A thin paper for ink writing with quick drying property and its manufacturing method

Abstract

The present invention discloses a notebook paper with quick-drying ink writing and its manufacturing method. This method uses a mixed pulp of sulfate chemical softwood pulp and sulfate chemical hardwood pulp, and controls the beating degree of the mixed pulp at 20 - 35°SR. Through screening, sizing, dewatering and forming in the wire section, pressing, pre-drying, surface sizing, post-drying, and calendering, a notebook paper with quick-drying ink writing is made. In the sizing process, glyoxal polyamide resin is added, and the surface sizing is carried out using a zirconium-cationic polyvinyl alcohol copolymer compounded with starch. By adding glyoxal polyamide resin in the pulp, the present invention expands the fiber network structure of the paper sheet and improves the ink absorbency of the paper. At the same time, by using the method of surface sizing with a zirconium-cationic polyvinyl alcohol copolymer compounded with starch, the influence of the starch coating on the drying of the ink is reduced. This technology of the present invention can make the notebook paper have the ink dry quickly during writing, effectively prevent smudging, and at the same time ensure that the paper has good sizing performance, does not bleed ink, and does not dissolve in water.

Description

Technical Field

[0001] The present invention belongs to the technical field of papermaking processes, and particularly relates to a fast-drying technology for ink writing on notebook paper, including notebook paper with fast-drying ink writing and its manufacturing method. Background Art

[0002] Writing paper is a large-consumption cultural paper, suitable for forms, exercise books, account books, record books, etc., for writing, and the basis weight can be 45 g / m² to 80 g / m². Generally quality requirements include: white color, smooth on both sides, tight texture, and no bleeding when writing; generally made from bleached chemical pulp as raw material and manufactured by paper machines such as fourdrinier machines or cylinder machines.

[0003] With the improvement of the national living standard in our country, people's requirements for the writing experience of notebook paper are also getting higher and higher. In the notebook paper market, rapid drying of ink after writing and no smudging are extremely important characteristics, but there are no domestic high-end notebook paper products that can achieve fast-drying ink. Due to the lack of fast-drying technology for notebook paper ink in the country, domestic stationery manufacturers have been suffering from the difficulty of finding satisfactory fast-drying ink papers and are difficult to meet the requirements of top-notch notebooks. Summary of the Invention

[0004] In view of the above problems, the present invention provides a notebook paper with fast-drying ink writing and its manufacturing method. The notebook paper provided by the present invention can make the ink marks dry quickly when writing with gel pens, water-based pens, and oil-based pens, effectively prevent smudging, and at the same time ensure that the paper has good sizing performance, no ink bleeding, and no water softening.

[0005] The present invention provides a manufacturing method of a notebook paper with fast-drying ink writing, which includes the following steps:

[0006] Mix and pulp sulfate softwood chemical pulp and sulfate hardwood chemical pulp, and control the beating degree of the mixed pulp at 20 - 35°SR; through screening, sizing, dewatering and forming in the wire section, pressing, pre-drying, surface sizing, post-drying, and calendering, a notebook paper with fast-drying ink writing is made;

[0007] Among them, glyoxal polyamide resin is added during the sizing process, and the surface sizing is carried out using a zirconium-cationic polyvinyl alcohol copolymer compounded with starch.

[0008] In an embodiment of the present invention, the weight percentage of the sulfate softwood chemical pulp and sulfate hardwood chemical pulp in the mixed pulp is 10 - 30%: 70 - 90%.

[0009] In an embodiment of the present invention, the beating degree of the mixed pulp is controlled at 25 - 32°SR.

[0010] In an embodiment of the present invention, precipitated silica is further added during the sizing process. The addition point is the inlet of the paper machine screen, and the dosage is 2 - 8 kg per ton of paper.

[0011] In an embodiment of the present invention, the glyoxal polyamide resin added during the sizing process is added at the outlet of the paper machine screen, and the dosage is 0.2 - 1.2 kg per ton of paper.

[0012] In an embodiment of the present invention, the dosage of the zirconium - cationic polyvinyl alcohol copolymer for surface sizing is 0.5 - 2.0 kg per ton of paper.

