CN114717875A - Coated paper for rotary press printing and preparation method thereof - Google Patents

Coated paper for rotary press printing and preparation method thereof Download PDF

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Publication number
CN114717875A
CN114717875A CN202110014514.2A CN202110014514A CN114717875A CN 114717875 A CN114717875 A CN 114717875A CN 202110014514 A CN202110014514 A CN 202110014514A CN 114717875 A CN114717875 A CN 114717875A
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calcium carbonate
layer
adhesive
rotary press
coated paper
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CN202110014514.2A
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CN114717875B (en
Inventor
朱叶峰
陈杰
於旺盛
杨露
壮欢
闫培养
芦海
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Gold East Paper Jiangsu Co Ltd
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Gold East Paper Jiangsu Co Ltd
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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
    • 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
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/36—Inorganic fibres or flakes
    • D21H13/38—Inorganic fibres or flakes siliceous
    • 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
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/36—Inorganic fibres or flakes
    • D21H13/38—Inorganic fibres or flakes siliceous
    • D21H13/40—Inorganic fibres or flakes siliceous vitreous, e.g. mineral wool, glass fibres
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/385—Oxides, hydroxides or carbonates
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/54—Starch
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/58—Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/84—Paper comprising more than one coating on both sides of the substrate
    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)

Abstract

The invention discloses coated paper for rotary press printing and a preparation method thereof, wherein the coated paper for rotary press printing comprises the following components: a raw paper layer; the bottom coating is arranged on two opposite sides of the raw paper layer in a joint mode, the top coating is arranged on one side, away from the raw paper layer, of the bottom coating in a joint mode, and the top coating is arranged on one side, away from the raw paper layer, of the bottom coating in a joint mode; the primer layer comprises a first adhesive, the first adhesive comprises starch and styrene-butadiene latex, and the mass ratio of the starch to the styrene-butadiene latex ranges from: 2-6: 6 to 12. The coated paper for the rotary press printing can not only ensure the self strength of the coated paper for the rotary press printing, but also ensure the air permeability/porosity of the coated paper for the rotary press printing to a certain extent.

Description

Coated paper for rotary press printing and preparation method thereof
Technical Field
The invention relates to the technical field of paper preparation, in particular to coated paper for rotary press printing and a preparation method thereof.
Background
The special coated paper for rotary printing has the characteristics of high temperature resistance and high ink drying speed, and can improve the printing quality of rotary printed matters while meeting the requirements of rotary printing. Meanwhile, rotary printing is a continuous and efficient printing mode, and is more and more favored by printing enterprises at home and abroad in recent years, so that the market of rotary special coated paper also tends to increase year by year.
The traditional production process of the art paper for the rotary press printing is to glue only by adopting the emulsion latex special for the rotary press in a coating formula, but the gel content of the emulsion latex special for the rotary press is low and the particle size is large, so the coating strength of the art paper for the rotary press printing produced by only adopting the emulsion latex special for the rotary press is poor, if the using amount of the emulsion latex special for the rotary press is increased, the air permeability/porosity of the art paper for the rotary press printing is insufficient, and the phenomenon of bubbling and layering is easily generated in the rotary press process.
Therefore, it is difficult for the conventional coated paper for rotary press printing to simultaneously secure the strength and air permeability/porosity of the paper.
Disclosure of Invention
The invention provides coated paper for rotary press printing and a preparation method thereof, and aims to solve the problem that the strength and air permeability/porosity of the coated paper for rotary press printing in the prior art are difficult to ensure at the same time.
In order to solve the above technical problems, the present invention provides a coated paper for printing of a rotary press, comprising: a raw paper layer; the bottom coating is arranged on two opposite sides of the raw paper layer in a joint mode, the top coating is arranged on one side, away from the raw paper layer, of the bottom coating in a joint mode, and the top coating is arranged on one side, away from the raw paper layer, of the bottom coating in a joint mode; the base coat comprises a first adhesive, the first adhesive is used for adhering the base coat and the raw paper layer, the first adhesive comprises starch and styrene-butadiene latex, and the mass ratio of the starch to the styrene-butadiene latex ranges from: 2-6: 6 to 12.
