KR19990076498A - Compression processing to harden the hardness and strength of wood - Google Patents

Abstract

A device for increasing the hardness and intensity of wood which comprises chuck means for holding the wood in a fixed position for processing, a compression-shaped forming die for compressing the wood being processed, an ultrasonic wave-generating device operatively connected with the compression-shaped forming die for applying sound waves to the wood, a forming mold positioned downstream of said compression-shaped forming die for receiving wood therefrom, said forming mold further compressing said wood to remove a portion of the water contained therein, and means for advancing the chuck means containing the wood being processed through the compression-shaped forming die, the ultrasonic wave-generating device and the forming mold.

Description

Compression processing to harden the hardness and strength of wood

The present invention is to provide a new method to improve the quality of the wood products in processing while making the wood hardened by post-processing the harvested logs.

In general, in processing wood felled in the natural state to remove the moisture contained in the wood as much as possible to reduce the moisture content only to remove the elements of deformation, such as cracks, torsion of processed wood products.

However, the conventional wood processing method had to reduce the moisture content rate of the felled wood by various means such as natural drying, artificial drying, these methods are a cause of increasing the production cost of wood products because it takes a long time to dry.

The present invention balances the moisture in the wood through a special post-processing process without going through the conventional process of drying the harvested wood for a long time and causes regular shrinkage without destroying the wood fiber tissue. In order to improve the post-processability of wood and to improve the irrational problems such as waste of wood resources or defects of products due to wood deformation, all at once.

As timber is in the process of growth at the time of logging, the fiber contains the maximum amount of water, and the water-containing fiber is placed in a continuous distribution of a kind of fine water storage chamber.

Therefore, when the moisture is dried as much as possible, the fine moisture storage chamber inside the wood causes a phenomenon of cavitation, and thus, the fiber density becomes low, so that the wood becomes hard.

Such a material property may be accompanied by a weakness of the firmness and durability of the product when completing the wood product, so a low water content and high density of the wood is a desirable phenomenon.

In view of the above necessity, the present invention forcibly pushes the chopped wood into a small diameter compression molding machine to reduce the volume while forcibly extracting the water contained in the fiber, and at the same time, to reduce the pore structure of the fiber tissue occupied by the water. By reducing the volume, the density of the fibrous structure is increased to increase the firmness of the wood, and the shortcomings of deformation such as cracking and warping, which occur in the wood due to water evaporation after processing the product, are eliminated.

1 is a cross-sectional view showing an embodiment of the configuration device of the present invention

2 is a longitudinal cross-sectional view of FIG.

3 is a perspective view of FIG. 2

4 is an enlarged view of main parts

※ Explanation of code about main part of drawing ※

1: gas 2: compression mold

3: molding die 4: piston

5: Piston tip 6: CHUCK

7: Washer 8: Bolt

9: JAW 10: wood

11: cam 12: cam request

13: Cam Guide 14: Juicer

15: Ultrasonic Generator 16: Ultrasonic Concentrator

V: Unidirectional Acoustic Vibration V ₁ , V ₂ , V ₃ : Stereo Acoustic Vibration

A-A: Vertical Shaft A'-A ': Eccentricity

O-O ＇: Horizontal shaft center

1 is a cross-sectional view showing an embodiment of the constituent device of the present invention.

The upper part of the molding machine gas 1 is installed obliquely to maintain a constant inclination θ of the cylinder-shaped compression molding frame 2, such as a steel pipe body with a high pressure strength, and a plurality of through-holes 2a so that the fluid flows down the main surface of the compression molding frame 2 Perforate the bottom and install the juice tray 14 to collect the sap at the bottom.

A cylindrical compression molding die 3 (hereinafter referred to as a molding die) is installed at the front of the compression mold 2, and an ultrasonic generator 15 is installed on the upper part of the molding die 3, and an ultrasonic concentrator 16 is disposed on the lower side of the ultrasonic generator 15. Install so that it is slightly eccentric to one side with respect to 10 axial direction.

At the inlet side of the forming die 3, a wood 10 for processing is disposed, and a hydraulic piston 4 is installed at the rear of the forming die 3 in accordance with the axial direction 0 'of the compression mold 2 and the forming die 3 to hold the wood in front. The chuck 6 is assembled with the washer 7 and the bolt 8 so that the chuck 6 can be held by the jaw 9 teeth while the chuck 6 rotates in both directions.

