Production process of bamboo-woven calligraphy and painting

Abstract

The application discloses a bamboo-woven calligraphy and painting production process, which uses Dendrocalamopsis oldhami as raw material, and is characterized in that, on the basis of traditional bamboo selection, cutting, green removal, layering, three-protection, dyeing, filament separation, weaving and mounting processes, a bamboo splint base composite modification treatment process is additionally arranged after the layering process and before the three-protection process, and a film forming treatment process is additionally arranged after the dyeing process; the base composite modification treatment adopts a composite modification liquid containing baking soda, rice washing water and pueraria powder to soak the bamboo blank splint, and then the bamboo blank splint is soaked in a lactic acid aqueous solution and drained; the film forming treatment adopts a composite coating liquid containing konjac gum, white beeswax, fine rice powder and sodium carboxymethyl cellulose to brush the bamboo splint surface to form a protective film. The process improves the wettability and flexibility of the bamboo splint through base modification, improves the filament separation yield, enhances the natural dye fixing effect through optimization of the dyeing process, and the flexible protective coating is suitable for the fine weaving requirement of the bamboo-woven calligraphy and painting, significantly improves the problems of poor dye fixing and easy cracking and peeling of the coating in the traditional process, and improves the quality stability and storage life of the bamboo-woven calligraphy and painting.

Description

Technical Field

[0001] This invention belongs to the field of bamboo product processing technology, specifically a bamboo weaving calligraphy and painting production process. Background Technology

[0002] Gaoping bamboo weaving calligraphy and painting is a distinctive intangible cultural heritage of Changle Town, Gaoping District, Nanchong City, Sichuan Province. It uses fine-fibered, highly resilient Ci bamboo as its primary raw material, and is meticulously crafted through over thirty purely handmade processes, including bamboo selection, cutting, removing the outer green layer, layering, dyeing, separating the fibers, weaving, and mounting. With its delicate bamboo strips, exquisite weaving, and vivid patterns, this bamboo weaving calligraphy and painting is a handicraft that combines artistic appreciation, cultural heritage, and local characteristics, and is a typical representative of folk bamboo weaving techniques in my country. The traditional production process of Gaoping bamboo weaving calligraphy and painting has been passed down for a long time and has formed a mature manual operation system, capable of meeting the needs of appreciation and use in traditional settings. However, with the increasing popularity of green technology concepts, the market's requirements for the stability and color uniformity of intangible cultural heritage handicrafts are constantly increasing, and the limitations of traditional techniques are gradually becoming apparent. There are still technical problems that urgently need to be solved in key aspects such as bamboo strip base treatment, dye application, and protective modification, as detailed below: Firstly, existing conventional processes for treating the base of bamboo strips are limited to basic physical operations such as scraping, polishing, and thinning. While these operations can remove some of the wax on the surface of the bamboo strips, they cannot completely remove it. Furthermore, they do not address the inherent characteristics of bamboo fibers, such as residual wax, high lignin content, poor wettability, and uneven fiber bonding. This leads to two technical problems: Firstly, whether using conventional dyes or natural plant dyes as alternatives, the poor wettability and unresolved fiber characteristics of bamboo strips prevent the dyes from evenly wetting and deeply penetrating, resulting in only surface adhesion. This leads to localized color accumulation, uneven color, and extremely poor color fixation, making the strips prone to fading and blurring during subsequent sliver splitting and weaving processes, affecting the visual quality of the finished product. Secondly, insufficient base treatment also causes defects such as fuzzing, breakage, and uneven thickness in the sliver splitting process, reducing the yield of the split strips and increasing the difficulty and cost of subsequent weaving processes.

[0003] Secondly, in response to the prominent defects of natural dyes, such as poor color fixation and easy fading and color bleeding, a few companies in the industry have attempted to add an additional protective coating after conventional basic treatment and dyeing to lock in the dye and improve the color stability and lifespan of bamboo-woven calligraphy and paintings. However, most existing protective coatings are based on the hard, thick film design of ordinary bamboo products and are not customized to take into account the delicate weaving characteristics of bamboo strips that need to be repeatedly bent and interlaced. They also do not modify or optimize the bamboo strip base. After the coating is formed, it is too rigid and not flexible enough. It is very easy to crack and peel during the splitting and weaving process. This will not only make the coating completely lose its protective function, but the peeling coating debris will also scratch the strips after they are split and the dye layer that is not firmly attached, further damaging the quality of the finished product.

[0004] Therefore, it is of great significance to develop a bamboo weaving calligraphy and painting production process that can significantly improve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide a bamboo weaving calligraphy and painting production process that significantly improves the technical problems of insufficient bamboo strip base treatment, poor color fixation of natural dyes, and poor compatibility between protective coatings and fine weaving in traditional processes, thereby improving the yield of bamboo weaving calligraphy and painting filaments, color stability, and quality durability.

