Production process of aldehyde-removing environment-friendly plate

Abstract

This invention relates to the field of environmentally friendly wooden flooring technology, specifically a production process for formaldehyde-removing environmentally friendly boards. The invention involves rolling wood veneer onto the surface of the board blank, then compounding a formaldehyde-removing agent. The formaldehyde-removing agent is a mixed aqueous solution of lysine and adipic acid dihydrazide. The formaldehyde is removed through atomization, and the agent penetrates the board to remove formaldehyde from both the board itself and the adhesive, thus eliminating formaldehyde. The agent penetrates deep into the board, ensuring thorough formaldehyde removal. The process utilizes the nucleophilic addition of primary amines to aldehydes to generate stable, non-volatile, and non-toxic substances.

Description

Technical Field

[0001] This invention relates to the field of environmentally friendly wooden flooring technology, and in particular to a production process for formaldehyde-removing environmentally friendly boards. Background Technology

[0002] During the production of engineered wood flooring, the use of adhesives and other chemical reagents results in a high formaldehyde content. Formaldehyde has a melting point of -92℃, a boiling point of -21℃, and a density of 0.815 g / cm³ (20℃) in its liquid state. It is readily soluble in water and ethanol. Formaldehyde molecules contain an aldehyde group and are an important organic raw material; it is a colorless gas with a strong, pungent odor. Various engineered wood products (particleboard, fiberboard, plywood, etc.) contain formaldehyde due to the use of adhesives. Adhesives are used in the manufacture of new furniture and in the decoration of walls and floors. Wherever adhesives are used extensively, formaldehyde will be released. In addition, some synthetic fiber carpets and paints also contain a certain amount of formaldehyde.

[0003] The main reason for formaldehyde abuse is its low price. Formaldehyde production is increasing year by year, consistent with the development of the textile and building materials industries, indicating that formaldehyde will remain a favorite in the chemical industry for a long time to come. Frequent inhalation of small amounts of formaldehyde can cause chronic poisoning, resulting in symptoms such as mucosal congestion, skin irritation, allergic dermatitis, nail keratinization and brittleness, and pain in the nail bed and fingertips.

[0004] High concentrations of formaldehyde inhaled in laboratory settings can cause nasopharyngeal tumors in laboratory animals. Indoor spaces are the primary living and working spaces for humans, where people spend at least 12 hours a day. Indoor air quality has a crucial impact on human health. Due to technological and material limitations, it is currently impossible to completely eliminate the use of formaldehyde-containing raw materials in the manufacture of interior furniture and decoration, thus failing to remove formaldehyde hazards at the source. Therefore, highly efficient and environmentally friendly indoor formaldehyde removal materials have promising applications. Since it is impossible to completely restrict formaldehyde use, eliminating and reducing formaldehyde hazards is of paramount importance. Summary of the Invention

[0005] The technical problem to be solved by this invention is: how to eliminate and reduce the harm caused by formaldehyde in existing wood-based panels.

[0006] To solve the above-mentioned technical problems, the inventors, through practice and summarization, derived the technical solution of this invention, which adopts the following technical solution:

[0007] A formaldehyde-removing and environmentally friendly board manufacturing process, characterized by the following steps:

[0008] Slab processing:

[0009] Choose one of the following: solid wood boards, solid wood spliced ​​boards, MDF, or multi-layer composite boards, and make a board blank of a certain thickness and size according to actual needs;

[0010] Floor substrate production:

[0011] After sanding and cleaning the surface of the board blank, apply melamine-formaldehyde resin adhesive, and then roll and bond the finished wood veneer to the surface of the board blank to obtain the flooring blank.

[0012] Formaldehyde removal via atomization:

[0013] A mixed aqueous solution of lysine and adipic acid dihydrazide was ultrasonically atomized in a sealed space to atomize and penetrate the flooring blank. The temperature was maintained between 60 and 70°C during atomization. After drying, the flooring substrate was obtained.

[0014] Substrate Sanding:

[0015] The processed floor substrate is first tongue and groove cut, then sanded by sanders with sanding belts of 120 mesh, 150 mesh and 240 mesh respectively, and the surface is cleaned by a dust removal system to obtain the floor substrate.

[0016] Substrate correction:

[0017] The alignment components together complete the straightening process of the front, side and rear ends of multiple slabs;

[0018] Surface processing:

[0019] Roll a layer of UV putty to fill the base on the floor substrate, dry it with a UV lamp until it is 70% dry, then roll two layers of UV special primer, and then roll one layer of UV colored primer to make the base color of the floor fuller. Dry it with a UV lamp until it is 80% dry, and then use a transfer printing device to transfer the pattern with paint. Dry it with a UV lamp until it is 70% dry.

[0020] Surface treatment: Apply a wear-resistant and scratch-resistant treatment to the surface of the paint pattern.

[0021] Specifically, the molar ratio of the compounded lysine and adipic dihydrazide is (1-2):(3-5), and the total concentration is between (2.61-0.85) mol / ml.

[0022] Specifically, during the atomization aldehyde removal process, ammonium sulfate is added to a mixed aqueous solution of lysine and adipic acid dihydrazide. The molar ratio of lysine, adipic acid dihydrazide, and ammonium sulfate after compounding is (1-2):(3-5):(0.2-0.5), and the total concentration is between (2.65-0.91) mol / ml.

[0023] Specifically, the moisture content of the slab after processing is controlled at 6% to 10%, and the moisture content after atomization formaldehyde removal treatment is controlled at 8% to 12%.

[0024] Specifically, the melamine-formaldehyde is replaced by a formaldehyde-free resin binder. The preparation method of the formaldehyde-free resin binder is as follows: 100 parts of crosslinking modifier, 50-100 parts of water, 100-200 parts of defatted soybean flour, 50-150 parts of activated modified flame retardant, 5-7 parts of water-based thickener, and 0.1-0.2 parts of additives are added sequentially to a reaction vessel, and stirred at 55-110℃ for 1.5-3 hours until homogeneous to obtain the formaldehyde-free resin binder.

