CN109183490B - High-barrier coating white cardboard and preparation method thereof - Google Patents
High-barrier coating white cardboard and preparation method thereof Download PDFInfo
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- CN109183490B CN109183490B CN201811087439.7A CN201811087439A CN109183490B CN 109183490 B CN109183490 B CN 109183490B CN 201811087439 A CN201811087439 A CN 201811087439A CN 109183490 B CN109183490 B CN 109183490B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- 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
- D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
-
- 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
- D21H19/46—Non-macromolecular organic compounds
- D21H19/48—Diolefins, e.g. butadiene; Aromatic vinyl monomers, e.g. styrene; Polymerisable unsaturated acids or derivatives thereof, e.g. acrylic acid
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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
- 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
Abstract
The invention discloses a high-barrier coating white cardboard which comprises a cardboard base layer and a high-barrier coating, wherein the high-barrier coating is coated on the front surface and/or the back surface of the cardboard base layer and is made of a high-barrier agent, and the high-barrier agent consists of the following components in parts by mass: 8-30 parts of styrene, 1-5 parts of butadiene, 8-32 parts of polybutyl acrylate, 7-15 parts of polyolefin, 1-8 parts of isooctyl acrylate and 5-28 parts of porcelain clay. The high-barrier coated white cardboard is obtained by the steps of pulping, surfing the net, squeezing to remove water, primary drying, on-line coating in the machine, secondary drying and the like. The high-barrier coated white cardboard has good water vapor, fragrance and oxygen isolation performance, can be recycled, and is very environment-friendly. In addition, the manufacturing process of the high-barrier coating white cardboard is simple, the cost can be obviously reduced, the production efficiency is improved by 10 times compared with that of the traditional PE laminating paper making technology, and 25-40% of transportation cost and 15-25% of inventory cost are saved.
Description
Technical Field
The invention belongs to the field of high-barrier coated paper, and particularly relates to a high-barrier coated white cardboard and a preparation method thereof.
Background
The barrier property of the paper package means that the paper package has a shielding function for water vapor, aroma, oxygen and the like, but the barrier property of the main structure fiber of the paper is poor, so that the barrier property requirement of the paper package cannot be met.
In the prior art, the white cardboard is mostly produced by a PE (polyethylene) film coating method and is used as a packaging material with a barrier function. However, the PE film coating is carried out by using an external film coating mode, the process is relatively complex in the production process, the production efficiency is low, the manufacturing cost is high, the PE film coating paper is difficult to degrade in nature, and the factory recycling cost is high. With the successive departure of international environmental protection policies, environmental protection becomes a key index of packaging materials, and countries have already proposed a relevant environmental protection tax revenue collection system for the problem, so it is necessary to develop a high-barrier coated white cardboard which is environment-friendly and can replace PE laminating paper from the viewpoints of product environmental protection, production process improvement, production efficiency improvement and production cost reduction.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a high-barrier coated white cardboard and a preparation method thereof, wherein the method is mainly used for forming a barrier coating on the surface of paper by a single-time or multi-time coating mode so as to enable the surface of the paper to have barrier property. The production process of the high-barrier coated white cardboard is mainly improved, an in-machine line coating mode is adopted, the high-barrier agent with water-based property is coated on the cardboard base layer when the cardboard base layer is produced, the process flow can be shortened, the production cost is saved, and the produced high-barrier coated white cardboard can be naturally degraded, is very convenient to recycle and is very beneficial to environmental protection. The in-machine on-line coating is used for a paper machine or a whole production line and can be matched with pulping, paper machines, coating and the like.
In order to achieve the purpose of the invention, the technical scheme is as follows.
The high-barrier coating white cardboard comprises a cardboard base layer and a high-barrier coating, wherein the front surface and/or the back surface of the cardboard base layer are coated with the high-barrier coating, the high-barrier coating is made of a high-barrier agent, and the high-barrier agent comprises styrene, butadiene, polybutyl acrylate, polyolefin, isooctyl acrylate and china clay.
