Welcome to one of the most active flamenco sites on the Internet. Guests can read most posts but if you want to participate click here to register.
This site is dedicated to the memory of Paco de Lucía, Ron Mitchell, Guy Williams, Linda Elvira, Philip John Lee, Craig Eros, Ben Woods, David Serva and Tom Blackshear who went ahead of us.
We receive 12,200 visitors a month from 200 countries and 1.7 million page impressions a year. To advertise on this site please contact us.
|
|
RE: Roasted spruce
|
You are logged in as Guest
|
Users viewing this topic: none
|
|
Login | |
|
Ruphus
Posts: 3782
Joined: Nov. 18 2010
|
RE: Roasted spruce (in reply to Tom Blackshear)
|
|
|
Tom, This man could know where specifically treated spruce might be available: Dr.-Ing. Alexander Pfriem, Tel. 0351 463-39181 E-Mail: alexander.pfriem@tu-dresden.de While I was googling for his contact data for you, me came across two detailed descriptions, which could be informing for those interested. This Wiki-article on basics: https://en.wikipedia.org/wiki/Thermally_modified_wood Saying treatment makes wood more durable, less receptive to humidity / swelling / warping / cracking and to temperature fluctuation. Drawback: less sturdy in construction statics. And that it turned out positive for instruments quality. On the later, following link: https://idw-online.de/en/news205800 , which I just sent through a translating mashine. quote:
Thermowood improves the acoustic properties of musical instruments - Friedrich-und-Elisabeth-Boysen-Förderpreis 2006 awarded Kim-Astrid, Magister Press Office Technical University Dresden In his dissertation, Alexander Pfriem from the Institute for Wood and Paper Technology of the TUD investigated for the first time the use of thermally modified woods in the construction of musical instruments - with success. The environmentally friendly material, which makes the use of tropical woods largely superfluous, also improves the sound of the instruments. For this, the scientist was awarded the Förderpreis der Friedrich-und-Elisabeth-Boysen-Stiftung 2006 in Dresden last weekend. What is the difference between the darker thermo wood and normal wood, and how is it made? Wood consists essentially of three components: cellulose and lignin, which are responsible for the compressive and tensile strength of the material, and hemicellulose, which binds the other two substances together. If wood is now heated to 180-220 ° C with oxygen being excluded, this third component is primarily mined; the short-chain sugar molecules crystallize out. Due to the degradation of hemicellulose the docking points for water are missing; The wood swells and shrinks less and is less prone to wood consuming organisms. However, as the heating time increases, the strength properties also decrease more and more. The corresponding procedures were originally developed and patented in Germany. Since the mid-nineties, thermo wood has been used in various European countries primarily as weather-resistant facade and floor wood. Since heating also changes the acoustic properties of the wood, thermo wood should also be of interest to the musical instrument industry, thought dr. Awl. In a joint project with the Institute for Musical Instrument Making Zwota, which was funded by the Association of Industrial Research Associations (AiF), he investigated the material behavior of thermally modified woods, their damping and elastic properties. A musical instrument maker made a series of guitars with thermal wood ceilings, and the instruments were characterized, tested and evaluated in a cooperation of the TU Chair Wood and Fiber Material Technology with the Institute for Musical Instrument Making in Zwota. Result: the acoustics of the wood are significantly improved by the thermal modification. An instrument maker from Vienna now offers successfully handmade plucked thermowood instruments. In wind instruments such as the bassoon or instruments such as the harmonica, not at last the lower water absorption is a major argument for the new material. Investigated with funds from a DFG project Dr. Pfriem therefore now more accurately invests the moisture transport in the wood. His next research object is the Queen of Instruments, the organ. Financing applications have been made, with three organ builders from Saxony first contacts. PS: Regarding smell: It´s said to have a smokey smell which ought to fade away though. Could be it makes appetite for smoked fish filets.
|
|
|
REPORT THIS POST AS INAPPROPRIATE |
Date Sep. 12 2018 3:07:55
|
|
printer2
Posts: 54
Joined: Sep. 19 2015
|
RE: Roasted spruce (in reply to Goldwinghai)
|
|
|
And here I saw the title of the thread and then how many pages have already been posted and thought to myself, I probably don't have much to add by now. And then I skipped through much of the conversation. Seems I didn't arrive late to the party. Torrified wood myself in normal air, just skirting the temperature where things get interesting. Have done spruce, pine (not recommended in air), birch, maple, oak, jatoba, cedar, cherry, I think I did a test piece of walnut but not a full sized piece. Read up about the process, digging for information for a month or two, it mainly comes down to removing some hemicellulose. Hemicellulose is what mainly absorbs or gives up water when the humidity changes. Titebond ans similar glues need more clamp time to get a good bond, when you put a bead of glue on the treated wood it balls up as the water portion of the wood does not wet the wood easily. There is a company that treats wood for major manufactures in North Dakota or Minnesota, can't remember which. They do it in an air environment. Think I showed a spruce guitar I built with the wood here a while ago. You can tell the difference between what the wood is like before and after being treated, less dampening. Not a 'Oh my god!' amount but noticeable. I do understand the sentiment that it can make a greater improvement in a less desirable piece than a great piece of wood. A great piece of wood has less distance to increase than a lessor wood.
|
|
|
REPORT THIS POST AS INAPPROPRIATE |
Date Sep. 14 2018 23:23:41
|
|
New Messages |
No New Messages |
Hot Topic w/ New Messages |
Hot Topic w/o New Messages |
Locked w/ New Messages |
Locked w/o New Messages |
|
Post New Thread
Reply to Message
Post New Poll
Submit Vote
Delete My Own Post
Delete My Own Thread
Rate Posts
|
|
|
Forum Software powered by ASP Playground Advanced Edition 2.0.5
Copyright © 2000 - 2003 ASPPlayground.NET |
0.078125 secs.
|