JPH03258363A - Lumber treating equipment - Google Patents

Abstract

PURPOSE:To rapidly dry the treated lumber by sucking air into a treatment chamber and causing an air flow around lumber and removing excess treatment liquid from lumber and discharging this excess treatment liquid together with the air from the treatment chamber and collecting it. CONSTITUTION:An inlet part 32 and an outlet part 34 for lumber are provided to the side wall of a treatment chamber 30. Further the discharge openings 52b, 54b for discharging the air in the treatment chamber 30 are arranged to the positions higher than the inlet part 32 and the outlet part 34. Moreover a sucking and exhausting means 60 sucks air into the treatment chamber 30 from the gaps between the inlet part 32, the outlet part and lumber passed therethrough. The air flow is caused around lumber and discharged from an opening for discharge. A storage tank 56 is connected to this opening and arranged to collect the excess treatment liquid discharged together with the air by this sucking and exhausting means 60. As a result, the treatment liquid is saved and also drying time of the lumber after treatment is shortened and furthermore clean work is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an apparatus for treating wood with treatment liquids such as paints, stains and preservatives.

[Conventional technology]

Known equipment of this type, including what are called spray and brush priming machines, is used for painting wooden parts in the joinery industry. In such an undercoat machine, paint is supplied from a main paint storage tank via an undercoat pump and sprayed from a nozzle, and soaks into the wood. The wood is conveyed into the machine and passed through the spreading area by means of a simple conveying and feeding device, namely driven rollers and idle pressing rollers. This spray area soaks the paint onto all sides of the wood. After passing through this spreading area, a number of stationary brushes remove excess paint and level the paint on the surface. The fixed brush is adjustable in width and thickness to suit the wood being coated.

[Problem to be solved by the invention]

Such machines can cause paint to build up on the brushes in a relatively short period of time, excess paint drips from the wood being coated as it exits the machine, poor quality of the finish, and overuse of paint. Extended drying time is required before the wood can be used or delivered to the site. Furthermore, the work area is very dirty and the operator requires protective clothing. Therefore, the cost of this method is very high.

An object of the present invention is to provide a wood processing device that can perform clean operations, use less processing liquid, and quickly dry treated wood.

[Means to solve the problem]

This purpose, according to the invention, is such that the processing chamber has an inlet and an outlet for the wood provided in its side wall and an inlet and an outlet for the wood arranged in a position above the inlet and the outlet for discharging the air inside the processing chamber. and a suction/exhaust means for sucking air into the processing chamber through a gap between the inlet and outlet portions and the wood passing therethrough, creating an air flow around the wood, and discharging the air from the discharge opening. This is achieved in that a storage tank is connected to the discharge opening for collecting the excess processing liquid discharged together with air by the suction and exhaust means.

In this case, a discharge opening for discharging the air is formed by the upper end of a duct arranged in the processing chamber and extending substantially downward;
Said upper end of the duct forms a weir, air containing surplus processing liquid is discharged from the processing chamber via the weir by suction and exhaust means, and the surplus processing liquid is deposited at the lower end of the duct or below the duct for reuse. It is desirable to be supplemented.

Furthermore, it is preferable to provide means for supplying the processing liquid into the processing chamber from the bottom of the processing chamber.

It is further desirable to include means for spraying the treatment liquid onto the wood and means for brushing off excess treatment liquid from the sprayed wood before the wood passes through the treatment chamber.

Furthermore, the brush means comprises a number of rotating brushes, some of which are arranged to rotate about an axis parallel to the direction of supply of wood, and other brushes arranged to rotate about an axis parallel to the direction of supply of wood. Preferably, the device is arranged to rotate about a vertical axis.

Furthermore, it is preferred that one or more guides for holding the wood are arranged inside or outside the inlet and outlet sections.

〔Example〕

The invention will now be described by way of example with reference to the accompanying figures.

