Eko zaštita drva

[TB]

evo što komentiraju ljudi:

Brandon Fesse
Charring the wood (cellulose + lignin + water + other junk) creates new chemicals that act as preservatives-- polycyclic aromatic hydrocarbons (PAHs) and creosotes. It's not really "without chemicals"; but the preservative chemical compounds are generated in situ.

SuperBardley
Apparently it's insect resistant as well. Certain heating techniques also strengthen/harden wood to the same end -- "carbonized" bamboo is an example. Woods naturally contain starches that are a food source for insects, I believe the heating converts those starches to sugars which become no longer a viable food source for the insects, and the conversion is a form of "carmelization" as well, so the wood is darkened.

Doug Robertson
The main idea is that when you heat the wood many chemical processes take place. Some of the most significant are carbonization (burning) of the wood, development of formaldehyde and the conversion of cellulose into crystalline cellulose. In addition many of the more volatile compounds in the wood are burned out. Formaldehyde is an excellent preservative. It is tightly bound in the wood and shouldn't have any notable negative effects except the preservation of the wood. The carbonized layer of the wood is a barrier to molds and helps prevent rot from setting in as well an improved water barrier (not perfect, but much better than raw wood.) Many of the volatile chemicals that are either converted to different forms from the heat or just driven off in the process are the ones that react most significantly with water. Mostly these are the lignuns. They are the chemicals that cause the swelling and cracking over time as the moisture levels change in the wood. By removing or changing them you actually stabilize the wood and dramatically reduce the size changes from moisture. In fact the process dramatically reduces the equilibrium moisture level of the wood (a good thing.) One of the most significant changes is that the cellulose in the wood converts into a crystalline cellulose from its regular form. Crystalline cellulose does not absorb water and isn't a food source for most of the molds and insect pests that would normally bother you. This form of cellulose is very stable and gives your wood amazing longevity. I am really fascinated by the Japanese process and plan on trying it out in some future projects. Good luck with your work and please keep sharing these. BTW, here is a good (but very technical) reference on what is happening (PDF Alert); https://www.ncsu.edu/bioresources/BioRes_04/BioRes_04_1_0370_Esteves_P_Wood_Mod_Heat_Treatment_Rev_367.pdf

[fazy]

...na koji način paljenje štiti drvo - zašto sporije trune ako je zagoreno?

Uspoređujem to sa dimljenjem mesa.
Dim zaštičuje kobasice i meso od kvarenja.
Nadalje ako se meso dimi na tavanu, krovište (letve, grede i rogovi), taju dulje nego nedimljeni dio istog krovišta.

[ppsupercop]

Provereno u našim krajevima...Dok su planinske kuće bile pokrivane šindrom,i pritom,bile bez izvedenih dimnjaka,dim se ravnomerno širio po krovnoj površini ispod otvora na krovu kroz koji je izlazio napolje.
Čitav krov iznutra je bio poptuno natopljen garom.Kad su u zadnjoj polovini prošlog veka počeli da zidaju dimnjake,krovovi su počeli da propadaju veoma brzo,verovatno zvog kondenzacije...

[m2]

Provereno u našim krajevima...Dok su planinske kuće bile pokrivane šindrom,i pritom,bile bez izvedenih dimnjaka,dim se ravnomerno širio po krovnoj površini ispod otvora na krovu kroz koji je izlazio napolje.
Čitav krov iznutra je bio poptuno natopljen garom.Kad su u zadnjoj polovin prošlog veka počeli da sidaju dimnjake,krovovi su počeli da propadaju veoma brzo,verovatno zvog kondenzacije...

..drvni ocat, "katran", .... u dimu konzerviraju grede...

[TB]

evo testa na običnoj građevinskoj dasci:

---lijeva strana je prethono obrušena, desna nije.

1. paljenje
2. paljenje
3. brušenje

zaključak: bolje je prvo brusiti, a nakon toga paliti 

[Nikola]

Zanimljivo, hvala na ovom pokusu i informacijama!

[fazy]

Koliko tek plina troše ova dvojica!?
Ali, ide im posao!
I ovo sa gašenjem plamena četkom, je dobra ideja:

[TB]

čak se i ne troši puno, ja sam se iznenadio da ona kartuša za 10kn gori preko pola sata, jedino što je slaba...

ako ovako pališ do potpunog crnila nije ti potrebno brušenje pa i uštediš na struji 

četka je dobra, možda bi išlo i bez ispiranja vodom...

[TB]

dreveni oluk - brušenje, paljenje i lan ulje.

možda bacim još jedno paljenje do crne boje.

imate ili ideju za zapunjavanje otvora između dasaka?

[andjelkoasa]

Starinski sistem: kudelja i smola od crnogorice.

[TB]

dobra ideja, samo treba dosta materijala nabaviti!

[m2]

dreveni oluk - brušenje, paljenje i lan ulje.

možda bacim još jedno paljenje do crne boje.

imate ili ideju za zapunjavanje otvora između dasaka?

Koristiti bambus većeg promjra za oluk, samo ukloniti "pregrade", "spaliti" iznutra....?

[TB]

to je Nikolina ideja, samo nisam našao bambus fi100, 6m u okolici, kao ni pilara koji radi oluke od trupaca tako da je izbor pao na daske.

[Nikola]

Kolofonij je proizvod koji se može kupiti, a radi se od prirodne smole.

[Shorty]

Kao što naslov govori, za eko zaštitu drva dobre su i boje na bazi vode. Ne smrde, nisu otrovne ni zapaljive..