JPH0558882B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. OBJECTIVES OF THE INVENTION A. Field of Industrial Application The present invention seeks to provide the production of a knotted material suitable for use as fixture materials and frame materials for fittings.

B. Conventional technology and its problems Conventionally, lumber 1 used for housing construction, etc. has been produced or commercialized as structural material, base material, finishing material, etc. according to the purpose. Therefore, materials with no defects are generally used as finishing materials such as finishing materials and frame materials for fittings, but defect-free coniferous materials are scarce as a resource and are also expensive. . Referring to Fig. 1, the defects in sawn lumber 1 mentioned here include live knots 1A', dead knots 1A'', and missing knots 1A.
etc., Node 1A, Yanitsubo 1B, etc.

Therefore, there are conventional methods to deal with the defects of wood by using "laminated wood" and "filling wood with wooden plugs," but the following problems can be pointed out.

In the case of laminated wood, the manufacturing process involves removing the defects of the wood, cutting it into small pieces, and then building it up, resulting in a poor material yield. As is well known, the process, equipment, and personnel involved are large-scale.

In the case of wood filled with wood plugs - The purpose is to turn dead knot wood into live knot wood, and it is applied only to dead knots and loose knots, and does not remove all defects.

B. Structure of the Invention A. Means for Solving the Problems The present application attempts to solve the above-mentioned problems by using a manufacturing method that includes approximately the following steps.

That is, the process of the present application is as follows.

1st step - Prepare raw green wood 2 as a base material and dried green wood 3 as hole-filling material, both of which are sawn to grains 2A and 3A, respectively.

2nd process - The raw green wood 2 that will become the base material is brought to a predetermined moisture content by watering etc., and the dried green wood 3 that will be the hole filling material is subjected to dry treatment.
The moisture content should be lower than that of

3rd process ~ Knots 2B and defects 2C of the green wood raw material 2 above
A hole 2D is opened in the part by drilling work, and a patch material 3B to be embedded in the hole 2D is made from the Aoki dried material 3.

4th process - the above hole 2D and the above patch material 3B
Apply adhesive 3C to.

Fifth step - Inserting the patch material 3B into the hole 2D with pressure and then curing it.

Drying the product that has undergone the sixth to fifth steps to a predetermined moisture content.

B. Examples of the invention The method of the present application consists of the following steps.

1st process - Aoki green lumber 2 which will be a base material and aoki dried lumber 3 which will be a hole filling material are prepared. These two pieces of blue wood 2 and 3 are made of the same material and are sawn to grains 2A and 3A, respectively.

2nd process - Aoki raw lumber 2, which will be the base material, is sprinkled with water at a watering place to adjust the moisture content to 22% or more, and the Aoki dried lumber 3, which will be the hole-filling material, is dried naturally or artificially. Adjust the moisture content to 15% or less. The reason why the moisture content of green wood raw wood 2, which is the base material, is set to 22% or more is that by wetting the green wood raw wood 2, which is the base material,
Reduces cutting resistance in hard joints.

By drying after filling the hole, the base material side shrinks and the adhesive bond with the hole filling material becomes stronger.

3rd step - Holes 2D are made by using a boring machine or the like to drill defects 2B such as knots and welts in the raw green wood 2 serving as the base material. In this case, the diameter 2D' of the hole 2D must be at least 5 mm longer than the long axis of the defect 2B, be approximately perpendicular to the grain of the plate, have a perfect cylindrical shape, and have a smooth cut side surface; The Aoki dried material 3 is used to make a patch material 3B to be embedded in the hole 2D using a patching machine or the like. This patch material 3B has a perfect cylindrical shape, slightly perpendicular to the board grain, and the cut side surface is smooth.

Fourth step - Apply adhesive 3C evenly and uniformly to the hole 2D and the side and bottom surfaces of the patch material 3B using a spreader or the like.

5th step ~ After setting the patch material 3B vertically into the hole 2D of the raw green wood that will serve as the base material, aligning the burying directions 2' and 3' of each other, the patch material 3B is placed into the hole 2D using an air press or the like. Insert with pressure. After this, it is cured in a curing room or the like at a temperature of 5°C or higher.

The materials that have gone through the sixth to fifth steps are piled up and dried by an artificial drying step or the like so that the moisture content is 15% or less to obtain the knotted processed material 4. Note that this processed material is then transferred to known processes such as wood cutting, veneer cutting, veneer bonding, and finishing.
The reason for aligning the grain directions in the fifth step is as follows.

This is to prevent poor finishing such as cracking and fluffing of the hole filling area when known processing is performed as shown in FIGS. 11 and 12 after the hole is filled.

As shown in Fig. 13, the shrinkage rate due to drying and wetness is different in the fiber direction 5A and the cutting line direction 5B of the wood 5 (for example, the shrinkage rate of Scots pine in the cutting line direction is 5.3%, and the shrinkage rate in the fiber direction is 0.1%). Filling the holes in a criss-cross manner can lead to cracks, cracks, etc. due to changes over time.

C. Effects of the invention The knotted processed material obtained by the present invention removes defective parts such as knots and potholes that are disliked by customers due to its appearance and causes cracks and misalignment due to changes over time, and can be pasted with veneer, etc. By applying this process, it can be supplied as a defect-free material, and compared to laminated wood, large-scale equipment, processes, and personnel are not required. As the material used for the knotted material, 1st or 2nd grade materials or thinned materials, which are about a quarter of the cost of defect-free materials normally used for interior parts, can be effectively used.

From the above, by processing cheap materials at a low cost, knotted materials can provide interior parts with the same quality as defect-free materials at a lower cost.

[Brief explanation of drawings]

Figure 1 is a perspective view illustrating defects in lumber,
Figure 2 is a perspective view of raw green wood sawn into grains, Figure 3
The figure is an enlarged end view of the same as the above, Fig. 4 is a perspective view of the Aoki dried lumber sawn to the grain, Fig. 5 is an enlarged end view of the same as the above, and Fig. 6 is an enlarged perspective view of the main part of the Aoki raw lumber. Fig. 7 is a perspective view explaining the drilling process, Fig. 8 is a perspective view showing the manufacturing state of the patch material, Fig. 9 is a perspective view showing the state of embedding the patch material into the hole, and Fig. 10 is the knot cutting process. A schematic vertical cross-sectional view of the processed material, Figures 11 and 12 are perspective views explaining the reason for aligning the grain directions, and Figures 13
The figure is a perspective view illustrating the difference in shrinkage rate between the fiber direction and the cutting line direction of wood. 2... Raw green wood that serves as the base material, 3... Dry processed green wood that serves as the hole filling material, 2D... Hole, 3B... Patch wood, 4... Knotted processed material.

Claims (1)

[Scope of Claims] 1. A method for producing a knotted material, characterized by comprising the following steps. 1st step - Prepare raw green wood 2 as a base material and dried green wood 3 as hole-filling material, both of which are sawn to the same grain. 2nd process - The raw green wood 2 that will become the base material is brought to a predetermined moisture content by watering etc., and the dried green wood 3 that will be the hole filling material is subjected to dry treatment.
The moisture content should be lower than that of 3rd process ~ Knots 2B and defects 2C of the green wood raw material 2 above
A hole 2D is opened in the part by drilling work, and a patch material 3B to be embedded in the hole 2D is made from the Aoki dried material 3. 4th process - the above hole 2D and the above patch material 3B
Apply adhesive 3C to. Fifth step - Inserting the patch material 3B into the hole 2D with pressure and then curing it. Drying the product that has undergone the sixth to fifth steps to a predetermined moisture content.