Fiber crosslinking enhanced medium density fiberboard

Abstract

The invention relates to the technical field of fiberboards, in particular to a fiber crosslinking enhanced medium-density fiberboard which comprises a main body unit, an enhancing unit, a connecting mechanism I arranged on a fiberboard I and a connecting mechanism II arranged on a fiberboard II, the reinforcing mechanism is arranged on the first connecting mechanism and the second connecting mechanism and used for improving the connecting strength of the first fiberboard and the second fiberboard. The connecting mechanism and the reinforcing mechanism are integrated on the butt joint face of the fiberboard, so that installation operation is simplified, assembling efficiency can be effectively improved, damage to the internal fiber structure of the board due to fixing modes such as trepanning is avoided, the overall strength of the board is guaranteed, meanwhile, material overflow can be avoided, the later cleaning cost is reduced, and the subsequent secondary machining effect is not affected; the elasticity of the foaming adhesive can play a corresponding role in buffering vibration and temperature stress, meanwhile, the periphery of the top plate is sealed in a matched mode, a double-damp-proof barrier is formed, moisture invasion is effectively blocked, and the service life of the plate can be further prolonged.

Description

Technical Field

[0001] This invention relates to the field of fiberboard technology, and more specifically to a fiber cross-linked reinforced medium-density fiberboard. Background Technology

[0002] Fiberboard, a type of board made from wood fiber or other plant fibers, has become one of the core materials in the modern building materials and home furnishing industry. Among them, medium-density fiberboard (MDF) is often used in custom furniture and decorative components such as wall panels and background wall substrates in interior decoration due to its moderate density and balanced mechanical properties. In the actual construction and production assembly process, the connection and fixing of MDF is a key link. Generally, adhesive bonding is used, which involves applying white glue, nail-free glue, or other adhesives to the mating surfaces of two fiberboards and relying on the bonding effect of the adhesive to achieve fixation. Alternatively, metal nails or screws can be driven in after drilling, or corner brackets, buckles, and other connectors can be used for locking and fixing. However, the installation process using adhesive bonding and metal fasteners is relatively cumbersome, requiring clamps for positioning, which affects installation efficiency. Furthermore, adhesive easily overflows from the joints onto the fiberboard surface, making cleaning difficult and often leaving residue. Metal fasteners are also easily exposed on the fiberboard surface, affecting its flatness and aesthetics, and even impacting subsequent painting and lamination. The significant material difference between metal fasteners and fiberboard can lead to loosening due to temperature changes and vibrations over time. Metal parts are also prone to corrosion. Using screws and nails may require additional drilling into the fiberboard, affecting connection strength and damaging the internal fiber structure, leading to localized strength loss, especially at the edges, where cracking and breakage are likely, impacting the fiberboard's lifespan. In view of this, we propose a fiber cross-linked reinforced medium density fiberboard. Summary of the Invention

[0003] To address the aforementioned shortcomings of existing technologies, this invention provides a fiber cross-linked reinforced medium-density fiberboard (MDF) that effectively solves the problems associated with existing technologies that use adhesive bonding or metal connections. These problems include cumbersome installation, low efficiency, easy glue overflow and residue, exposed metal parts affecting aesthetics and secondary processing, and metal parts being prone to loosening and corrosion, as well as opening holes that damage the board structure, leading to reduced strength and shortened service life.

[0004] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a fiber cross-linked reinforced medium-density fiberboard (MDF), comprising a main unit including a first fiberboard and a second fiberboard disposed on one side of the first fiberboard, including... The reinforcing unit includes a first connecting mechanism disposed on a first fiberboard and a second connecting mechanism disposed on a second fiberboard. The first connecting mechanism and the second connecting mechanism are used for quick connection and installation of the first fiberboard and the second fiberboard, and the first connecting mechanism and the second connecting mechanism are used for reinforcing mechanisms to improve the connection strength of the first fiberboard and the second fiberboard.

[0005] Furthermore, the connecting mechanism includes a top plate fixedly connected to the fiberboard one near the fiberboard two, and a trapezoidal block fixedly connected to the bottom of the top plate.

