CN102912691B - Coated craft paper and production method thereof - Google Patents
Coated craft paper and production method thereof Download PDFInfo
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- CN102912691B CN102912691B CN201210395962.2A CN201210395962A CN102912691B CN 102912691 B CN102912691 B CN 102912691B CN 201210395962 A CN201210395962 A CN 201210395962A CN 102912691 B CN102912691 B CN 102912691B
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Landscapes
- Paper (AREA)
Abstract
The invention discloses coated craft paper and a production method thereof. The coated craft paper comprises a core paper layer; the upper side of the core paper layer is a surface paper layer, and the lower side is a bottom paper layer; a coating layer is arranged on the upper surface of the surface paper layer; the bottom paper layer and the core paper layer are prepared by the steps of: dosing the waste paper, preparing waste paper pulp to obtain non-deinked waste paper pulp, and manufacturing paper through a paper layer to obtain a wet bottom paper layer and a wet core paper layer; the surface paper layer is prepared by the steps of: manufacturing paper through a paper layer by taking the UKP pulp, the non-deinked waste paper pulp or the mixture of the UKP pulp and the non-deinked waste paper pulp as the pulp to obtain a wet surface paper layer; and the wet bottom paper layer, the wet core paper layer and the wet surface paper layer are subjected to the steps of compounding with the coated body paper, preliminary drying, sizing, later drying, paper surface calendering, paper surface coating and after-treatment to obtain the coated craft paper. The available waste paper types are increased, and the fiber source is wider; and meanwhile, the quality of the waste paper pulp is effectively stabilized so as to guarantee the quality stability of the coated body paper and the white-surface craft paper and avoid easy layering, splitting and scaling.
Description
Technical Field
The invention relates to a craft paper, in particular to a coated craft paper and a production method thereof, belonging to the technical field of craft paper manufacture.
Background
With the development of national economy, the circulation of various commodities such as electronics, electromechanics, instruments, daily chemicals, clothing and textile and the like is increased, the market demand of the kraft paper serving as the product packaging materials is greatly increased, and higher requirements are provided for the product quality.
The conventional craft paper is generally a single-layer structure manufactured by single-wire forming, and in order to increase the thickness and stiffness thereof to provide better packing performance, the conventional craft paper is gradually developed into a two-layer or multi-layer structure manufactured by double-layer or multi-wire forming and then compounded. At present, most products in the market are of a three-layer paper structure formed by respectively manufacturing paper by three forming nets and then compounding, the strength and the stiffness are improved due to the increase of the thickness of the craft paper, but the problem that the craft paper is broken due to the separation of the cardboard layers in use due to the lower bonding strength of the cardboard layers in the compounding process is often caused.
In order to improve the grade of the kraft liner board product and highlight the appearance and the surface performance, most manufacturers adopt bleached wood pulp or the bleached wood pulp and DIP deinking pulp to be matched for fine dried noodles when producing kraft liner boards with multilayer structures, and white fine dried noodle kraft liner boards are produced. The craft paper obtained by the method is more beautiful than the traditional craft paper, but the application of the bleaching pulp improves the production cost of the craft paper and indirectly increases the commodity circulation cost of the packaged material; meanwhile, because the yield of the fiber is low in the production process of the bleached pulp, a large amount of chemicals are consumed, and a large amount of middle-stage sewage containing harmful substances is discharged, the use of the bleached pulp for fine dried noodles is not favorable for saving primary wood resources and environmental protection, and meanwhile, the chemical substances such as the whitening agent and the like remained in the bleached pulp have adverse effects on packaged goods such as textiles, daily chemicals and the like.
The craft paper is used as an outer package of some high-grade goods, and in order to obtain good printing patterns, a process of coating pigment on the surface of the natural-color or white fine dried craft paper appears in recent years, and the purpose of improving the ink absorbability on the surface of the paper is achieved by improving the smoothness and the porosity of the paper. As shown in fig. 1, in the process, a sizing agent 8 mainly containing starch is generally used to form a sizing layer on the surface of a surface paper layer 2, and then the surface of the sizing layer 8 is coated to obtain a base coat layer 4, a middle coat layer 5 and a surface coat layer 6, and the coating process mostly adopts a blade coating method, and the sizing and coating process has the following problems:
1) surface sizing problems. Whether the doctor blade coating, the air knife coating or the curtain coating is adopted in the subsequent process, in the process of applying glue on the surface of the craft paper, a method which mainly uses starch or starch matched with chemicals such as a surface sizing agent is generally adopted at present, and the aim is to form a starch covering film on the paper surface so as to endow the paper surface with better smoothness and provide better coating conditions for covering the paper surface by a rear coating so as to improve the ink absorptivity; and a starch film is formed on the paper surface, so that the defects of hair and powder falling during subsequent coating are overcome, and the migration of the coating adhesive is slowed down.
In the process, the higher the starch concentration is, the better the film forming property is, but with the increase of the starch paste concentration, in the processes of rapid sizing and rapid drying, although good film forming property is provided, the penetration to the interior of paper is poor, and the interlayer combination of the paper with a multilayer structure is not basically helped, so the starch concentration is generally 8-15%; in addition, although the starch film can endow the paper surface with better smoothness, and is convenient for the application and pigment covering of a subsequent coating process, the starch solid film is brittle, an excessively thick starch sizing layer is easy to break and fall off, a coating layer attached to the surface of the sizing layer is easy to break and fall off, a plate is easy to be pasted during printing, and a peeling phenomenon is generated during serious printing, so that the subsequent surface printing and printing effects are influenced.
2) The coating process is a problem. The craft paper is used as packaging paper, more emphasis is placed on paper strength and fiber length, and the fibers are only subjected to simple pulping and pulping treatment. Especially, the raw paper of the kraft liner made by unbleached pulp has more uneven surface compared with the surface of the coated paper and the white cardboard due to the application of a large amount of unbleached pulp and waste paper pulp which are not subjected to thinning treatment and the multi-layer composite structure of the unbleached pulp and the waste paper pulp. If the subsequent doctor blade coating is adopted, the coating in the material groove is transferred to the surface of the paper web through the rotating roller surface in the doctor blade coating process, the doctor blade directly acts on the surface of the paper web, and the aim of controlling the thickness of the coating on the surface of the paper web and the coating amount on the surface of the paper web is achieved by controlling the angle and the pressure of the doctor blade.
In this process, the following problems arise due to the direct action of the doctor blade on the web surface: firstly, the paper web of the adhesive coating is in the process of high-speed operation, the coating is easier to fill the concave part on the paper web surface by the high-speed cutting force relatively generated by the scraper, and the convex part leaves a very thin coating layer, even the paper web fiber structure is damaged, so even though the paper web is coated twice, three times or more, the residual coating layer on the convex part on the paper web surface is not much, and as a result, the coating on the surface of the craft paper is poor in coverage, the thickness of the coating is uneven, and the uneven thickness of the coating causes the uneven absorption of ink on the paper web, so that the craft is easy to bloom during printing, the colors of the printing patterns are different, and the brightness is different, in addition, the coating layer with uneven thickness on the paper web surface causes the craft paper web to be easy to locally shed in the use process, namely, the phenomena of bubbling and peeling are caused, and the coating generated by the coating of, affecting the use. Secondly, in the coating process, the paper web running with the coating is in a fully wet state, and the scraper directly acts on the surface of the paper web to easily cause paper breakage, thereby influencing the production efficiency of the coating machine.