The high-barrier agent comprises the following components in parts by mass: 8-30 parts of styrene, 1-5 parts of butadiene, 8-32 parts of polybutyl acrylate, 7-15 parts of polyolefin (for example, the polyolefin can comprise at least one of polypropylene and polybutylene), 1-8 parts of isooctyl acrylate and 5-28 parts of china clay.
Further preferably, the high-barrier agent consists of the following components in parts by mass: 10-25 parts of styrene, 1-3 parts of butadiene, 10-25 parts of polybutyl acrylate, 7-15 parts of polyolefin, 1-5 parts of isooctyl acrylate and 8-25 parts of porcelain clay.
The preparation process of the high-barrier agent comprises the following steps: adding 10-25 parts of styrene and 1-3 parts of butadiene into a reaction kettle, reacting for 20-65min (preferably 30-60 min) under the conditions of the temperature of 40-75 ℃ (preferably 50-70 ℃) and the pressure of 15-25MPa (preferably 20 MPa), then adding 10-25 parts of polybutyl acrylate, reacting for 10-20min, then adding 7-15 parts of polyolefin, reacting for 30-40min under the same temperature and pressure, adding 8-25 parts of china clay (the mass concentration of the china clay is 8-10%), raising the temperature to 250 ℃ and reducing the pressure to 8-12MPa (preferably 10 MPa), reacting for 4-6h under the conditions, completely cooling after the reaction is completed, taking out the product, and obtaining the high barrier agent, wherein the viscosity of the high barrier agent is 3000cps of 1000.
Optionally, the paperboard substrate is cupstock paper.
A preparation method of a high-barrier coated white cardboard comprises the following steps:
(1) pulping: the paperboard basic layer is divided into a surface paper layer, a core paper layer and a bottom paper layer, a pulp board for preparing surface paper layer pulp, core paper layer pulp and bottom paper layer pulp (the pulp board is one kind of paper pulp, is a thick paperboard formed by dewatering and squeezing the paper pulp, the gram weight is generally more than 250 g, and the manufacturing of the pulp board in the paper industry is mainly convenient for transportation) is screened, pulped and prepared by a D-type hydrapulper, the mass concentration of the pulped pulp is 3.5-6.5%, and the surface paper layer pulp, the core paper layer pulp and the bottom paper layer pulp are respectively prepared;
(2) surfing the Internet: respectively filtering the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry prepared in the step (1), and then compounding, wherein the networking speed of the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry in the compounding process is 300-400 mu m/min, so as to obtain a composite slurry, and the overall thickness of the three slurries after compounding is 150-350 mu m, preferably 170-350 mu m;
(3) squeezing to remove water: the composite pulp prepared in the step (2) is firstly pressed by a blind hole press roll (provided by Fuyite Limited and with the specification of phi 920 multiplied by 4960 mm) with the pressure of 120-140kN/m (preferably 130 kN/m), and then the paper is pressed by a shoe press roll (provided by Fuyite Limited and with the specification of phi 1044 multiplied by 4700 mm) with the pressure of 680-720kN/m (preferably 700 kN/m);
(4) primary drying: drying the composite pulp squeezed and dewatered in the step (3), and drying by adopting a plurality of groups (such as 2-10 groups) of drying cylinders, wherein the drying temperature is increased in a gradient manner (the specific process is that the temperature is kept at 25-50 ℃ for 30min, the temperature is kept at 50-80 ℃ for 25-30min, and the temperature is kept at 80-130 ℃ (preferably 80-120 ℃) for 15-20 min), the cylinder surface temperature of the drying cylinders is sequentially increased from 50 ℃ to 120 ℃ until the moisture content in the pulp is 5-12% (preferably 6.5-10%), so as to obtain a paperboard base layer;
(5) coating on line in the machine: in order to improve the surface strength of paper, coating a high barrier agent on at least one of two surfaces of the paperboard base layer prepared in the step (4);
(6) and (3) drying again: and (3) drying the paperboard substrate coated with the high-barrier agent in the step (5), and drying by using a hot air box of a paper machine (provided by Fuyite Co., Ltd.), wherein the drying temperature is 140-.