[0006] Furthermore, storage grooves are provided on both sides of the trapezoidal block, and elastic barbed plates are fixedly connected to the inner wall of the storage grooves.

[0007] Furthermore, the second connecting mechanism includes a positioning groove and a trapezoidal groove opened on the side of the second fiberboard close to the first fiberboard. The positioning groove and the trapezoidal groove are interconnected and are used to engage with the top plate and the trapezoidal block, respectively.

[0008] Furthermore, the inner wall of the trapezoidal groove is provided with a hook groove, which is used to engage with the elastic barb plate.

[0009] Furthermore, the reinforcing mechanism includes a conical groove formed on the inner wall of the trapezoidal groove, and a thin film capsule is fixedly connected to the inner wall of the conical groove.

[0010] Furthermore, a tapered rod is provided above the first membrane capsule for interlocking with the tapered groove. The top of the tapered rod is fixedly connected to the bottom of the trapezoidal block, and a threaded guide groove is provided on the surface of the tapered rod.

[0011] Furthermore, the reinforcing mechanism also includes a second thin film capsule fixedly connected to the inner wall of the hook groove. A spike is provided below the second thin film capsule, and one end of the spike is fixedly connected to the side of the elastic barb plate away from the receiving groove.

[0012] Furthermore, the first membrane capsule is made of polyvinyl alcohol film, and the interior of the first membrane capsule is filled with a two-component polyurethane foam adhesive.

[0013] Furthermore, the second membrane capsule is made of thin nylon film, and the interior of the second membrane capsule is filled with epoxy-based structural adhesive.

[0014] The technical solution provided by this invention has the following advantages compared with known public technologies: This invention integrates the connecting mechanism and the reinforcing mechanism on the fiberboard mating surface. By utilizing the precise fit between the top plate and the positioning groove, and the trapezoidal block and the trapezoidal groove, combined with the mechanical locking of the elastic barbed plate and the hook groove, a quick connection can be completed simply by aligning and pressing without the need for additional tools and clamps. This simplifies the installation operation, effectively improves assembly efficiency, and avoids damage to the internal fiber structure of the board caused by fixing methods such as drilling holes, thus ensuring the overall strength of the board. The tight fit between the top plate and the positioning groove forms an anti-overflow seal. Combined with the guiding effect of the threaded guide groove on the adhesive, the foamed adhesive and structural adhesive released by the double bladders fill only inside the connection, thus avoiding material overflow, reducing later cleaning costs, ensuring that the surface of the board is flat and clean, and not affecting the effect of subsequent secondary processing. By combining the mechanical locking of the elastic barbed plates, the rigid bonding of the epoxy structural adhesive, and the seamless filling of the polyurethane foam adhesive, a multi-layered reinforcement system is formed, significantly enhancing the static bending strength and pull-out resistance of the connection points. Furthermore, the elasticity of the foam adhesive can buffer vibration and temperature stress, further extending the durability of the connection structure and the service life of the panels. In conjunction with the outer perimeter sealing of the top plate, a double moisture barrier is formed, effectively preventing moisture intrusion and enhancing the moisture resistance of the panels, thereby further improving their service life. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the disassembly structure of fiberboard one and fiberboard two of the present invention; Figure 3 For the present invention Figure 2 Enlarged schematic diagram of structure A; Figure 4 These are cross-sectional views of fiberboard one and fiberboard two of the present invention; Figure 5 This is a schematic diagram of the reinforcement unit structure of the present invention; Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure at point B; Figure 7 This is a schematic diagram of the connection mechanism one and connection mechanism two of the present invention; Figure 8 For the present invention Figure 7 A magnified schematic diagram of the structure at point C.

