FDMC Magazine

Finding the reason for glue line failure

Q. We have just had two panels of cedar with glue line failure. Normally, we have excellent results. We are using a two-part cross-linking PVA emulsion adhesive with a catalyst. We are checking the glue edges for squareness and flatness; we are positive that we have a good, even glue spread; we are keeping the open time to less than ten minutes; we are making sure we have a four-hour clamp time; and we do not machine for 24 hours. Our press has manual pressure. What should we be looking for?

FDMC Magazine

Kiln drying without cupping

Q. Is it possible to kiln dry freshly sawn, very wide (16 - 18 inch), 1-inch thick white pine lumber with minimal cupping? By minimal I mean, I want to be able to plane the wide boards down to 3/4 or 5/8 after it's dried to 6 percent.

FDMC Magazine

Heating with wet steam

Q. We use steam in several processes, including the kilns. The new boiler supervisor mentioned that we needed a desuperheater as the steam was too hot after the steam goes through a pressure reducer. What is a desuperheater and why is the steam too hot?