Jute fiber hard board and manufacturing method thereof

Abstract

The invention relates to the technical field of biological material treatment, and discloses a jute fiber hard board and a manufacturing method thereof, and the manufacturing method comprises the following steps: step a, purchasing jute raw materials; step b, cutting treatment; c, mechanical treatment; step d, microwave shaping; e, hot-pressing and positioning the mesh bag; step f, pre-pressing and forming; step g; step h, hot pressing process; step i, corner cutting; the jute fiber hard board is manufactured through the manufacturing method. In the invention, aiming at the problem that the jute fiber board is easy to swell and deform in a humid environment, environment-friendly glue is adopted for veneer gluing treatment in the pre-pressing forming stage, so that the waterproof performance of the board is effectively enhanced; meanwhile, by optimizing the hot pressing process, tight combination of multiple layers of plates is further ensured, the possibility of moisture permeation is reduced, and on the basis of original high strength, wear resistance and corrosion resistance, the stability of the plates in a humid environment is remarkably improved, and the service life of the plates in a humid environment is remarkably prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of biological material processing, in particular to a jute fiber hardboard and a manufacturing method thereof. Background Art

[0002] As a natural fiber, jute has received extensive attention and application in recent years due to its excellent performance and environmental protection characteristics. Jute fiber not only has high strength, wear resistance, corrosion resistance and other characteristics, but also has good air permeability and moisture absorption, which makes it have great application potential in many fields such as construction, furniture, packaging, etc., especially in the manufacture of hard board materials, the use of jute fiber can not only provide high-quality physical properties, but also achieve the goals of environmental protection and sustainable development.

[0003] After searching, the Chinese patent number CN104802277B discloses a method for preparing a jute reinforced tannin resin medium density fiberboard, which is characterized by comprising: step 1: chopping the jute fibers and feeding them into an opener for opening; feeding the opened fibers into an air-laid machine to obtain a fiber web by air-laid formation; and reinforcing the jute non-woven material by needle punching; step 2: adding a urotropine aqueous solution to a tannin aqueous solution and stirring to obtain a tannin resin; step 3: sealing the jute non-woven material into a mold, pouring tannin resin until the jute non-woven material is completely soaked, taking it out of the mold, drying it in the shade, and molding it with a flat vulcanizer to obtain a jute reinforced tannin resin medium density fiberboard. The invention has the characteristics of being pure natural, free of formaldehyde release, short processing cycle, light weight, considerable strength, stable size, corrosion resistance, and low cost.

[0004] The above-mentioned preparation method adopts the phloem fiber after degumming of natural jute or ramie as raw material, makes hemp felt as the skeleton of the board through linen and hemp fiber, and then impregnates the linen or hemp fiber with phenolic glue or silicone-modified phenolic glue, and makes the board through hot pressing. Although it has the characteristics of high strength and wear resistance, there are still some problems in practical application. Due to the complex overall manufacturing process, high production cost and relatively high requirements for raw materials, its application in large-scale production is subject to certain restrictions; in addition, the jute fiber board has poor stability in a humid environment and is prone to expansion and deformation, which also limits its application in certain specific fields. Based on this, the present invention designs a jute fiber hardboard and a preparation method thereof to solve the above-mentioned problems. Summary of the invention

[0005] The purpose of the present invention is to provide a jute fiber hardboard and a manufacturing method thereof, which solves the problems of complex process and easy expansion and deformation in the background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A method for making a jute fiber hardboard comprises the following steps:

[0008] Step a. Purchase jute raw materials, select dry, mildew-free, and impurity-free jute fibers as raw materials;

[0009] Step b. cutting, cutting the purchased jute raw materials into jute fiber segments of predetermined sizes to ensure uniform fiber length;

[0010] Step c. Mechanical treatment, placing in a machine with stirring, combing and acupuncture functions for further processing;

[0011] Step d. Microwave shaping, sending the needle-punched jute fiberboard into a microwave drying device, and shaping the fiber through microwave heating;