[0013] In an embodiment of the present invention, the dosage of the glyoxal polyamide resin in the sizing process is 0.3 - 1.0 kg per ton of paper; the dosage of the zirconium - cationic polyvinyl alcohol copolymer for surface sizing is 0.5 - 1.5 kg per ton of paper.

[0014] In an embodiment of the present invention, the precipitated silica added during the sizing process is 400 mesh; the surface sizing is carried out by means of film transfer.

[0015] The present invention provides notepad paper obtained by the manufacturing method as described above. The basis weight of the paper is 50 - 100 g / m 2 。

[0016] In an embodiment of the present invention, the notepad paper satisfies the requirements of quick drying for water - based ink, oil - based ink, and neutral ink, and the sizing degree of the paper is 2.0 mm.

[0017] When writing on paper, the drying of the ink is achieved by the migration of the ink solvent into the paper sheet and by the evaporation of the ink solvent. For paper, the key is to achieve quick drying during writing (abbreviated as quick drying during writing or quick drying of ink) by improving the absorption performance of the paper for the solvent components in the ink. If quick drying of the ink is achieved only by reducing the sizing performance of the paper and the water - resistance performance of the paper, it will lead to problems such as easy water - separation and bleeding of the ink after writing. Therefore, quick drying of the ink and bleeding of the ink are a contradiction, which makes quick drying during writing of notepad paper a major technical bottleneck in the international and domestic paper - making industries. Currently, the inks used for writing internationally and domestically mainly include three types, namely water - based ink, oil - based ink, and neutral ink (a mixture of water - based and oil - based). Therefore, to achieve quick drying of the ink, the quick drying of these three types of inks must be satisfied. In addition, quick drying of the ink must be achieved on the premise of ensuring that the paper has excellent anti - bleeding and anti - water - separation properties.

[0018] Compared with the prior art, the embodiments of the present invention involve the research and development of a fast-drying technology for writing with ink on notebook paper. This technical method is applicable to the paper machines for producing traditional cultural paper. The basic process of such paper machines is as follows: pulping, sizing, diluting seasonings, pulp pumping, sand removal, screening, dewatering and forming on the wire section, pressing, pre-drying, surface sizing, post-drying, calendering, winding, and packing. The present invention adds glyoxal polyamide resin in the pulp to expand the fiber network structure of the paper sheet and improve the ink absorbency of the paper. At the same time, a method of surface sizing with a zirconium-cationic polyvinyl alcohol copolymer compounded with starch is adopted to reduce the influence of the starch coating on the drying of the ink. In addition, for the raw materials of the papermaking pulp, the beating degree of the mixed pulp is controlled at 20-35°SR to improve the air permeability of the paper, enhance the ink absorbency, and improve the ink drying effect. This technology of the present invention can enable the notebook paper to dry the ink quickly when writing with neutral pens, water-based pens, and oil-based pens, effectively prevent smudging, and at the same time, this technology ensures that the paper has good sizing performance, does not bleed ink, and does not dissolve in water. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a diagram of the test results of the ink drying comparison of the high-end notebook paper manufactured in Example 3 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below in conjunction with specific embodiments. The description of this part is only exemplary and explanatory, and should not have any restrictive effect on the protection scope of the present invention.

[0021] The present invention provides a method for manufacturing a notebook paper with fast-drying ink writing, including the following steps:

[0022] Using sulfate chemical softwood pulp and sulfate chemical hardwood pulp for combined papermaking, and controlling the beating degree of the mixed pulp at 20-35°SR; through screening, sizing, dewatering and forming on the wire section, pressing, pre-drying, surface sizing, post-drying, and calendering, a notebook paper with fast-drying ink writing is made;

[0023] Among them, glyoxal polyamide resin is added in the sizing process, and the surface sizing is carried out with a zirconium-cationic polyvinyl alcohol copolymer compounded with starch.

[0024] The notebook paper manufactured by the present invention has the characteristics of fast-drying ink writing, can effectively prevent the ink written from being smudged, and can ensure that the paper has good sizing performance, does not bleed ink, and does not dissolve in water, thus solving the key problems of domestic notebook paper products.

