CN101642917A - Production method of hard wood sheet with two-clamping-piece layer structure - Google Patents

Abstract

The invention relates to the technical field of production methods of hard wood sheets, in particular to a production method of a hard wood sheet with a two-clamping-piece-layer structure, which comprises the steps of softening a panel layer wood sheet, leveling and dehumidifying the panel layer wood sheet, conveying the panel layer wood sheet into a sheet dehumidifying chamber, controlling the water content of the panel layer wood sheet to be 6-8% through the sheet dehumidifying chamber, finely cutting the panel layer wood sheet, cutting the panel layer wood sheet into prepared materials with required sizes according to requirements, and finally performing press-fit treatment on the panel layer wood sheet to finish the production of the hard wood sheet with the two-clamping-piece-layer structure; the hard wood sheet with the two-clamping-piece-layer structure produced by the production method can overcome the problem that natural hard wood sheet is easy to crack, greatly reduces the reject ratio of furniture products, and improves the value of the furniture products.

Description

Production method of hard wood veneer with two sandwich layer structure

Technical field:

The invention relates to the technical field of production methods of hard wood veneers, in particular to a production method of hard wood veneers with a double sandwich layer structure.

Background technique:

In wooden furniture, natural high-grade hard wood veneers are often used, such as spiral mahogany veneer, tree fork mahogany veneer, tree fork walnut veneer, camphor wood veneer, etc. These hard wood veneers are usually from The fork part of the tree growth or the nodule part of the tree is hard to come by and very precious. And because the part taken is at the position where the growth of the tree varies, the properties of this hardwood veneer are completely different from those of ordinary veneers. If special treatment is not carried out during the processing of this hardwood veneer, it will often occur The problem of cracking will greatly increase the defect rate of furniture products and reduce the value of furniture products.

Invention content:

The purpose of the present invention is to address the deficiencies of the prior art, to provide a production method of hardwood veneers with a two-layer structure, which can overcome the problem that natural hardwood veneers are prone to cracking, and greatly reduce the defect rate of furniture products , Enhance the value of furniture products.

In order to achieve the above object, the present invention is realized by the following technical scheme: the production method of the hard wood veneer of two sandwich layer structures, it comprises the following steps:

Step 1, softening the panel layer wood veneer, specifically:

Step A, using the softener and water to prepare a softener solution;

Step B, immersing the panel ply wood veneer in a softener solution, or spraying the softener solution onto the front and back of the panel ply wood veneer;

Step C, placing the panel layer wood veneer to be dried;

Step D, after drying, pack the veneer of the panel layer with PE film and lay it flat, and press a leveling board on the top and bottom of the veneer of the panel layer, so that the veneer of the panel layer is fully softened;

Step 2, leveling and dehumidifying the wood veneers of the panel layer, specifically:

Step E, laminating and placing the softened veneers of the panel layer, and separating the veneers of the panel layer with cold plates with a moisture content of 8% to 12% during lamination, so as to dry the surface of the veneers of the panel layer;

Step F, stacking the veneers of the panel layer and placing them in a drying room. During lamination, the wood veneers of the panel layer are separated by a hot plate with a moisture content of 6% to 8%, and the temperature of the drying room is controlled at 35°C to 45°C ;

Step G, detecting the moisture content of the wood veneer of the panel layer, if the moisture content is less than or equal to 10%, then proceed to step three; if the moisture content> 10%, then re-enter step F;

Step 3, sending the panel layer wood veneer into the veneer dehumidification chamber, and controlling the moisture content of the panel layer wood veneer to 6% to 8% through the veneer dehumidification chamber;

Step 4, fine-cutting the panel layer wood veneers, and cutting them into the required size as required;

Step 5, carry out lamination processing on the wood veneers of the panel layer, specifically:

Step H, taking the wood veneer of the back layer with a moisture content of 6% to 8%, and cutting the wood veneer of the back layer into the same size as the wood veneer of the face plate;

Step 1, attaching the wood veneer of the backboard layer and the wood veneer of the panel layer, and the wood grain direction of the wood veneer of the backboard layer and the wood veneer of the panel layer are 90°, and a film tape;

Step J, putting the laminated backboard layer wood veneer and panel layer wood veneer into a hot press for hot pressing to form a two-layer sandwich structure of the veneer;

Step K, after hot pressing, spray water mist on the front and back of the sheet, stack the sheets on a flat pallet, and place a flat plate between each layer of sheets;

In step L, the production of the hard wood veneer with the two sandwich layer structure is completed.

