High-strength low-basis-weight traditional mulberry bark paper and preparation method thereof

Abstract

The invention relates to the technical field of pulping and papermaking pretreatment, in particular to high-strength low-basis-weight traditional mulberry bark paper and a preparation method thereof. The preparation method of the high-strength low-basis-weight traditional mulberry bark paper comprises the following steps: pre-treating mulberry bark to obtain a mulberry bark raw material; carrying out two-stage chemical cooking; beating fibers; preparing pulp; performing papermaking; and drying and finishing. By adopting the two-stage chemical cooking, low-pulp-concentration papermaking and compound dispersant synergistic process, the physical properties of the prepared traditional mulberry bark paper are improved within the low basis weight range of 12-14 g / m < 2 >, and the folding strength is greater than or equal to 4800 times in the longitudinal direction and greater than or equal to 1600 times in the transverse direction. According to the technology, the fiber strength is reserved through mild delignification, fiber dispersion and interface combination are precisely regulated and controlled, and low-temperature drying is matched, so that the paper is light in weight and has excellent mechanical performance, and the requirements of special packaging and high-end cultural and creative fields for high-strength and low-basis-weight paper-based materials are completely met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pulp and papermaking pretreatment, and more particularly to a traditional mulberry paper with high strength and low basis weight and a preparation method thereof. BACKGROUND

[0002] As a traditional special paper, mulberry paper has a unique fiber structure and is often used in modern special packaging and high-end cultural and creative fields. Traditional alkali pulping process conditions are severe, which can easily lead to degradation of mulberry fibers, resulting in significant strength attenuation of the finished paper and difficulty in meeting the lightweight application requirements. The existing technology patent 202411554708.1 discloses a preparation method of low-basis-weight high-strength leather paper, which uses 48 hours of enzymatic hydrolysis combined with 24 hours of high-temperature strong alkali cooking to prepare low-basis-weight high-strength leather paper. The method has a long cycle, and long-time strong alkali cooking can easily lead to cellulose degradation. The existing technology patent 202111072789.8 discloses a preparation method of high-polymerization-degree pulp, which uses an ammonium oxalate degumming, alkali treatment, chlorine dioxide multi-stage delignification, and mechanical dissociation process route, which has made certain progress in improving the polymerization degree of pulp. However, this process uses chlorine dioxide bleaching, and the method only verifies 90 g / m 2 The preparation of high-basis-weight paper does not involve the low-basis-weight range. How to retain the flexibility of traditional mulberry paper while reducing the basis weight of the paper and maintaining or even improving its physical strength has become a technical problem that restricts its application in special packaging and high-end cultural and creative fields. SUMMARY

[0003] The present application provides a preparation method of a traditional mulberry paper with high strength and low basis weight to overcome the defects of the prior art.

[0004] The present application also provides a traditional mulberry paper with high strength and low basis weight.

[0005] To solve the above technical problems, the technical solutions of the present application are as follows: A preparation method of a traditional mulberry paper with high strength and low basis weight, comprising the following steps: S1, pretreatment of mulberry bark to obtain mulberry bark raw material; S2, two-stage chemical cooking: First-stage cooking: the mulberry bark raw material is loaded into a cooking pot, then cooking liquor A is injected into the cooking pot, the sodium carbonate concentration in the cooking liquor A is 5.5-6.5 g / L, the hydrogen peroxide concentration is 3.5-4.5 g / L, and the liquid ratio is 1 kg: 19-21 L; then 0.9-1.1 % sodium silicate is added; the cooking conditions are as follows: the temperature is raised to 93-97℃, the temperature is maintained for 1.5-2.5 h, then the temperature is lowered to 60-70℃, and the temperature is maintained for 4-6 h to complete the first-stage cooking; Second stage cooking: continue to add sodium carbonate, hydrogen peroxide and sodium silicate into the cooking pot, and the cooking conditions are as follows: heating to 93~97℃, keeping for 1.5~2.5 h, then cooling to 60~70℃, keeping for 4~6 h, and completing the second stage cooking; S3 fiber beating: washing the cooked mulberry bark, then beating the fibers, and then beating the pulp; S4 pulp mixing: controlling the pulp consistency to be 0.2%~0.4%, adding the compounded dispersant into the pulp, and the adding amount of the compounded dispersant is 0.2%~0.3% of the dry pulp mass; S5 papermaking: using the ultra-fine bamboo screen to make the paper by the hanging screen method; S6 drying and finishing: drying at the relative humidity of 35~46% RH and the temperature of 40~50℃, and obtaining the traditional high-strength low-basis weight mulberry paper.