Wherein the water retention value of the bottom coating ranges from 60 to 75 grams per square meter.
The top coating comprises a second adhesive, the second adhesive is used for adhering the top coating and the bottom coating, the second adhesive comprises starch, styrene-butadiene latex and special cycle latex, and the mass ratio of the starch, the styrene-butadiene latex and the special cycle latex in the second adhesive is in the range as follows: 0 to 3: 3-5: 5 to 9.
Wherein the basecoat further comprises a first inorganic pigment comprising a first precipitated calcium carbonate, and the topcoat further comprises a second inorganic pigment comprising a second precipitated calcium carbonate, wherein the first precipitated calcium carbonate and the second precipitated calcium carbonate have different particle sizes.
Wherein the first precipitated calcium carbonate has a particle size range of: 1.1-1.5 microns, wherein the particle size range of the second precipitated calcium carbonate is as follows: 0.6 to 0.9 μm.
Wherein the mass ratio range of the first precipitated calcium carbonate in the first inorganic pigment is 30-50%; the mass ratio of the second precipitated calcium carbonate in the second inorganic pigment ranges from 30% to 50%.
Wherein, the fiber raw materials of the raw paper layer comprise: plant fibers and non-plant fibers; wherein the mass fraction range of the non-plant fibers in the fiber raw material is as follows: 5 to 10 percent.
Wherein the non-plant fibers comprise: one or more of aluminum silicate fibers, gypsum fibers, glass fibers and wollastonite fibers.
In order to solve the technical problem, the invention also provides a preparation method of the coated paper for the rotary press printing, which comprises the following steps: obtaining papermaking slurry, and papermaking slurry to obtain a raw paper layer; respectively forming a bottom coating on two opposite sides of the raw paper layer; forming a surface coating on one side of the base coating layer, which is far away from the raw paper layer, so as to obtain the coated paper for printing of the rotary press; the base coat comprises a first adhesive, the first adhesive is used for adhering the base coat and the raw paper layer, the first adhesive comprises starch and styrene-butadiene latex, and the mass ratio of the starch to the styrene-butadiene latex ranges from: 2-6: 6 to 12.
Wherein the step of forming the primer layer on each of opposite sides of the raw paper layer comprises: respectively coating base coating slurry on two opposite sides of the raw paper layer to form a base coating; the step of forming a top coat on the side of the base coat remote from the base paper layer comprises: coating a top coating slurry on one side of the base coating layer away from the raw paper layer to form a top coating; the base coating slurry comprises a first inorganic pigment and a first adhesive, the first inorganic pigment comprises first precipitated calcium carbonate, the top coating slurry comprises a second inorganic pigment and a second adhesive, and the second inorganic pigment comprises second precipitated calcium carbonate; the first precipitated calcium carbonate has a particle size range of: 1.1-1.5 microns, wherein the particle size range of the second precipitated calcium carbonate is as follows: 0.6 to 0.9 μm.
The invention has the beneficial effects that: different from the prior art, the mass ratio of the starch to the styrene-butadiene latex is in the range: 2-6: 6 ~ 12 first gluing agent come to make the water retention ability of under coat can enough guarantee the strength of the rotary machine copper plate paper for printing, has guaranteed the cohesion between under coat and the raw paper layer again to a certain extent, reduces the powder fall phenomenon to the air permeability/porosity of rotary machine copper plate paper for printing has been guaranteed to a certain extent.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of coated paper for rotary press printing according to the present invention;
FIG. 2 is a schematic flow chart of an embodiment of a method for preparing coated paper for rotary press printing according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of coated paper for rotary press printing according to the present invention.
