JP6767530B2 - Manufacturing method of mixed composite material by high frequency - Google Patents

Description

The present invention belongs to the field of wood board processing technology, and particularly relates to a method for producing a mixed composite material by high frequency .

In recent years, research and application to composite materials has received a great deal of attention, and composite materials have various excellent performances, do not require secondary processing, are easy to install, however, conventional composite materials are formaldehyde, Organic materials that are harmful to the human body, such as xylene, are often used, which is harmful to human health and cannot meet people's needs. In addition, composite materials made from various types of wooden boards have problems such as cracking. , High defect rate and increase production cost.

In order to solve the above technical problems, the present invention provides a method for producing a mixed composite material by high frequency .

Specific technical solutions of the present invention are as follows.

In the high-frequency mixed composite material according to the present invention, at least two wooden boards having a density of 0.7 kg / m ³ or less are produced by high-frequency heating, a degenerate connection layer is formed between adjacent wooden boards, and the compression strength of the grain is 100. It has a bending strength of −120 MPa and a bending strength of 200-230 MPa, and is mainly produced by the following a−f steps.

a. Pretreatment: The wood board is treated to have a moisture content of 8% -18% and a thickness of 10 cm or less to prepare a pretreated wood board.

b. Laminating treatment: Two or more pretreated wood boards are stacked and arranged in at least one load direction to prepare a laminated wood board, and the load direction includes a direct pressure direction and an indirect pressure direction.

c. Heat and pressurization treatment: The degenerate connection layer of the laminated wood board is heated to a wood board temperature of 80 to 100 ° C., kept warm for 4 to 6 minutes, and pressure treatment is performed according to a preset compression rate according to the receiving direction.

d. Hardening treatment: The wood board that has been heat-pressurized is heated at a high frequency to a wood board temperature of 180-220 ° C., kept warm for 5 to 8 minutes, and hardened to prepare a hardened wood board.

e. Temperature lowering treatment: The plate surface after curing treatment by water cooling technology is cooled to a plate temperature of 70-85 ° C at a rate of 5-15 ° C / min, and the water flow rate of water cooling technology is 0.9-1.5 m / s. The board surface temperature is cooled to 88-90 ° C and the air is cooled at the same time. The wind speed is 9.2-9.7 m / s and the air temperature is 55-60 ° C. The angle between the wind direction and the upper and lower surfaces of the wooden board. However , the angle between the wind direction and the upper and lower surfaces of the wooden board is preferably 55-58 °.

f. Curing treatment: The temperature-decreased wooden board is left at room temperature for 15 to 20 days to obtain a mixed composite material by high frequency .

Here, the purpose is to wrap the pretreated wood board with tin paper or plastic before the laminating treatment to reduce the degree to which the water content of the pretreated wood board changes depending on the surrounding environment, and the load direction is the laminating of the wood board in the pressure direction. It is divided into a direct load direction, which is the same as the direction, and an indirect pressure direction , where the pressure direction is perpendicular to the stacking direction of the wooden boards. It can be achieved by extending the length of the conveyor when cooling to lower temperatures as needed in actual production. Further, it is necessary to place a metal plate at 180-220 ° C. on the upper and lower surfaces of the wood during cooling, and the area ratio of the metal plate to the wood is preferably 1.4-1.6: 1. The water cooling technique is to cool a metal plate with water, and the temperature of water is preferably 16-17 ° C. The high-frequency heating used for the heat compression treatment and the hardening treatment in the present invention may be carried out in the same equipment or in different equipment. The upper and lower surfaces of the wood may be heated with a metal plate during heating, the amount of water used is guaranteed so that the temperature of the cooled water during cooling is 35 ° C, and the temperature of the cooled water is 35 ° C. If it exceeds, the cooling effect is low and the surface temperature of the metal plate is high. Therefore, when pouring a large amount of water into the metal plate, the temperature of the metal plate is lowered by steam, and the wood is cooled at a constant velocity to enhance the cooling effect. As a matter of course, the metal plate during cooling and the metal plate during high-frequency heating may be the same or different metal plates. The composite material produced by the above method in the present invention can increase the density, specific gravity, grain compression strength and bending strength of the wood board, and has high strength, excellent waterproofness, no deformation, and during use. It may be cut directly, and the effect of the painted surface can be achieved without painting.

Further improved, the retracted connecting layer formed between two adjacent wood boards in the composite is a mortise and tenon for tightening. In step b laminating, two or more pre-treated wood boards. The densities of the adjacent first pre-treated wood board and the second pre-treated wood board, which are arranged so as to be stacked in the indirect pressure direction to produce a laminated wood board, are ρa and ρa or more, respectively, and the first pretreatment At the edge in the texture direction where the wood board and the second pretreated wood board are adjacent to each other, a mortise with a gap between the mortise and the tip is provided, and at least one rough surface having a roughness Ra is provided on the mortise. Ra = w / ρa, w> 0, w is a coefficient larger than 0, and the unit of roughness Ra is μm.

Further improved, in the composite material, the degenerate connection layer formed between two adjacent wooden boards is a thermoplastic resin thin film between the two uneven surfaces and the two uneven surfaces. One or two or more pretreated wooden boards are directly stacked and arranged in the load direction to prepare a laminated wooden board, and a thermoplastic resin thin film is installed between two adjacent pretreated wooden boards.

