阅读说明：本技术 一种用于提高实木板材尺寸稳定性的方法 (Method for improving dimensional stability of solid wood board ) 是由 佘学彬 沈小笛 莫德旺 杨亮庆 谢杰 仲利涛 于 2019-08-27 设计创作，主要内容包括：本发明公开了一种用于提高实木板材尺寸稳定性的方法,其包括对实木板材进行如下处理：1)压干处理：在90℃-160℃的条件下对所述实木板材施加0.1MPa-1.0MPa的压力持续1-10h,使压干处理后的实木板材的含水率达到0.5％-3.5％,其中,在对所述实木板材施加压力的过程中每隔5-60min泄压排气5-15s；2)回潮处理：对所述压干处理后的实木板材进行回潮处理,使回潮处理后的实木板材的含水率达到5％-12％；3)平衡处理：对所述回潮处理后的实木板材进行平衡处理,使平衡处理后的实木板材的含水率达到8％-10％。通过本发明的方法对实木板材进行处理,提高了实木板材的尺寸稳定性,能有效的解决实木板材的起拱、翘曲和变形等问题。(The invention discloses a method for improving the dimensional stability of a solid wood board, which comprises the following steps of: 1) pressing and drying: applying pressure of 0.1-1.0 MPa to the solid wood board at the temperature of 90-160 ℃ for 1-10h to enable the water content of the solid wood board subjected to the press drying treatment to reach 0.5-3.5%, wherein pressure is released and exhausted for 5-15s every 5-60min in the process of applying pressure to the solid wood board; 2) moisture regain treatment: carrying out moisture regain treatment on the pressed and dried solid wood board to enable the moisture content of the moisture regain treated solid wood board to reach 5% -12%; 3) and (3) balance treatment: and carrying out balance treatment on the solid wood board after the moisture regaining treatment to enable the water content of the solid wood board after the balance treatment to reach 8% -10%. The method of the invention is used for processing the solid wood board, improves the dimensional stability of the solid wood board, and can effectively solve the problems of arching, warping, deformation and the like of the solid wood board.)

1. A method for improving dimensional stability of a solid wood panel, comprising subjecting the solid wood panel to:

1) pressing and drying: applying pressure of 0.1-1.0 MPa to the solid wood board at the temperature of 90-160 ℃ for 1-10h to enable the water content of the solid wood board subjected to the press drying treatment to reach 0.5-3.5%, wherein pressure is released and exhausted for 5-15s every 5-60min in the process of applying pressure to the solid wood board;

2) moisture regain treatment: carrying out moisture regain treatment on the pressed and dried solid wood board to enable the moisture content of the moisture regain treated solid wood board to reach 5% -12%;

3) and (3) balance treatment: and carrying out balance treatment on the solid wood board after the moisture regaining treatment to enable the water content of the solid wood board after the balance treatment to reach 8% -10%.

2. The method of claim 1, wherein the moisture content of the solid wood panel after the moisture regain process to 5% to 12% comprises: and (3) applying steam to the pressed and dried solid wood board at the temperature of 30-75 ℃, wherein the application amount of the steam is 1.5-6.0 kg/min.

3. The method of claim 2, wherein said applying steam comprises applying steam to each surface of said press-dried solid wood panel sequentially for 20-90 minutes each, and wherein said applying steam is repeated one or more times.

4. The method of claim 3, wherein the steam is maintained in circulation during the applying the steam using a blower.

5. The method of claim 4, wherein the moisture regain treatment further comprises maintaining the steamed solid wood panel at a temperature of 30 ℃ to 75 ℃ and a relative humidity of 30% to 90% for 4 to 10 days after the steam application.

6. The method of claim 1, wherein the balancing the water content of the balanced solid wood panel to 8% -10% comprises: and standing the solid wood board subjected to the moisture regaining treatment in a balance room with the temperature of 20-40 ℃ and the water content of 5-12% for 5-30 days.

7. The method of claim 1, wherein the drying process is performed in a heated press and the conditioning process is performed in a closed conditioning kiln.

8. The method of claim 1, wherein the solid wood panel is selected from the group consisting of: papaya longan wood species, kayage wood species, carob bean wood species, balsam pea wood species, pear wood species, white oak species, and birch wood species.

9. A solid wood panel obtained after treatment by the method of any one of claims 1 to 8.

Technical Field

The invention relates to the field of solid wood floors, in particular to a method for improving the dimensional stability of a solid wood board and the solid wood board treated by the method.

Background

The solid wood floor has the texture of natural growth of wood, is a poor heat conductor, has the characteristics of being warm in winter and cool in summer, comfortable in foot feeling, safe to use and the like, and becomes an ideal material for ground decoration of bedrooms, living rooms, study rooms and the like. Nowadays, with the improvement of the life of people and the continuous support of national policies, more and more people select solid wood floors when paving the floors. However, the wooden floor has a high paving requirement, and if the paving is not good, a series of problems such as noise are generated. Meanwhile, if the indoor environment is too humid or dry, the problems of arching, warping, deformation and the like of the solid wood floor are easy to occur. Therefore, how to improve the dimensional stability of the solid wood flooring to reduce the arching, warping and deformation of the solid wood flooring caused by environmental changes is a problem to be solved in the art.