Analysis confirms that the IGT strength of the traditional rotary printing coated paper is generally lower than that of the common offset coated paper, wherein the IGT strength of the rotary special coated paper is in the range of 180-210 cm/s, and the IGT strength of the common offset coated paper is in the range of 220-250 cm/s. Microscopic analysis on the printed powder falling samples detected by IGT strength shows that the powder falling points are all peeled off from the base coat and the raw paper layer of the coated paper for rotary press printing, so that IGT printing powder falling is caused, and the reason of poor strength is caused by weak bonding force of the base coat and the fiber layer. Therefore, in view of the above-described situation, the present embodiment adopts the following configuration to solve the above-described problem.
The coated paper 10 for rotary press printing of the present embodiment includes a base paper layer 11, a primer layer 12, and a top coat layer 13. Wherein, the opposite sides of the raw paper layer 11 are respectively provided with a bottom coating 12, and one side of each bottom coating 12 far away from the raw paper layer 11 is respectively provided with a top coating 13. The top coat layer 13, the base coat layer 12, the raw paper layer 11, the base coat layer 12, and the coating layer 13 of the present example were laminated in this order and attached.
The formula material of the base coating 12 in the coated paper 10 for rotary press printing of this embodiment includes a first adhesive, where the base coating 12 includes a first adhesive, and the first adhesive is used to adhere the base coating to the raw paper layer. The first adhesive comprises starch and styrene-butadiene latex, wherein the mass ratio of the starch to the styrene-butadiene latex is in the range of: 2-6: 6 to 12. The first adhesive within the range of the substantial amount ratio can control the water retention property of the undercoat layer within an optimum range. Preferably, the mass ratio of the starch to the styrene-butadiene latex is 5: at 9, the more balanced the water retention properties of the primer layer 12.
The better the water retention of the base coat 12, the more severely the first adhesive penetrates into the interior of the raw paper layer during the coating of the base coat 12, while the lower the water retention of the base coat 12, the less likely the first adhesive penetrates into the raw paper layer during the coating of the base coat 12. If the first adhesive is excessively permeated, the internal bonding force of the base coating 12 is weak, and the strength of the coated paper 10 for printing of the rotary press is poor; if the first adhesive penetrates too little, the anchoring effect is not generated, the bonding force between the base coating 12 and the raw paper layer 11 is weak, the base coating 12 is easy to pull up and peel off during printing, and the powder falling phenomenon is generated. The mass proportion range of the first adhesive of the base coat 12 in this embodiment enables the water retention performance of the base coat 12 to balance the osmosis effect of the first adhesive, so that the self strength of the coated paper 10 for printing of the rotary press is ensured, the binding force between the base coat 12 and the raw paper layer 11 is ensured to a certain extent, and the powder falling phenomenon is reduced.
In addition, in the embodiment, the butylbenzene latex is used as the adhesive of the first adhesive to realize adhesion between the raw paper layer 11 and the base coating layer 12, instead of being carried out by the special rotating latex, so that a large amount of the first adhesive is reduced, and the air permeability/porosity of the coated paper 10 for printing of the rotating machine is ensured to a certain extent.
The coated paper for the rotary press printing in the embodiment adopts the following mass ratio ranges: 2-6: 6 ~ 12 first gluing agent makes the water retention ability of under coat can enough guarantee the self intensity of rotary press printing with coated paper, has guaranteed the cohesion again to a certain extent between under coat and the raw paper layer, reduces the phenomenon of falling powder to the air permeability/porosity of rotary press printing with coated paper 10 has been guaranteed to a certain extent.
Referring further to fig. 1, fig. 1 is a schematic structural diagram of another embodiment of the coated paper for rotary press printing according to the present invention.
In this embodiment, the structural positions among the raw paper layer 11, the primer layer 12, and the top coating layer 13 and the mass ratio ranges of the components in the first adhesive are the same as those in the foregoing embodiment, please refer to the foregoing embodiment, and details are not repeated herein.
