AU1885602A - Material treatment installation and method - Google Patents
Material treatment installation and method Download PDFInfo
- Publication number
- AU1885602A AU1885602A AU18856/02A AU1885602A AU1885602A AU 1885602 A AU1885602 A AU 1885602A AU 18856/02 A AU18856/02 A AU 18856/02A AU 1885602 A AU1885602 A AU 1885602A AU 1885602 A AU1885602 A AU 1885602A
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- Australia
- Prior art keywords
- treatment
- liquid
- reservoir
- batch
- space
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- 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.)
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- Chemical And Physical Treatments For Wood And The Like (AREA)
Description
P/00/0o11 Regulation 3.2
AUSTRALIA
Patents Act 1990
ORIGINAL
COMPLETE SPECIFICATION STANDARD PATENT Invention Title: MATERIAL TREATMENT INSTALLATION METHOD a The following statement is a full description of this invention, a Applicant: TIMBERELO PTY LTD including the best method of performing it known to me: V:AmAnda\Pat\PO\638253CAP.doc MATERIAL TREATMENT INSTALLATION AND METHOD The present invention relates to material treatment, and more particularly to an installation and method for material treatment.
The present invention has particular application to the timber industry and, specifically, to the treatment of timber with a liquid substance to protect or enhance the qualities of the timber. It will therefore be convenient to hereinafter describe the invention in this context. It should be appreciated, however, that 10 the present invention is not limited to use within the timber industry, but that it may be suitable for use in a broad range of applications where treatment with a liquid is required, especially where that treatment involves immersion or saturation.
Most timbers used in the construction industry, such as logs, structural framing and fence batons, are not naturally resistant to rot and/or to termites (otherwise known as white ants). Accordingly, timber for the construction V.•0 industry is typically chemically treated to protect it against damage from termites .00 0or rot when it is in service. The chemical treatment process has traditionally required immersion of the timber in a bath of a treatment liquid. This process has the disadvantage, however, that it does not lend itself to high volume rates of timber treatment. Part of the reason for this is the additional disadvantage that the process requires packs of the timber to be lifted into and out of the treatment bath. The equipment required to hoist the packs of timber into and out of a chemical bath, and also ensure their immersion, is not only unsuited to high volume rates of treatment, but also cumbersome and costly.
Thus, it would be desirable to provide a timber treatment installation and method which overcomes these disadvantages.
According to one aspect, the present invention provides an installation for material treatment including a treatment chamber defining a treatment space, the treatment chamber being adapted to receive a batch of material to be treated within the treatment space. The installation further includes liquid W:\pwg pat\TimberfloComplete.doc transfer means for transferring a quantity of treatment liquid from a supply of said treatment liquid into the treatment chamber to contact and treat the batch of material received within the treatment space. The installation preferably includes a reservoir for holding a quantity of treatment liquid which is separate from the treatment space, this reservoir forming the treatment liquid supply.
The liquid preferably floods the treatment space to thereby immerse the batch of material. The liquid transfer means is furthermore preferably adapted to remove the treatment liquid from the treatment chamber once treatment of the material is complete. For example, after treatment of the material is complete, 10 the liquid transfer means preferably transfers the treatment liquid back into the reservoir.
In a preferred embodiment of the invention, the treatment space and the reservoir are adjacent one another and are separated by a wall or partition.
That is, the installation preferably includes a partition which forms a barrier separating the treatment space of the treatment chamber from the reservoir.
Nevertheless, the treatment chamber and the reservoir of the installation are desirably in fluid communication to enable ready transfer of the treatment liquid between the two by the liquid transfer means.
In a preferred embodiment of the invention the partition separating the treatment space from the reservoir includes at least one, and preferably more than one, aperture providing fluid communication between the reservoir and the treatment space. The apertures preferably extend through the partition and are adapted for passage of the treatment liquid to and from the treatment space.