Further improved, the thermoplastic resin thin film has a thickness of 0.5-0.9 mm and a viscosity of 15.6-16.4 Pa. It is a PVB interlayer film having s and elasticity of 8-9 × 10 ⁶ Pa · s, and the area ratio of the contact surface between the wooden board and the PVB intermediate film is 100: 1-100: 100.

Here, as the PVB film, any TVB film that can realize the effect of the technique may be adopted. In the present invention, by specifically limiting the thermoplastic resin film to the PVB intermediate film, each performance index of the composite material can be further enhanced.

Further improved, the degenerate connection layer formed between two adjacent wooden boards in the composite is two engaged concave-convex surfaces, and the non-peak and non-dip portions of the two concave-convex surfaces are thermally heated. There is a plastic resin thin film, see FIG.

Further improved, the preset compressibility P in step c is preset by the following method so that the density after compression is higher than the density of any wood board before compression.

By limiting the relationship between the compressibility and the density, the present invention can avoid problems such as poor performance of each composite material due to insufficient compressibility or cracking of the composite material due to overcompression.

Further improved, the step d curing treatment is heating by high frequency, the number of high frequency electrode arrangements is N, and the pretreated wood board is evenly distributed over N parts along the direction in which the electrode arrangements are arranged side by side. Separately, the average moisture content Q of each part is measured, the temperature of the plate when high frequency heating is performed in the curing process is T, the heating time is t, and Q, T, and t satisfy the following conditions.

When 8% ≤ Q ≤ 10%, 180 ° C ≤ T ≤ 185 ° C, 1 min ≤ t <2 min.
When 10% <Q ≦ 12%, 185 ° C <T ≦ 190 ° C, 2 min ≦ t <4 min, and when 12% <Q ≦ 14%, 190 ° C <T ≦ 200 ° C, 4 min ≦ t <5 min, 14% When <Q≤18%, 200 ° C. <T≤210 ° C., 5min≤t≤6min

In the present invention, the wooden board is divided into a plurality of parts, and the temperature and heating time of the high temperature treatment process are set by setting the water content in the different parts to avoid gelatinization of the surface of the composite material due to non-uniform heating. be able to.

Further improved, in the heat and pressurization process, the intermediate region and the surrounding region of the wooden board are heated at high frequencies, respectively, and the high frequency ratio of the intermediate region and the high frequency ratio of the surrounding region are 1: 0.88-0.94. is there. In the curing treatment process, the intermediate region and the peripheral region of the heat-compressed plate are heated at high frequencies, respectively, and the high frequency ratio of the intermediate region and the high frequency ratio of the peripheral region are 1: 0.93-0.96.

Further improved, the specific method of curing treatment is to place the temperature-lowered wooden board on a horizontal dry surface, apply a pressure of 5.5-7.2 Mpa to the wooden board surface, cure for 3 days, and then apply the pressure. Reduce by 1.2-1.5 Mpa daily, repeat this step until the pressure is zero and continue to cure for 10-13 days.

Further improved, the specific method of wood pretreatment is to flatten the surface of the wood so that the thickness does not exceed 10 cm, and dry the wood at high frequencies to an average moisture content of 8-18%. The high frequency is 2-2.5 MHz and the temperature of the wood is 55-60 ° C.

Further improved, when the thickness of the wood board subjected to the heat and pressure treatment in step c is 1 cm or less, the upper surface or the lower surface of the wood board before the heat and pressure treatment is coated with an electrically insulating cloth.

In the present invention, when the thickness of the wood board after the heat and pressure treatment is 1 cm or less, the thickness of the wood board is insufficient by installing the electrically insulating cloth on the upper surface or the lower surface of the wood board after the pretreatment, so that the high frequency is generated. It is possible to prevent a strong arc from being generated and the equipment from burning out.

Further improved, the raw material for producing the wood board is selected from one or more of poplar, shinanoki and radiata pine.

Further refined, a polishing process is required before using the material.

The materials provided by the present invention can be used to manufacture aircraft carrier internal warehouses, warship internal warehouses, cruise ship internal warehouses, floors, doors or cabinets. The materials produced by the methods provided by the present invention are environmentally friendly, safe and do not cause any injury to the human body.

The high-frequency mixed composite material provided in the present invention is characterized by high strength, high toughness, low content of formaldehyde and xylene, and also has waterproof and crack-preventing performance.

It is a cross-sectional view of a mixed composite material by high frequency (each pretreated wood board is laminated in the indirect pressure direction to prepare a laminated board). It is a top view of the mixed composite material by high frequency (each pretreated wood board is laminated in the indirect pressure direction to prepare a laminated board). It is a real drawing of a non-adhesive composite material of a mixed material by high frequency made from a wooden board and a glass board. Here, 1 is the first wood board, 2 is the PVB interlayer film, 3 is the second wood board, 4 is the third wood board, and 5 is the fourth wood board. , 6 is a mortise and 7 is a mortise.

