KR20080102629A - Accelerating preservative treatment methods for rounded raw wood by compression process - Google Patents

Abstract

A compacting antisepsis-processing method of the timber is provided to promote the injection of the antiseptic by improving ventilation function of the timber. A compacting antisepsis-processing method of timber comprises: a step for compressing circumference of the timber in the radius inner side direction; a step for infiltrating antiseptic into the compacted timber; a step for drying the compacted timber; a step for infiltrating antiseptic in the dried timber.

Description

Accelerating preservative treatment methods for rounded raw wood by compression process

1 is a schematic diagram of a compression processing machine for the compression processing preservation method of raw wood of the present invention.

Figure 2 is a real picture of the compression machine of FIG.

3 is a photograph taken from the lower side of the compression processor of FIG.

Figure 4 is a graph of the water reduction relationship by compression processing.

5 is a relation graph of moisture content change by compression processing.

6 is a graph showing a relationship between water content and water absorption according to the amount of compression.

7 is a graph of the relationship between the degree of infiltration according to the water content and the amount of compression.

8 is a relationship graph of bending strength change according to compression rate.

9 is a micrograph of wood tissue after compression processing.

In order to facilitate the injection of the chemical solution of the preservative evenly to the inside of the hard injection species or the core part difficult to inject the wood preservatives in the main wood, the high-yield raw materials in the half arc state roller connected to the axis from the outside of the main wood By applying pressure evenly to the entire area, the structure of the wood is momentarily destroyed by the physical force, which is a shrinkage deformation caused by the contraction of the cross section of the wood temporarily, and then restored to its original state, thereby improving the transmission function of the wood tissue. A method of promoting the injection of preservatives. More specifically, the physical force compresses the main wood through a cylindrical roller that is narrower than the original, and temporarily deforms the membrane holes and cell walls, which are the passages of water movement of the raw wood, but the wood tissue is destroyed because of the raw wood. It temporarily distorts and restores to normal. In this process, the water movement in the wood becomes much easier than before treatment, and the absorption and infiltration of the preservative are improved, and the injection of the chemical liquid is more even than the conventional method. Also, the strength of wood does not decrease, the drying speed is increased, and the warping and cracking of wood are much eliminated.

In most wood, preservative injection is easy to inject the sap solution which used to act as a conduit of water, but the core part that loses water function and supports tree is not as well as injecting sap solution. Do not.

If the preservatives are not injected deeply into the wood, the wood will rot due to rainwater penetration if the depth of the crack is deeper than where the preservative has penetrated when the wood is cracked or warped.

In order to suppress the occurrence of such internal bleeding, the preservative must penetrate deeper than the depth of cracking. However, since the main wood contains a core inside, warping and cracking are much more severe than plates or lumber, and the depth of surface heat generation occurs very deeply. In order to solve this problem, measures such as crack prevention ships (distribution) are randomly directed toward the tree.

In particular, in the case of raw materials there is a large amount of moisture in the wood, because of the moisture remaining inside even after pressure preservation treatment, it is difficult for the preservative to penetrate into the wood.

In order to eliminate these defects, wood is generally preserved after drying the wood with a water content of less than 28% (fiber saturation point). However, if the micropores present in the intracellular lumen and wall sclera, which plays an important role in the movement of moisture in the drying process is narrowed or blocked, the injection of the chemical solution is disturbed.

In case of hardwood, it is difficult to inject preservatives. In order to promote the injection of preservatives, the surface of wood is scratched by a sizing blade equipped with a sharp blade on a flat drum-shaped plate. Although it uses a aging method to forcibly inject preservatives to the inside of the wood, in the case of columnar wood, it has a rounded surface, which makes it difficult for the blade to penetrate into the wood with a certain depth and also breaks the blade easily. It is difficult to inject the chemical solution because the treatment is actually difficult. Until now, the method of aging of cylindrical wood has been developed in the form of needle-shaped sizing machine with a needle attached to the inside of a cylindrical tube, but the equipment itself is very expensive and the needle is easily broken.

An object of the present invention devised to solve the above problems, the raw material in a high water content state to facilitate the injection of the preservatives evenly to the inside of the hard-injected species or core parts difficult to inject wood preservatives in the main wood Half-way rollers connected by shafts apply pressure to the entire surface evenly from the outside of the main wood, and temporarily destroy the tissue inside the wood by physical force, which is a shrinkage deformation caused by the temporary shrinkage of the cross-sectional area of the wood. The present invention relates to a method of promoting the injection of preservatives by improving the permeability of wood tissue through the process of preservation. More specifically, the physical force compresses the main wood through a cylindrical roller that is narrower than the original, and temporarily deforms the membrane holes and cell walls, which are the passages of water movement of the raw wood, but the wood tissue is destroyed because of the raw wood. It temporarily distorts and restores to normal. In this process, the water movement in the wood becomes much easier than before treatment, and the absorption and infiltration of the preservative are improved, and the injection of the chemical liquid is more even than the conventional method. It is also possible to provide a treatment method in which the strength of the wood does not decrease, the drying speed is increased, and the warping or cracking of the wood is much eliminated.

