Anti-cracking and anti-mildew composite type bamboo chopping board and manufacturing method thereof

Abstract

The application discloses a kind of anti-cracking mould-proof composite bamboo chopping board and manufacturing method thereof, belong to bamboo chopping board manufacturing technical field, bamboo chopping board includes by white bamboo block and black bamboo block alternative adhesion arrangement and becomes anvil plate body, and bamboo fibre prepared by bamboo processing waste is mixed in bamboo cement;Bamboo fibre is made by corner waste and bamboo green / bamboo yellow shaving waste after processing in bamboo block cutting, carbonization, cooking procedure;Anvil plate body has deep layer nourishing protective layer and surface dense protective layer.Manufacturing method includes raw material pretreatment, composite forming, mould-proof anti-cracking strengthening treatment and later processing procedure;In raw material pretreatment procedure, bamboo fibre preparation is: bamboo green antibacterial solution is prepared by bamboo green / bamboo yellow shaving waste hot water extraction;Corner waste is soaked after crushing, drying with the mixed solution of silane coupling agent solution and bamboo green antibacterial solution, realizes antibacterial modification;After airing, soak with ε-polylysine solution, realizes antibacterial strengthening.The application realizes waste recycling and efficient and durable mould-proof anti-cracking performance.

Description

Technical Field

[0001] This invention mainly relates to the field of bamboo cutting board manufacturing technology, specifically a crack-resistant and mildew-resistant composite bamboo cutting board and its manufacturing method. Background Technology

[0002] Bamboo cutting boards, an indispensable tool in food processing, have become the preferred kitchenware for homes and restaurants due to bamboo's natural environmental friendliness, moderate hardness, wear resistance, impact resistance, and cost-effectiveness. Bamboo has a short growth cycle and high renewability; its internal fibers are dense and regularly arranged. Cutting boards made from bamboo avoid the potential release of harmful chemicals from plastic cutting boards and overcome the drawbacks of some solid wood cutting boards, such as easy shedding of fibers and bacterial growth. This aligns with modern consumers' demand for healthy and environmentally friendly kitchenware, resulting in a broad market application prospect.

[0003] Currently, the industry has developed various processing technologies to address the needs for mildew, crack, and insect prevention in bamboo cutting boards. These technologies mainly include raw material pretreatment, surface protection, and structural composites. In terms of raw material treatment, common methods include high-temperature carbonization, steaming and drying, and ultrasonic treatment. These methods remove nutrients such as starch and sugar from the bamboo, reducing the basis for mold growth. For protective treatment, methods such as vacuum soaking, applying edible vegetable oil or paraffin coatings under normal pressure, or adding chemical preservatives are often used to create antibacterial and water-resistant barriers. In terms of structural design, multi-layer bamboo board composites and bamboo strip splicing processes have emerged, and some products also incorporate steel hoops to enhance structural stability.

[0004] However, existing technologies still have many problems that urgently need to be solved:

[0005] (1) Limited and short-lived anti-mildew and anti-cracking effects: Traditional high-temperature carbonization, steaming and drying can only inhibit mold in the short term. In humid environments or after long-term use, the trace nutrients remaining inside the bamboo will still cause mold growth. The protective methods of surface waxing and single plant oil soaking can only act on the surface and cannot achieve deep protection. Moreover, the protective layer is easy to wear and fall off, which leads to drastic volume changes after the bamboo cutting board is repeatedly absorbed and dried, resulting in cracking. The anti-mildew and anti-cracking effect cannot meet the actual use needs.

[0006] (2) Significant safety hazards: Some technologies rely on chemical preservatives (such as compounds containing copper, chromium, boron, arsenic, etc.) or synthetic antioxidants. These substances may migrate during food contact and endanger human health. Some multi-layer composite processes use urea-formaldehyde resin and other formaldehyde-containing adhesives, which pose a risk of formaldehyde release and do not meet the safety standards for food contact materials. In addition, the small molecule antibacterial components used in other technologies are easily lost, which not only reduces the protective effect but may also bring potential safety problems.

[0007] (3) Insufficient environmental protection: bamboo scraps, planing waste, soaking waste liquid and other materials generated during the production process are mostly directly discarded, resulting in low resource utilization; some treatment agents are difficult to degrade, causing additional burden on the environment, which does not conform to the concept of green production.

[0008] (4) Poor performance stability: In the existing protective technology, the antibacterial components are not firmly bonded to the bamboo and are easily lost during long-term cutting and washing, resulting in a rapid decline in anti-mildew and anti-insect performance; some bamboo cutting boards have poor dimensional stability and high shrinkage rate, which affects the user experience.

[0009] Therefore, developing a bamboo cutting board that combines high-efficiency, long-lasting anti-mildew and anti-cracking properties, food-grade safety, environmental protection, and energy saving, as well as its manufacturing method, has become a technical challenge that the industry urgently needs to solve. Summary of the Invention

[0010] The present invention addresses the problem of overly simplistic solutions in existing technologies by providing a significantly different solution. It primarily offers a composite bamboo cutting board that is crack-resistant and mildew-resistant, along with its manufacturing method, to achieve waste recycling and highly efficient and durable anti-mildew and crack-resistant performance.

[0011] In terms of environmental protection, this application aims to build a complete system that integrates bamboo scraps into the bamboo cutting board manufacturing process, the recycling of soaking waste liquid, and the recycling of waste products. However, existing technologies only recycle one aspect and do not achieve the full-chain resource utilization of waste.

[0012] In terms of protection, existing technologies either involve soaking in a single plant oil / chemical agent or applying a surface coating, without addressing the dual-layer protection that combines deep nourishment with surface barrier.

[0013] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0014] In a first aspect, the present invention proposes a composite bamboo cutting board that is crack-resistant and mildew-resistant, comprising a cutting board body, which is composed of alternating white bamboo blocks and black bamboo blocks, and bamboo fiber prepared from bamboo processing waste is mixed into the bamboo glue used for bonding the cutting board; the bamboo fiber is made from the scraps generated during the bamboo block cutting, carbonization, and steaming processes, as well as the bamboo green / bamboo yellow planing waste; the cutting board body has a deep nourishing protective layer and a dense surface protective layer.

[0015] Furthermore, both white and black bamboo blocks are placed vertically, with their large end faces serving as the bonding surfaces and their small side faces located on the cutting board body's end face used for cutting vegetables, which can improve wear resistance and structural integrity.

[0016] Furthermore, white bamboo blocks and black bamboo blocks are alternately pasted and glued in one direction to form a unit block, and multiple unit blocks are arranged and glued to form the cutting board body; the bamboo blocks (including white bamboo blocks and black bamboo blocks) of each adjacent unit block are arranged in the same or different directions.

[0017] Furthermore, a steel ring is provided around the perimeter of the cutting board body;

[0018] And / or, a handle is provided on one side of the cutting board body.

[0019] Furthermore, the two ends of the steel ring are connected by elastic fasteners, which include a connecting rod, a first rigid spring, and a second rigid spring. The connecting rod passes through both ends of the steel ring, and the first rigid spring and the second rigid spring are respectively sleeved on both ends of the connecting rod. One end of the connecting rod is provided with a limiting and fixing plate, and the other end is provided with an adjusting nut and a locking nut. The connecting rod is provided with threads that are adapted to the adjusting nut and the locking nut.

[0020] Secondly, the present invention also provides a method for manufacturing the above-mentioned anti-cracking and anti-mildew composite bamboo cutting board, including raw material pretreatment, composite molding, anti-mildew and anti-cracking strengthening treatment and post-processing.

[0021] The bamboo fiber preparation process in the raw material pretreatment stage includes the following steps:

[0022] (1) Waste collection: collect scraps and waste materials from bamboo cutting, carbonization and steaming processes;

[0023] (2) Preparation of bamboo green antibacterial liquid: It is prepared by soaking bamboo green / bamboo yellow planing waste in hot water at 75-85℃ for 2-3 hours. The final solid-liquid ratio of bamboo green antibacterial liquid is 1:10.

[0024] (3) Bamboo fiber processing: After the scraps are crushed, they are dried at 100-110℃ until the moisture content is ≤5%. Then they are soaked in a mixture of silane coupling agent solution and bamboo antibacterial solution for 4-8 minutes. The content of silane coupling agent in the mixture is 0.5% and the content of bamboo antibacterial solution is 0.3%.