[0025] In the production of notebook paper, a certain proportion of long-fiber chemical pulp is generally used. In the embodiment of the present invention, kraft chemical softwood pulp (NBKP) and kraft chemical hardwood pulp (LBKP) are used for co-papermaking, and the weight percentages of the two can be 10-30%: 70-90%. It is only necessary to use the commonly used kraft chemical pulp in the art as the raw material for papermaking pulp. The average fiber length of the kraft chemical softwood pulp is 2.0-3.0 mm, and the average fiber length of the kraft chemical hardwood pulp is 0.6-1.0 mm.

[0026] In the embodiment of the present invention, the above-mentioned papermaking pulp raw materials are beaten and mixed. The beating degree of the mixed pulp is controlled at 20-35°SR, preferably 25-32°SR, to further improve the ink drying effect. The beating degree, also known as the "refining degree", is expressed in °SR and is an index to measure the difficulty of dewatering the paper stock.

[0027] In the embodiment of the present invention, the mixed pulp can be adjusted to a mass concentration of 3.2%-3.5%. After the pulp is mixed in the embodiment of the present invention, it is subjected to thick pulp screening, then dilution, sand and gas removal, sizing, and fine screening; glyoxal polyamide resin is added during the sizing process. In the present invention, the glyoxal polyamide resin added in the pulp bridges between fibers to form a three-dimensional network structure. This structure has high stiffness and is not easily deformed, effectively improving the porosity and air permeability of the paper, thereby improving the ink absorption of the paper and further improving the drying speed when writing with ink.

[0028] In the embodiment of the present invention, the glyoxal polyamide resin added during the sizing process is added at the outlet of the paper machine screen, and the dosage is 0.2-1.2 kg / ton of paper, preferably 0.3-1.0 kg / ton of paper. The solid content of the glyoxal polyamide resin is 38-48%, the pH value is 7.5-8.5, and the color is a light red liquid. Compared with general wet strength agents, the glyoxal polyamide resin can be used to improve the air permeability of the paper, while the former cannot improve the air permeability.

[0029] Furthermore, in the preferred embodiment of the present invention, 400-mesh precipitated silica is also added during the sizing process, and the dosage can be 2-8 kg / ton of paper, preferably 5-8 kg / ton of paper, which is beneficial to processing and paper properties, and its addition point is usually at the inlet of the paper machine screen.

[0030] After screening, the embodiment of the present invention successively undergoes forming and dewatering on the wire, pressing, pre-drying, surface sizing, post-drying, calendering, and is wound and packed to make high-end notebook paper.

[0031] In the embodiments of the present invention, processes such as forming, dewatering, pressing, and drying on the wire are carried out using conventional processes; the basic processes of forming, pressing, and drying on the wire include: the pulp concentration on the wire is 0.8 - 1.0%, the line pressure in the pressing section is 700 - 900 N / cm; the temperature of the front drying cylinder is 70 - 110 °C, and the temperature of the rear drying cylinder is 70 - 110 °C; soft calendering is carried out in two passes, the line pressure of the calender is 80 - 140 N / cm, and the temperature of the hot roll can be 100 - 140 °C.

[0032] After the front drying section of the paper machine in the embodiments of the present invention, a zirconium-cationic polyvinyl alcohol copolymer compounded with starch is used for surface sizing by means of film transfer. Among them, the zirconium-cationic polyvinyl alcohol copolymer is polymerized from zirconium oxychloride and cationic polyvinyl alcohol, etc. The method of using the zirconium-cationic polyvinyl alcohol copolymer compounded with starch for surface sizing in the present invention can reduce the influence of the starch coating on the drying of ink; the zirconium-cationic polyvinyl alcohol copolymer can utilize its cationic characteristics to effectively adsorb anionic components such as resins in the ink, so that the pigment components in the ink can be fixed on the paper surface to prevent ink bleeding. At the same time, it can form a three-dimensional network structure with starch, enabling the solvent components in the ink to enter the interior of the paper and promoting the drying of the ink. This is a kind of ink-fixing effect, which is beneficial to improving the ink drying effect.