In the step (1), the surface paper layer slurry is prepared from the following components in parts by mass: 60-100 parts (preferably 70-90 parts) of bleached hardwood sulfate pulp and 8-35 parts (preferably 10-30 parts) of bleached softwood sulfate pulp.
In the step (1), the core paper layer slurry is prepared from the following components in parts by mass: 35-50 parts (preferably 40-45 parts) of chemithermomechanical pulp, 2-12 parts (preferably 5-10 parts) of bleached hardwood sulphate pulp, 8-18 parts (preferably 10-15 parts) of bleached softwood sulphate pulp and 30-45 parts (preferably 35-40 parts) of broke.
In the step (1), the base paper layer slurry is prepared from the following components in parts by mass: 70-100 parts (preferably 80-90 parts) of bleached hardwood sulfate pulp and 5-20 parts (preferably 10-20 parts) of bleached softwood sulfate pulp.
The solid content of the bleached hardwood sulfate pulp, the bleached softwood sulfate pulp and the chemithermomechanical pulp is 3.0-4.5 percent, and the pH value is 4.5-6.0.
The screening in the step (1) mainly aims at screening impurities in the slurry, and the impurities in the slurry are removed through a pressure hole screen of 2-5mm (preferably 4 mm).
The on-line coating process in the machine in the step (5) is improved on the basis of the normal white cardboard process flow, and mainly changes the coating process, and the specific process is as follows: the high-barrier agent is coated on the back and/or the front (the backing paper layer is the back, and the surface paper layer is the front), wherein the back coating adopts a metering rod, the diameter is 12mm, and the coating amount is 3-15g/m2The front surface is coated with a ceramic wear-resistant scraper with a coating weight of 3-10g/m2(ii) a The normal paper is dried after being coated with the coating, but the normal paper is dried by infrared drying or hot air drying, and the back coating and/or the front coating are dried by a combined mode of infrared drying and hot air drying, so that the effect of quickly drying the high-barrier agent is achieved, the physical performance of the paper can be obviously improved, and the influence of sticking a stick or breaking the paper by the barrier agent is solved (the influence of sticking the stick or breaking the paper can be solved by drying in a combined mode of infrared drying and hot air drying, but the high-barrier agent is not prevented from permeating into the paper to coat the end face of the fiber and fill gaps among the fibers), and the internal online coating is adopted, so that the external coating is not needed compared with the traditional PE laminating card paper, the preparation process is shortened, and the preparation cost is saved. The speed of the traditional PE laminating production process is 100-200m/min, the width is 0.78-1.3m, the speed of the on-line coating in the machine is 350-550m/min, and the width is 4.5m, compared with the production efficiency of the technical scheme of the invention which is 10 times of that of the PE laminating outside the machine.
Preferably, in the step (5), the coating is performed in a high resistance mannerCoating starch solution on at least one of two surfaces of the paperboard base layer before the separating agent for surface sizing (namely coating the starch solution on the surface of the paperboard base layer), wherein the coating amount of the starch is 1.5-3.5g/m2(the coating amount of starch is oven dry amount). The preparation process of the starch solution comprises the following steps: dissolving starch in water at 18-22% (preferably 20%) by mass concentration, cooking in a cooker at 90-100 deg.C (preferably 95 deg.C) for 20-30min (preferably 25 min), and diluting the cooked starch solution with water to 5-15%.
The step (5) of coating the high-barrier agent is divided into single-side coating or double-side coating, and the coating amount of the front side of the single-side coating is 0g/m2The back coating weight is 3-15g/m2(preferably 4 to 12 g/m)2) (ii) a The coating weight of the front surface of the double-sided coating is 1-10g/m2(preferably 3 to 9 g/m)2) The back coating weight is 3-15g/m2(preferably 4 to 12 g/m)2）。
And (6) drying by using a hot air box of a paper machine, wherein the drying temperature is 140-.
In addition, the front surface (i.e. the surface paper layer) of the general paper is coated three times, the back surface (i.e. the bottom paper layer) is coated once, the back surface is coated, the first time of the front surface coating is called bottom coating, the second time is called core coating, and the third time is called surface coating.