Before proceeding to step 4, take the wood veneer of the panel layer for absolute dry moisture content test, and test the moisture content of the wood veneer of the panel layer. If the moisture content is ≤ 10%, go to step 5; After the wood veneer is dried and leveled by a hot press, step 3 is re-entered.

The drying and leveling treatment of the panel layer wood flakes with a hot press is specifically, sending the panel layer wood veneers with a moisture content > 10% into a hot press for drying and leveling, and the drying and leveling conditions are: pressurized The temperature is not higher than 80°C, hot-press once every 1-3 minutes, release chlorine gas for 15-25 seconds after each hot-press, and hot-press 3-6 times.

In the step A of the first step, the softener and water are prepared in a ratio of 1:1 by specific gravity to prepare a softener solution.

In step 4, after fine-cutting the wood veneers of the panel layer, use a suction cup to detect the seams and defects of the veneers, and trim them if there is any abnormality.

In step I of step five, the film adhesive tape is a synthetic resin film adhesive tape or a melamine film adhesive tape.

In Step J of Step 5, put the bonded wood veneer of the back layer and the wood veneer of the panel layer into the hot press for hot pressing. 3 to 5 minutes, the hot pressing pressure is 200 to 225 pounds per square inch.

In Step K of Step 5, the stacking time of the thin slices on the flat pallet is 22 to 24 hours.

The beneficial effect of the present invention is: the present invention provides a kind of production method of the hard wood veneer of double sandwich layer structure, this production method first carries out softening treatment to veneer of veneer layer, then carries out leveling and dehumidification to veneer of veneer veneer After processing, the panel layer wood flakes are sent to the flake dehumidification chamber, and the moisture content of the panel layer wood flakes is controlled by the flake dehumidification chamber to be 6% to 8%. Then, the panel layer wood flakes are finely cut and cut into required The size of the material is prepared, and finally the panel layer wood veneer is pressed to complete the production of the hard wood veneer with the two sandwich layer structure; the hard wood veneer with the two sandwich layer structure of the above production method can overcome the natural hard wood veneer Wood veneers are prone to cracking, which greatly reduces the defective rate of furniture products and increases the value of furniture products.

Detailed ways:

The present invention is described further below:

Embodiment one, illustrate with the example that produces the tree fork mahogany sheet of two interlayer structures, it may further comprise the steps:

Step 1, softening the panel layer wood veneer, the panel layer wood veneer is a mahogany veneer, specifically:

Step A, preparing softener solution according to the proportion of softener and water in a ratio of 1:1; wherein the softener is GW30 softener;

Step B, dipping the panel layer wood veneer into the softener solution and taking it out immediately, or spraying the softener solution onto the front and back of the panel layer wood veneer;

Step C, placing the veneer of the panel layer on an inclined plane to be dried for 3 to 5 minutes;

Step D, after drying, use PE film to pack the wood veneer of the panel layer and lay it flat. The function of packing is to prevent the wood veneer of the panel layer from contacting with the air and speed up the drying of the softener solution, affecting the penetration of the softener solution. The upper and lower layers of the wood veneer are pressed with relatively heavy flat boards, and placed for more than 2 days, so that the softener solution has enough time to penetrate into the veneer, so that the veneer of the panel layer is fully softened;

Step 2, leveling and dehumidifying the wood veneers of the panel layer, specifically:

Step E, laminating and placing the softened panel layer wood veneers, separating the panel layer wood veneers with a cold plate with a moisture content of 10% during lamination, and placing them for 2 to 4 days to dry the surface of the panel layer wood veneers; Among them, the cold plate with a moisture content of 10% can prevent the moisture absorption of the wood veneer of the panel layer;

Step F, stack the veneers of the panel layer and place them in the drying room. During lamination, the veneers of the panel layer are separated by a hot plate with a moisture content of 7%, and placed for a certain period of time to reduce the moisture content of the veneers of the panel layer , the temperature of the drying room is controlled at 40°C; the temperature of the hot plate is close to the temperature of the drying room;

Step G, detecting the moisture content of the wood veneer of the panel layer, if the moisture content is less than or equal to 10%, then proceed to step three; if the moisture content> 10%, then re-enter step F;