(Example 1-8)
In the eight kinds of high-frequency mixed composite materials according to Example 1-8 of the present invention, at least two wooden boards having a density of 0.7 kg / m ³ or less are produced by high-frequency heating, and a shrinkage connecting layer is formed between adjacent wooden boards. The formed composite material has a grain compression strength of 100-120 MPa and a bending strength of 200-230 MPa and is mainly produced by the following steps, ie.

a. Pretreatment: The wood board is treated to have a moisture content of 8% -18% and a thickness of 10 cm or less to prepare a pretreated wood board.

b. Laminating treatment: Two or more pretreated wood boards are stacked and arranged in at least one load direction to prepare a laminated wood board, and the load direction includes a direct pressure direction and an indirect pressure direction.

c. Heat and pressurization treatment: The degenerate connection layer of the laminated wood board is heated to a wood board temperature of 80 to 100 ° C., kept warm for 4 to 6 minutes, and pressure treatment is performed according to a preset compression rate according to the receiving direction.

d. Hardening treatment: The wood board that has been heat-pressurized is heated at a high frequency to a wood board temperature of 180-220 ° C., kept warm for 5 to 8 minutes, and hardened to prepare a hardened wood board.

e. Temperature lowering treatment: The surface of the wood board cured by the water cooling technology is cooled to the wood board temperature of 70-90 ° C at a rate of 5-15 ° C./min, and the water flow velocity of the water cooling technology is 0.9-1.5 m / s. When cooling to a wood board surface temperature of 85-90 ° C, wind cooling is performed, the wind speed is 9.2-9.7 m / s, the wind temperature is 55-60 ° C, preferably the wind direction and above the wood board. The angle formed by the lower surface is 55-58 °.

f. Curing treatment: The temperature-decreased wooden board is left at room temperature for 15 to 20 days to obtain a mixed composite material by high frequency .

Step b In the laminating step, two or more pretreated wood boards are directly stacked and arranged in the load direction to prepare a laminated wood board, and a thermoplastic resin thin film is installed between two adjacent pretreated wood boards. ..

The thermoplastic resin thin film has a thickness of 0.5-0.9 mm and a viscosity of 15.6-16.4 Pa. It is a PVB interlayer film having s and elasticity of 8-9 × 10 ⁶ Pa · s, and the area ratio of the contact surface between the wooden board and the PVB intermediate film is 100: 1-100: 100.

The PVB film of the present invention was purchased from Shanghai Meibang Plastic Co., Ltd.

The preset compressibility P in step c is preset by the following method so that the density after compression is higher than the density of any wood board before compression.

In Examples 1-8 of the present invention, the wooden boards are arranged one above the other before heating and pressurizing.

Here, the specific parameters of Examples 1-8 of the present invention are shown in Table 1.

Table 1: Specific parameters of Example 1-8

Here, PVA is a vinyl alcohol resin, PVB is a butyraldehyde resin of vinyl alcohol, and PVC is a polyvinyl chloride resin. The heating temperature 1 and the heat retention time 1 are the temperature and time during the heating and pressurizing treatment, and the heating and pressurizing frequency ratio is obtained by heating the intermediate region and the surrounding region of the wooden board at high frequencies in the process of the heating and pressurizing treatment, respectively. , The ratio of the high frequency of the intermediate region to the high frequency of the surrounding region, and the curing process frequency ratio is the intermediate region by heating the intermediate region and the peripheral region of the heat-compressed wooden board at high frequencies in the curing process. The ratio of the high frequency to the high frequency in the surrounding region, the heating temperature 2 and the heat retention time 2 are the temperature and time at the time of curing, and the water content is the average water content of the wooden board, and the average of 5 in the wooden board. When one point is used as a measurement point and the water content is measured at each point, the average water content is the sum of the five water contents divided by five.
(Example 9-11)

Examples 9-11 of the present invention are based on the parameters of Example 5, and the differences between them are as follows.

The number of wooden boards is 5, the thickness of each wooden board is the same, 8 cm, the step d curing treatment is heating by high frequency, the number of high frequency electrode arrangements is N, and the electrode arrangement of the pretreated wood boards is Divide evenly into N parts along the side-by-side arrangement, measure the average moisture content Q of each part, and let T be the temperature of the plate and t be the heating time when high frequency heating is performed in the curing process. Q, T, and t satisfy the following conditions.

When 8% ≤ Q ≤ 10%, 180 ° C ≤ T ≤ 185 ° C, 1 min ≤ t <2 min.
When 10% <Q ≦ 12%, 185 ° C <T ≦ 190 ° C, 2 min ≦ t <4 min.
When 12% <Q ≦ 14%, 190 ° C <T ≦ 200 ° C, 4 min ≦ t <5 min.
When 14% <Q ≦ 18%, 200 ° C. <T ≦ 210 ° C., 5 min ≦ t ≦ 6 min.

In step b laminating treatment, five pretreated wooden boards are stacked and arranged in the indirect pressure direction to prepare a laminated wooden board. The densities of the adjacent first pretreated wood board and the second pretreated wood board are ρa and ρb equal to or more than ρa, respectively, and the edge of the texture direction in which the first pretreated wood board and the second pretreated wood board are adjacent to each other. Is provided with a mortise in which the gap between the mortise and the tip is matched, and at least one rough surface having a roughness Ra is provided on the mortise, and Ra = w / ρa, w> 0. In the embodiment of, w = 5.

