CN112195683A - In-machine coated color drawing paper and manufacturing method and application thereof - Google Patents
In-machine coated color drawing paper and manufacturing method and application thereof Download PDFInfo
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- CN112195683A CN112195683A CN202011073324.XA CN202011073324A CN112195683A CN 112195683 A CN112195683 A CN 112195683A CN 202011073324 A CN202011073324 A CN 202011073324A CN 112195683 A CN112195683 A CN 112195683A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
- D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
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Abstract
The invention provides an in-machine coated color drawing paper and a manufacturing method and application thereof, wherein the method comprises the following steps: s1, preparing the pulped softwood pulp, hardwood pulp and poplar chemi-mechanical pulp; the weight ratio of the softwood pulp, the hardwood pulp and the poplar chemi-mechanical pulp is 25-30: 30-40: 30-45; the freeness of the beaten softwood pulp is 275-325 mL; s2, adding auxiliary materials after the pulp is prepared, and making paper to obtain wet paper; and S3, sequentially carrying out pre-drying, specific in-machine coating, post-drying and calendaring on the wet paper to obtain the in-machine coated color drawing paper. The in-machine coating color drawing paper provided by the invention has the characteristics of smooth and fine surface, good stiffness and surface strength and the like, when the in-machine coating color drawing paper is applied to eight-color rotary printing, a color printing image is clear and vivid, the color is bright and full, the layering sense is strong, the color restoration is good, the cost is lower than that of the existing coated paper, and the in-machine coating color drawing paper has a great market competitive advantage.
Description
Technical Field
The invention belongs to the technical field of papermaking, and particularly relates to in-machine coated color drawing paper and a manufacturing method and application thereof.
Background
The cultural printing paper plays an important role in paper products in China and is an important component of the paper making industry in China all the time. According to the product quality, the cultural printing paper can be generally divided into newsprint, writing paper, double-sided offset paper, coated paper and the like.
Among them, the double offset paper is also called double-sided offset printing paper, and the cultural printing paper typically represents one of the paper types, is a higher-grade printing paper, and is generally specially used for offset printing machines to perform color register printing, book plate making or color plate printing. The conventional preparation process is to coat sizing materials on two sides of base paper in the paper making process so as to improve the surface physical properties. The double-sided offset paper is required to have smooth and fine surface, small elasticity, uniform ink absorption, good smoothness, compact texture, good whiteness, strong water resistance, better evenness, surface strength and opacity, higher bulk, stiffness and the like so as to meet the higher printing adaptability requirement.
The double-sided offset paper has wide application, is the first choice for various books and textbooks, and is widely used for high-grade books, textbooks and teaching materials and tutoring materials; and secondly, the method is also used for printing picture albums, color insets, trademarks, covers, books and the like, and specifically comprises the following steps: magazines, color sheets, catalogs, maps, calendars, covers, inserts, illustrations, product specifications, brochures, comics, cartoon books, advertising posters, business albums, flyers, envelopes, books, notebooks, colored embossing, forms, office/document papers, business cards, color trademarks, and various packaging items, among others. In recent years, due to the improvement of culture and living standard of people, book materials are developed to high grade, and books, periodicals and books and the like are printed more and more by using double-sided offset paper. Because the double-sided offset paper has the advantages of white, stiff, smooth, fine and smooth quality and the like, after the book is made, characters are clear, the book is flat and is not easy to deform, and compared with letterpress and newsprint books, the book has a different grade and is deeply welcomed by readers.
Coated paper is a coating-processed paper for coated printing, and is high-grade printing paper made by coating white coating on base paper. The coated paper comprises single-sided coated paper, double-sided coated paper, matt coated paper and cloth-grain coated paper. Depending on the application, there are flat sheets and webs. The coated paper is characterized by very smooth and flat paper surface, high smoothness and good glossiness. The weight of the coated paper is generally 70-150 g/m2The paper is uniform and compact, the whiteness is higher (more than 85 percent), the coating is firm and consistent, and exquisite and clear patterns and characters can be conveniently obtained after printing. The coated paper is mainly used for printing advanced books and periodicals, product catalogs, various exquisite commercial advertisements, samples, color pictures and newspapers, juvenile books, travel manuals, maps, post advertisements, poster posters, inserts of newspapers and the like. The daily-used exquisite wall calendars, stickers sold in bookstores, covers of books, illustrations, art books, picture books and the like are mostly coated papers, and various exquisite decoration packages, paper handbags, labels, trademarks and the like are also used in large quantities.
However, the cost of coated paper products is relatively high. Compared with coated paper, the surface of the double-sided offset paper is not smooth and fine, and when the double-sided offset paper is applied to color commercial rotary printing, a printed image is not clear and vivid enough, the color is not bright and full enough, the layering sense is poor, the color restoration is poor, and the printing is not exquisite enough.