[0025] (4) Antibacterial enhancement: After the scraps are taken out and dried, they are soaked in 0.2% ε-polylysine solution for 2-4 minutes and then dried for later use.

[0026] In the composite molding process, when preparing bamboo glue, the prepared bamboo fiber, modified soybean protein glue, and deionized water are mixed at a mass ratio of 8:100:15-20 and then evenly dispersed by a high-speed disperser without clumping or sedimentation to obtain bamboo glue; the bamboo glue is used to coat the bonding surfaces of white bamboo blocks and black bamboo blocks.

[0027] When preparing bamboo fiber from bamboo scraps, the antibacterial effect is ensured by mixing and soaking the bamboo scraps with silane coupling agent (0.5%) and bamboo antibacterial liquid (0.3%), and strengthening with ε-polylysine (0.2%). This ensures that the mixing with bamboo glue does not affect the bonding strength (no bubbles / voids after hot pressing).

[0028] Furthermore, the preparation of black bamboo blocks in the raw material pretreatment process includes the following steps:

[0029] (1) Bamboo tube processing: Cut the bamboo into bamboo tubes, remove the outer and inner nodes, peel off the skin and cut into bamboo blocks with a width of 6.5-10cm and a thickness of 5-10mm;

[0030] (2) Pretreatment before carbonization: Soak bamboo blocks in hot water at 75-85℃ for 0.8-1.5 hours to remove surface sugar and dust, and drain the surface moisture; after cutting, control the thickness deviation of bamboo blocks to ≤0.2mm;

[0031] (3) Step carbonization: Place the bamboo blocks into the carbonization furnace, introduce 99% pure nitrogen as a protective gas, raise the temperature to 95-105℃ at 5℃ / min, keep it at 1-1.5 hours to remove free water; then raise the temperature to 150-160℃ and keep it at 4 hours to decompose nutrients such as starch; at the end of the carbonization, maintain the nitrogen atmosphere and let it cool naturally to below 80℃ before taking it out.

[0032] (4) Low-temperature slow drying: Dry at 55-65℃ for 2.5-3.5 hours, then raise the temperature to 75-85℃ and dry for 1.5-2.5 hours, controlling the moisture content to 8%-10%;

[0033] (5) Surface treatment: Lightly sand with 240-grit sandpaper to remove the loose carbonized layer on the surface and expose the dense bamboo fiber.

[0034] The preparation of white bamboo blocks in the raw material pretreatment process includes the following steps:

[0035] (1) Bamboo tube processing: cut into bamboo blocks of the same size as the black bamboo blocks;

[0036] Enhanced steaming: Add boiling water to the steamer, add tea seed water, 0.3% mugwort essential oil and 0.5% salt in a ratio of 5%, put in bamboo pieces and steam for 2-3 hours to remove easily moldy substances and penetrate natural antibacterial components;

[0037] (2) Drying and shaping: First, air dry naturally, then put it into a drying equipment at 45-55℃ to dry, controlling the moisture content to 9%-11%;

[0038] (3) Surface treatment: Quickly rinse the residual impurities with clean water, dry with hot air, roughen the bonding surface with 180-grit sandpaper, and then lightly brush a layer of diluted modified soybean protein glue as a base coat.

[0039] After the black bamboo blocks and white bamboo blocks are assembled, they are hot-pressed together. The hot-pressing temperature is 130-140℃, the pressure is 12-15MPa, and the hot-pressing time is 45-60 minutes.

[0040] Most existing technologies only process single types of bamboo and lack precise parameter coordination design, making it difficult to conceive of improving the overall performance of composite cutting boards through differentiated treatment of two bamboo blocks. Therefore, there is no existing logical inspiration for the precise matching of differentiated designs for the two types of bamboo blocks. This application adopts differentiated pretreatment for black bamboo blocks (stepped carbonization) and white bamboo blocks (enhanced steaming), strictly controlling the moisture content (8-10% for black and 9-11% for white) and thickness deviation (≤0.2mm) to adapt to the subsequent hot pressing parameters (130-140℃, 12-15MPa).

[0041] The stepped carbonization of black bamboo blocks requires precise control of the heating rate and multi-stage holding time under nitrogen protection, with the final moisture content needing to be stabilized at 8-10%. Parameter deviations can lead to loose bamboo fibers or over-carbonization. The enhanced steaming of white bamboo blocks requires precise proportions of tea seed oil (5%), mugwort essential oil (0.3%), and salt (0.5%). This process must remove easily moldy substances while ensuring the penetration depth of natural antibacterial components, while controlling the moisture content to 9-11% to avoid internal stress caused by significant moisture content differences between the two bamboo blocks during subsequent assembly. The thickness deviation after cutting must be ≤0.2mm; otherwise, gaps will appear during adhesive application, affecting the hot-pressing bonding strength. Current technology lacks a design case demonstrating such precise parameter coordination between the two bamboo blocks.

[0042] Furthermore, in the process of mildew and crack prevention strengthening treatment, the preparation of the compound treatment agent includes the following steps:

[0043] (1) Base liquid: Mix woody camellia oil and edible wax evenly at a mass ratio of 7:3, and heat to 100℃ to melt;

[0044] (2) Compound modification: Based on the base solution, add 0.5% to 1% tea seed extract, 0.3% to 0.5% artemisia oil, 2% to 3% rosin modified resin, and 1% to 2% nano silica. After stirring evenly, the compound treatment agent is obtained and kept warm at 80°C for later use.

[0045] The anti-mildew and anti-cracking strengthening treatment process includes the following steps in the staged vacuum pressure impregnation:

[0046] (1) First stage: Place the composite molded slab into a vacuum pressure tank, evacuate the vacuum pressure tank to -0.08MPa, maintain for 25 to 35 minutes, inject pure camellia oil heated to 100℃, soak for 2 to 3 hours to allow the oil to penetrate deeply and form a deep nourishing and protective layer;

[0047] (2) Second stage: Remove and drain the surface oil, re-vacuum to -0.08MPa, inject compound treatment agent, pressurize to 0.3-0.5MPa, soak for 3-4 hours, so that the protective liquid penetrates to a depth of 5-8mm and forms a dense protective layer on the surface;

[0048] (3) Waste liquid recycling: After soaking, filter the remaining treatment agent in the tank with a 100-mesh filter, and add 0.2% tea seed cake extract and 0.1% rosin modified resin to avoid the decline of the effective components in the waste liquid, which would lead to a decrease in the anti-mildew and anti-cracking performance. The soaking waste liquid after the first soaking can be recycled 3 to 5 times.

[0049] After soaking, a second curing process is carried out: the soaked board blank is first dried at a low temperature of 60℃ for 1.5 to 2.5 hours, and then placed in a constant temperature and humidity chamber of 40℃ and 50% humidity for 3.5 to 4.5 hours to allow the protective layer to fully combine with the bamboo fiber, thus obtaining the cutting board.

[0050] Existing technologies mostly involve single-medium immersion, lacking a phased process parameter optimization logic. Two core issues need to be addressed: media compatibility and controllable penetration depth. This application addresses these two issues by strictly controlling vacuum level and immersion time in the first stage to ensure camellia oil penetrates deep into the bamboo while minimizing residual oil that could affect the adsorption of the treatment agent in the second stage. In the second stage, pressure is increased to 0.3–0.5 MPa, and the penetration depth of the compound treatment agent is strictly controlled to 5–8 mm, forming a surface barrier film without affecting the nourishing effect of the deep-layer camellia oil. Ultimately, this achieves dual protection: deep penetration of pure camellia oil followed by a dense surface barrier from the compound treatment agent.

[0051] Furthermore, the waste soaking liquid after recycling is used as a binder for biomass pellets; after the composite bamboo cutting board is scrapped, the recycling methods include: after removing the metal parts, the bamboo is crushed into bamboo powder with a particle size of <1mm, and mixed with the waste soaking liquid at a mass ratio of 100:5, then extruded and granulated to produce biomass pellets.

[0052] After the discarded bamboo cutting board is crushed, it is mixed with waste soaking solution at a ratio of 100:5 and granulated to ensure the cohesiveness of the biomass pellets. Current technology lacks a balanced end-to-end recycling and reuse solution that maintains performance; therefore, the conflict between the performance of recycled materials and the finished product needs to be addressed.