[0006] Preferably, in the step S2, in the second stage cooking, the adding amount of sodium carbonate is 5.5~6.5 g per liter, and the adding amount of hydrogen peroxide is 3.5~4.5 g per liter; and the adding amount of sodium silicate is 0.9~1.1% of the dry mulberry raw material mass.

[0007] Preferably, the pretreatment includes removing the surface black skin after soaking and softening.

[0008] Preferably, the single feeding amount of the beating is 1.5~2.5 kg.

[0009] Preferably, the beating time is 4~6 minutes.

[0010] Preferably, the compounded dispersant comprises polyethylene oxide (PEO), abelmosk and guar gum.

[0011] Preferably, the mass ratio of polyethylene oxide (PEO), abelmosk and guar gum in the compounded dispersant is 1~2: 1~2: 1~2.

[0012] Preferably, the mass ratio of polyethylene oxide (PEO), abelmosk and guar gum in the compounded dispersant is 1: 1~2: 1.

[0013] Preferably, the density of the ultra-fine bamboo screen is 12~16 bamboo filaments per centimeter.

[0014] Preferably, the density of the ultra-fine bamboo screen is 14 bamboo filaments per centimeter.

[0015] Preferably, in the step S5 papermaking, the pulp consistency is 0.25~0.35%.

[0016] Preferably, in the step S6 drying and finishing, the paper drying temperature is 44~48℃.

[0017] Preferably, in the step S6 drying and finishing, the paper drying temperature is 46℃.

[0018] Preferably, in the step S6 drying and finishing, the relative humidity of the paper drying is 40~42% RH.

[0019] A high-strength low-basis-weight traditional mulberry paper is prepared by the preparation method of the application.

[0020] In the application, a sodium carbonate / hydrogen peroxide mixed two-stage cooking method is adopted. The cooking method can effectively remove impurities such as lignin, while maximizing the protection of the natural strength of the fiber and the pulp yield, avoiding excessive damage to the fiber length and strength, combining with the innovative complex dispersant and low-temperature drying method, to achieve the characteristics of high strength and low basis weight.

[0021] Compared with the prior art, the beneficial effects of the technical scheme of the application are: By adopting the two-stage chemical cooking, low pulp consistency papermaking and complex dispersant synergistic process of the application, the traditional mulberry paper prepared has a basis weight of 12~14 g / m 2 In the low basis weight range, the physical properties are improved: the folding endurance is ≥4800 times in the longitudinal direction and ≥1600 times in the transverse direction. The technology preserves fiber strength through mild delignification, precisely controls fiber dispersion and interface bonding, and cooperates with low-temperature drying, so that the paper has excellent mechanical properties while being lightweight, fully meeting the requirements of high-strength, low-basis-weight paper-based materials in special packaging and high-end cultural and creative fields. DETAILED DESCRIPTION

[0022] The application will be further described below in conjunction with specific examples, but the examples do not limit the application in any form. Unless otherwise specified, the reagents, methods and equipment used in the application are conventional reagents, methods and equipment in the technical field.

[0023] Unless otherwise specified, the reagents and materials used in the following examples are commercially available.

[0024] 27.5% hydrogen peroxide, hydrogen peroxide, mass fraction of hydrogen peroxide 27.5 wt%, Hangzhou Mingxin Hydrogen Peroxide Co., Ltd.

[0025] Sodium carbonate, S818014 anhydrous sodium carbonate, ≥99.5%, MacLean.

[0026] Magnesium sulfate, M813991 anhydrous magnesium sulfate, 99.99% metals basis.

[0027] Dispersant polyethylene oxide PEO, P697836, average molecular weight 12000.

[0028] Safflower gum, food grade, 99%, Wuhan Wanyong Science and Technology Development Co., Ltd.

[0029] Guar gum (guar bean gum), CAS No. 9000-30-0, 5000-5500 cps, 200 mesh, Shanghai Yuan Ye Biological Technology Co., Ltd.

