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Posted by phil-news-nospam on 01/10/06 09:03
In alt.video.dvd.tech Bill Vermillion <bv@wjv.com> wrote:
| I know there is no carbon black in CD/DVD production. I was
| talking about the time I was in a pressing plant and I did refer
| to 45s and LPs. It's amazing how good records sounded when you see
| the way they are made with so much hand labor.
|
| Slap the label down, put on a hunk of black plastic, lower the
| stamper while you inject steam into the plates backing the
| stampers, let it sit for about 7-10 seconds, hit the cold water too
| cool the plastic, raise the stamper, lift out the disk.
|
| If you didn't let it sit long enough or get it hot enough you got
| 'non-fill' where the plastic did not go fully into the grooves
| which gave you a noisy recording because of the small air-spaces
| that never got plastic.
So maybe that's what the big record manufacturers like RCA were doing
wrong. Probably letting it sit for 3-5 seconds to up the production
rates. That and the "debris" often found molded in. RCA was the worst
I encountered, but many others were fairly bad (even DG at times).
--
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| Phil Howard KA9WGN | http://linuxhomepage.com/ http://ham.org/ |
| (first name) at ipal.net | http://phil.ipal.org/ http://ka9wgn.ham.org/ |
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