[0012] Step e. The mesh bag is hot-pressed to position the jute fiberboard after shaping, and the jute fiberboard is laid flat on the mesh bag device. The thickness positioning and size cutting of the hardboard are performed through the positioning function of the mesh bag device;

[0013] Step f. Pre-pressing, the jute fiberboard after positioning is sent to the hot pressing equipment for pre-pressing to further tightly bond the hardboard;

[0014] Step g. Gluing, the pre-pressed jute fiberboard is sent to the gluing equipment for veneer gluing;

[0015] Step h. hot pressing process, feeding the pre-pressed multi-layer jute board into a hot pressing device for hot pressing process;

[0016] Step i. Edge cutting: the hot-pressed jute fiber hardboard is fed into a push saw device to cut off the edges and corners to ensure the dimensional accuracy and appearance quality of the hardboard;

[0017] A jute fiber hardboard is made by the above-mentioned manufacturing method, and the hardboard is mainly composed of the following material components:

[0018] Jute fiber, as the main structural material, with a content of not less than 70% by weight, preferably bast fiber, to enhance the strength and durability of the board;

[0019] Functional additives, including flame retardants and anti-aging agents, with a total content not exceeding 10% of the total weight, to enhance the fire resistance and anti-aging properties of the hardboard;

[0020] Environmentally friendly glue, used for bonding and waterproofing of panels, with a coating amount controlled at 100-150g / m 2 To ensure the overall strength and waterproof performance of the hardboard;

[0021] The hard board has a density of 0.6-1.2 g / cm3, a thickness of 2-30 mm, a length of any size, and a width of any size but not exceeding 2400 mm.

[0022] Preferably, in step c, the mechanical treatment comprises the following steps:

[0023] (1) Mixing: The cut jute fiber segments are fed into a mixer and mixed evenly by the mixing equipment to eliminate the gaps between the fibers and improve the compactness and uniformity of the fibers; (2) Combing and opening: The mixed jute fibers are fed into a combing machine and combed and opened by the combing action of the combing equipment to make the fibers looser and arranged in parallel, thereby improving the bonding between the fibers; (3) Needle punching: The combed jute fibers are fed into a needle punching machine and needle punched by the needle punching action of the needle punching equipment to make the fibers intertwined and tightly bonded to form a preliminary hard board structure.

[0024] Preferably, the stirring speed of the mixer is controlled at 10-30 rpm, and the stirring time is 5-15 minutes to ensure that the jute fiber is evenly stirred; the needle density of the needle loom is 200-400 needles / square centimeter, and the needle depth is 1-3 mm to ensure that the jute fiber is tightly combined.

[0025] Preferably, in the step d, the microwave power of the microwave drying equipment is 5-15 kilowatts, and the drying time is 2-10 minutes to ensure a good shaping effect of the jute fiberboard.

[0026] Preferably, in the step f, the pre-pressing pressure of the hot pressing equipment is 5-20 MPa, the pre-pressing temperature is 100-150°C, and the pre-pressing time is 5-20 minutes to ensure the density and strength of the jute fiberboard; in the step h, the hot pressing pressure of the hot pressing equipment is 10-30 MPa, the hot pressing temperature is 150-200°C, and the hot pressing time is 10-30 minutes to ensure that the multiple layers of jute boards are tightly combined to form the final jute fiber hardboard.

[0027] Preferably, in step g, the glue coating equipment adopts the following glue coating techniques, including roller coating, scraper coating and spraying, to ensure that the glue is evenly and quickly covered on the surface and internal pores of the jute fiberboard; the glue coating equipment also includes corresponding exhaust and scraping devices to ensure the flatness and uniformity of the glue coating layer.