Compared with the traditional aluminized paperboard or PE film-coated paperboard, the technical scheme of the invention has the following beneficial effects:
(1) the high-barrier agent is environment-friendly, and can save aluminum materials;
(2) the high-barrier agent has good compactness and can isolate water vapor, fragrance and oxygen;
(3) the production process is simple, the production cost is obviously reduced, the PE film coated paperboard is replaced, the prepared high-barrier coated white paperboard can be decomposed and recovered, the recovery cost is obviously reduced, the technical breakthrough is realized, and the technical vacancy of the high-barrier coated white paperboard in machines at home and abroad is filled.
(4) Compared with the traditional PE laminating card paper, the high-barrier coating white card paper manufactured by the technical scheme of the invention can save 25-40% of transportation cost and 15-25% of stock cost.
(5) The speed of the conventional PE laminating production process is 100-200m/min, the width is 0.78-1.3m, the speed of the online coating in the machine is 350-550m/min, and the width is 4.5m, compared with the production efficiency of the technical scheme of the invention which is 10 times that of the PE laminating outside the machine.
Detailed Description
In order to make the technical solutions of the present invention more obvious to those skilled in the art, some examples are listed below.
Example 1
The high-barrier agent comprises the following components in parts by mass: 8 parts of styrene, 1 part of butadiene, 8 parts of polybutyl acrylate, 7 parts of polyolefin, 1 part of isooctyl acrylate and 5 parts of china clay.
The preparation process of the high-barrier agent comprises the following steps: adding 10 parts of styrene and 1 part of butadiene into a reaction kettle, reacting for 20min at the temperature of 40 ℃ and the pressure of 15MPa, then adding 10 parts of polybutyl acrylate, reacting for 10min, then adding 7 parts of polyolefin, reacting for 30min at the same temperature and pressure, then adding 8 parts of china clay (the concentration is 9%), raising the temperature to 150 ℃, reducing the pressure to 8MPa, reacting for 4h under the condition, and taking out the product after the reaction is completely cooled to obtain the high barrier agent.
A preparation method of a high-barrier coated white cardboard comprises the following steps:
(1) pulping: the paperboard basic layer is divided into a surface paper layer, a core paper layer and a bottom paper layer, a pulp board for preparing surface paper layer pulp, core paper layer pulp and bottom paper layer pulp (the pulp board is one kind of paper pulp, is a thick paperboard formed by dewatering and squeezing the paper pulp, the gram weight is generally more than 250 g, and the manufacturing of the pulp board in the paper industry is mainly convenient for transportation) is screened, pulped and prepared by a D-type hydrapulper, the mass concentration of the pulped pulp is 3.5-6.5%, and the surface paper layer pulp, the core paper layer pulp and the bottom paper layer pulp are respectively prepared;
(2) surfing the Internet: respectively filtering the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry prepared in the step (1) to remove water, and then compounding, wherein the net surfing speed of the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry in the compounding process is 300m/min, so that a compound slurry is obtained, and the overall thickness of the compounded three slurries is 150 micrometers;
(3) squeezing to remove water: pressing the composite pulp prepared in the step (2) by using a blind hole press roll at the pressure of 120kN/m, and pressing paper by using a shoe press roll at the pressure of 680 kN/m;
(4) primary drying: drying the composite slurry squeezed and dewatered in the step (3), and drying by adopting a plurality of groups (such as 2 groups) of drying cylinders, wherein the drying temperature is increased in a gradient manner (the temperature is kept at 25 ℃ for 30min, the temperature is kept at 50 ℃ for 30min, and the temperature is kept at 130 ℃ for 20 min), the temperature of the surface of each drying cylinder is sequentially increased from 50 ℃ to 120 ℃, until the moisture content in the slurry is 5%, so that a paperboard base layer is obtained;
(5) coating on line in the machine: in order to improve the surface strength of paper, coating a high barrier agent on one of two surfaces of the paperboard base layer prepared in the step (4);
(6) and (3) drying again: and (3) drying the paperboard base layer coated with the high-barrier agent in the step (5) by using a hot air box of a paper machine, wherein the drying temperature is 140 ℃, and the speed of the paper machine is 350m/min, so as to obtain the high-barrier coated white paperboard.
