Anticorrosive and antimildew environment-friendly plywood and preparation method thereof

Abstract

The present application relates to the technical field of plate processing, and particularly relates to an anti-corrosion and anti-mildew environment-friendly plywood and a preparation method thereof, which comprises the following steps: cutting raw wood to obtain veneers; drying the veneers; preparing a lactic acid bacteria suspension, soaking the veneers in the lactic acid bacteria suspension, and placing the veneers in a vacuum chamber for vacuum treatment, stopping the vacuum treatment until the air pressure in the vacuum chamber is balanced with the outside environment, and then taking out the veneers; placing the obtained veneers in a sealed environment at 30-35 DEG C for 24-48 hours; using a gluing machine to glue the veneers, and assembling the veneers; and cold pressing the assembled veneers at a temperature below 45 DEG C. The dried veneers are soaked in the lactic acid bacteria suspension, and the gas in the dried veneers is discharged under the action of vacuum, so that space is left in the veneers, and the lactic acid bacteria suspension can penetrate into the veneers. The lactic acid bacteria are planted and lactic acid is generated, so that an acidic environment is formed in the veneers, and the service life of the veneers is prolonged.

Description

Technical Field

[0001] This invention relates to the field of board processing technology, specifically to a corrosion-resistant, mildew-resistant, and environmentally friendly plywood and its preparation method. Background Technology

[0002] Plywood is a commonly used material in furniture making; it is a type of engineered wood panel. A set of veneers is typically glued together with adjacent layers perpendicular to each other's grain direction. The face veneers and inner veneers are usually symmetrically arranged on both sides of the core layer. The panels, made by gluing veneers and then pressing them together under heated or unheated conditions, are formed from these interlaced veneers. The number of layers is generally odd, but an even number is also possible in some cases. The physical and mechanical properties in the longitudinal and transverse directions are relatively similar. Common types include three-ply and five-ply plywood. Plywood improves wood utilization and is a major way to conserve timber.

[0003] In the field of plywood corrosion and mildew prevention, existing technologies mainly rely on chemical preservatives such as dibromocyanoacetamide and FMB mildew inhibitors or physical treatments such as drying and impregnation. However, chemical preservatives are somewhat polluting, and physical treatments become ineffective after a certain period of time. Therefore, there is a need for an environmentally friendly plywood that can achieve both corrosion and mildew prevention and its preparation method. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an environmentally friendly plywood that is both corrosion-resistant and mildew-resistant, and a method for preparing the same.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A method for preparing corrosion-resistant, mildew-resistant, and environmentally friendly plywood includes: Step 1: Cut the logs to obtain veneers, and cut the veneers to the standard width, while removing defective veneers; Step 2: Dry the veneer to reduce its moisture content to 8%-12% to obtain dried veneer; Step 3: Prepare the lactic acid bacteria suspension, immerse the dried veneer in the lactic acid bacteria suspension and place it in a vacuum chamber for vacuum treatment, so that the lactic acid bacteria suspension penetrates into the dried veneer. Then stop the vacuum until the air pressure in the vacuum chamber is equal to that in the outside world, and then take out the veneer. Step 4: Place the veneer obtained in Step 3 in a 30℃–35℃ and sealed environment for 24–48 hours, where lactic acid bacteria will rapidly colonize and produce lactic acid. Step 5: Apply glue to the veneer obtained in Step 4 using a glue applicator, and then assemble the glued veneer. Step 6: After the preform is assembled, it is cold-pressed at a temperature below 45°C and then allowed to dry and solidify to obtain the board.

[0006] Preferably, the lactic acid bacteria used to prepare the lactic acid bacteria suspension are Lactobacillus plantarum and / or Lactobacillus rhamnosus.

[0007] Preferably, before applying glue using a glue applicator, the veneer obtained in step 4 is dried until the moisture content is 6%-14%.

[0008] Preferably, when using a glue applicator, all surfaces of the veneer are fully coated.

[0009] Preferably, 1-2% glucose is added to the lactic acid bacteria suspension.

[0010] Preferably, the pH value of the lactic acid bacteria suspension is 5.0-6.0.