In a particularly preferred embodiment of the invention, an elongate conduit extends from each aperture through the partition into the reservoir located adjacent the treatment chamber. Preferably, each conduit has openings along its length for passage of the treatment liquid. Each of the elongate conduits may be integrally formed, or at least rigidly connected with, the partition between the treatment space and the reservoir.
W:pwg pat\TimberffoComplete.doc In a particularly preferred embodiment of this invention, the treatment chamber is located above the reservoir. Furthermore, a base of the treatment chamber preferably forms or constitutes the partition that separates the treatment space from the reservoir.
Thus, in a particularly preferred embodiment of this invention, the treatment chamber and reservoir of the material treatment installation are incorporated into an integral vessel or tank, with the treatment chamber comprising an upper part of that vessel or tank and the treatment liquid 10 reservoir comprising a lower part.
The liquid transfer means of the invention may include a pump of any conventional type for pumping the treatment liquid from the reservoir into the treatment chamber and vice versa. More preferably, however, the liquid transfer means includes the one or more elongate conduit and aperture through S-the partition that separates the treatment space from the reservoir, in combination with a gas pressure source adapted to pressurise an air space above the level of the liquid in the reservoir. Pressurising the air space above the treatment liquid forces the liquid into and along each conduit and through each partition aperture to flood the treatment space of the adjacent treatment i chamber. The liquid transfer means is also preferably designed to create a "negative pressure in the reservoir to at least assist movement of the liquid back through each partition aperture into the reservoir again once the material treatment has been completed. In this regard, the gas pressure source may also be adapted to pressurise an air space above the flooded treatment space of the treatment chamber.
In a preferred embodiment of the invention the treatment chamber includes at least one portal for the entry and/or exit of the material to and/or from the treatment chamber. The at least one portal is preferably movable between an open position enabling inlet of a batch of material to be treated and/or outlet of a batch of treated material to and/or from the treatment chamber, respectively, and (ii) a closed position to seal the treatment chamber while the treatment space is flooded with the treatment liquid. In the closed W:Vpg- pat\TimberfloComplete.doc position, the at least one portal preferably provides a substantially hermetic seal against leakage of the treatment liquid.
In one embodiment of the invention, the treatment chamber of the installation has only a single portal, which functions for both inlet and outlet of the batch of material from the chamber. In a more preferred arrangement, however, the chamber has two separate portals, one of which is specifically for entry of a batch of material to be treated and the other of which is specifically for exit of the batch of treated material. The inlet and outlet portals are preferably 10 provided at opposite ends of the treatment chamber.
Importantly, in a most preferred embodiment of this invention, each portal provides access for the batch of material to and/or from the treatment chamber of the installation in a substantially lateral or horizontal direction.
In a preferred embodiment of the invention, the installation includes conveyor means for transporting the batch of material into and/or out of the treatment space of the treatment chamber. The conveyor means is preferably adapted to transport the material substantially horizontally. Furthermore, the conveyor means preferably extends laterally through the treatment chamber.
As mentioned previously, one important application for the present invention is the chemical treatment of timber against rot and/or termites. In this scenario, the batch of material to be treated comprises a batch of timber in the form of a collection of strips, beams or planks preferably bundled together into a pack. The installation of the invention enables the treatment liquid to be transferred from a reservoir into contact with the pack of timber rather than having to lift the pack into and then out of a treatment liquid bath. The invention enables the requirement of lowering and subsequently raising the timber pack into and out of the chemical bath to be eliminated. The batch of timber can be simply conveyed horizontally into the treatment chamber which is then sealed and flooded to immerse the timber for the required time after which the treatment space is again drained of the treatment liquid enabling the chamber to again be opened and the now treated timber to be directly conveyed away. The W: Ng pat\TimberfloComplete.doc 6 installation of the invention therefore enables batches of timber to be chemically treated at substantially increased rates.
