MJ

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• Commented on Calculating Cooling Time...
  Andy, Vertical lines is used therefore because you can't count ln with negative number. Vertical lines make number positive, so you can calculate ln-natural logarithm. Best regards Milan...
• Commented on Moving a Mold from One Machine to Another...
  Andy, I used same scale for both machines. I measured just parts without runners. What I can't say, if diameter of nozzle was same. Could nozzle be a root cause? Milan...
• Commented on Moving a Mold from One Machine to Another...
  Andy, For clarifing: Yesterday I tried to run one mold on machine B, and I adjust all injection parameters according parameters from machine A. Firts I scaled my parts from machine A which were taken without hold pressure. They were...
• Commented on Moving a Mold from One Machine to Another...
  Andy, I have tried move mold from machine to different machine today. I took samples without hold pressure and with hold pressure. I tried the replicate process on different machine. I adjusted the same fill time and all needs parameter...
• Commented on Complications With 1st - 2nd Stage Transfer...
  Andy, Here is question coming up. What is better, fill parts to 98% slowly (out of knee of curve) to avoid overshoot, or adjust shot size, that you will have parts less than 98% full during first stage. Milan...
• Commented on Understanding the Dynamic Load Sensitivity Test...
  Hello Andy. Whe I'm doing airshot in load sensitivity test, is it good to do with plastic material in barrel or without? I did a test, and result of injection pressure between with material and without material was about 230...
• Commented on Can A New Machine Reduce Injection Pressure?
  Andy, Machines suppliers take care about machines not about process. I don't like machines, where I can't adjust process how I want. So many limitations. Milan...
• Commented on Can A New Machine Reduce Injection Pressure?
  Andy, How does machine know if my parts are completely full, that reduce clamping force? Milan...
• Commented on Comparing Machine Capabilities...
  thanks Andy. Milan...
• Commented on Comparing Machine Capabilities...
  Andy, When I did airshot, injection time was 0,6 sec. MJ...
• Commented on Comparing Machine Capabilities...
  Andy, I tryed start filling slowly and then increase, but same result. I tryed adjust just 60mm/s. Fill speed on begining was stable but when injection pressure started increase (parts 70% full) then machine decreased injection speed. Over the 60mm/s...
• Commented on Comparing Machine Capabilities...
  Hello Andy. I did it exactly you said. But technician said: In first portion of injection, increasing injection pressure is too high and machine start to limit the injection speed due to machine design to avoid problem with electric motor....
• Commented on 6-Axis Robotics For Injection Molding...
  Hello Andy. I had one 6-axis robot ABB, and its accuracy was very good 0,05mm repeatable. But problem is, when you want to use 6-axis robot for inserting molding, because they have a problem with axis releasing during loading the...
• Commented on Results of Screw Wear...
  Andy. When screw becomes worn, screw recovery time will increase? Milan...
• Commented on Screw Flight Diameter Along the Screw
  Hello Andy. Which kind of process parameters vary when screw becomes wear. Milan...
• Commented on Packing With High Pressure Molding
  Andy, I had just pressure sensor at EOF. But I adjusted V/P by position of screew regards on presure at EOF. With electric Demag it works very well, standard deviation for cushion 0,07 mm. Milan...
• Commented on Packing With High Pressure Molding
  Hello. I used for producing thin wall parts DIII process. It's very stable. With second injection speed, used for packing, you can adjust pressure at transfer to hold pressure. Milan...
• Commented on Procedure for Measuring Screw Wear
  Andy, I measured diameter of screw today, but more wear was on metering zone than on feed zone, why? Is it normal? Milan...
• Commented on Procedure for Measuring Screw Wear
  Hello Andy. Does the new screw have to same diameter in front, middle and back? Milan...
• Commented on Machine Variation vs. Process Variation
  Hello Nathan. From my experience LCP materials need special screw. Do you have it? Milan...
• Commented on Compressive Stress vs. Orientation Stress
  thanks Andy, now it's clear Milan...
• Commented on Compressive Stress vs. Orientation Stress
  Andy, You said: Tensile stresses are typically caused by the chains being pulled apart. This often results in defects such as a void. What pulled chains apart? Underpressure? Milan...
• Commented on Compressive Stress vs. Orientation Stress
  Andy, I know, that molecules moved to be closer to eachother and this is reason why tensile stress creating. But, they are moving closer due to pressure decreasing or due to cooling material in cavity? Milan...
• Commented on Compressive Stress vs. Orientation Stress
  Andy, Is it true, that when I want to reduce tensile stress I have to increase compression stress? It means push more material in cavity. Milan...
• Commented on Optimizing Screw Recovery...
  Andy, Is the influence of feed zone temperature on screw recovery time lower when I use machine with shot size below 20% of maximum? Best Regards Milan...
• Commented on Optimizing Screw Recovery...
  Andy, Are you measuring melt temperature during feed zone optimization to be sure, that you are in supplier range? Milan...
• Commented on Optimizing Screw Recovery...
  Andy, During this test you have nozzle, front, middle temperature in flat profile right? Milan...
• Commented on Optimizing Screw Recovery...
  Hello Andy. When I'm increasing rear zone temperature from lowest, screw recovery time should increase or decrease? What is your experience? Milan...
• Commented on Optimizing Screw Recovery...
  thanks Andy Milan...
• Commented on Optimizing Screw Recovery...
  Hello Andy. I used during feed zone optimization back pressure 70 bar plastic according John Bozzeli recommendation. Is it good way to do this? Milan...