Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
  • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
  • B27K3/002—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process employing compositions comprising microorganisms
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
  • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
  • B27K3/02—Processes; Apparatus
  • B27K3/0235—Stationary devices on or in legs or poles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
  • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
  • B27K3/02—Processes; Apparatus
  • B27K3/14—Bandage methods
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
  • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
  • B27K3/34—Organic impregnating agents

Definitions

• the present invention relates to novel, degradation resistance, wood structures and a method for treating wood structures to minimize their degradation.
• Wood is one of the most utilized mate ⁇ als of human society. However, like any mate ⁇ al, wood is susceptible to degradation This degradation, wood decay, is believed to result p ⁇ ma ⁇ ly by physical weathe ⁇ ng and the biological acUon of bacte ⁇ a, fungi and insects.
• the present invention provides a method to extend the functional life of wood structures by alte ⁇ ng the environment of wood decay organisms while minimizing the use of environmentally hazardous chemicals.
• the method of the present invention advantageously provides an economical means for extending the life of wood structures placed into service, and/or currently in service, while significantly minimizing the environmental ⁇ sks and workplace ⁇ sks posed by the current treatment technology, both in initial treatment and reapplication.
• degradation of wood structures is retarded through the use of a physical bamer and a microbial treating solution, to affect the nature of the microbes in, on and surrounding the wood structure.
• a microbial treating solution affects the environment of the microorganisms responsible for wood decay to minimize decay
• the method of the present invention is particularly advantageous for treating wood supporting structures including, but not limited to- telephone poles, utility poles, pilings, foundations and other building supports and the like.
• the method may be utilized to further treat wood structures, such as telephone poles, utility poles and the like, which have already been treated with creosote, pentachlorophenol and/or CCA.
• the present invention also provides new wood structures, including the wood supporting structures listed above, with increased resistance to degradation.
• An advantage of the method of the present invention is that the method minimizes the use of environmentally hazardous chemicals, and the need to retreat wood structures with environmentally hazardous chemicals
• Another advantage of the method of the present invention is that the method is simple and economical
• a further advantage of the method of the present invention is that the method may be performed at a worksite, prior to placement of the w ood structure
• Figure 1 depicts a wood structure (utility pole) of the present invention having been treated according to the method of the present invention
• a method for treating wood structures comp ⁇ ses- applying a microbial treating solution to a portion of the wood structure subject to decay from microbial organisms, and cove ⁇ ng a portion of the wood structure subject to decay from insects with a substantially insect impenetrable mate ⁇ al , wherein the covered portion comp ⁇ ses at least a portion of the treated portion
• the method for treating wood structures of the present invention further comp ⁇ ses applying additional microbial treating solution to the treated and/or covered portion of the wood structure, and/or the ground surrounding the wood structure, at time intervals sufficient to maintain an altered microbial community in the wood structure.
• the portion of the wood structure, and/or the wood structure, treated according to the method of the present invention may comp ⁇ se virgin (untreated) wood, or may comp ⁇ se wood treated with creosote or another chemical treatment.
• the method of the present invention is particularly advantageous in treating utility poles which have already been treated with creosote, pentachlorophenol and/or CCA.
• the portion of the wood structure subject to decay from microbial organisms includes a portion of the wood structure located where oxygen in present underground to approximately 2 feet above the ground.
• the portion of the wood structure subject to decay from insect includes a portion of the wood structure located where oxygen in present underground to approximately 2 feet above the ground.