[0053] Furthermore, after composite molding or after anti-mildew and anti-cracking reinforcement treatment, the steel hoop and elastic fastener assembly process is carried out.

[0054] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0055] (1) This invention prepares bamboo processing waste into bamboo fiber and mixes it with bamboo glue. The scraps are crushed, dried, and antibacterial modified to give the bamboo fiber antibacterial properties and adhesive compatibility. Modified soybean protein glue and deionized water are mixed in a ratio of 8:100:15-20 and uniform dispersion is achieved through high-speed dispersion, which enhances the adhesive strength and long-lasting antibacterial effect of the bamboo glue. Compared with the existing technology, which has low utilization rate of bamboo processing waste, pollutes the environment, has insufficient adhesive strength of bamboo glue, is easy to fall off, lacks natural antibacterial components, and is prone to bacterial growth after long-term use, this invention improves the utilization rate of waste resources, makes the bamboo glue firmly bonded, and has natural antibacterial properties to prevent bacteria from growing on the bonding surface; reduces raw material costs and conforms to the concept of green production.

[0056] (2) After use, the soaking solution of the present invention is filtered through a 100-mesh filter, and then 0.2% tea seed cake extract and 0.1% rosin-modified resin are added to maintain the concentration of effective ingredients, allowing it to be recycled 3 to 5 times. Furthermore, the final waste soaking solution is used as a biomass pellet binder, and the crushed bamboo cutting board is mixed with the waste liquid for granulation. This solves the problem that in the prior art, waste liquid and scrapped products are often directly discarded, resulting in serious resource waste and environmental pollution. The waste utilization rate of the entire process of the present invention is >80%, reducing the environmental burden and raw material costs; and the recycling of waste liquid does not affect the protective effect, and scrapped products realize the resource reuse of bamboo and metal, which is in line with the concept of green environmental protection.

[0057] (3) In the first stage of this invention, pure camellia oil is vacuum-injected for deep penetration, forming a water-resistant nourishing layer; in the second stage, a natural compound treatment agent (camellia oil + edible wax + tea seed extract, etc.) is injected under pressure to form a dense barrier film on the surface; the vacuum pressure environment ensures that the protective liquid penetrates to a depth of 5-8 mm, achieving both deep nourishment and surface protection. This solves the problems of insufficient protection depth of existing technologies with single-medium immersion / surface coating, easy wear of the protective layer, short anti-mildew and anti-cracking time, and partial reliance on chemical treatment agents, which pose safety hazards. The anti-mildew and anti-cracking time of this invention is more than twice that of conventional products, the protective layer is firmly bonded to bamboo fiber and is not easy to fall off; and food-grade natural raw materials are used throughout the process, with camellia oil and treatment agent residues ≤0.05mg / dm², which meets safety standards.

[0058] (4) This invention utilizes the differentiated characteristics of two types of bamboo blocks: black bamboo exhibits strong stability after carbonization, while white bamboo contains natural antibacterial components. By alternating and arranging white and black bamboo blocks, the internal stress generated by the thermal expansion and contraction of the bamboo is dispersed, avoiding localized stress concentration. This solves the problems of uneven performance caused by single bamboo processing in existing technologies, the inability of the fixed arrangement structure to adapt to the expansion and contraction characteristics of bamboo, and the tendency to crack due to internal stress concentration. The cutting board structure provided by this invention has significantly improved structural stability, with a total dry shrinkage rate of ≤1.5%, and no cracks after 1000 simulated chopping cycles, balancing stability and user experience.

[0059] (5) In the preparation process of the black bamboo blocks of the present invention, nitrogen protection is used for step-by-step carbonization to gradually remove free water and starch, reducing the basis for mold growth; in the preparation process of the white bamboo blocks, tea seed water, mugwort essential oil and salt are used for enhanced steaming to remove easily moldy substances and infiltrate natural antibacterial components; the moisture content of both (8%~10% for black, 9%~11% for white) and thickness deviation (≤0.2mm) are precisely controlled to match the subsequent hot pressing parameters. This solves the problem of short anti-mold and anti-cracking time of the single pretreatment in the existing technology, large deviation of bamboo block moisture content / size, resulting in uneven hot pressing adhesion after assembly, and easy internal stress cracking. The stability of black bamboo and the antibacterial properties of white bamboo in the present invention are synergistic, with a control efficacy of ≥90% against Aspergillus niger and Trichoderma viride; the bamboo block size and moisture content are highly consistent, and the cutting board body is gapless after hot pressing, with a dense structure, extending the service life.

[0060] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0061] Figure 1 A flowchart illustrating the method for manufacturing the bamboo cutting board provided by this invention;

[0062] Figure 2 This is a front view of the structure of the bamboo cutting board provided by the present invention;

[0063] Figure 3 This is an enlarged schematic diagram of the structure of the elastic fastener in this invention;

[0064] Figure 4 This is a bar chart showing the total dry shrinkage rate of embodiments and comparative examples of the present invention;

[0065] Figure 5 This is a bar chart showing the adhesive strength of the embodiments and comparative examples of the present invention;

[0066] Figure 6 This is a bar chart showing the safe residual migration amounts in embodiments and comparative examples of the present invention;

[0067] Figure 7 This is a bar chart showing the waste utilization rate of the embodiments and comparative examples of the present invention.

[0068] Reference numerals: 1. Cutting board body; 11. White bamboo block; 12. Black bamboo block; 2. Steel ring; 3. Elastic fastener; 31. Connecting rod; 311. Limiting and fixing plate; 312. Adjusting nut; 313. Locking nut; 32. First rigid spring; 33. Second rigid spring; 4. Handle. Detailed Implementation

[0069] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the present invention. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. Rather, these embodiments are provided to make the disclosure of the present invention more thorough and complete.

[0070] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly associated with those skilled in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0071] Example: Please refer to the appendix for details. Figure 2 and attached Figure 3 A composite bamboo cutting board that is crack-resistant and mildew-resistant includes a cutting board body 1, which is mainly composed of white bamboo blocks 11 and black bamboo blocks 12 that are alternately pasted and arranged.

[0072] In some embodiments, both the white bamboo block 11 and the black bamboo block 12 are placed vertically, with the larger end face serving as the bonding surface and the smaller side face located on the main end face (the surface used for cutting vegetables) of the cutting board body 1.

[0073] In some embodiments, white bamboo blocks 11 and black bamboo blocks 12 are alternately pasted and glued in one direction to form a unit block, and multiple unit blocks are arranged and glued to form the cutting board body 1.

[0074] In some embodiments, the bamboo blocks of every two adjacent unit blocks are arranged in the same direction.

[0075] In some embodiments, the bamboo blocks of each two adjacent unit blocks are arranged in different directions. For example, the bamboo blocks of one unit block are arranged horizontally, while the bamboo blocks of the adjacent unit blocks are arranged vertically.

[0076] Please refer to the attached document carefully. Figure 1 The manufacturing method of the above-mentioned crack-resistant and mildew-resistant composite bamboo cutting board includes the following steps:

[0077] I. Preparation of Raw Materials and Equipment

[0078] 1. Core raw materials

[0079] (1) Bamboo material: 3-5 year old high-quality moso bamboo (bamboo wall thickness ≥8.5mm), cut from the middle and root bamboo tubes;

[0080] (2) Environmentally friendly auxiliary materials: modified soybean protein gum (food contact grade), silane coupling agent (KH-550), ε-polylysine (food grade), tea seed cake extract (containing tea saponin ≥90%), mugwort essential oil (natural purity ≥95%), rosin modified resin (food grade), nano silica (food grade, particle size 20-50nm), woody camellia oil, edible wax, salt (food grade);

[0081] 2. Key Equipment

[0082] Carbonization furnace, cooking pot, drying equipment (temperature control accuracy ±5℃), high-speed disperser (speed ≥1500r / min), hot press (pressure range 0~20MPa, temperature control accuracy ±5℃), vacuum pressurization tank (vacuum degree -0.1MPa~0.6MPa), ultrasonic cleaner, grinding and polishing machine, constant temperature and humidity chamber.