Disclosure of Invention
In view of the above, the application provides an in-machine coated color paper and a manufacturing method and application thereof, the in-machine coated color paper provided by the invention has smooth and fine surface, good stiffness and surface strength, clear and vivid color printing image, bright and full color, strong layering sense and good color restoration when being applied to eight-color rotary printing, and has higher market competition advantage because the cost is lower than that of the existing art paper.
The invention provides a method for manufacturing in-machine coated color drawing paper, which comprises the following steps:
s1, preparing the pulped softwood pulp, hardwood pulp and poplar chemi-mechanical pulp; the weight ratio of the softwood pulp, the hardwood pulp and the poplar chemi-mechanical pulp is 25-30: 30-40: 30-45; the freeness of the beaten softwood pulp is 275-325 mL;
s2, adding auxiliary materials after the pulp is prepared, and making paper to obtain wet paper;
s3, sequentially carrying out pre-drying, in-machine coating, post-drying and calendaring on the wet paper to obtain in-machine coated color drawing paper;
the coating adopted by the coating in the machine comprises the following components in parts by weight: 80-90 parts of GCC, 10-20 parts of kaolin, 9-11 parts of latex, 10-12 parts of starch, 0.1-0.2 part of CMC, 0.5-1.5 parts of lubricant and 0.5-1.5 parts of water repellent agent.
Preferably, the freeness of the pulped hardwood pulp is 350-400 mL; the freeness of the pulped poplar chemi-mechanical pulp is 190-235 mL.
Preferably, the auxiliary materials comprise alkyl ketene dimer, filler, cationic starch, polyacrylamide and bentonite; the weight ratio of the filler to the oven dry pulp is 15-18%, and the weight ratio of the cationic starch to the oven dry pulp is 0.9-1.1%.
Preferably, in the auxiliary materials, the weight ratio of the alkyl ketene dimer to the oven dry pulp is 0.1-0.3%, the weight ratio of the polyacrylamide to the oven dry pulp is 400-600 ppm, and the weight ratio of the bentonite to the oven dry pulp is 0.2-0.4%.
Preferably, the wet paper has a basis weight of 59-63g/m2And squeezing until the dryness of the paper is more than or equal to 39%, and then carrying out pre-drying, wherein the temperature of the pre-drying is controlled to be 90-130 ℃, and the paper is coated in a machine when the dryness of the paper is more than or equal to 95%.
Preferably, the solid content of the coating adopted by the coating in the machine is 60-65%; the coating weight of the coating in the machine is 16-20 g/m2。
Preferably, the post-drying temperature is 40-130 ℃, and the calendering treatment is carried out when the dryness of the paper sheet is more than or equal to 93%.
The invention provides the in-machine coated color paper obtained by the manufacturing method, and the quantitative ratio is 80.0 +/-1.0 g/m2The whiteness is ISO 81-83%, the opacity is 90-92%, and the bulk is more than or equal to 1.25cm3Per g, smoothness is 50-60 s.
Preferably, the moisture content of the in-machine coating color drawing paper is 5.0-7.0%, and the surface absorption weight is less than or equal to 25g/m2The longitudinal fracture length is more than or equal to 5500m, and the printing surface strength is more than or equal to 1.0 m/s.
The present invention provides the use of a machine coated color paper as hereinbefore described in colour commercial rotary printing.
The invention provides a method for manufacturing in-machine coating color drawing paper, which comprises the following steps: using respectively pulped softwood pulp, hardwood pulp and poplar chemi-mechanical pulp, adding pulp and auxiliary materials, making wet paper, pre-drying, coating in a machine, post-drying, press polishing and finishing and other process steps; the obtained machine-coating color drawing paper is a high-grade paper product between double offset paper and art paper. In the invention, the softwood pulp, the hardwood pulp and the poplar chemi-mechanical pulp in a certain ratio are used, the characteristics of the three pulps are considered, and the respective advantages are exerted. The poplar chemi-mechanical pulp is used in the invention, so that the surface smoothness and the printability of the colored drawing paper can be improved, and conditions are provided for subsequent coating processing. In addition, the freeness of the softwood pulp is 275-325 mL after pulping, and the control of the freeness of the softwood pulp is important for the tensile strength and the surface strength of the colored drawing paper. Meanwhile, the invention adopts a unique coating formula and is also an important guarantee for producing and obtaining the final high-quality colored drawing paper product.