[0028] It can be seen from the above technical scheme that in the mechanical treatment stage, the cut jute fibers are first stirred and mixed by a mixer to eliminate the gaps between the fibers and improve the compactness and uniformity of the fibers; then the fibers are combed and opened by a combing machine to make the fibers looser and arranged in parallel, thereby enhancing the bonding force between the fibers; finally, the combed fibers are tightly interwoven together through the needle punching of a needle punching machine to form a preliminary hard board structure. In this process, the stirring speed and stirring time of the mixer as well as the needle punching density and needle punching depth of the needle punching machine are precisely controlled to ensure the tight bonding of the jute fibers and the stability of the hard board structure.

[0029] The microwave shaping step uses the heating effect of the microwave drying equipment to shape the jute fiberboard after needle punching. The microwave power and drying time of the microwave drying equipment are optimized to ensure a good shaping effect of the jute fiberboard and avoid fiber damage caused by excessive heating. In the mesh bag hot pressing positioning step, the shaped jute fiberboard is laid flat on the mesh bag equipment. The positioning effect of the mesh bag equipment is used to locate the thickness and size of the hardboard. This step ensures the dimensional accuracy and appearance quality of the hardboard.

[0030] Preferably, the production method further comprises the following steps:

[0031] Step j. Sanding and thickness determination: the cut jute fiber hardboard is sent to a sanding device for sanding and thickness determination. The sanding device removes burrs and unevenness on the surface of the hardboard, thereby improving the surface quality and glossiness of the hardboard.

[0032] Step k. Packing: sending the sanded and thickness-fixed jute fiber hardboard to a packing device for packing. The packing function of the packing device protects the integrity of the hardboard during transportation and storage.

[0033] Before step j, one or more intermediate sanding steps may be included to perform preliminary surface smoothing on the multi-layer jute board after the hot pressing process and before the corner cutting, so as to remove surface defects that may be generated during the hot pressing process, thereby further improving the surface quality of the final product; the intermediate sanding step uses a wide-width sanding machine equipped with a sanding belt suitable for jute fiber material, and the sanding speed is controlled at 5-20 m / min.

[0034] Before step k, a quality inspection step may also be included, which includes but is not limited to comprehensive testing of the dimensional accuracy, thickness uniformity, surface quality, strength performance and waterproof performance of the hard board; the strength performance test uses a universal material testing machine to test the tensile strength, compressive strength and bending strength items in accordance with relevant national or industry standards; the waterproof performance test uses an immersion method to simulate the moisture contact in the actual use environment and evaluate the waterproof performance indicators of the board's water absorption rate and expansion rate.

[0035] It can be seen from the above technical solution that the main purpose of the intermediate sanding step is to remove surface defects that may be generated during the hot pressing process, such as bubbles, cracks or excess glue residue, so as to further improve the surface quality of the final product.

[0036] Before packaging, the hardboard needs to be quality inspected. The main purpose of this step is to ensure that the dimensional accuracy, thickness uniformity, surface quality, strength and waterproof performance of the hardboard meet the design requirements. The quality inspection steps include but are not limited to measuring the dimensional accuracy of the hardboard, testing the thickness uniformity, visual inspection and touch inspection of the surface quality, testing the strength performance with a universal material testing machine, and immersion testing the waterproof performance. Through these comprehensive testing methods, it can be ensured that each hardboard meets the established quality standards and customer requirements.

[0037] Preferably, before step g, an appropriate amount of functional additives, including flame retardants and anti-aging agents, are added to the jute fiber, and the additives are evenly mixed to ensure effective distribution in the board, thereby enhancing the fire resistance of the hardboard.

[0038] It can be seen from the above technical scheme that high-performance flame retardants and anti-aging agents are selected as functional additives before the jute fiber is pre-pressed and formed. The selection of flame retardants is based on their high flame retardant efficiency, low smoke and non-toxicity, and good compatibility with jute fibers, aiming to effectively improve the fire resistance level of hardboards and reduce fire risks. Anti-aging agents have excellent weather resistance and stability, which can significantly extend the service life of hardboards and maintain their long-term performance stability.