[0083] II. Raw material pretreatment (including waste recycling pretreatment)

[0084] 1. Preparation of black bamboo blocks

[0085] (1) Bamboo tube processing: Cut the bamboo into 30-50cm bamboo tubes, remove the outer and inner nodes, peel off the skin and cut into bamboo blocks with a width of 6.5-10cm and a thickness of 5-10mm;

[0086] (2) Pretreatment before carbonization: Soak bamboo blocks in hot water at 75-85℃ for 0.8-1.5 hours to remove surface sugar and dust, and drain the surface moisture; after cutting, control the thickness deviation of bamboo blocks to ≤0.2mm;

[0087] (3) Step carbonization: Place the bamboo blocks into the carbonization furnace, introduce 99% pure nitrogen as a protective gas, raise the temperature to 95-105℃ at 5℃ / min, keep it at 1-1.5 hours to remove free water; then raise the temperature to 150-160℃ and keep it at 4 hours to decompose nutrients such as starch; at the end of the carbonization, maintain the nitrogen atmosphere and let it cool naturally to below 80℃ before taking it out.

[0088] (4) Low-temperature slow drying: Dry at 55-65℃ for 2.5-3.5 hours, then raise the temperature to 75-85℃ and dry for 1.5-2.5 hours, controlling the moisture content to 8%-10%;

[0089] (5) Surface treatment: Lightly sand with 240-grit sandpaper to remove the loose carbonized layer on the surface and expose the dense bamboo fiber.

[0090] 2. Preparation of white bamboo blocks

[0091] (1) Bamboo tube processing: cut into bamboo blocks of the same size as the black bamboo blocks;

[0092] (2) Enhanced steaming: Add boiling water to the steaming pot, add tea seed cake water (made from tea seed cake) at a ratio of 5%, 0.3% mugwort essential oil and 0.5% salt, put in bamboo blocks and steam for 2-3 hours to remove easily moldy substances and penetrate natural antibacterial components;

[0093] (3) Drying and shaping: First, air dry naturally, then put it into a drying equipment at 45-55℃ to dry, controlling the moisture content to 9%-11%;

[0094] (4) Surface treatment: Quickly rinse the residual impurities with clean water, dry with hot air, roughen the bonding surface with 180-grit sandpaper, and then lightly brush a layer of diluted modified soybean protein glue (original glue: water = 1:3) as a base coat.

[0095] 3. Bamboo fiber preparation (waste recycling)

[0096] (1) Waste collection: collect scraps (length < 5cm) and bamboo green / bamboo yellow planing waste generated during the bamboo cutting, carbonization and steaming process;

[0097] (2) Preparation of bamboo green antibacterial liquid: It is prepared by soaking bamboo green / bamboo yellow planing waste in hot water at 75-85℃ for 2-3 hours. The final solid-liquid ratio of bamboo green antibacterial liquid is 1:10.

[0098] (3) Bamboo fiber processing: After the scraps are crushed, they are dried at 100-110℃ until the moisture content is ≤5%. Then they are soaked in a mixture of silane coupling agent solution and bamboo antibacterial solution for 4-8 minutes. The content of silane coupling agent in the mixture is 0.5% and the content of bamboo antibacterial solution is 0.3%.

[0099] (4) Antibacterial enhancement: After the scraps are taken out and dried, they are soaked in 0.2% ε-polylysine solution for 2-4 minutes and then dried for later use.

[0100] III. Composite Molding

[0101] 1. Bamboo glue preparation

[0102] The bamboo fiber, modified soybean protein gum, and deionized water prepared above are mixed at a mass ratio of 8:100:15-20, and stirred for 12-20 minutes using a high-speed disperser at 1500r / min to ensure that the bamboo fiber is evenly dispersed without clumping or sedimentation.

[0103] 2. Billet assembly

[0104] The prepared black bamboo blocks and white bamboo blocks are arranged alternately to ensure uniform arrangement without gaps, forming a slab. The slab specifications are controlled according to the finished product requirements.

[0105] During the assembly process, adhesive is applied, with an amount of 150-200 g / m² applied to the bonding surface.

[0106] 3. Hot pressing bonding

[0107] (1) Place the slab in a hot press for hot pressing. The parameters include: hot press temperature 130-140℃, pressure 12-15MPa, and hot pressing time 45-60 minutes.

[0108] (2) Heat preservation and curing: After hot pressing, the board is placed in a constant temperature environment of 60℃ for 2 hours to allow the bamboo glue to cure slowly and avoid the formation of bubbles or voids.

[0109] 4. Facial contouring

[0110] The slab can be cut and processed according to the target contour to produce rectangles, circles, polygons or irregular shapes.

[0111] IV. Anti-mildew and anti-crack reinforcement treatment

[0112] 1. Preparation of compound treatment agent

[0113] (1) Base liquid: Mix woody camellia oil and edible wax evenly at a mass ratio of 7:3, and heat to 100℃ to melt;

[0114] (2) Compound modification: Based on the base solution, add 0.5% to 1% tea seed extract, 0.3% to 0.5% artemisia oil, 2% to 3% rosin modified resin, and 1% to 2% nano silica. After stirring evenly, the compound treatment agent is obtained and kept warm at 80°C for later use.

[0115] 2. Staged vacuum pressure immersion

[0116] (1) First stage: Place the slab after contouring into a vacuum pressure tank, vacuum the tank to -0.08MPa, maintain for 25 to 35 minutes, inject pure camellia oil heated to 100℃, soak for 2 to 3 hours to allow the oil to penetrate deeply and form a deep nourishing and protective layer;

[0117] (2) Second stage: Remove and drain the surface oil, re-vacuum to -0.08MPa, inject compound treatment agent, pressurize to 0.3-0.5MPa, soak for 3-4 hours to ensure the protective liquid penetrates to a depth of 5-8mm and forms a dense protective layer on the surface;

[0118] (3) Waste liquid recycling: After soaking, filter the remaining treatment agent in the tank with a 100-mesh filter, and add 0.2% tea seed extract and 0.1% rosin modified resin. The soaking waste liquid after the first soaking can be recycled 3 to 5 times.

[0119] 3. Secondary curing

[0120] After soaking, the board blank is first dried at a low temperature of 60℃ for 1.5 to 2.5 hours, and then placed in a constant temperature and humidity chamber of 40℃ and 50% humidity for 3.5 to 4.5 hours to allow the protective layer to fully combine with the bamboo fiber, thus producing the cutting board.

[0121] V. Post-processing and quality inspection

[0122] 1. Fine processing

[0123] Use a polishing machine to finely polish the surface and edges of the cutting board to ensure that the surface is smooth and burr-free, and the edges are rounded (radius 2-3mm) to obtain the bamboo cutting board product.

[0124] 2. Quality Inspection

[0125] Crack resistance test: According to GB / T 26909-2011, the total dry shrinkage rate is ≤1.5%, and no cracks are found after 1000 simulated chopping cycles;

[0126] Anti-mold test: According to GB / T 24128-2009, the control efficacy against Aspergillus niger and Trichoderma viride is ≥90%;

[0127] Structural inspection: The steel hoop and handle are firmly connected, the elastic fasteners are easily adjustable, and the handle shows no deformation during load-bearing tests;

[0128] Safety testing: According to GB4806.9-2016, the residues of camellia oil and treatment agents, as well as the formaldehyde migration of bamboo glue, are ≤0.05mg / dm², which meets the food contact safety standards.

[0129] 3. Packaging and warehousing

[0130] Pack the product in food-grade plastic film with heat sealing, with a thickness of 0.04–0.1 mm. Label the product with information and instructions for use. Store the product in a warehouse with an ambient humidity of 45%–60% and avoid direct sunlight.

[0131] In the above production method, the bamboo fiber residue is mixed into the next batch of bamboo glue for reuse, and the amount used does not exceed 30% of the total bamboo fiber.

[0132] In the above production method, after the waste soaking liquid is circulated 3 to 5 times, the final waste liquid can be used as a biomass pellet binder.

[0133] Disposal of discarded bamboo cutting board products:

[0134] (1) Bamboo recycling: Remove the metal parts from the scrapped cutting board, crush it into bamboo powder with a particle size of <1mm, mix it with the waste soaking liquid at a mass ratio of 100:5, and extrude and granulate it into biomass pellets; or the bamboo powder is cooked and pulped to make bamboo paper pulp.

[0135] (2) Metal parts recycling: Stainless steel hoops and handles are ultrasonically cleaned to remove residual protective layers, coated with protective coatings, and dried before being reassembled and used.

[0136] In some embodiments, a steel ring 2 is provided around the perimeter of the cutting board body 1.

