JP6803419B2 - Manufacturing method of composite uneven plate 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 manufacturing a composite uneven board material by high frequency.

With conventional plate materials, there are various methods to realize the unevenness effect by using a mold or engraving, but in the conventional method, the unevenness effect is generally achieved by using a preset mold. Realized, it is not possible to express the natural grain of wood, the patterns of each wood board are similar, the traces of human processing are clear, and the grain of uneven wood appears randomly on each wood board. The process of making the mold and engraving is complicated and costly, and the conventional methods for realizing the unevenness effect are limited to the density of the plate material, and the density is insufficient. In such a case, it cannot be used for producing a concavo-convex plate material.

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

Specific technical solutions of the present invention are as follows.

Complex uneven sheet by high frequency according to the present invention has an uneven upper surface and / or underside. It is mainly made in the next step.

a. Pretreatment: density 0.5 kg / ^{m 3} the water content of 8% -18% of the wood board not exceeding processes below thickness 2 cm,

b. Heat treatment: N pretreated wood boards are selected and put into contact with each other, N ≧ 2, and the pretreated wood boards are heated to a wood board temperature of 60 ° C-80 ° C at a high frequency and kept warm for 2-3 minutes.

c. Pressurization: The heat-treated wood board is compressed with a preset compression rate S, the preset compression rate is set to 10% -70%, and the thickness of contact of N wood boards is defined by U1. The thickness after pressurization is U2, S = U2 / U1.

d. Hardening treatment: Under the condition that the preset compression ratio does not change, the pressure-treated wood board is heated at a high frequency of 200-240 ° C. and kept warm for 4-6 minutes.

e. Temperature lowering treatment: The pressure-treated wooden board is subjected to temperature lowering treatment under the condition that the preset compression rate does not change.

f. Curing treatment: The temperature-decreased wooden board is left at room temperature for 8 to 10 days to obtain a composite uneven board material by high frequency.

Here, the grain direction of the wood board is perpendicular to the thickness direction. Unevenness of the uneven sheet manufactured in the present invention has a randomness, maintaining the characteristics of the original natural wood, or sculpture, cumbersome processing steps such or using a mold does not require the compression at a time Then, m uneven surfaces having different shapes are generated. The number m, m = 2 * (o -1) of the uneven surface (o ≧ 2, o denotes the number of plates), and there is uneven plate two of them having a concavo-convex on one side, uneven plate having irregularities on both surfaces It has m-2 pieces, uneven plate manufactured by the method of the present invention can have an uneven irregularities or both sides to one side if necessary, increase the natural beauty Kiban. The production method provided by the present invention is simple, and by some of the above steps, it is possible to press-process a concavo-convex plate material having irregularities on a plurality of woods , and to reduce the content of formaldehyde and xylene to zero. Can be done.

Preferably, the N wood boards selected prior to step b heat treatment can be cut with one board, the thickness of the N wood boards may be the same or different, in the grain direction or on the slope. It can be cut along (5%, etc.). Preferably, it is incomplete sawing (shown in FIG. 3), leaving 0.5-1 cm at the edge of the wood boards to connect the three wood boards, thereby preventing misalignment of the upper and lower wood boards after compression. The uneven plate material produced by this method can secure unevenness more uniformly and is easy to transport.

Preferably, by installing the hot melt adhesive film on the edge of the adjacent wooden board 0.5-1 cm, it is possible to prevent the upper and lower wooden boards from being displaced after compression, and the uneven board material produced by this method has unevenness . It can be secured more evenly and is easy to transport.

Further improved, step a The surface roughness of the pretreated wood board does not exceed 2.5 μm.

In the present invention, by limiting the surface roughness of the wooden boards, it is possible to prevent the two adjacent wooden boards from being compressed and meshing with each other to be difficult to separate.

Further improved, in the heat treatment process, the intermediate region and the surrounding region of the wood are heated at a high frequency, and the high frequency ratio of the intermediate region to the surrounding region is 1: 0.88 to 0.94, and the curing treatment is performed. Then, the intermediate region and the surrounding region of the heat-compressed wood are heated at high frequencies, respectively, and the high frequency ratio of the intermediate region to the high frequency ratio of the surrounding region is 1: 0.93-0.96.