The formulation of the primer layer 12 includes a first inorganic pigment and a first adhesive. The first adhesive comprises starch and styrene-butadiene latex, wherein the mass ratio of the starch to the styrene-butadiene latex is in the range: 2-6: 6 to 12. The top coat layer 13 comprises a second inorganic pigment and a second adhesive, the second adhesive comprises starch, styrene-butadiene latex and cycle-specific latex, wherein the mass ratio of the starch to the styrene-butadiene latex to the cycle-specific latex is in the range of: 0-3: 3-5: 5 to 9. The second adhesive in this range can ensure the air permeability and porosity between the top coating 13 and the bottom coating 12, so as to reduce the excessively low air permeability, so that the coated paper 10 for the rotary press printing is blocked by the excessively airtight coating in the rotary press printing process and the high-temperature drying printing process, and further the coated paper 10 for the rotary press printing generates the layered bubbling phenomenon. Preferably, the mass ratio of the starch to the styrene-butadiene latex to the rotation-dedicated latex in the second adhesive is 0:4: 7.
The latex for rotation of the embodiment is latex with gel content of about 30-40% and particle size of about 185 nm.
The first inorganic pigment includes a first precipitated calcium carbonate and a first ground calcium carbonate, and the second inorganic pigment includes a second precipitated calcium carbonate and a second ground calcium carbonate. The first precipitated calcium carbonate is different from the second precipitated calcium carbonate in particle size, specifically, the first precipitated calcium carbonate has a particle size range of: 1.1 to 1.5 microns, and the second precipitated calcium carbonate has a particle size range of: 0.6 to 0.9 μm.
The first ground calcium carbonate may include C65 ground calcium carbonate, while the C65 ground calcium carbonate is a ground calcium carbonate in which greater than 65% of the particles have a particle size of less than 2 microns. The second ground calcium carbonate may include C98 ground calcium carbonate, while the C98 ground calcium carbonate is a ground calcium carbonate in which greater than 98% of the particles have a particle size of less than 2 microns.
In one particular application scenario, the ingredients of the base coat 12 include C65 ground calcium carbonate, a first precipitated calcium carbonate, starch, and styrene-butadiene latex. Wherein, the proportioning range of each component in the bottom coating 12 is: c65 ground calcium carbonate: 40-60 parts, 40-60 parts of first precipitated calcium carbonate, and starch: 2-6 parts of styrene-butadiene latex: 6-12 parts. The first inorganic pigment of this example, i.e., the C65 ground calcium carbonate and the first precipitated calcium carbonate, were added to make 100 parts by weight, the starch was added in an amount of 2 to 6 parts by weight based on the first inorganic pigment, and the styrene-butadiene latex was added in an amount of 6 to 12 parts by weight based on the first inorganic pigment. The weight of this example refers to the absolute amount of material. Specifically, the starch may be 3 parts, 4 parts, 5 parts, etc., and the styrene-butadiene latex may be 7 parts, 9 parts, 10 parts, 11 parts, etc., which may be set based on the actual situation, and is not limited herein.
The water retention value range of the base coating 12 can be within 60-75 g/m through the first adhesive in the proportion, and therefore the osmosis effect of the first adhesive is balanced through the water retention value in the range. That is, the water retention value of the undercoat layer 12 is controlled within an optimum range by means of the tackifier selection and the solid content adjustment. In a preferred embodiment, the first adhesive comprises 5 parts of starch and 9 parts of styrene-butadiene latex. The first adhesive with the ratio can balance the strength of paper and air permeability/void ratio better.
In a specific application scenario, the ratio of the components in the primer layer 12 may be: c65 ground calcium carbonate: 40 parts of the first precipitated calcium carbonate, 60 parts of the starch, 6 parts of the styrene-butadiene latex and 7 parts of the styrene-butadiene latex, the total of the components of the whole base coat 12 is 113 parts.