[0030] The application will be described in detail as follows: A preparation method of a high-strength low-basis-weight traditional mulberry paper, comprising the following steps: S1, pretreatment of mulberry bark to obtain mulberry bark raw material; As a preferred embodiment, the pretreatment comprises removing the surface black bark after soaking and softening.

[0031] S2, two-stage chemical cooking: First-stage cooking: the mulberry bark raw material is loaded into a cooking pot, then cooking liquor A is injected into the cooking pot, the sodium carbonate concentration in the cooking liquor A is 5.5-6.5 g / L, the hydrogen peroxide concentration is 3.5-4.5 g / L, the liquid ratio is 1 kg: 19-21 L (kg of absolute dry mulberry bark raw material: L of cooking liquor A), and then 0.9-1.1 % sodium silicate is added (based on the mass of the absolute dry mulberry bark raw material, i.e., 10 kg of sodium silicate is added per 1 t of absolute dry mulberry bark); the cooking conditions are as follows: the temperature is raised to 93-97 ℃, the temperature is maintained for 1.5-2.5 h, then the temperature is lowered to 60-70 ℃, the temperature is maintained for 4-6 h, and the first-stage cooking is completed.

[0032] Second-stage cooking: the following agents are continuously added to the cooking pot: 5.5-6.5 g / L of sodium carbonate (based on the volume of the cooking liquor A), 3.5-4.5 g / L of hydrogen peroxide (based on the volume of the cooking liquor A), and 0.9-1.1 % of sodium silicate (based on the mass of the absolute dry mulberry bark raw material, i.e., 10 kg of sodium silicate is added per 1 t of absolute dry mulberry bark); the cooking conditions are as follows: the temperature is raised to 93-97 ℃, the temperature is maintained for 1.5-2.5 h, then the temperature is lowered to 60-70 ℃, the temperature is maintained for 4-6 h, and the second-stage cooking is completed.

[0033] S3, fiber beating: the cooked mulberry bark is washed, then fiber beating is performed, and then beating is performed.

[0034] As a preferred embodiment, the single feeding amount of the beating is 1.5-2.5 kg.

[0035] As a preferred embodiment, the beating time is 4-6 minutes.

[0036] S4, pulp preparation: the consistency of the pulp is controlled to be 0.2%-0.4%, a compounded dispersant is added to the pulp, and the addition amount of the compounded dispersant is 0.2%-0.3% of the mass of the absolute dry pulp.

[0037] As a preferred embodiment, the compounded dispersant comprises polyethylene oxide (PEO), abelmoschus esculentus gum, and guar gum.

[0038] As a preferred embodiment, the mass ratio of polyethylene oxide (PEO), abelmoschus esculentus gum and guar gum in the complex dispersant is 1~2: 1~2: 1~2.

[0039] As a preferred embodiment, the mass ratio of polyethylene oxide (PEO), abelmoschus esculentus gum and guar gum in the complex dispersant is 1: 1~2: 1.

[0040] S5 papermaking: using ultra-fine bamboo curtain for hanging curtain type papermaking.

[0041] As a preferred embodiment, the density of the ultra-fine bamboo curtain is 12~16 filaments / cm.

[0042] As a preferred embodiment, the density of the ultra-fine bamboo curtain is 14 filaments / cm.

[0043] As a preferred embodiment, in step S5 papermaking, the pulp concentration is 0.25~0.35%.

[0044] S6 drying and finishing: drying at relative humidity 35~46% RH and temperature 40~50℃ to obtain high-strength low-basis weight traditional mulberry paper.

[0045] As a preferred embodiment, in step S6 drying and finishing, the paper drying temperature is 44~48℃.

[0046] As a preferred embodiment, in step S6 drying and finishing, the paper drying temperature is 46℃.

[0047] As a preferred embodiment, in step S6 drying and finishing, the relative humidity of paper drying is 40~42% RH.

[0048] The application will be described in detail below in combination with examples and comparative examples: Example 1

[0049] S1 pretreatment of raw materials: taking one-year-old mulberry branches with a diameter of 2-3 cm, peeling the mulberry bark and drying; then soaking the dried mulberry bark until soft, then scraping off the black shell and the second layer of yellow shell, obtaining the innermost layer of fibers, cleaning to obtain mulberry raw materials.