[0006] The objective of this invention is achieved through the following technical solution: A bamboo weaving calligraphy and painting production process, using Cizhu bamboo as raw material, includes traditional bamboo selection, cutting, removing the green outer layer, layering, three-proofing, dyeing, separating fibers, weaving, and mounting processes; A bamboo strip substrate composite modification treatment process is added after the layering process and before the three-proof process, and a film-forming treatment process is added after the dyeing process. The specific steps of the composite modification treatment of the bamboo strip base are as follows: Take the layered bamboo strips and soak them in the composite modification solution at room temperature. After soaking, take out the bamboo strips, rinse them gently with clean water until they are no longer slippery, and then soak them in the lactic acid solution at room temperature. After taking them out, let them drain naturally. The composite modified liquid includes baking soda, rice water, and kudzu root powder; The dyeing process is as follows: After the bamboo strips have undergone the three-proof process, they are placed in the dyeing solution and boiled. After the dyeing is completed, they are cooled naturally, taken out and air-dried in the shade. The dyeing solution includes natural plant dyes, citric acid, glutinous rice paste, and astragalus polysaccharide. The film-forming process is as follows: The composite coating liquid is evenly brushed onto the surface of the dyed bamboo strips and placed in a ventilated environment to form a protective film naturally. The composite coating liquid includes konjac gum, white beeswax, fine rice flour, and sodium carboxymethyl cellulose.

[0007] Preferably, in the composite modified liquid, the mass fraction of baking soda is 0.7%-1.2%, the mass fraction of rice water is 18%-30%, and the mass fraction of kudzu root powder is 0.2%-0.6%.

[0008] Preferably, the mass fraction of the lactic acid aqueous solution is 0.08%–0.12%.

[0009] Preferably, the boiling and dyeing solution contains 3%–8% natural plant dyes, 0.2%–0.6% citric acid, 2%–6% glutinous rice paste, and 0.1%–0.5% astragalus polysaccharide. During dyeing, the boiling temperature is 80-95℃ and the boiling time is 25-40 minutes.

[0010] Preferably, the bamboo strips after dyeing and air-drying need to undergo starch dispersion treatment, specifically: lightly brush the surface of the bamboo strips 1-2 times with a 0.04wt%-0.06wt% sodium carboxymethyl cellulose solution, and then air-dry them in the shade.

[0011] In practice, bamboo strips after dyeing and air-drying are prone to retaining glutinous rice starch. This starch tends to agglomerate with the fine rice flour used in the subsequent film-forming process, resulting in uneven coating thickness and affecting the smoothness of the bamboo strip weaving. This application addresses this issue by using a starch dispersion treatment. A diluted sodium carboxymethyl cellulose solution, which is homologous to the film-forming component, is lightly brushed onto the surface of the bamboo strips and then allowed to air-dry in a ventilated location. This effectively disperses the residual glutinous rice starch from the dyeing process, reduces the tendency for starch agglomeration, and improves surface uniformity.

[0012] Preferably, in the composite coating liquid, the mass fraction of konjac gum is 1.2%–2.5%, the mass fraction of white beeswax is 0.6%–1.2%, the mass fraction of fine rice flour is 0.2%–0.6%, and the mass fraction of sodium carboxymethyl cellulose is 0.08%–0.22%.

[0013] Preferably, the composite coating liquid further includes 0.02%–0.06% by mass of Artemisia argyi extract.

[0014] In practice, after substrate modification, dyeing, and film formation, a small amount of starchy substances may remain between the bamboo fibers and on the surface. During long-term storage, these substances are susceptible to microbial contamination and mold growth, thus affecting the shelf life of bamboo-woven calligraphy and paintings. This application addresses this by adding Artemisia argyi extract to the composite coating solution. Utilizing its natural antibacterial properties, it effectively inhibits microbial growth, reduces the risk of mold growth, and improves the storage stability of the finished product.

[0015] Preferably, the thickness of the protective film is 2-5 μm.

[0016] Preferably, the glutinous rice paste is a thin paste made by boiling glutinous rice and water at a mass ratio of 1:(4-6) until it becomes slightly thick and then filtering it; the fine rice flour is 700-900 mesh rice flour.

[0017] Preferably, the natural plant dyes are selected according to the color requirements of the finished product: black is made from gallnut extract, red from sappanwood extract, and coffee from walnut shell extract.

