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MAPP Plastics Discussion Forum

The MAPP Plastic Industry Discussion Forum allows members to rapidly communicate with each other. Post both questions and answers to questions that other MAPP members have about any industry topic from material and process issues to R&E Tax Credits and other business issues.

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Posted:  21 Aug 2014 17:09
We currently have hydraulic injection molding machines but are looking at all electric machines as replacement machines.  We mold a wide variety of materials that include engineered grade materials that are viscous and require high injection pressures in the 23,000 psi range of plastic intensification.  I was wondering if anyone has experience molding such materials using an all electric machine?  If so, would you please provide feedback in regards to how the machine handles molding such material.  Is the machine capable of reaching the high end of injection pressure?  How does the machine respond with high hold pressures and long hold times in the 20 to 30 second range? Do you have any issue with the motors overheating?  I would appreciate your responses.

Sean
Posted:  27 Aug 2014 16:53
Sean, we've been using all electic presses for a number of years.  In fact, we have been altering our strategy to implement the use of more hybrids for many different reasons.  If you want to call my cell phone at 317-370-1964.  Also, you have an open invitation to visit my plant in Indianapolis and talk to my staff.

Let me know what we can do to help!

J.R. Spitznoggle
President
Global Plastics
Posted:  02 Sep 2014 14:51
Sean, we too have some all electric presses but we now only buy hybrid presses. The electric machines are great but we see issues when running hot runner tools where the nozzle touch force is not adequate and the hybrid provides the power we need with the benefits of the servo which give us shot to shot control, energy savings etc.

Joey
Posted:  02 Sep 2014 16:46
Joey, we have been hearing about similar issues with contact force on all electric machines.  Because of this we have been looking at hybrid machines.  If you wouldn't mind, I would like to speak with you more about the hybrid machines.  My e-mail address is sean_whalen@bullard.com.

Thanks,
Sean
Posted:  02 Sep 2014 17:54
We have been switching to electric presses over the last 10 years.  We see a lot of advantages but long hold times relative to the cycle time can burn out the amplifier for the servo motor.  The issue varies by brand.  My understanding is that some brands have water cooled amplifiers; but for most it's the size (rating) of the amplifier vs the load.  We had trouble with our Nissei electrics, but the Toshibas have been good so far.  We've only been running the long hold time jobs for about 2 1/2 years, not a single problem yet with the Toshibas.  Our hold times can be as long as 120-150 seconds.  If you have any further questions, feel free to email me.

Rick
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