The specific parameters of Examples 9-11 of the present invention are shown in Table 2.

Table 2: Specific parameters of Examples 9-11 (N = 5)

Moisture content is the average moisture content of the same portion of three wooden boards. When the water content of each point is measured with three points as measurement points on the same part of the three wooden boards, the average water content is the sum of the nine water contents divided by 9, and ρa is five. It is the density of the wood board with the highest density among the wood boards, and Ra is the rough surface of the tip of the wood board.
(Example 12)

The high-frequency mixed composite material according to the present embodiment is formed by pressing a wooden plate and a glass plate, and a heating wire is built in the glass plate, and specifically includes the following steps.

The density of the wood board is 0.55 kg / m ³ , the thickness of the glass board is 1.5 cm, and the composite material is mainly produced by the following steps.

a. Pretreatment: The wood board is treated to have a moisture content of 10% and a thickness of 8 cm or less to prepare a pretreated wood board.

b. Laminating treatment: Two pretreated wooden boards are placed on top of each other in the load direction, and a glass plate is sandwiched between the two wooden boards to prepare a laminated wooden board.

c. Heat and pressurization treatment: The degenerate connection layer of the laminated wood board is heated to a wood board temperature of 90 ° C., kept warm for 5 minutes, and pressure treatment is performed according to a preset compression rate (preset compressibility P = 35%).

d. Hardening treatment: A wood board that has been heat-pressurized is heated to a wood board temperature of 220 ° C. at a high frequency, kept warm for 6 minutes, and cured to prepare a hardened wood board.

e. Temperature lowering treatment: When the surface of the wood board cured by the water cooling technology is cooled to the wood board temperature of 80 ° C at a rate of 10 ° C / min, the water flow velocity of the water cooling technology is 1 m / s, and the wood board surface temperature is cooled to 88 ° C. The wind is cooled, the wind speed is 9.5 m / s, the temperature of the wind is 58 ° C., and preferably, the angle between the wind direction and the upper and lower surfaces of the wooden board is 56 ° C.

f. Curing treatment: The temperature-decreased wooden board is left at room temperature for 18 days to obtain a mixed composite material by high frequency .

A thermoplastic resin thin film is installed between the pretreated wood board and the glass board.

The thermoplastic resin thin film has a thickness of 0.7 mm and a viscosity of 16 Pa. It is a PVB interlayer film having s and elasticity of 8.5 × 10 ⁶ Pa · s, and the area ratio of the contact surface between the wooden board and the PVB intermediate film is 2: 1.

The PVB film of the present invention was purchased from Shanghai Meibang Plastic Co., Ltd.
(Example 13)

The high-frequency mixed composite material according to this embodiment is formed by pressing a wooden board and a ceramic board, and specifically includes the following steps.

The density of the wood board is 0.55 kg / m ³ , the thickness of the ceramic board is 1.5 cm, and the composite material is mainly produced by the following steps.

a. Pretreatment: The wood board is treated to have a moisture content of 10% and a thickness of 8 cm or less to prepare a pretreated wood board.

b. Laminating treatment: Two pretreated wooden boards are arranged so as to be stacked in at least one load direction to prepare a laminated wooden board, and the load direction includes a direct pressure direction and an indirect pressure direction.

c. Heat-pressurization treatment: The degenerate connection layer of the laminated wood board is heated to a wood board temperature of 90 ° C., kept warm for 5 minutes, and pressure-treated according to a preset compressibility (P = 35%) according to the receiving direction.

d. Hardening treatment: A wood board that has been heat-pressurized is heated to a wood board temperature of 200 ° C. at a high frequency, kept warm for 6 minutes, and cured to prepare a hardened wood board.

e. Temperature lowering treatment: When the surface of the wood board cured by the water cooling technology is cooled to the wood board temperature of 80 ° C at a rate of 10 ° C / min, the water flow velocity of the water cooling technology is 1 m / s, and the wood board surface temperature is cooled to 88 ° C. The wind is cooled, the wind speed is 9.5 m / s, the temperature of the wind is 58 ° C., and preferably, the angle between the wind direction and the upper and lower surfaces of the wooden board is 56 ° C.

f. Curing treatment: The temperature-decreased wooden board is left at room temperature for 18 days to obtain a mixed composite material by high frequency .

A thermoplastic resin thin film is installed between the pretreated wood board and the ceramic board.

The thermoplastic resin thin film has a thickness of 0.7 mm and a viscosity of 16 Pa. It is a PVB interlayer film having s and elasticity of 8.5 × 10 ⁶ Pa · s, and the area ratio of the contact surface between the wooden board and the PVB intermediate film is 2: 1.

The PVB film of the present invention was purchased from Shanghai Meibang Plastic Co., Ltd.
(Example 14)

The high-frequency mixed composite material according to this embodiment is formed by pressing a wooden plate and an iron plate, and specifically includes the following steps.