[0018] Compared with the prior art, the beneficial effects of the present invention are: The process provided by this invention can effectively solve the technical problems such as poor dye fixation caused by the lack of base treatment of the bamboo strips in traditional processes. The specific beneficial effects are as follows: Firstly, in the composite modification process of the bamboo strip base, baking soda can saponify and disperse residual wax on the surface of the bamboo strips, improving the wettability and uniformity of the fiber surface. The polysaccharides in rice water can help improve the hydrophilicity of the bamboo strip surface, facilitating the penetration of subsequent treatment solutions. The natural polysaccharides in kudzu root powder can penetrate into the gaps between bamboo strip fibers, enhancing the inter-fiber bonding force, improving the flexibility of the bamboo strips, and reducing the risk of breakage and pilling during filament separation.

[0019] Lactic acid solution can wash away excess kudzu root powder residue on the surface of bamboo strips, preventing residue from hindering the penetration of the three-proof solution and dye solution, making subsequent treatment more uniform; at the same time, it adjusts the pH value of the bamboo strip surface to make it closer to neutral, which is conducive to the subsequent dyeing with natural dyes.

[0020] After this process, the wettability, flexibility and processability of bamboo strips are significantly improved, which is conducive to dye adsorption and coating adhesion. It can reduce problems such as fuzzing, breakage and uneven thickness of the filaments, improve the yield of filaments, and reduce the difficulty of weaving.

[0021] Secondly, during the dyeing process, citric acid adjusts the pH of the dye solution, facilitating the adsorption and fixation of natural dyes on bamboo fibers, resulting in more uniform dyeing. Glutinous rice paste disperses and stabilizes dye molecules, reducing localized color accumulation caused by dye agglomeration. Astragalus polysaccharides form an adsorption layer on the fiber surface, enhancing the retention and binding stability of dyes on the bamboo strips, synergistically improving color fixation with glutinous rice paste. This process addresses issues such as shallow penetration, easy color accumulation, poor color fixation, and easy fading of natural dyes, improving color uniformity and durability, while also making the fiber surface more uniform, providing a good adhesion foundation for subsequent coatings.

[0022] Thirdly, in the film-forming process, konjac gum possesses excellent adhesion and film-forming properties, ensuring a strong bond between the coating and the bamboo strips. Food-grade white beeswax enhances the coating's water resistance and abrasion resistance, while also imparting suitable flexibility. Fine rice flour fills the microscopic gaps in the coating, improving its uniformity and density. Sodium carboxymethyl cellulose enhances the coating's adhesion, flexibility, and film-forming continuity, reducing the risk of cracking and peeling. The flexible protective film formed in this process can accommodate intricate weaving operations such as bending and interlacing bamboo strips, improving upon the problems of traditional hard coatings that are prone to cracking, peeling, and scratching the bamboo strips and dye layer. It is suitable for the hand-weaving requirements of Gaoping bamboo calligraphy and painting, while further enhancing the dye's color-fixing stability, extending the finished product's shelf life, and providing good coating transparency while preserving the original texture of the bamboo strips.

[0023] In summary, the process of this invention improves the overall quality of bamboo-woven calligraphy and paintings by optimizing processes such as substrate modification, dye fixing, and coating protection, and has positive significance for the improvement and application of Gaoping bamboo weaving techniques. Detailed Implementation

[0024] The preparation methods of Astragalus polysaccharide, Artemisia argyi extract, three-proof solution, Gallnut black dye extract, and glutinous rice paste used in the following examples and comparative examples are as follows: (1) Preparation method of Astragalus polysaccharide (purity ≥98%): Take 500g of dried Astragalus root, crush it to 20 mesh, add 8 times the amount of deionized water, and extract at 60℃ for 2h. Repeat the extraction twice and combine the two extracts. After filtering through a 100-mesh filter, concentrate it to 1 / 5 of the original volume at 45℃ and -0.08MPa. Add 3 times the amount of food-grade anhydrous ethanol to the concentrate, refrigerate at 4℃ for 12h, and centrifuge at 3000r / min for 10min to collect the precipitate. Wash the precipitate twice with a small amount of food-grade anhydrous ethanol, and vacuum dry it at 45℃ and -0.08MPa to constant weight to obtain Astragalus polysaccharide powder with a purity ≥98%. Seal it in a desiccator for later use.

[0025] (2) Preparation method of Artemisia argyi extract: Take 200g of dried Artemisia argyi leaves, crush them to 30 mesh, add 5 times the amount of deionized water, boil and then simmer for 1 hour, filter and collect the filtrate through a 100 mesh filter; add 3 times the amount of deionized water to the residue, simmer for 30 minutes and then filter again, combine the two filtrates; concentrate at 40℃ and -0.08MPa under reduced pressure to 1g of dried Artemisia argyi leaves per 1mL of extract, cool to room temperature, seal and prepare for use immediately.