According to the above limitation, the present invention can prevent the outer layer wood board from being burnt and the temperature of the inner layer wood board from failing to be compressed which does not satisfy the requirement.

Further improved, in step b, the density difference of any two of the N wooden boards does not exceed 0.15 kg / m ³ .

According to the present invention, the depth of unevenness of the wood board after compression can be improved by specifically limiting the density difference between any two wood boards during the heat treatment.

Further improved, the step e temperature lowering treatment specifically includes the following steps.

The wood board surface cured by the water cooling technology is cooled to an average wood board temperature of 70-90 ° C at a rate of 5-15 ° C./min, the water flow velocity of the water cooling technology is 4.5-5 m / s, and the wood board surface temperature is 120. When cooling to -130 ° C, wind cooling is performed, the wind speed is 9.2-9.7 m / s, the wind temperature is 55-60 ° C, and the angle between the wind direction and the upper and lower surfaces of the wooden board is either. Is also 55-58 °.

According to the present invention, the deformation recovery rate of the uneven plate material can be reduced to 0.5% by lowering the temperature by the above method.

Further improved, the pretreatment of step a includes overlapping and contacting the wooden boards in the horizontal direction, arranging and contacting the wooden boards in the vertical direction, and arbitrarily combining the two, preferably the wooden boards. There are three compression directions, and at least two wooden boards are prepared in each compression direction.

The method provided in the present invention may compress the wooden boards arranged in a horizontal direction, may compress a plurality of wooden boards in a vertical direction, or arrange them in a horizontal direction. And the arrangement in the vertical direction may be combined. The unevenness pressed by the three patterns is different from each other, and the unevenness can be pressed by contacting an extra edging or a small wooden board having unevenness on the upper surface and / or the lower surface of each wooden board to eliminate waste.

Further improving, when the wood boards are overlapped and contacted, the average density of each wood board is assumed to be P and the density of each wood board is ρ1, ρ2 ... ρn, respectively.

In the present invention, the compression rate can be adjusted according to the density of the wooden board by the above method, and the compression rate is too small to press the unevenness , or the compression rate is too large and the unevenness is too deep. It is possible to avoid unsightly appearance and cracking.

Further improved, when the thickness of the pressure-treated wood board in step c is 1 cm or less, the upper surface or the lower surface of the pre-treated wood board is coated with an electrically insulating cloth.

According to the present invention, by coating the upper surface and the lower surface of the pretreated wooden board with an electrically insulating cloth, it is possible to prevent the equipment from being burned by a strong arc generated during high frequency heating.

Further improved, the deformation recovery rate after leaving the composite uneven plate material for 14 days is less than 0.5%, and the bending strength is 80-100 MPa.

Further improved, the depth of the unevenness of the composite uneven plate material is 400-10000 μm.

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

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.

Unevenness of the uneven sheet manufactured in the present invention has a randomness, maintaining the characteristics of the original natural wood, or sculpture, cumbersome processing steps such or using a mold is not necessary, the method of the present invention in fabricated uneven plate can have an uneven irregularities or both sides to one side if necessary, increase the natural beauty Kiban.

It is sectional drawing of two concavo-convex board materials having unevenness on one side produced by compressing two wooden boards. .. It is sectional drawing of two concavo-convex plate material having unevenness on one side and one concavo- convex plate material having unevenness on both sides produced by compressing three wooden boards. .. It is an incomplete sawing in which one piece is cut into three wooden boards, and the cross section of two uneven board materials having unevenness on one side and one uneven plate material having unevenness on both sides, which is pressed by the three wooden boards. It is a figure. It is a concavo-convex plate material 1 produced by the method of the present invention. It is a concavo-convex plate material 2 produced by the method of the present invention. It is a concavo-convex plate material 3 produced by the method of the present invention. Note: The numbers in the figure represent each wooden board.