1 and 2, the wood, ie the sawn timber to be treated, passes between a feed roller 10 driven by a geared drive 12 and an adjustable upper feed roller 14. is supplied to the spray area 16. In this spray area, paint, stain, or other treatment liquid enters the nozzle 1.
8, it is sprayed from all directions. This processing liquid is supplied from the tank 20 to the nozzle 18 by a pump 22. For each piece of wood soaked with paint, use the upper brush 2.
4. Passing between the lower brush 26 and the side brushes 28, excess paint is removed from all surfaces of the wood. The brushes are driven by a common geared drive, not shown. The brushes 24, 26 rotate about axes perpendicular to the wood supply direction, and the brushes 28 rotate about an axis parallel to the wood supply direction. Excess paint removed by the brush returns to tank 20. These brushes, which are preferably cylindrical in shape, are adjustable to suit different thicknesses and widths of wood. A variety of brushes can be used depending on the type of coating being applied. Brush 24.
26. Other devices that use vacuum after passing through 28
Remove any remaining excess treatment solution, coat the wood evenly, and let dry.

The vacuum device includes a vacuum chamber 30 (see FIG. 2). The vacuum chamber 30 has an inlet section 32 and an outlet section 34, the inlet section 32 and the outlet section 34 being provided with a template 36 shaped to match the cross-sectional shape of the wood to be treated. A cylindrical wire brush pressure roller 38 (FIG. 1) is arranged adjacent to the inlet and outlet sections. This pressure roller guides the wood as it enters and exits the vacuum chamber. The wire brush pressure roller 38 is adjustable to suit the width and thickness of the wood and is rotatable to prevent the wood from shifting when entering and exiting the vacuum chamber. (not driven by a drive).

The vacuum chamber 30 is generally rectangular box-shaped and has a bottom wall 40, end walls 42, 42, side walls 46, 48, and a top wall 50. The top wall may be in the form of an inspection lid. Entrance part 3
2 and outlet section 34 are provided in the end walls 42, 4.4, respectively. Adjacent to the side walls 46 , 48 a pair of ducts 52 , 54 of rectangular cross section extend upwardly into the vacuum chamber 30 . The upper open end of this duct has one wall 50
and above the level of the inlet section 32 and the outlet section 34, i.e. above the top surface of the wood as it passes through the vacuum chamber 30. The lower open ends 52a and 5Ja of the duct are the vacuum chambers 30
It extends to the lower side of the tank and communicates with the main tank 56 (FIG. 1).

The main tank 56 is further connected to one or more vortex blowers 60 via baffles A, B and C and a filter 58. The size of this blower is determined by the maximum cross section of the wood to be treated.

By pumping down the tank 56 and thus the vacuum chamber 30 via the duct 5254, a high velocity air flow is created through the unavoidable gap between the wood and the template 30 surrounding it. Air flows across the wood in this area and exits the vacuum chamber 30 via ducts 52,54. Any excess coating solution remaining on the wood is removed by this air stream and flows over the weir formed by the duct edges 52b, 54b and then returned to the main tank 56. This processing liquid is collected in this main tank and returned to the spray N area 16 through a return pipe 62.

With the device described above, the cost of the coating solution is saved by more than 30%. The drying time can be cut in half or less.

The above embodiment includes three steps: spraying, brushing and vacuuming. In particular, when the treatment liquid to be supplied is water-based, such as a water-based paint, spraying and brushing can be omitted, as shown in the embodiment of FIG.

In FIG. 3, the apparatus includes a main tank 64, into which coating liquid is supplied by means not shown. The tank 64 has steel deflectors C, D, such as the deflectors A, B, C of the embodiment of FIGS. Equipped with a vortex blower vacuum system. The coating solution is transferred from the bottom of the tank 64 to the pipe 6 by means not shown.
6 and is discharged upward into the processing chamber 68.

The wood 70 to be treated enters the treatment chamber from the input lower 2,
Exit from Exit Roa 4. The processing chamber 68 is of the same construction as the vacuum chamber 30 of FIG. 2, except that the bottom wall 40' is provided with a cutout for a tube 66 leading to the processing liquid from the main tank 64.