[0137] In some embodiments, the two ends of the steel ring 2 are separated and connected by an elastic fastener 3. The elastic fastener 3 includes a connecting rod 31, a first rigid spring 32, and a second rigid spring 33. The steel ring 2 has a first interface and a second interface on both sides of its opening, and the connecting rod 31 passes through the first interface and the second interface. The first rigid spring 32 and the second rigid spring 33 are respectively sleeved on both ends of the connecting rod 31, with the first interface abutting against the first rigid spring 32 and the second interface abutting against the second rigid spring 33. The first rigid spring 32 and the second rigid spring 33 are respectively high-pressure stainless steel springs. One end of the connecting rod 31 is provided with a limiting fixing piece 311, and the other end is provided with an adjusting nut 312 and a locking nut 313. The connecting rod 31 has threads adapted to the adjusting nut 312 and the locking nut 313, and the connecting rod 31 and the rigid springs are assembled by adjusting the nut 312 and the locking nut 313.

[0138] In some embodiments, a handle 4 is provided on one side of the cutting board body 1.

[0139] In some embodiments, the handle 4 is mounted on the connecting rod 31.

[0140] The difference between the above-mentioned method and the method described above in the production process of the composite bamboo cutting board that is resistant to cracking and mildew is that:

[0141] In addition to the raw material and equipment preparation process, structural components also need to be prepared: 304 stainless steel hoops, high-pressure stainless steel springs (elastic coefficient 1.5-2.0N / mm), stainless steel connecting rods, limit fixing plates, adjusting nuts, locking nuts, and metal handles.

[0142] After composite molding or after anti-mildew and anti-cracking reinforcement treatment, the steel hoop and elastic fastener assembly process is carried out, which specifically includes:

[0143] (1) Steel hoop customization: 304 stainless steel hoop is customized according to the size of the slab, with reserved openings. The first interface and the second interface are opened on the steel hoop on both sides of the opening.

[0144] (2) Fastener assembly: Pass the connecting rod through the first interface and the second interface, and install the handle on the connecting rod. Then, put the first rigid spring and the second rigid spring on both ends of the connecting rod respectively. Install the limiting and fixing plate on one end, and install the adjusting nut and the locking nut on the other end in sequence. Adjust the spring preload through the thread.

[0145] (3) Slab assembly: Embed the slab after contouring into the steel hoop, adjust the adjusting nut to make the spring slightly tensioned to adapt to the subsequent expansion and contraction of the bamboo, and tighten the locking nut to fix it.

[0146] This invention features a steel hoop, double rigid springs, and a handle structure. The springs' elasticity adapts to the expansion and contraction of the bamboo. The preload can be precisely controlled by adjusting the nut and locking nut, preventing restricted bamboo expansion and contraction. The steel ring can also adapt to the thermal expansion and contraction of the bamboo, further reducing the risk of cracking. The design is easy to adjust, improving usability and structural durability.

[0147] The following comparative experiment will be conducted:

[0148] Example 1: Making a bamboo cutting board with steel hoop 2, elastic fastener 3 and handle 4, with specific control parameters as follows:

[0149] 1. The preparation of black bamboo blocks includes the following steps:

[0150] (1) Bamboo tube processing: Cut the bamboo into 30-50cm bamboo tubes, remove the outer and inner nodes, peel off the skin and cut into bamboo blocks with a width of 8cm and a thickness of 8mm;

[0151] (2) Pretreatment before carbonization: Soak bamboo blocks in 80℃ hot water for 1 hour to remove surface sugar and dust, and drain the surface moisture; after cutting, control the thickness deviation of bamboo blocks to ≤0.2mm;

[0152] (3) Step carbonization: Place the bamboo block into the carbonization furnace, introduce 99% pure nitrogen as a protective gas, raise the temperature to 100℃ at 5℃ / min, keep it at 1 hour to remove free water; raise the temperature to 155℃ and keep it at 4 hours to decompose nutrients such as starch; maintain the nitrogen atmosphere at the end of carbonization and let it cool naturally to below 80℃ before taking it out.

[0153] (4) Low temperature slow drying: Dry at 60℃ for 3 hours, then raise the temperature to 80℃ and dry for 2 hours;

[0154] (5) Surface treatment: Lightly sand with 240-grit sandpaper to remove the loose carbonized layer on the surface and expose the dense bamboo fiber.

[0155] 2. The preparation of white bamboo blocks includes the following steps:

[0156] (1) Bamboo tube processing: cut into bamboo blocks of the same size as the black bamboo blocks;

[0157] (2) Enhanced steaming: Add boiling water to the steaming pot, add tea seed cake water (made from tea seed cake) at a ratio of 5%, 0.3% mugwort essential oil and 0.5% salt, put in bamboo blocks and steam for 2.5 hours to remove easily moldy substances and penetrate natural antibacterial components;

[0158] (3) Drying and shaping: First, let it air dry naturally, then put it into a 50℃ drying equipment for drying;

[0159] (4) Surface treatment: Quickly rinse the residual impurities with clean water, dry with hot air, roughen the bonding surface with 180-grit sandpaper, and then lightly brush a layer of diluted modified soybean protein glue (original glue: water = 1:3) as a base coat.

[0160] 3. The preparation of bamboo fiber includes the following steps:

[0161] (1) Waste collection: collect scraps (length < 5cm) and bamboo green / bamboo yellow planing waste generated during the bamboo cutting, carbonization and steaming process;

[0162] (2) Preparation of bamboo green antibacterial liquid: It is prepared by soaking bamboo green / bamboo yellow planing waste in hot water at 80℃ for 2.5 hours. The final solid-liquid ratio of bamboo green antibacterial liquid is 1:10.

[0163] (3) Bamboo fiber processing: After the scraps are crushed, they are dried at 105℃ until the moisture content is ≤5%, and then soaked in a mixture of silane coupling agent solution and bamboo antibacterial liquid for 5 minutes. The content of silane coupling agent in the mixture is 0.5%, and the content of bamboo antibacterial liquid is 0.3%.

[0164] (4) Antibacterial enhancement: After the scraps are taken out and dried, they are soaked in 0.2% ε-polylysine solution for 3 minutes and then dried for later use.

[0165] 4. Bamboo adhesive preparation: Mix bamboo fiber, modified soybean protein adhesive, and deionized water at a mass ratio of 8:100:18, and stir for 15 minutes using a high-speed disperser at 1500 rpm to ensure uniform dispersion of bamboo fiber without clumping or sedimentation. Apply adhesive during the assembly process, with an adhesive application rate of 180 g / m² on the bonding surface.

[0166] 5. Hot pressing bonding includes the following steps:

[0167] (1) Place the slab in a hot press for hot pressing. The parameters include: hot press temperature 135℃, pressure 13MPa, and hot pressing time 50 minutes.

[0168] (2) Heat preservation and curing: After hot pressing, the board is placed in a constant temperature environment of 60℃ for 2 hours to allow the bamboo glue to cure slowly and avoid the formation of bubbles or voids.

[0169] 6. The preparation of the compound treatment agent includes the following steps:

[0170] (1) Base liquid: Mix woody camellia oil and edible wax evenly at a mass ratio of 7:3, and heat to 100℃ to melt;

[0171] (2) Compound modification: Based on the base liquid, add 0.8% tea seed extract, 0.4% artemisia oil, 2.5% rosin modified resin and 1.5% nano silica. After stirring evenly, the compound treatment agent is obtained and kept warm at 80℃ for later use.

[0172] 7. The staged vacuum pressure soaking process includes the following steps:

[0173] (1) First stage: Place the slab after contouring into a vacuum pressure tank, vacuum the tank to -0.08MPa, maintain for 30 minutes, inject pure camellia oil heated to 100℃, soak for 2.5 hours to allow the oil to penetrate deeply and form a deep nourishing and protective layer;

[0174] (2) Second stage: Remove and drain the surface oil, re-vacuum to -0.08MPa, inject compound treatment agent, pressurize to 0.4MPa, soak for 3.5 hours to ensure the protective liquid penetrates to a depth of 5-8mm and forms a dense protective layer on the surface;

[0175] (3) Waste liquid recycling: After soaking, filter the remaining treatment agent in the tank with a 100-mesh filter, and add 0.2% tea seed extract and 0.1% rosin modified resin. The soaking waste liquid after the first soaking can be recycled 3 to 5 times.

