Claims
- 1. A process for accelerated fixing of heat-fixable wood preservatives in wood, comprising:
- contacting preservative-impregnated wood with an aqueous heated liquid heating medium preheated to at least 100 degrees F.;
- raising the temperature of the wood from ambient to from 100 F. to 240 degrees F.; and
- maintaining both liquid contact and raised temperature of the wood for a period of time from about 3 minutes up to about 10 minutes;
- whereby fixation in the outer layer occurs within 3 minutes, and complete fixation occurs in less than 48 hours.
- 2. A process according to claim 1 wherein complete fixation occurs in less than 24 hours.
- 3. A process according to claim 1 wherein said liquid heating medium is selected from the group consisting of water and aqueous solutions of boiling point elevators.
- 4. A process according to claim 3 wherein said boiling point elevator is a salt.
- 5. A process according to claim 3 wherein said boiling point elevator is ethylene glycol.
- 6. A process according to claim 1 wherein said contacting is accomplished by immersing said wood in said heated liquid heating medium.
- 7. A process according to claim 1 wherein said contacting is carried out by spraying said heated liquid heating medium onto said wood.
- 8. A process according to claim 1 wherein said contacting is carried out by causing said heated liquid heating medium to flow over and around said wood.
- 9. A process according to claim 1 wherein said preservative-impregnated wood is arranged in a bundle, and the contacting is accomplished by pumping said liquid heating medium through the bundle along the grain of said wood.
- 10. A process according to claim 6 further comprising agitating the heated liquid heating medium to accelerate contact between the liquid heating medium and the preservative-impregnated wood.
- 11. A process according to claim 1 wherein said fixable wood preservative contains chromium.
- 12. A process according to claim 1 wherein said fixable wood preservative contains ammonia or amine.
- 13. A process according to claim 11 wherein said wood preservative is CCA.
- 14. A process according to claim 11 wherein said wood preservative contains CCA and glow retardant.
- 15. A process according to claim 11 wherein said wood preservative contains CCA and fire retardant.
- 16. A process according to claim 1 wherein said liquid heating medium is heated to a temperature of from 140 degrees F. to 212 degrees F.
- 17. A process according to claim 1, further comprising adding to the liquid heating medium an additional treating agent from the group consisting of:
- a. fire retardants
- b. softening agents
- c. antichecking agents
- d. film formers
- e. coloring agents
- f. dimensional stabilizers
- g. fungicides,
- h. waterproofing agents, and
- i. antistatic agents.
- 18. A process according to claim 1 wherein the wood receives sufficient heat energy that complete fixation of the preservative in the outer layer is achieved during contact with the heated liquid heating medium.
- 19. A process for fixing fixable wood preservatives in preservative-impregnated wood, comprising:
- contacting said preservative-impregnated wood for from 3 minutes up to 10 minutes with hot water preheated to at least 100 degrees F.;
- accelerating the contact between the wood and the heated water until the wood receives sufficient heat energy that fixation of the preservative will be achieved in less than 48 hours; and
- removing the wood from contact with the water, and allowing fixation to continue for up to 48 hours.
- 20. A process according to claim 19 wherein the wood receives sufficient heat energy that complete fixation of the preservative will be achieved in less than 24 hours; and
- allowing fixation to continue for up to 24 hours.
- 21. A process according to claim 19 wherein the wood receives sufficient heat energy that complete fixation of the preservative in the outer layer is achieved during contact with the heated water.
- 22. A process according to claim 19 wherein the preservative-impregnated wood is heated by contact with water in an agitated solution.
- 23. A process according to claim 22 wherein the preservative-impregnated wood is in a bundle and agitation comprises pumping the heated water through the bundle of wood.
- 24. A process according to claim 19 wherein the preservative-impregnated wood is moved into and out of the heated water.
- 25. A process according to claim 19 wherein the wood preservative contains CCA and glow retardant.
- 26. A process according to claim 19, further comprising adding to the hot water at least one additional treating agent selected from the group consisting of: fire retardants, softening agents, antichecking agents, film formers, coloring agents, dimensional stabilizers, fungicides, waterproofing agents, and anti-static agents; whereby such treating agents impart their desirable properties to said preservative-impregnated wood.
- 27. A process for eliminating photochromic color variation in wood impregnated with heat-fixable wood preservatives, comprising:
- contacting preservative-impregnated wood with an aqueous liquid heating medium;
- raising the temperature of the wood from ambient to from 100 F. to 240 degrees F.; and
- maintaining both liquid contact and raised temperature of the wood for a period of time from 3 to 10 minutes;
- whereby complete fixation occurs in less than 48 hours.
- 28. A process according to claim 27 wherein said liquid heating medium is selected from the group consisting of water and aqueous solutions of boiling point elevators.
- 29. A process according to claim 28 wherein said boiling point elevator is a salt.
- 30. A process according to claim 28 wherein said boiling point elevator is ethylene glycol.
- 31. A process for accelerated fixing of heat-fixable wood preservatives in wood, comprising:
- contacting preservative-impregnated wood with an aqueous liquid heating medium;
- heating said liquid heating medium to a temperature of at least 100 degrees F after said wood is contacted by said liquid heating medium;
- raising the temperature of the wood to from 100 F. to 240 degrees F.; and
- maintaining both liquid contact and raised temperature of the wood for a period of time from 3 to 5 minutes;
- whereby complete fixation of preservatives occurs in less than 48 hours.
- 32. A process for producing a low-weight heat-fixed preservative-containing wood, comprising:
- contacting preservative-impregnated wood with an aqueous liquid heating medium preheated to at least 100 degrees F.;
- raising the temperature of the wood from ambient to from 100 F. to 240 degrees F.;
- maintaining both liquid contact and raised temperature of the wood for a period of time from 3 minutes up to 2 hours, thereby fixing the preservative in the outer layer;
- terminating liquid contact with the wood; and
- driving off a portion of the water contained in the wood, and reducing the weight of the treated wood, whereby a low-weight, heat-fixed, preservative-impregnated wood product is produced.
- 33. A process for producing a low-weight heat-fixed preservative-containing wood according to claim 32, wherein a portion of the water contained in the wood is driven off by evaporation promoted by the residual heat in the wood.
CROSS REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part application of copending application Ser. No. 07/350,604, filed May 11, 1989.
US Referenced Citations (4)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
350604 |
May 1989 |
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