[0026] (3) Preparation method of three-proof liquid: Take 100g of Artemisia argyi leaves, 80g of Acorus calamus root and 50g of Phellodendron bark, grind them into 20 mesh and mix them, add 10 times the amount of deionized water, boil and then simmer for 20 minutes, filter with a 100 mesh filter, cool to room temperature, and use immediately after preparation.

[0027] Among them, mugwort leaves provide natural antibacterial components, achieving anti-mildew function and also assisting in pest control; calamus root assists in antibacterial and enhances pest control effects, and can also improve the moisture resistance of bamboo strips, achieving moisture-proof function; phellodendron bark further enhances antibacterial and anti-mildew effects. The three work synergistically to achieve the three-proof protection of anti-mildew, pest control, and moisture protection required for bamboo weaving. Existing technology uses high-temperature boiling of hydrogen peroxide for three-proof treatment, which has many defects. Its strong oxidizing properties will destroy the base modification components and natural dye glycosides, resulting in decreased bamboo strip toughness, poor dyeing effect, and corrosion of bamboo strip fibers, leaving residual oxidizing substances, affecting the quality of the finished product.

[0028] (4) Gallnut black dye extract: 100g of dried gallnut fruit is crushed to 20 mesh, 8 times the amount of deionized water is added, and it is extracted at 85℃ for 1 hour. The extract is filtered through a 100-mesh filter and the concentration of the filtrate is about 50g / L. It is then stored at room temperature.

[0029] (5) Preparation method of glutinous rice paste: Soak 100g of glutinous rice in deionized water at room temperature for 2 hours, add 500g of deionized water, simmer over low heat until the glutinous rice is soft and the paste is slightly thick, filter with a 200-mesh filter to remove residue, and prepare and use at room temperature.

[0030] (6) Rice water preparation method: Take 100g of mold-free indica rice, add 300mL of room temperature deionized water, stir at 100r / min for 30 seconds, let stand for 1 minute, pour out the turbid rice water and then filter it through a 100-mesh filter; add 300mL of room temperature deionized water to the filtered rice, stir at 200r / min for 60 seconds, let stand for 1 minute, filter through a 100-mesh filter, and the collected filtrate is rice water.

[0031] Example 1 S1. Preprocessing: S11 Bamboo Selection: Select 2-year-old Yinshan Cizhu bamboo, requiring long internodes (single node ≥ 30cm), no color spots on the bamboo body, no insect infestation, good toughness, fine fibers, and not exposed to direct sunlight; S12 Bamboo Cutting and Leaf Removal: Cut the branches and leaves along the direction of growth to avoid damaging the surface of the bamboo; S13 Cutting: Cut off the top (10cm tip) and bottom (old root section) of the bamboo, and keep the bamboo body with uniform texture in the middle. S14 Saw bamboo joint: Make a cut at the elongation node of the bamboo, 1cm away from the node, to cut the bamboo into single-section segments; S15 Removing the Green: Hold the bamboo section in your left hand, forming a triangle with your hand and the bamboo section. Press your thumb on one end of the bamboo section to fix it in place. Hold a sharp scraper in your right hand, with the scraper blade close to the bamboo surface. Scrape downwards lightly and upwards with force. The blade should not leave the bamboo surface throughout the process. Apply even force until there are no knife marks on the bamboo surface and the texture is uniform. S16 Polishing: Use the scraped fresh bamboo green to rub back and forth on the surface of the bamboo section after the green has been removed, until the bamboo surface presents a natural luster and has no roughness. S17 Cutting: Select the head of the bamboo section (smooth surface, slightly yellow inside), and use a scraper to cut out the true thickness of the bamboo to form a flat cutting surface, in preparation for subsequent segmentation. S18 Segmentation: Select a reference point on the surface of the bamboo segment. Make the first cut, forcefully piercing the bamboo wall. Using the reference point as the center, make a cut every 1cm to both sides (the second cut and subsequent cuts do not pierce the bamboo wall). The cutting trajectory should be a straight line without any curves. Determine the number of segments based on the thickness of the bamboo segment. Then, opposite the first cut, use both hands to apply even force to divide the bamboo segment into large blocks, and then divide it into equal-width bamboo blocks step by step, ensuring that the hands are in a straight line without any angle to avoid the bamboo blocks from shifting to the edges. S19 Layering: At the cut surface, place the scraper at 1 / 3 thickness of the bamboo block (thinner part with green skin) and cut horizontally. Bend the bamboo block into an S-shape with both hands to complete the first layering in one go. For the second layer, cut horizontally along the edge of the thin bamboo block separated from the first layer, strictly control the thickness of the green part, and ensure that the thickness of the bamboo block on both sides is consistent with the thickness in the middle to avoid uneven thickness. S110 Bamboo Strip Preparation: Make the first cut 1cm from the edge at the end of the bamboo block (with burrs on the surface and a slightly white interior). Use your thumb and forefinger to lift the first layer of bamboo strips. Make four more cuts in the same position. Use the ten-finger splitting method to remove the excess parts, keeping the four layers of bamboo strips of uniform thickness. Then divide the four layers into two layers, separating them one by one. Hang them in a ventilated place to air dry naturally to obtain the bamboo blanks for later use.