(Example 1-7)
The seven types of uneven plate materials according to Example 1-7 of the present invention are all produced by the following steps.

a. Pretreatment: density 0.5 kg / ^{m 3} the water content of 8% -18% of the wood board not exceeding processes below thickness 2 cm, to produce a pretreated wood board,

b. Heat treatment: N pre-treated wood boards are selected and put into contact with each other, N ≧ 2, and the pre-treated wood boards are heated to a wood board temperature of 80 ° C-100 ° C at a high frequency and kept warm for 2-3 minutes.

c. Pressurization: The heat-treated wood board is compressed with a preset compression rate S, the preset compression rate is set to 10% -70%, and the thickness of contact of N wood boards is defined by U1. The thickness after pressurization is U2, S = U2 / U1.

d. Hardening treatment: Under the condition that the preset compression ratio does not change, the pressure-treated wood board is heated at a high frequency of 200-240 ° C. and kept warm for 4-6 minutes.

e. Temperature lowering treatment: The pressure-treated wooden board is subjected to temperature lowering treatment under the condition that the preset compression rate does not change.

f. Curing treatment: The temperature-decreased wooden board is left at room temperature for 8 to 10 days to obtain a composite uneven board material by high frequency.

The surface roughness of the plate pretreated in step a is 2.5 μm or less.

In the heat treatment, the intermediate region and the surrounding region of the wood are heated at high frequencies, respectively, and the high frequency ratio of the intermediate region to the surrounding region is 1: 0.88-0.94. In the hardening treatment, the intermediate region and the surrounding region of the heat-compressed wood are heated at high frequencies, respectively, and the high frequency ratio of the intermediate region to the surrounding region is 1: 0.93-0.96.

The density difference between any two of the N wooden boards in step b is 0.15 kg / m ³ or less.

Step d The temperature lowering treatment specifically includes the following steps.

The wood board surface cured by the water cooling technology is cooled to an average wood board temperature of 70-90 ° C at a rate of 5-15 ° C./min, the water flow velocity of the water cooling technology is 4.5-5 m / s, and the wood board surface temperature is 120. When cooling to -130 ° C, wind cooling is performed, the wind speed is 9.2-9.7 m / s, the wind temperature is 55-60 ° C, and the angle between the wind direction and the upper and lower surfaces of the wooden board is either. Is also 55-58 °.

ここで、実施例１−７の具体的なパラメータを表１に示す。 When the wood boards are overlapped and brought into contact with each other, the compressibility of the wood boards processed at high pressure and high temperature is set to P, and each wood is used.

Here, the specific parameters of Example 1-7 are shown in Table 1.

(実施例８) Table 1: Specific parameters of Example 1-7

(Example 8)

The high-frequency composite uneven plate material according to Example 8 of the present invention is produced by the following steps.

a. Pretreatment: density 0.5 kg / ^{m 3} the water content of 8% -18% of the wood board not exceeding processes below thickness 2 cm,

b. Heat treatment: pretreated three contacting the wood board was placed, respectively the density of three wooden board ^{0.46kg / m 3, 0.39kg / m} 3, a 0.43 kg / ^{m 3,} wooden board The moisture content of the wood is controlled to 9%, 11%, 13%, and the thickness is controlled to 0.6 cm, 0.8 cm, and 0.4 cm, respectively, and the pretreated wood board is heated to a high frequency of 100 ° C. and heated. The time is 3 min.

c. Pressurization treatment: The heat-treated wood board is compressed with a preset compression rate S, the preset compression rate is 10%, the thickness of N wooden boards in contact with each other is U1, and the thickness after pressurization. If it is U2, then S = U2 / U1.

d. Hardening treatment: Under the condition that the preset compression ratio does not change, the pressure-treated wood board is heated to 2240 ° C. at a high frequency and kept warm for 5 minutes.

e. Temperature lowering treatment: Pressurized wooden boards are forcibly cooled for a certain period of time under low temperature conditions.

f. Curing treatment: The temperature-decreased wooden board is left at room temperature for 12 days to obtain a composite uneven board by high frequency.