[0025] Specifically, the water-based tackifier is a mixture of rosin grease and non-rosin resin, with a solid content of 57% and a viscosity of 300 mPa·s.

[0026] Specifically, the manufacturing process of the finished wood veneer is as follows:

[0027] bleach:

[0028] Add bleaching agents to the bleaching tank. The bleaching agents include sodium percarbonate at a rate of 7-15g per liter and N-[4-(triethylammonium methylene)benzoyl]caprolactam chloride at a rate of 25-45g / L per liter. Immerse the two-color wood veneer in the bleaching agent aqueous solution through the conveying component. The temperature in the bleaching tank is 60-80℃. Rinse with distilled water at least twice.

[0029] Coloring: Prepare the dyeing solution and increase the temperature to 60℃ while simultaneously increasing the temperature. The composition and ratio of the dyeing solution are: Acid Red 3.5g / L, Acid Yellow 10g / L, and Acid Blue 3.1g / L. Pour the prepared dyeing solution into the dyeing tank, raise the temperature to 90-100℃, soak for 1-2 hours, remove and dry to obtain the finished wood veneer.

[0030] Specifically, the process between bleaching and coloring includes a whitening step, which is as follows:

[0031] Whitening agents are added to the whitening tank. The whitening agents include 1.5 to 3.5 g of sodium persulfate per liter and 0.1 to 0.5 g of activator per liter. The two-color wood veneer is immersed in the whitening agent aqueous solution through the conveying component. The temperature in the bleaching tank is 20 to 35°C. It is washed with distilled water at least twice and then dried in a drying device with the temperature set between 25 and 35 degrees Celsius.

[0032] Specifically, the preparation method of the activator includes the following steps:

[0033] First, soak activated carbon in 0.5 mol / L dilute hydrochloric acid at 60℃ for 2 hours. After filtering the sample, slowly add 1 mol / L hydrofluoric acid and soak at 60℃ for 24 hours. Then wash with deionized water until neutral and dry in an oven at 110℃. Next, soak in 10 mol / L HNO3 at 70-90℃ for 10 hours. Filter and wash with deionized water until nearly neutral. Dry in an oven at 110℃ for 10 hours. After removal, heat to 800-900℃ at a rate of 5-10℃ / min under a nitrogen atmosphere of 100 mL / min and hold at that temperature for 30-60 minutes. After cooling, obtain the sample activator.

[0034] Specifically, the bleached wood has a whiteness of 86, a corrosion rate of 0.06%, and does not yellow after 15 days in the air.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] After the wood veneer is rolled onto the surface of the board, a formaldehyde-removing agent is compounded and then atomized to remove formaldehyde. The agent penetrates the board to remove formaldehyde, thus eliminating aldehydes from both the board itself and the adhesive (melamine resin or urea-formaldehyde resin). The agent penetrates deep into the board for thorough formaldehyde removal, utilizing the nucleophilic addition of primary amines to aldehydes to generate stable, non-volatile, and non-toxic substances. A novel formaldehyde-free adhesive resin is also provided to overcome the external introduction of aldehydes into the adhesive. Furthermore, using this adhesive to prepare flooring significantly improves the hot-pressing efficiency, increasing it from (70+30) s / mm to (50~50+25) s / mm.

[0037] This invention utilizes an aqueous solution of sodium peroxide and N-[4-(triethylammonium methylene)benzoyl]caprolactam chloride for immersion bleaching of two-color wood veneer. The sodium peroxide solution, upon dissolving in water, produces hydrogen peroxide and sodium carbonate, providing alkaline conditions. The N-[4-(triethylammonium methylene)benzoyl]caprolactam chloride breaks down the pigment groups to generate 4-(triethylammonium methylene)benzoic acid. Under alkaline conditions, this reacts with sodium carbonate to form its sodium salt and carbon dioxide. The sodium salt and sodium carbonate form an acid-base buffer system with strong buffering capacity, allowing for... The bleaching performance of the activated hydrogen peroxide bleaching system remains consistently high. Adding 2-3 g / L of sodium persulfate can accelerate the decomposition of hydrogen peroxide by utilizing trace amounts of metal ions such as copper and iron ions. The free radicals generated from this decomposition further contribute to the decomposition. This catalytic decomposition by metal ions can cause excessive damage to the fibers, which is detrimental to bleaching. Sodium persulfate hydrolysis products have a good stabilizing effect, possibly because their structures contain nitrogen, which can form complexes with ferrous ions and other metal ions. When sodium persulfate and an activator are combined, the activator promotes the reaction between sodium persulfate and pigment group products, which are then adsorbed by the activator, eliminating quinone and hydroquinone from the pigment group products. This is the principle behind the yellowing phenomenon, which the inventors discovered during long-term experimental analysis. When the inventors were about to abandon the black walnut wood restoration process, they accidentally added sodium persulfate, which inhibited yellowing. By adjusting the formula and innovatively increasing the reaction degree between sodium persulfate and pigment group products, the active adsorption of reaction products is achieved, thus eliminating yellowing. The whitening agent is activated by an activator to increase the content of sulfate free radicals and inhibit sulfate generation, thereby promoting the whitening effect. The activator can be generated at 500°C in nitrogen.

[0038] This invention, after sanding the surface of the floor substrate, uses a correction component to perform the correction work, so that the positions of multiple floor substrates at the ends and sides are corrected and then concentrated in the middle of the conveying component. This ensures the simulation effect of the transferred texture pattern on the board surface and the consistency of the texture of multiple boards.