[0033] In a specific embodiment of the present invention, in the formulation of the surface sizing, enzyme-converted starch is compounded with a zirconium-cationic polyvinyl alcohol copolymer for use. The starch uses corn raw starch, and the process conditions specifically include: the mass concentration of the enzyme-converted starch glue can be 12 - 15%, the dosage of amylase is 90 - 120 grams per ton of absolute dry starch, and the sizing amount of the finished paper is preferably 20 - 30 kg / t of paper. The solid content of the zirconium-cationic polyvinyl alcohol copolymer is generally 1 - 3%, the room temperature viscosity is 10 - 20 mPas, the pH value is 7 - 8, and the dosage is 0.5 - 2.0 kg / ton of paper, preferably 0.5 - 1.5 kg / ton of paper; it can be added to the surface sizing feed tank through a metering rod.

[0034] In addition, the method of adding precipitated silica to the pulp in the embodiments of the present invention is more suitable for subsequent film transfer surface sizing. If precipitated silica is directly added to the surface sizing, it will cause poor surface strength of the paper and powder dropping problems. At the same time, in the current production of notebook paper, film transfer surface sizing is basically used, and the particle size of precipitated silica is relatively large, which will cause problems such as wear of the metering rod and sizing roll and poor film formation, and it cannot be applied in actual production when using film transfer surface sizing.

[0035] The embodiments of the present invention provide a notebook paper product obtained by the manufacturing method as described above, which is a high-end notebook paper with fast-drying ink. The basis weight of the product is generally 50 - 100 g / m 2The notebook paper can meet the requirements of quick drying of water-based ink, oil-based ink and neutral ink (e.g., drying within 5 seconds after writing), and the sizing degree of the paper is 2.0 mm, which is better than the general sizing degree (above 1.25 mm).

[0036] In the production of notebook paper, a certain proportion of long-fiber chemical pulp is generally used. According to the experimental research results, the beating degree of long-fiber chemical pulp has a great influence on the drying speed of paper ink. To further improve the ink drying effect, in the embodiments of the present invention, the beating degree of the mixed pulp (a mixed pulp of sulfate softwood chemical pulp and sulfate hardwood chemical pulp) is controlled at 25-32°SR to increase the air permeability of the paper, improve the ink absorption property, and enhance the ink drying effect. From the experiments, when the beating degree is controlled below 32°SR, the ink drying speed is good, but too low a beating degree will result in relatively low paper strength. Considering both the strength and the quick-drying performance of the ink, it is more appropriate to control the beating degree at 25-32°SR.

[0037] The following are the experimental results of the influence of the beating degree on the ink drying speed. The specific paper machine conditions for this experiment are as follows: the pulp ratio is 15% by weight of sulfate softwood chemical pulp and 85% by weight of sulfate softwood chemical pulp, the pulp web concentration is 0.9%, the line pressure in the press section is 800 N / cm, the temperature of the front drying cylinders is 70-110°C, the temperature of the rear drying cylinders is 70-110°C, two-stage soft calendering is used for calendering, and the line pressures of the calendering are 90 and 110 N / cm respectively, and the temperature of the hot roll is 120°C. In terms of auxiliary materials, 400-mesh precipitated silica is added at the inlet of the paper machine screen, with a dosage of 5 kg per ton of paper; glyoxal polyamide resin is added at the outlet of the paper machine screen, with a dosage of 0.6 kg per ton of paper; and zirconium-cationic polyvinyl alcohol copolymer is added in surface sizing, with a dosage of 1.0 kg per ton of paper.

[0038] Table 1 Influence of the beating degree of sulfate softwood chemical pulp

[0039]

[0040] In the embodiments of the present invention, after the sulfate softwood kraft pulp (NBKP) and the sulfate hardwood kraft pulp (LBKP) are co-pulped, glyoxal polyamide resin is added into the pulp to expand the fiber network structure of the paper sheet and improve the ink absorbency of the paper. In the production of notebook paper, especially high-end notebook paper, a large amount of chemical pulp needs to be blended for production. For chemical pulp fibers, whether they are hardwood chemical pulp fibers or softwood chemical pulp fibers, they need to go through chemical cooking. In the case of lignin removal, the fibers become soft and plastic, resulting in a tight combination between the formed paper fibers, low porosity and air permeability of the paper, further leading to poor ink absorbency of the paper, and then making it difficult for the ink to dry during the writing process of notebook paper, which is likely to cause the problem of smudging during writing. In the present invention, the added glyoxal polyamide resin cross-links with the fibers in the pulp to bridge between the fibers and form a three-dimensional network structure, which can effectively increase the porosity and air permeability of the paper, thereby improving the ink absorbency of the paper and further improving the drying speed of the ink during writing.