In one particular application scenario, the topcoat 13 includes C98 ground calcium carbonate, a second precipitated calcium carbonate, starch, styrene-butadiene latex, and roto-specific latex. The proportion range of each component in the top coating 13 is as follows: c98 ground calcium carbonate: 50-80 parts, 20-50 parts of second precipitated calcium carbonate, and starch: 0-3 parts of styrene-butadiene latex: 3-5 parts of special rotary latex: 5-9 parts. The second inorganic pigment of this example, i.e., the C98 ground calcium carbonate and the second precipitated calcium carbonate, were added to make 100 parts by weight, the starch was added in an amount of 0 to 3 parts by weight, the styrene-butadiene latex was added in an amount of 3 to 5 parts by weight, and the rotation-exclusive latex was added in an amount of 5 to 9 parts by weight. Specifically, the starch may be 0 part, 1 part, 2 parts, etc., the styrene-butadiene latex may be 3 parts, 4 parts, 5 parts, etc., and the rotation-dedicated latex may be 6 parts, 7 parts, 8 parts, which may be set based on the actual situation, and is not limited herein. In a preferred embodiment, the second adhesive comprises 0 part of starch, 4 parts of styrene-butadiene latex and 7 parts of cycle-specific latex.
Where precipitated and ground calcium carbonate are used in the top coat 13 and the base coat 12, the particle size of the precipitated calcium carbonate may have an effect on the porosity of each coat. The precipitated calcium carbonate with small particle size can cause the porosity of the coating on which the precipitated calcium carbonate is arranged to be increased and the strength to be reduced, meanwhile, the precipitated calcium carbonate with small particle size can cause the demand of the first adhesive to be increased, and the excessive first adhesive can influence the porosity and the air permeability of the coating, therefore, in this embodiment, the first precipitated calcium carbonate having a larger particle size is selected in the undercoat layer 12 to ensure the strength of the undercoat layer 12 without affecting the required amount of the first adhesive too much, the precipitated calcium carbonate with smaller grain diameter selected in the top coating 13 can improve the porosity/air permeability of the coating as much as possible on the premise of not influencing the strength of the top coating 13, ensure the anti-layering and anti-bubbling performance of the rotary copper during printing and drying, so that the precipitated calcium carbonate with different grain sizes is respectively adopted by the bottom coating 12 and the top coating 13, thereby taking the porosity/air permeability and the coating strength of the coating into consideration.
In a specific application scenario, the mass ratio of the first precipitated calcium carbonate in the first inorganic pigment is 30% to 50%, that is, the weight of the first inorganic pigment is divided into 100 parts, and the weight ratio of the first precipitated calcium carbonate therein is 30 to 50 parts. The mass ratio of the second precipitated calcium carbonate in the second inorganic pigment ranges from 30% to 50%, namely the weight of the second inorganic pigment is divided into 100 parts, and the weight ratio of the second precipitated calcium carbonate in the second inorganic pigment ranges from 30 parts to 50 parts. Specifically, the amount of the organic solvent may be 35 parts, 40 parts, 45 parts, or the like, and may be set based on actual conditions, which is not limited herein.
In a specific application scenario, when the weight of the first inorganic pigment is 100 jin, the weight of the first precipitated calcium carbonate is in a range of 30-50 jin.
The raw paper layer 11 in this embodiment includes plant fibers and non-plant fibers. Wherein the plant fiber comprises bleached kraft softwood pulp (NBKP) and bleached kraft hardwood pulp (LBKP), and the non-plant fiber comprises: one or more of aluminum silicate fibers, gypsum fibers, glass fibers and wollastonite fibers. The mass fraction range of the non-plant fiber in the fiber raw material is as follows: 5 to 10 percent. Specifically, the concentration may be 6%, 7%, 8%, or 9%, and the like, and may be set based on actual conditions, which is not limited herein.
In the embodiment, a small amount of non-plant fibers are added into the base paper layer, so that the water absorption performance of the base paper fibers in a wet environment and the water release performance of the base paper fibers in a dry environment are reduced, and the adaptability of the coated paper for printing of a rotary press in different environments is improved.
