ...nd is used to collect molten polymer from the produc tion extruder to check the IV of the polymer during the extrusion process It is mainly used to collect a sample from a textile spinneret and is not...

Страница 14: ...Hot Plate To aid cleaning of follower put the dirty followers on the hot plate PET will carbonate and be easier to remove 2 9 4 PTFE Tape To seal gas connection joints 2 9 5 Razor Blade Scalpel To scr...

Страница 15: ...ight may be applied to the top of the barrel via the cleaning tools 2 The equipment should only be used in a well ventilated environment however the area needs to have a stable temperature and be drau...

Страница 16: ...ituated within two metres of both electrical and nitrogen gas supplies The polymer grinder must be situated as close as possible to the vacuum pump if this drying option is used The polymer grinder is...

Страница 17: ...g is heard or a leak is shown up by soap solution then gas will escape allowing a drop in pressure A leak can usually be cured by using PTFE tape on the leaking connection and then re connecting and t...

Страница 18: ...outlet port item 7 a gas ballast control item 5 and a mode selector item 11 When the pump is switched off an inlet valve seals the inlet and prevents the suck back of air and oil into the vacuum syste...

Страница 19: ...fter a few minutes recheck the oil level and top up if necessary Refit the oil filler plug and tighten firmly by hand but do not over tighten 3 9 fitting the oil mist filter to the pump Unscrew the re...

Страница 20: ...eal filter washer over the top of the inlet port item 4 noting that the conical filter must be positioned downwards into the port Place the hose connector on top of the filter washer Fit the clamp aro...

Страница 21: ...hose connector on the inlet port of the pump Note that an additional clamp is not required because the vacuum will secure the hose to the hose connector Push the other end of the rubber hose over the...

Страница 22: ...lock The mains switch has an internal lamp and the equipment is powered when the lamp is lit Only connect to the supply specified on the Serial Number nameplate situated alongside the mains input conn...

Страница 23: ...em 1 to the mains outlet on the rear of the drier block The pump is switched on and off by the Vacuum Power switch on the front panel of the drier block This switch is marked O and I The switch is ON...

Страница 24: ...achieve maximum vacuum Rotate the mode selector item 11 fully anti clockwise to select the High Throughput mode Large Pear Drop Note that this control may be difficult to rotate Set the gas ballast c...

Страница 25: ...uum This setting MUST be used to achieve maximum vacuum Rotate the mode selector fully clockwise to select the High Vacuum mode Small Pear Drop Shown Rotate mode selector fully clockwise for High Vacu...

Страница 26: ...t the rear of the grinder using the supplied plastic hose Unscrew the oil filler cap then fill the lubricator with the correct grade of oil e g Shell Morlina 10 or Tellus R10 The top of the oil must b...

Страница 27: ...pressure when the unit is running pull the orange knob downwards then rotate the knob to achieve the correct pressure Push the knob upwards again after adjustment to lock the regulator setting The gr...

Страница 28: ...28 PET Plus User Manual 3 17 industrial grinder AMETEK recommends the Fritsch Pulverisette 15 This equipment connects to the mains using a standard mains lead Shown Fritsch Pulverisette 15...

Страница 29: ...Select Test screen will be automatically displayed after 3 seconds This screen is used to select one of the pre defined test set ups as shown later Press the key under EDIT to set the date time and t...

Страница 30: ...y under SET MINUTE Ensure that the time is set to UTC GMT and NOT to the LOCAL TIME Press the ENTER key to return to the UTC TIME screen To change the Date press the key under SET DATE To change the D...

Страница 31: ...Press the key under DATA FORMAT Each of the options toggle when the relevant key is pressed The STD DEV N has options of n and n 1 The Decimal Separator has options of Dot and Comma The ASCII Delimit...

Страница 32: ...t test set up screen Selecting Melt Temperature Up to 0 7 IV 284 C Above 0 7 IV 295 C 4 4 which test temperature to use Generally samples of IV up to 0 70 should be tested at 284 C and IVs over 0 70 a...

Страница 33: ...or a 20 thou die 0 0508cm The test set up called TRAINING sets the equipment into a special training mode and does NOT perform a melt test Note that the special training mode is only available if the...

Страница 34: ...ed When the required test set up is displayed press the key under EDIT to display the edit test screen Press the key under RENAME to display the rename test screen Press the key under CLEAR ALL to del...

