Use of no-added-formaldehyde (NAUF) particleboard and MDF wood products can sometimes cause discoloring of exotic veneers, according to www.buildinggreen.com. The site has received reports from design teams that have encountered performance issues resulting in delamination and discoloration of veneers applied to Class A fire-resistant NAUF substrate materials.
Producers of the substrate material have reported that many factors can contribute to these issues, including materials and veneer glues used, environmental conditions, surface coatings, temperatures and pressing times. Another panel producer identified exotic veneers such as makore, wenge and English sycamore cut thinner as being affected by these problems. All substrates were identified as being fire resistant panels. One possible remedy is to use a backer or barrier to prevent borate or silica from the fireproofing materials from reaching the veneer.
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Q: We are having some problems with veneer adhesion to
our MDF substrate. After we have completed the panel and finished
it, we notice delamination (a raised bump) in a few areas in the
center. What should we be looking for?
Q: I'm using some 2-inch-thick lumber to make kitchen
work tops. This wood has some defects, like knots. I cannot
figure out how to use my hand router to cut out these defects in
a curved cut and then end up with two tight fitting pieces. Any
pointers to find which way to do this would be much
Q: I have read every Wood Doctor column you have written and have gained a lot of practical information. But here is a question I have not seen addressed before. As background, our fairly large company has really gone into JIT, just-in-time, manufacturing, which means in-process materials cannot sit around very long at all. Well, this has recently translated into machining our glued up panels (edge-glued on a clamp carrier) within 24 hours after they are glued, or sometimes less. Of course, you know what the problem is: sunken glue joints that are obvious after finishing. My suggestion of waiting three days after gluing, as we have always done, has not been well-received. I am hoping that you have some help for us.
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Q: We are having a problem with raised glue joints in
our solid wood (mahogany) panels and we would like to know what
your recommendation is for the amount of moisture content that we
could get by with, without causing this problem? This applies
also to high-frequency gluing.
The properties of medium-density fiberboard make it a valuable resource for many applications
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I think most people would do the same when they are headed with the situation.http://www.sense2.com.au/
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