[0039] Meanwhile, because the tops of the paint rollers and main embossing rollers in the transfer printing equipment are supplied with UV paint via paint pipes, and the paint is repeatedly supplied back to the paint tank through the ends, there is less paint near the roller ends for texture. If the texture near the roller ends is relatively shallow during transfer, it is easy to have a pattern that is darker in the middle and lighter at both ends. This problem can be solved by concentrating the paint in the middle of the conveying assembly. At the same time, a trimming drive cylinder (or an electric push rod) is used in the correction process. The conversion drive structure, composed of a connector and a converter, drives the front correction plate and the side correction plate to work synchronously and asynchronously. The side correction plate and the rear correction plate move synchronously, thereby completing the state and position correction of multiple boards, ensuring that they are concentrated in the middle for transfer processing. The corrected boards are all arranged perpendicular to the paint rollers and the ends are flush, resulting in good consistency and a realistic texture after transfer. Attached Figure Description

[0040] Figure 1 This is a process flow diagram of this application;

[0041] Figure 2 This is a longitudinal cross-sectional view of the overall structure of the correction component in this invention;

[0042] Figure 3 This is a diagram showing the connection relationship between the connector and the converter in this invention;

[0043] Figure 4 This is a schematic diagram of the overall structure of the connector and the converter in this invention;

[0044] Figure 5 This is a top view of the slab correction component in this invention;

[0045] Figure 6 This is a longitudinal view showing the connection relationship between the front correction plate and the horizontal bar in this invention.

[0046] Figure 7 This is a cross-sectional view of the paint roller section of the overall structure of the correction component of the present invention;

[0047] Figure 8 This is a longitudinal schematic diagram of the overall structure of the veneer conveying mechanism of the present invention;

[0048] Figure 9 This is a cross-sectional view of the veneer clamping structure of the present invention before the veneer is loosened;

[0049] Figure 10 This is a one-side view of the veneer clamping structure of the present invention before the veneer is loosened;

[0050] Figure 11 This is a cross-sectional view of the veneer clamping structure of the present invention before the veneer is flipped.

[0051] Figure 12This is a one-side view of the veneer clamping structure of the present invention before the veneer is flipped;

[0052] Figure 13 This is a schematic diagram of the guide structure on the support frame of the present invention;

[0053] Figure 14 This is a diagram showing the positional relationship between the elastic locking pin and the drive plate of the present invention.

[0054] Figure 15 This is a schematic diagram of the front structure of the drive board of the present invention;

[0055] Figure 16 This is a schematic diagram of the back structure of the drive board of the present invention;

[0056] Figure 17 This is a diagram showing the connection relationship between the movable block and the rotating head of the present invention;

[0057] Figure 18 This is a top view of the overall structure of the pressure plate of the present invention;

[0058] Figure 19 This is a diagram showing the connection relationship between the movable plate and the clamping plate of the present invention;

[0059] Figure 20 This is a schematic diagram of the vertical cross-sectional structure of the elastic locking pin and the driven plate according to an embodiment of the present invention;

[0060] Figure 21 A schematic diagram of the horizontal cross-sectional structure of the elastic locking pin and the driven plate;

[0061] Figure 22 for Figure 8 A schematic diagram of the structure of the cleaning component;

[0062] Figure 23 for Figure 8 A partial structural diagram of the cleanup component.

[0063] In the diagram: 1. Frame; 2. Adjusting frame; 3. Adjusting component; 4. Power drive unit; 5. Paint roller; 6. Main embossing roller; 7. Conveying assembly; 8. Vertical guide groove; 9. Dressing drive cylinder; 10. Connector; 11. Horizontal bar; 12. Front end correction plate; 13. Converter; 14. Fixing ring; 15. Guide body; 16. Guide groove; 17. Elastic reset body; 18. Guide sleeve; 19. Connecting frame; 20. Supporting frustum; 21. Connecting rod; 22. Lateral correction plate; 23. Baffle; 24. Rotary shaft; 25. Guide rod; 26. Hinge rod; 27. Rear end correction plate; 28. Universal ball structure; 29. ​​Gasket; 30. Limiting ring; 31. Retaining ring; 32. Vertical bar. Detailed Implementation

[0064] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0065] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0066] Example 1:

[0067] A formaldehyde-removing and environmentally friendly board manufacturing process, the process steps are as follows:

[0068] Slab processing:

[0069] Choose one of the following: solid wood boards, solid wood spliced ​​boards, MDF, or multi-layer composite boards, and make a board blank of a certain thickness and size according to actual needs, with the moisture content controlled between 6% and 10%.

[0070] Floor substrate production:

[0071] After sanding and cleaning the surface of the board blank, apply melamine-formaldehyde resin adhesive, and then roll and bond the finished wood veneer to the surface of the board blank to obtain the flooring blank.

[0072] Formaldehyde removal via atomization:

[0073] A mixed aqueous solution of lysine and adipic acid dihydrazide was ultrasonically atomized in a sealed space to atomize and penetrate the flooring blank. The temperature was maintained between 60 and 70°C during atomization. After drying, the moisture content of the treated material was controlled between 8% and 12% to obtain the flooring substrate.

[0074] Substrate Sanding:

[0075] The processed floor substrate is first tongue and groove cut, then sanded by sanders with sanding belts of 120 mesh, 150 mesh and 240 mesh respectively, and the surface is cleaned by a dust removal system to obtain the floor substrate.

[0076] Substrate correction:

[0077] The alignment components together complete the straightening process of the front, side and rear ends of multiple slabs;

[0078] Surface processing:

[0079] Roll a layer of UV putty onto the floor substrate to fill the base, let it dry with a UV lamp until it is 70% dry, and then roll two more layers of UV-specific primer.

[0080] Apply another round of UV colored primer to make the floor base color richer. Dry it with a UV lamp until it is 80% dry. Then, use a transfer printing device to transfer the pattern with paint and dry it with a UV lamp until it is 70% dry.

[0081] Surface treatment: Apply a wear-resistant and scratch-resistant treatment to the surface of the paint pattern.

[0082] After the wood veneer is rolled onto the surface of the board, a formaldehyde removal agent is compounded and then atomized to remove formaldehyde. The formaldehyde removal agent is used to penetrate and remove formaldehyde, thereby removing aldehydes from the board itself and the adhesive, eliminating formaldehyde. The agent penetrates into the interior of the board to remove formaldehyde completely, and the primary amine is used to nucleophilically add to the aldehydes to generate stable, non-volatile, and non-toxic substances.

