Q. We have an r.f. panel press. We have begun to notice a fair number of small open joints. The joints are opening only a small amount. It is like we do not have enough pressure, yet I see glue squeeze out and also see the pressure guage indicating good pressure. Where do we go next?
A. Let’s assume that you have freshly prepared, flat surfaces and that adequate adhesive is applied to the wood. The pressure is applied to the edge of the panel which squeezes out any excess adhesive, as is suppose to happen. However, then the pressure drops a slight amount. This slight drop in pressure is enough to open a few of the joints a little bit. As the excess adhesive has already been squeezed out, with this slight opening, there is no longer any adhesive to fill the gap. The result is an open joint. Check the hydraulic pressure to make sure that is does not drop even a little bit, once side pressure is applied.
A second option is that after you apply the side pressure, you then apply top pressure to flatten the panel and align any individual staves that are sticking up. As the panel flattens, I believe that you can imagine how a few of the joints would open just a small amount. Again, because the side pressure got rid of the excess glue, these small gaps will remain empty and create a poor joint. In this case, check the individual staves to make sure that the sides are perfectly square with the top; with cupped lumber, sometimes the cross section shape of a stave is trapezoidal instead of a perfect rectangle. Consider applying top pressure first.
Understand the differences in appearance, behavior and price
Q: We are having a problem with shrinkage. We make furniture, but someone else sells and delivers it. This person claims he did everything correctly, including opening the furniture wrapping (we wrapped the furniture with shrink-wrap and it was fairly well sealed) and letting it acclimate to the house climate. When the customer moved in, they said the furniture looked really wonderful, but within a week, it started to warp, open joints and crack in a few places. We are so careful to keep our plant at 40 percent RH and check the MC of the lumber. This is frustrating! Can you help?
Tips to avoid stress development and cracking
Why wood colors vary and what it means to you
Learn the desirable and not-so-desirable special
properties of some woods
A variety of wood glues are used to assemble the 175 pieces in a six-string guitar. Matching the proper adhesive with the application is important for Taylor Guitars.
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