The present invention for achieving the above object, the step of compressing the outer peripheral surface of the raw raw wood toward the radially inward direction; And a preservative treatment method of raw raw wood, comprising the step of infiltrating preservatives into the compressed raw wood.

Another invention, the step of compressing the outer peripheral surface of the raw cylindrical wood toward the radially inward direction; Drying the compressed raw wood; And a preservative treatment method of raw raw wood, comprising the step of infiltrating the preservatives into the dried raw wood.

The compression processing is characterized in that made by a compression roller having a passage hole smaller than the diameter of the raw wood.

In addition, the preservative is characterized in that the water-soluble wood preservative.

In addition, the water-soluble wood preservative is characterized in that the copper azole compound wood preservative, copper alkyl ammonium compound-based wood preservative.

In addition, the compressibility of raw raw wood is characterized in that less than 30%.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described. In adding reference numerals to components of the following drawings, it is determined that the same components have the same reference numerals as much as possible even if displayed on different drawings, and it is determined that they may unnecessarily obscure the subject matter of the present invention. Detailed descriptions of well-known functions and configurations will be omitted.

When compressing raw raw wood with rollers with round holes smaller than the diameter of raw raw wood, the wood shrinks and deforms due to pressure and damages the intraluminal lumen, wall membrane, and cell wall, which become water passages. As a result, the moisture in the wood escapes to the outside.

At this time, since the main tree is a living state with a very high moisture content, it is a deformation caused by crushing rather than a breakage of the intraluminal lumen, wall sclera, or cell wall, and as time passes, the tree is restored by the elastic force of the wood itself and the cells return to normal. To recover.

Therefore, the strength reduction of the wood hardly occurs.

In addition, when the wood is deformed, the internal moisture is discharged, and part of the cell lumen, wall sclera, or cell rice is temporarily destroyed, so that drying time can be reduced when dried before preservative injection.

However, in the state in which the raw wood is compressed, the migration of the preservative during the preservative treatment is also improved because the movement of moisture in the wood is much easier than before treatment due to the deformation of the intraluminal lumen, the sclera or the cell wall as described above.

As a preservative, wood preservatives such as copper azole compound-based wood preservatives (CUAZ-2) and copper alkyl ammonium compound-based wood preservatives (ACQ) may be used, and are characterized by being injected with water-soluble wood preservatives.

In general, when the injection of preservatives from the main wood is more than 60% of the total wood cross-sectional area, even if the internal weathering proceeds, the remaining 60% of the non-corrosive parts maintain the strength. It gives more stress than other materials, so there is no need to worry about decrease in strength.

In particular, the compression ratio of the columnar wood is preferably 30% or less. This is because when the compression ratio exceeds 30%, the main tree tissue is destroyed and the strength of the main tree decreases.

EXAMPLE

As raw materials of raw materials, raw wood logs (Φ9 × 270cm) containing core materials were used. The test materials were vinyl wrapped immediately after circumferential processing, and the moisture content of the test materials measured immediately before compression was about 136%.

A sample of 30 cm inside from one end was taken and used for the measurement of moisture content before treatment, and a sample of 30 cm inside after the treatment was used for measurement of absorption and infiltration.

The preservative used was a copper azole compound (CUAZ-2) preservative which is a water-soluble wood preservative.

As a compression treatment, as shown in FIGS. 1 to 3, a compression processing machine including a plurality of rollers having a through hole smaller than the diameter of the specimen was used.

However, in consideration of the compressive strain of the specimen, when the specimen proceeds from left to right, as shown in FIG. 1, the diameter of the through hole of the roller on the left side was larger than the diameter of the through hole of the roller on the right side.

In order to investigate the treatment effect according to the moisture content of treated wood, it is divided into raw materials immediately after circumferential processing (water content of about 60 ~ 120%), condition after processing (about 30 ~ 50%) and total condition after processing (about 18 ~ 25%). 10%, 20%, and 30% compression ratios were applied to the treated wood, respectively. The shrinkage width and applied pressure of wood according to each compression rate are as follows.

Compression Ratio (% Volume) Shrink Length (mm) Max pressure (㎏ / ㎡) One 10 2.5 12.5 2 20 4.8 17.0 3 30 7.4 19.5

Preservative work solution was pressure preservative treatment (cell cell method, maximum pressure 15kg / cm3) to a concentration of 2% (w / v), and was cured at room temperature for 3 weeks or more.