[0032] S2 intermediate core processing: S21 Base Composite Modification Treatment: Take bamboo strips that have been layered and naturally air-dried to a moisture content of 20-25%, and completely immerse them in the composite modification solution. Static soaking at 25℃ for 24 hours, gently turning them over once every 8 hours to ensure full contact between the bamboo strips and the modification solution. Afterward, remove the bamboo strips and gently rinse them with tap water until the surface of the bamboo strips is no longer slippery, and drain the surface water. Then, completely immerse the bamboo strips in a 0.12% (w / w) food-grade lactic acid aqueous solution and soak them at 25℃ for 3 minutes. After removing them, allow them to air-dry naturally in a ventilated environment at 25℃ and 60% relative humidity until the moisture content of the bamboo strips reaches 23%.

[0033] The preparation method of the composite modified solution is as follows: add baking soda, rice water, and kudzu root powder to deionized water, and stir at 300 r / min for 10 min until completely dissolved. The mass fractions of baking soda, rice water, and kudzu root powder are 1.0%, 25%, and 0.5%, respectively. S22 Three-proof Treatment: The modified bamboo strips are completely immersed in the plant-derived three-proof solution at 25°C for 30 minutes. Then, the three-proof solution is transferred to a stainless steel container, heated to boiling, and kept boiling for 20 minutes. The bamboo strips are then removed and rinsed repeatedly with tap water until no foam adheres to the surface and the dripping rinse water is clear and bubble-free. The bamboo strips are then air-dried in a ventilated environment at 25°C and 60% relative humidity until the moisture content of the bamboo strips is 20%.

[0034] S23 Dyeing Treatment: Add the dyeing solution to a stainless steel container and heat it to a constant temperature of 95℃. Place the bamboo strips that have undergone three-proof treatment into the container and maintain the temperature at 95℃ for 40 minutes. Gently stir the bamboo strips once every 12 minutes to ensure even dyeing. After the dyeing is completed, stop heating and allow the bamboo strips and the dyeing solution to cool naturally to 45℃. After removing the bamboo strips, air dry them in a well-ventilated environment at 25℃ and 60% relative humidity until the moisture content of the bamboo strips reaches 14%.

[0035] The preparation of the dyeing solution is as follows: using deionized water as the base liquid, add gallnut black dye extract, edible citric acid, glutinous rice paste and astragalus polysaccharide in sequence, and stir at 400 r / min for 15 min until the system is homogeneous. The mass fraction of natural plant dye is 8%, the mass fraction of edible citric acid is 0.6%, the mass fraction of glutinous rice paste is 6%, and the mass fraction of astragalus polysaccharide is 0.5%.

[0036] S24 Starch Dispersion Treatment: Using a soft-bristled wool brush (bristle density 330 bristles / cm²), lightly and evenly brush 0.06wt% food-grade sodium carboxymethyl cellulose solution (viscosity 200mPa·s) onto the surface of the dyed and air-dried bamboo strips twice. Allow the bamboo strips to air dry naturally for 35 minutes in a ventilated environment at 25℃ and 60% relative humidity.

[0037] S25 Film Forming Treatment: 900-mesh fine rice flour, food-grade sodium carboxymethyl cellulose, and natural mugwort extract are added sequentially to konjac gum solution (deionized water is heated to 48°C, konjac gum is added, and it is stirred at 300 rpm for 20 minutes until completely dissolved, then naturally cooled to 38°C to obtain konjac gum solution). Then, melted white beeswax (white beeswax is pre-melted by heating it to 60°C in a water bath and then kept at 40°C) is added and emulsified by high-speed stirring at 800 rpm for 18 minutes to obtain a composite coating liquid. Then, a thin and even coat of the composite coating liquid is applied to one side of the bamboo strip surface with a soft wool brush and placed in a ventilated environment at 33°C and 50% relative humidity for 1.8 hours to form a flexible protective film with a thickness of 5μm.

[0038] The composite coating liquid contains 2.5% konjac gum, 0.6% beeswax, 0.6% 900-mesh fine rice flour, 0.22% food-grade sodium carboxymethyl cellulose, and 0.06% natural mugwort extract.