According to another aspect, therefore, the present invention also provides a method of material treatment including the steps of: positioning a batch of material to be treated in a treatment space; transferring treatment liquid from a separate treatment liquid reservoir to contact the batch of material in the treatment space; retaining the treatment liquid in contact with the material in the treatment 10 space for a predetermined period of time to effect the required treatment; and removing the treatment liquid from the treatment space after the predetermined period of time.
In a preferred embodiment of the invention, the step of removing the treatment liquid from the treatment space after the predetermined period of time involves returning the treatment liquid back into the reservoir.
In a preferred embodiment of the invention, the treatment space is within a treatment chamber. In a preferred embodiment of the invention, therefore, the step of positioning the batch of material in the treatment space includes conveying the batch substantially horizontally into the treatment chamber.
In a preferred embodiment of the invention, the treatment method further includes the step of removing the treated batch of material from the treatment chamber after the treatment liquid has been returned to the reservoir. The step of removing the batch of material preferably includes conveying the batch substantially horizontally out of the treatment chamber.
In a preferred embodiment of the invention, the step of transferring the liquid to the treatment space includes pressurising an air space above the liquid in the reservoir to force the treatment liquid along conduits in fluid communication with the treatment chamber. Preferably, the step of transferring the liquid to the treatment chamber includes flooding the treatment space to fully immerse the batch of material.
W tpg pat\TimberfloComplete.do c According to a further aspect, the invention also provides material, such as timber, which has been treated according to the method described above.
The installation of the present invention is preferably integrated in a timber production plant, which may include milling and/or packing of timber.
For assistance in arriving at a more complete understanding of the present invention, preferred embodiments of the material treatment installation 10 and corresponding method according to this invention are hereafter described with reference to the accompanying drawings, in which like reference characters designate like features, and in which: Fig. 1 is schematic side view of an installation for the chemical treatment of timber according to one embodiment of invention; ,i Fig. 2 shows detail of the treatment installation illustrated in Fig. 1; Fig. 3 shows detail in side view of an installation for the chemical treatment of timber according to another embodiment of invention; Fig. 4 is an end view of the installation illustrated in Fig. 3; Fig. 5 is a plan view of the material treatment installation of Fig. 1 shown in relation to part of a building of a timber production and processing plant incorporating the installation; and Fig. 6 is a section view in the direction of arrows A-A in Fig. Referring to Figs. 1 and 2 of the drawings, the example of the present invention shown is an installation for the chemical treatment of timber against damage from termites and/or rot. The installation includes a treatment chamber defining a treatment space within it. The treatment chamber is adapted to receive a batch of timber in the form of a collection of W:\pwg pat\TimberfloComplete.doc 8 timber planks or beams strapped together in a pack within the treatment space The installation also includes a substantially horizontal conveyor which is typically driven by hydraulic motors although other drive systems are also possible. The conveyor extends through the treatment chamber and is adapted to transport the pack of untreated timber in the direction of the arrow into the treatment space within the chamber.
The treatment chamber includes a portal or door at an upstream end to permit entry of the untreated timber pack into the treatment space, 10 and another portal or door at a downstream end for exit of the pack of timber after treatment is complete. Each of the doors is movable between an open position which permits inlet or outlet of a timber pack to or from the treatment chamber respectively, and a closed position which substantially seals the treatment chamber against leakage.
The installation furthermore includes a reservoir (10) for holding a quantity of treatment liquid (11) separate from the treatment space of the treatment chamber. The treatment liquid (11) in this instance is a chemical ***formulation designed to protect the timber against termites and/or rot when it is exposed to such elements in service. The reservoir (10) is located adjacent to and below the treatment chamber and may be combined with the treatment chamber in a common structure. A partition which forms the base of the treatment chamber, acts as a barrier separating the treatment space (3) from the reservoir In this particular example the reservoir is recessed into the ground, but it certainly need not be. The partition (12) includes a plurality of apertures therethrough providing fluid communication between the reservoir and the treatment space. An elongate conduit (14) in the form of an openended tube extends from each aperture (13) into the reservoir Thus, the conduits (14) and associated apertures (13) provide for passage of the treatment liquid (11) between the reservoir (10) and the treatment space (3) above.