• the portion of the wood structure treated by the method of the present invention will be a portion extending from approximately 4 feet underground to 2 feet above the ground, preferably from 3 feet underground to 1 foot above the ground, similar portions of the wood structure will generally be covered by the substantially insect impenetrable mate ⁇ al according to the method of the present invention.
• Suitable substantially insect impenetrable mate ⁇ als include plastics, including polyethylene, polypropylene and the like. As understood to those of ordinary skill in the art insects may eventually penetrate any mate ⁇ al, particularly where the mate ⁇ al is located in an outdoor environment and therefore susceptible to puncture and or other damage. Thus, the present invention should not be construed to require that the substantially insect impenetrable matenal remain impenetrable over its entire life, however preferably it will.
• a preferred substantially insect impenetrable mate ⁇ al is a sheet of plastic matenal is utilized and wrapped around the wood structure and sealed/sh ⁇ nk fitted by the application of heat.
• the substantially insect impenetrable mate ⁇ al will assist in maintaining an altered environment for microbes within, on the surface of, adjacent to the surface of, and in the ground surrounding the wood structure.
• a further benefit is that the substantially insect impenetrable matenal will help to prevent seepage of any environmentally hazardous chemicals, the wood structure may have been treated with, into the environment.
• the combination of the microbial treating solution, and the substantially insect impenetrable mate ⁇ al will generally alter the environment for insects and microbes, withm, on the surface of, adjacent to the surface of, and in the ground surrounding the wood structure.
• This environment will be further altered by, and constantly changing due to, the effects of precipitation, humidity, temperature and the like, from the outside environment, on the wood structure.
• the altered environment for insects and microbes will vary from an aerobic environment to an anaerobic environment, a wet to dry environment, a nut ⁇ ent ⁇ ch to a nut ⁇ ent poor environment, etc. While not wishing to be bound by any theory, it is believed that the alte ⁇ ng environmental conditions result in an altered microbial community (a microbial community with an altered metabolism) which will not be as active in degrading the wood structure.
• additional microbial treating solution may be applied to the wood structure and/or the ground surrounding the wood structure. Additional microbial treating solution may be applied to the wood structure by injecting the solution into or adjacent to the wood surface, preferably at least in part underneath the substantially insect impenetrable sheet. Preferably, additional microbial treating solution is applied through the use of a controlled release reservoir positioned above the substantially insect impenetrable on the wood structure.
• the reservoir may be filled with microbial treating solution which upon release will travel down the wood structure, due to gravity, and seep into the wood surface and into the area adjacent to the wood surface, underneath and on top of the substantially insect impenetrable mate ⁇ al, and into the ground surrounding the wood surface.
• the reservoir may be constructed from a plastic, including but not limited to, polyethylene or polypropylene, and includes means for sto ⁇ ng microbial treating solution and means for releasing the microbial treating solution at controlled intervals.
• the means for sto ⁇ ng microbial treating solution include, but are not limited to, a reservoir, and/or vascular space in the intenor portion of the reservoir
• the means for releasing the microbial treating solution include small perforations or holes in the reservoir which will open under certain temperature or humidity conditions to release microbial treating solution from the storage space
• Suitable microbial treating solutions include those which will alter the environment for microbes in, on and surrounding the wood structure, and/or alter the metabolism, and/or otherwise render ineffective, microbes and bacte ⁇ a which degrade wood in nature.
• Wood comp ⁇ ses interlocked layers of cellulose and lignin The decomposition of lignin in nature is generally understood to occur almost exclusively through the agency of fungi called Basidtomycetes and bactena. As each layer of lignin is compromised, more of the readily degraded cellulose becomes available. It is believed the action of these fungi in concert with bactena, which rapidly degrade cellulose, which allows for the degradation of wood in nature. Insects, such as termites can do considerable damage, but even they rely on bacte ⁇ a to ultimately degrade the cellulose.
