QUICK REFERENCE GUIDE HOT MELT DISPENSING This manual shows you how to set up an application for hot melt dispensing. The setup makes use of a VERMES MicroDispensing System with nozzle heater and cartridge heater. CAUTION! (High temperatures) The heaters you will use can reach temperatures of up to 180 °C. For such high temperatures there is a danger of severe burns and injuries. Use heat resistant gloves. General Introduction This manual explains step‐by‐step how to mount and work with an application for the dispensing of a reactive hot melt adhesive. It starts with the necessary parts and tools; followed by an explanation of how to mount the nozzle and cartridge heaters. The manual describes how to dispense and adds some tips and tricks about cleaning the system afterwards. Finally a selection of recommended further reading material is listed. Beware that some pictures might differ slightly from the actual product. For best results the dead volume of the media carrying channels should be as small as possible and be made of thermally similar materials to avoid temperature fluctuations. All parts are chosen so that they have a good heat conductance, but are also sufficiently heat resistant. For the same reason it is important to use a valve with air cooling. Since the internal control of the heater via MDC can only work with one heater, you will need an external heater control. You can use the heater control MHC 3001 (order no. 1012948) for one heater or the heater control MHC 3002 (order no. 1012949, see picture below) for two heaters and use it to control both heaters. The advantage of using the MHC 3002 for both heaters is that the possible minimum delay can be set shorter. ...
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Abbreviations HS – High Speed MHC – Microdispensing Heater Control LED – Light Emitting Diode NI – Nozzle Insert MCH – Microdispensing Cartridge Heater NL – Needle Lift MDC – MicroDispensing Control Unit NU – Nozzle Unit MDH – MicroDispensing Heater PTFE – Polytetrafluorethylene MDT – MicroDispensing Tool QRG – Quick Reference Guide MDV – MicroDispensing Valve TG – Tappet Guidance Parts Parts Ord. no. MDC 3200 1013015 MDV 3200A‐HS‐UF 1012986 Cartridge Heater MCH30‐230 1013388 (includes mounting base with cartridge air pressure force relief, see pictures below and next page) Heater MDH‐230tg 1013253 (needs Cable for Heater MCH‐230tg) 1013232 or ...
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Mounting base The mounting base is available in two sizes: The longer mounting base allows you to add a MCH High Temperature Adapter – HTA (order no. 1013387, see picture below) with optional cooling between valve and fluid box in the configuration. The high temperature adapter creates a barrier between the heated nozzle and the valve. This helps to get more stable dispensing results. All parts can be ordered separately as replacements: ...
Necessary Tools Tool Ord. no. Picture MDT 301 Universal Tool 1010208 MDT 302 Nozzle Adjusting Tool 1009289 MDT 303 Nozzle Insert Changing Tool 1007083 MDT 306 Torque Wrench Tool with Bit 1013334 Adaptor BitVM Set for MDT 306 Torque Wrench Tool 1013398 Hexagon Socket Key Set 1012993 IMPORTANT NOTE! Heat resistant gloves are strongly recommended. For cleaning purposes you will also need a non‐reactive hot melt. One example for a non‐ reactive hot melt which could be used is the 3M SW 3762 TC Q LOW MELT. VTK‐VS‐BA‐024e‐A Quick Reference Guide Hot Melt Dispensing ...
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Preparations First you have to fasten the valve (MDV 3200A‐HS‐UF) to the mounting base (see example picture). The valve is screwed to the base with two M4 hex screws, to a depth of 4 mm. You need the hexagon socket key size 3. M4 hex screws ...
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Mounting the Nozzle Heater Be aware that the pictures in this chapter might differ slightly from the actual product, especially if you use a MDH‐230tfr as nozzle heater. Step 1 Grease the O‐ring Heater‐fix thoroughly and push it onto the bearing MDH 230t‐fix. CAUTION! Make sure the heater is turned off in the control unit before you start. Step 2 Screw the bearing MDH 230t‐fix with mounted O‐ ring Heater‐fix onto the fluid box. IMPORTANT NOTE! The bearing MDH 230‐tf cannot be tightened. Screw it to the end of the endless thread. Step 3 Push the heater onto the bearing. The O‐ring has to fit perfectly into the bore. Please make sure that the position of the heating tube is correct as shown in the picture. Step 4 Screw the nozzle unit “NU MDH‐230tf fix” manually onto the fluid box. Screw it loosely for roughly 1.5 to 2 rotations. It shouldn’t be tight yet. Finally connect the heater with the heater control via a heater cable. ...
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With the nozzle heater mounted, the system should look like this: 8 Quick Reference Guide Hot Melt Dispensing VTK‐VS‐BA‐024e‐A ...
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Mounting the Cartridge Heater MCH30‐230 The next step is to mount the Cartridge Heater MCH30‐230 (see picture below). Upper end (will take the cartridge) Control Connector (for the Lower end (place over connection with heater controller) Luer‐Lock connector) 1. Place the cartridge heater with the lower end over the Luer‐Lock connector onto the fluid box (the control connector has to be on the side facing away from the valve, see picture). ...