[0083] In a preferred embodiment, the molar ratio of lysine and adipic acid dihydrazide is (1-2):(3-5), with the preferred molar ratio being 1:2, and the total concentration is between (2.61-0.85) mol / ml. The actual formaldehyde release of the sample was undetectable, achieving a formaldehyde-free level.

[0084] The method for preparing the formaldehyde-free resin adhesive is as follows: 100 parts of crosslinking modifier, 50-100 parts of water, 100-200 parts of defatted soybean flour, 50-150 parts of activated modified flame retardant, 5-7 parts of water-based tackifier, and 0.1-0.2 parts of additives are added sequentially to a reaction vessel and stirred at 55-110℃ for 1.5-3 hours until homogeneous to obtain the formaldehyde-free resin adhesive.

[0085] The water-based tackifier is a mixture of rosin resin and non-rosin resin, with a solid content of 57% and a viscosity of 300 mPa·s. The addition of the water-based tackifier can greatly improve the viscosity of the adhesive, effectively improve the poor initial tack of the adhesive caused by the addition of activated modified flame retardant, and solve the problems of non-forming and scattering of boards after rolling caused by poor initial tack.

[0086] The modified soybean formaldehyde-free flame retardant adhesive has a coating weight of 200-300 g / m², and is manufactured under the following process conditions: cold pressing time of 1 hour, unit pressure of 7-1.1 kg / cm², hot pressing temperature of 125℃, (50-55+25) s / mm, and unit pressure of 7-1.1 kg / cm². When the activated modified flame retardant is added to the soybean adhesive according to the above proportions, the strength of the soybean adhesive is not only unaffected, but the solid content of the soybean adhesive is also increased. Commercially available soybean adhesives have a solid content of <35%, while the modified soybean formaldehyde-free flame retardant adhesive provided by this invention has a solid content as high as 48-52%, thereby greatly improving the hot pressing efficiency of the flooring from (70+30) s / mm to (50-50+25) s / mm.

[0087] The crosslinking modifier is one or two of modified polyamide resin, epoxy resin, polyisocyanate, and hydroxymethylacrylamide. In some embodiments of the present invention, the crosslinking modifier is a modified polyamide resin with a solid content of 24-26%, a viscosity of 60-100 mPa·s, and a pH value of 3.0-3.5.

[0088] Defatted soybean flour has a protein content of ≥50%, a fat content of ≤1.0%, a carbohydrate content of 25-30%, and an ash content of 4-5%.

[0089] The additive is one of glycerol, propylene glycol, butylene glycol, hexanediol, polyethylene glycol, polysorbate, polypropylene glycol, and sorbitol, and its purpose is to improve the water retention performance of the adhesive.

[0090] Using this type of adhesive to prepare flooring can greatly improve the hot pressing efficiency of the flooring, from (70+30) s / mm to (50~50+25) s / mm.

[0091] Simultaneously, during the atomization aldehyde removal process, ammonium sulfate is added to the mixed aqueous solution of lysine and adipic acid dihydrazide. The molar ratio of lysine, adipic acid dihydrazide, and ammonium sulfate is (1-2):(3-5):(0.2-0.5), and the preferred molar ratio is 1:2:0.3. The total concentration is between (2.65-0.91) mol / ml.

[0092] Example 2: As Figures 1 to 6 As shown, the following improvements are made based on the above embodiments: the correction component includes a frame 1, a conveying component 7 is installed below the frame 1, the conveying component 7 is adapted to rotate at the same speed as the paint roller 5, a trimming drive cylinder 9 is installed on the frame 1 above the conveying component 7, and a connector 10 is installed at the end of the trimming drive cylinder 9, the connector 10 is located on the lower side of the frame 1.

[0093] The bottom end of the connector 10 is fitted with a front correction plate 12 via a horizontal rod 11. A vertical rod 32 extends vertically through the free end of the horizontal rod 11. A spring is fitted on the outside of the vertical rod 32 and is located between the horizontal rod 11 and the front correction plate 12. A retaining ring 31 is provided at the top of the vertical rod and is located at the top of the horizontal rod 11.

[0094] The connector 10 is fitted with a converter 13 on its outer side. The connector 10 is provided with a fixing ring 14 located inside the converter 13. A guide 15 is installed on the fixing ring 14. A guide groove 16 is provided on the side of the converter 13. The guide 15 is adapted to the guide groove 16 and is suitable for driving the converter 13 to move vertically relative to the connector 10 and rotate circumferentially.

[0095] An elastic reset body 17 is provided between the bottom of the fixed ring 14 and the conversion body 13. The elastic reset body 17 is adapted to allow the conversion body 13 to move vertically relative to the connector 10.

[0096] The outer side of the converter 13 is fitted with a guide sleeve 18, and the two can rotate relative to each other and slide circumferentially. The guide sleeve 18 is installed on the lower surface of the frame 1 via the connecting frame 19. A supporting frustum 20 is provided at the bottom of the guide sleeve 18. A limiting ring 30 is movably installed inside the supporting frustum 20, and the limiting ring 30 is fixed to the outer side of the connector 10.

[0097] The top of the converter 13 is connected to a connecting rod 21 via a hinge shaft. The connecting rod 21 is provided in two sets and is arranged in a centrally symmetrical manner.

[0098] The free end of the connecting rod 21 is connected to a lateral correction plate 22 via a rotary shaft 24. The connecting rod 21 moves up and down relative to the lateral correction plate 22, and a baffle 23 is provided on the top of the rotary shaft 24. A guide rod 25 is provided on the side of the lateral correction plate 22 opposite to the frame 1. The guide rod 25 is vertically inserted into the side of the frame 1.

[0099] A hinge rod 26 is installed on the inner side of the end of the lateral correction plate 22 away from the front correction plate 12. A rear correction plate 27 is installed on the free end of the hinge rod 26. The rear correction plate 27 is adapted to gradually move closer to the front correction plate 12 when the lateral correction plates 22 approach each other.

[0100] Based on the above embodiments, the following improvements are made: the bottom of the front correction plate 12, the rear correction plate 27 and the side correction plate 22 are all equipped with a universal ball structure 28, which is suitable for reducing friction with the conveying assembly 7.

