Tibetan paper manufacturing method for student exercise book

Abstract

The invention discloses a manufacturing method of Tibetan paper for student exercise books, and relates to the field of Tibetan paper. Comprising the following steps: pretreatment of raw materials: stellera chamaejasme bast is soaked in plant ash liquid to be cooked, and then ozone bleaching is adopted; composite pulping: respectively pulping stellera chamaejasme bast fibers, bamboo pulp fibers and waste workbook recycled fibers, and then mixing; adding an auxiliary agent, namely adding the auxiliary agent into the mixed slurry; papermaking, namely diluting the pulp, forming on a net, dehydrating, squeezing, carrying out gradient drying, and finally, carrying out surface sizing; and post-treatment: carrying out calendaring treatment and slitting treatment on the glued raw materials. According to the method, the whiteness is improved through ozone bleaching, the ink absorption speed is increased through 5% hydroxyethyl starch surface sizing, meanwhile, gradient drying and calendaring are adopted, the wear resistance is improved, in addition, constant-pressure squeezing control is adopted, the thickness deviation is reduced, meanwhile, recycled fibers are adopted for replacement, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of Tibetan paper, and in particular to a method for making Tibetan paper for student exercise books. Background Art

[0002] Tibetan paper, invented in the mid-7th century AD, is a uniquely Tibetan cultural product. After Princess Wencheng brought papermaking to Tibet, Tibetan and Han Chinese artisans, lacking the bamboo, rice, and fishing nets used in Central China, worked tirelessly for years to develop a uniquely crafted paper. Because the grass itself is toxic, Tibetan paper endures for years, resisting insects, rats, rotting, or discoloration. Its tough texture makes it durable, tear-resistant, fold-resistant, and abrasion-resistant. Consequently, it became widely used for writing and printing religious texts and official government documents.

[0003] Traditional Tibetan papermaking mainly uses the bast fiber of Stellera chamaejasme as raw material. The process includes core steps such as steaming and degumming with wood ash and alkali solution, sun bleaching, and manual papermaking.

[0004] In the prior art, the manufacturing process of Tibetan paper has the following defects:

[0005] Functional defects:

[0006] The whiteness of traditional sunlight-bleached Tibetan paper is ≤65% ISO (appears yellowish to the naked eye), which can easily cause visual fatigue when writing on it for a long time.

[0007] The surface porosity of pure wolfsbane fiber paper is greater than 35% (SEM test data), resulting in an ink absorption speed of greater than 15 seconds (national standard A grade requires ≤7 seconds).

[0008] Mechanical defects:

[0009] Handmade papermaking results in uneven thickness (deviation ±0.02mm), and a high breakage rate during industrial pressing;

[0010] The abrasion resistance of paper without surface treatment is only 1500 times (ASTM D5264 test), which cannot withstand repeated wiping with an eraser.

[0011] Economic disadvantages:

[0012] When the proportion of wolfsbane raw materials is greater than 90%, the cost of a ton of paper is as high as 1,200 (wood pulp paper is only 600), and the raw material growth cycle is long.

[0013] To this end, the present invention proposes a method for making Tibetan paper for student exercise books Summary of the Invention

[0014] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a method for making Tibetan paper for student exercise books.

[0015] In order to achieve the above object, the present invention adopts the following technical solutions:

[0016] A method for making Tibetan paper for student exercise books, wherein the raw materials used are composed of the following components in a mass ratio: 40-50 parts of Stellera chamaejasme bast fiber, 30-35 parts of bamboo pulp fiber, 15-20 parts of recycled fiber from discarded exercise books, and 5 parts of a functional additive;

[0017] The production method comprises the following steps:

[0018] S1: Raw material pretreatment: soak the bast bark of Stellera chamaejasme in wood ash solution and cook it, then bleach it with ozone;

[0019] S2: composite beating, beating the Daphne chamaejasme bast fiber, bamboo pulp fiber, and waste exercise book recycled fiber separately and then mixing them;

[0020] S3: Adding additives: adding additives to the mixed slurry;

[0021] S4: Papermaking, the slurry is diluted and put on the net to form, then dehydrated and pressed, and then gradient dried, and finally surface sizing is performed;

[0022] S5: Post-processing, calendering and slitting the raw materials after sizing.