The on-line coating process in the machine in the step (5) comprises the following specific processes: the high-barrier agent is coated on the back surface (namely the backing paper layer is the back surface), wherein the back coating adopts a metering rod, the diameter is 12mm, and the coating amount is 3g/m2And then drying by using a combined mode of infrared drying and hot air drying.
In the step (5), the coating amount of the starch on the back surface of the paperboard base layer is 1.5g/m2In the step (5), before coating the high-barrier agent, a starch solution is further coated on the back surface of the paperboard base layer for surface sizing (namely coating the starch solution on the surface of the paperboard base layer), and the coating amount of the starch is 1.5g/m2(the coating amount of starch is absolute dry amount) the preparation process of the starch solution is as follows: dissolving starch in water at a mass concentration of 18%, and steaming at 90 deg.C in a steamerAnd (5) diluting the cooked starch solution to 5% with water for later use within 20 min.
In the step (1), the surface paper layer slurry is prepared from the following components in parts by mass: 60 parts of bleached hardwood sulfate pulp and 8 parts of bleached softwood sulfate pulp.
In the step (1), the core paper layer slurry is prepared from the following components in parts by mass: 35 parts of chemithermomechanical pulp, 2 parts of bleached hardwood kraft pulp, 8 parts of bleached softwood kraft pulp and 30 parts of broke.
In the step (1), the base paper layer slurry is prepared from the following components in parts by mass: 70 parts of bleached hardwood sulfate pulp and 5 parts of bleached softwood sulfate pulp.
Example 2
The high-barrier agent comprises the following components in parts by mass: 10 parts of styrene, 2 parts of butadiene, 20 parts of polybutyl acrylate, 10 parts of polyolefin, 2 parts of isooctyl acrylate and 8 parts of porcelain clay.
The preparation process of the high-barrier agent comprises the following steps: adding 10 parts of styrene and 2 parts of butadiene into a reaction kettle, reacting for 30min at the temperature of 50 ℃ and the pressure of 20MPa, then adding 10-25 parts of polybutyl acrylate, reacting for 115min, then adding 10 parts of polyolefin, reacting for 35min at the same temperature and pressure, then adding 8 parts of china clay (the concentration is 8%), raising the temperature to 180 ℃, reducing the pressure to 10MPa, reacting for 4-6h under the conditions, and taking out the product after the reaction is completely cooled, thus obtaining the high barrier agent.
A preparation method of a high-barrier coated white cardboard comprises the following steps:
(1) pulping: the paperboard basic layer is divided into a surface paper layer, a core paper layer and a bottom paper layer, pulp boards for preparing surface paper layer pulp, core paper layer pulp and bottom paper layer pulp are subjected to size degradation by a D-type hydrapulper, the mass concentration of the size degradation is 3.5-6.5%, screening, pulping and pulp blending are carried out, and the surface paper layer pulp, the core paper layer pulp and the bottom paper layer pulp are respectively prepared;
(2) surfing the Internet: respectively filtering the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry prepared in the step (1) to remove water, and then compounding, wherein the net surfing speed of the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry in the compounding process is 400m/min, so that a compound slurry is obtained, and the overall thickness of the compounded three slurries is 200 mu m;
(3) squeezing to remove water: pressing the composite pulp prepared in the step (2) by using a blind hole press roll at the pressure of 130kN/m, and pressing paper by using a shoe press roll at the pressure of 700 kN/m;
(4) primary drying: drying the composite pulp squeezed and dewatered in the step (3), and drying by adopting a plurality of groups (such as 2-10 groups) of drying cylinders, wherein the drying temperature is increased in a gradient manner (40 ℃ is kept for 30min, 70 ℃ is kept for 25-30min, and 130 ℃ is kept for 15-20 min), the cylinder surface temperature of the drying cylinders is sequentially increased from 50 ℃ to 120 ℃ until the moisture content in the pulp is 6.5 percent, so that the paperboard base layer is obtained;
(5) coating on line in the machine: coating high-barrier agents on two sides of the paperboard base layer prepared in the step (4) in order to improve the surface strength of paper;
(6) and (3) drying again: and (3) drying the paperboard base layer coated with the high-barrier agent in the step (5) by using a hot air box of a paper machine, wherein the drying temperature is 150 ℃, and the speed of the paper machine is 400m/min, so as to obtain the high-barrier coated white paperboard.