3) The problem of pigment hiding. Because the surface of the craft paper is rough and uneven, the covering uniformity of the coating pigment on paper surface fibers is always a problem which is difficult to completely solve, and how to enhance the pigment covering as much as possible and improve the uniformity of the coating layer is always a subject of continuous research in the industry. Whether the coating is applied for one time, two times, three times or even more times, the pigment adopted in the coating formula is mainly one or two of ground heavy calcium carbonate and kaolin, and sometimes part of plastic pigment is assisted, or titanium dioxide is added to enhance the pigment covering property and improve the whiteness and the opacity of a paper surface. Although the ground heavy calcium carbonate is low in price, the covering property of the ground heavy calcium carbonate on paper surfaces is poor, the coating effect is poor, the covering property can be further improved by kaolin, but the cost is high, and the plastic pigment and the titanium dioxide can achieve good covering property, opacity and whiteness, but the price is too high, so that the market competitiveness of the craft paper is greatly influenced. Therefore, finding a low-cost alternative pigment with good paper surface coverage and effectively improving the paint formula are important problems to be solved in the production of coated kraft liner paper.
In addition, with the rapid increase of the production scale and the total consumption of paper in China and abroad in recent years, the demand of the paper industry for wood fiber is rapidly increased, and meanwhile, due to the requirement of sustainable development, waste paper becomes an important raw material of the paper industry, and particularly in the field of packaging paper, the waste paper is vigorously advocated and generally popularized by adopting the waste paper as the raw material.
Disclosure of Invention
The invention aims to solve the technical problems, and provides a coated craft paper and a production method thereof, which overcome the defects that the craft paper is easy to be layered, broken and cracked, and the coverage of a paper surface pigment layer and the ink absorbability are not uniform in the prior art.
In order to solve the problems, the invention adopts the following technical scheme: the utility model provides a coating craft paper, includes core paper layer, and core paper layer's upside is surface paper layer, and the downside is bottom paper layer, and surface paper layer's upper surface is equipped with coating layer, its characterized in that: the bottom paper layer and the core paper layer of the coated kraft liner board are prepared by mixing waste paper and preparing waste paper pulp from the waste paper to obtain waste paper pulp which is not deinked, and then the wet bottom paper layer and the wet core paper layer are obtained through the paper layer papermaking step;
the surface paper layer is a wet surface paper layer obtained by using UKP pulp, waste paper pulp which is not deinked or a mixture of the UKP pulp and the waste paper pulp which is not deinked as pulp and papermaking the paper layer;
the wet bottom paper layer, the wet core paper layer and the wet surface paper layer are subjected to coating base paper compounding, front drying, sizing, rear drying, paper surface calendaring, paper surface coating and post-treatment to prepare the coated craft paper.
Based on the coated kraft liner board, the invention provides a production method of the coated kraft liner board, which comprises the steps of waste paper batching, waste paper pulp preparation, papermaking forming, coating base paper compounding, front drying, sizing, rear drying, paper surface calendaring, paper surface coating and post-treatment;
waste paper pulp batching step: and (3) treating waste: and (4) national waste: europe waste: daily waste is 50%: 20%: 15%: fully mixing 15% of the raw materials in percentage by mass, and pulping;
the waste paper used in the waste paper batching step comprises one or a mixture of waste cardboard paper, waste newspaper, waste culture paper and the like.
Preparing waste paper pulp: the waste paper is uniformly mixed according to the proportion, then is crushed and coarsely screened, and then is subjected to fiber classification through a classification screen, so that three fiber pulp materials of long-fiber waste paper pulp, medium-fiber waste paper pulp and short-fiber waste paper pulp are obtained.
An optimized scheme is characterized in that the papermaking forming comprises the steps of papermaking bottom paper layer, papermaking core paper layer and papermaking surface paper layer;
making a bottom paper layer: taking 20-60% of medium fiber waste paper pulp and 40-80% of short fiber waste paper pulp according to mass percentage to prepare slurry, adding filler, dehydrating and forming through a flow system and a net part to prepare a wet bottom paper layer, wherein the quantitative content is 100-2；
Making a core paper layer: taking 50-100% of classified medium-fiber waste paper pulp and 0-50% of classified short-fiber waste paper pulp by mass percent to prepare slurry, adding filler, and carrying out dewatering forming by a flow system and a net part to prepare a wet core paper layer, wherein the quantitative ratio is 20-50g/m2；
Making a surface paper layer by paper making: taking UKP pulp, classified long fiber waste paper pulp or mixture of UKP pulp and classified long fiber waste paper pulp as pulp, adding filler, dewatering and forming by a flow system and a net part to obtain a wet face paper layer with a quantitative of 20-50g/m2。
In another optimization scheme, the coating base paper compounding step comprises the following steps: respectively forming the wet base paper layer, the wet core paper layer and the wet surface paper layer on respective forming nets, entering a paper layer composite area, respectively spraying raw starch between the surface paper layer and the core paper layer and between the core paper layer and the base paper layer, and then pressing to form a composite paper layer;
drying the base paper before: the composite paper layer is pressed and dehydrated, enters a front drying part for drying, and then enters a surface sizing part for sizing;
sizing: adding water into starch to prepare 2-6% suspension, heating and gelatinizing to form starch paste, adding 1-10% of penetrating agent, 1-10% of wet strength agent and 1-10% of paper reinforcing agent into the starch in the oven-dried mass percentage to prepare a surface sizing agent, and sizing paper surface of the dried paper web through a surface sizing machine;
post-drying step: and the kraft liner paper subjected to paper surface sizing enters a rear drying part for drying and drying.
In a further preferred embodiment, the surface calendering step comprises:
and (4) feeding the dried kraft liner paper into a back calendering part, performing hard roller calendering or soft calendering, and then feeding into a coating process for coating.
In the paper surface coating step, pigment and adhesive are prepared into coating, the coating is carried out on the surface of the base paper, and the drying is carried out; the method comprises the following steps of sequentially performing primer coating, intermediate coating and top coating, wherein the coating weight of each layer is as follows: 7-15 g/m of bottom coating25-15 g/m of intermediate coating25-15 g/m of top coating2；
A bottom coating step, a middle coating step and a top coating step: accurately measuring the total amount of the coating in the surface area of the paper, uniformly spraying the coating on the paper surface by a spray coating method, uniformly distributing the coating on the paper surface, carrying out infrared drying and non-contact hot air drying on the paper web, and heating and completely curing and drying the coating layer in a drying cylinder after the coating layer is primarily dried and cured; or
And (3) coating of a base coat and a middle coat: accurately measuring the total amount of the coating in the surface area of the paper, uniformly spraying the coating on the paper surface by a spray coating method, uniformly distributing the coating on the paper surface, carrying out infrared drying and non-contact hot air drying on the paper web, and heating and completely curing and drying the coating layer in a drying cylinder after the coating layer is primarily dried and cured; the coating step of the top coating adopts a scraper coating method, after the coating is uniformly distributed on the paper surface, the paper web is subjected to infrared drying and non-contact hot air drying, and after the coating layer is primarily dried and cured, the coating layer enters a drying cylinder part to be heated and completely cured and dried.
