Test and experimental records 10" 12" and 7" early injection molded discs
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- Опубликовано: 12 май 2024
- Injection molded test and experimental records from Geon L.T.D to include 3 speeds and 3 sizes possibly unique and one off moldings, If anyone has any more info or ideas please add them in the comments.
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![Skilla Baby - Misfit (Feat. Polo G) [Official Video]](http://i.ytimg.com/vi/IjsylSnNMyw/mqdefault.jpg)
I presume the surface noise you refer to is a kind of dull roar. The plastic has 'relaxed' over the years causing a rippling of the surface. Very early vinyl lps ( particularly EMI) suffer from this.
These records probably sounded much better when new. An interesting evolutionary dead end!
Why would vinyl plastic "relax"? I have a number of early lps produced by the companies in the EMI group and they sound astoundingly good after 70 years plus.
@@SwingBandHeaven a slug of semi-solid vinyl is forced between the platens of a 20 ton hydraulic press. The pressure needed to do this is indicative of it's reluctance to yield to the forming process. Over time the material will tend to want to return to it's original form. This is common in thermosetting plastics, especially if the temperature was too low during forming.
The same is true of cast metal (which is also a thermoplastic in the true sense of the word). Critical castings are often seasoned for many months prior to machining owing to their tendency to 'spring' or 'relax.'
Conversely chemoplastics show a tendency to shrinkage over time.
I have a few EMI lps of the early fifties with very bad rippling of the surface. Early Decca 'pancake' pressings don't seem to suffer the same problem.
Just my thoughts on 40 years of record collecting and a past career in maintaining injection moulding equipment.
@@SwingBandHeaven I left an unnecessarily detailed reply about the "memory" of moulded plastics which vanished into oblivion. Trust me. It's a thing. lol
is that turntable still for sale? I like them both especially that little "walkman" version!
Injection-molded records date back to the 1950's. They were made of poly styrene, not vinyl. Poly vinyl chloride is what vinyl records are made of.
Many thanks for the information
ID like to own that Harry B disc
Hi enjoying the video, I have a couple of Pye Nixa 78rpm 10" records by Lonnie Donnegan which are plastic based and not shellac I wonder these where injection moulded or standard vinyl pressed ?
Yes I have a few as well, this could be the case, there is a connection with Pye and Geon if not injection molded they still may have well been experimenting with the plastic type formula.
Non - shellac Pye / Nixa / Top rank / Mercury 78s were pressed vinyl
Polystyrene is about the least suitable material to make records from. Silent surfaces at first but after relatively few playings (even with a light weight pick up) and it very quickly becomes very noisy. Why on earth anyone though they were a good idea is beyond me.
Nice turntable. How much did that set you back at the thrift store? $10?
The hacker record player cost me £10 the little Philips one cost me £5 and the records cost me £15