FI104802B - Method for fixing timber preservative agent - Google Patents

Description

This invention relates to a wood preservative fastening system according to the preamble of claim 1.

In wood impregnation, after impregnation, the impregnating agent (wood preservative) must be applied by heating the impregnated wood at a predetermined temperature for a predetermined holding time. The temperature and holding time depend on the dimensions of the impregnated timber and the outside temperature, that is, the temperature the wood is exposed to after impregnation.

The attachment is necessary because at the time of impregnation the impregnating agent is water-soluble having a 6-chemical structure, after attachment the chemical structure has become 3-water insoluble and is thus harmless to the environment.

At present, steam is fixed under the impregnation cylinder by means of embedded steam generators, from which the steam is led through two tubes to the impregnation cylinder.

The disadvantage of the current method is that the steam is conducted through only two or a few tubes to the impregnation cylinder, whereby the heating is uneven and slow, which makes it impossible to be sure of a uniform result. Em. due to the fact that the impregnation cycle is long and thus expensive. In addition, the construction cost of the current method is very high.

The wood preservative attachment system of the invention provides a decisive improvement in the above disadvantages. To accomplish this, the wood preservative fastening system of the invention is characterized by what is set forth in the characterizing part of claim 1.

One of the main advantages of the invention is that when the wood preservative fastening system according to the invention is used, a uniform and secure attachment to the entire batch of treated wood is achieved quickly. The inventive fastening system is also easy to apply to existing impregnation facilities. The water used in the attachment is not wasted because it is discharged into the impregnation fluid reservoir, where it heats the impregnating agent (wood preservative) in the reservoir, so the invented system is also advantageous in terms of energy efficiency. The fastening is carried out in an impregnation cylinder, which results in a minimal transfer of timber. The fastening system can be integrated into the impregnation automation program, whereby the fastening can also be done automatically. Fixation is always carried out with new water so that no significant precipitate of wood preservative is formed. Furthermore, the invented system is almost completely maintenance-free.

The invention will now be described in detail with reference to the accompanying drawings, in which

Figure 1 is a partial sectional view of the impregnation cylinder and viewed perpendicular to the side.

Fig. 2 shows a heating element according to the invention, viewed from the bottom, perpendicular to the bottom.

Fig. 3 shows the heating member of Fig. 2 as viewed directly from the side.

Figure 4 is a cross-sectional view of the impregnation cylinder of Figure 1, viewed perpendicular to the end.

Fig. 5 shows a heating member attached to the impregnation cylinder of Figs. 1 and 4, viewed perpendicular to the end.

Figure 6 is a schematic view of a wood preservative fastening system according to the invention.

• · * 3 104802

Figures 1 and 4 partially show a previously known impregnation cylinder 1, e.g. with a pressure class PN 16. The impregnation cylinder 1 is provided with all the peripheral devices required for the village transport, e.g. vacuum and overpressure, they are not described in detail since they are all prior art. More particularly, a heating member 2 is attached to the underside of the impregnation cylinder 1, in the illustrated case the heating member 2 consists of tubes corresponding to the pressure class of the impregnation cylinder 1, preferably having a U-shaped loop and their ends bent through the wall 19 of impregnation cylinder outside the cylinder, the pipes are welded to the penetration wall 19 of the impregnation cylinder 1, shown in Fig. 5.

In Fig. 5, the heating element 2 is fixed to the bottom of the impregnation cylinder 1 by means of clips 18, the clamps 18 are formed of U-bended metal e.g. rectangular flat steel, they are welded at their ends to the wall 19 of the impregnation cylinder 1. Figure 5 also shows the previously known Vau dolls 17.

Figures 2 and 3 show the aforementioned heating member 2, it. connected to the heating element piping 12 (Fig. 6), e.g. by flange fittings or in any other known manner. The shape of the piping of the heating element 2 may be other than the above. The heating element 2 can be constructed in a manner other than that described above, e.g. by means of shielded electrical resistors.

- *; Fig. 6 is a schematic diagram illustrating a construction of a system for attaching a wood preservative according to the invention.

The diagram shows the following parts, impregnation cylinder 1, heating element 2, heat generating unit 3, hot water tank • · 4 104802 4, cold water pipe 5, shut-off valve 6, cooling water valve 7, hot water valve 8, defrost valve 9, heating pipe 10, heating pipe 10, heating pipe 10 electric resistor 14, overflow pipe 15 and vent pipe 16.

The heat-generating unit 3 may be a pre-existing heating plant for heating recycled water, utilizing district heat, electricity, wood, wood chips, peat or other known source of energy. The flow through unit 3 has all the necessary control valves, measuring devices and controls.

Preferably, the hot water tank 4 is an open system tank provided with an electric resistor 14, a heating conduit 10a inside the tank, either separately or both. Em. The water in the hot water tank 4 can be heated by means of electricity or a heat distribution unit known from, for example, district heating. In addition, the hot water tank 4 has an overflow pipe 15 which serves to prevent any possible damage caused by overfilling. The vent pipe 16 in the hot water tank 4 maintains the air pressure inside the tank at an amount equal to the outdoor pressure, not because it is an open system tank.