[0039] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0040] 1. In the present invention, in order to solve the problem that jute fiber boards are prone to expansion and deformation in humid environments, environmentally friendly glue is used to glue the single board in the pre-pressing and molding stage, which effectively enhances the waterproof performance of the board; at the same time, by optimizing the hot pressing process, the close bonding between the multi-layer boards is further ensured, reducing the possibility of water penetration, and significantly improving the stability and service life of the board in a humid environment on the basis of its original high strength, wear resistance and corrosion resistance.

[0041] 2. In the present invention, by optimizing the preparation process, the complicated steps in the traditional jute fiber board manufacturing are reduced, such as avoiding the cumbersome process of multi-layer stacking of linen cloth and hemp fiber and impregnation with glue, and directly adopting efficient processes such as cutting, stirring, combing, needling, and microwave shaping, which significantly simplifies the production process and effectively reduces the production cost.

[0042] 3. In the present invention, the uniform distribution and tight combination of jute fibers are ensured through continuous treatment of mechanical stirring, combing and needling, thereby improving the overall structural strength and stability of the hardboard; the combination of microwave shaping and hot pressing technology further consolidates the structure of the board, making it have excellent wear resistance and weather resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a flow chart of the preparation method of the present invention;

[0044] Figure 2 A flow chart of the mechanical treatment of the preparation method of the present invention;

[0045] Figure 3 It is the instrument parameter diagram of the preparation method of the present invention;

[0046] Figure 4 It is a supplementary diagram of the process of the present invention. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] See also Figure 1-Figure 4 In an embodiment of the present invention, a method for making a jute fiber hardboard comprises the following steps:

[0049] Step a. Purchase jute raw materials, select dry, mildew-free, and impurity-free jute fibers as raw materials;

[0050] Step b. cutting process, cutting the purchased jute raw materials into jute fiber segments of predetermined sizes to ensure uniform fiber length;

[0051] Step c. Mechanical treatment, placing in a machine with stirring, combing and acupuncture functions for further processing;

[0052] Step d. Microwave shaping, sending the needle-punched jute fiberboard into a microwave drying device, and shaping the fiber through microwave heating;

[0053] Step e. The mesh bag is hot-pressed to position the jute fiberboard after shaping, and the jute fiberboard is laid flat on the mesh bag device. The thickness positioning and size cutting of the hardboard are performed through the positioning function of the mesh bag device;

[0054] Step f. Pre-pressing, the jute fiberboard after positioning is sent to the hot pressing equipment for pre-pressing to further tightly bond the hardboard;

[0055] Step g. Gluing, the pre-pressed jute fiberboard is sent to the gluing equipment for veneer gluing;

[0056] Step h. hot pressing process, feeding the pre-pressed multi-layer jute board into a hot pressing device for hot pressing process;

[0057] Step i. Edge cutting: the hot-pressed jute fiber hardboard is fed into a push saw device to cut off the edges and corners to ensure the dimensional accuracy and appearance quality of the hardboard;

[0058] A jute fiber hardboard is made by the above-mentioned manufacturing method, and the hardboard is mainly composed of the following material components:

[0059] Jute fiber, as the main structural material, with a content of not less than 70% by weight, preferably bast fiber, to enhance the strength and durability of the board;

[0060] Functional additives, including flame retardants and anti-aging agents, with a total content not exceeding 10% of the total weight, to enhance the fire resistance and anti-aging properties of the hardboard;

[0061] Environmentally friendly glue, used for bonding and waterproofing of panels, with a coating amount controlled at 100-150g / m 2 To ensure the overall strength and waterproof performance of the hardboard;

[0062] The density of the hardboard is 0.6-1.2 g / cm3, the thickness is 2-30 mm, the length is any size, and the width is any size but not more than 2400 mm.