[0050] S2 two-stage chemical cooking: First-stage cooking: Put mulberry bark raw material into a cooking pot, then inject cooking liquor A into the cooking pot, the concentration of sodium carbonate in the cooking liquor A is 6 g / L, the concentration of hydrogen peroxide is 4 g / L, the liquid ratio is 1 kg:20 L (kg of absolute dry mulberry bark raw material: L of cooking liquor A), then add 1% sodium silicate (based on the mass of the absolute dry mulberry bark, that is, 10 kg of sodium silicate is added for every 1 t of absolute dry mulberry bark); the cooking conditions are as follows: the temperature is increased to 95°C at a rate of 2°C / min, and then kept for 2 h, then the temperature is decreased to 65°C and kept for 5 h, and the first-stage cooking is completed.

[0051] Second-stage cooking: continue to add the following reagents into the cooking pot: 6 g / L of sodium carbonate (based on the volume of the cooking liquor A), 4 g / L of hydrogen peroxide (based on the volume of the cooking liquor A), and 1% sodium silicate (based on the mass of the absolute dry mulberry bark, that is, 10 kg of sodium silicate is added for every 1 t of absolute dry mulberry bark); the cooking conditions are as follows: the temperature is increased to 95°C at a rate of 2°C / min, and then kept for 2 h, then the temperature is decreased to 65°C and kept for 5 h, and the second-stage cooking is completed.

[0052] S3 Fiber beating: wash the cooked mulberry bark, and then put it into a beating and pounding machine for fiber beating, the single feeding amount is 2 kg, and the time is 5 min. Then perform beating, and the beating degree is 35°SR.

[0053] S4 Slurry preparation. Control the slurry concentration to be 0.3%. Add a compounded dispersant into the paper pulp, and the addition amount of the compounded dispersant is 0.3% of the mass of the absolute dry pulp. The compounded dispersant contains polyethylene oxide (PEO), abelmosk gum and guar gum. The mass ratio of polyethylene oxide (PEO), abelmosk gum and guar gum in the compounded dispersant is 1:1:1.

[0054] S5 Papermaking. Use superfine bamboo curtain (the density is 14 bamboo filaments / cm) for hanging curtain type papermaking. Control the pulp concentration to be 0.3% to ensure the basis weight and uniformity of the finished paper.

[0055] S6 Drying and finishing Use low-temperature drying technology, and control the paper drying temperature to be 46°C and the relative humidity to be 40% RH. Use soft pine needle brush to brush the dried paper, and obtain traditional mulberry bark paper with high strength and low basis weight.

[0056] Example 2 This example is similar to Example 1, except that in step S4 slurry preparation, the slurry concentration is 0.25%, the addition amount of the compounded dispersant is 0.3% (based on the absolute dry pulp), and the mass ratio of PEO:abelmosk gum:guar gum in the compounded dispersant is 1:1:1 (based on the absolute dry pulp).

[0057] Step S5 papermaking: the pulp concentration is 0.25%, the superfine bamboo curtain is 12 bamboo filaments / cm, and the hanging curtain type papermaking is performed.

[0058] Step S6 drying: the paper drying temperature is controlled at 44 ℃, and the relative humidity is 38 %RH.

[0059] Example 3 This example is similar to Example 1, except that in step S4 pulp preparation: the pulp consistency is 0.35 %, the amount of the compound dispersant is 0.2 % (calculated based on the absolute dry pulp), and the mass ratio of PEO: abelmoschus gel: guar gum in the compound dispersant is 1:1:1, calculated based on the absolute dry pulp).

[0060] Step S5 papermaking: the pulp consistency is 0.35 %, the super-fine bamboo screen is 16 wires / cm, and the hanging screen type papermaking is adopted.

[0061] Step S6 drying: the paper drying temperature is controlled at 48 ℃, and the relative humidity is 42 %RH.

[0062] Example 4 This example is similar to Example 1, except that in step S4 pulp preparation: the pulp consistency is 0.25 %, the amount of the compound dispersant is 0.2 % (calculated based on the absolute dry pulp), and the mass ratio of PEO: abelmoschus gel: guar gum in the compound dispersant is 1:1:1, calculated based on the absolute dry pulp).

[0063] Step S5 papermaking: the pulp consistency is 0.25 %, the super-fine bamboo screen is 14 wires / cm, and the hanging screen type papermaking is adopted.

[0064] Step S6 drying: the paper drying temperature is controlled at 40 ℃, and the relative humidity is 35 %RH.