Страница 35: ...isplayed press the key under CREATE to display the edit test screen Press the key under RENAME to display the rename test screen Press the key under CLEAR ALL to delete NEW_TEST then enter the require...

Страница 36: ...for this information To change a die dimension press the key under DIE LENGTH or DIE DIAMETER then enter the required values in cm This screen is used to define the pass fail feature At the end of ev...

Страница 37: ...word protected to prevent unauthorised changes by non technical personnel This feature also prevents any stored test data from being erased Display the Select Test screen Press the key under EDIT to d...

Страница 38: ...is pressed when the Select Test screen is displayed If the correct password is entered then the first Global Options screen is displayed otherwise the Select Test screen is re displayed Please contac...

Страница 39: ...key under or to select TRAINING Press the key under SELECT to display the Analysis screen This screen displays the requested barrel temperature the actual barrel temperature the nitrogen pressure wit...

Страница 40: ...until either the key under SELECT is pressed or the PC software is started The heaters are then active and the barrel will heat and maintain the required test temperature until the equipment is switc...

Страница 41: ...vertical column If the probe is not connected the warning screen below will be shown Also note that the intermediate screen shown below will be displayed if the barrel is not at the required temperat...

Страница 42: ...T THE BARREL IS CLEAN Fold a cleaning patch in two then place over the tip of the barrel cleaning tool Push the cloth into the top of the barrel using the tool and push the tool down completely throug...

Страница 43: ...taining nut with the end containing the O Ring facing upwards Screw the die retaining nut with the die to the bottom of the barrel and hand tighten using the tightening tool Loosen off by about 1 10th...

Страница 44: ...nto the top of the barrel n Press the key under GAS OFF to stop the flow of nitrogen gas n Insert the polymer into the top of the filling funnel n Remove the filling funnel from the top of the barrel...

Страница 45: ...ly switched to full pressure to perform the test The gas pressure inside the barrel is displayed on this screen If the required gas pressure is known testing a sample with a known IV then the pressure...

Страница 46: ...r will require a low gas pressure If the Probe Speed is below 0 5 the equipment will beep and display the screen below to request that the gas pressure is increased Increase the pressure using the pre...

Страница 47: ...sample degrades After 6 minutes of total test time the Calculated IV screen is displayed This shows the estimate of the actual IV and this also changes during the test as the sample degrades The scree...

Страница 48: ...at the pressure displayed on the screen is nominally zero Using heat protecting gloves remove the probe from the barrel and if necessary wipe any polymer from the tip Store the probe in the probe hold...

Страница 49: ...f silicone oil may be used to coat the barrel and make future cleaning easier warning The cloth and barrel cleaning tool may become hot during the cleaning process Wear heat protecting gloves when han...

Страница 50: ...l change when the die is clean Press the key under GAS OFF to release the gas pressure check that the display shows nominally zero then remove the top cap using the tightening tool 7 13 STORING THE DI...

Страница 51: ...t name ID and a Date Time ID that is created from the internal clock inside the equipment Therefore statistics can be calculated and displayed for each of the defined test set ups and the test data ca...

Страница 52: ...the data for any other test select the test using the keys Note that the inner 2 keys move through the data one test at a time and the outer 2 keys move through the data 10 tests at a time The screens...

Страница 53: ...ta can be exported using the supplied RS232 cable to HyperTerminal etc The RS232 protocol is 9600 Baud Rate 8 Data Bits 1 Stop Bit and No Parity To export the data press the key under EXPORT The test...

Страница 54: ...n method This test will ONLY give the same IV as the solution method if ALL moisture is removed from the polymer before testing less than 20ppm moisture The supplied granules must be dried for 16 to 2...

Страница 55: ...scopic materials and incorporates the following features 1 A temperature controlled heated block that has been machined to hold and heat six sample phials The temperature controller can control the te...

Страница 56: ...be required to get the best and most repeatable results 9 5 DRYING PROCEDURE Using a suitable container and laboratory balance weigh out 3 8g of polymer chip Pour the sample into a sample drying tube...

Страница 57: ...place in the storage areas at the sides of the polymer drier warning Hot tubes Wear Heat Protective Gloves Note that the plastic tubes MUST still be attached to the quick release connectors and the v...

Страница 58: ...stic vacuum tube so that the lever is in line with the vacuum pipe to release the vacuum A slight hissing sound will be heard as the vacuum draws hot dry nitrogen into the sample phial Press the key u...