In a further optimized scheme, the post-treatment comprises the following steps of paper surface finishing and reeling:
paper finishing step: after the paper surface coating is finished, the paper enters a paper surface finishing process and is calendered by soft calendering or hard roller calendering;
a coiling step: and after finishing the paper surface, feeding the paper surface into a final reeling part to form a paper roll and slitting to obtain a finished product of the coated craft paper.
The fiber grading is to screen out first-grade good pulp and first-grade slag pulp from the waste paper pulp after coarse screening by first-grade grading, the first-grade slag pulp is subjected to deslagging and re-concentration to obtain short fiber waste paper pulp, the first-grade good pulp is subjected to second-grade grading to screen out second-grade good pulp and second-grade slag pulp, the second-grade slag pulp is subjected to deslagging and re-concentration to obtain medium fiber waste paper pulp, and the second-grade good pulp is subjected to deslagging and re-concentration to obtain long fiber waste paper pulp, wherein the technical indexes are that the freeness of the long fiber waste paper pulp is 500-700CSF, the tensile index is 28-35 N.m/g, and the wet weight is 9-12 g; the freeness of the waste medium fiber pulp is 400-520CSF, the tensile index is 26-31 N.m/g, and the wet weight is 6-7.5 g; the freeness of the short fiber waste paper is 300-420CSF, the tensile index is 23-26 N.m/g, and the wet weight is 2-5 g.
An optimized scheme of the pigment in the paper surface coating step, wherein the pigment in the base coat coating step comprises the following components: according to the absolute dry mass percentage of each component, 60-80% of ground calcium carbonate and 20-40% of precipitated calcium carbonate or 50-70% of ground calcium carbonate, 20-30% of kaolin and 10-20% of precipitated calcium carbonate are matched as pigments, wherein the ground calcium carbonate and the precipitated calcium carbonate account for more than 90% of the pigment with the particle size of less than 2 microns, and the kaolin accounts for more than 86% of the pigment with the particle size of less than 2 microns;
the pigment composition in the middle coating layer coating step is as follows: according to the absolute dry mass percentage of each component, 60-80% of ground calcium carbonate and 20-40% of precipitated calcium carbonate or 50-70% of ground calcium carbonate, 30-50% of kaolin and 0-20% of precipitated calcium carbonate are matched as pigments, wherein the ground calcium carbonate and the precipitated calcium carbonate account for more than 95% of the calcium carbonate with the particle size of less than 2 microns, and the kaolin accounts for more than 95% of the calcium carbonate with the particle size of less than 2 microns;
the pigment composition in the top coating step is as follows: according to the absolute dry mass percentage of each component, 70-100% of ground calcium carbonate and 0-30% of precipitated calcium carbonate or 50-70% of ground calcium carbonate, 30-50% of kaolin and 0-20% of precipitated calcium carbonate are matched as pigments, wherein the ground calcium carbonate and the precipitated calcium carbonate account for more than 95% with the particle size of less than 2 microns, and the kaolin accounts for more than 95% with the particle size of less than 2 microns;
the kaolin is one of superfine kaolin, flaked kaolin and calcined kaolin, and the calcined kaolin is preferably selected.
An optimized scheme of the adhesive in the paper coating step comprises the following components in percentage by weight: the percentage of the oven dry weight of each component to the oven dry weight of the pigment is expressed, wherein the latex is 12 percent, the thickening agent is 1.0 percent, and the caustic soda is 0.06 percent.
The top coating adhesive comprises the following components: the percentage of the oven dry weight of each component to the oven dry weight of the pigment is expressed, wherein, the latex is 12 percent, the thickening agent is 1.0 percent, the caustic soda is 0.06 percent, the lubricating agent is 0.6 to 1.2 percent, the wet strength agent is 0.4 to 1.0 percent, and the dispersing agent is 0.01 to 0.1 percent.
The optimization scheme of the adhesive in the paper coating step is that the latex is synthetic latex or is formed by mixing synthetic latex and biological latex, and the synthetic latex comprises one or a mixture of more of acetic acid latex, styrene-butadiene latex or styrene-acrylic latex or other synthetic latex; the biological latex is a nano starch derivative, namely a biological latex-TM conjugate or a biological polymer conjugate;
the thickening agent comprises one of modified starch, casein, fatty acid ester and CMC;
the lubricant is one of calcium stearate emulsion, petroleum hydrocarbon wax or oxidized polyethylene wax;
the wet strength agent is one of heavy metal salts of calcium, zinc, aluminum and zirconium, amino resin, aldehyde or aldehyde derivatives;
the dispersant is one of polyphosphate, sodium silicate, fatty alcohol, sodium polyacrylate, carboxymethyl cellulose, soybean protein, sodium lignosulfonate, modified starch, gum arabic or casein.
The latex is composed of 50-100% of synthetic latex and 0-50% of biological latex by mass percent.
The optimization scheme of the sizing agent in the sizing step is that the starch is any one of oxidized starch, anionic starch, cationic starch and nonionic starch;
the penetrating agent is any one of fatty alcohol polyoxyethylene ether phosphate, alkyl phosphate and sulfonated succinate;
the wet strength agent comprises any one of urea-formaldehyde resin, melamine formaldehyde resin, polyamide polyurea and polyamide epichlorohydrin resin;
the paper reinforcing agent comprises one of polyacrylate emulsion, carboxymethyl cellulose, polyvinyl alcohol, styrene-maleic anhydride polymer and styrene-acrylate polymer.
By adopting the technical scheme, compared with the prior art, the invention has the following advantages: the mixed waste paper pulp is adopted for pulping, so that the selectable waste paper types are widened, and the fiber source is wider; various waste papers are uniformly mixed and then are pulped, and the quality of the waste paper pulp is effectively stabilized, so that the stability of the quality of the kraft liner coated base paper and the kraft liner paper is ensured.
The fiber pulp adopts waste paper pulp which is not deinked and bleached completely, or the surface paper layer adopts or is matched with a small amount of unbleached chemical pulp, so that the link of using chemicals in the bleaching process is effectively avoided, bleaching sewage discharge does not exist, energy consumption required by bleaching is saved, the energy-saving emission-reducing effect is remarkable, the pulping process is environment-friendly, the fiber yield is high, the cost advantage is obvious, and the market competitiveness of the coated kraft liner is effectively enhanced.