[0041] Adding point: the outlet of the paper machine screen, dosage 0.3 - 1.0 kg / ton of paper; the following is the specific experimental process and experimental results.

[0042] The experiments on the influence of glyoxal polyamide resin on the air permeability of the paper and the ink drying effect include:

[0043] The pulp ratio is 15% by weight of sulfate softwood chemical pulp and 85% by weight of sulfate softwood chemical pulp. The beating degree of the above mixed pulp is 28°SR, the pulp web concentration is 0.88%, the line pressure in the press section is 750 N / cm, the temperature of the front drying cylinder is 70 - 110 °C, the temperature of the rear drying cylinder is 70 - 110 °C, and two soft calenders are used for calendering, and the line pressures of the calendering are 100 and 100 N / cm respectively, and the temperature of the hot roll is 130 °C. In terms of auxiliary materials, 400-mesh precipitated silica is added at the inlet of the paper machine screen, with a dosage of 6 kg / ton of paper; glyoxal polyamide resin is added at the outlet of the paper machine screen, and the dosage is adjusted between 0 and 1.2 kg / ton of paper; zirconium-cationic polyvinyl alcohol copolymer is added in surface sizing, with a dosage of 1.0 kg / ton of paper.

[0044] The results are shown in Table 2 (the basis weight of the paper is 70 g / m 2 , in the experiment, the water absorbency of the paper is controlled at 22 - 24 g / m 2 ), when the dosage of glyoxal polyamide resin is within 0 to 1.0 kg / ton of paper, with the increase of the dosage, the ink drying speed of the paper (referring to the time when it no longer smudges after writing, the shorter the time, the better the drying effect) is continuously improved.

[0045] Table 2 Influence of glyoxal polyamide resin on the air permeability of the paper and the ink drying effect

[0046]

[0047] In the present invention, a zirconium-cationic polyvinyl alcohol copolymer is compounded with starch for surface sizing to reduce the influence of the starch coating on the drying of ink. The zirconium-cationic polyvinyl alcohol copolymer is added to the surface sizing feed tank through a metering rod, and the dosage is 0.5 - 1.5 kg per ton of paper. Since the notebook paper is basically sized with starch on the surface, an ink barrier layer is formed on the paper surface, which hinders the solvent components in the ink from entering the interior of the paper sheet, thereby resulting in a decrease in the ink drying performance. The zirconium-cationic polyvinyl alcohol copolymer can utilize its cationic properties to effectively adsorb anionic components such as resins in the ink, enabling the pigment components in the ink to adhere to the paper surface and preventing ink bleeding. At the same time, the zirconium-cationic polyvinyl alcohol copolymer is compounded with starch to form a three-dimensional network structure, allowing the solvent components in the ink to enter the interior of the paper sheet and promoting ink drying.

[0048] The following are the experiments and results regarding the influence of the zirconium-cationic polyvinyl alcohol copolymer on the ink drying effect of paper: In the experiment, the basis weight of the base paper is 70 g / m 2 , and the water absorbency of the paper is 22.5 g / m 2 .

[0049] The specific raw materials, sizing processes, etc. of the experiment are as follows:

[0050] The pulp ratio is 20% by weight of softwood kraft pulp and 80% by weight of softwood kraft pulp. The beating degree of the mixed pulp is 30°SR. The pulp consistency on the wire is 0.86%. The line pressure in the press section is 850 N / cm. The temperature of the front drying cylinders is 70 - 110°C, and the temperature of the rear drying cylinders is 70 - 110°C. Two-stage soft calendering is used for calendering, and the line pressures of the calendering are 95 and 130 N / cm respectively, and the temperature of the hot roll is 125°C. In terms of auxiliary materials, 400-mesh precipitated silica is added at the inlet of the paper machine screen, and the dosage is 7 kg per ton of paper; glyoxal polyamide resin is added at the outlet of the paper machine screen, and the dosage is 0.8 kg per ton of paper; the zirconium-cationic polyvinyl alcohol copolymer is added to the surface sizing, and the dosage varies from 0 to 2 kg per ton of paper.