The in-machine coating color drawing paper provided by the invention has the characteristics of fine surface, uniform coating, good stiffness, good bulk, high opacity, high surface strength, good ink absorbability and the like. The invention can effectively improve the surface fineness, printing performance and color reduction performance of the color painting paper by a treatment mode of coating the surface of the base paper in the machine, and can greatly improve the ash content of the paper after coating, thereby reducing the production cost. The product can be applied to eight-color rotary printing, the color printing image is clear and vivid, the color is bright and full, the layering sense is strong, the color is good, and the product is exquisite in printing, widely applied to printing of high-grade books and periodicals, color paintings, color albums, exquisite magazines and the like, is popular with customers and has wide market potential.
Drawings
FIG. 1 is a comparison of the color paper print samples obtained in example 1.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a method for manufacturing in-machine coated color drawing paper, which comprises the following steps:
s1, preparing the pulped softwood pulp, hardwood pulp and poplar chemi-mechanical pulp; the weight ratio of the softwood pulp, the hardwood pulp and the poplar chemi-mechanical pulp is 25-30: 30-40: 30-45; the freeness of the beaten softwood pulp is 275-325 mL;
s2, adding auxiliary materials after the pulp is prepared, and making paper to obtain wet paper;
s3, sequentially carrying out pre-drying, in-machine coating, post-drying and calendaring on the wet paper to obtain in-machine coated color drawing paper;
the coating adopted by the coating in the machine comprises the following components in parts by weight: 80-90 parts of GCC, 10-20 parts of kaolin, 9-11 parts of latex, 10-12 parts of starch, 0.1-0.2 part of CMC, 0.5-1.5 parts of lubricant and 0.5-1.5 parts of water repellent agent.
The machine-coated color painting paper product provided by the invention has the characteristics of fine and smooth surface, uniform coating, good stiffness, good bulk, high opacity, high surface strength, good ink absorbency and the like, and when the machine-coated color painting paper product is applied to eight-color rotary printing, a color printing image is clear and vivid, the color is bright and full, the layering sense is strong, and the color is good in restoration. The product has lower cost than the prior art and the quality close to the level of the art paper, thereby being beneficial to being widely used for printing high-grade books and periodicals, color paintings, color albums, exquisite magazines and the like.
According to the embodiment of the invention, softwood pulp, hardwood pulp and poplar chemi-mechanical pulp with freeness meeting the requirement after pulping are adopted, and the three kinds of pulp are mixed according to a certain proportion.
Wood pulp is generally classified according to pulp material, pulping method, use, and the like, and chemical pulp such as kraft softwood pulp, mechanical wood pulp, chemimechanical wood pulp, refined wood pulp, and the like are exemplified. The softwood pulp and the hardwood pulp are respectively pulp prepared by taking softwood (such as pine) and hardwood (including eucalyptus, poplar, birch and the like) as raw materials, are mainly chemical pulp types, and can be prepared by adopting common pulp in the field.
The poplar chemi-mechanical pulp can be Italian poplar APMP pulp, and the pulping process comprises mild chemical treatment and mechanical pulping. The mechanical grinding has high yield (80-90%) because most of lignin is reserved; chemical pulping is carried out at higher temperatures with chemicals such as NaOH and Na2S removes almost all lignin in the wood chips, and the yield is lower and is only 40-50%. The bleaching of chemical pulp is also mainly based on further delignification, and the conditions are more severe. It is because of the great differences in pulping and bleaching processes that italian poplar APMP pulp and hardwood chemical pulp have distinct characteristics.
In comparison to hardwood chemical pulps, italian poplar APMP pulp is relatively coarse and stiff in fibers and does not easily collapse, and high bulk is a typical characteristic of italian poplar APMP pulp. Italian poplar APMP pulp contains less long fibers and more fines. The Italian poplar APMP pulp not only has high content of fine fibers, but also has more damages and fragments on the surface of the fibers. The fiber size distribution of italian poplar APMP pulp, of course, depends to a large extent on its chemical treatment conditions and the freeness of the pulp. Higher fines content is an important feature of spaghetti APMP pulp, and fines have a very important impact on the structure and physical properties of paper.
The pulp proportion described in the scheme of the invention is that softwood pulp, hardwood pulp and poplar chemi-mechanical pulp are 25-30: 30-40: 30-45; the optimum slurry proportion is obtained through a large amount of experimental research and theoretical analysis, Italian poplar APMP slurry can be used to the maximum extent, the characteristics of the three slurries are considered, and the respective advantages are exerted. In the specific embodiment of the application, the mixed pulp weight ratio of three pulps, namely softwood pulp, hardwood pulp and poplar chemi-mechanical pulp can be 25%: 30%: 45%, 30%: 40%: 30%, 25%: 40%: 35 percent. The embodiment of the invention can improve the surface smoothness and printability of the colored drawing paper by using 30-45 parts of Italian poplar APMP pulp, and provides conditions for subsequent coating processing. Experimental research shows that when the proportion of the Italy poplar APMP pulp exceeds 50 parts, the surface roughness of the manufactured color painting paper is large, the smoothness is poor, stripes and spots are easy to appear in subsequent coating processing, and the final paper printability is possibly adversely affected.