The absorption was measured using inorganic fluorescence spectrometers (XRF, XEPOS), and the degree of infiltration was measured after spraying a coloring reagent on the cross section cut within 30 cm of the cross section of the specimen using a copper indicator, Chrome Azurol-S.

The flexural strength was measured using a universal strength tester (UTM, instron 5585), and the change in flexural strength was measured according to the compressibility of each treated material controlled by moisture content of 11.4% (standard deviation 2.9).

In the centralized load method, the specimen length was 180 cm, the maximum load of the load cell was 20 tons, and the crosshead moving speed was 5 mm / min.

The test results as above are as follows.

As shown in Fig. 4, the moisture reduction (creation state) by the compression process is in the order of 30% compression (445g)> 20% compression (298g)> 10% (191g), and the moisture content change is shown in FIG. As such, it is 138% untreated and 128% (10% compression) ⇒ 119% (20% compression) ⇒ 73% (30% compression).

Looking at the change in absorption amount by the compression treatment, as shown in Figure 6, even after 30% compression immediately after the compression treatment, the absorption amount showed a value of about 1kg / ㎥, the compression rate at about 40% moisture content in the air condition after the compression treatment Irrespective of this, the amount of absorption reached 3.5 kg / m 3.

In addition, the absorption rate of 30% showed a value of 5.0 kg / m 3, and after compression processing, the absorption rate was adjusted to about 22% after being put into a drying furnace.

The change of the infiltration degree by the compression process is shown in FIG.

That is, in the living state, the drug infiltration degree was low even if the compression treatment was applied, and even the penetration of the chemical solution was not achieved even in the sapwood part.

However, drying only up to about 40% after compression processing according to the present invention showed a similar degree of infiltration to the wood in the untreated pre-drying state.

In particular, in the case of the treated material exposed to the outer core portion, the core infiltration degree was greatly improved.

In addition, the overall increase in the compressibility slightly improved the degree of infiltration, but the difference was small.

The change in flexural strength due to the compression process is shown in FIG. 8.

First of all, when 30% of compression rate is applied, the strength decrease is less than 6%, and the compressive strength after compressive processing, preservative treatment and drying according to the specified compression rate in raw materials is measured, and the maximum allowable strength of compressed material is about 606 ~ 623kgf / ㎠ showed a value equal to or slightly lower than 623kgf / cm2 of untreated group, but no significant difference (Duncan, α = 0.05) was found between each compressibility and untreated group strength.

Figure 9 is a result observed with an electron microscope to see the change of the wood texture by the compression treatment.

In other words, the shape of the field wall hole, the flexible wall hole, and the resin sphere on the cross section of the radial cross section by the compression treatment were not found to be different from those of normal cells by electron microscopy.

As described above, it has been described with reference to the preferred embodiment of the present invention, but those skilled in the art various modifications and changes of the present invention without departing from the spirit and scope of the present invention described in the claims below I can understand that you can.

Through the present invention, when processing raw raw wood is easy to remove moisture, and because it is possible to inject the chemical solution into the space generated due to the removal of water, the chemical liquid penetrates deeply into the core part which was difficult to inject the usual medicine. In addition, since the movement path of moisture is formed inside the main tree, the warp of the inside and outside of the main tree becomes smooth, so that the warpage of the wood is much reduced, and there is almost no heat split. Therefore, it is possible to prevent splitting without the crack prevention line, which has been provided with the crack prevention line in the column.

In addition, even during drying, the moisture is discharged due to compression processing, the time required for drying is considerably reduced.

In addition, due to the deformation of the intraluminal lumen, the scleral membrane or the cell wall, the movement of water in the wood is much easier than before treatment, so that the absorption and infiltration of the preservatives are improved, so that the injection of the chemical liquid is more uniform than the conventional method, and the injection into the core material is also possible.

And, despite the above advantages, no decrease in strength occurs.

In addition, since there is little distortion due to the water removal, the conventional drainage (crack prevention line) is not necessary.

Claims (6)

Compressing the outer circumferential surface of the raw cylindrical wood toward the radially inward direction; And Compressive preservative processing method of raw raw wood comprising the step of infiltrating the preservatives into the compressed raw wood. Compressing the outer circumferential surface of the raw cylindrical wood toward the radially inward direction; Drying the compressed raw wood; And Compressive preservation treatment method of raw raw wood comprising the step of infiltrating the preservatives into the dried raw raw wood. The method of claim 1 or 2, wherein the compression processing is performed by a compression roller having a passage hole smaller than the diameter of the raw raw wood. The method of claim 1 or 2, wherein the preservative is a water-soluble wood preservative. The method of claim 4, wherein the water-soluble wood preservative is a copper azole compound wood preservative and a copper alkyl ammonium wood preservative. The compressive processing preservation treatment method of raw raw wood according to claim 1 or 2, wherein the raw wood has a compression ratio of 30% or less.

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