Because the base paper strength requirement of the coated paper for the rotary press printing is high, the defibrination is relatively heavy in the production process, the fiber freeness is relatively low, the hydrophilic groups-OH groups on the surface of the fiber are more, and the fibrillation on the surface of the fiber is obvious, so the coated paper for the rotary press printing is easily influenced by moisture in the air, the moisture in the air is easily absorbed under a high-humidity environment, the water content of the paper is increased, the probability of bubbling layering generated in the high-temperature drying process after the rotary press is finally increased, and the moisture is released under the low-humidity environment, the water content of the paper is reduced, the ink is excessively absorbed during the rotary press, and the printing effect is relatively poor.
The non-plant fiber with the content of 5-10% is added into the raw paper layer 11, the sensitivity of water vapor of the raw paper fiber in high and low humidity environments can be effectively reduced, and the influence of the environmental humidity on the moisture of the rotary copper is reduced, so that the possibility of bubbling and layering of the paper after printing in the high humidity environment is reduced, and the layering and foaming resistance of the coated paper for printing of a rotary press and the printing effect of the paper in the low humidity environment are improved.
Through the proportion, the base coat and the top coat of the embodiment adopt different adhesive combinations to take account of the porosity/air permeability of the coat, wherein the base coat only uses the first adhesive combination of starch and common styrene-butadiene latex to strengthen the strength of the coat, the optimal design of the water retention value is realized through the proportion of all substances in the first adhesive, the penetration of the first adhesive of the base coat is properly enhanced, and the binding force between the coat and the raw paper layer is enhanced through the anchoring effect. In addition, the base coat and the top coat of the embodiment adopt precipitated calcium carbonate with different particle sizes, and the porosity/air permeability and the strength of the coat are considered. Specifically, the large particle size precipitated calcium carbonate is used for the base coat layer to take account of the coating strength, and the small particle size precipitated calcium carbonate is used for the top coat layer to mainly improve the porosity/air permeability of the coating. Finally, in the production process of the base paper, 5-10% of non-plant fibers are added, so that the sensitivity of the base paper fibers to moisture in air is reduced, the moisture of the rotary copper plate paper in a high-humidity environment is stabilized, and the possibility of drying, layering and bubbling of the rotary copper in the high-humidity environment is reduced.
The properties of the coated paper for rotary press printing according to the above formulation of the present invention will be examined through a plurality of specific examples. Among them, the paper was examined using a 120 g/m weight coated paper for rotary press printing as an example.
Figure BDA0002886407420000081
Figure BDA0002886407420000091
Figure BDA0002886407420000101
As can be seen from the comparison of the control group with examples 1-2, the coated paper for rotary press printing of the present invention uses precipitated calcium carbonate having different particle sizes, and thus has both porosity/air permeability and IGT strength. As can be seen from comparison between the control group and the examples 4 to 7, the coated paper base coat for rotary press printing only uses the first adhesive combination of starch and common styrene-butadiene latex to enhance the strength of the coating, realizes the optimal design of the water retention value through the proportion of all substances in the first adhesive, and moderately enhances the air permeability. Comparing the control group with examples 5-7, the coated paper for rotary press printing of the present invention has 5-10% non-plant fiber added to reduce the equilibrium moisture of the coated paper for rotary press printing, and thus the sensitivity to humidity is reduced.
Referring to fig. 1-2, fig. 2 is a schematic flow chart of an embodiment of a method for manufacturing coated paper for rotary press printing according to the present invention. The method for producing coated paper for rotary press printing will be described with reference to fig. 1 to 2.
Step S11: and obtaining papermaking slurry, and papermaking slurry to obtain the raw paper layer.
The papermaking stock may include bleached kraft softwood pulp (NBKP), bleached kraft hardwood pulp (LBKP), and non-plant fibers, and is used to make the raw paper layer 11.