The density of the wood board is 0.55 kg / m ³ , the thickness of the iron board is 1.5 cm, and the composite material is mainly produced by the following steps.

a. Pretreatment: The wood board is treated to have a moisture content of 10% and a thickness of 8 cm or less to prepare a pretreated wood board.

b. Laminating treatment: Two pretreated wooden boards are placed one on top of each other in the load direction to prepare a laminated wooden board.

c. Preheat treatment: The laminated wood board is preheated to 110 ° C. at a high frequency to prepare a preheated wood board.

d. Heat-pressurization treatment: An iron plate is placed between two preheated wooden boards, a thermoplastic resin thin film is placed between the iron plate and the preheated wooden board, held for 5 minutes, and a preset compression ratio (preset). Pressurization treatment is performed according to the obtained compressibility P = 30%).

e. Temperature lowering treatment: When the surface of the wood board cured by the water cooling technology is cooled to the wood board temperature of 80 ° C at a rate of 10 ° C / min, the water flow velocity of the water cooling technology is 1 m / s, and the wood board surface temperature is cooled to 88 ° C. The wind is cooled, the wind speed is 9.5 m / s, the temperature of the wind is 58 ° C., and preferably, the angle between the wind direction and the upper and lower surfaces of the wooden board is 56 ° C.

f. Curing treatment: The temperature-decreased wooden board is left at room temperature for 18 days to obtain a mixed composite material by high frequency .

The thermoplastic resin thin film has a thickness of 0.7 mm and a viscosity of 16 Pa. It is a PVB interlayer film having s and elasticity of 8.5 × 10 ⁶ Pa · s, and the area ratio of the contact surface between the wooden board and the PVB intermediate film is 2: 1.

The PVB film of the present invention was purchased from Shanghai Meibang Plastic Co., Ltd.

Here, the iron plate may be replaced with another metal plate.
(Example 15)

The high-frequency mixed composite material according to this embodiment is formed by pressing a wooden plate and a glass plate, and specifically includes the following steps.

The density of the wood board is 0.55 kg / m ³ , the thickness of the iron board is 1.5 cm, and the composite material is mainly produced by the following steps.

a. Pretreatment: The wood board is treated to have a moisture content of 10% and a thickness of 8 cm or less to prepare a pretreated wood board.

b. Laminating treatment: A sand painting is placed on one pretreated wooden board, a thermoplastic resin thin film is covered on the sand painting, and a glass plate is further placed on the thermoplastic resin thin film to prepare a laminated wooden board.

c. Heat-pressurization treatment: The degenerate connection layer of the laminated wood board is heated to a wood board temperature of 90 ° C., kept warm for 5 minutes, and pressure-treated according to a preset compressibility (P = 35%) according to the receiving direction.

d. Hardening treatment: A wood board that has been heat-pressurized is heated to a wood board temperature of 200 ° C. at a high frequency, kept warm for 6 minutes, and cured to prepare a hardened wood board.

e. Temperature lowering treatment: When the surface of the wood board cured by the water cooling technology is cooled to the wood board temperature of 80 ° C at a rate of 10 ° C / min, the water flow velocity of the water cooling technology is 1 m / s, and the wood board surface temperature is cooled to 88 ° C. The wind is cooled, the wind speed is 9.5 m / s, the temperature of the wind is 58 ° C., and preferably, the angle between the wind direction and the upper and lower surfaces of the wooden board is 56 ° C.

f. Curing treatment: The temperature-decreased wooden board is left at room temperature for 18 days to obtain a mixed composite material by high frequency .

The thermoplastic resin thin film has a thickness of 0.7 mm and a viscosity of 16 Pa. It is a PVB interlayer film having s and elasticity of 8.5 × 10 ⁶ Pa · s, and the area ratio of the contact surface between the wooden board and the PVB intermediate film is 2: 1.

The PVB film of the present invention was purchased from Shanghai Meibang Plastic Co., Ltd.
(Example 16)

The high-frequency mixed composite material according to the present embodiment is formed by pressing a wooden plate and a glass plate, and specifically includes the following steps.

The density of the wood board is 0.55 kg / m3, the thickness of the iron board is 1.5 cm, and the composite material is mainly produced by the following steps.

a. Pretreatment: The wood board is treated to have a moisture content of 10% and a thickness of 8 cm or less to prepare a pretreated wood board.

b. Laminating treatment: A photograph is placed on one pretreated wooden board, a thermoplastic resin thin film is covered on the photograph, and a glass plate is further placed on the thermoplastic resin thin film to prepare a laminated wooden board.

c. Heat and pressurization treatment: The degenerate connection layer of the laminated wood board is heated to a wood board temperature of 90 ° C., kept warm for 5 minutes, and pressure treatment is performed according to a preset compression rate (P = 35%) according to the receiving direction.

d. Hardening treatment: A wood board that has been heat-pressurized is heated to a wood board temperature of 200 ° C. at a high frequency, kept warm for 6 minutes, and cured to prepare a hardened wood board.

e. Temperature lowering treatment: The surface of the wood board cured by the water cooling technology is cooled to the wood board temperature of 80 ° C. at a rate of 10 ° C./min, and the water flow velocity of the water cooling technology is 88 m / s, and the wood board surface temperature is cooled to 85-90 ° C. At that time, the wind is cooled, the wind speed is 9.5 m / s, the temperature of the wind is 58 ° C., and preferably, the angle between the wind direction and the upper and lower surfaces of the wooden board is 56 ° C.

f. Curing treatment: The temperature-decreased wooden board is left at room temperature for 18 days to obtain a mixed composite material by high frequency .