[0065] Example 5 This example is similar to Example 1, except that in step S4 pulp preparation: the pulp consistency is 0.3 %, the amount of the compound dispersant is 0.30 % (calculated based on the absolute dry pulp), and the mass ratio of PEO: abelmoschus gel: guar gum in the compound dispersant is 1:2:1, calculated based on the absolute dry pulp).

[0066] Step S5 papermaking: the pulp consistency is 0.3 %, the super-fine bamboo screen is 14 wires / cm, and the hanging screen type papermaking is adopted.

[0067] Step S6 drying: the paper drying temperature is controlled at 50 ℃, and the relative humidity is 45 %RH.

[0068] Example 6 This example is similar to Example 1, except that in step S4 pulp preparation: the pulp consistency is 0.3 %, the amount of the compound dispersant is 0.30 % (calculated based on the absolute dry pulp), and the mass ratio of PEO: abelmoschus gel: guar gum in the compound dispersant is 1:1:2, calculated based on the absolute dry pulp).

[0069] Step S5 papermaking: the pulp consistency is 0.3 %, the super-fine bamboo screen is 14 wires / cm, and the hanging screen type papermaking is adopted.

[0070] Step S6 drying: the paper drying temperature is controlled at 50 °C, and the relative humidity is 45 %RH.

[0071] Example 7 This example is similar to Example 1, except that in step S4 pulp preparation: the pulp consistency is 0.3 %, the amount of the compound dispersant is 0.30 % (calculated based on the absolute dry pulp), and the mass ratio of PEO: abelmoschus gel: guar gum in the compound dispersant is 2:1:1, calculated based on the absolute dry pulp.

[0072] Step S5 papermaking: the pulp consistency is 0.3 %, the number of ultra-fine bamboo screen is 14 filaments / cm, the hanging screen type papermaking is adopted, and the paper basis weight is 13.5 g / m 2 .

[0073] Step S6 drying: the paper drying temperature is controlled at 50 °C, and the relative humidity is 45 %RH.

[0074] Comparative Example 1 This comparative example is similar to Example 1, except that in step S4 pulp preparation: the pulp consistency is 0.3 %, the amount of the compound dispersant is 0.10 % (calculated based on the absolute dry pulp), and the mass ratio of PEO: abelmoschus gel: guar gum in the compound dispersant is 1:1:1, calculated based on the absolute dry pulp.

[0075] Comparative Example 2 This comparative example is similar to Example 1, except that in step S4 pulp preparation: the pulp consistency is 0.5 %; Step S5 papermaking: the pulp consistency is 0.5 %.

[0076] Comparative Example 3 This comparative example is similar to Example 1, except that in step S6 drying: the paper drying temperature is controlled at 60 °C, and the relative humidity is 55 %RH.

[0077] Analysis and detection The whiteness is determined according to GB / T 7974-2013 Paper, paperboard and pulp - Determination of blue light diffuse reflectance factor D65 brightness (diffuse / vertical method, outdoor daylight conditions); GB / T 12914-2018 Determination of tensile strength of paper and paperboard - Constant rate of extension method; GB / T 465.2-2008 Paper and paperboard - Determination of tensile strength after immersion; GB / T 457-2008 Determination of folding endurance of paper and paperboard (4.98 N); and the detection results are shown in the following table: Table 1 Example and comparative example data table

[0078] Result analysis: The data of examples 1~7 show that the prepared traditional mulberry paper by the preparation method of two-stage chemical cooking, low pulp consistency (0.25%~0.35%), compound dispersant (0.2%~0.3%), and low temperature drying (40~50℃) can be stably prepared into high-performance mulberry paper with a basis weight of 12.0~14 g / m², good mechanical properties, a breaking length of 4.20~4.70 km, a wet strength of 450~495 mN, a folding endurance of ≥4812 times in longitudinal direction and ≥1603 times in transverse direction, and a whiteness of 77.2%~77.9%. In particular, the comprehensive performance of example 5 (PEO: albizia lebbeck gum: guar gum = 1:2:1) is optimal, with a breaking length of 4.70 km and a folding endurance of 5331 / 1758 times in longitudinal / transverse directions.