[0017] The labels in the diagram represent: 100, main unit; 101, fiberboard one; 102, fiberboard two; 200. Reinforcing unit; 201. Connecting mechanism one; 2011. Top plate; 2012. Trapezoidal block; 2013. Storage slot; 2014. Elastic barb plate; 202. Connecting mechanism two; 2021. Positioning slot; 2022. Trapezoidal groove; 2023. Hook groove; 203. Reinforcing mechanism; 2031. Conical groove; 2032. Membrane capsule one; 2033. Conical rod; 2034. Threaded guide groove; 2035. Membrane capsule two; 2036. Spike. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] The present invention will be further described below with reference to embodiments.

[0020] like Figures 1 to 8 As shown, a fiber cross-linked reinforced medium-density fiberboard includes a main unit 100, comprising a first fiberboard 101 and a second fiberboard 102 disposed on one side of the first fiberboard 101. A reinforcement unit 200 includes a first connecting mechanism 201 disposed on the first fiberboard 101 and a second connecting mechanism 202 disposed on the second fiberboard 102. The first connecting mechanism 201 and the second connecting mechanism 202 are used for quick connection and installation of the first fiberboard 101 and the second fiberboard 102, and reinforcement mechanisms 202 disposed on the first connecting mechanism 201 and the second connecting mechanism 202 are used to improve the connection strength between the first fiberboard 101 and the second fiberboard 102. 3; Both fiberboard 101 and fiberboard 202 are made of fiber cross-linked reinforced medium density fiberboard substrate. The internal wood fibers form a three-dimensional covalent cross-linked network through polyamide cross-linking agent, which enhances the static bending strength under normal conditions and meets the basic strength requirements in humid and high temperature scenarios. The reinforcing unit 200 is integrated into the mating surface of the main unit 100 and consists of connecting mechanism 1 201, connecting mechanism 2 202 and reinforcing mechanism 203. The reinforcing mechanism 203 is respectively embedded in the corresponding positions of connecting mechanism 1 201 and connecting mechanism 2 202. Through their coordinated use, fiberboard 101 and fiberboard 2 102 can be quickly connected and the connection strength can be enhanced. Specifically, the connecting mechanism 201 includes a top plate 2011 fixedly connected to the side of fiberboard 101 near fiberboard 202. A trapezoidal block 2012 is fixedly connected to the bottom of the top plate 2011. Both sides of the trapezoidal block 2012 are provided with storage grooves 2013. An elastic barbed plate 2014 is fixedly connected to the inner wall of the storage groove 2013. The top plate 2011 is a rectangular plate structure with a thickness of 2-3mm. It is fixedly connected to the side of fiberboard 101 near fiberboard 202 by cross-linked adhesive. The connecting surfaces fit together without gaps and have good bonding strength. The trapezoidal block 2012 is located at the bottom of the top plate 2011 and is integrally formed with the top plate 2011. Its cross-section is an isosceles trapezoid. The width of the upper base is the same as the width of the top plate 2011, and the width of the lower base is 3-5mm narrower than the upper base. The angle between the inclined side and the vertical direction is 15-20°, which facilitates guidance and positioning when inserted into the trapezoidal groove 2022. It should be noted that the trapezoidal block 2012 has symmetrically provided storage grooves 2013 on both sides. The storage grooves 2013 are rectangular grooves with a depth of 1-1.5mm and a length consistent with the height of the trapezoidal block 2012. The inner wall of the storage groove 2013 is fixedly connected with an elastic barb plate 2014 by hot melt adhesive. The elastic barb plate 2014 is made of polyurethane elastic material with a thickness of 0.3-0.5mm. In its natural state, it is in an elastically open state with an outward tilt. The tilt angle is adapted to the side angle of the trapezoidal block 2012. When compressed, it can be completely stored in the storage groove 2013 and can quickly rebound after the pressure is released. Specifically, the connecting mechanism 202 includes a positioning groove 2021 and a trapezoidal groove 2022 opened on the side of the fiberboard 2 102 near the fiberboard 1 101. The positioning groove 2021 and the trapezoidal groove 2022 are interconnected. The positioning groove 2021 and the trapezoidal groove 2022 are respectively used to engage with the top plate 2011 and the trapezoidal block 2012. The inner wall of the trapezoidal groove 2022 is provided with a hook groove 2023, which is used to engage with the elastic barbed plate 2014. The positioning