Wherein the non-plant fibers comprise: one or more of aluminum silicate fibers, gypsum fibers, glass fibers and wollastonite fibers. And the mass fraction range of the non-plant fibers in the papermaking slurry is as follows: 5 to 10 percent.
In the embodiment, the sensitivity of the base paper fiber to moisture in air is reduced by adding 5-10% of non-plant fiber, so that the moisture of the rotary copper-coated paper in a high-humidity environment is stabilized, and the possibility of drying, layering and bubbling of the rotary copper in the high-humidity environment is reduced.
Step S12: and respectively forming a base coat on two opposite sides of the raw paper layer.
The base coating layer 12 is formed on opposite sides of the raw paper layer 11, respectively. Specifically, a primer slurry is coated on opposite sides of the raw paper layer 11 to form the primer layer 12, wherein the primer slurry includes a first inorganic pigment and a first adhesive.
Step S13: forming a surface coating on one side of the base coating layer away from the raw paper layer to obtain coated paper for printing of a rotary press; the base coat comprises a first adhesive, the first adhesive is used for adhering the base coat and the raw paper layer, the first adhesive comprises starch and styrene-butadiene latex, and the mass ratio of the starch to the styrene-butadiene latex ranges from: 2-6: 6 to 12.
Forming a top coating 13 on one side of the base coating 12, which is far away from the raw paper layer 11, to obtain the coated paper 10 for the printing of the rotary press, wherein the base coating 12 comprises a first adhesive, the first adhesive comprises starch and styrene-butadiene latex, and the mass ratio of the starch to the styrene-butadiene latex ranges from: 2-6: 6 to 12.
Specifically, a top coating slurry is applied to the base coat layer 12 on the side away from the raw paper layer 11 to form a top coat layer 13. The top coating slurry comprises a second inorganic pigment and a second adhesive.
In one particular application scenario, the first inorganic pigment may include C65 ground calcium carbonate and a first precipitated calcium carbonate. The first adhesive may include starch and styrene-butadiene latex.
In a specific application scenario, the ratio range of each component in the primer 12 or primer slurry is as follows: c65 ground calcium carbonate: 40-60 parts, 40-60 parts of first precipitated calcium carbonate, and starch: 2-6 parts of styrene-butadiene latex: 6-12 parts. The first precipitated calcium carbonate has a particle size range of: 1.1 to 1.5 μm.
In a particular application scenario, the topcoat 13 or topcoat slurry may include a second inorganic pigment and a second binder, the second inorganic pigment including a second precipitated calcium carbonate; wherein the second precipitated calcium carbonate has a particle size range of: 0.6 to 0.9 μm.
In one particular application scenario, the topcoat 13 or topcoat slurry comprises C98 ground calcium carbonate, a second precipitated calcium carbonate, starch, styrene-butadiene latex, and roto-latex. The proportion range of each component in the top coating 13 is as follows: c98 ground calcium carbonate: 50-80 parts, 20-50 parts of second precipitated calcium carbonate, and starch: 0-3 parts of styrene-butadiene latex: 3-5 parts of special rotary latex: 5-9 parts.
Through the undercoat 12 with the above ratio, the strength of the coating is enhanced only by the combination of the first adhesive of starch and common styrene-butadiene latex, the optimal design of the water retention value is realized through the ratio of each substance in the first adhesive, the penetration of the first adhesive of the undercoat 12 is moderately enhanced, and the bonding force between the coating and the raw paper layer 11 is enhanced through the anchoring effect.
The base coat and the top coat of this example are selected from precipitated calcium carbonate of different particle sizes, giving consideration to the porosity/air permeability and the strength of the coating. Specifically, the large particle size precipitated calcium carbonate is used for the base coat layer to take account of the coating strength, and the small particle size precipitated calcium carbonate is used for the top coat layer to mainly improve the porosity/air permeability of the coating.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. The utility model provides a rotary press is coated paper for printing which characterized in that, rotary press is coated paper for printing includes:
a raw paper layer;
the base coat is attached to two opposite sides of the raw paper layer,
the top coating layer is attached to one side, far away from the raw paper layer, of the bottom coating layer;
the base coat comprises a first adhesive, the first adhesive is used for adhering the base coat and the raw paper layer, the first adhesive comprises starch and styrene-butadiene latex, and the mass ratio of the starch to the styrene-butadiene latex ranges from: 2-6: 6 to 12.