[0063] In step c, the mechanical treatment comprises the following steps:

[0064] (1) stirring and mixing, the cut jute fiber segments are fed into a mixer and stirred evenly by a stirring device to eliminate gaps between the fibers and improve the compactness and uniformity of the fibers;

[0065] (2) Combing and opening the jute fibers. The jute fibers that have been evenly stirred are fed into a combing machine. The combing action of the combing equipment is used to comb and open the fibers, making them looser and arranged in parallel, thereby improving the bonding between the fibers.

[0066] (3) Needle punching: The combed jute fibers are fed into a needle punching machine. The fibers are needle punched into shape by the needle punching action of the needle punching equipment, so that the fibers are interwoven and tightly combined to form a preliminary hard board structure.

[0067] The stirring speed of the mixer is controlled at 10-30 rpm and the stirring time is 5-15 minutes to ensure that the jute fiber is evenly stirred; the needle density of the needle loom is 200-400 needles / square centimeter and the needle depth is 1-3 mm to ensure that the jute fiber is tightly combined.

[0068] In step d, the microwave power of the microwave drying equipment is 5-15 kilowatts, and the drying time is 2-10 minutes to ensure a good shaping effect of the jute fiberboard.

[0069] In step f, the pre-pressing pressure of the hot pressing equipment is 5-20MPa, the pre-pressing temperature is 100-150°C, and the pre-pressing time is 5-20 minutes to ensure the density and strength of the jute fiberboard; in step h, the hot pressing pressure of the hot pressing equipment is 10-30MPa, the hot pressing temperature is 150-200°C, and the hot pressing time is 10-30 minutes to ensure that the multiple layers of jute boards are tightly combined to form the final jute fiber hardboard.

[0070] In step g, the glue coating equipment adopts the following glue coating techniques, including roller coating, scraper coating and spraying, to ensure that the glue is evenly and quickly covered on the surface and internal pores of the jute fiberboard; the glue coating equipment also includes corresponding exhaust and scraping devices to ensure the flatness and uniformity of the glue coating layer.

[0071] The working principle of the embodiment of the present invention is: in the selection of raw materials, dry, mildew-free, and impurity-free jute fibers are strictly selected as the starting materials. Through the cutting process, the jute raw materials are cut into jute fiber segments of predetermined sizes, ensuring the uniformity of the fiber length, which is conducive to the uniform distribution and tight bonding of the fibers in the subsequent steps.

[0072] In the mechanical processing stage, the cut jute fibers are first stirred and mixed by a mixer to eliminate the gaps between the fibers and improve the compactness and uniformity of the fibers; then the fibers are combed and opened by a carding machine to make them looser and arranged in parallel, thus enhancing the bonding force between the fibers; finally, the combed fibers are tightly interwoven by the needle punching machine to form a preliminary hardboard structure. During this process, the stirring speed and stirring time of the mixer as well as the needle punching density and needle punching depth of the needle punching machine are precisely controlled to ensure the tight bonding of the jute fibers and the stability of the hardboard structure.

[0073] The microwave shaping step uses the heating effect of the microwave drying equipment to shape the jute fiberboard after needle punching. The microwave power and drying time of the microwave drying equipment are optimized to ensure good shaping effect of the jute fiberboard while avoiding fiber damage caused by excessive heating.

[0074] In the mesh bag hot pressing positioning step, the shaped jute fiberboard is laid flat on the mesh bag equipment. Through the positioning function of the mesh bag equipment, the thickness positioning and size cutting of the hardboard are carried out. This step ensures the dimensional accuracy and appearance quality of the hardboard.

[0075] In the pre-pressing step, the jute fiberboard after positioning is sent to the hot pressing equipment for pre-pressing, which further improves the density and strength of the hardboard; the pre-pressing pressure, pre-pressing temperature and pre-pressing time of the pre-pressing equipment are precisely set to ensure the pre-pressing effect of the hardboard. In the gluing step, environmentally friendly glue is used to gluing the jute fiberboard after pre-pressing, which enhances the waterproof performance and durability of the hardboard; the type and amount of environmentally friendly glue used by the gluing equipment are optimized to ensure the overall performance of the hardboard.