The hot water tank 4 is filled along the cold water pipe 5, has a cold water valve 7, by means of which the water flow is opened and closed. On both sides of the cold water valve 7 are shut-off valves 6 for maintenance work. The control of the cold water valve 7 and other controllable valves, such as the hot water valve 9, the heating valve 11 and the heating element valve 13, may be effected in some manner known in the art, e.g.

The water in the hot water tank 4 can be heated in addition to electricity by circulating in the heating piping 10a by means of heating pipes 10 e.g. 4.5 bar. pressurized water with a temperature of · 10410802 between 120 and 130 degrees Celsius. The heating can be controlled by the heating valve 11.

The hot water tank 4 has a hot water pipe 8 through which the hot water is directed to the impregnation cylinder 1. The hot water pipe 8 has a hot water valve 9 for directing the hot water.

The hot water tank 4 can advantageously be made of a known metal, in addition, it is advisable to isolate the heat in a known manner.

The heating of the heater 2 is effected by means of the heat generating unit 3, via the heating element piping 12. The heating element valve 13 in the heating element piping 12 controls the heating.

No impregnation fluid reservoir or other impregnation equipment other than the impregnation cylinder 1 is shown in the diagram. In addition, the chart lacks previously known measuring devices for temperature and pressure, which are required e.g. in the impregnation cylinder 1, in the hot water tank 4 in the heating element 2 and in the heating piping 10.

The invented wood preservative attachment system operates as follows.

«

Initial fixation The trees in the impregnation cylinder 1 are impregnated and the impregnating agent is returned to the impregnating agent container. The hot water tank 4 has a sufficient amount of hot water at a temperature of about 70 degrees. C.

The attachment is started by pumping vacuum into the impregnation cylinder 1 depending on the cylinder, 0.06-0.15 at which the hot water valve 9 is opened, whereby the hot water flows through the hot water pipe 8 into the impregnating cylinder · «Β 104802 whereby hot water flows through the timber to the bottom of the impregnation cylinder 1 over the entire length of the cylinder. After emptying, the hot water tank 4 begins to fill with clean water, leaving enough time for the water to warm up, if the same water is used every time to reheat, the precipitate of your village's core material becomes a problem in the water. There is so much water that the heating element 2 is covered with water, the amount of water required is very small compared to the volume of the entire impregnation cylinder 1. The water flowing over the wood at about 70 degrees cools down because it transfers part of its heat directly to the wood, which after impregnation has a temperature of about 25 degrees. C, the timber surface in contact with the hot water heats up instantly, causing the chemical reaction to start immediately, the aforementioned significantly shortening the fixing time. The piping of hot water over the timber can be improved, whereby the entire amount of wood in the interleaver 1 in Inter 1 is contacted with the hot water flowing down. The cooled hot water must be heated by means of the heating element 2 to a vaporization temperature dependent on the vacuum, it may be 0.06-0.15 at 37-54 degrees.

C, the warm steam thus formed fills the impregnation cylinder 1, thereby heating the wood inside. The overriding advantage of the invention is that steam is formed inside the impregnation cylinder 1 and over its entire length, so that the vapor spreads very quickly inside the entire impregnation cylinder 1, thereby rapidly and uniformly heating the entire amount of wood inside. As the steam warms the timber condensing it into water, the water flows down to the heating line 2 where it heats up and evaporates again. The evaporation is continued as long as a sufficient temperature of the timber is reached, the temperature is monitored by monitoring the vapor temperature of the top of the impregnation cylinder 1 (temperature is monitored by a measuring sensor located at the top of the impregnation cylinder 1).

The attachment is terminated by directing the normal atmospheric pressure t »« · 7 104802 to the impregnation cylinder 1, the bottom of which is led to the impregnation tank, where it helps maintain the impregnator temperature of about 28 degrees Celsius. Finally, the finished fixed timber is removed from the impregnation cylinder 1.

The control of the fastening system can be performed manually, partly automatically or completely automatically, by known methods, for example logic control or computer control system.

It will be apparent to one skilled in the art that the invention is not limited to the above example but may vary within the scope of the claims. For example, the heating element may have a shape other than the one described above, hot water from the hot water tank may enter the impregnation cylinder at a location other than the top of the cylinder, the attachment system also operates without preheating the water.

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Claims (5)

8 104802 A wood preservative attachment system in which the impregnating agent and the impregnating agent therein are heated by steam in a impregnating cylinder (1), characterized in that the impregnating cylinder (1) has a heating element (2) in its lower part, whereby a small amount of water the water evaporates due to the low pressure at low temperature, whereby the heated steam heats the entire volume of the impregnation cylinder (1) and the timber therein, and that a small amount of water is heated in the hot water tank (4) to about 70 degrees. Degrees Fahrenheit. The wood preservative attachment system according to claim 1, characterized in that the hot water tank (4) has sufficient water to cover the heating element (2) with water. The wood preservative fastening system according to claims 1 and 2, characterized in that the heating element (2) consists of pipes which are in the pressure class of the impregnation cylinder (1), preferably forming a loop to the lower part of the impregnation cylinder (1). *. Closure system for wood preservative according to claim 3, characterized in that the loop of the heating element (2) is U-shaped. The wood preservative attachment system according to claims 2 and 3, characterized in that the heating element (2) is heated by means of hot water, for example by utilizing district heat. 104802