Disclosure of Invention

In order to solve the technical problems, the invention provides a method for improving the dimensional stability of a solid wood board.

The method for improving the dimensional stability of the solid wood board comprises the following steps of: 1) pressing and drying: applying pressure of 0.1-1.0 MPa to the solid wood board at the temperature of 90-160 ℃ for 1-10h to enable the water content of the solid wood board subjected to the press drying treatment to reach 0.5-3.5%, wherein pressure is released and exhausted for 5-15s every 5-60min in the process of applying pressure to the solid wood board; 2) moisture regain treatment: carrying out moisture regain treatment on the pressed and dried solid wood board to enable the moisture content of the moisture regain treated solid wood board to reach 5% -12%; 3) and (3) balance treatment: and carrying out balance treatment on the solid wood board after the moisture regaining treatment to enable the water content of the solid wood board after the balance treatment to reach 8% -10%.

In some embodiments of the present invention, the bringing the moisture content of the solid wood panel after the moisture regain treatment to 5% to 12% in the moisture regain treatment includes: and (3) applying steam to the pressed and dried solid wood board at the temperature of 30-75 ℃, wherein the application amount of the steam is 1.5-6.0 kg/min.

In some embodiments of the invention, the applying steam comprises sequentially applying steam to each surface of the press-dried solid wood panel for each 20-90min, and the applying of steam is repeated one or more times.

In some embodiments of the invention, a fan is used to keep the steam in circulation during the application of the steam.

In some embodiments of the invention, the moisture regain treatment further comprises maintaining the steamed solid wood panel at a temperature of 30 ℃ to 75 ℃ and a relative humidity of 30% to 90% for a period of 4 to 10 days after the steam application.

In some embodiments of the present invention, the balancing the water content of the balanced solid wood panel to 8% to 10% in the balancing process comprises: and standing the solid wood board subjected to the moisture regaining treatment in a balance room with the temperature of 20-40 ℃ and the water content of 5-12% for 5-30 days.

In some embodiments of the invention, the press drying process is performed in a hot press and the conditioning process is performed in a closed conditioning kiln.

In some embodiments of the invention, the solid wood panel is selected from the group consisting of: papaya longan wood species, kayage wood species, carob bean wood species, balsam pea wood species, pear wood species, white oak species, and birch wood species.

In some embodiments of the invention, the method further comprises, prior to the press-drying process, loading the solid wood board material onto a loader, pushing the solid wood board material into the hot press by the loader, the solid wood board material having a moisture content of 7% to 15% and a density of 0.4g/cm³-0.9g/cm³。

The invention also provides a solid wood board obtained after the solid wood board is treated by the method.

The method for improving the dimensional stability of the solid wood board comprises three stages of press drying treatment, moisture regaining treatment and balancing treatment. The absorbed water in the solid wood board is extruded out through the press-drying treatment, cells of the solid wood board are changed into an oval shape from a round shape, and the structure tends to be stable; through the moisture regain treatment after the press drying treatment, the water content of the solid wood board is adjusted to 5% -12%, and the size change caused by the water content of the solid wood board when the use environment is different is reduced; through the balance treatment after the moisture regain treatment, the water content of the solid wood board is adjusted to 8% -10%, the size change of the solid wood board when the use environment is different is further reduced, and the internal stress of the solid wood board is reduced. The method of the invention is adopted to process the solid wood board, improves the dimensional stability of the solid wood board, and can effectively solve the problems of arching, warping, deformation and the like of the solid wood board.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the following detailed description of various aspects of the present invention is provided with specific examples, which are only used for illustrating the present invention and do not limit the scope and spirit of the present invention.

In this embodiment, the method for improving the dimensional stability of the solid wood board according to the present invention is illustrated by using the seed of the carica papaya as an exemplary solid wood board, wherein the water content of the carica papaya solid wood board is 7% to 15%, the end of the board has no crack, and the density of the board is 0.4g/cm³-0.9g/cm³. Before the processing of the real wood plates of the senna, the real wood plates of the senna are firstly pushed into a 20-layer hot press by a 20-layer loading machine with the length of 2.7m and the width of 1.3 m. And then, processing the sheet material of the real wood of the senna, wherein the processing method comprises three steps of pressing dry processing, moisture regain processing and balance processing. The method comprises the following specific steps:

(1) carrying out press-drying treatment on the sheet material of the senna longan in a hot press: after the senna fruit wood board is pushed into a hot press, the temperature of the hot press is controlled to be 90-160 ℃, the pressure of 0.1-1.0 MPa is applied to the senna fruit wood board for 1-10 hours under the temperature condition of 90-160 ℃, the water content of the senna fruit wood board reaches 0.5-3.5%, and the pressure is released and exhausted for 5-15s every 5-60min in the process of applying the pressure to the senna fruit wood board. The temperature of the pressing plate of the hot press is kept consistent, so that the senna fruit wood plate directly contacted with the pressing plate is heated more uniformly, and the pressing plate for separating the senna fruit wood plates is opened for 5-15s by pressure relief every 5-60min, which is beneficial to the exhaust of the senna fruit wood plate. The water content of the dried papaya tree plate is 0.5-3.5% by extruding the absorbed water in the papaya tree plate through drying treatment, the papaya tree plate cells are changed from round to oval, and the papaya tree plate structure tends to be stable.

(2) Carrying out moisture regain treatment on the pressed dry senna solid wood board in a closed moisture regain cellar: putting the dried senna fruit wood plate into a closed moisture-regaining cellar, controlling the temperature in the closed moisture-regaining cellar to be 30-75 ℃, applying steam to the dried senna fruit wood plate, wherein the application amount of the steam is 1.5-6.0kg/min, the application of the steam comprises the steps of sequentially applying the steam to each surface of the dried senna fruit wood plate for 20-90min, and the application of the steam is repeated once. During the above-described application of steam, a fan is used to keep the steam in circulation. After the steam is applied, the dried senna longan solid wood plate is kept at the temperature of 30-75 ℃ and the relative humidity of 30-90% and is kept standing in a moisture regaining cellar for 4-10 days, so that the water content of the senna longan solid wood plate reaches 5-12%. Through the moisture regain treatment after the pressing treatment, the water content of the papaya tree wood plate is adjusted to be 5% -12%, and the size change caused by the water content of the papaya tree wood plate when the use environment is different is reduced. Meanwhile, due to the fact that the moisture regain treatment is carried out in the closed moisture regain cellar, steam is applied in the closed moisture regain cellar, the moisture content of the senna longan solid wood board with low moisture content after the pressing and drying treatment can be quickly returned to the state suitable for the south and north environments, and the method is simple and efficient.

(3) Carrying out balance treatment on the dried papaya longan solid wood plate in a balance room: placing the dried papaya longan solid wood plate into a balance room, controlling the temperature in the balance room to be 20-40 ℃ and the water content to be 5-12%, and standing the dried papaya longan solid wood plate in the balance room for 5-30 days to enable the water content of the papaya longan solid wood plate to reach 8-10%. Through the balance treatment after the moisture regain treatment, the water content of the papaya tree plate is adjusted to 8% -10%, the size change of the papaya tree plate when the use environment is different is further reduced, and the internal stress of the papaya tree plate is reduced. By balancing the water content of the solid wood plate of the senna, the water content of the solid wood plate of the senna is deviated to 8-10% of the balanced water content in the same environment, so that the problems of arching, warping, deformation and the like caused by different use environments are reduced, and the dimensional stability of the solid wood plate of the senna is improved.

The dimensional stability of the papaya longan solid wood board obtained by the processing of the method is determined by adopting a method in LY/T1700-2007 wooden floor for floor heating, and the result shows that the papaya longan solid wood board has heat-resistant dimensional stability in the width direction of less than or equal to 0.89%, moisture-resistant dimensional stability in the width direction of less than or equal to 0.45%, heat-resistant dimensional stability in the length direction of less than or equal to 0.11%, moisture-resistant dimensional stability in the length direction of less than or equal to 0.01%, and meets the national standard requirements (national standard requires that heat-resistant dimensional stability in the width direction of less than or equal to 1.5%, moisture-resistant dimensional stability of less than or equal to 0.8%, heat-resistant dimensional stability in the length direction of less than or equal to 0.2%, moisture-resistant dimensional stability of less than or equal to 0.2%, see technical requirements and paving. The dimensional stability test is also carried out on the processed sheet material of the carica papaya Linn, and the result shows that the heat-resistant dimensional stability in the width direction is less than or equal to 1.3 percent, the moisture-resistant dimensional stability in the width direction is less than or equal to 0.7 percent, the heat-resistant dimensional stability in the length direction is less than or equal to 0.16 percent, and the moisture-resistant dimensional stability in the length direction is less than or equal to 0.08 percent.

According to the heat-resistant dimensional stability data and the moisture-resistant dimensional stability data, the dimensional stability of the processed senna longan solid wood board meets the national standard, and the dimensional stability of the processed senna longan solid wood board is integrally improved by 20-40% compared with the dimensional stability of the processed senna longan solid wood board.

The present invention has been described in conjunction with specific embodiments which are intended to be exemplary only and are not intended to limit the scope of the invention, which is to be given the full breadth of the appended claims and any and all modifications, variations or alterations that may occur to those skilled in the art without departing from the spirit of the invention. Therefore, various equivalent changes made according to the present invention still fall within the scope covered by the present invention.