[0076] In the hot pressing process step, the pre-pressed multi-layer jute board is sent to the hot pressing equipment for hot pressing treatment to form the final jute fiber hard board; the hot pressing pressure, hot pressing temperature and hot pressing time of the hot pressing equipment are precisely controlled to ensure the close bonding of the multi-layer jute board and the overall quality of the hard board.

[0077] See also Figure 1-Figure 4 In an embodiment of the present invention, the manufacturing method further comprises the following steps:

[0078] Step j. Sanding and thickness determination: the cut jute fiber hardboard is sent to a sanding device for sanding and thickness determination. The sanding device removes burrs and unevenness on the surface of the hardboard, thereby improving the surface quality and glossiness of the hardboard.

[0079] Step k. Packing: sending the sanded and thickness-fixed jute fiber hardboard to a packing device for packing. The packing function of the packing device protects the integrity of the hardboard during transportation and storage.

[0080] Before step j, one or more intermediate sanding steps may be included to perform preliminary surface smoothing on the multi-layer jute board after the hot pressing process and before the corner cutting, so as to remove surface defects that may be generated during the hot pressing process, thereby further improving the surface quality of the final product; the intermediate sanding step uses a wide-width sanding machine equipped with a sanding belt suitable for jute fiber material, and the sanding speed is controlled at 5-20 m / min.

[0081] Before step k, a quality inspection step may also be included, which includes but is not limited to a comprehensive inspection of the dimensional accuracy, thickness uniformity, surface quality, strength performance and waterproof performance of the hard board; the strength performance test uses a universal material testing machine to test the tensile strength, compressive strength and bending strength items in accordance with relevant national or industry standards; the waterproof performance test uses an immersion method to simulate the moisture contact in the actual use environment and evaluate the waterproof performance indicators of the board's water absorption rate and expansion rate.

[0082] The working principle of the embodiment of the present invention is as follows: after the corner cutting is completed, the cut jute fiber hardboard is sent to the sanding equipment for sanding and thickness setting. The main purpose of this step is to remove the burrs and unevenness on the surface of the hardboard, thereby improving the surface quality and glossiness of the hardboard. The sanding equipment finely polishes the surface of the hardboard through the rotation of the sanding wheel and the friction of the sanding belt, making the surface smoother and flatter. At the same time, the sanding equipment can also adjust the thickness of the hardboard as needed to ensure that the thickness of the hardboard meets the design requirements. The sanding speed and sanding belt material of this step are optimized to ensure the sanding effect and the surface quality of the hardboard.

[0083] After the hot pressing process and before the corner cutting, one or more intermediate sanding steps can be performed. The main purpose of this step is to remove surface defects that may be generated during the hot pressing process, such as bubbles, cracks or excess glue residue, so as to further improve the surface quality of the final product. The intermediate sanding step uses a wide-width sander equipped with a sanding belt suitable for jute fiber materials, and the sanding speed is controlled between 5-20 meters per minute. Through the fine grinding of the wide-width sander, the surface defects of the hardboard can be effectively removed, and the overall aesthetics and quality of the hardboard can be improved.

[0084] Before packaging, the hardboard needs to be quality inspected. The main purpose of this step is to ensure that the dimensional accuracy, thickness uniformity, surface quality, strength performance and waterproof performance of the hardboard meet the design requirements. The quality inspection steps include but are not limited to measuring the dimensional accuracy of the hardboard, testing the thickness uniformity, visual inspection and touch inspection of the surface quality, universal material testing machine testing of the strength performance, and immersion testing of the waterproof performance. Through these comprehensive testing methods, it can be ensured that each hardboard meets the established quality standards and customer requirements.

[0085] Finally, the jute fiber hardboards that have passed the quality inspection are sent to the baling equipment for baling. The main purpose of this step is to protect the integrity of the hardboards during transportation and storage to prevent them from being damaged or contaminated. The baling equipment wraps and fixes the hardboards firmly in the packaging box through the wrapping and fixing of the packaging materials, ensuring their stability and safety during transportation and storage.