The on-line coating process in the machine in the step (5) is improved on the basis of the normal white cardboard process flow, and mainly changes the coating process, and the specific process is as follows: the high-barrier agent is coated on the back and the front (the backing paper layer is the back, and the face paper layer is the front), wherein the back adopts a metering rod, the diameter is 12mm, and the coating amount is 4g/m2The front surface adopts a ceramic wear-resistant scraper with the coating weight of 4g/m2(ii) a After the back coating and the front coating are finished, drying is carried out in a combined mode of infrared drying and hot air drying.
In the step (5), the coating weight of the starch on the front surface and the back surface of the paperboard base layer is 2.0g/m2In the step (5), before coating the high-barrier agent, the starch solution is further coated on two surfaces of the paperboard base layer for surface sizing. The preparation process of the starch solution comprises the following steps: dissolving starch in water at a mass concentration of 20%, steaming in a steamer at a steaming temperatureCooking at 95 deg.C for 30min, and diluting the cooked starch solution to 10% with water.
In the step (1), the surface paper layer slurry is prepared from the following components in parts by mass: 70 parts of bleached hardwood sulfate pulp and 10 parts of bleached softwood sulfate pulp.
In the step (1), the core paper layer slurry is prepared from the following components in parts by mass: 40 parts of chemithermomechanical pulp, 5 parts of bleached hardwood kraft pulp, 10 parts of bleached softwood kraft pulp and 35 parts of broke.
In the step (1), the base paper layer slurry is prepared from the following components in parts by mass: 80 parts of bleached hardwood sulfate pulp and 10 parts of bleached softwood sulfate pulp.
Example 3
The high-barrier agent comprises the following components in parts by mass: 25 parts of styrene, 4 parts of butadiene, 25 parts of polybutyl acrylate, 12 parts of polyolefin, 5 parts of isooctyl acrylate and 15 parts of porcelain clay.
The preparation process of the high-barrier agent comprises the following steps: adding 25 parts of styrene and 45 parts of butadiene into a reaction kettle, reacting for 50min at the temperature of 65 ℃ and the pressure of 20MPa, adding 25 parts of polybutyl acrylate, reacting for 18min, adding 12 parts of polyolefin, reacting for 35min at the same temperature and pressure, adding 15 parts of china clay (the concentration is 6%), raising the temperature to 200 ℃, reducing the pressure to 10MPa, reacting for 5h under the conditions, completely reacting, taking out the product after completely cooling, and obtaining the high-barrier property
A preparation method of a high-barrier coated white cardboard comprises the following steps:
(1) pulping: the paperboard basic layer is divided into a surface paper layer, a core paper layer and a bottom paper layer, pulp boards for preparing surface paper layer pulp, core paper layer pulp and bottom paper layer pulp are subjected to size degradation by a D-type hydrapulper, the mass concentration of the size degradation is 3.5-6.5%, screening, pulping and pulp blending are carried out, and the surface paper layer pulp, the core paper layer pulp and the bottom paper layer pulp are respectively prepared;
(2) surfing the Internet: respectively filtering the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry prepared in the step (1) to remove water, and then compounding, wherein the net surfing speed of the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry in the compounding process is 350m/min, so that a compound slurry is obtained, and the overall thickness of the compound three slurries is 350 mu m;
(3) squeezing to remove water: pressing the composite pulp prepared in the step (2) by using a blind hole press roll at the pressure of 125kN/m, and pressing paper by using a shoe press roll at the pressure of 700 kN/m;
(4) primary drying: drying the composite slurry squeezed and dewatered in the step (3), and drying by adopting a plurality of groups (such as 8 groups) of drying cylinders, wherein the drying temperature is increased in a gradient manner (45 ℃ is kept for 30min, 70 ℃ is kept for 30min, and 130 ℃ is kept for 20 min), the cylinder surface temperature of the drying cylinders is sequentially increased from 50 ℃ to 120 ℃ until the moisture content in the slurry is 8 percent, so that a paperboard base layer is obtained;
(5) coating on line in the machine: coating high-barrier agents on two sides of the paperboard base layer prepared in the step (4) in order to improve the surface strength of paper;
(6) and (3) drying again: and (3) drying the paperboard base layer coated with the high-barrier agent in the step (5) by using a hot air box of a paper machine, wherein the drying temperature is 150 ℃, and the speed of the paper machine is 400m/min, so as to obtain the high-barrier coated white paperboard.