The conduits (14) and apertures (13) combine with a gas pressure source (15) a source of compressed air) to form a means for transferring W:\pwg pat\TimberfloComplete.doc 9 the treatment liquid (11) from the reservoir (10) into the treatment space of the treatment chamber to immerse the timber pack therein. When a pack (4) of untreated timber is received in the treatment space the doors are closed and the pressure source (15) delivers compressed air via a pipeline (16) into the reservoir This pressurises the air space (17) above the level of liquid in the reservoir forcing the treatment liquid through each conduit (14) and its associated aperture (13) upwards into the treatment chamber. The treatment liquid (11) thereby floods the treatment space fully immersing the timber pack received within the treatment space. Brace elements (18) in the 10 treatment chamber prevent the timber pack from floating upwards under the influence of its natural buoyancy as the treatment liquid fills the treatment space.
The timber remains in fully immersed contact with the treatment liquid for a predetermined period of time, after which the positive pressurisation of the reservoir air space (17) is removed, enabling the treatment liquid (11) to drain back into the reservoir (10) under gravity. Preferably, however, the pressure source (15) is employed to create a negative pressure in the reservoir air space and/or to pressurise an air space (19) above the treatment space via a pipeline (20) to assist or facilitate evacuation of the treatment liquid from the treatment space back into the reservoir Once treatment of a timber pack is complete, the doors of the treatment chamber are opened, the pack of treated timber is discharged from the treatment chamber through the door by the conveyor in the direction of arrow and a fresh pack of yet-to-be-treated timber is conveyed through the door to into the treatment space The doors are then closed and the process repeated.
Figs. 3 and 4 of the drawings illustrate an embodiment of the timber treatment installation of the invention in a somewhat less schematic and more detailed configuration. Like reference characters designate like features compared with Figs. 1 and 2. In this embodiment, the width of the reservoir can be seen in Fig. 4 to extend beyond the width of the treatment chamber W:pwg patfTimberfloComplete.doc Furthermore, in this embodiment, the conveyor does not actually extend through the sliding inlet and outlet doors but is fully within the chamber (2) and cooperates with additional conveyors (not shown) outside the chamber for transport of the packs of timber (4).into and out of the treatment chamber The brace elements (18) in this embodiment are also hydraulically adjustable to readily accommodate different sized timber packs Another difference is that the partition base (12) of the treatment chamber declines towards the outlet door to assist the drainage of the treatment liquid back into the reservoir.
The doors are designed to slide on rails between their respective open and 10 closed positions, with the inlet door shown in the open position in Fig. 4.
As is clear from Fig. 5, the installation of the invention is readily incorporated into a plant for timber production. The installation may process timber packs from a stock supply of the plant. The packs are delivered to the conveyor from a stock source via an in-feed chain conveyor. After treatment in the treatment chamber the treated packs are delivered to an intermediate storage rack As can be seen from Fig. 6, the rack (21) includes a frame which supports the treated packs at an angle to assist final drainage of the treatment liquid (11) from the timber. Rollers (23) or some other handling system may be provided to assist movement of the packs along the frame (22) at the steep drain angle. A drip tray (24) beneath the packs collects any residual liquid (11) running off the timber. After a predetermined period of drainage, a fork truck (25) or some other conveyor means is used to transfer the treated timber packs to a dispatch area.
Advantageously, the installation of the invention enables the chemical treatment of timber to be converted into a line process, resulting in substantially increased rates of processing. The invention renders it unnecessary to lift the timber into and then out of a treatment liquid bath. A batch of timber can be simply conveyed horizontally into the treatment chamber, which is then sealed and flooded to immerse the timber for the required time, after which the treatment space is drained of the treatment liquid enabling the chamber to again be opened and the now treated timber to be directly conveyed away.
