GB2261682A - Wood-preservative belt and method for preserving wood - Google Patents
Wood-preservative belt and method for preserving wood Download PDFInfo
- Publication number
- GB2261682A GB2261682A GB9224088A GB9224088A GB2261682A GB 2261682 A GB2261682 A GB 2261682A GB 9224088 A GB9224088 A GB 9224088A GB 9224088 A GB9224088 A GB 9224088A GB 2261682 A GB2261682 A GB 2261682A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wood
- preservative
- belt
- flexible sheet
- pole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003171 wood protecting agent Substances 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims description 7
- 239000002023 wood Substances 0.000 title description 8
- 239000000463 material Substances 0.000 claims abstract description 54
- 238000011282 treatment Methods 0.000 claims abstract description 7
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- 239000003755 preservative agent Substances 0.000 description 10
- 230000002335 preservative effect Effects 0.000 description 9
- 238000009434 installation Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- -1 polyethylene Polymers 0.000 description 4
- 238000011866 long-term treatment Methods 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 229920000027 Valéron Polymers 0.000 description 2
- 231100001261 hazardous Toxicity 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- HDVXJTYHXDVWQO-UHFFFAOYSA-N valeranone Natural products C1CCC(=O)C2(C)CC(C(C)C)CCC21C HDVXJTYHXDVWQO-UHFFFAOYSA-N 0.000 description 2
- JLHMJWHSBYZWJJ-UHFFFAOYSA-N 1,2-thiazole 1-oxide Chemical class O=S1C=CC=N1 JLHMJWHSBYZWJJ-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 150000001642 boronic acid derivatives Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 235000010746 mayonnaise Nutrition 0.000 description 1
- 239000008268 mayonnaise Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002195 soluble material Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000013008 thixotropic agent Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- 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
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2305/00—Condition, form or state of the layers or laminate
- B32B2305/02—Cellular or porous
- B32B2305/026—Porous
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
A wood-preservative belt 1 comprising a first flexible sheet 2, a wood-preservative material 3 and a second flexible sheet 4, made of a microporous or microperforated material, is useful in the ground line treatment of a wooden pole 5 comprising the following steps: (1) attaching the wood-preservative belt to the pole with the second flexible sheet in contact with the pole; and (2) applying a sufficient pressure to the first flexible sheet so as to cause the wood-preservative material to pass through the second flexible sheet and thereby contact and treat the wooden pole. <IMAGE>
Description
Wood-preservative belt and a method for preserving wood
This invention is concerned with a woodpreservation belt and a method for preserving wood.
More particularly, though not exclusively, the present invention concerns a wood-preservative belt useful for ground-line treatment of wooden telegraph poles which may be installed without the installer coming into contact with the wood-preservative material.
US-A-4779735 discloses a wood-preservative package or bandage comprising a first flexible sheet, a woodpreservation material having a grease-like consistency layered upon the first flexible sheet and perforated flexible sheet overlaying the preservative material and secured to the marginal edge of the first flexible sheet. In use, the package is wrapped around the wooden pole to be preserved with the perforated sheet in contact with the wood to be treated. During intallation the package must be either wrapped progressively and very tightly around the pole or squeezed prior to wrapping to extrude the grease-like preservative material onto the outermost surface of the perforated sheet, thereby enabling the preservative material to come in contact with and treat the wood.Whilst this package protects the installer from coming into contact with the grease-like preservative material during preparation for installation, the installer has to proceed with caution since the preservative material becomes exposed on the perforated sheet before installation is completed, during the wrapping procedure. Furthermore, the package is not suitable for long-term treatment of poles since, after installation, the grease-like preservative material not extruded during wrapping tends to be retained in the package, between the first flexible sheet and the perforated sheet, rather than further contacting or treating the wood.In a preferred embodiment of US-A-4779735, it is disclosed that this problem may be overcome by making the perforated sheet out of a water-soluble material which after sufficient rainfall dissolves to further contact and treat the wood. This is not a satisfactory solution to providing packages for long-term treatment of poles since rain tends not to fall uniformly onto the package, so that only portions of the perforated sheet became dissolved, and the grease-like preservative material has to be selected to contain no water which may dissolve the perforated sheet, otherwise the shelflife of the package will be dramatically reduced.
It is an object of the present invention to provide a wood-preservative belt which during normal installation does not expose the installer to preservative material. It is a further object of the present invention to provide a wood preservative belt which is capable of providing long-term treatment of poles.
In accordance with the present invention there is provided a wood-preservative belt comprising a first flexible sheet, a wood-preservative material and a second flexible sheet secured to the marginal edge of the first flexible sheet, and is characterised in that the second flexible sheet is made of a microporous or microperforated material.
In accordance with another aspect of the present invention, there is provided a method for the ground line treatment of a wooden pole comprising the following steps: (1) attaching a wood-preservative belt, comprising a first flexible sheet, a wood-preservative material and a second flexible sheet formed of microporous or microperforated material and secured to the marginal edge of the first flexible sheet, to the pole with the second flexible sheet in contact with the pole; and (2) applying a sufficient pressure to the first flexible sheet so as to cause the woodpreservative material to pass through the second flexible sheet and thereby contact and treat the wooden pole.
