A kind of agarwood compressed wood based on high frequency

Abstract

The present invention provides a agarwood compacted wood based on high frequency. The agarwood compacted wood includes compacted wood and a number of agarwoods embedded in the compacted wood. The preparation method of the agarwood compacted wood comprises the following steps: S1 Pre-compression: Select wood and compress the wood through a hot press to obtain prefabricated compacted wood; S2 Press-in: Select agarwood and place it on the upper surface of the prefabricated compacted wood obtained in step S1, and compress the prefabricated compacted wood through a hot press to obtain preliminarily compressed compacted wood; S3 Compaction: Heat the preliminarily compressed compacted wood with high frequency, then perform a pressing treatment on the preliminarily compressed compacted wood, and then heat and cure the preliminarily compressed compacted wood with high frequency. Treat the preliminarily compressed compacted wood with air-cooling technology. When the surface temperature of the treated preliminarily compressed compacted wood is lower than 40°C, the agarwood compacted wood is obtained. For the agarwood compacted wood based on high frequency, the agarwood can be firmly embedded in the wood, endowing the wood with the properties of agarwood, and it can be used for the production of indoor furniture.

Description

Technical Field

[0001] The present invention belongs to the technical field of wood lamination, and particularly relates to agarwood compacted wood based on high frequency. Background Art

[0002] Agarwood is a kind of arbor belonging to the family Thymelaeaceae and the genus Aquilaria, with a height of 5-15 meters. Its bark is dark gray, almost smooth, and the fibers are tough. The small branches are cylindrical. It is produced in Guangdong, Hainan, Guangxi, Fujian and other places in China. It likes to grow in low-altitude mountains, hills and woods on sunny roadside. It is often made into stick incense, coil incense, incense powder, Buddhist beads, pendants, accessories, ornaments, etc. The resin accumulated after the old stem of agarwood is injured is called agarwood, which can be used as a raw material for spices and for treating stomach diseases. In addition to its medicinal efficacy, agarwood also has the effects of calming the mind, refining essence, and removing freckles. The price of agarwood is often made into bracelets or carved into ornaments, etc. Summary of the Invention

[0003] In order to expand the scope of use of agarwood, the present invention provides agarwood compacted wood based on high frequency.

[0004] The specific technical solution of the present invention is as follows:

[0005] The present invention provides agarwood compacted wood based on high frequency. The agarwood compacted wood includes compacted wood and several pieces of agarwood embedded in the compacted wood. The preparation method of the agarwood compacted wood includes the following steps:

[0006] S1 Pre-pressing step: Select wood, compress the wood through a hot press, with a compression ratio of 20%-30%, the pressure applied by the hot press to the wood is 3MPa-5MPa, and the pressure holding time is 30s-600s to obtain pre-pressed wood;

[0007] S2 Pressing-in step: Select agarwood, place it on the upper surface of the pre-pressed wood obtained in step S1, and compress the pre-pressed wood with agarwood through a hot press, with a compression ratio of 30%-40% and a pressure holding time of 20-50s to obtain preliminarily compressed and compacted wood;

[0008] S3 Compaction Step: First, heat the preliminarily compressed and densified wood with high-frequency waves until the surface temperature of the preliminarily compressed and densified wood reaches 80°C - 100°C, then keep it warm for 1 min - 2 min. Secondly, apply pressure to the preliminarily compressed and densified wood after heat preservation, with a compression rate of over 80% and a pressure-holding time of 1 - 2 min. Thirdly, heat and cure the preliminarily compressed and densified wood after pressure holding with high-frequency waves. The surface temperature of the preliminarily compressed and densified wood after heat curing is 180°C - 200°C, and the curing heat preservation time is 2 min - 3 min. Finally, treat the preliminarily compressed and densified wood after curing heat preservation with air-cooling technology. The surface temperature of the preliminarily compressed and densified wood after air-cooling technology treatment is below 40°C, the temperature of the air is 10°C - 15°C, and the wind speed is 20 m / s - 25 m / s, thus obtaining the agarwood compacted wood.