W:Apwg pat\TimberfloCompete.doc 11 The material of fabrication for the treatment chamber and reservoir may be any of a collection of suitable materials, including metals (such as stainless steel) or polymer plastics, or a combination of both. Importantly, however, the structure of the installation should be chemically inert with respect to the treatment liquid, and should preferably also facilitate cleaning. The physical dimensions of the installation will naturally depend upon the size and shape of the material to be treated. In the embodiment shown in Figs. 3 and 4, the treatment chamber is designed to be about 6.2m long x 2.25m high x 1.35m wide. The reservoir is about 6.2m long x 0.85m high x 2.8m wide.
."Finally, it is to be understood that various modifications and/or additions may be made to the material treatment installation and method described above with departing from the spirit or ambit of the present invention.
i5 W:\pg pat\TimberfoComplete.doc
Claims (33)
1. An installation for material treatment including: a treatment chamber defining a treatment space, the treatment chamber being adapted to receive a batch of material to be treated within the treatment space; and liquid transfer means for transferring treatment liquid from a treatment liquid supply into the treatment chamber to contact and treat the batch of material which is received within the treatment space.
2. An installation according to claim 1, including a reservoir for holding a quantity of the treatment liquid separate from the treatment space, the reservoir forming the treatment liquid supply.
3. An installation according to claim 2, wherein the treatment space and the reservoir are adjacent one another and in fluid communication to enable ready transfer of the treatment liquid between the two by the liquid transfer means.
4. An installation according to claim 3 wherein the treatment space and the reservoir are separated by a wall or partition that forms a barrier therebetween.
An installation according to claim 4 wherein the partition separating the treatment space from the reservoir includes at least one, and preferably more than one, aperture providing fluid communication between the reservoir and the treatment space.
6. An installation according to claim 5, wherein the apertures extend through the partition and are adapted for passage of the treatment liquid to and from the treatment space.
7. An installation according to claim 6, wherein an elongate conduit extends from each aperture through the partition into the reservoir located adjacent the treatment chamber for conducting flow of the treatment fluid between the reservoir and the treatment chamber. W:pwg pat\TimbefloComplete.doc 13
8. An installation according to claim any one of claims 2 to 7, wherein the treatment chamber and reservoir are incorporated into an integral vessel or tank, with the treatment chamber comprising an upper part of that vessel or tank and the treatment liquid reservoir comprising a lower part.
9. An installation according to claim any one of claims 2 to 7, wherein the reservoir comprises a vessel or tank separate from the treatment chamber.
10. An installation according to any one of the preceding claims, wherein the liquid transfer means is adapted to remove the treatment liquid from the :"treatment chamber once treatment of the material is complete.
11. An installation according to claim 10, wherein the liquid transfer means is adapted to transfer the treatment liquid from the treatment chamber back into the reservoir once treatment of the material is complete.
12. An installation according to any one of the preceding claims, wherein the treatment liquid is intended to flood the treatment space to thereby immerse the batch of material.
13. An installation according to any one of claims 6 to 12, wherein the liquid transfer means includes the one or more elongate conduit and aperture through the partition that separates the treatment space from the reservoir, in combination with a gas pressure source adapted to pressurise an air space above the level of the liquid in the reservoir.
14. An installation according to claim 13, wherein the liquid transfer means is designed to create a negative pressure in the reservoir to assist movement of the liquid back into the reservoir after the material treatment has been completed.
W:\pwg pat\TimberfloComplete.doc 14 An installation according to claim 14, wherein the gas pressure source is adapted to pressurise an air space above the flooded treatment space of the treatment chamber to assist movement of the liquid back into the reservoir.
16. An installation according to any one of the preceding claims, wherein the treatment chamber includes at least one portal for the entry and/or exit of the material to and/or from the treatment chamber.
17. An installation according to claim 16, wherein the at least one portal is 10 movable between an open position enabling inlet of a batch of material to be treated and/or outlet of a batch of treated material to and/or from the treatment chamber, respectively, and (ii) a closed position to seal the treatment chamber while the treatment space is flooded with the treatment liquid.