According to the embodiment of the invention, softwood pulp, hardwood pulp and poplar chemi-mechanical pulp can be respectively pulped, and the freeness of the pulped pulp is specifically as follows: 275-325 mL of softwood pulp; 350-400 mL of broad-leaved wood pulp; 190-235 mL of poplar chemi-mechanical pulp. Canadian standard freeness (c.s.f.) is one of the methods for measuring the drainage performance of pulp, and freeness can be converted into each other.
After the proportioning of the sizing agent is determined, the performance of the color-painted paper product, such as strength, smoothness, bulk, printing performance and the like, is directly determined by whether the sizing agent beating degree is proper or not. The paper properties largely depend on the quality of beating; the physical properties, structural forms and chemical compositions of the fibers of different types of pulp are different, and the difficulty degree of pulping and the properties of finished paper are also different greatly. The pulp is pulped, so that on one hand, the binding force of the fibers is increased, and meanwhile, the average length of the fibers is reduced. It can increase the tensile strength, bursting strength and folding strength of paper, and increase the smoothness, stiffness and tightness of paper, but reduce the tearing strength and opacity of finished paper, and increase the shrinkage of paper. With the progress of beating, the binding force of pulp fibers continuously rises, and the average length of the fibers continuously falls.
In the scheme of the invention, the freeness of the softwood pulp after pulping is mainly controlled to be 275-325 mL. Experimental research shows that the control of the beating degree of the kraft softwood pulp is important for the tensile strength and the surface strength of the colored drawing paper. In commercial rotary printing, the paper must have a certain longitudinal tension to ensure no end breakage and no paper jam during printing, and the matching of the kraft softwood pulp can provide good strength performance indexes for the base paper and the finished paper. A large number of color drawing paper matching tests show that the freeness of the sulfate softwood pulp is optimal within the range of 275-325 mL, so that the paper can be endowed with better strength performance, and meanwhile, the paper has better water filtration performance and paper machine papermaking performance.
Preferably, the freeness of the pulped hardwood pulp is 350-400 mL; the freeness of the pulped poplar chemi-mechanical pulp is 190-235 mL.
After the pulp is prepared, auxiliary materials are added to carry out wet paper making. Wherein, the addition of the auxiliary materials mainly meets the requirements of paper application, and is generally various non-fibrous substances; the auxiliary materials comprise a sizing agent, a filler, a dry strength agent, a retention aid, a water repellent agent and the like. Specifically, the sizing agent is preferably an alkyl ketene dimer; the filler is calcium carbonate, and the dry strength agent is cationic starch. The retention aid is polyacrylamide, preferably cationic PAM, and is beneficial to reducing the loss of fillers and fine fibers in the papermaking process. In an embodiment of the invention, the adjuvants include alkyl ketene dimer, calcium carbonate filler, cationic starch, polyacrylamide and bentonite.
Preferably, the weight ratio of the filler to the oven-dry pulp in the auxiliary material is 15-18%, such as 16% and 17%; the weight ratio of the cationic starch to the oven dry pulp can be 0.9-1.1%, and preferably 1.0-1.1%. The weight ratio of the alkyl ketene dimer to the oven dry pulp is 0.1-0.3%; the weight ratio of the polyacrylamide to the oven dry pulp is 400-600 ppm, and the weight ratio of the bentonite to the oven dry pulp is 0.2-0.4%.
In the auxiliary materials, the scheme of the embodiment of the invention greatly reduces the using amount of the filler, increases the using amount of the cationic starch, and further improves the internal bonding strength and the surface strength of the color painting paper. In the embodiment of the invention, the poplar chemi-mechanical pulp is greatly reduced in the pulp proportioning, the using effect of the sizing agent and the retention aid is greatly improved, and the using amounts of the sizing agent and the retention aid are obviously reduced. The poplar chemi-mechanical pulp fiber is shorter, and can improve physical properties such as opacity, bulk, evenness and the like of finished paper; however, for retention, the poplar chemi-mechanical pulp has more fine fibers, higher cation demand and more anion impurities, so that the retention effect of the retention aid and the sizing effect of the sizing agent can be reduced by using more poplar chemi-mechanical pulp. In addition, in the case of determining the type of paper product and the size, the wet part zeta of the workshop, the potential conductivity, the positive charge demand and the like need to be regularly and systematically detected and analyzed, and the appropriate chemical addition type and amount are determined according to the detection and analysis, so that the appropriate amount of the retention aid is determined.