[0011] Preferably, after the preform is assembled, it is subjected to repeated cold pressing at a temperature below 45°C until the glue dries and solidifies.

[0012] Preferably, the time interval between each cold pressing is 6-12 hours.

[0013] Preferably, after the dried and molded sheet is cut to a predetermined size, glue is applied to the cut area.

[0014] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is as follows: A corrosion-resistant, mildew-resistant, and environmentally friendly plywood is prepared using the above-mentioned method for preparing corrosion-resistant, mildew-resistant, and environmentally friendly plywood.

[0015] The beneficial effects of this invention are as follows: By soaking the dried veneer in a lactic acid bacteria suspension, under vacuum treatment, the gas inside the dried veneer is discharged under vacuum, leaving space, while the lactic acid bacteria suspension can penetrate into the dried veneer. When the air pressure is balanced, more lactic acid bacteria suspension can be forced into the veneer under air pressure. At the same time, vacuuming also creates a micro-aerobic or anaerobic state, which is more suitable for the growth of lactic acid bacteria. Combined with placing the veneer in a sealed environment at 30℃–35℃ for 24–48 hours, lactic acid bacteria quickly colonize and generate lactic acid. Due to the effect of lactic acid, an acidic environment can be formed inside the veneer, which can inhibit the growth of mold and other microorganisms that cause decay, thereby greatly extending the service life of the veneer. Furthermore, after the embryo is assembled, cold pressing is performed at 45℃ to avoid high-temperature hot pressing killing the lactic acid bacteria and causing the later anti-corrosion and anti-mold failure. Attached Figure Description

[0016] Figure 1 This is a schematic flowchart illustrating a method for preparing corrosion-resistant, mildew-resistant, and environmentally friendly plywood according to a specific embodiment of the present invention. Detailed Implementation

[0017] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0018] Please refer to Figure 1 A method for preparing corrosion-resistant, mildew-resistant, and environmentally friendly plywood, comprising: Step 1: Cut the logs to obtain veneers, and make the veneer building materials to the standard width, while removing defective veneers; Step 2: Dry the veneer to reduce its moisture content to 8%-12% to obtain dried veneer; Step 3: Prepare the lactic acid bacteria suspension, immerse the dried veneer in the lactic acid bacteria suspension and place it in a vacuum chamber for vacuum treatment, so that the lactic acid bacteria suspension penetrates into the dried veneer. Then stop the vacuum until the air pressure in the vacuum chamber is equal to that in the outside world, and then take out the veneer. Step 4: Place the veneer obtained in Step 3 in a 30℃–35℃ and sealed environment for 24–48 hours, where lactic acid bacteria will rapidly colonize and produce lactic acid. Step 5: Apply glue to the veneer obtained in Step 4 using a glue applicator, and then assemble the glued veneer. Step 6: After the preform is assembled, it is cold-pressed at a temperature below 45°C and then allowed to dry and solidify to obtain the board.

[0019] As described above, by soaking dried veneers in a lactic acid bacteria suspension and then applying vacuum treatment, the gas inside the dried veneer is expelled under vacuum, leaving space for the lactic acid bacteria suspension to penetrate. Furthermore, when the air pressure is balanced, more lactic acid bacteria suspension can be forced into the veneer under pressure. Simultaneously, vacuuming creates a micro-aerobic or anaerobic environment, which is more suitable for the growth of lactic acid bacteria. Combined with placing the veneer in a sealed environment at 30℃–35℃ for 24–48 hours, lactic acid bacteria rapidly colonize and produce lactic acid. Due to the action of lactic acid, an acidic environment is formed inside the veneer, which inhibits the growth of mold and other microbial decay, thus greatly extending the veneer's service life. Moreover, cold pressing at 45℃ after embryo assembly avoids the high-temperature hot pressing that kills the lactic acid bacteria, preventing subsequent failure of anti-corrosion and anti-mold measures.

[0020] Furthermore, the lactic acid bacteria used to prepare the lactic acid bacteria suspension are Lactobacillus plantarum and / or Lactobacillus rhamnosus.