[0086] See also Figure 1-Figure 4 In an embodiment of the present invention, before step g, an appropriate amount of functional additives, including flame retardants and anti-aging agents, are added to the jute fiber, and the additives are evenly mixed to ensure effective distribution in the board, thereby enhancing the fire resistance of the hardboard.

[0087] The working principle of the embodiment of the present invention is: before the jute fiber is pre-pressed and formed, high-performance flame retardants and anti-aging agents are selected as functional additives. The flame retardant is selected based on its high flame retardant efficiency, low smoke and non-toxicity, good compatibility with jute fiber, etc., aiming to effectively improve the fireproof level of the hardboard and reduce the risk of fire. The anti-aging agent has excellent weather resistance and stability, which can significantly extend the service life of the hardboard and maintain its long-term performance stability.

[0088] Working principle: Selected dry, mildew-free jute fibers are used as raw materials, and they are precisely cut and mechanically processed to form a hardboard with a tight initial structure. Subsequently, microwave shaping is used to consolidate the structure, and then hot-pressing positioning is performed with a mesh bag to ensure dimensional accuracy. After pre-pressing, environmentally friendly glue is added to enhance waterproofness and durability, and a multi-layer, tightly bonded hardboard is formed through a hot-pressing process. After that, the surface quality is improved through sanding, and finally quality inspection and packaging are carried out. In particular, high-performance flame retardants and anti-aging agents are added before pre-pressing to significantly improve the fire resistance and service life of the hardboard. The entire process focuses on precise control and optimal selection to ensure the high quality of the product.

[0089] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit thereof, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for making a jute fiber hardboard, characterized in that: The following steps are involved: Step a. Purchase jute raw materials, select dry, mildew-free, and impurity-free jute fibers as raw materials; Step b. cutting process, cutting the purchased jute raw materials into jute fiber segments of predetermined sizes to ensure uniform fiber length; Step c. Mechanical treatment, placing in a machine with stirring, combing and acupuncture functions for further processing; Step d. Microwave shaping, sending the needle-punched jute fiberboard into a microwave drying device, and shaping the fiber through microwave heating; Step e. The mesh bag is hot-pressed to position the jute fiberboard after shaping, and the jute fiberboard is laid flat on the mesh bag device. The thickness positioning and size cutting of the hardboard are performed through the positioning function of the mesh bag device; Step f. Pre-pressing, the jute fiberboard after positioning is sent to the hot pressing equipment for pre-pressing to further tightly bond the hardboard; Step g. Gluing, the jute fiberboard after pre-pressing is sent to the gluing equipment for veneer gluing; Step h. hot pressing process, feeding the pre-pressed multi-layer jute board into a hot pressing device for hot pressing process; Step i. Edge cutting: the hot-pressed jute fiber hardboard is fed into a push saw device to cut off the edges and corners to ensure the dimensional accuracy and appearance quality of the hardboard; A jute fiber hardboard is made by the above-mentioned manufacturing method, and the hardboard is mainly composed of the following material components: Jute fiber, as the main structural material, with a content of not less than 75% of the total weight, preferably bast fiber, to enhance the strength and durability of the board; Functional additives, including flame retardants and anti-aging agents, with a total content not exceeding 10% of the total weight, to enhance the fire resistance and anti-aging properties of the hardboard; Environmentally friendly glue, used for bonding and waterproofing of panels, with a coating amount controlled at 100-150g / m 2 To ensure the overall strength and waterproof performance of the hardboard; The hard board has a density of 0.6-1.2 g / cm3, a thickness of 2-30 mm, a length of any size, and a width of any size but not exceeding 2400 mm.