Step 3, sending the wood veneer of the panel layer into the veneer dehumidification chamber, placing it for several days, and controlling the moisture content of the veneer of the panel layer to 7% through the veneer dehumidification chamber;

Before fine-cutting the wood veneer of the panel layer, take the wood veneer of the panel layer for dry moisture content test, test the moisture content of the wood veneer of the panel layer, if the moisture content is ≤ 10%, go to step 5; if the moisture content > 10%, the wood veneer of the panel layer is dried and leveled by a hot press machine, specifically, the wood veneer of the panel layer with a moisture content > 10% is sent to the hot press machine, and hot pressed at a temperature of 78°C for 120 seconds , hot-pressed every 2 minutes, and chlorine gas is released for 20 seconds after each hot-press to increase the softening degree of the veneer of the panel layer. A total of 3 times of hot-pressing makes the veneer of the panel layer flat, and then the heavy board can be used to press the veneer of the panel layer After 24 hours of flakes, the wood veneer of the panel layer is sent into the veneer dehumidification chamber, and the temperature in the veneer dehumidification chamber is controlled to be 40°C, and the moisture content of the veneer of the panel layer is controlled to be 7%;

The calculation method of the above-mentioned absolute-dry moisture content test is: absolute-dry moisture content of wood=(wood weight-wood absolute-dry weight)/wood absolute-dry weight, wherein, the wood weight is the actual measured weight, and the wood absolute-dry weight is after the wood is completely dried. the weight of;

Step 4: Fine-cut the wood veneers of the panel layer, and cut them into the required size as required; after fine-cutting the wood veneers of the panel layer, use a suction cup to detect the joints and defects of the veneers, and trim them if there is any abnormality Prepare the required materials;

Step 5, carry out lamination processing on the wood veneers of the panel layer, specifically:

Step H, taking the wood veneer of the backboard layer with a moisture content of 7%, the wood veneer of the backboard layer is cherry wood veneer, and rotary cutting the wood veneer of the backboard layer into the same size as the wood veneer of the panel layer;

Step 1, attaching the wood veneer of the backboard layer and the wood veneer of the panel layer, and the wood grain direction of the wood veneer of the backboard layer and the wood veneer of the panel layer are 90°, and a Film adhesive tape; film adhesive tape can be synthetic resin film adhesive tape, also can be melamine film adhesive tape;

Step J, put the bonded backboard layer wood veneer and panel layer wood veneer into a hot press for hot pressing to form a thin film with two sandwich layers; the hot pressing conditions are: the hot pressing temperature is 120°C, and the hot pressing The pressing time is 4 minutes, and the hot pressing pressure is 210 pounds per square inch;

Step K, after hot pressing, spray water mist on the front and back of the sheet, stack the sheets on a flat pallet, and place a flat plate between each layer of sheets;

In step L, the production of the hard wood veneer with the two sandwich layer structure is completed.

So far, the production of the tree fork mahogany veneer with two sandwich layer structures has been completed. After cooling the tree fork mahogany veneer of the two-layer structure for 24 hours, carry out hot pressing and lamination on the furniture board, then carry out sanding and painting treatment, and then carry out 6 cooling thermal cycle tests, each time cooling The heat cycle test includes drying at a temperature of 50°C for 2 hours, and then freezing at a temperature of -20°C for 2 hours. After the cooling heat cycle test, the quality of the furniture is good.

Embodiment 2, taking the production of the spiral mahogany veneer with two interlayer structures as an example, compared with Example 1, the difference is that in step J, the laminated back ply veneer and the panel The hot-pressing conditions for putting the ply wood sheets into a hot-pressing machine are as follows: the hot-pressing temperature is 150° C., the hot-pressing time is 4.5 minutes, and the hot-pressing pressure is 220 pounds per square inch.

In summary, adopting the production method of the hard wood veneer with two interlayer structures of the present invention, the hard wood veneer with two interlayer structures produced is applied in wooden furniture, which can overcome natural hard wood veneers. Wood veneers are prone to cracking, which greatly reduces the defective rate of furniture products and increases the value of furniture products.