According to some embodiments of the invention, calcium carbonate filler can be added firstly, and then the calcium carbonate filler is fed into a first-stage four-section conical slag remover through a fan pump to carry out purification and slag removal, and then the calcium carbonate filler enters a degassing tank to carry out degassing treatment; and then, screening the mixture in a pressure screen, wherein cationic starch, polyacrylamide and alkyl ketene dimer of a sizing agent are added at the inlet of the pressure screen, and bentonite is added at the outlet of the pressure screen. The stock is then fed into the headbox of a conventional paper machine in the field to feed the stock onto the wire, the wire flow is adjusted, and the basis weight of the scanned sheet before sizing is controlled.
Paper machines generally consist of two parts, a wet end, which includes a headbox (i.e., headbox), a wire section and a press section; the dry section includes a drying section, a calender section, and a winder. In the examples of the present invention, the wet sheet basis weight obtained was 59 to 63g/m2After the wet paper leaves the net part, the wet paper enters a press part to be pressed in a five-roll three-press-area combined mode until the dryness is more than or equal to 39 percent; and then entering a front drying part, wherein the surface temperature of a drying cylinder is preferably controlled to be 90-130 ℃, and the paper sheet is dried until the dryness of the paper sheet is more than or equal to 95%.
After drying, the surface of the base paper is coated in the machine, namely the base paper enters a sizing press for coating surface treatment, a metering rod type surface sizing machine can be adopted for coating the reverse side of the paper sheet entering from the front drying part, and then the paper sheet is discharged from the surface sizing machine; and (4) continuously carrying out after-drying on the wet paper after the surface sizing advanced treatment.
In the invention, the coating adopted by the machine coating comprises the following components in parts by weight: 80-90 parts of GCC, 10-20 parts of kaolin, 9-11 parts of latex, 10-12 parts of starch, 0.1-0.2 part of CMC, 0.5-1.5 parts of lubricant and 0.5-1.5 parts of water repellent agent. The coating formula is one of core technologies of color-drawing paper production, and is an important guarantee for obtaining a final high-quality color-drawing paper product through a large amount of experimental research and pilot-scale production verification.
In the coating formula, GCC is heavy calcium filler, and the using amount is preferably 85 parts by weight; the amount of kaolin used is preferably 15 parts. The latex is carboxylic styrene-butadiene latex with solid content of 48-52%; the CMC is carboxymethyl cellulose, and the water content is less than or equal to 10 percent; the starch is surface sizing starch, and the water content is less than or equal to 14 percent; the lubricant is calcium stearate emulsion with solid content of 48-52%; the water repellent agent is polyamide polyurea resin with solid content of 48-52%. And the solid content of the coating adopted by the coating in the machine is 60-65 wt%. Generally, the above moisture content and solid content are mass contents.
The conditions for the in-machine coating according to the embodiment of the present invention include: drive side/operating side pressure zone pressure: 17-20 kN/m/17-20 kN/m, and the upper roller/lower roller pressure of the metering rod: 0.8-1.5 bar/0.8-1.5 bar; coating weight: 16 to 20g/m2(ii) a The set value of the paper tension of the glue applying part is 180-220N/m. The processing mode of the coating in the machine can effectively improve the surface fineness, the printing performance and the color reduction performance of the color painting paper, and can greatly improve the ash content of the paper after coating, thereby reducing the production cost.
In the embodiment of the invention, the drying temperature after coating can be 40-130 ℃, and the dryness of the paper sheet of the drying part after the paper sheet is taken out is more than or equal to 93 percent; the paper sheet entering from the post-drying section enters a calendering zone to perform calendering treatment on the paper sheet. The calendering conditions of the embodiment of the invention comprise: the calendering hot roll temperature was 50/50 ℃ and the line pressure was 15kN/m and 10kN/m, respectively. In addition, other parameters of the paper machine include: the wire speed is 1180m/min, the pulp wire speed ratio is 1.032, and the first line pressing pressure is as follows: 162-168 kN/m, two-line pressure: 715-745 kN/m, opening degree of a lip: 9.0 ~ 10.0mm, hard pressure light pressure: 0-10 kN/m, hard calendering paper tension: 130 to 190N/m.
After calendaring, the paper is reeled by the embodiment of the invention, and the machine-coating color drawing paper can be obtained.
The embodiment of the invention provides the in-machine coating color drawing paper obtained by the manufacturing method, and the quantitative ratio of the in-machine coating color drawing paper is 80.0 +/-1.0 g/m2The whiteness is ISO 81-83%, the opacity is 90-92%, and the bulk is more than or equal to 1.25cm3Per g, smoothness is 50-60 s. The moisture content of the in-machine coating color drawing paper is 5.0-7.0 wt%, and the surface absorption weight is less than or equal to 25g/m2The longitudinal fracture length is more than or equal to 5500m, and the printing surface strength is more than or equal to 1.0 m/s.