[0021] As described above, *Lactobacillus plantarum* has a significant inhibitory effect on molds (such as *Aspergillus niger* and *Penicillium*), while *Lactobacillus rhamnosus* has a broader antibacterial spectrum. Combining the two results in a synergistic effect and even better efficacy. The type of lactic acid bacteria can be adjusted according to the specific circumstances. Different varieties of *Lactobacillus plantarum* or *Lactobacillus rhamnosus* can be used for different types of wood, and the ratio can also be adjusted. Alternatively, other lactic acid bacteria can be used. If bamboo is used, further adjustments are required.

[0022] Furthermore, before applying glue using a glue applicator, the veneer obtained in step 4 is dried until the moisture content is 6%-14%.

[0023] Furthermore, when using a glue applicator, all surfaces of the veneer are fully coated with glue.

[0024] As can be seen from the above description, by coating all surfaces, a seal can be formed, ensuring that lactic acid bacteria consume the sugar in the wood to produce lactic acid in a sealed environment, forming an acidic environment. The consumed sugar can reduce the growth requirements of mold and other miscellaneous bacteria, while the acidic environment formed by lactic acid inhibits the growth of mold and other miscellaneous bacteria, achieving two benefits at once.

[0025] Furthermore, 1-2% glucose is added to the lactic acid bacteria suspension.

[0026] As can be seen from the above description, glucose is supplemented as a carbon source to initiate lactic acid bacteria.

[0027] Furthermore, the pH value of the lactic acid bacteria suspension is 5.0-6.0.

[0028] As can be seen from the above description, lactic acid bacteria are more acid-resistant in a slightly acidic environment and can kill most of the other bacteria in advance.

[0029] Furthermore, after the preform is assembled, it is repeatedly cold-pressed at a temperature below 45°C until the glue dries and solidifies.

[0030] As can be seen from the above description, since hot pressing is not possible, the forming effect of the board can only be ensured by repeated cold pressing.

[0031] Furthermore, the time interval between each cold pressing is 6-12 hours.

[0032] As can be seen from the above description, with an interval of 6-12 hours, due to the deformation and stress changes that occur during natural cooling, sufficient time is given to ensure that the glue dries, but not enough time for the glue to completely dry and set. Therefore, the existence of the interval allows for correction after deformation or stress changes.

[0033] Furthermore, after the dried and shaped board is cut to a predetermined size, glue is applied to the cut areas.

[0034] As can be seen from the above description, by applying glue, the airtightness of the veneer can be ensured, and the lactic acid bacteria can always be kept in a relatively closed space.

[0035] A corrosion-resistant, mildew-resistant, and environmentally friendly plywood is prepared using the above-mentioned method for preparing corrosion-resistant, mildew-resistant, and environmentally friendly plywood. Example 1

[0036] A method for preparing corrosion-resistant, mildew-resistant, and environmentally friendly plywood includes: Step 1: Cut the logs to obtain veneers, and make the veneer building materials to the standard width, while removing defective veneers; Step 2: Dry the veneer to reduce its moisture content to 8%-12% to obtain dried veneer; Step 3: Prepare the lactic acid bacteria suspension. The lactic acid bacteria used to prepare the suspension are *Lactobacillus plantarum* (2 × 10⁻⁶). 6 (CFU / ml). 1-2% glucose is also added to the lactic acid bacteria suspension. The pH value of the lactic acid bacteria suspension is 5.0-6.0. The dried veneer is immersed in the lactic acid bacteria suspension and placed in a vacuum chamber for vacuum treatment. After the lactic acid bacteria suspension penetrates into the dried veneer, the vacuum is stopped until the air pressure inside the vacuum chamber equalizes with the outside air pressure, and then the veneer is removed. Step 4: Place the veneer obtained in Step 3 in a 30℃–35℃ and sealed environment for 24–48 hours, where lactic acid bacteria will rapidly colonize and produce lactic acid. Step 5: Dry the veneer obtained in Step 4 until the moisture content is 6%-14%. Apply glue to the veneer using a glue applicator. Before applying glue, ensure all surfaces of the veneer are fully coated. Then, assemble the glued veneer. Step 6: After the preform is assembled, repeatedly cold-press it at a temperature below 45℃ until the glue dries and solidifies to obtain the board. The time interval between each cold pressing is 6-12 hours. After the dried and solidified board is cut to the predetermined size, glue is applied to the cut areas. Example 2