The surface sizing technology breaks through the traditional technology, technical innovation breakthrough is carried out, the surface sizing is enhanced to transfer and permeate to the paper layers, the bonding strength between the paper layers is enhanced, the problems of layering, fault, peeling and the like are not easy to occur, and the application of additives such as wet strength agents in the surface sizing replaces the addition of the additives in the wet part, so that the bonding strength between the paperboard layers and the water resistance, the water resistance and the paper surface strength of the paperboard are enhanced, the hair and powder falling are reduced, the subsequent coating operation is convenient, the loss caused by adding chemicals in a wet part system is avoided, and the use efficiency of the chemicals is improved.
The coating formula is technically innovative, and a large amount of cheap and easily-obtained precipitated calcium carbonate is adopted, so that the waste in the chemical industry is changed into valuable, the environment-friendly effect is strong, and secondly, the particle size uniformity and the shape of the precipitated calcium carbonate are easier to control than those of ground calcium carbonate, and the precipitated calcium carbonate has a better light scattering coefficient and a good ink absorptivity than the ground calcium carbonate, so that the application of the precipitated calcium carbonate greatly improves the opacity of paper, improves the coating covering effect, and has better printability on the coated surface.
The front end of the coating is accurately metered, then the coating is directly and uniformly sprayed on the paper surface, and the coating is naturally leveled on the paper surface by virtue of the high-speed running acting force of the paper and the action of the coating fluid, so that a uniform and continuous coating layer which is more excellent than the coating of a scraper is obtained.
The coating adhesive uses biological latex to replace part of synthetic latex, greatly reduces the production cost of the coated kraft liner, enhances the market competitiveness of the product, and meanwhile, the replacement of the synthetic latex effectively saves petrochemical products and resources.
The invention is further illustrated by the following figures and examples.
Drawings
FIG. 1 is a schematic cross-sectional structure of a craft paper coating layer coated by a scraper in the prior art;
FIG. 2 is a schematic view of the layered structure of a coated craft paper in accordance with an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a coating layer after two spray coatings and one blade coating in an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of the coating layer after three spray applications of the coated craft paper of the present invention;
in the figure, the position of the upper end of the main shaft,
1-core paper layer; 2-a face paper layer; 3-a base paper layer; 4-a base coat; 5-middle coating; 6-top coating; 7-surface glue particles; 8-sizing layer.
Detailed Description
The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is in no way intended to limit the invention; all percentages used in the present invention are mass percentages unless otherwise indicated.
Example 1, as shown in fig. 2, a coated craft paper comprises a core paper layer 1, a surface paper layer 2 is arranged on the upper side of the core paper layer, a base paper layer 3 is arranged on the lower side of the core paper layer, and three coating layers, namely a bottom coating layer 4, a middle coating layer 5 and a top coating layer 6 are arranged on the upper surface of the surface paper layer 2 in sequence from bottom to top.
The production method of the coated kraft liner board comprises the following steps: waste paper batching, waste paper pulp preparation, papermaking forming, raw paper coating and compounding, front drying, sizing, rear drying, paper surface press polishing, paper surface coating and post-treatment; wherein,
1. waste paper burdening: in order to solve the problems of multiple sources and disordered quality of waste paper in large-scale production, American waste, national waste, European waste and daily waste are fully mixed in advance according to the mass ratio of 50: 20: 15%, and then pulping is carried out, so that the uniform mixing of various waste papers widens the source of raw materials, ensures the stable quality of waste paper pulp, and also ensures the stability of the quality of the kraft liner paper. The proportion of the waste paper fibers is a typical proportion combining market supply and demand and quality, and any one or more than two of the waste paper fibers can be adopted in production.
2. Preparing waste paper pulp: the waste paper is uniformly mixed according to the proportion, then is crushed and coarsely screened, and then is subjected to fiber classification through a classification screen, so that three fiber pulp materials of long-fiber waste paper pulp, medium-fiber waste paper pulp and short-fiber waste paper pulp are obtained.
Wherein the fiber is classified as: screening first-stage good pulp and first-stage slag pulp from the waste paper pulp after coarse screening by first-stage classification, deslagging and concentrating the first-stage slag pulp to obtain short-fiber waste paper pulp, screening second-stage good pulp and second-stage slag pulp from the first-stage good pulp by second-stage classification, deslagging and concentrating the second-stage slag pulp to obtain medium-fiber waste paper pulp, deslagging and concentrating the second-stage good pulp to obtain long-fiber waste paper pulp, wherein the technical indexes of the long-fiber waste paper pulp include the freeness of 500-700CSF, the tensile index of 28-35 N.m/g and the wet weight of 9-12 g; the freeness of the waste medium fiber pulp is 400-520CSF, the tensile index is 26-31 N.m/g, and the wet weight is 6-7.5 g; the freeness of the short fiber waste paper is 300-420CSF, the tensile index is 23-26 N.m/g, and the wet weight is 2-5 g.
3. The paper making and forming comprises a paper making bottom paper layer, a paper making core paper layer and a paper making surface paper layer
3.1 papermaking of a bottom paper layer: preparing 20 percent of medium-fiber waste paper pulp and 80 percent of short-fiber waste paper pulp into pulp by mass percent, adding a retention aid, a sizing agent, a dye and starch as fillers, dehydrating and forming by a flow system and a net part to prepare a wet bottom paper layer, and quantifying 130g/m2；
3.2 making a core paper layer by paper making: taking 50 percent of classified medium-fiber waste paper pulp and 50 percent of classified short-fiber waste paper pulp according to mass percent to prepare slurry, adding a retention aid, a sizing agent, a dye and starch as fillers, dehydrating and forming through a flow system and a net part to prepare a wet core paper layer, and quantifying 30g/m2；
3.3 making a surface paper layer: taking 100 percent of the classified long fiber waste paper pulp as slurry, adding retention aid, sizing agent, dye and starch as fillers, dehydrating and forming by a flow system and a net part to prepare a wet surface paper layer,quantitative determination of 30g/m2；
4. Compounding coated base paper, pre-drying, gluing and post-drying
4.1 coating base paper compounding: respectively forming the wet base paper layer, the wet core paper layer and the wet surface paper layer on respective forming nets, entering a paper layer composite area, respectively spraying raw starch between the surface paper layer and the core paper layer and between the core paper layer and the base paper layer, and then pressing to form a composite paper layer, namely coating base paper;
4.2 drying the base paper: the composite paper layer is pressed and dehydrated, enters a front drying part for drying, and then enters a surface sizing part;
4.3 sizing: adding water into starch to prepare 5% turbid liquid, heating and pasting to form starch paste, adding 6% of penetrating agent, 2% of wet strength agent and 10% of paper reinforcing agent into the starch according to the mass percentage of the starch to the mass of the starch to be completely dried, preparing a surface sizing agent, and sizing the paper web dried before delivery by a surface sizing machine, wherein the starch is oxidized starch, the penetrating agent is fatty alcohol polyoxyethylene ether phosphate, the wet strength agent is urea resin, and the paper reinforcing agent is polyacrylate emulsion.
