The Secret Society of Lathe Trolls

Hi montalbano,

Thanks for your help. Well, i will check the heat exchange efficiency of cooling water.

CK

As I mentioned before the centre of record I pressed will gradually rise up a bit after I put it on a flat surface for cooling and finally become dishing much more than 0.1 – 0.15mm. The connection of pipes to the mold for steam / water has been checked and all are following the markings shown on th...

Yes, the mold is from RPA.
The thickness of label area and edge of the record has been measured before. Label area only 0.1 - 0.15mm thicker than record edge. Is it a significant factor to cause dishing?

Thanks for your advices! The mold I am using is a new mold which supplied from US. The piping of steam/water of my system has been inspected and all looks fine. The problem I am facing is that the centre of record will gradually rise up a bit after I put it on a flat surface for cooling and finally ...

Yes, I mean an absolutely flat vinyl record. I am in Hong Kong. The press I am using is a 150tons hydraulic press which developed by myself. The thickness of both side stampers is controlled to around 0.25mm. The output steam pressure from the boiler is set to around 11bar. Thanks in advance for sha...

Hello, i am a beginner in vinyl pressing and facing some difficulty in pressing process.

The problem is that slight dishing may be happened after cooling. Is somebody in this Forum able to share experience of how to make an absolute flat vinyl?

Thanks!