Further, embodiments of the present invention also provide the use of the machine coated color paper as described above in color commercial rotary printing. The machine-coated color painting paper prepared by the embodiment of the invention has smooth and fine surface, good stiffness and surface strength, accurate overprinting, clear printing pattern, full color and good printing effect, and can be applied to eight-color rotary printing and the like. The paper product provided by the invention is exquisite in printing and can be widely used for printing high-grade books and periodicals, propaganda advertisements, color pictures and newspapers, albums and exquisite magazines. The product has the cost lower than that of coated paper, has the quality close to that of the coated paper, is green and environment-friendly printing paper with high added value and resource saving, and has great market competitive advantage.
For further understanding of the present application, the machine-coated color paper provided herein, and the manufacturing method and application thereof, are specifically described below with reference to examples. It should be understood, however, that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention, which is defined by the following examples.
Example 1:
according to 25%, the method comprises the following steps of pulping softwood pulp (275-325 mL), hardwood pulp (350-400 mL) and poplar chemi-mechanical pulp (190-235 mL) with freeness meeting requirements: 30%: blending pulp according to the proportion of 45 percent; then 17 percent of calcium carbonate filler is added and is sent into the mortar pumpPurifying and deslagging by using a four-stage conical deslagging device, and then degassing in a degassing tank; then the mixture enters a pressure screen for screening treatment (the dosage of cationic PAM is 0.6 kg/ton paper, the dosage of cationic starch is 10 kg/ton paper, the dosage of sizing agent alkyl ketene dimer is 1.5 kg/ton paper is added at the inlet of the pressure screen, and the dosage of bentonite is 2.2 kg/ton paper is added at the outlet of the pressure screen); then feeding the paper into a head box to be netted, adjusting the flow rate of netted paper, and controlling the scanned paper ration before sizing to be 62g/m2Left and right; after the wet paper leaves the net part, the wet paper enters a press part for five-roll three-press-area combined pressing, and the wet paper enters a front drying part after being pressed until the dryness is more than or equal to 39%; controlling the surface temperature of the drying cylinder at 90-130 ℃ to dry the paper until the dryness of the paper is more than or equal to 95%; and (4) entering a sizing press for coating surface treatment.
The formula of the coating is as follows: GCC 85 parts, kaolin 15 parts, latex 10 parts, starch 12 parts, CMC 0.2 parts, lubricant 1.2 parts, and water repellent agent 0.8 parts (the latex is carboxylic styrene-butadiene latex with solid content of 48-52%, the CMC is carboxymethyl cellulose with water content of less than or equal to 10%, the starch is surface sizing starch with water content of less than or equal to 14%, the lubricant is calcium stearate emulsion with solid content of 48-52%, the water repellent agent is polyamide polyurea resin with solid content of 48-52%, the same examples below), and the solid content of the coating is 64%; stirring uniformly, coating the reverse side of the paper sheet entering from the front drying part by a metering rod type surface sizing machine, and controlling the coating weight to be 18g/m2Then, after-drying treatment is carried out, the temperature of a drying cylinder is controlled to be 40-130 ℃, and the dryness of paper sheets of a drying part after the paper sheets are discharged is more than or equal to 93 percent; the paper sheet entering from the post-drying part enters a calendering area, and the calendering treatment is carried out on the paper sheet, wherein the temperature of a calendering hot roller is 50 ℃, and the linear pressure is respectively 10kN/m and 15 kN/m.
After calendering, the paper is reeled to obtain the quantitative 80g/m2And the whiteness is 81.5 percent ISO of the machine-coating color drawing paper. The bulk of the obtained product is 1.28cm3The smoothness is 55s, meanwhile, the surface of the paper is smooth and fine, the overprinting is accurate, the printed patterns are clear, the color is full, the printing effect is good, and the method can be applied to eight-color rotary printing.
An example of eight-color rotary printing is as follows: the printing equipment is 8-color commercial rotary offset press of SYSTEM-38S model manufactured by Korea (KOMORI), the printed sheet specification is 860 × 596mm, the working speed is 36300 printed sheets/hour, and the ink adopts FXB51460 series ink manufactured by Fulingte group company.
FIG. 1 is a comparison chart of a color paper printing sample obtained in example 1, wherein the upper side of the picture is a full wood pulp offset paper printing sample, and the lower side of the picture is a color paper printing sample.