The surface sizing of the invention is substantially different from the traditional surface sizing technology, and the traditional surface sizing aims at forming starch films on paper surfaces as much as possible, improving the smoothness of the paper surfaces, enhancing the strength of the paper surfaces and reducing fiber shedding and hair falling. Because the surface glue concentration is lower in the technical scheme of the invention, and under the action of the penetrant, the surface sizing solution can not form a film shape on the paper surface, but can quickly penetrate through the paper surface to enter the deep layer of the paper web, as shown in figure 2, a large number of surface glue particles 7 are filled in gaps of a paper fiber frame, so that the surface sizing agent has the advantages of traditional surface sizing, the starch paste is convenient to flow by mastering the lower concentration, and is further assisted by the penetrant and not limited to the film forming of the paper surface of the starch paste, but the penetration of the starch paste liquid to the inner part of the paper and the paper layers is promoted to the utmost extent, the base paper strength and the bonding force among the layers are greatly enhanced, and the; in addition, through adding the wet strength agent to starch paste, the sizing material granule of reserving between the paper face fibre frame is more relatively, effectively avoids the paper face to fall mao to fall whitewashed, has both given the wet strength function of kraft liner paper, prevents that the packing material from drenching the damage and leading to by the packing material impaired, has also avoided wet strength agent to add at paper machine approach system and has caused the loss among the traditional papermaking technology, has greatly improved the utilization efficiency of wet strength agent.
4.4 post-drying: drying and drying the kraft liner paper subjected to paper surface sizing in a rear drying part;
5. surface calendering
The dried raw cow cardboard enters a rear calendaring part for calendaring and finishing the paper surface, so that the paper surface is smoother and flatter, the subsequent coating operation is facilitated, the covering of pigment is enhanced, the calendaring of the paper surface can adopt hard roller calendaring or soft calendaring, and the finished cow cardboard enters a coating process for coating;
6. paper coating
The process comprises the steps of preparing a coating from a pigment and an adhesive, coating the surface of base paper, and drying, wherein the coating comprises a bottom coating, a middle coating and a top coating.
6.1 primer coating:
the pigment comprises the following components: according to the absolute dry mass percentage of each component, 70 percent of ground calcium carbonate and 30 percent of precipitated calcium carbonate are matched as pigment, wherein the ground calcium carbonate and the precipitated calcium carbonate account for more than 90 percent of the pigment with the particle size of less than 2 microns.
The adhesive comprises the following components: expressed as a percentage of the oven dry weight of each component to the oven dry weight of the pigment, where latex 12%, thickener 1.0% and caustic 0.06%; the latex is 100 percent of carboxylic styrene-butadiene latex, and the thickening agent is CMC.
And (3) coating of a base coat: accurate metering of the total amount of coating in the surface area of the paper by the front end of 10g/m2(calculated by the mass of the oven-dried coating in unit surface area of the paper), then the coating is uniformly sprayed on the paper surface by a spray coating method, the coating naturally levels on the paper surface by the acting force of the paper web running at high speed and the fluidity of the coating,the spray coating method can be curtain coating, air knife coating or other similar methods, after the coating is uniformly distributed on the paper surface, the paper web is dried by infrared drying and non-contact hot air drying to make the coating layer be primarily dried and solidified, then the paper web is heated in a drying cylinder to be completely solidified and dried, and finally the paper web is subjected to a middle coating process.
6.2 coat application
The pigment comprises the following components: according to the absolute dry mass percentage of each component, 70 percent of ground calcium carbonate and 30 percent of precipitated calcium carbonate are matched as pigment, wherein the ground calcium carbonate and the precipitated calcium carbonate account for more than 95 percent of the pigment with the particle size of less than 2 microns.
The adhesive comprises the following components: the percentage of the oven dry weight of each component to the oven dry weight of the pigment is expressed, wherein the latex is 12 percent, the thickening agent is 1.0 percent, the caustic soda is 0.06 percent, the latex is 100 percent carboxylic styrene butadiene latex, and the thickening agent is CMC.
The method for coating the intermediate coating comprises the following steps: coating amount 8g/m2The method for applying the intermediate coating is the same as the step for applying the base coating.
6.3 Top coat application
The pigment comprises the following components: according to the absolute dry mass percentage of each component, 80 percent of ground calcium carbonate and 20 percent of precipitated calcium carbonate are matched as pigment, wherein the ground calcium carbonate and the precipitated calcium carbonate account for more than 95 percent of the pigment with the particle size of less than 2 microns.
The adhesive comprises the following components: expressed as the percentage of the oven dry weight of each component to the oven dry weight of the pigment, wherein the latex is 12 percent, the thickening agent is 1.0 percent, the caustic soda is 0.06 percent, the lubricating agent is 0.6 percent, the wet strength agent is 1.0 percent, and the dispersing agent is 0.01 percent; the latex is 100 percent of carboxylic styrene-butadiene latex, the thickening agent is CMC, the lubricating agent is calcium stearate emulsion, the wet strength agent is amino resin, and the dispersing agent is carboxymethyl cellulose.
The coating method of the top coating comprises the following steps: the coating weight is controlled to be 12g/m2The top coating can be applied by the same method as the bottom coating and the middle coating, namely a natural leveling method of metering and spraying the coating on the paper surface so as to further strengthenHiding of the pigment on the paper surface, as shown in fig. 4; the blade coating method can also be used to achieve a smoother paper surface, and as shown in fig. 3, the specific method adopted in the production depends on whether the paper surface pigment hiding property or the paper surface smoothness is emphasized.
7. Post-treatment, including paper finishing and winding
7.1 paper finishing: after the third coating process is finished, the paper enters a paper surface finishing process, and is calendered by soft calendering or hard roller calendering, so that the paper surface is smoother, the thickness is more uniform, and the printability of the paper is enhanced;
7.2 coiling: and after finishing the paper surface, feeding the paper surface into a final reeling part to form a paper roll and slitting to obtain a finished product of the coated craft paper.
Example 2, the process was the same as in example 1 except that the following was different from example 1: in the step of making the bottom paper layer, 60% of medium-fiber waste paper pulp and 40% of short-fiber waste paper pulp; in the step of making the core paper layer, the medium-fiber waste paper pulp is 100 percent; in the step of manufacturing the surface paper layer by using a papermaking method, UKP (unbleached pulp) is adopted, namely 100 percent of unbleached wood pulp is adopted; in the sizing step, the concentration of the starch paste is 3 percent, and the amounts of the penetrating agent, the wet strength agent and the paper strengthening agent to the starch are respectively 2 percent, 8 percent and 2 percent; the latex in the steps of bottom coating, middle coating and top coating consists of 80 percent of carboxylic styrene-butadiene latex and 20 percent of biological latex; the adhesive composition in the top coating step is as follows: 12% of latex, 1.0% of thickening agent, 0.06% of caustic soda, 0.7% of lubricant, 0.9% of wet strength agent and 0.02% of dispersing agent.