Here, the step e temperature lowering treatment specifically includes the following steps.

e1: The high temperature treated wooden board in step d is placed in an environment of 95 ° C. for 8 minutes to obtain a first temperature lowering board.

e2: The first temperature-reducing wood board treated in step e1 is placed in an environment of 75 ° C. for 15 minutes to obtain a first temperature-reducing board.

e3: The second warming board treated in step e2 is placed in an environment of 45 ° C. for 20 minutes to obtain a first warming board.

Here, the raw materials for producing the wooden board are selected from poplar, Shinanoki and Radiata pine, respectively.

Here, the total thickness of the three pressurized wooden boards in step c is 0.9 cm, and the upper surface of the pretreated wooden boards is coated with an electrically insulating cloth.
(Control Example 1-14)

The 14 types of high-frequency composite concavo-convex plate materials according to Control Example 1-14 are different from Example 3 in terms of parameters, and specific parameters are shown in Tables 2 and 3.

Table 2: Specific parameters of Control Example 1-7

Table 3: Specific parameters of Control Examples 8-14

Table 4: Specific parameters of Control Examples 15-18

Here, the heating temperature 1 and the heat retention time 1 are the temperature and time during the heat and pressurization treatment, the heating temperature 2 and the heat retention time 2 are the temperature and time during curing, and the water content is the average of the wooden boards. It is the water content. Five points were uniformly selected as measurement points on the wooden board, the water content of each point was measured, and the average water content was the sum of the water contents of the five points divided by five. The two wooden boards in Example 1 were prepared by selecting from poplar and Shinanoki, respectively, and the three wooden boards of all Test Examples and Control Examples other than Example 1 were poplar, Shinanoki and Radiata Pine. It is manufactured by adopting each.
(Control Example 19)

The concavo-convex plate material according to Control Example 19 is produced by the following steps.

a. Pretreatment: density 0.5 kg / ^{m 3} the water content of 8% -18% of the wood board not exceeding processes below thickness 2 cm,

b. Heat treatment: pretreated three contacting the wood board was placed, respectively the density of three wooden board ^{0.46kg / m 3, 0.39kg / m} 3, a 0.43 kg / ^{m 3,} wooden board The moisture content of the wood is controlled to 9%, 11%, 13%, and the thickness is controlled to 0.6 cm, 0.8 cm, and 0.4 cm, respectively, and the pretreated wood board is heated to a high frequency of 100 ° C. and heated. The time is 3 min.

c. Pressurization treatment: The heat-treated wood board is compressed with a preset compression rate S, the preset compression rate is 10%, the thickness of N wooden boards in contact with each other is U1, and the thickness after pressurization. If it is U2, then P = U2 / U1.

d. Hardening treatment: Under the condition that the preset compression ratio does not change, the pressure-treated wood board is heated to 240 ° C. at a high frequency and kept warm for 5 minutes.

e. Temperature lowering treatment: Pressurized wooden boards are forcibly cooled for a certain period of time under low temperature conditions.

f. Curing treatment: The temperature-decreased wooden board is left at room temperature for 12 days to obtain a composite uneven board by high frequency.

Here, the raw materials for producing the wooden board are selected from poplar, Shinanoki and Radiata pine, respectively.

Example 5 of the cooling process step is as follows.

Among them, the total thickness of the three pressurized wooden boards in step c is 0.9 dm, and the upper and lower surfaces of the pretreated wooden boards are covered with an electrically insulating cloth.
(Example 1)

The press working effect test of the uneven plate material is as follows.

The uneven environment protection type door plate produced by Example 1-7, Control Example 1-11 and Chinese patent CN107901178A was set as a test 1-7 set, a control 1-11 set and a positive 1 set, and the uneven effect of the uneven plate material of each set. The results are averaged using 5 parallel samples in each set as an example, and the results of consideration are shown in Table 5.