Example 2:
according to 30%, the method comprises the following steps of pulping softwood pulp (275-325 mL), hardwood pulp (350-400 mL) and poplar chemi-mechanical pulp (190-235 mL) with freeness meeting requirements: 40%: mixing the slurry according to the proportion of 30 percent; then 16 percent of calcium carbonate filler is added, and the mixture is sent into a first-stage four-section conical slag remover through a fan pump to be purified and removed, and then enters a degassing tank to be degassed; then the mixture enters a pressure screen for screening treatment (the dosage of cationic PAM is 0.6 kg/ton paper, the dosage of cationic starch is 10 kg/ton paper, the dosage of sizing agent alkyl ketene dimer is 1.5 kg/ton paper is added at the inlet of the pressure screen, and the dosage of bentonite is 2.2 kg/ton paper is added at the outlet of the pressure screen); then feeding the paper into a pulp flowing box to be netted, adjusting the flow rate of netted paper, and controlling the scanned paper ration before sizing to be 60g/m2Left and right; after the wet paper leaves the net part, the wet paper enters a press part for five-roll three-press-area combined pressing, and the wet paper enters a front drying part after being pressed until the dryness is more than or equal to 39%; controlling the surface temperature of the drying cylinder at 90-130 ℃ to dry the paper until the dryness of the paper is more than or equal to 95%; and (4) entering a sizing press for coating surface treatment.
The formula of the coating is as follows: 85 parts of GCC, 15 parts of kaolin, 11 parts of latex, 10 parts of starch, 0.1 part of CMC, 0.6 part of lubricant, 1.0 part of water repellent agent and 64 percent of solid content of coating; stirring uniformly, coating the reverse side of the paper sheet entering from the front drying part by a metering rod type surface sizing machine, and controlling the coating weight to be 20g/m2Then, after-drying treatment is carried out, the temperature of a drying cylinder is controlled to be 40-130 ℃, and the dryness of paper sheets of a drying part after the paper sheets are discharged is more than or equal to 93 percent; the paper sheet entering from the post-drying part enters a calendering area, and the calendering treatment is carried out on the paper sheet, wherein the temperature of a calendering hot roller is 50 ℃, and the linear pressure is respectively 10kN/m and 15 kN/m.
By passing through a pressureAfter polishing, the paper was wound up to obtain a quantitative 80g/m2And the whiteness is 82.2 percent ISO of the machine-coating color drawing paper. The bulk of the obtained product is 1.25cm3And the smoothness is 55s, meanwhile, the surface of the paper is smooth and fine, and when the paper is applied to eight-color rotary printing, the overprinting is accurate, the printed pattern is clear, the color is full, and the printing effect is good (similar to the embodiment 1).
Example 3:
according to 25%, the method comprises the following steps of pulping softwood pulp (275-325 mL), hardwood pulp (350-400 mL) and poplar chemi-mechanical pulp (190-235 mL) with freeness meeting requirements: 40%: preparing slurry according to the proportion of 35 percent; then 16 percent of calcium carbonate filler is added, and the mixture is sent into a first-stage four-section conical slag remover through a fan pump to be purified and removed, and then enters a degassing tank to be degassed; then the mixture enters a pressure screen for screening treatment (the dosage of cationic PAM is 0.6 kg/ton paper, the dosage of cationic starch is 10 kg/ton paper, the dosage of sizing agent alkyl ketene dimer is 1.5 kg/ton paper is added at the inlet of the pressure screen, and bentonite is 2 kg/ton paper is added at the outlet of the pressure screen); then feeding the paper into a head box to be netted, adjusting the flow rate of netted paper, and controlling the scanned paper ration before sizing to be 62g/m2Left and right; after the wet paper leaves the net part, the wet paper enters a press part for five-roll three-press-area combined pressing, and the wet paper enters a front drying part after being pressed until the dryness is more than or equal to 39%; controlling the surface temperature of the drying cylinder at 90-130 ℃ to dry the paper until the dryness of the paper is more than or equal to 95%; and (4) entering a sizing press for coating surface treatment.
The formula of the coating is as follows: 85 parts of GCC, 15 parts of kaolin, 10 parts of latex, 12 parts of starch, 0.2 part of CMC, 1.0 part of lubricant, 1.0 part of water repellent agent and 64 percent of solid content of coating; stirring uniformly, coating the reverse side of the paper sheet entering from the front drying part by a metering rod type surface sizing machine, and controlling the coating weight to be 18g/m2Then, after-drying treatment is carried out, the temperature of a drying cylinder is controlled to be 40-130 ℃, and the dryness of paper sheets of a drying part after the paper sheets are discharged is more than or equal to 93 percent; the paper sheet entering from the post-drying part enters a calendering area, and the calendering treatment is carried out on the paper sheet, wherein the temperature of a calendering hot roller is 50 ℃, and the linear pressure is respectively 10kN/m and 15 kN/m.