[0101] Based on the above embodiments, the following improvements are made: the angle between the hinge rod 26 and the inner wall of the lateral correction plate 22 is an acute angle, ensuring that the rear correction plate 27 moves toward the side closer to the front correction plate 12.

[0102] Based on the above embodiments, the following improvements are made: multiple rolling elements are arranged circumferentially at the bottom of the conversion body 13, and the shearing force between the relative supporting frustum 20 is reduced by the rolling elements.

[0103] Example 3: As Figure 3As shown, based on the above embodiment, the following improvements are made: the guide groove 16 extends vertically downwards from top to bottom and then gradually deflects along the circumferential direction of the converter 13. The upper half of the guide groove 16 is a vertically downward structure suitable for the horizontal rod 11, the lateral correction plate 22, and the rear correction plate 27 to descend relative to the front correction plate 12. The lower half is inclined to drive the converter 13 to rotate relative to the connecting body 10. The rotation of the converter 13 can drive the connecting rod 21 to rotate. The rotation of the connecting rod 21 drives the lateral correction plate 22 to straighten the slab towards the center relative to the frame 1 via the guide rod 25. At the same time, the rear correction plate 27 straightens the slab closer to the front correction plate 12 under the action of the hinge rod 26.

[0104] Example 4: Based on the above examples, the following improvements are made, such as... Figure 2 As shown, a gasket 29 is fitted on the outer side of the connector 10. The gasket 29 is located inside the converter 13 and contacts the retaining ring 14 via ball bearings. The lower surface of the gasket 29 is adapted to be in contact with the top of the elastic return body 17 (spring). The elastic return body 17 acts on the gasket 29, and the ball bearings reduce the shear force between the gasket 29 and the retaining ring 14.

[0105] like Figures 1 to 6 As shown, the substrate calibration steps are as follows:

[0106] A position sensor is pre-installed on the inner side of the frame 1 to collect the slab signal. When the slab signal is detected, the trimming cylinder 9 is started and drives the connector 10 downward through the piston rod. At this time, the connector 10, the converter 13, the front correction plate 12, the side correction plate 22 and the rear correction plate 27 move downward together. The converter 13 will move vertically downward along the guide sleeve 18. The front correction plate 12 will contact the conveying assembly 7 first. The front correction plate 12 aligns and straightens the front ends of multiple slabs. The trimming cylinder 9 stops working.

[0107] When the position sensor collects the slab signal and it disappears, the trimming cylinder 9 is restarted. The fixed ring 14 and the guide body 15 on it will descend vertically along the upper half of the guide groove 16. The horizontal bar 11 will compress the spring and descend relative to the front correction plate 12. At the same time, the side correction plate 22 and the rear correction plate 27 descend together and contact the conveying assembly 7.

[0108] As the connector 10 continues to descend, the guide body 15 enters the lower half of the guide groove 16, and the conversion body 13 will rotate. The conversion body 13 drives the lateral correction plate 22 to make a straight movement towards the center along the length direction of the guide rod 25 via the connecting rod 21. At the same time, the rear correction plate 27 performs a regularizing action on the rear end of the slab by the action of the lateral correction plate 22 via the hinge rod 26.

[0109] After the alignment is completed, the piston rod of the adjustment cylinder 9 drives the connector 10 to move upward. The conversion body 13 rotates in the opposite direction under the action of the elastic reset body 17. At the same time, the lateral correction plate 22 is driven to gradually approach the frame 1 via the connecting rod 21 and the rotary shaft 24. The rear correction plate 27 moves to the rear side via the hinge rod 26 and moves upward relative to the front correction plate 12. At the same time, the spring will act to keep the front correction plate 12 in contact with the conveying component 7 during this process. This action continues until the guide body 15 is located at the top of the guide groove 16.

[0110] As connector 10 continues to move upward, the last four sets of calibration plates move upward together with connector 10 and reset to their initial state.

[0111] The transfer printing equipment includes an adjusting frame 2 vertically slidably mounted on the top of the frame 1, and the adjusting frame 2 horizontally mounted on the top of the frame 1. An adjusting component 3 is mounted on the adjusting frame 2, which is adapted to vertically adjust the height of the adjusting frame 2. A main embossing roller 6 and a paint roller 5 are mounted on the adjusting frame 2, their surfaces in close contact and rotating synchronously. A power drive unit 4 is mounted on the adjusting frame 2, which is adapted to drive the paint roller 5 to rotate. A vertical guide groove 8 is provided on the side of the frame 1, which is adapted to vertically adjust the height of the paint roller 5 and the main embossing roller 6. The adjusting component 3 is a screw; rotating the adjusting component 3 moves the adjusting frame 2 upwards and simultaneously moves it up and down along the vertical guide groove 8, thus adapting to the transfer of various slabs of different thicknesses.

[0112] The manufacturing process of the finished wood veneer is as follows:

[0113] bleach:

[0114] Add bleaching agents to the bleaching tank. The bleaching agents include sodium percarbonate at a rate of 7-15g per liter and N-[4-triethylammonium methylenebenzoyl]caprolactam chloride at a rate of 25-45g / L per liter. Immerse the two-color wood veneer in the bleaching agent aqueous solution through the conveying component. The temperature in the bleaching tank is 60-80℃. Rinse with distilled water at least twice.

[0115] Coloring: Prepare the dyeing solution and increase the temperature to 60℃ while simultaneously increasing the temperature. The composition and ratio of the dyeing solution are: Acid Red 3.5g / L, Acid Yellow 10g / L, and Acid Blue 3.1g / L. Pour the prepared dyeing solution into the dyeing tank, raise the temperature to 90-100℃, soak for 1-2 hours, remove and dry to obtain the finished wood veneer.

[0116] The process between bleaching and coloring also includes a whitening step, which is as follows:

[0117] Whitening agents are added to the whitening tank. The whitening agents include 1.5 to 3.5 g of sodium persulfate per liter and 0.1 to 0.5 g of activator per liter. The two-color wood veneer is immersed in the whitening agent aqueous solution through the conveying component. The temperature in the bleaching tank is 20 to 35°C. It is washed with distilled water at least twice and then dried in a drying device with the temperature set between 25 and 35 degrees Celsius.