groove 2021 and the trapezoidal groove 2022 are both opened on the side of the fiberboard 2 102 near the fiberboard 1 101 and are interconnected to form a stepped groove structure. It should be noted that the positioning groove 2021 is located on the outside, and its shape and size are completely matched with the top plate 2011. Its depth is consistent with the thickness of the top plate 2011, ensuring that the top plate 2011 can be completely inserted into the positioning groove 2021 to achieve a flush fit between the mating surfaces. The trapezoidal groove 2022 is located inside the positioning groove 2021 and is coaxially set with the positioning groove 2021. Its cross-sectional shape and size are adapted to the trapezoidal block 2012. The inner walls on both sides of the trapezoidal groove 2022 are provided with hook grooves 2023 corresponding to the positions of the elastic barb plate 2014. The hook grooves 2023 are inclined slots with a length consistent with the length of the elastic barb plate 2014. When the elastic barb plate 2014 rebounds, the end of the elastic barb plate 2014 can be accurately inserted into the hook grooves 2023 to form a mechanical locking structure, thereby achieving the initial fixation of fiberboard 101 and fiberboard 202. Specifically, the reinforcing mechanism 203 includes a conical groove 2031 formed on the inner wall of the trapezoidal groove 2022. A first film capsule 2032 is fixedly connected to the inner wall of the conical groove 2031. A conical rod 2033 is provided above the first film capsule 2032 for interlocking with the conical groove 2031. The top of the conical rod 2033 is fixedly connected to the bottom of the trapezoidal block 2012. A threaded guide groove 2034 is formed on the surface of the conical rod 2033. The reinforcing mechanism 203 also includes a second film capsule 2035 fixedly connected to the inner wall of the hook groove 2023. A spike 2036 is provided below the second film capsule 2035. One end of the spike 2036 is fixedly connected to the side of the elastic barb plate 2014 away from the receiving groove 2013. The first film capsule 2032 is made of polyvinyl alcohol film, and the first film capsule 2032... 32. The interior is filled with a two-component polyurethane foam adhesive. The second film capsule 2035 is made of thin nylon film and is filled with epoxy structural adhesive. The conical groove 2031 is opened at the bottom of the inner wall of the trapezoidal groove 2022. It has a conical structure with the same taper as the conical rod 2033 and a depth of 3-5mm. The inner wall is sanded to ensure smoothness. The first film capsule 2032 is made of polyvinyl alcohol film with a thickness of 0.05-0.1mm. It has a spherical capsule structure and is fixed to the bottom of the inner wall of the conical groove 2031 by adhesive. The interior is filled with a two-component polyurethane foam adhesive. The main component isocyanate and the curing agent polyol are encapsulated in a 1:1 ratio. The foaming ratio of this adhesive is 3-5 times and the curing time is 5-10 minutes. After curing, it has both adhesiveness and elasticity. It should be noted that the tapered rod 2033 is a solid conical structure made of rigid plastic. Its top is fixedly connected to the bottom of the trapezoidal block 2012 through injection molding. It is coaxially positioned at the center of the trapezoidal block 2012. The taper is adapted to the tapered groove 2031, and its length is 0.5-1mm longer than the depth of the tapered groove 2031 to ensure that it can accurately pierce the membrane capsule 2032 when inserted. The surface of the tapered rod 2033 is provided with a threaded guide groove 2034. The threaded guide groove 2034 is a continuous spiral groove with a groove width of 0.5-0.8mm and a groove depth of 0.3-0.5mm, which is used to guide the flow and filling of foam adhesive and structural adhesive. It should also be noted that the second membrane capsule 2035 is made of thin nylon film with a thickness of 0.03-0.05mm, and has a flat capsule structure. It is fixedly connected to the inner wall of the hook groove 2023 and filled with epoxy structural adhesive. The volume expansion rate of the structural adhesive during curing is ≤5%, the curing time is 8-15min, and the hardness and bonding strength are high after curing. The spike 2036 is made of stainless steel with a diameter of 0.2-0.3mm. One end is fixedly connected to the side of the elastic barb plate 2014 away from the receiving groove 2013 by welding process, with the tip facing the second membrane capsule 2035. When the elastic barb plate 2014 is inserted into the hook groove 2023, the spike 2036 can accurately pierce the second membrane capsule 2035 and release the epoxy structural adhesive inside.