[0009] Among them, in the above three steps of prefabrication, pressing-in, and compaction, the compression rate is calculated based on the entire thickness of the wood. The wood can be agarwood or other qualified woods. Both the agarwood and agarwood wood used in the present invention can be artificially planted or wild as long as they meet the requirements of "LY / T 2904 - 2017 Agarwood". That is, agarwood is a natural mixture composed of xylem tissue and its secretions formed during the growth process of agarwood tree species, and agarwood wood is the xylem tissue of agarwood tree species. Before pressing, the wood needs to be trimmed to make the two cut surfaces parallel and contact the upper and lower pressing plates of the hot press respectively, which is convenient for the hot press to clamp. Before pressing the agarwood into the wood, it can also be cut into a specified shape. The calculation formula for the compression rate P is as follows:

[0010] P = (D2 - D1) / D2 * 100%;

[0011] Among them, D2 is the thickness of the wood before compression, and D1 is the thickness of the wood after compression;

[0012] High-frequency wave means high-frequency wave, which refers to an electromagnetic wave with a frequency greater than 100 KHz. "Based on high-frequency wave technology" means using a high-frequency hot press to laminate the wood. First, place the wood between the upper and lower pressing plates and pre-press it through the hot pressing plates. Then, place the agarwood on the prefabricated compressed wood, heat it with high-frequency waves, apply pressure, press the agarwood into the wood, and then re-compact the wood with agarwood embedded using high-frequency waves. The parameters in each step are closely coordinated to firmly embed the agarwood in the wood.

[0013] Furthermore, in step S2, first heat the pre-pressed wood with agarwood placed on it with high-frequency waves and then compress it. The surface temperature of the pre-pressed wood after heating is 60°C - 80°C; in step S2, the surface temperature of the agarwood is 20 - 25°C.

[0014] Further, the moisture content of the pre-pressed wood is 5%-8% higher than that of the agarwood.

[0015] Further, the density of the pre-pressed wood is 0.4-0.6 g / cm 3 , and the density of the agarwood is not less than 0.8 g / cm 3 .

[0016] Further, the agarwood is also processed as follows: the agarwood is placed in ethanol and soaked until there is no secretion on the surface, and then taken out and placed in a cool place to air dry.

[0017] Further, the concentration of ethanol is not less than 85%.

[0018] Through research, when the compacted wood embedded with agarwood is in a state of high temperature and high humidity, etc., the different thermodynamic properties of the two may cause the separation of the agarwood and the compacted wood. In the present invention, by treating the agarwood with ethanol, while retaining most of its secretions, the secretions on its surface are removed, making its surface in a woody state. At the same time, by limiting the temperature, density and moisture content of the agarwood and the compacted wood, the firmness of its embedding with the wood can be significantly improved, that is, the adhesion of the agarwood on the compacted wood is improved.

[0019] Further, a thermoplastic resin film is provided between the agarwood and the pre-pressed wood.

[0020] Among them, the thermoplastic resin film includes a PVB interlayer film and other resin films with similar effects.

[0021] Further, the agarwood is also processed as follows: the thermoplastic resin film is wrapped around the outer sidewall of the agarwood.

[0022] Among them, the thermoplastic resin film can be wrapped around the outer sidewall of the agarwood by heating the thermoplastic resin film to a molten state, and then placing the agarwood in the molten thermoplastic resin film and stirring until the outer sidewall of the agarwood is covered with the molten thermoplastic resin film; in the present invention, by wrapping the thermoplastic resin film around the outer sidewall of the agarwood, its connection with the wood is made more firm, and at the same time, the volatilization of the agarwood secretions can be reduced before use. When in use, by rubbing the outer surface of the agarwood with sandpaper until the agarwood is exposed, the agarwood can continue to volatilize secretions.

[0023] Further, after the preliminary compression of the compacted wood is processed by the air-cooling technology, a curing step is also carried out, that is: Step S4 Curing step: The preliminary compression of the compacted wood is balanced at room temperature, and the balance time is not less than 3 days.