[0118] The wood bleaching and whitening method of this invention has a good bleaching effect on wood and can effectively improve the wood's ability to inhibit light discoloration (yellowing). According to the test, the whiteness of the bleached wood is 84, the corrosion rate of the wood is 0.07%, and it can remain free from yellowing after 15 days in the air. At the same time, the activated carbon can still maintain 80-90% of its original anti-yellowing effect after heat treatment and regeneration.

[0119] The preparation method of the activator includes the following steps:

[0120] First, soak activated carbon in 0.5 mol / L dilute hydrochloric acid at 60℃ for 2 hours. After filtering the sample, slowly add 1 mol / L hydrofluoric acid and soak at 60℃ for 24 hours. Then wash with deionized water until neutral and dry in an oven at 110℃. Next, soak in 10 mol / L HNO3 at 70-90℃ for 10 hours. Filter and wash with deionized water until nearly neutral. Dry in an oven at 110℃ for 10 hours. After removal, heat to 800-900℃ at a rate of 5-10℃ / min under a nitrogen atmosphere of 100 mL / min and hold at that temperature for 30-60 minutes. After cooling, obtain the sample activator.

[0121] The bleached wood has a whiteness of 86, a corrosion rate of 0.06%, and does not yellow after 15 days in the air.

[0122] Example 6: Based on the above examples, the following improvements are made: the coloring process is completed by a veneer conveying mechanism, which includes:

[0123] like Figures 7 to 20 As shown, a conveyor chain 33 is provided, and several sets of support frames 34 are installed on the conveyor chain 33. A veneer clamping structure 35 is installed on the top of each set of support frames 34. A flipping driven structure 37 and a clamping driven structure 39 are installed at the end of the veneer clamping structure 35. A flipping active structure 36 and a clamping active structure 38 are provided on the outside of the conveyor chain 33. The flipping active structure 36 is adapted to drive the flipping driven structure 37 to flip the veneer clamping structure 35. The clamping active structure 38 is adapted to drive the clamping driven structure 39 to clamp or loosen the veneer of the veneer clamping structure 35.

[0124] Among them, the veneer clamping structure 35 is suitable for clamping the veneer from the top and bottom and stretching the veneer to both sides after clamping;

[0125] The conveyor roller 42 has two sets arranged at the top and bottom. The conveyor chain 33 is fitted on the outside of the conveyor roller 42, and the lower conveyor roller 42 is immersed in the dyeing solution.

[0126] The drive unit 40 has a motor drive mechanism installed at the end of the upper conveyor roller 42. The motor is a servo motor and is suitable for providing power to the conveyor roller 42 and the conveyor chain 33. The motor drive mechanism is an intermittent drive mechanism.

[0127] The drive unit 40 drives the conveyor roller 42 via the motor drive mechanism to directionally and intermittently convey the conveyor chain 33 along the conveying direction. The clamping active structure 38 and the clamping driven structure 39 in the process of movement complete the clamping and releasing of the veneer. In conjunction with the veneer clamping structure 35, the veneer is clamped from top to bottom and then stretched to both sides to ensure that the veneer is clamped and fixed stably. With the help of the robot, the automatic loading and unloading of the veneer is completed. The flipping active structure 36 and the flipping driven structure 37 in the process of movement complete the flipping, completing the flipping of the top and bottom surfaces. The dye is cleaned by manual wiping or external cleaning mechanism.

[0128] Example 7: Based on the above example, the following improvements are made: the flipping driven structure 37 includes a rotary shaft 371 rotatably mounted on the support frame 34, a driven plate 372 is mounted on the rotary shaft 371, two symmetrically arranged elastic locking pins 373 are provided on one side of the driven plate 372 relative to the support frame 34, a guide structure 374 is provided on the support frame 34, and two centrally symmetrically arranged guide areas 3741 are provided on the guide structure 374. The depth of the guide areas 3741 gradually decreases along the direction of rotation of the elastic locking pins 373 to drive the rotary shaft 371 to deflect, and a locking groove 3742 suitable for locking the elastic locking pins 373 is provided at the tail of the guide areas 3741.

[0129] A drive plate 361 is installed on the top inner side of the flipping active structure 36. The drive plate 361 is adapted to drive the driven plate 372 to release the locking state of the elastic locking pin 373 and the locking groove 3742.

[0130] The elastic locking pin 373 has a sloping surface on one side along the direction of rotation and a ball head structure on its end face.

[0131] The driven plate 361 acts as a barrier to the driven plate 372 during its movement. It actively applies pressure to force the elastic locking pin 373 to separate from the locking groove 3742, thus unlocking it. The pin then enters the guide area 3741 and moves along the depth difference of the guide area 3741 to another locking groove 3742, completing the flipping process.

[0132] Each veneer clamping structure 35 includes a rotating head 351, which is fixedly installed with a rotating shaft 371. Two symmetrically arranged clamping plates 352 are rotatably mounted on the rotating head 351. A connecting rod 353 is rotatably mounted on the inner side of the two opposing clamping plates 352. A movable block 357 is rotatably mounted on the free end of the connecting rod 353. An elastic telescopic rod 358 is installed between the movable block 357 and the rotating head 351. The included angle between the two sets of connecting rods 353 is an obtuse angle.

[0133] A movable plate 354 is mounted on the inner side of the clamping plate 352 away from the rotating head 351 via a connecting rod assembly. A spring assembly 356 is mounted on each of the two movable plates 354 at opposite positions, and a clamping piece 355 is mounted via the spring assembly 356. The movable plate 354 is suitable for flexibly clamping the veneer from above and below, and then stretching the veneer to both sides. The connecting rod assembly includes two connecting rods: a short rod on one side near the end of the clamping plate 352 and a long rod on the other. The movable plate 354 is suitable for stretching the veneer to both sides after clamping it. The spring assembly 36 consists of three sets of springs arranged at 120° intervals. The top of each spring is mounted on the movable plate 34 near the center, and the bottom is mounted on the clamping piece 35 near the edge.