Table 5: Press working effect of uneven plate material of each group

As can be seen from Table 5, the moisture content, thickness, density, heating time, and heating temperature of the wooden board all significantly affect the press processing effect of the uneven board material, and the moisture content of the wood is 8-18% and the thickness. As long as it is controlled within 2 cm, density 0.5 kg / m ³ or less, heating time 2-3 min, heating temperature 80 ° C-100 ° C, the uneven plate material has clear grain, uniform density, and cracks and expansion phenomena. It can be made so that it does not exist. If the heating temperature and time continue to rise, the input and the output are not proportional, and the uneven plate material produced by the method of the present invention has unevenness that does not match, has specificity, and has unevenness on one side. it can be produced an uneven sheet having uneven on both sides (shown in FIG. 1) (FIG. 2).
(Example 2)

The consideration of the deformation recovery rate is as follows.

The concavo-convex plate material produced by the method for producing the surface concavo-convex decorative plate material produced in Example 3-5, Control Example 12-15 and Chinese patent CN101195291B was used as an experiment 8-10 set, a control 12-15 group and a positive 2 group. The thickness before compression and after the completion of production and the thickness after leaving for 30 days after the completion of production of each set of uneven plate materials are considered, the deformation recovery rate R is calculated, and the results are shown in Table 6.

R = Tr-Tc / T ₀ -Tc, where Tr is the thickness of the uneven plate material after being left for 30 days, Tc is the thickness of the uneven plate material after compression, and T ₀ is the thickness of the uneven plate material before compression. It is the thickness of the uneven plate material.

Table 6: Deformation recovery rate consideration results

As can be seen from Table 6, the temperature lowering method significantly affects the deformation recovery rate of the uneven plate material, and the temperature lowering treatment method and curing time provided in the present invention significantly reduce the deformation recovery rate of the uneven plate material. When the parameters of the temperature lowering treatment are changed or the curing time is short, the deformation recovery rate of the uneven plate material is remarkably improved, and the deformation recovery rate of the uneven plate material produced in the present invention is positive for two sets. It is significantly lower than the uneven plate material.
(Test Example 3)

The consideration of the performance index is as follows.

The concavo-convex plate material produced by the method for producing the surface concavo-convex decorative plate material produced in Example 5-7 and the Chinese patent CN101195291B was set as test 11-13 sets and positive 3 sets, and the performance index of each set of concavo-convex plate material was considered. The results are shown in Table 7.

Table 7: Consideration of each parameter of high temperature and decompression treatment

As can be seen from Table 7, the preset compression ratio is closely related to the density. The compression ratio is set by the method provided by the present invention, and each performance index of the produced uneven plate material is good, and the preset compression ratio and the density do not match (the compression ratio is set by the method provided by the present invention). If not), each performance index of the concavo-convex plate material is significantly lowered, and the concavo-convex plate material produced by the present invention has better specific gravity and other indexes than the concavo-convex plate material produced by using the template.
(Test Example 4)

The charring test is as follows.

The concavo-convex plate materials produced by the methods of Example 8 and Control Example 16-18 were set as 14 sets of test and 16-18 sets of control, and the degree of charring on both the front and back surfaces of the concavo-convex plate material of each set was considered, and the results are shown in Table 8. Shown.

Burning degree (%) = Burning area on both the front and back sides of the uneven plate material / Surface area on both the front and back sides of the uneven plate material.

Table 8: Results of charring test

As can be seen from Table 8, when the thickness of the pressure-treated wood board is 1 cm or less, it is necessary to cover the upper surface or the lower surface of the pre-treated wood board with an electrically insulating cloth, and the heat compression treatment and the temperature rise compression treatment are performed. In the process of, the high frequency ratio of the intermediate region to the high frequency ratio of the surrounding region is 1: 0.88-0.94, and in the curing process, the ratio of the high frequency of the intermediate region to the high frequency of the surrounding region is 1: 0. It is .93-0.96, otherwise it may burn or damage the equipment.
(Test Example 5)

Concavo-convex board materials were prepared by the methods of Examples 4-5 and Control Example 16, the tensile force used to separate the two adjacent wooden boards was calculated, and the results are shown in Table 9.