On one side of the chuck 6, a cam guide 13 fixed to the lateral direction of the wood 10 is installed, and a cam demand 12 is provided inside the cam guide 13 so that the cam 11 protruding on both sides of the chuck 6 is slid to the cam demand 12. When wood 10 is pushed into molding die 3, it is designed to force itself into compression molding frame 2 while making left and right swing, that is, twist movement.

Using the above configuration of the present invention will be described a specific method of hardening the fiber structure of the log.

The wood used in the present invention is intended for all wood in the undried state as well as immediately after logging.

Therefore, it is the useless log type, and all trees that have not undergone long-term drying and curing processes such as pine, willow, and aspen.

The present invention is to place the wood 10 to be processed so that the front end of the wood 10 in the inlet pipe of the compression molding machine, that is, the molding die 3, and hold the wood 10 end with the jaws 9 of the chuck 6 to the piston 4 in the axial direction of the compression molding frame 2 Push in with a positive pressure. As the piston 4 proceeds, the cam 11 installed on the side of the chuck 6 is guided to the cam demand 12 of the cam guide 13, so that the wood 10 alternately rotates clockwise and counterclockwise, i.

At the same time, the acoustic vibration generated from the ultrasonic generator 15 is applied to the wood 10 in three dimensions through the ultrasonic concentrator 16.

At this time, the unidirectional acoustic vibration V generated by the ultrasonic generator 15 is eccentrically connected to the ultrasonic concentrator 16 and the molding die 3 of the anisotropic material without being connected to the same axis, so the vibration force thereof is the three-dimensional acoustic vibration V ₁ , V ₂ , V _3. V ₁ (vibration force) is branched and transmitted in the axial direction of the forming die 3, V ₂ in the direction perpendicular to the axis of the forming die 3, and V ₃ in the tangential direction of the forming die 3.

The stereoacoustic vibrations V _1, V _{2, and} V ₃ transmitted to the molding die 3 are characterized in that the acoustic wavelength transmitted in the vertical direction of the axis of the molding die 3 is longer than the cross-sectional dimension of the molding die 3.

In the wood 10 of the forming die 3, the positive pressure of the piston 4 and the three-dimensional acoustic vibrations V ₁ , V ₂ , and V ₃ clamp the wood in the axial direction of the forming die 3 by the constituent device. Compressed in the same way as to enter the compression mold 2, the wood 10 is processed to obtain the same strength and hardness. As described above, the axial static pressure is the ultrasonic generator 15, the ultrasonic concentrator 16, the molding die 3, and the three-dimensional acoustic vibrations V _1, V _{2, and} V _{3 transmitted} to the wood 10. Direction, the fiber density and strength are densely changed while the wood tissue is not destroyed.

Accordingly, the positive pressure and the stereoacoustic vibration wavelength condense narrowly the capillary and pore spaces that were the water storage chambers of wood 10 while forcibly extracting the water in the wood 10 cells, that is, juice, to make the fibrous tissue hard without changing the wood structure. do.

If the long wood 10 is compressed without alternating rotation and acoustic vibration, the wood 10 is difficult to transfer due to friction with the inner wall of the compression mold 2, and the high pressure is applied in the axial direction of the molding die 3. At this time, the structure of the wood 10 may be destroyed and stress may be generated in the wood structure, which may cause deformation of the wood.

However, the present invention is compression molding while transporting a long length of wood 10 to give a three-dimensional acoustic wave vibration so that the acoustic vibration is transmitted to all the wood 10 portion of the compression molding frame 2 is essentially less frictional force and also the wood 10 is transported in a straight line Since the alternating power is automatically generated by the cam demand 12 formed in the cam guide 13, the acoustic vibration force, the static pressure and the alternating rotation force are combined with each other, so that the friction coefficient of the inner wall of the compression molding frame 2 is slipped and slipped, so the compression molding is performed at a small pressure. It is easy to maintain and equally dense over the entire volume without damaging the wood 10. In other words, due to the rotational vibration, the stress on the wood part alternately shakes the wood 10, and the water is easily taken out. Therefore, the wood is processed without changing the structure of the wood and the density of the tissue is maintained evenly. You can do it.

And the radiating surface of the ultrasonic concentrator 16 is installed at the inlet of the molding die 3 into which the wood 10 enters, thereby concentrating the acoustic energy at the inlet of the molding die 3 at the highest level to maintain the condition in which the acoustic wave is transmitted economically and obtain the best processing efficiency. To be able.