[0134] The clamping active structure 38 includes a pressure plate 381 located outside the conveyor chain 33 and arranged parallel to the conveying direction;

[0135] The clamping driven structure 39 includes an adjusting rod 391 mounted on the movable block 357. The adjusting rod 391 passes vertically through the rotating head 351 and is adapted to adjust the distance between the movable block 357 and the rotating head 351.

[0136] During the action of the pressure plate 381, the adjusting rod 391 moves linearly towards the wood veneer. The movable block 357 gradually moves away from the rotating head 351, and through the connecting rod 353 and the connecting rod assembly, it drives the clamping plate 352, the movable plate 354, and the clamping piece 355 to release the wood veneer. The free end of the clamping plate 352 is provided with a baffle that limits the deflection angle of the short rod in the connecting rod assembly. The angle between the short rod and the movable plate is an acute angle. With the help of the robot, the wood veneer is removed. The robot will reload new wood veneer. After passing through the action range of the pressure plate 381, the adjusting rod 391 will be reset under the action of the elastic telescopic rod 358 on the movable block 357, completing the upper and lower clamping of the wood veneer. After clamping, it is stretched to both sides to ensure that the wood veneer is in a taut state after clamping, which facilitates the subsequent cleaning work.

[0137] When the locking groove 3742 and the elastic locking pin 373 lock together again, the spring assembly 356 will shake the clamped veneer and the veneer clamping structure 35 to remove the flowing dye.

[0138] A cleaning assembly is provided on the upper side of the conveyor chain 33. The cleaning assembly is suitable for cleaning the surface of the veneer. Two sets of cleaning assemblies and flipping active structures are provided, arranged sequentially along the conveying direction: flipping active structure - cleaning assembly - flipping active structure - cleaning assembly. Each cleaning assembly includes a frame 41, on which a drive motor 411, a drive roller 412, and a belt 413 are installed. Multiple drive rollers 412 are installed on the bottom side of the middle part of the frame 41, and a belt 413 is fitted on the outside of the drive rollers 412. A cleaning plate 414 is installed on the belt 413. The drive motor 411 is installed on the top of the frame 41 and is suitable for driving the drive rollers 412 to rotate. The frame 41 spans across the conveyor chain 33. After flipping, the drive motor 411 on the cleaning assembly drives the drive rollers 412 and the cleaning plate 414 via the belt 413 to clean the upper surface of the veneer. After flipping again, the cleaning plate 414 cleans the lower surface of the veneer, thus completing the double-sided cleaning work.

[0139] Example 8: Unlike the above examples, the elastic locking pin 373 does not have a sloping surface on one side along the rotation direction and a ball head structure on the end face. The reason is that if a forced unlocking state is adopted, although a certain degree of vibration force can be guaranteed, the wear is greater and it is not conducive to long-term use.

[0140] The elastic locking pin 373 includes a pin body 3731 that penetrates the driven plate 372. The driven plate 372 is provided with a T-shaped groove 3732. The T-shaped groove 3732 is suitable for installing the pin body 3731 and the spring. The pin body 3731 penetrates the T-shaped groove 3732 and the spring and is partially exposed on the outside of the driven plate 372. An external hook portion 3733 is provided on the outside of the driven plate 372.

[0141] The top inner side of the drive plate 361 is provided with a socket structure 3611 and a blocking structure 3612 arranged facing the conveying direction. The socket structure 3611 is adapted to gradually insert into the area between the outer hook portion 3733 and the driven plate 372 facing the conveying direction, and pushes the outer hook portion 3733 to force the pin 3731 to separate from the locking groove 3742. The blocking structure 3612 is adapted to drive the driven plate 372 to rotate after the pin 3731 and the locking groove 3742 are separated. The thickness of the facing side of the socket structure 3611 gradually increases along the length direction, so that the outer hook portion 3733 can be gradually pulled outward, thereby gradually completing the unlocking action. The spring return delay is used to deflect the driven plate 372 in the first moment through the blocking structure 3612. After the unlocking is completed, the blocking structure 3612 deflects the driven plate 372 through the guide structure 374 until it is locked with another locking groove 3742.

[0142] The specific coloring steps are as follows:

[0143] Wood veneer application:

[0144] The robotic arm feeds the bleached wood veneer to the veneer clamping structure 35, which is in a relaxed state. The conveyor chain 33 is driven by the drive unit 40 to convey the veneer along the conveying direction. The pressure plate 381 will lose its pressure on the adjusting rod 391, and the adjusting rod 391 will be released. The movable block 357 will be reset under the action of the elastic telescopic rod 358, which will drive the connecting rod 353 to deflect to the center. During the deflection, the clamping plate 355 will clamp the wood veneer first. As the deflection continues, the movable plate 354 will be moved to both sides through the connecting rod assembly, completing the action of the clamping plate 355 to stretch the wood veneer to both sides. The robotic arm conveys the wood veneer to the veneer clamping structure 35 at the same speed along the conveying direction. After the wood veneer is clamped, it is removed.

[0145] Veneer staining:

[0146] It then gradually enters the dyeing solution for immersion and staining.

[0147] Veneer resurfacing:

[0148] As the conveyor chain 33 conveys, the two outer hooks 3733 on the driven plate 372 gradually approach the socket structure 3611 on the drive plate 361. The socket structure 3611 gradually enters between the two outer hooks 3733 and pushes the outer hooks 3733 outward, forcing the pin 3731 and the locking groove 3742 to separate. After separation, the blocking structure 3612 contacts the driven plate 372. The driven plate 372 deflects under the blocking action of the blocking structure 3612. The pin 3731 enters the guide area 3741 and automatically enters the locking groove 3742 at the end along the guide area 3741 to re-lock with the pin 3731. The clamping plate 355 drives the veneer to shake under the action of the spring assembly 356, shaking off excess dye on the edge and the veneer clamping structure 35.