2. The method for making a jute fiber hardboard according to claim 1, characterized in that: In the step c, the mechanical treatment comprises the following steps: (1) stirring and mixing, the cut jute fiber segments are fed into a mixer and stirred evenly by a stirring device to eliminate gaps between the fibers and improve the compactness and uniformity of the fibers; (2) Combing and opening the jute fibers. The jute fibers that have been evenly stirred are fed into a combing machine. The combing action of the combing equipment is used to comb and open the fibers, making them looser and arranged in parallel, thereby improving the bonding between the fibers. (3) Needle punching: The combed jute fibers are fed into a needle punching machine. The fibers are needle punched into shape by the needle punching action of the needle punching equipment, so that the fibers are interwoven and tightly combined to form a preliminary hard board structure.

3. The method for making a jute fiber hardboard according to claim 2, characterized in that: The stirring speed of the mixer is controlled at 10-30 rpm, and the stirring time is 5-15 minutes to ensure that the jute fibers are stirred evenly; the needle density of the needle loom is 200-400 needles / square centimeter, and the needle depth is 1-3 mm to ensure that the jute fibers are tightly combined.

4. The method for making a jute fiber hardboard according to claim 1, characterized in that: In the step d, the microwave power of the microwave drying equipment is 5-15 kilowatts, and the drying time is 2-10 minutes, so as to ensure a good shaping effect of the jute fiberboard.

5. The method for making a jute fiber hardboard according to claim 1, characterized in that: In the step f, the pre-pressing pressure of the hot pressing equipment is 5-20MPa, the pre-pressing temperature is 100-150°C, and the pre-pressing time is 5-20 minutes to ensure the density and strength of the jute fiberboard; in the step h, the hot pressing pressure of the hot pressing equipment is 10-30MPa, the hot pressing temperature is 150-200°C, and the hot pressing time is 10-30 minutes to ensure that the multiple layers of jute boards are tightly combined to form the final jute fiber hardboard.

6. The method for making a jute fiber hardboard according to claim 1, characterized in that: In step g, the glue coating equipment adopts the following glue coating techniques, including roller coating, scraper coating and spray coating, to ensure that the glue is evenly and quickly covered on the surface and internal pores of the jute fiberboard; the glue coating equipment also includes corresponding exhaust and scraper devices to ensure the flatness and uniformity of the glue coating layer.

7. The method for making a jute fiber hardboard according to claim 1, characterized in that: The production method further comprises the following steps: Step j. Sanding and thickness determination: the cut jute fiber hardboard is sent to a sanding device for sanding and thickness determination. The sanding device removes burrs and unevenness on the surface of the hardboard, thereby improving the surface quality and glossiness of the hardboard. Step k. Packing: sending the sanded and thickness-fixed jute fiber hardboard to a packing device for packing. The packing function of the packing device protects the integrity of the hardboard during transportation and storage.

8. The method for making a jute fiber hardboard according to claim 7, characterized in that: Before step j, one or more intermediate sanding steps may be included to perform preliminary surface smoothing on the multi-layer jute board after the hot pressing process and before the corner cutting, so as to remove surface defects that may be generated during the hot pressing process, thereby further improving the surface quality of the final product; the intermediate sanding step uses a wide-width sanding machine equipped with a sanding belt suitable for jute fiber material, and the sanding speed is controlled at 5-20 m / min.

9. The method for making a jute fiber hardboard according to claim 7, characterized in that: Before step k, a quality inspection step may also be included, which includes but is not limited to comprehensive testing of the dimensional accuracy, thickness uniformity, surface quality, strength performance and waterproof performance of the hardboard; the strength performance test uses a universal material testing machine to test the tensile strength, compressive strength and bending strength items in accordance with relevant national or industry standards; the waterproof performance test uses an immersion method to simulate the moisture contact in the actual use environment and evaluate the waterproof performance indicators of the board's water absorption rate and expansion rate.

10. The method for making a jute fiber hardboard according to claim 1, characterized in that: Before step g, a proper amount of functional additives, including flame retardants and anti-aging agents, are added to the jute fibers, and the additives are evenly mixed to ensure effective distribution in the board, thereby enhancing the fire resistance of the hardboard.

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