JPS59162009A - Corrected flat grain wood - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a straightened board material obtained by correcting the grain of sawn wood, and in particular, the present invention relates to a straightened board material obtained by correcting the grain of sawn wood, and in particular, by straightening the board material sawn along the wood grain through a predetermined process. This is a book about corrected grained materials that are formed into high-value grained materials.

In general, wood that is sawn from trees is called board-grained wood, straight-grained wood, etc. depending on the cutting position, and is used depending on the purpose of use.

In addition, the annual rings made up of the xylem layer formed during one growth period of a tree are not necessarily formed uniformly around the central axis, and vary depending on the growing conditions, but the intervals between the annual rings are small during the young period. It is wide and flexible, and the spacing between the annual rings becomes narrower as it reaches its prime, and in its old age, the rings become extremely narrow.

Furthermore, in the wood structure, there may be differences in the spacing of annual rings, such as trees that grew from spring to autumn, trees that grew from autumn to winter, or trees that face the side that receives more sunlight.
They vary in hardness, and very few grow straight, with many having curves.

Moreover, the moisture contained between the wood structures and weaves made of wood fibers, tracheids, conduits, etc., and the molecules of glue-like materials, etc., dry and dissipate into the air, causing misalignment. The wood is prone to becoming curved or deformed over time.

Therefore, as shown in Figure 1, wood grains that are sawn from trees in a direction tangential to the growth rings not only have a low commercial value by themselves, but also have differences in the density of the growth rings as they dry out. This causes deformations such as curved edges and rectangular edges, so the sawn wood cannot be used as is, and it is necessary to straighten the edges by cutting or the like after drying for a certain period of time.

The present invention has been made in view of the above-mentioned circumstances, and is made by irradiating a board with microwave or high frequency waves for a predetermined period of time using an appropriate means to heat a plank of wood that has been sawn along the grain of a tree to a constant temperature. The purpose of the present invention is to provide a straightened board material that is obtained by straightening a board material that has been sawn in a curved manner along the grain of the wood by maintaining the same state and pressing with a predetermined pressure. .

Embodiments according to the present invention will be described in detail below with reference to FIGS. 2 and 3.

FIG. 2 is an embodiment of the present invention, and is a front view showing a sawn state and a straightened state of a board with grain.

First, the wood to be treated 1 that has been sawn to a predetermined size is cut in advance in a direction tangential to the growth rings, but it is cut along the wood grain so that the grain pattern 2 is located in the center of the wood 1. It is sawn with a certain degree of curvature.

As shown in FIG. 3, the wood 1 to be treated is installed in a straightening device consisting of a microwave or high frequency generator 3, both electrode plates 4.5, a pressurizing device 6 such as a press, etc., and subjected to a predetermined straightening process. will be applied.

That is, the wood 1 to be treated is heated by being irradiated with microwave or high frequency output from the high frequency generator 3 that is suitable for the length, thickness, etc. of the wood 1 for a certain period of time. The wood grain pattern 2 of the wood 1 is corrected to a straight state by being subjected to shiveless processing by the pressing force.

Thereafter, the press working state is left to cool to form a straightening board material.

Here, the output and heating time of the high-frequency generator 3 and the pressure applied by press processing vary depending on the cross-sectional area and length of the cutting opening of the wood 1 to be treated, and the material of the wood, and are not appropriate. set in the condition.

In addition, in the cooling step after press working, initially the press work is allowed to cool in the 1-1 state, but after a predetermined period of time, the press machine may be left to cool with the press machine removed.

As a result, molecules such as glue-like substances contained in the wood structure are heated internally, causing them to become soft, move, and cause misalignment.
The adhesive water in the conduit is appropriately discharged, and the curved grain pattern 2 of the lumber is straightened by press processing. The material components are solidified to form a straightening board material.

In addition, in the process according to the present invention, if the microwave or high frequency is irradiated for a long time by the high frequency generator 3, destruction of the wood structure may occur, and the wood may become too hard to be corrected. Therefore, when entering the pressing process in a heated state by microwave or high frequency irradiation,
Regardless of the size of the wood 1 to be treated, it is desirable to stop applying pressure when the curved shape is straightened, stop irradiation with microwave or high frequency after a predetermined period of time, and leave it to cool until it reaches normal temperature. .

Next, experimental examples conducted based on the process according to the present invention will be explained. First, a cedar tree was sawn along the grain of the annual rings, and a square lumber to be treated with a length of tsm and a 15m x 15 cutout was prepared.

The moisture content of the square timber to be treated was 35%, and after irradiating it for 12 minutes with the output of the high frequency generator 3 at 12KW,
It was confirmed that the grain pattern was corrected by pressurizing the ton press machine for 915 minutes, so the output of the high frequency generator 3 was stopped and the straightened grain material was left to cool for 19 hours. Ta.

The straightened board material obtained by the above-mentioned process has little hygroscopicity, so it does not distort, has improved durability, and has a remarkable decorative effect.

As explained in detail above, the straightened board material according to the present invention is a material that can obtain wood with the same appearance as natural wood by pre-milling wood along the grain of the wood through a predetermined process, and can be used to produce thick boards or Not only can it be applied to building materials such as pillars, but even rough wood products with low value as board material can be straightened into high-quality board materials, so the decorative and visual effects are remarkable, and it can be used for furniture, etc. It can also be used as a high-grade external surface material, increasing its commercial value.

In addition, the straightened board material processed according to the present invention has low hygroscopicity and does not deteriorate over time, so it has sufficient strength even when used in locations where durability is required.

[Brief explanation of drawings]

FIG. 1 is an explanatory view showing the state of sawn conventional board material and the state of change over time. FIG. 3 is a schematic explanatory diagram showing a correction device according to the present invention. DESCRIPTION OF SYMBOLS 1... Wood to be treated, 2... Grain pattern, 3... High frequency generator, 4.5... Electrode plate, 6... Pressure device.

Claims (1)

[Claims] The treated wood is cut tangentially to the annual rings of the tree and sawn so that the grain pattern is located in the center of the wood.
Heat the wood by irradiating it with microwave or high frequency waves for a period of time that matches the conditions of the wood using a predetermined method, and then pressurize the wood with a predetermined pressure while it is still heated, and then bring it to normal temperature. Straightened grain material is characterized by straightening the grain pattern of the wood by cooling it until it cools.