Example 3, the process was the same as example 1 except for the following differences from example 1: in the step of making the bottom paper layer, 40% of medium-fiber waste paper pulp and 60% of short-fiber waste paper pulp; in the step of making the core paper layer, 70% of medium-fiber waste paper pulp and 30% of short-fiber waste paper pulp; in the step of manufacturing the surface paper layer, 30 percent of long-fiber waste paper pulp and 70 percent of UKP pulp; in the sizing step, the concentration of the starch paste is 4 percent, and the amounts of the penetrating agent, the wet strength agent and the paper strengthening agent to the starch are 5 percent, 5 percent and 5 percent respectively; the latex in the steps of bottom coating, middle coating and top coating consists of 60 percent of carboxylic styrene-butadiene latex and 40 percent of biological latex; the adhesive composition in the top coating step is as follows: 12% of latex, 1.0% of thickening agent, 0.06% of caustic soda, 0.8% of lubricant, 0.8% of wet strength agent and 0.03% of dispersing agent.
Example 4, the process was the same as in example 1 except that the following was different from example 1: in the step of making the bottom paper layer, 50% of medium-fiber waste paper pulp and 50% of short-fiber waste paper pulp; in the step of making the core paper layer, 60 percent of medium-fiber waste paper pulp and 40 percent of short-fiber waste paper pulp; in the step of manufacturing the surface paper layer, 50% of long-fiber waste paper pulp and 50% of UKP pulp are used; in the sizing step, the concentration of the starch paste is 5%, and the amounts of the penetrating agent, the wet strength agent and the paper strengthening agent to the starch are respectively 4%, 10% and 7%; the latex in the steps of bottom coating, middle coating and top coating consists of 50 percent of carboxylic styrene-butadiene latex and 50 percent of biological latex; the adhesive composition in the top coating step is as follows: 12% of latex, 1.0% of thickening agent, 0.06% of caustic soda, 0.9% of lubricant, 0.7% of wet strength agent and 0.04% of dispersing agent.
Example 5 the process was the same as in example 1 except that the following was different from example 1: in the step of making the bottom paper layer, 30% of medium-fiber waste paper pulp and 70% of short-fiber waste paper pulp; in the step of making the core paper layer, 80% of medium-fiber waste paper pulp and 20% of short-fiber waste paper pulp; in the step of manufacturing the surface paper layer, 30 percent of long-fiber waste paper pulp and 70 percent of UKP pulp; in the sizing step, the concentration of the starch paste is 2 percent, and the amounts of the penetrating agent, the wet strength agent and the paper strengthening agent to the starch are respectively 10 percent, 6 percent and 4 percent; the latex in the steps of bottom coating, middle coating and top coating consists of 50 percent of carboxylic styrene-butadiene latex and 50 percent of biological latex, and the pigment in the step of bottom coating comprises the following components: 80% of ground calcium carbonate and 20% of precipitated calcium carbonate; in the middle coating layer coating step, the pigment composition is as follows: 80% of ground calcium carbonate and 20% of precipitated calcium carbonate; in the step of coating the top coating, the pigment composition is as follows: 100% of ground calcium carbonate; the adhesive composition in the top coating step is as follows: 12% of latex, 1.0% of thickening agent, 0.06% of caustic soda, 1.0% of lubricant, 0.6% of wet strength agent and 0.05% of dispersing agent.
Example 6, the process was the same as example 1 except for the following differences from example 1: in the undercoat layer coating step, the pigment composition: 60% of ground calcium carbonate and 40% of precipitated calcium carbonate; in the middle coating layer coating step, the pigment composition is as follows: 60% of ground calcium carbonate and 40% of precipitated calcium carbonate; in the step of coating the top coating, the pigment composition is as follows: 70% of ground calcium carbonate and 30% of precipitated calcium carbonate; the adhesive composition in the top coating step is as follows: 12% of latex, 1.0% of thickening agent, 0.06% of caustic soda, 1.1% of lubricant, 0.5% of wet strength agent and 0.06% of dispersing agent.
Example 7, the process was the same as example 1 except for the following differences from example 1: in the undercoat layer coating step, the pigment composition: 80% of ground calcium carbonate and 20% of precipitated calcium carbonate; in the middle coating layer coating step, the pigment composition is as follows: 80% of ground calcium carbonate and 20% of precipitated calcium carbonate; in the step of coating the top coating, the pigment composition is as follows: 100% of ground calcium carbonate; the latex in the primary coating, the middle coating and the surface coating consists of 50 percent of carboxylic styrene-butadiene latex and 50 percent of biological latex; the adhesive composition in the top coating step is as follows: 12% of latex, 1.0% of thickening agent, 0.06% of caustic soda, 1.2% of lubricant, 0.4% of wet strength agent and 0.07% of dispersing agent.
Example 8, the process was the same as example 1 except for the following differences from example 1: sizing
In the step, the concentration of the starch paste is 4%, and the mass percentages of the penetrating agent, the wet strength agent and the paper strengthening agent to the starch are 5%, 5% and 5% respectively; in the undercoat layer coating step, the pigment composition: 60% of ground calcium carbonate and 40% of precipitated calcium carbonate; in the middle coating layer coating step, the pigment composition is as follows: 60% of ground calcium carbonate and 40% of precipitated calcium carbonate; in the step of coating the top coating, the pigment composition is as follows: 70% of ground calcium carbonate and 30% of precipitated calcium carbonate; the latex in the primary coating, the middle coating and the surface coating consists of 60 percent of carboxylic styrene-butadiene latex and 40 percent of biological latex; the adhesive composition in the top coating step is as follows: 12% of latex, 1.0% of thickening agent, 0.06% of caustic soda, 0.6% of lubricant, 0.5% of wet strength agent and 0.08% of dispersing agent.
Example 9, the process was the same as example 1 except for the following differences from example 1: in the undercoat layer coating step, the pigment composition: 70% of ground calcium carbonate, 20% of kaolin and 10% of precipitated calcium carbonate; in the middle coating layer coating step, the pigment composition is as follows: 50% of ground calcium carbonate, 30% of kaolin and 20% of precipitated calcium carbonate; in the step of coating the top coating, the pigment composition is as follows: 50% of ground calcium carbonate, 30% of kaolin, 20% of precipitated calcium carbonate and calcined kaolin selected from kaolin; the adhesive composition in the top coating step is as follows: 12% of latex, 1.0% of thickening agent, 0.06% of caustic soda, 0.7% of lubricant, 0.6% of wet strength agent and 0.09% of dispersant, wherein the content of kaolin with the particle size of less than 2 microns in the step of coating the base coat accounts for more than 86%, and the content of kaolin with the particle size of less than 2 microns in the kaolin accounts for more than 95%.
Example 10, the process was the same as example 5 except that the following differences from example 5 were present: in the undercoat layer coating step, the pigment composition: 65% of ground calcium carbonate, 20% of kaolin and 15% of precipitated calcium carbonate; in the middle coating layer coating step, the pigment composition is as follows: 50% of ground calcium carbonate and 50% of kaolin; in the step of coating the top coating, the pigment composition is as follows: ground calcium carbonate 50%, kaolin 50%, preferably calcined kaolin; the adhesive composition in the top coating step is as follows: 12% of latex, 1.0% of thickening agent, 0.06% of caustic soda, 0.8% of lubricant, 0.7% of wet strength agent and 0.1% of dispersant, wherein the content of kaolin with the particle size of less than 2 microns in the step of coating the base coat accounts for more than 86%, and the content of kaolin with the particle size of less than 2 microns in the kaolin accounts for more than 95%.