Table 9: Test results of separation tensile force after press working of uneven plate material of each group

As can be seen from Table 9, by limiting the surface frictional force of the wooden board, the tensile force used to separate the two wooden boards after press working can be significantly reduced, and the surface frictional force of the wooden board exceeds 2.5 μm. And, a relatively large tensile force is required to separate the two wooden boards.

Claims (9)

a. Pretreatment: Select a wooden board with a density of 0.5 kg / m ³ or less, control the moisture content of the wooden board to 8-18%, and control the thickness within 2 cm.
b. Heat treatment: N pretreated wood boards are selected and put into contact with each other, N ≧ 2, and the pretreated wood boards are heated to a wood board temperature of 60 ° C-80 ° C at a high frequency and kept warm for 2-3 minutes.
c. Pressurization: The heat-treated wood board is compressed with a preset compression rate S, the preset compression rate is set to 10% -70%, and the thickness of contact of N wood boards is defined by U1. And the thickness after pressurization is U2, S = U2 / U1,
d. Hardening treatment: The pressure-treated wood board is heated to 200-240 ° C. at a high frequency under the condition that the preset compression ratio does not change, and the wood board is kept warm for 4-6 minutes.
e. Temperature lowering treatment: The pressure-treated wooden board is subjected to the temperature lowering treatment under the condition that the preset compression ratio does not change, and specifically, the wooden board surface cured by the water cooling technology is subjected to the wooden board at a rate of 5-15 ° C./min. Cooling to an average temperature of 70-90 ° C, the water flow velocity of the water cooling technology is 4.5-5 m / s, and when cooling to a wooden board surface temperature of 120-130 ° C, wind cooling is performed and the wind speed is 9.2-9. .7 m / s, the wind temperature is 55-60 ° C, and the angle between the wind direction and the upper and lower surfaces of the wooden board is 55-58 °.
f. Curing treatment: The temperature-decreased wooden board is left at room temperature for 8 to 10 days to obtain a composite uneven board material by high frequency.
A method for producing a composite concavo-convex plate material by high frequency, characterized in that the upper surface and / or the lower surface is concavo-convex . Step a The method for producing a composite concavo-convex board material by high frequency according to claim 1, wherein the surface roughness of the pretreated wooden board does not exceed 2.5 μm. In the heat treatment process, the intermediate region and the surrounding region of the wood are heated at high frequencies, and the high frequency ratio of the intermediate region to the surrounding region is 1: 0.88-0.94. In the curing treatment, the heat compression treatment is performed. The first aspect of claim 1, wherein the intermediate region and the surrounding region of the wood are heated at high frequencies, respectively, and the high frequency ratio of the intermediate region to the high frequency ratio of the surrounding region is 1: 0.93 to 0.96. Method of manufacturing composite uneven plate material by high frequency. The method for producing a composite concavo-convex board material by high frequency according to claim 1, wherein in step b, the density difference between any two of the N wooden boards does not exceed 0.15 kg / m ³ . In the pretreatment of step a, the compression directions of the wooden boards are set to three, including the contact of the wooden boards by overlapping them in the horizontal direction, the contact by arranging them in the vertical direction, and the arbitrary combination of the two. The method for producing a composite concavo-convex board material by high frequency according to claim 1, wherein at least two wooden boards are prepared in each compression direction. When the wood boards are overlapped and brought into contact with each other, the compressibility of the wood boards processed at high pressure and high temperature is P, and each wood

The method for manufacturing a composite concavo-convex plate material by high frequency according to claim 5, wherein the condition is satisfied. The composite unevenness due to high frequency according to claim 1, wherein the upper surface or the lower surface of the pretreated wooden board is coated with an electrically insulating cloth when the thickness of the pressure-treated wooden board in step c is 1 cm or less. Manufacturing method of plate material. The method for producing a composite uneven plate material by high frequency according to claim 1, wherein the deformation recovery rate after leaving the composite uneven plate material for 14 days is less than 0.5%, and the bending strength is 80 to 100 MPa. The method for producing a composite concavo-convex plate material by high frequency according to claim 1, wherein the unevenness depth of the composite concavo-convex plate material is 400-10000 μm.

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