[0023] Preferably: in step S1, the mass fraction of the wood ash liquid is 5%, the temperature is 70±2° C., and the cooking time is 100-120 minutes.

[0024] Preferably, in step S1, the volume ratio of the bast bark of Stellera chamaejasme to the wood ash liquid is 1:10-15.

[0025] Preferably: in the step S2:

[0026] Stellera chamaejasme bast fiber: beating degree 35°SR, wet weight 8g;

[0027] Bamboo pulp fiber beating degree 28°SR, wet weight 12g;

[0028] The fiber recovered from the waste notebook has a beating degree of 40°SR and a wet weight of 6g.

[0029] Preferably, in the step S2, the slurry is mixed and stirred at a speed of 300-500 rpm for 30-40 minutes.

[0030] Preferably, in step S3, the auxiliary agent is composed of the following components in the following mass ratios: 0.5-1 part of PAE wet strength agent, 0.3-0.7 part of AKD sizing agent, and 1-1.5 parts of modified starch.

[0031] Preferably: in the step S4, the concentration of the net is 0.1%-0.2%, and the pressing line pressure is 60-70 kN / m.

[0032] Preferably: in the step S4, the surface sizing medium is a 5% hydroxyethyl starch solution, and the coating amount is 1.2 g / m 2 .

[0033] Preferably, in step S4, the drying is divided into three stages, which are:

[0034] Stage 1: 3-5 minutes at 100-110 degrees Celsius;

[0035] Stage 2: 2-3 minutes at 110-120 degrees Celsius;

[0036] Stage 3: 90-100 degrees Celsius for 3-5 minutes.

[0037] Preferably, in step S5, the linear pressure of the calendering treatment is 110-130 N / mm, and the temperature is 70-90 degrees Celsius.

[0038] The beneficial effects of the present invention are:

[0039] 1. The present invention improves whiteness through ozone bleaching, increases ink absorption speed through 5% hydroxyethyl starch surface sizing, and adopts gradient drying and calendering to improve wear resistance. In addition, constant pressure pressing control is adopted to reduce thickness deviation. At the same time, recycled fiber is used as a substitute to reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a flow chart of a method for making Tibetan paper for student exercise books proposed by the present invention. DETAILED DESCRIPTION

[0041] The technical solution of the present invention will be further described in detail below in conjunction with specific implementation methods.

[0042] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," and "disposed" should be understood in a broad sense. For example, they may refer to fixed connection or disposition, detachable connection or disposition, or integral connection or disposition. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0043] Example 1:

[0044] A method for making Tibetan paper for student exercise books, wherein the raw materials used are composed of the following components in a mass ratio: 40 parts of Stellera chamaejasme bast fiber, 30 parts of bamboo pulp fiber, 15 parts of recycled fiber from discarded exercise books, and 5 parts of a functional additive;

[0045] The production method comprises the following steps:

[0046] S1: Raw material pretreatment: soak the bast bark of Stellera chamaejasme in wood ash solution and cook it, then bleach it with ozone;

[0047] S2: composite beating, beating the Daphne chamaejasme bast fiber, bamboo pulp fiber, and waste exercise book recycled fiber separately and then mixing them;

[0048] S3: Adding additives: adding additives to the mixed slurry;

[0049] S4: Papermaking, the slurry is diluted and put on the net to form, then dehydrated and pressed, and then gradient dried, and finally surface sizing is performed;

[0050] S5: Post-processing, calendering and slitting the raw materials after sizing.

[0051] Example 2:

[0052] A method for making Tibetan paper for student exercise books, wherein the raw materials used are composed of the following components in a mass ratio: 45 parts of Stellera chamaejasme bast fiber, 32.5 parts of bamboo pulp fiber, 17.5 parts of recycled fiber from discarded exercise books, and 5 parts of a functional additive;

[0053] The production method comprises the following steps:

[0054] S1: Raw material pretreatment: soak the bast bark of Stellera chamaejasme in wood ash solution and cook it, then bleach it with ozone;

[0055] S2: composite beating, beating the Daphne chamaejasme bast fiber, bamboo pulp fiber, and waste exercise book recycled fiber separately and then mixing them;

[0056] S3: Adding additives: adding additives to the mixed slurry;

[0057] S4: Papermaking, the slurry is diluted and put on the net to form, then dehydrated and pressed, and then gradient dried, and finally surface sizing is performed;

[0058] S5: Post-processing, calendering and slitting the raw materials after sizing.