The present invention applies alternating power by the cam 11 and the cam guide 13 device while applying the positive pressure of the piston 4 to the wood 10 in the forming die 3 in the axial direction of the forming die 3 as described above. The acoustic vibrations V are collected from the ultrasonic concentrator 16 and the three-dimensional acoustic wave vibrations V ₁ , V ₂ and V ₃ are transmitted to the wood 10 through the molding die 3 so that the wood has the same shape as the molding die 3 (compression molding frame: 2). As it is compressed, it is conveyed into the compression mold 2 and is subjected to compression processing. The wood product using this can be a high-quality wood material having good hardness and strength without destroying its structure and structure.

In the process of the present invention, since the moisture contained in the wood, that is, the juice component is produced in a large amount through the through-hole 2a of the compression molding frame 2 during the processing, the juice can be recycled as a nutritional health beverage by separately collecting and processing the juice.

Therefore, the present invention wood compression molding can be used in conjunction with the natural juice production apparatus can obtain the secondary economic benefits of health beverage production.

Example 1

Put the semi-finished aspen tree into 61m / m length 500m / m 0.42g / cm3 into the inlet cone of the 54m / m diameter molding machine and transfer the acoustic wavelength to the ultrasonic concentrator16 while applying a constant pressure of 4,900kg to 6m / Pressurized at m / 1.Se rate.

At the same time, the semi-finished product was rotated alternately as described above. The initial rotation angle was 0.2 ° when the 0.9 Gradso semifinished product entered the molding machine.

The alternating rotation speed was set to 0.12 / Sec = 360 ÷ 12/1 second.

After compression processing, the product was dried in the molding machine and drawn out. As a result, the wood product density was 1.5 times, diameter changed to 53m / m, wear resistance doubled, and strength increased 1.8 times.

X-ray images confirmed that the cross-sectional fibers were evenly compressed.

The difference in density from the outer skin to the center was 8 to 10%, and the results were judged to be good for long products.

In order to increase the product density to 1.5 times, the static pressure was set at 7,000kg and the piston speed was set at 3mm / Se.

This proves that giving wood the acoustic wavelength and alternating motion is a very effective component of compression processing.

The basic principle that the acoustic vibration imparting method in the process of forcibly compressing wood 10 promotes the contraction effect of wood 10 is that it is the effect of densifying the tissue by promoting the molecular movement of wood fiber itself. In other words, when vibration is applied to the molecular tissue of wood by the regular acoustic wavelength, the molecules of the wood tissue are activated, and in this state, when the positive pressure and the alternating power by the piston 4 are applied to the compression mold 2, the wood fiber tissue Among the most fragile water-containing capillaries, that is, pores easily contracted and forced to withdraw moisture, and instead the condensed pores of the capillary tissue were condensed to reduce the volume, thereby making it easier to densify wood 10.

In the present invention, in particular, acoustic vibration is transmitted in a eccentric state by using molded dice 3 made of anisotropic material in an eccentric state without transmitting ultrasonic vibration to the central part of wood 10, thereby dynamically transmitting acoustic vibration to the fiber tissue. The advantage is that the shrinkage density is induced uniformly.

Since the present invention can immediately process the natural wood 10 gathered, it does not require long-term drying and curing time of the wood as in the prior art, it can give a reasonable economic efficiency to the production of wood products, in particular by the present invention The processed wood products have the advantage that post-defects such as cracking and warping deformation do not occur, and also the durability and impact reduction of the product are remarkably improved, and thus various construction materials and furnitures and their use fields are very diverse. .

Claims (1)

In the compression processing of the fibrous structure by forcing the log from the cylindrical molding die 3 of the compression molding frame 2, which has been standardized, An ultrasonic concentrator 16 connected to the ultrasonic generator 15 above the forming die 3 made of anisotropic material is installed in an eccentric state A'-A 'within a certain range from the vertical axis center AA so as to balance the ultrasonic vibration to the wood tissue. A cam guide 13 having a cam demand 12 is provided on the supply side piston 4 side of the wood 10 so that the cam 11 of the wood fixing chuck 6 is oscillated by the cam guide 13 to compress the work while giving alternating movement to the wood 10. Compression processing method to harden wood hardness and strength of logs.