ml1@homxa.UUCP (M.LAMPELL) (07/16/84)
I have a prized record that is slightly warped (by the sun). I would like to straighten it out enough to be able to make a tape of it. Has anyone had any experience doing this? My best idea so far is to clamp the record tightly between two pieces of glass, and put it out in the sun again. Any ideas on what effect this would have? Maurice Lampell ..ihnp4!homxa!ml1
marcus@pyuxt.UUCP (M. G. Hand) (07/18/84)
The problem is that the vinyl problem is essentialy a super cooled liked - there is little order to the material, because it was pressed and chilled. When it is heated, the molecular chains begin to slide across one another and gradually arrange them selves in less energetic positions (ie the material tends to equilibrate). This means that the warping is the obvious manifestation of what is going on at a sub-microscopic scale - the shapes of the groove walls has also deformed. Unfortuantely you'll never be able to restore your disk to its former glory even if you actually mangae to flatten it, because the cutting has been degraded. marcus hand (pyuxt!marcus)
did@ucla-cs.UUCP (07/18/84)
Putting it back in the sun may embed dirt/dust particles in the grooves and ruin the record. The best thing to do is to stack it with your other records at 90 degrees, and let time take it's course. Dave ARPA: did@UCLA-LOCUS.ARPA UUCP: ihnp4!ucla-cs!did
hgcjr@utastro.UUCP (Harold G. Corwin Jr.) (07/18/84)
I tried this same trick a few years ago, and it worked pretty well. Rather than clamping the glass plates, however, I weighted the package down with large books to more evenly distribute the pressure. After letting it sit on sun-heated concrete for a couple of hours, I put the whole stack, books and all, on the kitchen counter overnight to let the record cool slowly. By the way, make sure that the glass is CLEAN. It hasn't happened to me yet, but I suspect that one could press dust right into the record this way. Good listening! Harold G. Corwin, Jr. uucp: {ut-sally,ut-ngp,noao,charm}!noao!utastro!hgcjr arpa: utastro!hgcjr@ut-ngp mabell: 512-471-4461 X 463 Dept. of Astronomy, RLM 15.308, Univ. of Texas, Austin, TX 78712-1083