[0059] Example 3:

[0060] A method for making Tibetan paper for student exercise books, wherein the raw materials used are composed of the following components in a mass ratio: 50 parts of Stellera chamaejasme bast fiber, 35 parts of bamboo pulp fiber, 20 parts of recycled fiber from discarded exercise books, and 5 parts of a functional additive;

[0061] The production method comprises the following steps:

[0062] S1: Raw material pretreatment: soak the bast bark of Stellera chamaejasme in wood ash solution and cook it, then bleach it with ozone;

[0063] S2: composite beating, beating the Daphne chamaejasme bast fiber, bamboo pulp fiber, and waste exercise book recycled fiber separately and then mixing them;

[0064] S3: Adding additives: adding additives to the mixed slurry;

[0065] S4: Papermaking, the slurry is diluted and put on the net to form, then dehydrated and pressed, and then gradient dried, and finally surface sizing is performed;

[0066] S5: Post-processing, calendering and slitting the raw materials after sizing.

[0067] Example 4:

[0068] A method for making Tibetan paper for student exercise books, wherein the raw materials used are composed of the following components in a mass ratio: 45 parts of Stellera chamaejasme bast fiber, 32.5 parts of bamboo pulp fiber, 17.5 parts of recycled fiber from discarded exercise books, and 5 parts of a functional additive;

[0069] The production method comprises the following steps:

[0070] S1: Raw material pretreatment: soak the bast bark of Stellera chamaejasme in wood ash solution and cook it, then bleach it with ozone;

[0071] S2: composite beating, beating the Daphne chamaejasme bast fiber, bamboo pulp fiber, and waste exercise book recycled fiber separately and then mixing them;

[0072] S3: Adding additives: adding additives to the mixed slurry;

[0073] S4: Papermaking, the slurry is diluted and put on the net to form, then dehydrated and pressed, and then gradient dried, and finally surface sizing is performed;

[0074] S5: Post-processing, calendering and slitting the raw materials after sizing.

[0075] In step S1, the mass fraction of the wood ash liquid is 5%, the temperature is 68° C., and the cooking time is 100 minutes.

[0076] In the step S1, the volume ratio of the Stellera chamaejasme bast to the wood ash liquid is 1:10.

[0077] In the S2 step:

[0078] Stellera chamaejasme bast fiber: beating degree 35°SR, wet weight 8g;

[0079] Bamboo pulp fiber beating degree 28°SR, wet weight 12g;

[0080] The fiber recovered from the waste notebook has a beating degree of 40°SR and a wet weight of 6g.

[0081] In the step S2, the slurry was mixed and stirred at a rotation speed of 300 rpm for 30 minutes.

[0082] In the step S3, the auxiliary agent is composed of the following components in the following mass ratios: 0.5 parts of PAE wet strength agent, 0.3 parts of AKD sizing agent, and 1 part of modified starch.

[0083] In the step S4, the online concentration is 0.1% and the pressing line pressure is 60 kN / m.

[0084] In the step S4, the surface sizing medium is a 5% hydroxyethyl starch solution, and the coating amount is 1.2 g / m 2 .

[0085] In the step S4, the drying is divided into three stages, which are:

[0086] Stage 1: 3 minutes at 100 degrees Celsius;

[0087] Stage 2: 2 minutes at 110 degrees Celsius;

[0088] Stage 3: 3 minutes at 90 degrees Celsius.

[0089] In the step S5, the linear pressure of the calendering treatment is 110 N / mm and the temperature is 70 degrees Celsius.