[0176] 8. Secondary curing: The soaked board blank is first dried at a low temperature of 60℃ for 2 hours, and then placed in a constant temperature and humidity chamber of 40℃ and 50% humidity for 4 hours to allow the protective layer to fully combine with the bamboo fiber, thus producing the cutting board.

[0177] 9. After installing the steel hoop 2, elastic fastener 3 and handle 4, use a polishing machine to finely polish the surface and edges of the cutting board to obtain the final bamboo cutting board.

[0178] Example 2: The difference from Example 1 is that:

[0179] 1. When preparing black bamboo blocks, after peeling, cut them into bamboo blocks with a width of 6.5cm and a thickness of 5mm; in the pretreatment step before carbonization, soak the bamboo blocks in 75℃ hot water for 1.5 hours; in the stepped carbonization step, raise the temperature to 95℃ at 5℃ / min and keep it at that temperature for 1.5 hours; then raise the temperature to 150℃ and keep it at that temperature for 4 hours; in the low-temperature slow drying step, dry at 55℃ for 3.5 hours, and then raise the temperature to 75℃ and dry for 2.5 hours.

[0180] 2. When preparing white bamboo blocks, in the enhanced steaming step, put the bamboo blocks in and steam for 2 hours; in the drying and shaping step, put them in a 45℃ drying equipment to dry.

[0181] 3. In the preparation of bamboo fiber, in the preparation step of bamboo green antibacterial liquid, it is soaked in hot water at 75℃ for 3 hours; in the bamboo fiber processing step, it is dried at 100℃ and then soaked in a mixture of silane coupling agent solution and bamboo green antibacterial liquid for 4 minutes; in the antibacterial strengthening step, it is soaked in 0.2% ε-polylysine solution for 2 minutes.

[0182] 4. When preparing the bamboo adhesive, mix bamboo fiber, modified soybean protein adhesive, and deionized water at a mass ratio of 8:100:15, and stir for 20 minutes using a high-speed disperser at 1500 rpm. Apply the adhesive during the assembly process, with an application rate of 150 g / m² on the bonding surface.

[0183] 5. When hot-pressing, the parameters include: hot press temperature 130℃, pressure 15MPa, and hot pressing time 60 minutes.

[0184] 6. When preparing the compound treatment agent, add 0.5% tea seed cake extract, 0.3% Artemisia argyi essential oil, 2% rosin modified resin, and 1% nano silica, based on the base solution.

[0185] 7. During the staged vacuum pressure soaking, in the first stage, the vacuum pressure tank is evacuated to -0.08MPa and maintained for 25 minutes. Pure camellia oil heated to 100℃ is then injected and soaked for 2 hours. In the second stage, the compound treatment agent is injected, the pressure is increased to 0.3MPa, and the soaking time is 4 hours.

[0186] 8. Secondary curing: After soaking, the slab is first dried at a low temperature of 60℃ for 1.5 hours, and then placed in a constant temperature and humidity chamber at 40℃ and 50% humidity for 3.5 hours.

[0187] Everything else is the same as in Example 1.

[0188] Example 3: The difference from Example 1 is that:

[0189] 1. When preparing black bamboo blocks, after peeling, cut them into bamboo blocks with a width of 6.5cm and a thickness of 5mm; in the pretreatment step before carbonization, soak the bamboo blocks in 75℃ hot water for 1.5 hours; in the stepped carbonization step, raise the temperature to 95℃ at 5℃ / min and keep it at that temperature for 1.5 hours; then raise the temperature to 150℃ and keep it at that temperature for 4 hours; in the low-temperature slow drying step, dry at 55℃ for 3.5 hours, and then raise the temperature to 75℃ and dry for 2.5 hours.

[0190] 2. When preparing white bamboo blocks, in the enhanced steaming step, put the bamboo blocks in and steam for 3 hours; in the drying and shaping step, put them in a 55℃ drying equipment to dry.

[0191] 3. In the preparation of bamboo fiber, in the preparation step of bamboo green antibacterial liquid, it is soaked in hot water at 85℃ for 2 hours; in the bamboo fiber processing step, it is dried at 1010℃ and then soaked in a mixture of silane coupling agent solution and bamboo green antibacterial liquid for 8 minutes; in the antibacterial strengthening step, it is soaked in 0.2% ε-polylysine solution for 4 minutes.

[0192] 4. When preparing the bamboo adhesive, mix bamboo fiber, modified soybean protein adhesive, and deionized water at a mass ratio of 8:100:20, and stir for 12 minutes using a high-speed disperser at 1500 rpm. Apply the adhesive during the assembly process, with an application rate of 200 g / m² on the bonding surface.

[0193] 5. When hot-pressing, the parameters include: hot press temperature 140℃, pressure 12MPa, and hot pressing time 45 minutes.

[0194] 6. When preparing the compound treatment agent, add 1% tea seed cake extract, 0.5% Artemisia argyi essential oil, 3% rosin modified resin, and 2% nano silica to the base solution as the standard.

[0195] 7. During the staged vacuum pressure soaking, in the first stage, the vacuum pressure tank is evacuated to -0.08MPa and maintained for 35 minutes. Pure camellia oil heated to 100℃ is then injected and soaked for 3 hours. In the second stage, the compound treatment agent is injected, the pressure is increased to 0.5MPa, and the soaking is carried out for 3 hours.

[0196] 8. Secondary curing: After soaking, the slab is first dried at a low temperature of 60℃ for 2.5 hours, and then placed in a constant temperature and humidity chamber at 40℃ and 50% humidity for 4.5 hours.

[0197] Everything else is the same as in Example 1.

[0198] Comparative Example 1: The difference from Example 1 is that:

[0199] No bamboo fiber is prepared, nor is bamboo glue formulated; instead, modified soybean protein glue is used directly for bonding.

[0200] Everything else is the same as in Example 1.

[0201] Comparative Example 2: The difference from Example 1 is that:

[0202] After staged vacuum pressure soaking, the remaining treatment agent in the tank is filtered through a 100-mesh filter and then reused directly.

[0203] Everything else is the same as in Example 1.

[0204] Comparative Example 3: The difference from Example 1 is that:

[0205] During the second stage of soaking, the soaking solution is only a base solution made of woody camellia oil and edible wax.

[0206] Everything else is the same as in Example 1.

[0207] Comparative Example 4: The difference from Example 1 is that:

[0208] The soaking is not done in stages; the patient is directly soaked in the compound treatment agent in one step, thus eliminating the first soaking step.

[0209] Everything else is the same as in Example 1.

[0210] Comparative Example 5: The difference from Example 1 is that:

[0211] The main body of the cutting board is made using only 11 pieces of white bamboo.

[0212] Everything else is the same as in Example 1.

[0213] Comparative Example 6: The difference from Example 1 is that:

[0214] The main body of the cutting board is made using only 12 sets of black bamboo blocks.

[0215] Everything else is the same as in Example 1.

[0216] Comparative Example 7: The difference from Example 1 is that:

[0217] In the preparation of black bamboo blocks, the step-by-step carbonization is changed to one-time carbonization: the bamboo blocks are placed in a carbonization furnace, 99% pure nitrogen is introduced as a protective gas, the temperature is raised to 155℃ at 5℃ / min and kept at that temperature for 4 hours to decompose nutrients such as starch; at the end of the carbonization, the nitrogen atmosphere is maintained and the temperature is naturally cooled to below 80℃ before being taken out.

[0218] Everything else is the same as in Example 1.

[0219] Comparative Example 8: The difference from Example 1 is that:

[0220] In the preparation of white bamboo blocks, tea seed cake water, mugwort essential oil and salt are not added during steaming; boiling water is used directly for steaming.

[0221] Everything else is the same as in Example 1.

[0222] Comparative Example 9: The difference from Example 1 is that:

[0223] In the hot pressing bonding step, the temperature of the hot press is 150℃.

[0224] Everything else is the same as in Example 1.

[0225] Comparative tests were conducted on the cutting board products of Examples 1-3 and Comparative Examples 1-9:

[0226] (1) Total dry shrinkage rate

[0227] According to GB / T26909-2011, the sample was dried at 103℃ to constant weight, the dimensional changes before and after drying were measured, and the shrinkage rate was calculated.

[0228] (2) Simulated chopping crack resistance

[0229] Referring to GB / T26909-2011, a 5kg impact hammer was used to repeatedly chop the central area of ​​the cutting board 1000 times, and the cracks were observed.

