JPH0617002B2 - Bark peeling prevention and dimensional stabilization method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for preventing peeling of bark of wood such as logs, and particularly of bark wood after felling, and a method of stabilizing the size of the wood.

(Prior Art) Wood with bark, such as thinned wood, has been used to make crafts.

Although the thickness of the bark and the adhesion strength of these trees are different depending on the tree species, many trees have the drawback that the bark peels off after cutting or processing, and the wood itself shrinks or twists. Have problems such as.

However, conventionally, a simple method for preventing this has not been known.

(Problems to be Solved by the Invention) The present invention is to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a simple method capable of preventing dimensional stability of bark-containing wood such as logs and peeling of bark. It is a thing.

(Means for Solving the Problems) The bark peeling prevention and dimension stabilization method of the present invention is characterized by treating a bark wood with a treatment solution containing polyethylene glycol methacrylate and alcohol.

The polyethylene glycol methacrylate used in the present invention has the following formula I: (In the formula, n represents a number of 100 or less.) It is a compound that is soluble in water and replaces water when it enters wood, like polyethylene glycol, to keep the wood in a swollen state forever. Have an effect. Then, polyethylene glycol has a drawback that it is easily dissolved from wood with water, whereas polyethylene glycol methacrylate has a drawback that it is not easily dissolved from wood but is difficult to be impregnated into wood.

In the present invention, polyethylene glycol methacrylate is usually used by itself, but a small amount of polyethylene glycol may be used together in order to facilitate penetration into wood and the like.

As the alcohol used in the present invention, lower alcohols such as methanol, ethanol and propanol can be used. Above all, methanol is preferable in terms of price, availability, and compatibility with water. These alcohols do not have to be single, and may be mixed and used depending on the wood to be treated and the purpose. The treatment solution of the present invention does not use water together. As the alcohol, anhydrous ones are preferable, but those having a purity of about the level of commercially available alcohols are usually used.

The mixing ratio of polyethylene glycol methacrylate and alcohol varies depending on the wood species to be treated, but is usually selected from the range of polyethylene glycol methacrylate: alcohol = 1 to 10:10 to 1 by volume ratio,
It is preferably 3 to 7: 7 to 3, and particularly preferably 1: 1.

In the treatment solution of the present invention, in addition to the mixture of the above polyethylene glycol methacrylate and alcohol, if necessary, an antioxidant, an ultraviolet absorber, a fungicide, a bactericide,
Colorants and the like can be included.

The treatment with the treatment solution of the present invention is usually carried out by a method of immersing the wood to be treated in the treatment solution, but when the wood is large, the treatment solution may be applied. The coating method may be a usual brush coating method or a spray coating method. The treatment should be such that at least the entire bark is penetrated by the treatment solution. If the wood to be treated is small, the treatment solution can also be vacuum- or pressure-injected in a vacuum or pressure vessel, but the process according to the invention is particularly advantageous when processing under normal pressure.

The treatment time with the treatment solution is not particularly limited, but is selected from, for example, about 1 hour to 5 days in the case of the permeation method under normal pressure. It is preferably about 3 days and nights. The same is true for other processing methods. For example, depending on the application method, wood treated with the treatment solution may be kept in a closed room for a certain period of time, or a sheet (waterproof cloth) may be used.
Alternatively, it may be wrapped in a plastic film and cured for a predetermined period.

After the wood has been treated as described above, it is usually left at room temperature for a certain period of time so as not to be exposed to direct sunlight, and the treatment for drying is completed. At this time, if the room in which the wood is placed has a special structure, it is possible to collect the alcohol that diffuses from the wood as needed.

The treatment method of the present invention can be applied to any of broad-leaved trees such as cinnamon, birch, cedar, and larch, and coniferous trees. The wood to be treated may be raw after cutting or slightly dried.

(Examples) The present invention will be described below with reference to examples.