The thermoplastic resin thin film has a thickness of 0.7 mm and a viscosity of 16 Pa. It is a PVB interlayer film having s and elasticity of 8.5 × 10 ⁶ Pa · s, and the area ratio of the contact surface between the wooden board and the PVB intermediate film is 2: 1.

The PVB film of the present invention was purchased from Shanghai Meibang Plastic Co., Ltd.
(Example 17)

The high-frequency mixed composite material according to the present embodiment is formed by pressing a wooden plate and a glass plate, and specifically includes the following steps.

The density of the wood board is 0.55 kg / m ³ , the thickness of the iron board is 1.5 cm, and the composite material is mainly produced by the following steps.

a. Pretreatment: The wood board is treated to have a moisture content of 10% and a thickness of 8 cm or less to prepare a pretreated wood board.

b. Laminating treatment: A 4D printer is installed on one pretreated wooden board, a thermoplastic resin thin film is covered on the wooden board, and a glass plate is further placed on the thermoplastic resin thin film to prepare a laminated wooden board.

c. Heat and pressurization treatment: The degenerate connection layer of the laminated wood board is heated to a wood board temperature of 90 ° C., kept warm for 5 minutes, and pressure treatment is performed according to a preset compression rate (P = 35%) according to the receiving direction.

d. Hardening treatment: A wood board that has been heat-pressurized is heated to a wood board temperature of 200 ° C. at a high frequency, kept warm for 6 minutes, and cured to prepare a hardened wood board.

e. Temperature lowering treatment: When the surface of the wood board cured by the water cooling technology is cooled to the wood board temperature of 80 ° C at a rate of 10 ° C / min, the water flow velocity of the water cooling technology is 1 m / s, and the wood board surface temperature is cooled to 88 ° C. The wind is cooled, the wind speed is 9.5 m / s, the temperature of the wind is 58 ° C., and preferably, the angle between the wind direction and the upper and lower surfaces of the wooden board is 56 ° C.

f. Curing treatment: The temperature-decreased wooden board is left at room temperature for 18 days to obtain a mixed composite material by high frequency .

The thermoplastic resin thin film has a thickness of 0.7 mm and a viscosity of 16 Pa. It is a PVB interlayer film having s and elasticity of 8.5 × 10 ⁶ Pa · s, and the area ratio of the contact surface between the wooden board and the PVB intermediate film is 2: 1.

The PVB film of the present invention was purchased from Shanghai Meibang Plastic Co., Ltd.
(Example 18)

The high frequency mixed composite material according to this embodiment is formed by pressing two wooden boards, and specifically includes the following steps.

The density of the two wood boards is 0.55 kg / m ³ , and the composite material is mainly produced in the following steps.

a. Pretreatment: The wood board is treated to have a moisture content of 10% and a thickness of 8 cm or less to prepare a pretreated wood board.

b. Laminating treatment: Two pretreated wooden boards are placed one on top of the other in the load direction, a thermoplastic resin thin film is sandwiched between the two boards, and citron oil is sprayed on both the front and back surfaces of the thermoplastic resin thin film to reduce the injection density to 0. . Make a laminated wood board at 5 ml / cm ² .

c. Heat and pressurization treatment: The degenerate connection layer of the laminated wood board is heated to a wood board temperature of 90 ° C., kept warm for 5 minutes, and pressure treatment is performed according to a preset compressibility (P = 35%) according to the receiving direction.

d. Hardening treatment: A wood board that has been heat-pressurized is heated to a wood board temperature of 200 ° C. at a high frequency, kept warm for 6 minutes, and cured to prepare a hardened wood board.

e. Temperature lowering treatment: When the surface of the wood board cured by the water cooling technology is cooled to the wood board temperature of 80 ° C at a rate of 10 ° C / min, the water flow velocity of the water cooling technology is 1 m / s, and the wood board surface temperature is cooled to 88 ° C. The wind is cooled, the wind speed is 9.5 m / s, the temperature of the wind is 58 ° C., and preferably, the angle between the wind direction and the upper and lower surfaces of the wooden board is 56 ° C.

f. Curing treatment: The temperature-decreased wooden board is left at room temperature for 18 days to obtain a mixed composite material by high frequency .

The thermoplastic resin thin film has a thickness of 0.7 mm and a viscosity of 16 Pa. It is a PVB interlayer film having s and elasticity of 8.5 × 10 ⁶ Pa · s, and the area ratio of the contact surface between the wooden board and the PVB intermediate film is 2: 1.

The PVB film of the present invention was purchased from Shanghai Meibang Plastic Co., Ltd.

Here, citron oil may be replaced with another perfume, and the present invention is not specifically limited.
(Example 19)

The high frequency mixed composite material according to this embodiment is formed by pressing two wooden boards and 40 crushed wood strips, and specifically includes the following steps.

