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 Resin in upper joint
Author: klarisa 
Date:   2019-11-16 00:20

Something new in Selmer clarinets. No more cracks?
https://www.selmer.fr/instruinfo.php?page=NEW&famille=SELMER%20CLAR&LANGUE=en&fbclid=IwAR132X9Y6-K2DsG488whnWhk4TyKQdP1skp7NR9Vaw-ptF77vjizLwA0EUw



Post Edited (2019-11-16 00:20)

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 Re: Resin in upper joint
Author: Paul Aviles 
Date:   2019-11-16 01:40

Gee I'd like to hear a more detailed description than what Selmer is currently posting. It almost sounds like the plastic lining that Rossi uses for a portion of the top joint. Plastic pen barrels are often referred to as being "resin."




.................Paul Aviles



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 Re: Resin in upper joint
Author: Chris P 
Date:   2019-11-16 02:20

https://www.selmer.fr/instruinfo.php?page=NEW&famille=SELMER%20CLAR&LANGUE=en&fbclid=IwAR132X9Y6-K2DsG488whnWhk4TyKQdP1skp7NR9Vaw-ptF77vjizLwA0EUw

Yamaha have been offering their 450 series clarinets with resin lined top joints for a while now with their Duet+ models.

https://uk.yamaha.com/en/products/musical_instruments/winds/clarinets/ycl-450m/features.html#product-tabs

It's not a new thing in the bassoon world to have ebonite or resin lined descending bores (necessary with maple instruments) and oboes with partial or fully lined top joint bores (or resin lined upper and lower joint bores as Schreiber have been doing on their student model oboes for decades), but clarinets are relative latecomers to this feature.

Selmer had been using ebonite lined barrels on their 10G clarinets. I don't know if any of their other models had that feature until this current model.

Chris.

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 Re: Resin in upper joint
Author: Tony F 
Date:   2019-11-16 03:38

From the product description I suspect that this may not be the process of lining the joint with ebonite, but one of impregnating the wood with some form of resin under pressure and then machining the bore to size. This method of stabilising the wood has been used for many years in the furniture and floorboard industries and the technology is well known and understood.

Tony F.

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 Re: Resin in upper joint
Author: Paul Aviles 
Date:   2019-11-16 07:10

My brain went to that idea first, but they say the bore is sized larger. That wouldn't be necessary if the billet were treated somehow. Of course we have determined on this board that African Blackwood is so dense that even oil over a long period of "soaking" will NOT penetrate much further than the surface.





................Paul Aviles



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 Re: Resin in upper joint
Author: Tony F 
Date:   2019-11-16 20:09

Paul,
What I think they mean is that the upper joint bore is slightly oversized and that the resin impregnation process build up the bore surface, which is then reamed to the correct size. As for penetration, remember that oil soaking relies on the oil wicking into the wood under normal atmospheric pressure whereas the impregnation process I mention is done by first removing any air within the wood by means of a vacuum process and then applying the resin under extreme pressure. I've used this process industrially and it is extremely effective, resulting in a dense structure with the characteristics of timber but greatly enhanced wear qualities. Of course this is pure speculation and I reserve for myself the right to be wrong.

Tony F.

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 Re: Resin in upper joint
Author: MichaelW 2017
Date:   2019-11-17 22:21

Interesting that Selmer use some sort of "resin", (maybe Epoxy), with the supposedly toxic bisphenol replaced by something from "biomass", while Yamaha use the thermoplastic ABS (which, btw. is not exactly "state of the art", but used widely for decades).



Post Edited (2019-11-17 22:29)

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