[0021] The working principle of this invention: In the initial stage of assembly, when the operator aligns the connecting mechanism 201 of fiberboard 101 with the connecting mechanism 202 of fiberboard 102, the top plate 2011 first contacts the positioning groove 2021. The top plate 2011 is a rectangular plate structure, and its length and width are completely matched with the positioning groove 2021. Its thickness of 2-3mm is consistent with the depth of the positioning groove 2021, so that the top plate 2011 can be quickly embedded into the positioning groove 2021 to form a preliminary locking and positioning. The surface positioning of the top plate 2011 expands the contact area, avoids lateral displacement or twisting of the fiberboard during the docking process, and has higher positioning accuracy. Meanwhile, after the top plate 2011 is embedded in the positioning groove 2021, its edge fits tightly with the inner wall of the positioning groove 2021, forming a sealing edge, which seals the outer peripheral gap between the connecting mechanism 1 201 and the connecting mechanism 202 in advance, setting an overflow barrier for the subsequent release of the capsule material, preventing the material from overflowing from the edge of the mating surface to the fiberboard surface, ensuring the clean appearance of the board, and avoiding the inconvenience of cleaning adhesive materials after the board is installed; The top plate 2011 provides auxiliary pressing and anti-overflow reinforcement. When axial pressure is applied, the top plate 2011 becomes the force carrier for the operator. Since the surface of the top plate 2011 is flat and flush with the outer surface of the fiberboard 101, the operator can directly press the area of ​​the top plate 2011. The pressure is evenly transmitted to the trapezoidal block 2012 below through the top plate 2011, avoiding tilting or jamming of the trapezoidal block 2012 due to the offset of the pressing position. The large force-bearing surface design of the top plate 2011 makes the installation operation more convenient and the pressing action less strenuous, further improving the ease of installation. As pressure continues to be applied, the trapezoidal block 2012 goes deeper into the trapezoidal groove 2022, and the top plate 2011 gradually comes into complete contact with the bottom of the positioning groove 2021. At this time, the top plate 2011 and the positioning groove 2021 are completely in contact, and the sealing edge on the outer periphery is further compacted, blocking the passage between the inside of the connecting mechanism and the outside. At the same time, the elastic barbs 2014 on both sides of the trapezoidal block 2012 are compressed and contracted into the storage groove 2013. After the trapezoidal block 2012 is fully in place, the elastic barbs 2014 spring back and lock into the hook groove 2023, forming a mechanical lock, realizing the initial fixation of fiberboard 101 and fiberboard 202. At this time, the locking structure of the top plate 2011 not only ensures the stability of the initial fixation; At the instant the elastic barbed plate 2014 is engaged with the hook groove 2023, the spike 2036 pierces the membrane capsule 2035, and the epoxy structural adhesive inside flows out and fills the gap between the elastic barbed plate 2014 and the hook groove 2023. Since the top plate 2011 and the positioning groove 2021 have formed a seal, the structural adhesive can only flow in the hook groove 2023 and cannot overflow to the surface of the plate. At the same time, the structural adhesive cures quickly, and the shear strength is enhanced after curing, which firmly bonds the elastic barbed plate 2014 and the hook groove 2023, further improving the shear resistance of the mechanical locking and avoiding loosening after initial fixation. Simultaneously, the tapered rod 2033 at the bottom of the trapezoidal block 2012 is inserted into the tapered groove 2031, piercing the membrane capsule 2032. The two-component polyurethane foam adhesive flows upward along the threaded guide groove 2034. The spiral structure of the threaded guide groove 2034 guides the adhesive to accurately fill the gaps between the tapered rod 2033 and the tapered groove 2031, and between the trapezoidal block 2012 and the trapezoidal groove 2022. The sealing structure of the top plate 2011 and the positioning groove 2021 forms a top overflow prevention boundary, so that the adhesive can only expand and fill inside the connecting mechanism and will not overflow from the top. This avoids the problem of foam material overflow, ensures that there are no glue marks on the surface of the fiberboard, and reduces the time and cost of cleaning the surface of the fiberboard later. In addition, the foamed adhesive, after curing, combines adhesion and elasticity. On the one hand, it works in conjunction with the interlocking structure of the top plate 2011 to form a triple reinforcement of mechanical locking, adhesive fixation, and surface sealing, thereby improving the static bending strength and pull-out resistance of the connection. On the other hand, its elastic properties can buffer vibration and temperature stress, and together with the rigid support of the top plate 2011, further improve the durability of the connection. Moreover, after the adhesive fills all gaps, it forms an internal sealing layer, which works in conjunction with the outer circumferential seal of the top plate 2011 to simultaneously improve the moisture-proof performance of the connection.

