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US 12,220,836 B2Granted
Modified wood product and a process for producing said product
AssigneeStora Enso OYJ
InventorsDuncan Mayes, Janne Pynnönen, Reeta-Maria Stöd
Life of this patent
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Abstract
The present invention relates to a process for preparing a modified wood product wherein a step of resin treatment is followed by a thermal modification step. The present invention also relates to a modified wood product produced using said process.
Claims18
A process for preparing modified wood comprising the steps of
- a. resin treatment of never dried solid wood having a moisture content of at least 10%, wherein the resin solution comprises at least one of the group consisting of phenol formaldehyde, phenol urea formaldehyde, a melamine resin, lignin, tannin or a mixture thereof, wherein a quantity of the resin applied is 10-400 g/m2, followed by
- b. a thermal modification step wherein the wood is heated at a temperature of from 160° C. to 230° C. at atmospheric pressure for a time of 1 to 5 hours in an essentially oxygen-free environment wherein curing and crosslinking of the resin takes place.
A process for preparing modified wood comprising the steps of
- a. resin treatment of never dried solid wood having a moisture content of at least 10%, wherein the resin solution comprises at least one of the group consisting of phenol formaldehyde, phenol urea formaldehyde, a melamine resin, lignin, tannin or a mixture thereof, wherein a quantity of the resin applied is 10-400 g/m2, and wherein the resin treatment takes place at a temperature of 20° C. to 50° C. and a pressure above 1 bar, followed by
- b. a thermal modification step wherein the wood is heated at a temperature of from 160° C. to 230° C. at atmospheric pressure for a time of 1 to 5 hours in an essentially oxygen-free environment wherein curing and crosslinking of the resin takes place.
Dependencies are inferred from the claim text.