[0230] (3) Anti-mildew efficacy (Aspergillus niger / Trichoderma viride)

[0231] Referring to GB / T24128-2009, the samples were inoculated with mold spore suspension and cultured in an environment of 28℃ and 90% humidity for 28 days, and the mold growth inhibition rate was calculated.

[0232] (4) Adhesion strength

[0233] Referring to GB / T14074-2017, a shear strength test was conducted with a loading speed of 2 mm / min, and the maximum stress at failure was recorded.

[0234] (5) Safe residual migration amount (camellia oil / treatment agent)

[0235] According to GB4806.9-2016, the migration amount was detected by soaking in 4% acetic acid for 24 hours and then by high performance liquid chromatography.

[0236] (6) Waste utilization rate

[0237] The calculation formula is: (mass of recycled bamboo fiber + amount of recycled waste liquid + amount of recycled waste products) / total amount of waste generated × 100%.

[0238] (7) Durability of protective layer

[0239] The samples were subjected to 50 cycles of cold and heat (cold: placed at -5℃ for 2 hours; heat: placed at 60℃ for 2 hours) + 100 water washes (rinsing with running water for 5 minutes), and the anti-mildew efficacy and shrinkage rate were retested.

[0240] Experimental data are shown in Table 1 and Figures 4-7 As shown:

[0241] Table 1 Test Data Table for Examples and Comparative Examples

[0242] Sample number Total dry shrinkage rate (%) Simulated chopping 1000 times and cracking results Anti-mold efficacy (Aspergillus niger / Trichoderma viride, %) Adhesion strength <![CDATA[Safety residual migration amount (mg / dm 2 )]]> Waste utilization rate (%) Protective layer durability (%) Example 1 1.2 No cracks 96 / 95 3.8 0.03 85 92 / 91 Example 2 1.3 No cracks 95 / 94 3.7 0.04 83 91 / 90 Example 3 1.1 No cracks 97 / 96 3.9 0.02 86 93 / 92 Comparative Example 1 1.8 Two microcracks appeared 82 / 80 2.5 0.03 50 75 / 73 Comparative Example 2 1.3 No cracks 88 / 86 3.7 0.04 84 78 / 76 Comparative Example 3 1.6 One microcrack appeared 89 / 87 3.6 0.03 85 80 / 79 Comparative Example 4 2.1 A noticeable crack appeared 85 / 83 3.5 0.03 85 76 / 74 Comparative Example 5 2.8 Three microcracks appeared 90 / 88 3.2 0.03 84 83 / 81 Comparative Example 6 2.0 One microcrack appeared 79 / 77 3.3 0.03 85 72 / 70 Comparative Example 7 2.2 Two microcracks appeared 83 / 81 3.4 0.03 85 77 / 75 Comparative Example 8 1.4 No cracks 78 / 76 3.6 0.03 85 69 / 67 Comparative Example 9 1.9 Two microcracks appeared 92 / 90 2.8 0.05 85 88 / 86

[0243] Note: The length of a microcrack is <1cm, and the length of an obvious crack is greater than or equal to 1cm.

[0244] From Table 1 and Figures 4-7 It can be known that:

[0245] (1) Comparing Comparative Example 1 with Example 1, it can be seen that Comparative Example 1 has poorer total dry shrinkage, bonding strength, and protective layer durability. This is because the addition of bamboo fiber can not only enhance the bonding strength of bamboo glue, but also impart long-lasting antibacterial properties through the modification of bamboo green antibacterial liquid and ε-polylysine. Without bamboo fiber, the bonding surface structure is loose, which easily generates internal stress, leading to an increase in the dry shrinkage rate. The antibacterial components lack a carrier, and the antifungal efficacy and durability are significantly reduced.

[0246] (2) Comparing Comparative Example 2 with Example 1, it can be seen that Comparative Example 2 has poor anti-mildew efficacy and protective layer durability. This is because the effective components such as tea seed extract and rosin modified resin in the recycled waste liquid will naturally decay. When not replenished, the effective concentration of the protective layer is insufficient, resulting in a decrease in both anti-mildew efficacy and durability.

[0247] (3) Comparing Comparative Example 3 with Example 1, it can be seen that Comparative Example 3 has poor dry shrinkage rate, mildew prevention efficacy and protective layer durability. This is because the base liquid can only form a simple barrier layer and lacks antibacterial components and structural reinforcing agents, resulting in insufficient surface protection, increased dry shrinkage rate, and decreased mildew prevention efficacy and durability.

[0248] (4) Comparing Comparative Example 4 with Example 1, it can be seen that Comparative Example 4 has poor dry shrinkage rate, crack resistance, mildew resistance and protective layer durability. This is because a single soaking cannot achieve deep nourishment and surface density dual protection. The uneven penetration depth of the compound treatment agent leads to a significant increase in dry shrinkage rate and a significant decrease in crack resistance and mildew resistance durability.

[0249] (5) Comparing Comparative Example 5 with Example 1, it can be seen that Comparative Example 5 has poor dry shrinkage rate and crack resistance. This is because although the white bamboo block contains natural antibacterial components, its stability is insufficient. The single white bamboo block cannot disperse the internal stress generated by thermal expansion and contraction, resulting in a significant increase in dry shrinkage rate and a significant decrease in crack resistance.

[0250] (6) Comparing Comparative Example 6 with Example 1, it can be seen that Comparative Example 6 has poor total dry shrinkage rate, mildew prevention effect and protective layer durability. This is because black bamboo blocks have strong stability but insufficient antibacterial components. The single black bamboo assembly leads to a decrease in mildew prevention effect and a significant decline in durability.

[0251] (7) Comparing Comparative Example 7 with Example 1, it can be seen that Comparative Example 7 has poor dry shrinkage rate, mildew resistance and crack resistance. This is because one-time carbonization cannot accurately remove free water and starch, and the bamboo fiber structure is loose, which leads to an increase in dry shrinkage rate and a decrease in mildew resistance and crack resistance.

[0252] (8) Comparing Comparative Example 8 with Example 1, it can be seen that Comparative Example 8 has poor anti-mildew efficacy and protective layer durability. This is because no natural antibacterial ingredients were added, and the white bamboo block could not peel off easily moldy substances and form an antibacterial layer, resulting in a significant decrease in anti-mildew efficacy and the worst durability.

[0253] (9) Comparing Comparative Example 9 with Example 1, it can be seen that Comparative Example 9 has poor total dry shrinkage, bonding strength and crack resistance. This is because high temperature causes bamboo glue to cure too quickly, resulting in uneven bonding, internal stress, reduced bonding strength, increased shrinkage and decreased crack resistance.

[0254] (10) Comparing Examples 2 and 3 with Example 1, it can be seen that the core indicators (drying shrinkage rate, anti-mildew efficacy, adhesive strength, etc.) of the three are very similar, no cracks are generated, the safe residual migration amount meets the standard, the waste utilization rate is >80%, and the durability of the protective layer is stable. Therefore, the range of technical parameters defined by the present invention has good stability and compatibility. Even if the parameters fluctuate within a reasonable range, the excellent performance of the product can still be guaranteed, which reflects the practicality and reliability of the technical solution.

[0255] In summary, the synergistic effect of bamboo fiber recycling and antibacterial modification, alternating arrangement of double bamboo blocks, stepped carbonization and enhanced cooking, staged vacuum pressure soaking, compound treatment agent modification, and waste liquid replenishment and recycling results in a product with a total dry shrinkage rate of ≤1.3%, anti-mildew efficacy of ≥94%, adhesive strength of ≥3.7MPa, and waste utilization rate of ≥83%. Its overall performance far surpasses that of comparative products lacking a single technological feature. All products in the examples use food-grade natural raw materials, with a safe residual migration level of ≤0.04mg / dm², meeting standards and resolving the safety hazards of existing technologies. The overall waste utilization rate is >80%, achieving green and environmentally friendly production.