[0024] The agarwood compacted wood based on high frequency provided by the present invention can firmly embed the agarwood in the wood, making the wood have the properties of agarwood, and can be used for the production of indoor furniture. Description of the Drawings

[0025] Figure 1 Flow chart of agarwood embedded in aquilaria wood

[0026] Figure 2 Physical diagram of aquilaria wood

[0027] Among them, 1 - agarwood, 2 - aquilaria wood Specific implementation mode

[0028] Examples 1 - 3 and comparative examples 1 - 6

[0029] Examples 1 - 3 provide agarwood - compressed wood based on high - frequency current, with agarwood embedded in the compressed wood. As Figure 1 shown, the preparation method is as follows

[0030] S1 Pre - pressing step: Select wood and compress the wood through a hot press. The compression ratio is 20% - 30%, the pressure applied by the hot press to the wood is 3 MPa - 5 MPa, and the pressure - holding time is 30 s - 600 s to obtain pre - pressed wood

[0031] S2 Press - in step: Select agarwood and place it on the upper surface of the pre - pressed wood obtained in step S1. Compress the pre - pressed wood with agarwood through a hot press. The compression ratio is 30 - 40%, and the pressure - holding time is 20 - 50 s to obtain preliminarily compressed and densified wood

[0032] S3 Compacting step: Heat the preliminarily compressed and densified wood with high - frequency current. After heating, the surface temperature of the preliminarily compressed and densified wood is 80°C - 100°C, and keep it warm for 1 min - 2 min. Then, perform pressure - applying treatment on the preliminarily compressed and densified wood. The compression ratio is more than 80%, and the pressure - holding time is 1 - 2 min. Then, heat and cure the preliminarily compressed and densified wood with high - frequency current. After heating and curing, the surface temperature of the preliminarily compressed and densified wood is 180°C - 200°C, and the curing and heat - preservation time is 2 min - 3 min. Treat the preliminarily compressed and densified wood with air - cooling technology. After treatment, the surface temperature of the preliminarily compressed and densified wood is lower than 40°C, the temperature of the air is 10°C - 15°C, and the wind speed is 20 m / s - 25 m / s, thus obtaining agarwood - compressed wood

[0033] The preparation parameters of the agarwood - compressed wood based on high - frequency current in Examples 1 - 3 are shown in Table 1

[0034] The preparation method of the agarwood - compressed wood in Comparative Examples 1 - 6 also includes at least one step of Examples 1 - 3, but the parameters are changed. The preparation parameters of Comparative Examples 1 - 6 are shown in Table 1

[0035] All the agarwood used in the examples of the present invention is artificially cultivated agarwood. The ethanol extract of agarwood is 10.8%, and the size is 2 cm * 2 cm * 1 cm

[0036] Table 1. Preparation parameters of agarwood compacted wood in Examples 1-3 and Comparative Examples 1-6.

[0037]

[0038]

[0039]

[0040] Examples 4-5 and Comparative Examples 7-8

[0041] Examples 4-5 provide high-frequency-based agarwood compacted wood with agarwood embedded in the compacted wood. The preparation method is as follows:

[0042] S1 Pre-pressing step: Select wood and compress the wood through a hot press. The compression ratio is 20%-30%, the pressure applied by the hot press to the wood is 3 MPa - 5 MPa, and the pressure holding time is 30 s - 600 s to obtain pre-pressed wood;

[0043] S2 Pressing-in step: Select agarwood and place it on the upper surface of the pre-pressed wood obtained in step S1. Compress the pre-pressed wood through a hot press. The compression ratio is 30 - 40%, and the pressure holding time is 20 - 50 s to obtain preliminarily compressed compacted wood;

[0044] S3 Compacting step: Heat the preliminarily compressed compacted wood with high frequency. After heating, the surface temperature of the preliminarily compressed compacted wood is 80°C - 100°C, and the heat preservation time is 1 min - 2 min. Then, perform a pressure treatment on the preliminarily compressed compacted wood. The compression ratio is more than 80%, and the pressure holding time is 1 - 2 min. Then, heat and cure the preliminarily compressed compacted wood with high frequency. After heat curing, the surface temperature of the preliminarily compressed compacted wood is 180°C - 200°C, and the curing heat preservation time is 2 min - 3 min. Treat the preliminarily compressed compacted wood with air-cooling technology. After treatment, the surface temperature of the preliminarily compressed compacted wood is lower than 40°C, the temperature of the air is 10°C - 15°C, and the wind speed is 20 m / s - 25 m / s, thus obtaining agarwood compacted wood;