[0090] Example 5:

[0091] A method for making Tibetan paper for student exercise books, wherein the raw materials used are composed of the following components in a mass ratio: 45 parts of Stellera chamaejasme bast fiber, 32.5 parts of bamboo pulp fiber, 17.5 parts of recycled fiber from discarded exercise books, and 5 parts of a functional additive;

[0092] The production method comprises the following steps:

[0093] S1: Raw material pretreatment: soak the bast bark of Stellera chamaejasme in wood ash solution and cook it, then bleach it with ozone;

[0094] S2: composite beating, beating the Daphne chamaejasme bast fiber, bamboo pulp fiber, and waste exercise book recycled fiber separately and then mixing them;

[0095] S3: Adding additives: adding additives to the mixed slurry;

[0096] S4: Papermaking, the slurry is diluted and put on the net to form, then dehydrated and pressed, and then gradient dried, and finally surface sizing is performed;

[0097] S5: Post-processing, calendering and slitting the raw materials after sizing.

[0098] In step S1, the mass fraction of the wood ash liquid is 5%, the temperature is 701° C., and the cooking time is 110 minutes.

[0099] In the step S1, the volume ratio of the Stellera chamaejasme bast to the wood ash liquid is 1:12.5.

[0100] In the S2 step:

[0101] Stellera chamaejasme bast fiber: beating degree 35°SR, wet weight 8g;

[0102] Bamboo pulp fiber beating degree 28°SR, wet weight 12g;

[0103] The fiber recovered from the waste notebook has a beating degree of 40°SR and a wet weight of 6g.

[0104] In the step S2, the slurry was mixed and stirred at a rotation speed of 400 rpm for 35 minutes.

[0105] In the step S3, the auxiliary agent is composed of the following components in the following mass ratios: 0.75 parts of PAE wet strength agent, 0.5 parts of AKD sizing agent, and 1.25 parts of modified starch.

[0106] In the step S4, the screen concentration is 0.15% and the pressing line pressure is 65 kN / m.

[0107] In the step S4, the surface sizing medium is a 5% hydroxyethyl starch solution, and the coating amount is 1.2 g / m 2 .

[0108] In the step S4, the drying is divided into three stages, which are:

[0109] Stage 1: 4 minutes at 105 degrees Celsius;

[0110] Stage 2: 2.5 minutes at 115 degrees Celsius;

[0111] Stage 3: 4 minutes at 95 degrees Celsius.

[0112] In the step S5, the linear pressure of the calendering treatment is 120 N / mm and the temperature is 80 degrees Celsius.

[0113] Example 6:

[0114] A method for making Tibetan paper for student exercise books, wherein the raw materials used are composed of the following components in a mass ratio: 45 parts of Stellera chamaejasme bast fiber, 32.5 parts of bamboo pulp fiber, 17.5 parts of recycled fiber from discarded exercise books, and 5 parts of a functional additive;

[0115] The production method comprises the following steps:

[0116] S1: Raw material pretreatment: soak the bast bark of Stellera chamaejasme in wood ash solution and cook it, then bleach it with ozone;

[0117] S2: composite beating, beating the Daphne chamaejasme bast fiber, bamboo pulp fiber, and waste exercise book recycled fiber separately and then mixing them;

[0118] S3: Adding additives: adding additives to the mixed slurry;

[0119] S4: Papermaking, the slurry is diluted and put on the net to form, then dehydrated and pressed, and then gradient dried, and finally surface sizing is performed;

[0120] S5: Post-processing, calendering and slitting the raw materials after sizing.

[0121] In the step S1, the mass fraction of the wood ash liquid is 5%, the temperature is 72° C., and the cooking time is 120 minutes.

[0122] In the step S1, the volume ratio of the Stellera chamaejasme bast to the wood ash liquid is 1:15.

[0123] In the S2 step:

[0124] Stellera chamaejasme bast fiber: beating degree 35°SR, wet weight 8g;

[0125] Bamboo pulp fiber beating degree 28°SR, wet weight 12g;

[0126] The fiber recovered from the waste notebook has a beating degree of 40°SR and a wet weight of 6g.

[0127] In the step S2, the slurry was mixed and stirred at a rotation speed of 500 rpm for 40 minutes.

[0128] In the step S3, the auxiliary agent is composed of the following components in the following mass ratios: 1 part of PAE wet strength agent, 0.7 part of AKD sizing agent, and 1.5 parts of modified starch.