The wood-preservative belt of the present invention has the advantage that, under normal installation procedures, substantially no wood-preservative material passes through the second flexible sheet until pressure is applied to the first flexible sheet. Accordingly, under normal installation conditions, the installer cannot become exposed to the hazardous wood-preservative material. (It will be appreciated that abnormally heavy handling of the wood-preservative belt may cause a small portion of the wood-preservative material to pass through the second flexible sheet.However, it is unlikely that the amount of wood-preservative material which may pass through the second flexible sheet under such conditions will be sufficient to provide adequate treatment of the pole and, furthermore, the amount is unlikely to be sufficient to be considered particularly hazardous to the installer.)
The wood-preservative material preferably is not of a grease-like consistency. Such materials are generally considered not suitable since too high a pressure is required to cause the material to pass through the second flexible sheet.
Preferably, the wood-preservative material has a viscosity of from above about 1 poise to no more than about 20 poise, more preferably from 2 poise to no more than 12 poise at 200C. Typically, the wood preservative materials useful in the present invention have a viscosity similar to that of a lightly bodied materialsuch as a paint or a light lubricating oil, but are no more viscous than mayonnaise. The woodpreservative material may comprise a thixotropic agent, in which case the material preferably requires a pressure of no more than about 15 Pa, preferably from about 10 to about 15 Pa, to cause the material to shear.
The active wood-preservative in the woodpreservative material may be any wood-preservative that is commonly used for ground-line treatment of telegraph poles and is capable of being formed in an appropriate solution, dispersion or suspension. Typically, such suitable wood-preservatives include copper or zinc naphthanates, isothiazolones, and/or inorganic borates.
The active wood-preservative may be dissolved, suspended or dispersed in any appropriate diluent or carrier, which is most preferably water.
The first flexible sheet must be insoluble in the wood-preservative material and is preferably a waterinsoluble polymeric sheet formed from, for example, polyethylene, polypropylene, or pvc. Polymers which are soluble in the wood-preservative material over a long period of time may be used, but use of such polymers tends to be detrimental to the longevity of the belt (shelf-life) and its performance (once fitted to the pole).
The second flexible sheet, which is formed of a microporous or microperforated material, is preferably a water-insoluble polymeric sheet formed from, for example, polyethylene, polypropylene or pvc.
By a "microporous" and "microperforated" material.
it is meant that a liquid, having a viscosity of about 2 poise at 200C, will not pass through a sheet of the material when under atmospheric pressure but will pass through the sheet when under pressures greater than atmospheric pressure. Typically, a microporous or microperforated material will have a pressure resistance of at least about 105mm of water.
Preferably, the second flexible sheet is formed of a microperforated material such as Valeron film, available from Van Leer (UK) Limited. Such microperforated materials allow water vapour to pass through but water per se is not permitted to pass through without the application of pressure. Suitable perforated materials may be prepared in accordance with
GB-A-1577128 and GB-A-1580697.
The pressure which is sufficient to cause the woodpreservative material to pass through the second flexible sheet may be applied to the first flexible sheet by way of a belt which is tightened around the pole and belt. Most preferably, however, it has been found that the pressure applied to the belt merely from filling and settling the earth used around the pole and belt is quite sufficient to cause the wood-preservative material to pass through the second flexible sheet and thereby treat the pole. Over a period of time it may be found that a substantial proportion of the woodpreservative material passes through the second flexible sheet to treat the pole, whereas in the prior art package a substantial proportion of the grease-like preservative was retained in the package.
The wood-preservative belt is preferably used by attaching the belt around a wooden pole at ground level in a conventional manner e.g. with tacks along the marginal edges. In another embodiment, the inner and/or outer marginal edges of the belt may be fitted with means for attaching the belt to the pole eg such means may an adhesive.
In a preferred embodiment, the belt of the present invention has a third flexible sheet overlying the second flexible sheet. The third flexible sheet, which is removed before attaching the belt to the pole, is to prevent wood-preservative material passing through the second flexible sheet which may otherwise occur during heavy handling or transportation of the belt.
In another preferred embodiment, the second flexible sheet is secured, in addition to at the marginal edges, to the first flexible sheet at a plurality of positions so as to form sachets for the wood preservative material. The provision of sacheted wood-preservative material tends to improve the handleability and packaging of the belt.
In yet another preferred embodiment, a number of belts are connected to form a strip of belts which may be rolled or folded for ease of packaging. Each belt may be detached from the adjacent belt for use by tearing a perforated portion in the connected marginal edge.
The invention will now be further described with reference to the following drawings in which Fig 1 is a view of a wooden pole fitted with a belt of the present invention; and Fig 2 is a view of a preferred embodiment of the present invention.