• the preferred microbial treating solution comp ⁇ ses one or more of the following: a readily available carbon source solution, a lysis agent/surfactant solution, a osmotic pressure alternateng solution or mixtures thereof. These solutions may be used separately, or in concert, to control the activity of wood decay organisms immediately adjacent to the wood structure. As set forth above, regardless of which treatments are utilized the wood structure will also be wrapped in a sheet of substantially insect impenetrable matenal such as polyethylene. A reservoir with additional treatment solutions may also be utilized.
• the substantially insect impenetrable matenal will also help to isolate the microbial community immediately adjacent to the pole so that community can be more readily manipulated by the microbial treating solut ⁇ on(s).
• the reservoir will be designed to release treatment solution gradually over time and will thereby help to reduce the need for subsequent re-treatment of the poles, preferably to the point that re-filling ofthe reservoir will only be required approximately every three years.
• One suitable microbial treating solution comp ⁇ ses a readily available carbon source.
• bactena and fungi are in competition for available resources in the area adjacent to the surface of the wood. Competition for available resources is a fundamental tenet of biology and is visible on all levels of life. To utilize this competition to control the activity of wood decay organisms, a readily available carbon source is applied to the wood structure.
• Readily available carbon sources include solutions compnsing 10 to 80%, by weight, preferably 40 to 60%, by weight, a carbon source, including, but not limited to, molasses, corn syrup, fruit sugars, food processing wastes, other sugar solutions and/or mixtures thereof, in water Molasses is a preferred carbon source because molasses also includes sulfur which as explained below provides additional advantages.
• the competition for a readily available carbon source should tend to favor the bacte ⁇ a in the system over the fungi because the bactena are more readily adaptable and will consume the carbon source at a rate approaching the maximum possible rate.
• the limiting factor in the degradation of molasses will, in fact, be another limited resource for which bacte ⁇ a compete with fungi, namely oxygen.
• anaerobic defined as extremely depleted oxygen
• Anaerobic organisms make their energy through the reduction of available compounds and in the absence of oxygen and nitrate the reduction of sulfur compounds is favored. These processes produce far less energy than aerobic processes and as such are much slower. Further, there are no known pathways for the anaerobic biodegradation of lignin Thus, the anaerobic community should be either greatly slowed or completely prevented from the degradation of the wood present.
• H 2 S hydrogen sulfide
• Another suitable microbial treating solution which may be utilized in conjunction with other microbial treating solutions comp ⁇ ses a lysis agent and a surfactant, or a lysis agent surfactant.
• a preferred lysis agent/surfactant is sodium dodecyl sulfate (SDS), preferably in a 1 to 20%, by weight, solution in water
• SDS sodium dodecyl sulfate
• SDS is capable of lysing the cell membranes of many bactenal species thereby causing their death.
• SDS is a surfactant and thus structurally has both lipophilic and hydrophilic moieties
• SDS can increase the effective solubility of any creosote or pentachlorophenol present in the wood structure. This increase in the effective solubility theoretically increases the microbial reducing activity of the creosote or pentachlorophenol, without adding new amounts of these compounds to the system
• Suitable microbial treating solution is one which will alter the osmotic pressure conditions at the wood surface, and/or immediately adjacent to the wood surface
• Suitable osmotic pressure alternateng solutions include, but are not limited to concentrated salt solutions, sugar solutions, other ion ⁇ ch solutions and the like.
• a relatively concentrated salt (NaCl) solution to the wood surface alter the osmotic conditions immediately adjacent to the pole.
• NaCl relatively concentrated salt
• the salty conditions should therefore favor bacte ⁇ a which are not inhibited by the salt to the exclusion of fungi both initially, and subsequently, because while there are known to be halophilic (salt-loving) species of bactena, there are no currently known species of halophilic fungi.
• High concentrations of salt also can be toxic to and therefore deter insects, should they be able to penetrate the substantially insect impenetrable bamer Salt should also accumulate adjacent to the pole over time if it is prevented from contact with rainwater (e.g. through the use of a plastic substantially insect impenetrable matenal) which will maximize its effectiveness as the greater the concentration of salt the better its effect.