[0129] In the step S4, the screen concentration is 0.2% and the pressing line pressure is 70 kN / m.

[0130] In the step S4, the surface sizing medium is a 5% hydroxyethyl starch solution, and the coating amount is 1.2 g / m 2 .

[0131] In the step S4, the drying is divided into three stages, which are:

[0132] Stage 1: 5 minutes at 110 degrees Celsius;

[0133] Stage 2: 3 minutes at 120 degrees Celsius;

[0134] Stage 3: 5 minutes at 100 degrees Celsius.

[0135] In the step S5, the linear pressure of the calendering treatment is 130 N / mm and the temperature is 90 degrees Celsius.

[0136] The invention improves whiteness through ozone bleaching, increases ink absorption speed through 5% hydroxyethyl starch surface sizing, and simultaneously adopts gradient drying and calendering to increase wear resistance. In addition, constant pressure pressing control is adopted to reduce thickness deviation, and recycled fiber is used as a substitute to reduce cost.

[0137] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A method for making Tibetan paper for student exercise books, characterized in that: The raw materials used are composed of the following components in mass ratio: 40-50 parts of Stellera chamaejasme bast fiber, 30-35 parts of bamboo pulp fiber, 15-20 parts of recycled fiber from discarded exercise books, and 5 parts of functional additives; The production method comprises the following steps: S1: Raw material pretreatment: soak the bast bark of Stellera chamaejasme in wood ash solution and cook it, then bleach it with ozone; S2: composite beating, beating the Daphne chamaejasme bast fiber, bamboo pulp fiber, and waste exercise book recycled fiber separately and then mixing them; S3: Adding additives: adding additives to the mixed slurry; S4: Papermaking, the slurry is diluted and put on the net to form, then dehydrated and pressed, and then gradient dried, and finally surface sizing is performed; S5: Post-processing, calendering and slitting the raw materials after sizing.

2. The method for making Tibetan paper for student workbooks according to claim 1, characterized in that: In the step S1, the mass fraction of the wood ash liquid is 5%, the temperature is 70±2° C., and the cooking time is 100-120 minutes.

3. The method for making Tibetan paper for student workbooks according to claim 2, characterized in that: In the step S1, the volume ratio of the bast bark of Stellera chamaejasme to the wood ash liquid is 1:10-15.

4. The method for making Tibetan paper for student workbooks according to claim 1, characterized in that: In the S2 step: Stellera chamaejasme bast fiber: beating degree 35°SR, wet weight 8g; Bamboo pulp fiber beating degree 28°SR, wet weight 12g; The fiber recovered from the waste notebook has a beating degree of 40°SR and a wet weight of 6g.

5. The method for making Tibetan paper for student workbooks according to claim 4, characterized in that: In the step S2, the slurry is mixed and stirred at a speed of 300-500 rpm for 30-40 minutes.

6. The method for making Tibetan paper for student workbooks according to claim 1, characterized in that: In the step S3, the auxiliary agent is composed of the following components in the following mass ratios: 0.5-1 part of PAE wet strength agent, 0.3-0.7 part of AKD sizing agent, and 1-1.5 parts of modified starch.

7. The method for making Tibetan paper for student workbooks according to claim 1, characterized in that: In the step S4, the concentration of the net is 0.1%-0.2%, and the pressing line pressure is 60-70 kN / m.

8. The method for making Tibetan paper for student workbooks according to claim 7, characterized in that: In the step S4, the surface sizing medium is a 5% hydroxyethyl starch solution, and the coating amount is 1.2 g / m 2 .

9. The method for making Tibetan paper for student workbooks according to claim 8, characterized in that: In the step S4, the drying is divided into three stages, which are: Stage 1: 3-5 minutes at 100-110 degrees Celsius; Stage 2: 2-3 minutes at 110-120 degrees Celsius; Stage 3: 90-100 degrees Celsius for 3-5 minutes.

10. The method for making Tibetan paper for student workbooks according to claim 1, characterized in that: In the step S5, the linear pressure of the calendering treatment is 110-130 N / mm and the temperature is 70-90 degrees Celsius.

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