A wood-preservative belt 1 comprises a first flexible sheet 2, formed of polyvinyl chloride, a wood preservative material 3, comprising an aqueous solution of [a named wood preservative] having a viscosity at 200C of 2 poise, and a second flexible sheet 4, formed from a microperforated, water-insoluble polymeric sheet sold under the trade name Valeron (Van Leer). The belt 1 is attached to a wooden pole 5, at the ground line, by an adhesive strip 6 on the upper and lower marginal edges of the belt 1. Earth 7 used to hold the pole 5 in position exerts a pressure on the first flexible sheet 2 so as to cause wood preservative 3 to pass through the second flexible sheet 4 and contact and treat the wood.
In addition to attaching the belt 1 to the pole 5, the adhesive strip 6 prevents wood-preservative material 3 escaping from the treatment area of the belt.
Fig 2 illustrates another embodiment of the present invention in which a plurality belts 1 comprise a first flexible sheet 2 secured at a plurality of positions to the second flexible sheet 4 so as to form sachets 8 of the wood-preservative material. A third flexible sheet 9 covers the second flexible sheet 4 and is readily removeable therefrom for use. The end edges 10 of each belt 1 are perforated 11 to assist separation of one belt from another. In this particular embodiment, the belts 1 are illustrated to be folded in a box 12 for ease of transportation and handling.
Claims (10)
1. A wood-preservative belt comprising a first flexible sheet, a wood-preservative material and a second flexible sheet secured to the marginal edge of the first flexible sheet characterised in that the second flexible sheet is made of a microporous or microperforated material.
2. A wood-preservative belt as claimed in claim 1, wherein the second flexible sheet is a microperforated, water-insoluble polymeric sheet.
3. A wood preservative belt as claimed in claim 1 or claim 2, wherein the first flexible sheet is a waterinsoluble, water-impermeable polymeric sheet.
4. A wood-preservative belt as claimed in any one of the preceding claims, wherein the wood-preservative material has a viscosity of from above 1 to no more than 20 poise at 200C.
5. A wood-preservative belt as claimed in any one of the preceding claims, wherein the belt carries an adhesive which is capable of sticking at least a portion of the second flexible sheet to the pole.
6. A wood-preservative belt as claimed in claim 5, wherein the belt carries at least one adhesive strip for attaching the belt to the pole.
7. A wood-preservative belt as claimed in any one of the preceding claims, wherein the first and second flexible sheets are secured to one another so as to form sachets of wood-preservative material.
8. A wood-preservative belt as claimed in any one of the preceding claims, wherein the belt comprises a third flexible sheet which forms a cover for the second flexible sheet.
9. A method for the ground line treatment of a wooden pole comprising the following steps: (1) attaching a wood-preservative belt as claimed in any one of claims 1 to 7 to the pole with the second flexible sheet in contact with the pole; and (2) applying a sufficient pressure to the first flexible sheet so as to cause the wood-preservative material to pass through the second flexible sheet and thereby contact and treat the wooden pole.
10. A wood preservative belt or a method for treating wooden poles substantially as heinbefore described and with reference to the drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB919125093A GB9125093D0 (en) | 1991-11-22 | 1991-11-22 | Wood-preservative belt and method for preserving wood |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9224088D0 GB9224088D0 (en) | 1993-01-06 |
| GB2261682A true GB2261682A (en) | 1993-05-26 |
| GB2261682B GB2261682B (en) | 1995-03-08 |
Family
ID=10705248
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB919125093A Pending GB9125093D0 (en) | 1991-11-22 | 1991-11-22 | Wood-preservative belt and method for preserving wood |
| GB9224088A Expired - Fee Related GB2261682B (en) | 1991-11-22 | 1992-11-17 | Wood-preservative belt and a method for preserving wood |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB919125093A Pending GB9125093D0 (en) | 1991-11-22 | 1991-11-22 | Wood-preservative belt and method for preserving wood |
Country Status (2)
| Country | Link |
|---|---|
| GB (2) | GB9125093D0 (en) |
| IE (1) | IE66190B1 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4779735A (en) * | 1987-06-10 | 1988-10-25 | Mooney Chemicals, Inc. | Wood-preservative package |
| WO1992016341A1 (en) * | 1991-03-18 | 1992-10-01 | Saneish Pty. Ltd. | Wood preservative applicator |
-
1991
- 1991-11-22 GB GB919125093A patent/GB9125093D0/en active Pending
-
1992
- 1992-11-11 IE IE922809A patent/IE66190B1/en not_active IP Right Cessation
- 1992-11-17 GB GB9224088A patent/GB2261682B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4779735A (en) * | 1987-06-10 | 1988-10-25 | Mooney Chemicals, Inc. | Wood-preservative package |
| WO1992016341A1 (en) * | 1991-03-18 | 1992-10-01 | Saneish Pty. Ltd. | Wood preservative applicator |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9125093D0 (en) | 1992-01-22 |
| GB9224088D0 (en) | 1993-01-06 |
| GB2261682B (en) | 1995-03-08 |
| IE922809A1 (en) | 1993-06-02 |
| IE66190B1 (en) | 1995-12-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19981117 |