After calendering, the paper is reeled to obtain the quantitative 80g/m2Machine coating color drawing paper with whiteness of 82% ISO. The bulk of the obtained product is 1.26cm3The smoothness is 55s, meanwhile, the surface of the paper is smooth and fine, the overprinting is accurate, the printed patterns are clear, the color is full, the printing effect is good, and the method can be applied to eight-color rotary printing.
The embodiment shows that the surface of the base paper is coated in the machine, so that the surface smoothness, the printing performance and the color reduction performance of the color painting paper can be effectively improved, and the ash content of the paper can be greatly improved after coating, thereby reducing the production cost. The product can be applied to eight-color rotary printing, the color printing image is clear and vivid, the color is bright and full, the layering sense is strong, the color is good, and the product is exquisite in printing, widely applied to printing of high-grade books and periodicals, color paintings, color albums, exquisite magazines and the like, is popular with customers and has wide market potential.
The above description is only a preferred embodiment of the present invention, and it should be noted that various modifications to these embodiments can be implemented by those skilled in the art without departing from the technical principle of the present invention, and these modifications should be construed as the scope of the present invention.
Claims (10)
1. A method for manufacturing in-machine coated color drawing paper is characterized by comprising the following steps:
s1, preparing the pulped softwood pulp, hardwood pulp and poplar chemi-mechanical pulp; the weight ratio of the softwood pulp, the hardwood pulp and the poplar chemi-mechanical pulp is 25-30: 30-40: 30-45; the freeness of the beaten softwood pulp is 275-325 mL;
s2, adding auxiliary materials after the pulp is prepared, and making paper to obtain wet paper;
s3, sequentially carrying out pre-drying, in-machine coating, post-drying and calendaring on the wet paper to obtain in-machine coated color drawing paper;
the coating adopted by the coating in the machine comprises the following components in parts by weight: 80-90 parts of GCC, 10-20 parts of kaolin, 9-11 parts of latex, 10-12 parts of starch, 0.1-0.2 part of CMC, 0.5-1.5 parts of lubricant and 0.5-1.5 parts of water repellent agent.
2. The manufacturing method according to claim 1, wherein the freeness of the pulped hardwood pulp is 350 to 400 mL; the freeness of the pulped poplar chemi-mechanical pulp is 190-235 mL.
3. The manufacturing method according to claim 1, wherein the auxiliary materials include alkyl ketene dimer, filler, cationic starch, polyacrylamide and bentonite; the weight ratio of the filler to the oven dry pulp is 15-18%, and the weight ratio of the cationic starch to the oven dry pulp is 0.9-1.1%.
4. The method according to claim 3, wherein the auxiliary material contains 0.1 to 0.3% by weight of the alkyl ketene dimer and the oven dry pulp, 400 to 600ppm by weight of the polyacrylamide and 0.2 to 0.4% by weight of the bentonite and the oven dry pulp.
5. The method of claim 1, wherein the wet basis weight is 59-63g/m2And squeezing until the dryness of the paper is more than or equal to 39%, and then carrying out pre-drying, wherein the temperature of the pre-drying is controlled to be 90-130 ℃, and the paper is coated in a machine when the dryness of the paper is more than or equal to 95%.
6. The manufacturing method according to any one of claims 1 to 5, wherein the solid content of the coating adopted by the machine coating is 60-65%; the coating weight of the coating in the machine is 16-20 g/m2。
7. The manufacturing method according to claim 6, wherein the post-drying temperature is 40-130 ℃ and the calendering treatment is carried out after the sheet dryness is more than or equal to 93%.
8. The on-machine-coated color paper obtained by the production method according to any one of claims 1 to 7, having a basis weight of 80.0 ± 1.0g/m2The whiteness degree ISO 81-83%, the opacity 90-92%,the bulk is more than or equal to 1.25cm3Per g, smoothness is 50-60 s.
9. The machine-interior coated color paper according to claim 8, wherein the moisture content of the machine-interior coated color paper is 5.0-7.0%, and the surface absorption weight is less than or equal to 25g/m2The longitudinal fracture length is more than or equal to 5500m, and the printing surface strength is more than or equal to 1.0 m/s.
10. Use of the machine coated graphic paper according to claim 8 or 9 in colour commercial rotary printing.
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| CN113718556A (en) * | 2021-09-15 | 2021-11-30 | 岳阳林纸股份有限公司 | Coated paper and preparation method thereof |
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| CN102877365A (en) * | 2012-10-22 | 2013-01-16 | 中冶纸业银河有限公司 | Manufacturing method of high-bulk coating printing paper |
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