[0037] A method for preparing corrosion-resistant, mildew-resistant, and environmentally friendly plywood is described, and the similarities with Example 1 will not be repeated here. The difference lies in that the lactic acid bacteria used to prepare the lactic acid bacteria suspension are *Lactobacillus rhamnosus* (1.0-1.4 × 10⁻⁶). 7 (CFU / ml). Example 3

[0038] A method for preparing anti-corrosion, anti-mildew, and environmentally friendly plywood is described, and the similarities with Example 1 will not be repeated here. The difference is that: the lactic acid bacteria used in preparing the lactic acid bacteria suspension is 1 part (1.0 × 10⁻⁶) of *Lactobacillus plantarum*. 6 CFU / ml) and 5 samples of Lactobacillus rhamnosus (5.0 × 10⁻⁶ CFU / ml) 6 (CFU / ml). By controlling the overall concentration, corrosion of the substrate (wood) is reduced. Example 4

[0039] A corrosion-resistant, mildew-resistant, and environmentally friendly plywood is prepared using the corrosion-resistant, mildew-resistant, and environmentally friendly plywood preparation method described in any one of Examples 1 to 3.

[0040] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for preparing corrosion-resistant, mildew-resistant, and environmentally friendly plywood, characterized in that, include: Step 1: Cut the logs to obtain veneers, and cut the veneers to the standard width, while removing defective veneers; Step 2: Dry the veneer to reduce its moisture content to 8%-12% to obtain dried veneer; Step 3: Prepare the lactic acid bacteria suspension, immerse the dried veneer in the lactic acid bacteria suspension and place it in a vacuum chamber for vacuum treatment, so that the lactic acid bacteria suspension penetrates into the dried veneer. Then stop the vacuum until the air pressure in the vacuum chamber is equal to that in the outside world, and then take out the veneer. Step 4: Place the veneer obtained in Step 3 in a 30℃–35℃ and sealed environment for 24–48 hours, where lactic acid bacteria will rapidly colonize and produce lactic acid. Step 5: Apply glue to the veneer obtained in Step 4 using a glue applicator. When applying glue, cover all surfaces of the veneer completely and then assemble the glued veneer. Step 6: After the preform is assembled, cold press it at a temperature below 45°C until the glue dries and forms a board. Cut the dried board to the predetermined size and apply glue to the cut areas. Cold pressing extends the lifespan of the lactic acid bacteria and achieves later anti-corrosion and anti-mildew effects.

2. The method for preparing corrosion-resistant, mildew-resistant, and environmentally friendly plywood according to claim 1, characterized in that, The lactic acid bacteria used to prepare the lactic acid bacteria suspension are Lactobacillus plantarum and / or Lactobacillus rhamnosus.

3. The method for preparing corrosion-resistant, mildew-resistant, and environmentally friendly plywood according to claim 2, characterized in that, Before applying glue using a glue applicator, dry the veneer obtained in step 4 until the moisture content is 6%-14%.

4. The method for preparing anti-corrosion, anti-mildew, and environmentally friendly plywood according to claim 1, characterized in that, The lactic acid bacteria suspension also contains 1-2% glucose.

5. The method for preparing anti-corrosion, anti-mildew, and environmentally friendly plywood according to claim 1, characterized in that, The pH value of the lactic acid bacteria suspension is 5.0-6.

0.

6. The method for preparing corrosion-resistant, mildew-resistant, and environmentally friendly plywood according to claim 1, characterized in that, After the preform is assembled, it is repeatedly cold-pressed at a temperature below 45°C until the glue dries and solidifies.

7. The method for preparing anti-corrosion, anti-mildew, and environmentally friendly plywood according to claim 6, characterized in that, The interval between each cold pressing is 6-12 hours.

8. A corrosion-resistant, mildew-resistant, and environmentally friendly plywood, characterized in that, The plywood is prepared using the method for preparing anti-corrosion, anti-mildew, and environmentally friendly plywood according to any one of claims 1-7.

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