2. The coated paper for rotary press printing according to claim 1, wherein the water retention value of the undercoat layer is in the range of 60 to 75 g/m.
3. The coated paper for rotary press printing according to claim 1, wherein the top coat layer comprises a second adhesive, the second adhesive is used for adhering the top coat layer and the bottom coat layer, the second adhesive comprises starch, styrene-butadiene latex and special rotary latex, and the mass ratio of the starch to the styrene-butadiene latex to the special rotary latex in the second adhesive is in the range of: 0-3: 3-5: 5 to 9.
4. A coated paper for rotary press printing according to claim 1,
the base coat further comprises a first inorganic pigment comprising a first precipitated calcium carbonate;
the topcoat further includes a second inorganic pigment comprising a second precipitated calcium carbonate, wherein the first precipitated calcium carbonate is different in particle size from the second precipitated calcium carbonate.
5. A coated paper for rotary press printing according to claim 4, wherein the first precipitated calcium carbonate has a particle size in the range of: 1.1-1.5 microns, wherein the particle size range of the second precipitated calcium carbonate is as follows: 0.6 to 0.9 μm.
6. A coated paper for a rotary press printing according to claim 4,
the mass ratio range of the first precipitated calcium carbonate in the first inorganic pigment is 30-50%;
the mass ratio of the second precipitated calcium carbonate in the second inorganic pigment ranges from 30% to 50%.
7. A coated paper for rotary press printing according to claim 1, wherein the fiber raw material of the raw paper layer comprises: plant fibers and non-plant fibers;
wherein the mass fraction range of the non-plant fibers in the fiber raw material is as follows: 5 to 10 percent.
8. A rotary press printing coated paper according to claim 6, wherein the non-plant fibers comprise: one or more of aluminum silicate fibers, gypsum fibers, glass fibers and wollastonite fibers.
9. The preparation method of the coated paper for the rotary press printing is characterized by comprising the following steps of:
obtaining papermaking slurry, and papermaking the papermaking slurry to obtain a raw paper layer;
respectively forming a base coat on two opposite sides of the raw paper layer;
forming a surface coating on one side of the base coating layer away from the raw paper layer to obtain coated paper for printing of a rotary press; the base coat comprises a first adhesive, the first adhesive is used for adhering the base coat and the raw paper layer, the first adhesive comprises starch and styrene-butadiene latex, and the mass ratio of the starch to the styrene-butadiene latex ranges from: 2-6: 6 to 12.
10. The method of making a coated paper for rotogravure printing according to claim 9, wherein the step of forming a primer layer on each of opposite sides of the raw paper layer comprises:
respectively coating base coating slurry on two opposite sides of the raw paper layer to form the base coating;
the step of forming a top coat on the side of the base coat remote from the raw paper layer comprises:
applying a top coat slurry to the base coat layer on a side thereof remote from the base paper layer to form the top coat layer;
the base coating slurry comprises a first inorganic pigment and a first adhesive, the first inorganic pigment comprises first precipitated calcium carbonate, the top coating slurry comprises a second inorganic pigment and a second adhesive, and the second inorganic pigment comprises second precipitated calcium carbonate; the first precipitated calcium carbonate has a particle size range of: 1.1-1.5 microns, wherein the particle size range of the second precipitated calcium carbonate is as follows: 0.6 to 0.9 μm.
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CN102912689A (en) * 2012-10-18 2013-02-06 山东晨鸣纸业集团股份有限公司 White-surface coated craft paper and production method thereof
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