[0149] Wood veneer cleaning:

[0150] The wood veneer first passes through a set of cleaning components. The drive motor 411 drives the drive roller 412, belt 413 and cleaning plate 414 to clean the dye on the upper surface of the wood veneer. Then it passes through a set of flipping active structure 36, and the flipping driven structure 37 completes the flipping. The lower surface is adjusted to correspond with the position of another set of cleaning components, and the lower surface dye is cleaned by the other set of cleaning components, thus completing the double-sided cleaning of the wood veneer.

[0151] Wood veneer cutting:

[0152] The robotic arm first fixes the veneer and transports it along with the veneer. The pressure plate 381 will act on the adjusting rod 391 to move the movable block 357 away from the rotating head 351, causing the connecting rod 353 to deflect to both sides. During the deflection, the clamping plate 355 first holds the veneer, and the connecting rod assembly moves the movable plate 354 to the center to loosen the veneer. As the deflection continues, the clamping plate 355 completely releases the veneer. After the robotic arm removes the veneer, it reloads the veneer to the veneer clamping structure 35 to complete the reloading action and then moves it away.

[0153] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made to the technical solutions and inventive concepts of the present invention should all be covered within the scope of protection of the present invention.

Claims

1. A formaldehyde-removing environmentally friendly board production device, characterized in that, Includes calibration components and transfer equipment; The straightening assembly completes the straightening process of the front, side and rear ends of multiple slabs together; The correction assembly includes a frame, a conveying assembly installed below the frame, the conveying assembly being adapted to rotate at the same speed as the paint roller, a trimming drive cylinder installed on the frame above the conveying assembly, and a connector installed at the end of the trimming drive cylinder, the connector being located on the lower side of the frame. The bottom end of the connector is equipped with a front correction plate via a horizontal bar. A vertical bar runs vertically through the free end of the horizontal bar. A spring is fitted on the outside of the vertical bar and is located between the horizontal bar and the front correction plate. A retaining ring is provided at the top of the vertical bar and is located at the top of the horizontal bar. The connector is fitted with a converter body on its outer side. The connector is provided with a fixing ring located inside the converter body. A guide body is installed on the fixing ring. A guide groove is provided on the side of the converter body. The guide body and the guide groove are adapted to drive the converter body to move vertically and rotate circumferentially relative to the connector. An elastic reset body is provided between the bottom of the fixed ring and the conversion body. The elastic reset body is suitable for the vertical movement of the conversion body relative to the connector. The outer side of the converter is fitted with a guide sleeve, and the two can rotate relative to each other and slide circumferentially. The guide sleeve is installed on the lower surface of the frame via a connecting frame. A supporting frustum is provided at the bottom of the guide sleeve. A limit ring is movably installed inside the supporting frustum, and the limit ring is fixed to the outside of the connector. The top of the converter is connected to a connecting rod via a hinge shaft. There are two sets of connecting rods arranged in a centrally symmetrical manner. The free end of the connecting rod is connected to a lateral correction plate via a rotary shaft. The connecting rod moves up and down relative to the lateral correction plate, and a baffle is provided on the top of the rotary shaft. A guide rod is provided on the side of the lateral correction plate opposite to the frame, and the guide rod is perpendicularly inserted into the side of the frame. A hinge rod is installed on the inner side of the end of the lateral correction plate away from the front correction plate. A rear correction plate is installed on the free end of the hinge rod. The rear correction plate is adapted to gradually move closer to the front correction plate when the lateral correction plates approach each other. The bottom of the front correction plate, rear correction plate, and lateral correction plate are all equipped with omnidirectional ball structures. The bottom of the converter is provided with multiple rolling elements arranged circumferentially. The transfer printing equipment includes an adjustment frame that is vertically slidably mounted on the top of the frame and horizontally mounted on the top of the frame. The adjustment frame is equipped with an adjustment component that is suitable for vertically adjusting the height of the adjustment frame. The adjustment frame is equipped with a main embossing roller and a paint roller. The surfaces of the main embossing roller and the paint roller are in close contact and rotate synchronously. The adjustment frame is equipped with a power drive unit that is suitable for driving the paint roller to rotate. A vertical guide groove is provided on the side of the frame that is suitable for vertically adjusting the height of the paint roller and the main embossing roller.

2. The formaldehyde-removing environmentally friendly board production device according to claim 1, characterized in that, The specific steps for the correction component to correct the slab are as follows: A position sensor is pre-installed on the inner side of the frame to collect slab signals. When the slab signal is detected, the trimming drive cylinder is started. The piston rod of the trimming drive cylinder drives the connector to move downward. At this time, the connector, the converter, the front correction plate, the side correction plate and the rear correction plate move downward together. The converter moves vertically downward along the guide sleeve. The front correction plate will contact the conveying assembly first. The front correction plate aligns and straightens the front ends of multiple slabs. The trimming drive cylinder stops working. When the position sensor detects the disappearance of the slab signal, the adjustment drive cylinder is restarted. The fixed ring and the guide on it will move vertically downward along the upper half of the guide groove. The horizontal bar will compress the spring and move downward relative to the front correction plate. At the same time, the side correction plate and the rear correction plate move downward together and contact the conveying assembly. As the connector continues to descend, the guide body enters the lower half of the guide groove, and the conversion body will rotate. The conversion body drives the lateral correction plate to move in a straight line along the length of the guide rod towards the center via the connecting rod. At the same time, the rear correction plate performs a regularizing action on the rear end of the slab by the lateral correction plate through the hinge rod. After the alignment is completed, the piston rod of the adjustment drive cylinder drives the connector head to move upward. The conversion body rotates in the opposite direction under the action of the elastic reset body. At the same time, the lateral correction plate is driven to gradually approach the frame through the connecting rod and the rotary shaft. The rear correction plate moves to the rear side through the hinge rod and moves upward relative to the front correction plate. At the same time, the spring will act to keep the front correction plate in contact with the conveying component during this process. This action continues until the guide body is at the top of the guide groove. As the connector continues to move upward, the front correction plate, the lateral correction plate, and the rear correction plate eventually return to their initial state along with the connector.

Images