18. An installation according to claim 17, wherein the treatment chamber has only a single portal, which functions for both inlet and outlet of the batch of material from the chamber.
19. An installation according to claim 17, wherein the treatment chamber has two separate portals, one of which is specifically for entry of a batch of material to be treated and the other of which is specifically for exit of the batch of treated material.
An installation according to claim 19, wherein the inlet and outlet portals are provided at opposite ends of the treatment chamber, and wherein each portal provides access for the batch of material to and/or from the treatment chamber in a substantially lateral or horizontal direction.
21. An installation according to any one of the preceding claims, including conveyor means for transporting the batch of material into and/or out of the treatment space of the treatment chamber. W:pwg paI\TimberfloComplete.doc
22. An installation according to claim 21, wherein the conveyor means is adapted to transport the material substantially horizontally, and extends laterally through the treatment chamber.
23. An installation according to any one of the preceding claims, wherein the batch of material to be treated comprises a batch of timber in the form of a collection of strips, beams or planks bundled together into a pack.
24. A method of material treatment including the steps of: 10 positioning a batch of material to be treated in a treatment space; transferring treatment liquid from a separate treatment liquid reservoir or supply to contact the batch of material in the treatment space; retaining the treatment liquid in contact with the material in the treatment space for a predetermined period of time to effect the required treatment; and removing the treatment liquid from the treatment space after the predetermined period of time.
A method according to claim 24, wherein the step of removing the treatment liquid from the treatment space after the predetermined period of time involves returning the treatment liquid back into the reservoir. o*
26. A method according to claim 24 or claim 25, wherein the treatment space is within a treatment chamber, and wherein the step of positioning the batch of material in the treatment space includes conveying the batch substantially horizontally into the treatment chamber.
27. A method according to any one of claims 24 to 26, further including the step of removing the treated batch of material from the treatment chamber after the treatment liquid has been returned to the reservoir.
28. A method according to claim 27, wherein the step of removing the batch of material includes conveying the batch substantially horizontally out of the treatment chamber. W:' 4 wg pat\TimberfloComplete.doc 16
29. A method according to any one of claims 24 to 28, wherein the step of transferring the liquid to the treatment space includes pressurising an air space above the liquid in the reservoir to force the treatment liquid along conduits in fluid communication with the treatment chamber.
A method according to any one of claims 24 to 29, wherein the step of transferring the liquid to the treatment chamber includes flooding the treatment space to fully immerse the batch of material. 10
31. Timber which has been treated according to the method claimed in any one of claims 24 to
32. An installation for material treatment substantially as herein described with reference to the accompanying drawings.
33. A method of material treatment substantially as herein described with reference to the accompanying drawings. DATED: 1 March 2002 PHILLIPS ORMONDE FITZPATRICK Attorneys for: TIMBERFLO PTY LTD 1990sA^" S W:\pw pat\TimberfloComplete.doc
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU18856/02A AU1885602A (en) | 2001-03-01 | 2002-03-01 | Material treatment installation and method |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPR3463A AUPR346301A0 (en) | 2001-03-01 | 2001-03-01 | Material treatment installation and method |
| AUPR3463 | 2001-03-01 | ||
| AU18856/02A AU1885602A (en) | 2001-03-01 | 2002-03-01 | Material treatment installation and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU1885602A true AU1885602A (en) | 2002-09-05 |
Family
ID=25617361
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU18856/02A Abandoned AU1885602A (en) | 2001-03-01 | 2002-03-01 | Material treatment installation and method |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU1885602A (en) |
-
2002
- 2002-03-01 AU AU18856/02A patent/AU1885602A/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PC1 | Assignment before grant (sect. 113) |
Owner name: INDUSTRY SYSTEMS PTY LTD Free format text: THE FORMER OWNER WAS: TIMBERFLO PTY LTD |
|
| MK1 | Application lapsed section 142(2)(a) - no request for examination in relevant period |