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Lab talk, the good, the bad, and the ugly
All Porcelain-Press
Dialing in pressing oven.
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<blockquote data-quote="Patrick Coon" data-source="post: 235855" data-attributes="member: 11366"><p>Couple thoughts:</p><p></p><p> 1. Check burnout oven calibration and that it is at 850C/1562F and that the ring is in the furnace a full 45-60 minutes after it recovers (single 100gr ring). Also your burnout and press furnaces should be close together, so it doesn't take you more than 30 seconds to get the ring from burnout oven to pushing start on the pressing oven.</p><p></p><p> 2. Raise your pressing pressure to 5-6 bar (75-90 psi)</p><p></p><p> 3. Since reaction layer was "minimal" raise your high temp 5C. Older furnace may not be very well calibrated.</p><p></p><p> 4. 5.5 minutes press time should be long enough to press just about anything.</p><p></p><p> 5. Phantom or Blind sprue is used when you have either a very thin restoration (0.3mm - 0.4mm) or a very light pattern (0.2gr - 0.3gr) and the material will be flowing very slowly. But this is only really needed when you have a furnace that has a speed sensor for plunger travel (Ivoclar ovens),as they go by a set plunger speed to determine when the pattern is full and not a set press time.</p></blockquote><p></p>
[QUOTE="Patrick Coon, post: 235855, member: 11366"] Couple thoughts: 1. Check burnout oven calibration and that it is at 850C/1562F and that the ring is in the furnace a full 45-60 minutes after it recovers (single 100gr ring). Also your burnout and press furnaces should be close together, so it doesn't take you more than 30 seconds to get the ring from burnout oven to pushing start on the pressing oven. 2. Raise your pressing pressure to 5-6 bar (75-90 psi) 3. Since reaction layer was "minimal" raise your high temp 5C. Older furnace may not be very well calibrated. 4. 5.5 minutes press time should be long enough to press just about anything. 5. Phantom or Blind sprue is used when you have either a very thin restoration (0.3mm - 0.4mm) or a very light pattern (0.2gr - 0.3gr) and the material will be flowing very slowly. But this is only really needed when you have a furnace that has a speed sensor for plunger travel (Ivoclar ovens),as they go by a set plunger speed to determine when the pattern is full and not a set press time. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
All Porcelain-Press
Dialing in pressing oven.
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