[0039] S3 Post-processing: S31 Thinning of the bamboo strip layer: Tie a thick book with transparent tape on your knee, place a sharp scraper flat on the flat surface of the book, place the bamboo strip with the uncoated side down and the coated side up under the scraper, and pull the bamboo strip vertically downward with your left hand, scraping repeatedly 25-30 times until the bamboo strip layer is stacked up, and you can clearly see the text on the newspaper below, ensuring that the bamboo strip layer is of uniform thickness and has a fine texture; S32 filament splitting: Select 24-filament special fine needles, keep the needles perpendicular to the bamboo strips, place them on a flat table with adhesive tape, pull the bamboo strips vertically backward at a uniform speed with your left hand, and gently push the needles with your right hand to split the filaments. Avoid placing the needles at an angle or pressing them directly to prevent the bamboo strips from having pinholes or being larger at one end than the other, so as to obtain fine filaments of uniform thickness. S33 Weaving: Select a well-designed weaving blueprint, identify the pattern and stitching rules of the blueprint, and start according to the blueprint (determine the edge lines, star points and the direction of the star points). Use the traditional techniques of Gaoping bamboo weaving or traditional bamboo weaving techniques (such as plain weave, twill weave, jacquard weave) to hand-weave the strips after they have been separated, ensuring that the pattern is clear and the stitching is neat. S34 Finishing: After weaving, gently finish the surface of the bamboo woven calligraphy and painting, smooth out any raised bamboo strips, adjust the spacing of the patterns, and ensure that the overall surface is flat and beautiful; S35 Trimming: Use sharp small scissors to trim the excess bamboo strips along the edges of the calligraphy and painting, making the edges neat, without burrs or excess corners; S36 Mounting: Following traditional calligraphy and painting mounting techniques, the trimmed bamboo-woven calligraphy and painting are fixed to the mounting base, covered with a transparent protective film, and the mounting is completed, resulting in a finished black bamboo-woven calligraphy and painting.

[0040] Example 2 Compared to Example 1, the S1 pretreatment and S3 posttreatment processes are completely identical to those in Example 1, with only the process parameters of the S2 intermediate core processing part being adjusted. The specific parameter adjustments are as follows (the parts of the S2 intermediate core processing not mentioned for adjustment are identical to those in Example 1): S21 substrate composite modification treatment: baking soda 0.7% by mass, rice water 18% by mass, kudzu root powder 0.2% by mass, soaked at 20℃ for 18h; lactic acid aqueous solution 0.08% by mass; S23 dyeing treatment: 3% natural plant dye, 0.2% edible citric acid, 2% glutinous rice paste, and 0.1% astragalus polysaccharide; boil at 80℃ for 25 minutes, cool naturally to 35℃, and air dry until the moisture content is 8%. S24 starch dispersion treatment: 0.04wt% sodium carboxymethyl cellulose solution, lightly brush once with a soft wool brush, and air dry at 25℃ for 25 min; S25 film-forming treatment: 1.2% konjac gum, 0.6% beeswax, 0.2% 700-mesh rice flour, 0.08% sodium carboxymethyl cellulose, and 0.02% mugwort extract.

[0041] Example 3 Compared to Example 1, the S1 pretreatment and S3 posttreatment processes are completely identical to those in Example 1, with only the process parameters of the S2 intermediate core processing part being adjusted. The specific parameter adjustments are as follows (the parts of the S2 intermediate core processing not mentioned for adjustment are identical to those in Example 1): S21 substrate composite modification treatment: baking soda 0.9% by mass, rice water 22% by mass, kudzu root powder 0.4% by mass, soaked at 23℃ for 21h; lactic acid aqueous solution 0.10% by mass; S23 dyeing treatment: 5% natural plant dye, 0.4% edible citric acid, 4% glutinous rice paste, and 0.3% astragalus polysaccharide; boil at 88℃ for 32 minutes, cool naturally to 40℃, and air dry until the moisture content is 11%. S24 starch dispersion treatment: 0.05wt% sodium carboxymethyl cellulose solution, lightly brush twice with a soft wool brush, and air dry at 25℃ for 30 min; S25 film-forming treatment: 1.8% konjac gum, 0.9% white beeswax, 0.4% 800-mesh fine rice flour, 0.15% sodium carboxymethyl cellulose, 0.04% Artemisia argyi extract, protective film thickness 3.5μm; Comparative Example 1 Compared to Example 1, the composite modified liquid retains only baking soda (1.0% by mass) and rice water (25% by mass), removes kudzu root powder, and the remaining steps and parameters are the same as in Example 1.