The density of the two wood boards is 0.55 kg / m ³ , and the composite material is mainly produced in the following steps.

a. Pretreatment: The wood board is treated to have a moisture content of 10% and a thickness of 8 cm or less to prepare a pretreated wood board.

b. Laminating treatment: Two pretreated wood boards are placed one on top of the other in the load direction, 40 crushed wood strips are evenly placed between the two pretreated wood boards, and between the pretreated wood boards and the crushed wood strips. A thermoplastic resin thin film is placed in the wood to prepare a laminated wooden board.

c. Heat-pressurization treatment: The degenerate connection layer of the laminated wood board is heated to a wood board temperature of 90 ° C., kept warm for 5 minutes, and pressure-treated according to a preset compressibility (p = 35%) according to the receiving direction.

d. Hardening treatment: A wood board that has been heat-pressurized is heated to a wood board temperature of 200 ° C. at a high frequency, kept warm for 6 minutes, and cured to prepare a hardened wood board.

e. Temperature lowering treatment: When the surface of the wood board cured by the water cooling technology is cooled to the wood board temperature of 80 ° C at a rate of 10 ° C / min, the water flow velocity of the water cooling technology is 1 m / s, and the wood board surface temperature is cooled to 88 ° C. The wind is cooled, the wind speed is 9.5 m / s, the temperature of the wind is 58 ° C., and preferably, the angle between the wind direction and the upper and lower surfaces of the wooden board is 56 ° C.

f. Curing treatment: The temperature-decreased wooden board is left at room temperature for 18 days to obtain a mixed composite material by high frequency .

The thermoplastic resin thin film has a thickness of 0.7 mm and a viscosity of 16 Pa. It is a PVB interlayer film having s and elasticity of 8.5 × 10 ⁶ Pa · s, and the area ratio of the contact surface between the wooden board and the PVB intermediate film is 2: 1.

The PVB film of the present invention was purchased from Shanghai Meibang Plastic Co., Ltd.

The thickness of the crushed wood strips is 0.8 cm, and 40 crushed wood strips are pasted and arranged side by side, and the length of the side after the arrangement is the same as the length of the side of the pretreated wood board.

When the appropriate material produced by stamping is cut, the tiger skin crest appears.

Control example 1-23

The 23 types of high-frequency mixed composite materials according to Control Examples 1-23 of the present invention differ from Example 8 in terms of parameters, and specific parameters are shown in Tables 3, 4, and 5.

Table 3: Specific parameters of Control Example 1-8

Table 4: Specific parameters of Control Examples 9-16

Table 5: Specific parameters of Control Examples 17-23

Control Examples 24-26

The three types of high frequency mixed composite materials according to Control Examples 24-26 of the present invention.

Table 6: Specific parameters of Control Examples 24-26 (N = 5)

Here, the two wooden boards in Example 1 are manufactured by adopting poplar and Shinanoki, respectively, and the three wooden boards of all the test examples and control examples other than Example 1 are poplar and Shinanoki. Manufactured using each Radiata Pine.

Test Example 1

Consideration of the performance index of each set of composite materials is as follows.

Composite materials were produced using the methods of Examples 1-8 and Control Examples 1-23, respectively, and the specific gravity, grain pressure resistance, grain tensile strength, bending strength, grain shear, horizontal pattern shear of each type of composite material were used for 14 days. The deformation recovery rate is measured, five parallel samples of each type of composite material are prepared, the results are evaluated as average values, and the results of consideration are shown in Table 7.

Table 7: Consideration of each parameter of high temperature and high pressure processing

As can be seen from Table 7, each performance index of the composite material obtained by the method provided in the present invention has achieved a good effect, and when any of these parameters is changed, some of them are obtained. The performance index will decrease.

Test Example 2

Composite materials were produced using the methods of Examples 9-11 and Control Examples 24-26, respectively, and five points (for example, four corners and a center point) were uniformly selected as measurement points on each type of composite material, and each of them was uniformly selected. The water content of the points was measured, the standard deviation of the water content was calculated, five parallel samples were prepared for each type of composite material, the results were evaluated as mean values, and the results of consideration are shown in Table 8. ..

Table 8: Results of moisture content uniformity test

As can be seen from Table 8, by setting the heating temperature and the heating time according to the water content of the different points provided in the present invention, the water content of each part is made more uniform and the performance of each part is made more uniform. can do.

Test Example 3

The drying conditions and moisture content of the pretreated wood are considered, and the results of the consideration are shown in Table 9. The average moisture content is the average value of the moisture content measured in different layers on the surface and inside of the wood, and the difference in moisture content is the difference between the maximum and minimum values of each measured moisture content.

Table 9: Results of water content difference measurement

As can be seen from Table 9, the pretreatment drying method provided by the present invention has a short time, a small difference in moisture content, and more uniform moisture content of the wood pretreated by the pretreatment method provided by the present invention. Can be.