[0045] Among them, the agarwood in step S2 is also subjected to the following treatment: Place the agarwood in ethanol and soak it until there is no secretion on the surface, then take it out and place it in a cool place to air dry;

[0046] Among them, the concentration of ethanol is not less than 85%;

[0047] The preparation parameters of the high-frequency-based agarwood compacted wood in Examples 4-5 are shown in Table 2;

[0048] The preparation method of the agarwood compacted wood in Comparative Examples 7-8 also includes at least one step in Examples 4-5, but the parameters are changed. The preparation parameters of Comparative Examples 7-8 are shown in Table 2;

[0049] Table 2. Preparation parameters of agarwood compacted wood in Examples 4-5 and Comparative Examples 7-9.

[0050]

[0051]

[0052]

[0053] Note: In Comparative Example 8, agarwood and wood were directly compacted, and agarwood was immersed in ethanol before compaction. The specific parameters are shown in Table 2. Balancing for 10 days means placing it at room temperature for 10 days.

[0054] Example 6

[0055] This example provides a kind of agarwood compacted wood based on high frequency. The difference between the preparation method of this agarwood compacted wood and that of Example 5 is that in the pressing step of step S2, a PVB intermediate film is set between the agarwood and the pre-pressed wood. The thickness of this PVB intermediate film is 0.76 mm, the viscosity is 18.5 Pa·s, the elastic modulus of the PVB intermediate film is 80×10 6 Pa, the size of the PVB intermediate film is 6 cm * 6 cm. Before pressing, the agarwood is placed on the PVB intermediate film. The PVB films of the present invention are all purchased from Shanghai Meibang Plastic Co., Ltd.

[0056] Example 7

[0057] This example provides a kind of agarwood compacted wood based on high frequency. The difference between the preparation method of this agarwood compacted wood and that of Example 5 is that before the agarwood is placed on the pre-pressed wood in the pressing step of step S2, the following treatment is also carried out: melting the PVB intermediate film into a liquid state, and placing the agarwood in the liquid PVB intermediate film and stirring until the outer side wall of the agarwood is covered with the liquid PVB intermediate film.

[0058] Test Example 1 Adhesion test of agarwood to agarwood in each group of agarwood compacted wood

[0059] Two agarwood compacted woods were prepared respectively by the methods of Examples 1-3 and Comparative Examples 1-6, which were Test Board 1 and Test Board 2 respectively. The AT-M Adhesion Tester (Diff's high-precision digital display pull-out adhesion measuring instrument, purchased from Gaozhi Precision Hardware Tools Franchise Store on JD.com) was used to measure the adhesion of agarwood on each group of agarwood compacted wood. The size of the spindle is 10 mm, and the test results are shown in Table 3.

[0060] Table 3. Test results of the adhesion of agarwood to agarwood on each group of agarwood compacted wood.

[0061]

[0062] As can be seen from Table 3, the method provided by the present invention is carried out step by step through pre-pressing, pressing-in, and compaction. The adhesion of the agarwood compacted wood obtained is large, and the adhesion between the agarwood and the compacted wood is even greater. In Comparative Example 1, pre-pressing was not carried out. In Comparative Example 2, the compression ratio and pressure holding time in the pressing-in step were different from those of the methods in Examples 1-3. In Comparative Example 3, the parameters of the compaction step were different from those of the compaction step of the present invention. In Comparative Example 4, only pre-pressing was carried out, but the parameters of the pressing-in and compaction were different from those of Examples 1-3. In Comparative Example 5, pre-pressing was not carried out, and the compaction step was also different from that of Examples 1-3. In Comparative Example 6, the pre-pressing and pressing-in steps were omitted, and the agarwood and the agarwood wood were directly subjected to the compaction step, resulting in a significant decrease in the adhesion of the obtained agarwood compacted wood and a significant decrease in the adhesion between the agarwood and the agarwood wood.