[0042] Comparative Example 2 Compared to Example 1, in step S21, after soaking in the composite modified liquid and rinsing with clean water, the product is directly drained naturally until the water content is 23%, thus removing the lactic acid aqueous solution soaking step. All other steps and parameters are the same as in Example 1.

[0043] Comparative Example 3 Compared to Example 1, in step S23, the dyeing solution retains only the gallnut dye extract (8% by mass), edible citric acid (0.6% by mass), and glutinous rice paste (6% by mass), while removing astragalus polysaccharide. All other steps and parameters are the same as in Example 1.

[0044] Comparative Example 4 Compared to Example 1, step S24 starch dispersion treatment is removed. After boiling and air-drying, the process proceeds directly to the film-forming process. All other steps and parameters are the same as in Example 1.

[0045] Comparative Example 5 Compared to Example 1, when preparing the composite coating liquid, konjac gum (starch mass fraction 2.5%) was replaced with 800-mesh conventional rice starch. All other steps and parameters were the same as in Example 1.

[0046] Experimental Example This experiment used the bamboo-woven calligraphy and painting products prepared in Examples 1-3 and Comparative Examples 1-5 as the testing objects. The testing indicators included the yield of separated bamboo strips, color stability, coating compatibility, mildew resistance of the finished product, and bamboo strip flexibility. The tests were conducted according to the general testing methods used in the bamboo weaving handicraft industry. All tests were carried out in a standard environment of 25℃ and 60% relative humidity. Each group of samples was tested in triplicate, and the average value was taken as the result (as shown in Table 1). The specific test items are as follows: (1) Finished product yield of filament splitting: Take 100 bamboo strips after S2 core treatment in each example and comparative example, and split them using the same filament splitting process with 24-filament special precision needle. Count the number of qualified filament splitting without breakage, without fuzzing, and with uniform thickness. Finished product yield of filament splitting = number of qualified filament splitting / total number of bamboo strips × 100%.

[0047] (2) Color stability: ① Directly observe the color uniformity of the finished bamboo-woven calligraphy and paintings prepared in each embodiment and comparative example, and record whether there is color accumulation or color blurring; ② Abrasion resistance: Take the finished bamboo woven calligraphy and paintings prepared in each example and comparative example, and use a dry cotton cloth to gently rub the same position on the surface of the calligraphy and painting 50 times with a force of about 5N. Observe whether the cotton cloth is stained and whether the surface of the calligraphy and painting is stained. ③ Water resistance: Take the finished bamboo woven calligraphy and paintings prepared in each example and comparative example, soak them in room temperature water for 30 minutes, take them out and drain them, and observe whether the color fades or bleeds.

[0048] (3) Coating compatibility: ① Weaving adaptability: Take the coated bamboo strips after S2 core treatment from each embodiment and comparative example, and use the Gaoping bamboo weaving basic plain weave technique. Use 2cm×2cm as the weaving unit and weave 5 complete units by hand. Control the hand force evenly (about 5N) during weaving and record whether the coating cracks or peels during the weaving process. ② Bending resistance: Take the coated bamboo strips treated with S2 core from each example and comparative example, and bend them in an arc (with the midpoint of the bamboo strip as the bending center, slowly bend it to 180° at a speed of 5cm / min, align the two ends of the bamboo strip, hold for 3 seconds and then return to the original shape), repeat the bending 50 times, observe whether the coating cracks or falls off, and record the average number of bends until the bamboo strip breaks.

[0049] (4) Anti-mildew properties of finished product: Testing method: Complete bamboo-woven calligraphy and painting products prepared in each example and comparative example were placed in a constant temperature and humidity accelerated aging chamber at 25℃ and 85% relative humidity. They were taken out and observed after 12 months, and the presence of mold and fungal spots on the surface of the calligraphy and painting and between the bamboo fibers was recorded. The results showed that after 12 months of storage in a high temperature and high humidity environment, no mold or fungal spots grew in Examples 1-3 and Comparative Examples 1-5.

[0050] (5) Bamboo strip flexibility: Take 50 qualified bamboo strips obtained by splitting the core after S2 treatment in each example and comparative example, and measure the breaking elongation of each bamboo strip. The test was conducted using a universal testing machine at a tensile speed of 5 mm / min, and the average value was taken.

[0051] Table 1: As can be seen from Table 1: Examples 1-3 effectively improve the problems of low yield of bamboo woven calligraphy and painting products, insufficient color stability, poor coating compatibility, and poor bamboo strip flexibility. The yield of bamboo strips in all three cases is ≥92.3%, ensuring the quality of fine bamboo strip separation; the elongation at break of bamboo strips is ≥14.8%, and the number of bends is ≥55, improving the toughness of the bamboo strips and better adapting to the needs of fine weaving; the color stability is excellent, with no color accumulation or blurring, no staining when dry-rubbed, and no color fading when soaked in water, ensuring uniform and lasting color in the finished product; the coating compatibility is good, with no cracking or peeling during weaving, and the coating does not break after repeated bending, highly matching the needs of fine bamboo weaving in Gaoping.