The tube 66 opens into a treatment chamber 68 below the wood 70 and in the center of the bottom wall 40'. As mentioned above, the two ducts each having a rectangular cross section and whose upper ends form a dam are connected at their lower ends to the main tank 64 from which suction and exhaust are carried out. Air is thereby drawn out of the processing chamber 68 . By suctioning air, the treatment liquid is returned to the main tank 64 at high speed through the gap around the wood formed by the weir and template, and the treatment liquid supplied from the pipe 66 is lifted upward. A vortex of this liquid is formed that contacts the earthen walls of the processing chamber 68, crosses the two weirs, and returns to the main tank 64 by gravity. The wood passing through the vacuum chamber passes through a vortex of treatment liquid and leaves the treatment chamber fully coated. At the same time, the area 72 where the wood enters and exits the processing chamber
．． Within 74, a strong inwardly directed air flow is created. This airflow acts to remove excess paint from the wood.

Regulation and control of the air just before it leaves the processing chamber is performed by a vacuum control valve (not shown).

The wood parts inside the processing chamber 68 are held in position by two adjustable plastic lateral guides and/or two adjustable plastic roller guides 80. 20 Roller guides are located above the wood at the entrance 72 and exit 740 locations.

This wood treatment device has proven to be particularly advantageous for use in the application of water-based paints due to the turbulence generated by the vacuum. Antifoaming agents added to the coating material prevent excessive foaming under vacuum.

〔Effect of the invention〕

As explained above, in the present invention, air is sucked into the processing chamber to create an air flow around the wood, thereby removing excess processing liquid from the wood, and discharging this excess processing liquid from the processing liquid together with the air. Since the wood is collected, the quality of the wood surface finish is good and the processing liquid can be saved. Additionally, the drying time of the wood after treatment is reduced since the air flow sufficiently removes excess treatment liquid. Furthermore, the wood treatment operation according to the present invention is a clean operation since the treatment liquid is not scattered around.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of an embodiment of a wood processing apparatus according to the invention, FIG. 2 is a perspective view showing details of the vacuum chamber of the embodiment of FIG. 1, and FIG. FIG. 2 is a side view of the second embodiment. 30.68...Processing chamber, 32.72...Inlet section,
34.74...Exit part, 52b54b...Discharge opening, 56.64...Storage tank, 60...Suction/exhaust means, Fig. 2

Claims (1)

[Claims] 1. The processing chamber has a wood inlet and an outlet provided on its side wall, and is arranged above the inlet and the outlet for discharging air within the processing chamber. a suction/exhaust means for sucking air into the processing chamber through a gap between the inlet and outlet parts and the wood passing therethrough, creating an air flow around the wood, and discharging it through the exhaust opening; An apparatus for treating wood using a treatment liquid, characterized in that a storage tank for collecting surplus treatment liquid discharged together with air by the suction/exhaust means is connected to the discharge opening. 2. A discharge opening for discharging air is formed by an upper end of a duct arranged in the processing chamber and extending substantially downward, and the upper end of the duct forms a weir, and the air containing excess processing liquid is sucked and exhausted into the processing chamber by the suction and exhaust means. 2. The wood processing device according to claim 1, wherein the processing liquid is discharged through a weir and the surplus processing liquid is collected at the lower end of the duct or below the duct for reuse. 3. The wood processing apparatus according to claim 1 or 2, further comprising means for supplying the processing liquid into the processing chamber from the bottom of the processing chamber. 4. Claim characterized in that it comprises means for spraying a treatment liquid onto the wood, and means for brushing off excess treatment liquid from the sprayed wood before the wood passes through the treatment chamber. 1. The wood processing device according to 1. 5. The brush means comprises a number of rotating brushes, some of which are arranged to rotate about an axis parallel to the wood feeding direction, and other brushes are arranged to rotate about an axis parallel to the wood feeding direction. 5. Wood processing device according to claim 4, characterized in that it is arranged to rotate about a vertical axis. 6. According to any one of claims 1 to 5, characterized in that one or more guides for holding the wood are arranged inside or outside the inlet and outlet parts. Wood processing equipment.