[0063] Test Example 2 Adhesion test of agarwood to agarwood in each group of agarwood compacted wood under high humidity conditions

[0064] Two agarwood compacted woods were prepared respectively by using the methods of Examples 1-7 and Comparative Examples 7-8, which were Test Plate 1 and Test Plate 2 respectively. They were placed in a closed chamber at a temperature of 85°C and a humidity of 85% for 10 days. After taking them out, the adhesion of the agarwood on the compacted wood in each group of agarwood compacted wood was measured at room temperature using an AT-M adhesion tester (Diff's high-precision digital display pull-out adhesion measuring instrument, purchased from the high-precision hardware tool specialty store of JD.com). The size of the spindle was 10 mm, and the test results are shown in Table 4.

[0065] Table 4. Test results of the adhesion of agarwood to agarwood on each group of agarwood compacted wood.

[0066]

[0067] The results of Examples 1-3 show that: under the adhesion conditions of high temperature and high humidity, the adhesion of the agarwood in the agarwood compacted wood decreased significantly, and the lowest reached an adhesion of 21.72 MPa.

[0068] The comparison results of Examples 4-5 and Examples 1-3 show that: on the basis of Examples 1-3, Examples 4-5 added agarwood alcohol treatment and limited the temperature, density, and moisture content of the agarwood and the pre-pressed wood before compression. The decrease in adhesion of Examples 4-5 under high temperature and high humidity conditions was smaller, and an adhesion of 33.31-35.84 MPa was retained.

[0069] The comparison results of Examples 4-5 and Comparative Example 7 show that: even if agarwood alcohol treatment is added, if the temperature of the agarwood and the pre-pressed wood before compression does not meet the limited range of Examples 4-5, the adhesion of the agarwood on the compacted wood will still decrease, and the lowest reaches an adhesion of 23.22 MPa.

[0070] The comparison results between Example 4-5 and Comparative Example 8 show that: only using the linalool treatment step while neglecting the pre-pressing and pressing-in steps will cause a significant decrease in the adhesion of agarwood to the compacted wood, with the lowest adhesion reaching 18.19 MPa.

[0071] From the comprehensive comparison between Example 4-5 and Comparative Examples 7-9, the linalool treatment, the limitations on the temperature, density, and moisture content of agarwood and pre-pressed wood before compression, as well as steps such as pre-pressing, pressing-in, and compaction, play a synergistic role in preventing the decrease in adhesion.

[0072] The comparison results between Example 6 and Example 4-5 show that: adding the PVB film makes the adhesion of agarwood to the compacted wood greater, with the maximum adhesion reaching 39.25 MPa;

[0073] The comparison results between Example 7 and Example 6 show that: melting the PVB film into a molten state and wrapping it on the surface of agarwood can further increase the adhesion of agarwood to the compacted wood, with the maximum adhesion reaching 42.38 MPa.

[0074] In summary, the above are only the preferred embodiments of the present invention, and do not limit the protection scope of the present invention. All equivalent changes and modifications made according to the scope of the present invention patent and the content of the specification are within the scope covered by the present invention patent.

Claims

1. An agarwood compacted wood based on high frequency, characterized in that, The agarwood-compacted wood includes compacted wood and a number of agarwoods embedded in the compacted wood. The preparation method of the agarwood-compacted wood comprises the following steps: S1 Pre-pressing step: Select wood and compress the wood through a hot press with a compression ratio of 20%-30%. The pressure applied by the hot press to the wood is 3 MPa - 5 MPa, and the pressure holding time is 30 s - 600 s to obtain pre-pressed wood. The density of the pre-pressed wood is 0.4 g / cm 3 - 0.6 g / cm 3 ; S2 Pressing step: Take agarwood and place it on the upper surface of the pre-pressed wood obtained in step S1. Compress the pre-pressed wood with the agarwood placed thereon by a hot press. The compression ratio is 30%-40%, and the pressure holding time is 20s-50s to obtain a preliminarily compressed and compacted wood. In step S2, the pre-pressed wood with the agarwood placed thereon is heated by high frequency first and then compressed. The surface temperature of the pre-pressed wood after heating is 60°C-80°C; the surface temperature of the agarwood before compression is 20°C-25°C; the following treatment is also carried out on the agarwood before compression: soak the agarwood in ethanol until there is no secretion on the surface, take it out and place it in a cool place to air dry; S3 Compacting step: First, heat the preliminarily compressed and compacted wood by high frequency. After heating to the surface temperature of the preliminarily compressed and compacted wood being 80°C-100°C, keep it warm for 1min-2min; secondly, carry out a pressing treatment on the preliminarily compressed and compacted wood after heat preservation. The compression ratio is more than 80%, and the pressure holding time is 1min-2min; thirdly, heat and cure the preliminarily compressed and compacted wood after pressure holding by high frequency. The surface temperature of the preliminarily compressed and compacted wood after heat curing is 180°C-200°C, and the curing and heat preservation time is 2min-3min. Finally, treat the preliminarily compressed and compacted wood after curing and heat preservation with an air-cooling technique. The surface temperature of the preliminarily compressed and compacted wood after the air-cooling technique treatment is lower than 40°C, the temperature of the air is 10°C-15°C, and the wind speed is 20m / s-25m / s, thus obtaining the agarwood-compacted wood.