[0052] In Comparative Example 1, the lack of kudzu root powder resulted in insufficient reinforcement of bamboo fiber toughness, leading to a decrease in both the yield of filament separation and the flexibility of the bamboo strips. In Comparative Example 2, the absence of a lactic acid degumming step resulted in uneven dye penetration, reduced color stability, and a certain impact on coating compatibility. In Comparative Example 3, the lack of astragalus polysaccharide prevented the dye from achieving firm color fixation, resulting in a significant decrease in color stability. In Comparative Example 4, the absence of a starch dispersion step led to localized accumulation on the coating surface, making it prone to cracking and peeling during weaving. In Comparative Example 5, the use of conventional starch instead of konjac gum resulted in the coating losing its intended flexibility, reduced bamboo strip toughness, and easy coating peeling during weaving.

Claims

1. A bamboo weaving calligraphy and painting production process, using Cizhu bamboo as raw material, including traditional bamboo selection, cutting, removing the outer green layer, layering, three-proofing, dyeing, separating fibers, weaving, and mounting processes; characterized in that, A bamboo strip substrate composite modification treatment process is added after the layering process and before the three-proof process, and a film-forming treatment process is added after the dyeing process. The specific steps of the composite modification treatment of the bamboo strip base are as follows: Take the layered bamboo strips and soak them in the composite modification solution at room temperature. After soaking, take out the bamboo strips, rinse them gently with clean water until they are no longer slippery, and then soak them in the lactic acid solution at room temperature. After taking them out, let them drain naturally. The composite modified liquid includes baking soda, rice water, and kudzu root powder; The dyeing process is as follows: After the bamboo strips have undergone the three-proof process, they are placed in the dyeing solution and boiled. After the dyeing is completed, they are cooled naturally, taken out and air-dried in the shade. The dyeing solution includes natural plant dyes, citric acid, glutinous rice paste, and astragalus polysaccharide. The film-forming process is as follows: The composite coating liquid is evenly brushed onto the surface of the dyed bamboo strips and placed in a ventilated environment to form a protective film naturally. The composite coating liquid includes konjac gum, white beeswax, fine rice flour, and sodium carboxymethyl cellulose.

2. The bamboo weaving calligraphy and painting production process according to claim 1, characterized in that, The composite modified liquid contains 0.7%–1.2% sodium bicarbonate, 18%–30% rice water, and 0.2%–0.6% kudzu root powder.

3. The bamboo weaving calligraphy and painting production process according to claim 1, characterized in that, The mass fraction of the lactic acid aqueous solution is 0.08%–0.12%.

4. The bamboo weaving calligraphy and painting production process according to claim 1, characterized in that, The boiling and dyeing solution contains 3%–8% natural plant dyes, 0.2%–0.6% citric acid, 2%–6% glutinous rice paste, and 0.1%–0.5% astragalus polysaccharide. During dyeing, the boiling temperature is 80-95℃ and the boiling time is 25-40 minutes.

5. The bamboo weaving calligraphy and painting production process according to claim 1, characterized in that, After dyeing and air-drying, the bamboo strips need to undergo starch dispersion treatment. Specifically, brush the surface of the bamboo strips lightly with a 0.04wt%-0.06wt% sodium carboxymethyl cellulose solution 1-2 times, and then air-dry them in the shade.

6. The bamboo weaving calligraphy and painting production process according to claim 1, characterized in that, In the composite coating liquid, the mass fraction of konjac gum is 1.2%–2.5%, the mass fraction of white beeswax is 0.6%–1.2%, the mass fraction of fine rice flour is 0.2%–0.6%, and the mass fraction of sodium carboxymethyl cellulose is 0.08%–0.22%.

7. The bamboo weaving calligraphy and painting production process according to claim 6, characterized in that, The composite coating liquid also includes 0.02%–0.06% by mass of Artemisia argyi extract.

8. The bamboo weaving calligraphy and painting production process according to claim 1, characterized in that, The thickness of the protective film is 2-5 μm.

9. The bamboo weaving calligraphy and painting production process according to claim 1, characterized in that, The glutinous rice paste is a thin paste made by boiling glutinous rice and water at a mass ratio of 1:(4-6) until it becomes slightly thick and then filtering it; the fine rice flour is 700-900 mesh rice flour.

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