[0022] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fiber cross-linking reinforced medium density fiberboard comprising a main unit (100) including a fiberboard one (101), and a fiberboard two (102) provided at one side of the fiberboard one (101), characterized in that, The application relates to a reinforced unit (200) for fiber plates. The connecting mechanism one (201) comprises a top plate (2011) fixedly connected to one side of the fiber plate one (101) close to the fiber plate two (102), and the bottom of the top plate (2011) is fixedly connected with a trapezoidal block (2012).

2. The fiber cross-linked reinforced medium density fiberboard according to claim 1, wherein, The trapezoidal block (2012) is provided with receiving grooves (2013) on both sides, and the inner walls of the receiving grooves (2013) are fixedly connected with elastic barb plates (2014).

3. A cross-linked fiber reinforced medium density fiberboard according to claim 2, characterized in that, The connecting mechanism two (202) comprises a positioning groove (2021) and a trapezoidal groove (2022) formed on one side of the fiber plate two (102) close to the fiber plate one (101), the positioning groove (2021) and the trapezoidal groove (2022) are mutually penetrated, and the positioning groove (2021) and the trapezoidal groove (2022) are respectively used for clamping the top plate (2011) and the trapezoidal block (2012).

4. The fiber cross-linked reinforced medium density fiberboard according to claim 1, wherein, The inner wall of the trapezoidal groove (2022) is provided with a hook groove (2023) used for clamping the elastic barb plate (2014).

5. A fiber cross-linked enhanced medium density fiberboard according to claim 4, characterized in that, The reinforcing mechanism (203) comprises a tapered groove (2031) formed in the inner wall of the trapezoidal groove (2022), and the inner wall of the tapered groove (2031) is fixedly connected with a film capsule one (2032).

6. The fiber cross-linked reinforced medium density fiberboard according to claim 1, wherein, A tapered rod (2033) used for plug-in cooperation with the tapered groove (2031) is arranged above the film capsule one (2032), the top of the tapered rod (2033) is fixedly connected to the bottom of the trapezoidal block (2012), and a threaded guide groove (2034) is formed in the surface of the tapered rod (2033).

7. A cross-linked enhanced medium density fibreboard according to claim 6, characterized in that, The reinforcing mechanism (203) further comprises a film capsule two (2035) fixedly connected to the inner wall of the hook groove (2023), and a sharp (2036) is arranged below the film capsule two (2035), one end of the sharp (2036) is fixedly connected to the side of the elastic barb plate (2014) away from the receiving groove (2013).

8. The fiber cross-linked reinforced medium density fiberboard according to claim 5, wherein, The film capsule one (2032) is made of polyvinyl alcohol film, and the film capsule one (2032) is filled with double-component polyurethane foaming adhesive.

9. The fiber cross-linked reinforced medium density fiberboard according to claim 6, wherein, The film capsule two (2035) is made of thin nylon film, and the film capsule two (2035) is filled with epoxy-based structural adhesive.

10. The fiber cross-linked reinforced medium density fiberboard according to claim 8, wherein, ​

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