[0256] The present invention has been described by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A composite bamboo cutting board that is crack-resistant and mildew-resistant, comprising a cutting board body (1), characterized in that: The cutting board body (1) is made of alternating white bamboo blocks (11) and black bamboo blocks (12), and the bamboo glue used for bonding the blanks is modified soybean protein glue, and bamboo fiber prepared by antibacterial modification of bamboo processing waste is mixed in the bamboo glue; the bamboo fiber is made from the scraps and bamboo green / bamboo yellow planing waste generated in the bamboo block cutting, carbonization and steaming process, which are then soaked in a mixture of silane coupling agent and bamboo green antibacterial liquid and antibacterial strengthening with ε-polylysine solution; the cutting board body (1) has a deep nourishing protective layer and a surface dense protective layer formed by staged vacuum pressure impregnation, the deep nourishing protective layer is formed by vacuum penetration of pure camellia oil, and the surface dense protective layer is formed by pressure penetration of woody camellia oil, edible wax, tea seed extract, mugwort essential oil, rosin modified resin and nano silica compound treatment agent.

2. The composite bamboo cutting board with anti-cracking and anti-mildew properties according to claim 1, characterized in that: Both the white bamboo block (11) and the black bamboo block (12) are placed vertically, with their large end faces serving as the bonding surfaces and their small side faces located on the end face of the cutting board body (1) used for cutting vegetables.

3. The composite bamboo cutting board with anti-cracking and anti-mildew properties according to claim 1, characterized in that: The white bamboo blocks (11) and black bamboo blocks (12) are alternately pasted and glued in one direction to form a unit block, and multiple unit blocks are arranged and glued to form the cutting board body (1); the bamboo blocks of each two adjacent unit blocks are arranged in the same or different directions.

4. The composite bamboo cutting board with anti-cracking and anti-mildew properties according to claim 1, characterized in that: The cutting board body (1) is surrounded by a steel ring (2); And / or, the cutting board body (1) is provided with a handle (4) on one side.

5. The composite bamboo cutting board with anti-cracking and anti-mildew properties according to claim 4, characterized in that: The two ends of the steel ring (2) are connected by elastic fasteners (3). The elastic fasteners (3) include a connecting rod (31), a first rigid spring (32) and a second rigid spring (33). The connecting rod (31) passes through both ends of the steel ring (2). The first rigid spring (32) and the second rigid spring (33) are respectively sleeved on both ends of the connecting rod (31). One end of the connecting rod (31) is provided with a limiting fixing piece (311), and the other end is provided with an adjusting nut (312) and a locking nut (313). The connecting rod (31) is provided with threads that are adapted to the adjusting nut (312) and the locking nut (313).

6. A method for manufacturing a composite bamboo cutting board with anti-cracking and anti-mildew properties as described in any one of claims 1-5, characterized in that: This includes raw material pretreatment, composite molding, mildew and crack prevention strengthening treatment, and post-processing procedures; The raw material pretreatment process includes the following steps for bamboo fiber preparation: (1) Waste collection: collect scraps and waste materials from bamboo cutting, carbonization and steaming processes; (2) Preparation of bamboo green antibacterial liquid: It is prepared by soaking bamboo green / bamboo yellow planing waste in hot water at 75-85℃ for 2-3 hours. The final solid-liquid ratio of bamboo green antibacterial liquid is 1:

10. (3) Bamboo fiber processing: After the scraps are crushed, they are dried at 100-110℃ until the moisture content is ≤5%, and then soaked in a mixture of silane coupling agent solution and bamboo antibacterial liquid for 4-8 minutes; (4) Antibacterial enhancement: After the scraps are taken out and dried, they are soaked in ε-polylysine solution for 2-4 minutes and then dried for later use; In the composite molding process, when preparing bamboo glue, the prepared bamboo fiber, modified soybean protein glue, and deionized water are mixed at a mass ratio of 8:100:15-20 and dispersed evenly by a high-speed disperser without clumping or sedimentation to obtain bamboo glue; the bamboo glue is used to coat the bonding surfaces of white bamboo block (11) and black bamboo block (12).

7. The method for manufacturing a crack-resistant and mildew-resistant composite bamboo cutting board according to claim 6, characterized in that: The raw material pretreatment process includes the following steps for preparing black bamboo blocks: (1) Bamboo tube processing: Cut the bamboo into bamboo tubes, remove the outer and inner nodes, peel off the skin and cut into bamboo blocks with a width of 6.5-10cm and a thickness of 5-10mm; (2) Pretreatment before carbonization: Soak bamboo blocks in hot water at 75-85℃ for 0.8-1.5 hours to remove surface sugar and dust, and drain the surface moisture; after cutting, control the thickness deviation of bamboo blocks to ≤0.2mm; (3) Step carbonization: Place the bamboo blocks into the carbonization furnace, introduce 99% pure nitrogen as a protective gas, raise the temperature to 95-105℃ at 5℃ / min, keep it at 1-1.5 hours to remove free water; then raise the temperature to 150-160℃ and keep it at 4 hours to decompose nutrients such as starch; at the end of the carbonization, maintain the nitrogen atmosphere and let it cool naturally to below 80℃ before taking it out. (4) Low-temperature slow drying: Dry at 55-65℃ for 2.5-3.5 hours, then raise the temperature to 75-85℃ and dry for 1.5-2.5 hours, controlling the moisture content to 8%-10%; (5) Surface treatment: Lightly sand with 240-grit sandpaper to remove the loose carbonized layer on the surface and expose the dense bamboo fiber; And / or, in the raw material pretreatment process, the preparation of white bamboo blocks includes the following steps: (1) Bamboo tube processing: cut into bamboo blocks of the same size as the black bamboo blocks; (2) Enhanced steaming: Add boiling water to the steaming pot, add tea seed water, 0.3% mugwort essential oil and 0.5% salt at a ratio of 5%, put in bamboo pieces and steam for 2-3 hours to remove easily moldy substances and penetrate natural antibacterial components; (3) Drying and shaping: First, air dry naturally, then put it into a drying equipment at 45-55℃ to dry, controlling the moisture content to 9%-11%; (4) Surface treatment: Quickly rinse the residual impurities with clean water, dry with hot air, roughen the bonding surface with 180-grit sandpaper, and then lightly brush a layer of diluted modified soybean protein glue as a base coat. And / or, after the black bamboo block (12) and white bamboo block (11) are assembled, they are hot-pressed together. The hot-pressing temperature is 130-140℃, the pressure is 12-15MPa, and the hot-pressing time is 45-60 minutes.

8. The method for manufacturing a crack-resistant and mildew-resistant composite bamboo cutting board according to claim 6, characterized in that: In the aforementioned mildew-proof and crack-resistant strengthening treatment process, the preparation of the compound treatment agent includes the following steps: (1) Base liquid: Mix woody camellia oil and edible wax evenly at a mass ratio of 7:3, and heat to 100℃ to melt; (2) Compound modification: Based on the base solution, add 0.5% to 1% tea seed extract, 0.3% to 0.5% artemisia oil, 2% to 3% rosin modified resin, and 1% to 2% nano silica. After stirring evenly, the compound treatment agent is obtained and kept warm at 80°C for later use. And / or, in the anti-mildew and anti-crack strengthening treatment process, the staged vacuum pressure impregnation includes the following steps: (1) First stage: Place the composite molded slab into a vacuum pressure tank, evacuate the vacuum pressure tank to -0.08MPa, maintain for 25 to 35 minutes, inject pure camellia oil heated to 100℃, soak for 2 to 3 hours to allow the oil to penetrate deeply; (2) Second stage: Remove and drain the surface oil, re-vacuum to -0.08MPa, inject compound treatment agent, pressurize to 0.3-0.5MPa, soak for 3-4 hours, so that the protective liquid penetrates to a depth of 5-8mm; (3) Waste liquid recovery: After soaking, filter the remaining treatment agent in the tank with a 100-mesh filter and add 0.2% tea seed extract and 0.1% rosin modified resin.

9. A method for manufacturing a crack-resistant and mildew-resistant composite bamboo cutting board according to claim 8, characterized in that: In the anti-mildew and anti-cracking strengthening process, the waste soaking liquid after being vacuum-pressurized and reused 3 to 5 times is used as a biomass pellet binder. After the composite bamboo cutting board is scrapped, the recycling method includes: after removing the metal parts, the bamboo is crushed into bamboo powder with a particle size of <1mm, and mixed with the waste soaking liquid at a mass ratio of 100:5 and extruded to granulate into biomass pellets.

10. A method for manufacturing a crack-resistant and mildew-resistant composite bamboo cutting board according to claim 6, characterized in that: After composite molding or after anti-mildew and anti-cracking reinforcement treatment, the steel hoop and elastic fastener assembly process is carried out.

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