Страница 59: ...sential 10 2 POLYMER DRIER The Polymer Drier has been designed for drying PET and other hygroscopic materials and incorporates the following features 1 A temperature controlled heated block that has b...

Страница 60: ...ts 10 5 USING THE POLYMER CHIP GRINDER The Polymer Chip Grinder is designed to grind polymer chips down to particles of either 1mm or 0 5mm using the supplied grinder bowls Davenport recommends only u...

Страница 61: ...cut masson cut or lace cut material and place into the grinding bowl with 0 5mm wide slits Place a clean receiving bowl under the funnel at the front of the grinder to collect the ground sample Place...

Страница 62: ...nding bowl until the level of the liquid is about 1cm or 1 2 above the remaining polymer chip level Allow the liquid nitrogen to just evaporate to dryness then lower the grinder lid and lock with the...

Страница 63: ...o adjust Rotate the relevant screw to set the unit as shown below A h 1 Set the dial to 0 82 to select 50 minutes Set the dial to 0 92 to select 55 minutes Using a suitable container and laboratory ba...

Страница 64: ...g the lever until it is in line with the vacuum pipe so that powder is NOT drawn up the plastic tube by the initial vacuum Wait for 5 minutes to ensure that a good vacuum is applied to the samples the...

Страница 65: ...vacuum pipe Press the release lever on the front of the quick connector so that the metal tube springs up out of the connector Note that the quick release connector has a sealing valve so that the va...

Страница 66: ...then carefully pour the powder from the phial into the top of the filling funnel Remove the filling funnel from the top of the barrel Insert a clean follower into the top of the barrel Insert the char...

Страница 67: ...his is a metal cylinder containing a central dispensing mechanism that splits the cylinder into 2 chambers Nitrogen is passed through the two chambers to purge any air from the device One chamber has...

Страница 68: ...spense a quantity of polymer into the container Weigh the dispensed polymer and check that it weighs 3 8g 0 1g If the weight is not correct the dispensing mechanism must be adjusted 11 4 ADJUSTING THE...

Страница 69: ...valve Do NOT remove the top or bottom caps Take the transfer vessel to the production area If a nitrogen supply is available at the sampling site either 1 Reconnect the nitrogen to the Schrader quick...

Страница 70: ...AS OFF to stop the flow of nitrogen gas Remove the bottom cap from the transfer vessel Place the bottom of the transfer vessel onto the top of the filling funnel Turn the dispensing lever until the le...

Страница 71: ...re that the top and bottom PTFE caps are a tight fit on the unit and that the sample melt pot is clean and dry Remove the top cap and using heat resistant gloves hold the pot under either a sample ble...

Страница 72: ...ny air that may be present Allow the gas to flow for a few seconds to ensure that the barrel is full of nitrogen Press the key under GAS OFF to stop the flow of nitrogen gas Remove the bottom plug fro...

Страница 73: ...mples The equipment must be used in accordance with the manufacturers instruction manual and ear protection must be used at all times in the vicinity of the grinding equipment Note that liquid nitroge...

Страница 74: ...LING LIQUID NITROGEN WHICH IS AT 196 C Leave the samples immersed in the liquid nitrogen until the liquid nitrogen has ceased to boil showing that the sample has been cooled to the correct temperature...

Страница 75: ...ke a vertical cut in the ring using a sharp pointed scalpel or Craft Knife Stretched O ring O ring reformed to correct size Shown Contraction Tool Shown Expansion Tool O ring Die warning Always wear c...

Страница 76: ...the old washer by levering it out via the slot cut into the top of the nut Place the new washer into the circular recess around top of nut and press down firmly until washer is evenly embedded 14 3 S...

Страница 77: ...encer Unscrew the brass silencer then pull out from the top cover Unscrew and remove the two 2 domed nuts and washers securing the top cover to the main lid assembly Lift the top cover away from the l...

Страница 78: ...grub screws in the motor pulley Loosen the motor securing clamp Pull the motor upwards and pull the pulley downwards until the pulley can be removed from the end of the motor shaft Remove the motor f...

Страница 79: ...peration and construction No form of regular maintenance is required except that the unit is kept in a clean condition 14 7 POSSIBLE FAULTS IN PRESSURE CONTROL SYSTEM LOSS OF PRESSURE 1 Gas cylinder e...

Страница 80: ...ed as shown below Loosen the grub screw securing the probe bush to the main body of the probe then unscrew and remove the probe bush Remove the probe rod and replace with a new one Re assemble the pro...

