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Pressing Emax Press in Jelrus Universal EXPress

Discussion in 'Fixed' started by 2th-man, Jan 19, 2009.

  1. 2th-man

    2th-man New Member

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    Hello,
    I am new to this forum and I hope I do this right.

    I am a new user of Emax Press and do not have an Ivoclar pressing oven.
    They only give pressing parameters for their ovens. How long should I press once the oven reaches its high temp? Any other things I might need to know since I am not using an Ivoclar over?
    Thanks for the help. Tim:)
    Last edited: Jan 19, 2009
  2. Al.

    Al. Well-Known Member

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    Hey Tim, Welcome I have Ivoclars furnace and mine is preset so I never paid attention to specific parameters. Are you taking about the hold time before it presses?
    Here is what my manual says.
    1292 F to 1679 F, temp increase 108 F per min., 15 min hold time(small ring)
    25 min hold time(large ring), vacumn start at 930F. And then it says A 300, I dont know what that stands for, mabey pressing pressure?

    It says that when using other furnaces the temp may deviate as much as 50 degrees F +/-.
    LabGuy presses the emax ingots using a whipmix furnace mabey he can tell you his temps and holding time.
  3. sixonice

    sixonice New Member

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    I think we can help you out with your problem. Al is right on telling you to raise your temperatures. Competitor ovens other than the Ivoclar presses seem to be on the cold side. You may go through 5 or 6 ingots dialing things in, but with a little patience, you can get the pressings to work. If you get heavy reaction layers on the e.max (finning, flash etc.) your too hot, drop the high temp 10C (you can also try a 15 minute hold). If the pressing comes up short (margins) the press is cold. Bump high temp 10C. Try these in your oven first though:

    BASE TEMP: 700C
    HIGH TEMP: 945C
    RISE PER MIN: 60C
    HOLD: 20 minutes
    VACUUM LEVEL FULL: You want the press to pull vacuum the ENTIRE pressing program!!!!!
    AIR PRESSURE: 82lbs (if the Jelrus has that option)
  4. JohnWilson

    JohnWilson Moderator Staff Member

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    I also believe the emax programs on the Ivoclar ovens have something special associated to how the press starts and stops or the lack of that. I know they tell you to program it on the Ep500 on a program number above 14 I think.

    I think it has something to do with how the glass reacts while pressing but its been a while since I had the convo with the rep.

    I think a call to Ivoclar tech would be in order.

    Good luck
  5. 2th-man

    2th-man New Member

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    Thanks for all your help.
    I called Ivoclar and talked to Ernie in the tech dept. but he wasn't able to help me with the Jelrus oven, since their oven doesn't press based on time, but has sensors that tell the oven when to automatically finish the press.
    I will take your input and start the trial and error process. As I do this I am sure I will be back with more questions.
    Thanks, Tim
  6. Al.

    Al. Well-Known Member

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    What did the tech at Jelrus say??
  7. TheLabGuy

    TheLabGuy Just a Member

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    Yeah, what Al said, call the manufacture of Jelrus (Jensen????), they well tell you.
  8. aidihra
    Stressed

    aidihra Member Donator

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    I just started experimenting with Emax press without the Ivoclar pressing furnace. My local Ivoclar rep gave me some samples to try for free, but told me he can't sell me the product unless I purchase their furnace. Of course, he also told me that we can work something out if I really like the product. I have the CeramPress™ Qex Porcelain and Pressing Furnace and I've been using Jensen's CP pressables with not many satisfactory results. I've went through 3 Emax ingots before I figured out the proper pressing temperature. I make my pressables like a coping and add porcelain to the facial surfaces. I made 2 Emax crowns that I am happy with so far.
  9. biodentg
    Relaxed

    biodentg Member

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    Hi Aidihra Can you please let me know what parameters are you using for emax?? I also have #2 QEX Press ovens and I will be using emax soon. Based on parameters written by sixonice before, the pressing time is missing..

    BASE TEMP: 700C
    HIGH TEMP: 945C
    RISE PER MIN: 60C
    HOLD: 20 minutes
    VACUUM LEVEL FULL: You want the press to pull vacuum the ENTIRE pressing program!!!!! OK
    AIR PRESSURE: 82lbs (if the Jelrus has that option) mine is at 4.5 psi


    Thank you very much for your time


    Jorge
  10. sixonice

    sixonice New Member

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    Your right! I did forget the pressing time. Generally, and depending on what your pressing pressing times vary between 8 - 10 minutes. Set your pressing time to 9 minutes as the benchmark, and see how your results are.
  11. PGguy

    PGguy New Member

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    my specs for e-max are...

    Small ring:
    700 base temp
    915 high temp
    60 rise temp/min
    15min hold time
  12. PGguy

    PGguy New Member

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    my oven is the 600 combi Ivoclar
  13. Ceramic Studio

    Ceramic Studio New Member

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    Emax

    I have been using the Zubler Vario Press 300 Furnace with Argibond SpeedVest and have had no prblems what so ever. Hope that helps.
  14. finnster68

    finnster68 Yep im an Aussie

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    Ceramic Studio. Have you tried Ivoclars PressVest Speed?

    Im in AUS as well and have not thought of trying the Argibond speed investment.

    How is the reaction layer with that investment?

    Cheers
    Tony
  15. Ceramic Studio

    Ceramic Studio New Member

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    Hi Finnster68. Yes we have tried the IPS PressVest Speed we found no real difference with the reaction layer.

    The only difference is its 1/4 the price. Argibond speed Vest is a pressing Investment.

    Give it a try.

    Cheers
    Ben
  16. finnster68

    finnster68 Yep im an Aussie

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    Ben

    Cheers might give it a run :)

    Tony
  17. finnster68

    finnster68 Yep im an Aussie

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    Ben

    What liquid / water ratio you using for the Argibond Speedvest.

    I got some samples to try (60g) so will have to use 2 bags lol but just wondering what ratios your using.

    Cheers
    Tony
  18. Ceramic Studio

    Ceramic Studio New Member

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    Hey Finnister

    The ratio i have been using is for a 200gm Ring is 4 Bags speed Vest (240gm)
    to 64 ml Speed vest liquid no water. 25 mins Setting times then in furnace at 850 for 1 hour.

    We have done 12 or so using that formula both full wax up and copings we have had no problems with expansion or reaction layer but we are using a Zubler furnace.

    Cheers Mate let me Know how you go
  19. finnster68

    finnster68 Yep im an Aussie

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    Ben

    Thanks will give it a run tomorrow.

    I have the EP3000 from Ivoclar so hopefully it works as well as your Zubler with this investment.

    Most other investments i have tried have produced a horrendous reaction layer :)

    Cheers
    Tony
  20. aidihra
    Stressed

    aidihra Member Donator

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    I haven't used emax for 5 months (I've been using SwissNF). The press time I used was 10min.

    Sorry for the late response.

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