[0079] In comparative example 1, the dispersant dosage is reduced to 0.1%, and the breaking length is reduced to 3.83 km, and the folding endurance in longitudinal / transverse directions is sharply reduced to 4010 / 1423 times. In comparative example 2, 0.5% high pulp consistency is used for papermaking, and although the fiber retention rate is improved, the breaking length (4.85 km) and the folding endurance (5531 / 1826 times) are improved, but the basis weight is increased to 15.6 g / m 2 The lightweight advantage is lost.

[0080] In comparative example 3, the drying temperature is higher than the technical solution of the present application, and the brittleness of the paper is significantly increased, and the folding endurance in longitudinal / transverse directions is sharply reduced to 3877 / 1252 times.

[0081] Obviously, the above examples of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and impossible to exhaust all the embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principles of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A method for preparing traditional mulberry bark paper with high strength and low basis weight, characterized in that, Includes the following steps: S1 Mulberry bark pretreatment to obtain mulberry bark raw material; S2 Two-Stage Chemical Cooking: First stage of cooking: The mulberry bark raw material is loaded into a cooking pot, and then cooking liquid A is poured into the cooking pot. The concentration of sodium carbonate in cooking liquid A is 5.5~6.5 g / L, the concentration of hydrogen peroxide is 3.5~4.5 g / L, the liquid ratio is 1 kg : 19~21 L, and 0.9~1.1% sodium silicate is added. The cooking conditions are: heat up to 93~97℃, keep at this temperature for 1.5~2.5 h, then cool down to 60~70℃ and keep at this temperature for 4~6 h to complete the first stage of cooking. Second stage of cooking: Add sodium carbonate, hydrogen peroxide and sodium silicate to the cooking pot. Cooking conditions are: heat up to 93~97℃, keep warm for 1.5~2.5 h, then cool down to 60~70℃ and keep warm for 4~6 h to complete the second stage of cooking. S3 Fiber Decomposition: Wash the steamed mulberry bark, then decompose the fibers, and then pulp it; S4 pulp preparation: Control the pulp consistency to 0.2%~0.4%, add a compound dispersant to the pulp, and the amount of compound dispersant added is 0.2%~0.3% of the oven-dry pulp mass; S5 papermaking: using ultra-fine bamboo screens for hanging screen papermaking; S6 Drying and Finishing: Drying at a relative humidity of 35~46% RH and a temperature of 40~50℃ yields high-strength, low-basis-weight traditional mulberry bark paper.

2. The method for preparing high-strength, low-basis-weight traditional mulberry bark paper according to claim 1, characterized in that, In step S2, during the second stage of cooking, 5.5-6.5 g of sodium carbonate and 3.5-4.5 g of hydrogen peroxide are added per liter of cooking liquid A by volume; the amount of sodium silicate added is 0.9-1.1% of the mass of the oven-dried mulberry bark raw material in step S2.

3. The method for preparing high-strength, low-basis-weight traditional mulberry bark paper according to claim 1, characterized in that, The compound dispersant comprises polyethylene oxide (PEO), okra gum, and guar gum.

4. The method for preparing high-strength, low-basis-weight traditional mulberry bark paper according to claim 3, characterized in that, The mass ratio of polyethylene oxide (PEO), okra gum, and guar gum in the compound dispersant is 1~2: 1~2: 1~2.

5. The method for preparing high-strength, low-basis-weight traditional mulberry bark paper according to claim 3, characterized in that, The mass ratio of polyethylene oxide (PEO), okra gum, and guar gum in the compound dispersant is 1:1 to 2:

1.

6. The method for preparing high-strength, low-basis-weight traditional mulberry bark paper according to claim 1, characterized in that, The density of the ultrafine bamboo curtain is 12-16 bamboo strips / cm.

7. The method for preparing high-strength, low-basis-weight traditional mulberry bark paper according to claim 1, characterized in that, In step S5, during papermaking, the pulp concentration is 0.25~0.35%.

8. The method for preparing high-strength, low-basis-weight traditional mulberry bark paper according to claim 1, characterized in that, In step S6, during drying and finishing, the paper drying temperature is 44~48℃.

9. The method for preparing high-strength, low-basis-weight traditional mulberry bark paper according to claim 1, characterized in that, In step S6, during drying and finishing, the relative humidity of the paper is 40-42% RH.

10. A traditional mulberry bark paper with high strength and low basis weight, characterized in that, It is prepared according to any one of claims 1 to 9.

Images