2. The agarwood compacted wood based on high frequency as described in claim 1, characterized in that, In step S2, the pre-pressed wood with the agarwood placed thereon is heated by high frequency first and then compressed. The surface temperature of the pre-pressed wood after heating is 60°C or 80°C; the surface temperature of the agarwood before compression is 20°C or 25°C.

3. The agarwood compacted wood based on high frequency as described in claim 1, characterized in that The moisture content of the pre-pressed wood is 5%-8% higher than that of the agarwood.

4. The agarwood compacted wood based on high frequency as claimed in claim 1, wherein The density of the agarwood is not less than 0.8 g / cm 3 .

5. The high-frequency-based agarwood compacted wood according to claim 4, characterized in that, The concentration of the ethanol is not less than 85%.

6. The high-frequency-based agarwood compressed wood according to claim 1, wherein A thermoplastic resin film is arranged between the agarwood and the pre-pressed wood.

7. The high-frequency-based agarwood compressed wood according to claim 1, wherein The following treatment is also carried out on the agarwood: wrap the thermoplastic resin film around the outer side wall of the agarwood.

8. The high-frequency-based agarwood compressed wood according to claim 1, characterized in that, After treating the preliminarily compressed and compacted wood with an air-cooling technique, a curing step is also carried out, that is: S4 Curing step: Balance the preliminarily compressed and compacted wood at normal temperature, and the balance time is not less than 3 days.

9. The high-frequency-based agarwood compacted wood according to claim 1, characterized in that, The preparation method of the agarwood-compacted wood comprises the following steps: S1 Pre-pressing step: Select wood, compress the wood through a hot press, with a compression ratio of 25%, the pressure applied by the hot press to the wood is 5 MPa, and the pressure holding time is 600 s, to obtain pre-pressed wood with a density of 0.6 g / cm 3 ; S2 Pressing-in Step: Select agarwood with a density of 0.9 g / cm 3 , a moisture content of 10%, and a surface temperature of 25°C, place it on the upper surface of the pre-pressed wood obtained in step S1, process the pre-pressed wood to a moisture content of 15% and a surface temperature of 80°C, and compress the pre-pressed wood with agarwood placed thereon through a hot press, with a compression ratio of 40% and a pressure holding time of 50 s to obtain preliminarily compressed and densified wood; S3 Compaction Step: Heat the preliminarily compressed and densified wood with high-frequency waves. After heating, the surface temperature of the preliminarily compressed and densified wood is 100 °C, and keep it warm for 2 minutes. Then, perform a pressure treatment on the preliminarily compressed and densified wood with a compression ratio of over 80% and a pressure holding time of 2 minutes. Next, heat and cure the preliminarily compressed and densified wood with high-frequency waves. After heating and curing, the surface temperature of the preliminarily compressed and densified wood is 200 °C, and the curing and heat preservation time is 3 minutes. Treat the preliminarily compressed and densified wood with air-cooling technology. After treatment, the surface temperature of the preliminarily compressed and densified wood is 30 °C, the temperature of the air is 15 °C, and the wind speed is 25 m / s. Balance for 10 days at room temperature to obtain the agarwood compacted wood.

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