[0051] According to the experimental results in Table 3, when the dosage of the zirconium-cationic polyvinyl alcohol copolymer is within 0.5 - 1.5 kg per ton of paper, the ink drying speed of the paper continuously improves with the increase in dosage.

[0052] Table 3 Influence of the zirconium-cationic polyvinyl alcohol copolymer on the ink drying effect of paper

[0053]

[0054] Note: The method for testing the ink drying speed: Hold the gel pen or water-based pen at an inclination angle of 60-70 degrees to the paper surface of the writing paper. Write the numbers "1, 2, 3, 4, 5" within 2 seconds. Start timing from the completion of the last stroke. Wipe the handwriting with a finger with a force of about 50 grams (the finger is required to be dry). The writing paper needs to be stored in an environment with a temperature of 15-25°C and a humidity of 50-60% for more than 6 hours before the test. Observe whether there is any blurring or dragging of the handwriting. Until there is no blurring or dragging of the handwriting, the time recorded at this time is the ink drying speed (drying time).

[0055] The main technical innovation points of the embodiments of the present invention include: (1) By adding glyoxal polyamide resin in the pulp, the fiber network structure of the paper page is expanded, and the ink absorbency of the paper is improved. (2) Using zirconium-cationic polyvinyl alcohol copolymer compounded with starch for surface sizing to reduce the influence of the starch coating on ink drying; the zirconium-cationic polyvinyl alcohol copolymer can utilize its cationic characteristics to effectively adsorb anionic components such as resins in the ink, so that the pigment components in the ink can be fixed on the paper surface to prevent bleeding of the ink. At the same time, it can form a three-dimensional network structure with starch, enabling the solvent components in the ink to enter the interior of the paper page and promoting ink drying. (3) To further improve the ink drying effect, the present invention preferably controls the beating degree of the long-fiber chemical pulp at 25-32°SR to improve the air permeability of the paper, which is beneficial to improving ink absorbency and ink drying effect, etc.

[0056] The fast-drying notebook paper product for ink writing provided by this application can be used as the paper for hardcover books, high-grade exercise books, handwritten notebooks, and record books. The product has excellent quality, which is of great significance for promoting the development of high-end notebook paper by enterprises, improving the profit level, making up for the domestic technical gap, and leading the technological trend.

[0057] To better understand the technical content of the present invention, specific embodiments are provided below to further illustrate the present invention. In the following embodiments, unless otherwise specified, they are all mass ratios; the raw materials used are all commercially available and conventional equipment is used.

[0058] Among them, the characteristics of each pulp raw material include: The average length of the sulfate chemical softwood pulp fiber is 2.0-3.0 mm, and the average length of the sulfate chemical hardwood pulp fiber is 0.6-1.0 mm. Enzyme-converted starch is used, and the starch is corn raw starch. The process conditions specifically include: the mass concentration of the enzyme-converted starch glue is 12-15%, and the dosage of amylase is 100-110 grams per ton of absolute dry starch. The solid content of the zirconium-cationic polyvinyl alcohol copolymer is 1-3%, the room temperature viscosity is 10-20 mpas, and the PH value is 7-8. The solid content of the glyoxal polyamide resin is 38-48%, the PH value is 7.5-8.5, and the color is a light red liquid.

[0059] Example 1

[0060] It is made by mixing sulfate chemical softwood pulp (NBKP) and sulfate chemical hardwood pulp (LBKP) with weight percentages of 10% and 90% respectively, and the beating degree of the mixed pulp is 25°SR. After mixing, the pulp is adjusted to a concentration of 3.3%, passed through a thick pulp screen, then diluted, de-sanded and de-aerated, sized, finely screened, formed and dehydrated on the wire, pressed, pre-dried, surface-sized, post-dried, calendered, wound and packed to make high-end notebook paper.

[0061] Glyoxal polyamide resin is added into the pulp, the addition point is the outlet of the paper machine screen, and the dosage is 0.3 kg / ton of paper; 400-mesh precipitated silica is added into the pulp, the dosage is 6.5 kg / ton of paper, and the addition point is the inlet of the paper machine screen; zirconium-cationic polyvinyl alcohol copolymer is compounded in the surface sizing starch, and the zirconium-cationic polyvinyl alcohol copolymer is added into the surface sizing feed tank through a metering rod, and the dosage is 1.5 kg / ton of paper.