Страница 81: ...E Display the Select Test screen to display one of the pre defined test set ups Press the key under EDIT to display the edit test screen Press the key under GLOBAL to display the first Global Options...

Страница 82: ...mperature Fit the die to the bottom of the barrel then insert approx 2 grams of PET note Use Polythene instead of PET if using a mercury in glass thermometer PET will break a glass thermometer when it...

Страница 83: ...der ACCEPT to correct the measured temperature value If a calibration point had already been entered at 300C or approx this value a warning message will be displayed Press the key under OVERWRITE POIN...

Страница 84: ...ogen Gas is Off and also displays the measured pressure Check that the measured pressure is 0Bar 0 1Bar Note that the Zero reading can vary slightly with changes in atmospheric pressure If the measure...

Страница 85: ...the same as the reference pressure 0 1Bar press the key under CAL POINT to display the cal point screen Press the key under CHANGE TRUE then enter the pressure measured by the reference pressure gaug...

Страница 86: ...ipment MUST be left switched on for at least 15 minutes BEFORE performing this calibration The probe is calibrated by moving the probe rod a known distance then indicating this distance into the syste...

Страница 87: ...ed Press the key under OVERWRITE POINT to accept this new calibration point Press the ENTER key to return to the Probe Calibration screen Set the calibration micrometer to 25 000mm Check that the meas...

Страница 88: ...00mm Check that the measured probe is 25mm 0 01mm If the measured probe is not 25mm 0 01mm enter a new calibration point overwriting the previous point Reset the calibration micrometer to 0 000mm Chec...

Страница 89: ...xcel and or Microsoft Access 16 2 ADVANCED SECURITY The NEXYGEN Plus PET software has an optional Security and Audit Trail Feature which can be configured to prevent unauthorised personnel from using...

Страница 90: ...p wizard will be automatically shown Click on the NEXT button to proceed Select the I Agree option then click on the NEXT button Click on the NEXT button to proceed The dialog shows the default shared...

Страница 91: ...og shows the default program folder and this can be changed if required Select the Everyone option to create a Start Menu item for all users then click on the NEXT button to proceed Click on the NEXT...

Страница 92: ...ton A screen similar to that shown will be displayed while the VBA is automatically configured 16 4 CONFIGURING THE SOFTWARE CON SOLE Connect the supplied RS232 cable part number 09 0639 between the r...

Страница 93: ...ng the NEXYGEN Plus PET software Click on the CREATE A NEW BATCH OF TESTS button on the Welcome screen shown Note that if the Welcome screen is not displayed it can be displayed by clicking on the 9th...

Страница 94: ...temperature and the die dimensions as shown on the die certificate If sample identification is required for traceability of results a pre test dialog can be displayed to enter this information To def...

Страница 95: ...as required Click on the RESULTS tab then click on the PET Icon to display the available test results Click on the required result title e g IV Results to display the available results Select the req...

Страница 96: ...displayed as shown Select the required test file then click on the OPEN button Note that the above steps do not have to be performed if the test is run immediately after the test file has been defined...

Страница 97: ...ear of the vertical column If the probe is not connected the warning screen below will be shown Also note that the intermediate screen shown below will be displayed if the barrel is not at the require...

Страница 98: ...awn through the IV values and the IV at Zero will be calculated The selected test results will also be calculated and stored in the data table To perform the next test click on the NEW button at the l...

Страница 99: ...then select PROPERTIES to display the dialog shown Click on the LIMITS Tab at the top of the screen then set suitable PASS FAIL limits e g between 0 78 and 0 82 Note that BOTH limits MUST be defined C...

Страница 100: ...M charts can also be viewed Note however that 10 or more rows are normally required to view the XBAR RANGE chart because this normally groups the test results into groups of 5 rows Note that the XBAR...

Страница 101: ...Cp and Cpk values are calculated and are displayed at the left hand side of the chart The Default Sub Group size is 5 but this can be changed by selecting the Main Menu item of EDIT SPC SETTINGS as sh...

Страница 102: ...ing Bench mounting Enough bench space will also be needed for the optional computer key board and possibly printer Optional Computer PC compatible Optional software supplied on CD Probe Unit Linear Vo...

Страница 103: ...June 2011 Visit us at www lloyd instruments com The material in this document is for information purposes only and is subject to change with out notice While reasonable efforts have been made in the...

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