Example 11, the process was the same as example 6 except that the following differences from example 6 were present: in the undercoat layer coating step, the pigment composition: 60% of ground calcium carbonate, 25% of kaolin and 15% of precipitated calcium carbonate; in the middle coating layer coating step, the pigment composition is as follows: 60% of ground calcium carbonate, 30% of kaolin and 10% of precipitated calcium carbonate; in the step of coating the top coating, the pigment composition is as follows: 60% of ground calcium carbonate, 30% of kaolin, 10% of precipitated calcium carbonate and preferably calcined kaolin; the adhesive composition in the top coating step is as follows: 12% of latex, 1.0% of thickening agent, 0.06% of caustic soda, 0.9% of lubricant, 0.8% of wet strength agent and 0.11% of dispersant, wherein the content of kaolin with the particle size of less than 2 microns in the coating step of the base coat is more than 86%, and the content of kaolin with the particle size of less than 2 microns in the kaolin is more than 95%.
Example 12, the process was the same as example 7 except that the following differences from example 7 were present: sizing
In the step, the concentration of the starch paste is 4%, and the mass percentages of the penetrating agent, the wet strength agent and the paper strengthening agent to the starch are 5%, 5% and 5% respectively; in the undercoat layer coating step, the pigment composition: 55% of ground calcium carbonate, 20% of kaolin and 15% of precipitated calcium carbonate; in the middle coating layer coating step, the pigment composition is as follows: 65% of ground calcium carbonate, 30% of kaolin and 5% of precipitated calcium carbonate; in the step of coating the top coating, the pigment composition is as follows: 50% of ground calcium carbonate, 30% of kaolin and 20% of precipitated calcium carbonate; the latex in the primary coating, the middle coating and the surface coating consists of 80 percent of carboxylic styrene-butadiene latex and 20 percent of biological latex, and the kaolin is preferably calcined kaolin; the adhesive composition in the top coating step is as follows: 12% of latex, 1.0% of thickening agent, 0.06% of caustic soda, 1.0% of lubricant, 0.9% of wet strength agent and 0.12% of dispersant, wherein the content of kaolin with the particle size of less than 2 microns in the coating step of the base coat is more than 86%, and the content of kaolin with the particle size of less than 2 microns in the kaolin is more than 95%.
Example 13, the process was the same as example 8 except that the following differences from example 8 were present: in the undercoat layer coating step, the pigment composition: 50% of ground calcium carbonate, 30% of kaolin and 20% of precipitated calcium carbonate; in the middle coating layer coating step, the pigment composition is as follows: 60% of ground calcium carbonate, 30% of kaolin and 10% of precipitated calcium carbonate; in the step of coating the top coating, the pigment composition is as follows: 50% of ground calcium carbonate, 50% of kaolin, and calcined kaolin selected from kaolin; the adhesive composition in the top coating step is as follows: 12% of latex, 1.0% of thickening agent, 0.06% of caustic soda, 1.2% of lubricant, 1% of wet strength agent and 0.01% of dispersant, wherein the content of kaolin with the particle size of less than 2 microns in the step of coating the base coat accounts for more than 86%, and the content of kaolin with the particle size of less than 2 microns in the kaolin accounts for more than 95%.
In the above embodiments, the above-described embodiments,
the waste paper used in the waste paper batching step comprises one or a mixture of waste cardboard paper, waste newspaper, waste culture paper and the like.
The starch in the sizing step may be any one of anionic starch, cationic starch and nonionic starch.
The penetrating agent is a surfactant, and can also be any one of alkyl phosphate and sulfonated succinate or similar compounds.
The wet strength agent may also be any of melamine formaldehyde resin, polyamide polyurea, polyamide epichlorohydrin resin or similar compound.
The paper reinforcing agent can also be one of carboxymethyl cellulose, polyvinyl alcohol, styrene-maleic anhydride polymer and styrene-acrylate polymer.
The synthetic latex in the paper coating step can also be one or a mixture of more of acetic acid latex, styrene-acrylic latex and other synthetic latexes, and the biological latex is a nano starch derivative and is also called biological latex-TM conjugate or biological polymer conjugate.
The thickener may also be starch, or other chemical synthetic thickeners.
The lubricant may be one of petroleum hydrocarbon wax and oxidized polyethylene wax.
The wet strength agent can also be one of heavy metal salts of calcium, zinc, aluminum, zirconium and the like, aldehyde or aldehyde derivatives.
The dispersant may also be one of polyphosphate, sodium silicate, fatty alcohol, sodium polyacrylate, soybean protein, sodium lignosulfonate, modified starch, gum arabic, and casein.
The kaolin can also be one of superfine kaolin and peeled kaolin.