The above are only preferred embodiments of the present invention, so all equivalent changes or modifications made according to the structure, features and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims (8)

1, the production method of the hard wood veneer of two interlayer structure, it is characterized in that, it comprises the following steps: Step 1, softening the panel layer wood veneer, specifically: Step A, using the softener and water to prepare a softener solution; Step B, immersing the panel ply wood veneer in a softener solution, or spraying the softener solution onto the front and back of the panel ply wood veneer; Step C, placing the panel layer wood veneer to be dried; Step D, after drying, pack the veneer of the panel layer with PE film and lay it flat, and press a leveling board on the top and bottom of the veneer of the panel layer, so that the veneer of the panel layer is fully softened; Step 2, leveling and dehumidifying the wood veneers of the panel layer, specifically: Step E, laminating and placing the softened veneers of the panel layer, and separating the veneers of the panel layer with cold plates with a moisture content of 8% to 12% during lamination, so as to dry the surface of the veneers of the panel layer; Step F, stacking the veneers of the panel layer and placing them in a drying room. During lamination, the wood veneers of the panel layer are separated by a hot plate with a moisture content of 6% to 8%, and the temperature of the drying room is controlled at 35°C to 45°C ; Step G, detecting the moisture content of the wood veneer of the panel layer, if the moisture content is less than or equal to 10%, then proceed to step three; if the moisture content> 10%, then re-enter step F; Step 3, sending the panel layer wood veneer into the veneer dehumidification chamber, and controlling the moisture content of the panel layer wood veneer to 6% to 8% through the veneer dehumidification chamber; Step 4, fine-cutting the panel layer wood veneers, and cutting them into the required size as required; Step 5, carry out lamination processing on the wood veneers of the panel layer, specifically: Step H, taking the wood veneer of the back layer with a moisture content of 6% to 8%, and cutting the wood veneer of the back layer into the same size as the wood veneer of the face plate; Step 1, attaching the wood veneer of the backboard layer and the wood veneer of the panel layer, and the wood grain direction of the wood veneer of the backboard layer and the wood veneer of the panel layer are 90°, and a film tape; Step J, putting the laminated backboard layer wood veneer and panel layer wood veneer into a hot press for hot pressing to form a two-layer sandwich structure of the veneer; Step K, after hot pressing, spray water mist on the front and back of the sheet, stack the sheets on a flat pallet, and place a flat plate between each layer of sheets; In step L, the production of the hard wood veneer with the two sandwich layer structure is completed. 2. The production method of the hard wood veneer with two interlayer structures according to claim 1, characterized in that: before step 4, the panel layer wood veneer is taken for the absolute dry moisture content test, and the panel layer wood veneer is tested. For the moisture content of the sheet, if the moisture content is less than or equal to 10%, proceed to step five; if the moisture content is greater than 10%, then proceed to step three again after drying and leveling the wood veneer of the panel layer by a hot press. 3. The production method of the hard wood veneer with two interlayer structures according to claim 2, characterized in that: the drying and leveling treatment of the panel layer wood veneer is specifically as follows: the moisture content> 10% of the wood veneer of the panel layer is sent to the hot press machine for drying and leveling. The drying and leveling conditions are as follows: the pressurized temperature is not higher than 80°C, hot-pressed every 1-3 minutes, and chlorine gas is released after each hot-pressed time 15-25 seconds, hot pressing 3-6 times. 4. The method for producing hardwood veneers with two interlayer structures according to claim 1, characterized in that: in step A of said step 1, the softener and water are prepared in a ratio of 1:1 by specific gravity out softener solution. 5. The production method of the hard wood veneer with two interlayer structures according to claim 1, characterized in that: in step 4, after fine-cutting the panel layer wood veneer, use a sucker to detect the seams and defects of the veneer If there is any abnormality, then repair it. 6. The production method of the hard wood veneer with two interlayer structures according to claim 1, characterized in that: in step 1 of step five, the film adhesive tape is synthetic resin film adhesive tape or melamine film adhesive Paper. 7, the production method of the hard wood veneer of two interlayer structure according to claim 1, it is characterized in that: in the step J of step 5, the wood veneer of the back board layer and the wood veneer of the face plate layer that fit well are placed The hot-pressing conditions for hot-pressing in a hot-pressing machine are as follows: hot-pressing temperature is 110° C. to 160° C., hot-pressing time is 3-5 minutes, and hot-pressing pressure is 200-225 pounds per square inch. 8. The method for producing hardwood veneers with two interlayer structures according to claim 1, characterized in that: in Step K of Step 5, the stacking time of the veneers on the flat pallet is 22 to 24 Hour.