• a novel wood structure of the present invention comp ⁇ ses a wood structure which has been treated according to the method of the present invention. More particularly according to the present invention, a wood structure comp ⁇ ses- a wooden member; a microbial treating solution in contact with a portion of the surface of the wooden member; and a substantially insect impenetrable mate ⁇ al in contact with the microbial treating solution and thereby in contact with the portion of the surface of the wooden member.
• the wood structure further comp ⁇ ses: a reservoir, with additional microbial treating solution contained within, positioned adjacent to the portion of the surface contacted with the microbial treating solution and including means for dispensing the additional microbial treating solution onto the portion of the surface, and into the area between the portion of the surface and the substantially insect unpenetrable mate ⁇ al.
• wood structures of the present invention include, but are not limited to, wood supporting structures such as telephone poles, utility poles, pilings, foundations and other building supports and the like.
• the wood structure of the present invention may comp ⁇ se "virgin” (untreated) wood or wood that has been treated with creosote, pentachlorophenol, CCA, and/or other treating agents.
• Suitable microbial treating solutions, substantially insect impenetrable mate ⁇ als and reservoirs for use in the wood structure of the present invention, and details relating to the assembly and use of the wood structure of the present invention are set forth above with respect to the method of the present invention, and in the following paragraphs.
• Figure 1 depicts a utility pole treated according to the method of the present invention, and which is a wood structure of the present invention.
• a utility pole 2 includes a substantially insect impenetrable matenal 4 sunounding a portion 3, of the surface of the utility pole near ground level and a reservoir 6, surrounding pole 2, and located at, or adjacent to surface portion 3.
• H a is the height (depth) of mate ⁇ al 4 above ground level and H u is the height (depth) of material 4 beneath ground level.
• H u is preferably equal to the soil depth where oxygen is present.
• H u will be 0.5 foot to 4 feet, preferably 1 to 3 feet, more preferably approximately 3 feet.
• H a is preferably equal to the distance above ground (height) where microbial and insect populations are substantial.
• H a will be 0.25 foot to 2 feet, preferably 0.5 foot to 1.5 feet, more preferably approximately 1 foot.
• H r is the height of reservoir 6 above matenal 4.
• H r is preferably a distance which will permit microbial solution to contact the portion 3 of the surface of the utility pole near ground level, and to travel into the space adjacent to the wood surface at portion 3 and underneath mate ⁇ al 4. Generally, H r will be 0.0 inches to
• Treated utility pole 2 may be assembled p ⁇ or to placement in the ground or after placement in the ground p ⁇ or to back-filling the hole.
• a microbial treating solution is applied to surface portion 3 of utility pole 2.
• the substantially insect impenetrable mate ⁇ al 4 is wrapped around pole 2, over at least a portion of the microbial treating solution.
• Reservoir 6, is then affixed to pole 2 utilizing adhesives, and/or fasteners such as nails, screws, or the like
• Reservoir 6 may be filled with microbial treating solution p ⁇ or to affixing the reservoir to the pole, or after affixing the reservoir to the pole Utility pole 2, may then be placed upnght in a hole in the ground and utilized
• the portion 3, of the pole's surface to be treated may be determined by knowing the depth of the hole in which the pole will be placed and which end of the pole will be placed into the ground. The portion 3 may then be easily determined by determining the portion of the pole which will end up at ground level. Additionally, the portion of the pole treated with the microbial treating solution and the portion of the pole covered with the substantially insect impenetrable bamer may be the same or different but will generally overlap at least in part.

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• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Wood Science & Technology (AREA)
• Forests & Forestry (AREA)
• Microbiology (AREA)
• Chemical And Physical Treatments For Wood And The Like (AREA)

Applications Claiming Priority (5)

Publications (2)

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Family Applications (1)

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Citations (3)

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• 1996
  • 1996-09-26 WO PCT/US1996/015401 patent/WO1997011788A1/en not_active Application Discontinuation
  • 1996-09-26 BR BR9610635-2A patent/BR9610635A/pt not_active Application Discontinuation
  • 1996-09-26 EP EP96933138A patent/EP0853506A4/de not_active Withdrawn

Patent Citations (3)

Non-Patent Citations (1)

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