The coated kraft paper obtained in the above examples was subjected to quality inspection according to ISO standard detection method, and the detection data of examples 1 to 7 are as follows:
the test data for examples 8 to 13 are given in the following table:
as can be seen from comparison of the detection data of the above-mentioned embodiment with GB/T10335.5-2008, the coated craft paper obtained by the method of the invention has high burst index and transverse ring crush index, good interlayer bonding force, and is not easy to break and delaminate; the paper surface pigment layer is well covered, the ink absorption is uniform, the paper surface smoothness is good, the printing surface roughness is low, the printing surface strength is high, the product is not easy to crack and fall off, and the printability is good; the water absorption of the front side and the back side is low, the water resistance of the product is excellent, and the market competitiveness is strong.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A coated craft paper, characterized in that: the coated craft paper comprises a core paper layer (1), wherein the upper side of the core paper layer is a surface paper layer (2), the lower side of the core paper layer is a bottom paper layer (3), the upper surface of the surface paper layer (2) is provided with three coating layers, and a bottom coating (4), a middle coating (5) and a top coating (6) are sequentially arranged from bottom to top;
the production method of the coated kraft liner board comprises the following steps: waste paper batching, waste paper pulp preparation, papermaking forming, raw paper coating and compounding, front drying, sizing, rear drying, paper surface press polishing, paper surface coating and post-treatment; wherein,
waste paper burdening: in order to solve the problems of rich waste paper source and disordered quality in large-scale production, American waste, European waste and daily waste are fully mixed according to the mass ratio of 50: 20: 15, and then pulping is carried out;
preparing waste paper pulp: uniformly mixing the waste paper according to the proportion, performing disintegration and coarse screening, and performing fiber classification through a classifying screen to obtain three fiber pulp materials, namely long-fiber waste paper pulp, medium-fiber waste paper pulp and short-fiber waste paper pulp;
papermaking and forming, including papermaking bottom paper layer, papermaking core paper layer and papermaking surface paper layer:
making a bottom paper layer by paper making: preparing 60% of medium-fiber waste paper pulp and 40% of short-fiber waste paper pulp into slurry by mass percent, adding a retention aid, a sizing agent, a dye and starch as fillers, performing dewatering forming through a flow system and a net part to prepare a wet bottom paper layer, and quantifying 130g/m2；
Making a core paper layer: taking 100 percent of the classified medium-fiber waste paper pulp by mass percent to prepare pulp, adding a retention aid, a sizing agent, a dye and starch as fillers, dehydrating and forming by a flow system and a net part to prepare a wet core paper layer, and quantifying 30g/m2；
Manufacturing a surface paper layer by paper making: taking UKP (unbleached wood pulp) 100% as pulp, adding retention aid, sizing agent, dye and starch as filler, dehydrating and forming by a flow system and a net part to obtain a wet surface paper layer, and quantifying to 30g/m2；
Coating base paper compounding, front drying, sizing and rear drying:
coating base paper compounding: respectively forming the wet base paper layer, the wet core paper layer and the wet surface paper layer on respective forming nets, entering a paper layer composite area, respectively spraying raw starch between the surface paper layer and the core paper layer and between the core paper layer and the base paper layer, and then pressing to form a composite paper layer, namely coating base paper;
drying the base paper before: the composite paper layer is pressed and dehydrated, enters a front drying part for drying, and then enters a surface sizing part;
sizing: adding water into starch to prepare 3% suspension, heating and pasting to form starch paste, adding 2% of penetrating agent, 8% of wet strength agent and 2% of paper reinforcing agent into the starch according to the mass percentage of the starch to the absolute dry mass to prepare a surface sizing agent, and performing paper sizing on the dried paper web before delivery by a surface sizing machine, wherein the starch is oxidized starch, the penetrating agent is fatty alcohol polyoxyethylene ether phosphate, the wet strength agent is urea resin, and the paper reinforcing agent is polyacrylate emulsion;
and (3) post-drying: drying and drying the kraft liner paper subjected to paper surface sizing in a rear drying part;
surface calendering:
the dried raw cow cardboard enters a rear calendaring part for calendaring and finishing the paper surface, so that the paper surface is smoother and flatter, the subsequent coating operation is facilitated, the covering of pigment is enhanced, the calendaring of the paper surface can adopt hard roller calendaring or soft calendaring, and the finished cow cardboard enters a coating process for coating;
paper coating:
preparing a coating from a pigment and an adhesive, coating the surface of base paper, and drying, wherein the coating comprises a bottom coating, a middle coating and a top coating;
and (3) coating of a base coat:
the pigment comprises the following components: according to the absolute dry mass percentage of each component, 70 percent of ground calcium carbonate and 30 percent of precipitated calcium carbonate are matched as pigment, wherein the ground calcium carbonate and the precipitated calcium carbonate account for more than 90 percent of the pigment with the particle size of less than 2 microns;
the adhesive comprises the following components: expressed as a percentage of the oven dry weight of each component to the oven dry weight of the pigment, where latex 12%, thickener 1.0% and caustic 0.06%; the latex consists of 80 percent of carboxylic styrene-butadiene latex and 20 percent of biological latex, and the thickening agent is CMC;
and (3) coating of a base coat: accurate metering of the total amount of coating in the surface area of the paper by the front end of 10g/m2Then the coating is uniformly sprayed on the paper surface by a spray coating method, the coating is naturally leveled on the paper surface by the action force of the paper web running along with the paper machine and the fluidity of the coating, a coating layer with uniform thickness is obtained, the covering property of the pigment on the paper surface is enhanced, the spray coating method can be curtain coating, air knife coating or other similar methods, after the coating is uniformly distributed on the paper surface, the paper web enters infrared drying and non-contact hot air drying, so that the coating layer is preliminarily driedDrying and curing, then putting into a drying cylinder part for heating and completely curing and drying, and then entering into an intermediate coating process;
coating of the intermediate coating:
the pigment comprises the following components: according to the absolute dry mass percentage of each component, 70 percent of ground calcium carbonate and 30 percent of precipitated calcium carbonate are matched as pigment, wherein the ground calcium carbonate and the precipitated calcium carbonate account for more than 95 percent of the pigment with the particle size of less than 2 microns;
the adhesive comprises the following components: the percentage of the oven dry weight of each component to the oven dry weight of the pigment is expressed, wherein the latex is 12 percent, the thickening agent is 1.0 percent and the caustic soda is 0.06 percent, the latex consists of 80 percent of carboxylic styrene-butadiene latex and 20 percent of biological latex, and the thickening agent is CMC;
the method for coating the intermediate coating comprises the following steps: coating amount 8g/m2The middle coating layer is coated by the same method as the coating step of the bottom coating layer;
coating of a top coating:
the pigment comprises the following components: according to the absolute dry mass percentage of each component, 80 percent of ground calcium carbonate and 20 percent of precipitated calcium carbonate are matched as pigment, wherein the ground calcium carbonate and the precipitated calcium carbonate account for more than 95 percent of the pigment with the particle size of less than 2 microns;
the adhesive comprises the following components: expressed as the percentage of the oven dry weight of each component to the oven dry weight of the pigment, wherein the latex is 12 percent, the thickening agent is 1.0 percent, the caustic soda is 0.06 percent, the lubricating agent is 0.7 percent, the wet strength agent is 0.9 percent, and the dispersing agent is 0.02 percent; the latex consists of 80 percent of carboxylic styrene-butadiene latex and 20 percent of biological latex, the thickening agent is CMC, the lubricating agent is calcium stearate emulsion, the wet strength agent is amino resin, and the dispersing agent is carboxymethyl cellulose;
the coating method of the top coating comprises the following steps: the coating weight is controlled to be 12g/m2The coating method of the top coating can be the same as that of the bottom coating and the middle coating, namely, a natural leveling method of metering and spraying paint to the paper surface is adopted to further enhance the covering property of the pigment to the paper surface;
post-treatment, including paper finishing and reeling:
paper finishing: after the third coating process is finished, the paper enters a paper surface finishing process, and is calendered by soft calendering or hard roller calendering, so that the paper surface is smoother, the thickness is more uniform, and the printability of the paper is enhanced;
coiling: after finishing the paper surface, entering a final reeling part to form a paper roll and cutting to obtain a finished product of the coated kraft liner board;
quantitative 220g/m2(ii) a Bulk 1.45cm2(ii)/g; the transverse folding resistance is 95 times; burst index of 3.8kPa · m2(ii)/g; the transverse ring pressure index is 17 N.m/g; interlayer bonding force 205J/m2(ii) a The glossiness is 72%; smoothness 155 s; the front surface roughness is 1.35 mu m; the printing surface strength IGT is 3.6 m/s; k&The N value is 22%; COBB value of 20g/m2(ii) a COBB value of 53g/m2。
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| CN107476134A (en) * | 2017-08-01 | 2017-12-15 | 常州欧康铭化工有限公司 | A kind of kraft inner paper |
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