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2. Insert your heat resistant cartridge (e.g. made of aluminum) into the upper end of the cartridge heater and screw it tight onto the Luer‐Lock connector. 3. Grease the two O‐rings, push the adapter of the cartridge air pressure force relief into the cartridge and turn it clockwise, until the end of the cartridge air pressure force relief snaps into the mounting base. 10 Quick Reference Guide Hot Melt Dispensing VTK‐VS‐BA‐024e‐A ...
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4. Finally connect the compressed air supply with the cartridge, but do not open it yet. The complete setup (just without the connections) can be seen in the picture below. In case a high temperature adapter is included, the lower part would look like this: VTK‐VS‐BA‐024e‐A ...
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Heater and Adjust After both heaters are mounted, turn the nozzle heater ON. This will allow the heater to reach a stable temperature at the nozzle for the adjust. Check the following table for the time it takes. Heating Time (s) Target at 230 V Temperature MDH‐230tg MDH‐230tfr (°C) 30 40 40 70 60 90 120 130 160 180 In the submenu “Heater Voltage” you can change the heater voltage between 110 V and 230 V to accommodate your local situation. (The current setting of the voltage is shown in the display of the MDC 3200 during startup. The results could be affected negatively, if these settings are not correct.) CAUTION! (High temperatures) ...
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Step 1 Bring the heater to the desired temperature. Wait a few moments for the system to settle in this temperature (see table on the previous page). Start the adjust by pressing the button [adj]. First of 500 pulses will be shot to prepare the valve for the adjust. Step 2 Screw the nozzle unit “MDH 230tf‐fix” upwards to the fluid box until the red light is ON. Use the tool MDT 301 (because of the working heater, MDT 302 cannot be used). The display shows a value of about 1100 or a little more. CAUTION! Please ensure that the tappet guidance “H” and the nozzle insert were mounted properly into the nozzle adjustment nut. Step 3 Screw the nozzle unit slowly away from the fluid box until the red light is off. The value shown in the display should be in the range of 985 – 1000. CAUTION! If the value is not stable or falls rapidly (within approx. 5 sec), the adjust has to be repeated. Begin again at step 1. ...
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Hot Melt Dispensing After you have finished the adjust, you can turn ON the cartridge heater to heat up the cartridge with your reactive hot melt. As with the nozzle heater, it will take some time until the targeted operating temperature is reached (depending on setup, medium and target temperature this can take 10 to 20 min). IMPORTANT NOTE! Maximum possible temperature for these heaters is 180 °C. Once the operating temperature is reached, you can open the compressed air supply and set the supply pressure. Now you can start to dispense your hot melt application. When dispensing with a defines number of pulses or in infinite mode, the result could be clean lines as in the picture below, which shows an example with a reactive hot melt dispensed on a glass substrate. Keep dispensing till you have finished your project. 14 Quick Reference Guide Hot Melt Dispensing VTK‐VS‐BA‐024e‐A ...
1.10 Dismounting and Cleaning 1.10.1 Removing the Reactive Hot Melt Before you switch off the system, you want to make sure to empty it of the rest of the reactive hot melt adhesive: 1. Turn down the cartridge heater to 60 °C. Wait until the temperature has reached this level. 2. Screw off the cartridge with reactive hot melt and remove it. 3. Screw in a cartridge with non‐reactive hot melt as a cleaner. 4. Increase the temperature to 90 °C. 5. Set the number of pulses in the parameter settings to ca. 15000 pulses. 6. Keep dispensing until the rest of the reactive hot melt is removed from the system. 7. Turn off the heaters. IMPORTANT NOTE! There will be a remainder of the non‐reactive hot melt left in the system. When you re‐start the application again without cleaning, you have to dispense long enough with the reactive hot melt to clear this remainder from the system, before you can begin with the application. 1.10.2 Dismounting If you want to dismount the setup completely, make sure everything is turned off. You have to wait long enough for the heaters to cool down sufficiently, before you go on. Essentially you work in reverse order from the mounting. 1. Disconnect the air supply. 2. Disconnect both heaters. 3. Turn the cartridge air pressure force relief counter‐clockwise to disconnect it from the mounting base. 4. Pull the cartridge air pressure force relief off of the cartridge. 5.
1.11 Further Reading You should also check the following manuals for further and more detailed information. They can be found on the manual CD which came with your MDS delivery or can be downloaded from the VERMES Microdispensing homepage at www.vermes.com. To download a manual you will need a password which you can obtain by contacting our 0support via email (support@vermes.com) or via phone (+49 (0) 80 24 6 44‐26). User Manual MDS 3200 Manual MHC 3001‐3002 Quick Reference Guide Heater MDH‐230tf/tg – Mounting and Adjust Mounting Instruction Tappet Sealing LX (if you decide to use a tappet sealing LX) Quick Reference Guide Cleaning and Mounting 1.12 Index 3M SW 3762 TC Q LOW MELT 5 M4 hex screws 6 Abbreviations 3 manual CD 16 adjust 12 Maximum possible temperature 14 air cooling 12 MDT 301 See Universal Tool aluminum 10 MDT 302 See Nozzle Adjusting Tool BitVM Set 5 MDT 303 See Nozzle Insert Changing Tool cartridge heater See Cartridge Heater MDT 306 See Torque Wrench Tool MCH30‐230 MDV 3200A‐HS‐UF 3 Cartridge Heater MCH30‐230 9 MHC 3001 2 ...