Claims (9)

Density 0.7 kg / ^{m 3} or less of at least two wooden plates were prepared by pressing at a high frequency heating, the connection layer is formed on the adjacent wooden plates, compressive strength is 100-120MPa, flexural strength Is 200-230 MPa, mainly the following
a. Pretreatment: The wood board is treated to a moisture content of 8% -18% and a thickness of 10 cm or less to prepare a pretreatment wood board.
b. Laminating treatment: Two or more pretreated wooden boards are stacked and arranged in at least one load direction to prepare a laminated wooden board, and the load directions are a direct load direction parallel to the stacking direction of the wooden boards and a direct load direction. Including the indirect pressure direction perpendicular to
c. Heating and pressurizing treatment: the connection layers of the laminated wood board is heated to a wooden board temperature 80-100 ° C., and 4-6min kept performs pressure treatment according to the compression ratio set in advance depending on the force receiving direction,
d. Hardening treatment: The wood board that has been heat-pressurized is heated at a high frequency to a wood board temperature of 180-220 ° C., kept warm for 5-8 minutes, and hardened to prepare a hardened wood board.
e. Temperature lowering treatment: The plate surface after curing treatment by water cooling technology is cooled to a plate temperature of 70-85 ° C at a rate of 5-15 ° C / min, and the water flow rate of water cooling technology is 0.9-1.5 m / s. The board surface temperature is cooled to 88-90 ° C and the air is cooled at the same time. The wind speed is 9.2-9.7 m / s and the air temperature is 55-60 ° C. The angle between the wind direction and the upper and lower surfaces of the wooden board. Are all 55-58 °,
f. Curing treatment: The temperature-decreased wooden board is left at room temperature for 15 to 20 days to obtain a mixed composite material by high frequency.
A method for producing a mixed composite material using a high frequency, which is characterized in that it is produced in the af step. Connection layer formed on the two wooden plates adjacent in the composite material is a tenon destination and mortise interference fit, in step b lamination process, indirect pressure direction two or two or more pretreatment wood board The densities of the adjacent first pre-treated wood board and the second pre-treated wood board, which are arranged on top of each other to produce a laminated wood board, are ρa and ρa or more, respectively, and the first pre-treated wood board and the second pre-treated wood board. At the edge of the texture direction adjacent to the pre-treated wood board, mortise holes are provided in which the gaps between the mortises and the mortises are matched, and at least one rough surface having a roughness Ra is provided on the mortises. The method for producing a mixed composite material using a high frequency according to claim 1, wherein w / ρa and w> 0. Connection layer that will be formed into two trees plates adjacent in the composite material is a thermoplastic resin film between the two uneven surfaces and two concave-in step b lamination step, two or more two The high frequency according to claim 1, wherein the pretreated wood boards of the above are directly stacked in the load direction to prepare a laminated wood board, and a thermoplastic resin thin film is installed between two adjacent pretreated wood boards. A method for producing a mixed composite material by. The thermoplastic resin thin film has a thickness of 0.5-0.9 mm and a viscosity of 15.6-16.4 Pa. s, elastic 8-9 × 10 ⁶ Pa · s PVB interlayer film, according to claim 3, wherein the area ratio of the contact surface between the wooden board and the PVB interlayer film is 100: 1-100: 100. A method for producing a mixed composite material by high frequency. Connection layer that will be formed into two trees plates adjacent in the composite material is a two engaged uneven surface, the non-peak portion and the non-dip portion of the two irregular surface is a thermoplastic resin film The method for producing a mixed composite material using a high frequency according to claim 3, wherein the mixed composite material is produced. The preset compressibility P in step c is such that the density after compression is higher than the density of any wood board before compression.

The high-frequency mixed composite material according to claim 1, wherein the mixed composite material is preset by the method described above. Step d The curing process is heating with high frequency, and the number of high frequency electrode arrangements is N, and the pretreated wood board is evenly divided into N parts along the direction in which the electrode arrangements are arranged side by side, and each part is divided into N parts. When the average moisture content Q is measured and high frequency heating is performed in the curing process, the temperature of the plate is T, the heating time is t, and Q, T, t are
When 8% ≤ Q ≤ 10%, 180 ° C ≤ T ≤ 185 ° C, 1 min ≤ t <2 min.
When 10% <Q ≦ 12%, 185 ° C <T ≦ 190 ° C, 2 min ≦ t <4 min.
When 12% <Q ≦ 14%, 190 ° C <T ≦ 200 ° C, 4 min ≦ t <5 min.
When 14% <Q ≦ 18%, 200 ° C. <T ≦ 210 ° C., 5 min ≦ t ≦ 6 min.
The method for producing a mixed composite material using a high frequency according to claim 2, wherein the condition is satisfied. The specific method of curing is to place the temperature-lowered wooden board on a horizontal dry surface, apply a pressure of 5.5-7.2 Mpa to the wooden board surface, cure for 3 days, and then apply the pressure to 1.2- every day. The method for producing a mixed composite material by high frequency according to claim 1, wherein this step is performed by reducing the amount by 1.5 MPa until the pressure becomes 0, and the curing is continued for 10 to 13 days. The specific method of pretreatment of wood is to flatten the surface of the wood so that the thickness does not exceed 10 cm, dry the wood at a high frequency to an average moisture content of 8-18% of the wood, and have a high frequency of 2. The method for producing a mixed composite material by high frequency according to claim 1, wherein the temperature is −2.5 MHz and the temperature of wood is 55-60 ° C.

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