Example 1 A mixed solution of polyethylene glycol methacrylate (trade name: Wood Foundation) and methanol at a ratio of 1: 1 (volume ratio) was used as a treatment solution, and a tree (larch log; diameter 10 cm, length) cut into this treatment solution was used. (60 cm) and larch heart-supporting timber (7 × 7 × 60 cm) were soaked for 3 days and nights. The treatment solution was occasionally agitated during the immersion to ensure complete liquid penetration.

After the completion of the dipping treatment, the treated wood was taken out of the treatment solution, left in a well-ventilated room and naturally dried to obtain the intended wood.

The larch logs treated in this manner had the same appearance as when they were growing naturally, and the bark did not peel off or curl up even after being left for a long period of time.
Further, the square bar did not cause discoloration or cracking as shown in the test example described later.

Comparative Example The same larch logs and timber as the wood used in Example 1 above were treated in the same manner as above, using a mixture of polyethylene glycol methacrylate and water at a ratio of 1: 1 (volume ratio) as the treatment solution. .

Test Example The treated wood and the untreated wood obtained in Example 1 and Comparative Example above were tested for cracking and bark peeling prevention effects.

1) Test material a: Example 1 treated log concentric square timber b: Comparative example treated log concentric square timber c: Untreated log concentric square timber Each of the above five test materials was used.

2) Test method Among the above test samples, the chemical treated larch logs of a and b were placed in a thermostatic dryer and dried at 100 ° C until a constant weight was reached, and then cracking and peeling of bark were observed.

Chemical treated squares (a and b) and untreated logs and squares were dried at 50 ° C until constant weight was reached, then observed for cracking and peeling of bark, and then dried at 100 ° C until constant weight was reached. After that, cracking and peeling of bark were observed.

3) Test results a. Example 1 Treated Material The treated log of Example 1 was not dried at 100 ° C. in a constant amount, and no cracks were observed on both mouths. Further, peeling of bark was not observed.

No cracks were observed on the wood surface and the wood surface of the treated timber after drying at 50 ℃ and 100 ℃.

Neither discoloration nor dimensional change was observed for both logs and timber.

b. Comparative Example Treated Material The treated logs of Comparative Example were not dried at 100 ° C. in constant weight, and no cracks were observed on the both mouths. However, peeling of the bark was observed at the ostium of one side.

No cracks were observed on the wood surface and the wood surface of the treated timber after drying at 50 ℃, but after drying at 100 ℃, three of the five wood surfaces or wood surface were cut. Mild cracking was observed.

For both logs and squares, no dimensional change was observed in the length direction, but a slight change was observed in the radial direction. In addition, discoloration was observed on the timber.

c. Untreated logs Untreated logs cracked on the wood surface during drying at 50 ° C. Moreover, peeling of the bark was observed at the ostium of both sides.

The square wood cracked on the wood surface and the wood surface during drying at 50 ° C.

Example 2 Using a larch log similar to that used in Example 1,
The logs were treated with methanol solutions with varying amounts of polyethylene glycol methacrylate of 20, 40, 60 and 80% by volume.

As a result, the logs obtained did not show the same cracking or peeling of bark as in Example 1, with only a slight change in the treatment time.

As described above, the larch logs that have been treated according to the present invention have the same appearance as when they were growing naturally, and the bark never peels off or curls up even after being left for a long time. It was

In addition, the logs and squares that have been subjected to the above-mentioned treatment are free from day cracking and twisting, and their dimensions do not change.

Similarly, logs such as pear, hippo, cedar, and larch were treated, and good results were obtained.

(Effects of the Invention) Since the present invention uses a mixed solution of polyethylene glycol methacrylate and alcohol as a treatment solution, it penetrates well into the tissue of wood, particularly the dense bark of the tissue, and It is thought that polyethylene glycol methacrylate can be easily replaced, the tissues such as bark are stable, and the bark does not peel off. Furthermore, by adjusting the amount and type of alcohol to an appropriate value, the release rate of water from the wood becomes appropriate, preventing sun cracking and twisting,
Effects such as dimensional stability can be obtained.

Claims (1)

[Claims] 1. A method for preventing peeling of bark and stabilizing the dimension of wood, which comprises treating wood with bark with a treatment solution consisting of polyethylene glycol methacrylate and alcohol.