[0062] The pulp concentration on the wire is 0.87%, the line pressure in the press section is 820 N / cm, the temperature of the pre-drying cylinders is 70 - 110 °C, the temperature of the post-drying cylinders is 70 - 110 °C, two soft calenders are used for calendering, and the line pressures of the calenders are 85 and 126 N / cm respectively, and the temperature of the hot roll is 130 °C.

[0063] It is measured that the basis weight of the product is 100 g / m 2 ; the drying speed of water-based pen ink on the paper is 1 s, the drying speed of oil-based pen ink is 3 s; the drying speed of gel pen ink is 3 s, the sizing degree of the paper is 2.0 mm, and the ink does not bleed or feather when writing on the paper.

[0064] Figure 1 It is the comparison effect diagram of ink drying when writing with a representative gel pen ink. The high-end notebook paper using the ink quick-drying technology has much better ink drying performance than the notebook paper without using the quick-drying technology. Moreover, the notebook paper with quick-drying ink prepared by the present invention has passed the expert review, and among them, the ink quick-drying technology reaches the international leading level.

[0065] Example 2

[0066] It is made by mixing sulfate chemical softwood pulp (NBKP) and sulfate chemical hardwood pulp (LBKP) with weight percentages of 20% and 80% respectively, and the beating degree of the mixed pulp is 28°SR. After mixing, the pulp is adjusted to a concentration of 3.5%, passed through a thick pulp screen, then diluted, de-sanded and de-aerated, sized, finely screened, formed and dehydrated on the wire, pressed, pre-dried, surface-sized, post-dried, calendered, wound and packed to make high-end notebook paper.

[0067] Add glyoxal polyamide resin in the pulp. Adding point: the outlet of the paper machine screen, dosage: 0.6 kg per ton of paper; add precipitated silica with 400 meshes in the pulp, dosage: 6.3 kg per ton of paper, adding point: the inlet of the paper machine screen; compound zirconium-cationic polyvinyl alcohol copolymer in the surface sizing starch, and the zirconium-cationic polyvinyl alcohol copolymer is added to the surface sizing feed tank through a metering rod, dosage: 0.8 kg per ton of paper.

[0068] The pulp web forming consistency is 0.83%, the line pressure of the press section is 820 N / cm, the temperature of the front drying cylinders is 70 - 110 °C, the temperature of the rear drying cylinders is 70 - 110 °C, two-pass soft calendering is adopted for calendering, the line pressures of the calendering are 85 and 120 N / cm respectively, and the temperature of the hot roll is 138 °C.

[0069] It is measured that the basis weight of the product is 70 g / m 2 ; the drying speed of the water-based pen ink on the paper is 5 s, the drying speed of the oil-based pen ink is 5 s, and the drying speed of the gel pen ink is 5 s; the sizing degree of the paper is 2.0 mm, and the ink writing on the paper does not dissolve in water and does not bleed.

[0070] Example 3

[0071] Use sulfate softwood kraft pulp (NBKP) and sulfate hardwood kraft pulp (LBKP) for co-papermaking, with weight percentages of 30% and 70% respectively, and the mixed beating degree is 31°SR. The mixed pulp is adjusted to a concentration of 3.2%, passed through a thick pulp screen, and then subjected to pulp washing, sand and gas removal, sizing, fine screening, web forming and dehydration, pressing, pre-drying, surface sizing, post-drying, calendering, winding, and packing to make high-end notebook paper.

[0072] Add glyoxal polyamide resin in the pulp. Adding point: the outlet of the paper machine screen, dosage: 1.0 kg per ton of paper; add precipitated silica with 400 meshes in the pulp, dosage: 5.0 kg per ton of paper, adding point: the inlet of the paper machine screen; compound zirconium-cationic polyvinyl alcohol copolymer in the surface sizing starch, and the zirconium-cationic polyvinyl alcohol copolymer is added to the surface sizing feed tank through a metering rod, dosage: 1.5 kg per ton of paper.

[0073] The pulp web forming consistency is 0.83%, the line pressure of the press section is 820 N / cm, the temperature of the front drying cylinders is 70 - 110 °C, the temperature of the rear drying cylinders is 70 - 110 °C, two-pass soft calendering is adopted for calendering, the line pressures of the calendering are 85 and 120 N / cm respectively, and the temperature of the hot roll is 138 °C.

[0074] It is measured that the basis weight of the product is 80 g / m 2 ; the drying speed of the water-based pen ink on the paper is 3 s, the drying speed of the oil-based pen ink is 1 s, and the drying speed of the gel pen ink is 1 s; the sizing degree of the paper is 2.0 mm, and the ink writing on the paper does not dissolve in water and does not bleed.

[0075] As can be seen from the above embodiments, the present invention mainly adds glyoxal polyamide resin in the pulp to expand the fiber network structure of the paper sheet and improve the ink absorbency of the paper. At the same time, a method of surface sizing with a zirconium-cationic polyvinyl alcohol copolymer compounded with starch is adopted to reduce the influence of the starch coating on the drying of the ink. The ink quick-drying technology of the present invention can enable the notebook paper to dry the ink quickly during writing, effectively prevent smudging, and at the same time ensure that the paper has good sizing performance, does not bleed ink or dissolve in water. This technology reaches the international leading level and has broad prospects.

[0076] It should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0077] Specific examples are used in this article to elaborate on the principle and implementation mode of the present invention. The description of the above examples is only used to help understand the method and its core idea of the present invention. The above is only the preferred implementation mode of the present invention. It should be pointed out that due to the limited nature of the written expression, and objectively there are infinite specific structures. For those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements, retouches or changes can be made, and the above technical features can also be combined in an appropriate manner; these improvements, retouches, changes or combinations, or directly applying the concept and technical solution of the invention to other occasions without improvement, should all be regarded as the protection scope of the present invention.

Claims

1. A manufacturing method of a notebook paper with quick-drying ink writing, characterized in that, It includes the following steps: Using sulfate chemical softwood pulp and sulfate chemical hardwood pulp for combined papermaking, controlling the beating degree of the mixed pulp at 20 - 35°SR; through screening, sizing, forming by dewatering on the wire section, pressing, pre-drying, surface sizing, post-drying, and calendering, a notebook paper with fast drying for ink writing is made; Among them, glyoxal polyamide resin is added during the sizing process, and the surface sizing is carried out using a zirconium-cationic polyvinyl alcohol copolymer compounded with starch.

2. The manufacturing method of the notebook paper according to claim 1, characterized in that, The weight percentage of the combined papermaking of the sulfate chemical softwood pulp and the sulfate chemical hardwood pulp is 10 - 30%: 70 - 90%.

3. The manufacturing method of the notebook paper according to claim 1, characterized in that, The beating degree of the mixed pulp is controlled at 25 - 32°SR.

4. The manufacturing method of the notebook paper according to any one of claims 1-3, characterized in that, Precipitated silica is also added during the sizing process, the addition point is the inlet of the paper machine screen, and the dosage is 2 - 8 kg per ton of paper.

5. The manufacturing method of the notebook paper according to claim 4, characterized in that, The glyoxal polyamide resin added during the sizing process is added at the outlet of the paper machine screen, and the dosage is 0.2 - 1.2 kg per ton of paper.

6. The manufacturing method of the notebook paper according to claim 5, characterized in that, The dosage of the zirconium-cationic polyvinyl alcohol copolymer for surface sizing is 0.5 - 2.0 kg per ton of paper.

7. The manufacturing method of the notebook paper according to claim 6, characterized in that, The dosage of the glyoxal polyamide resin during the sizing process is 0.3 - 1.0 kg per ton of paper; the dosage of the zirconium-cationic polyvinyl alcohol copolymer for surface sizing is 0.5 - 1.5 kg per ton of paper.

8. The manufacturing method of the notebook paper according to claim 4, characterized in that, The precipitated silica added during the sizing process is 400 mesh; the surface sizing is carried out by the film transfer method.

9. The notebook paper obtained by the manufacturing method according to any one of claims 1-8, with a basis weight of 50-100 g / m 2 .

10. The notebook paper according to claim 9, wherein The notebook paper meets the requirements of fast drying for writing with water-based ink, oil-based ink, and neutral ink, and the sizing degree of the paper is 2.0 mm.

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