The on-line coating process in the machine in the step (5) comprises the following specific processes: the high-barrier agent is coated on the back and the front (the backing paper layer is the back, and the face paper layer is the front), wherein the back coating adopts a metering rod, the diameter is 12mm, and the coating amount is 12g/m2The front surface is coated with a ceramic wear-resistant scraper with a coating weight of 9g/m2(ii) a After the back coating and the front coating are finished, drying is carried out in a combined mode of infrared drying and hot air drying.
In the step (5), the coating amount of the starch on the back surface of the paperboard base layer is 1.5g/m2The coating weight on the front surface was 2.0g/m2. In the step (5), the starch solution is further coated on the two sides of the paperboard base layer for surface sizing before the high-barrier agent is coated (i.e. the starch solution is coated on the surface of the paperboard base layer). The preparation process of the starch solution comprises the following steps: firstly, dissolving starch in water according to the mass concentration of 20%, steaming the starch in a steamer at the temperature of 90 ℃,cooking time is 20min, and the cooked starch solution is diluted to 10% with water for standby.
In the step (1), the surface paper layer slurry is prepared from the following components in parts by mass: 90 parts of bleached hardwood sulfate pulp and 30 parts of bleached softwood sulfate pulp.
In the step (1), the core paper layer slurry is prepared from the following components in parts by mass: 45 parts of chemithermomechanical pulp, 10 parts of bleached hardwood sulphate pulp, 15 parts of bleached softwood sulphate pulp and 40 parts of broke.
In the step (1), the base paper layer slurry is prepared from the following components in parts by mass: 90 parts of bleached hardwood sulfate pulp and 20 parts of bleached softwood sulfate pulp.
Example 4
The high-barrier agent comprises the following components in parts by mass: 30 parts of styrene, 5 parts of butadiene, 32 parts of polybutyl acrylate, 15 parts of polyolefin, 8 parts of isooctyl acrylate and 28 parts of porcelain clay.
The preparation process of the high-barrier agent comprises the following steps: adding 30 parts of styrene and 5 parts of butadiene into a reaction kettle, reacting for 65min at the temperature of 75 ℃ and the pressure of 25MPa, adding 32 parts of polybutyl acrylate, reacting for 20min, adding 15 parts of polyolefin, reacting for 30-40min at the same temperature and pressure, adding 28 parts of china clay (the concentration is 10%), raising the temperature to 250 ℃, reducing the pressure to 12MPa, reacting for 6h under the condition, and taking out the product after the reaction is completely cooled to obtain the high barrier agent.
A preparation method of a high-barrier coated white cardboard comprises the following steps:
(1) pulping: the paperboard base layer is divided into a surface paper layer, a core paper layer and a bottom paper layer, a pulp board for preparing surface paper layer pulp, core paper layer pulp and bottom paper layer pulp is subjected to size degradation by a D-type hydrapulper, the mass concentration of the size degradation is 6.5%, screening, pulping and pulp blending are carried out, and the surface paper layer pulp, the core paper layer pulp and the bottom paper layer pulp are respectively prepared;
(2) surfing the Internet: respectively filtering the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry prepared in the step (1) to remove water, and then compounding, wherein the net surfing speed of the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry in the compounding process is 500m/min, so that a compound slurry is obtained, and the overall thickness of the compound three slurries is 400 mu m;
(3) squeezing to remove water: pressing the composite pulp prepared in the step (2) by using a blind hole press roll at the pressure of 140kN/m, and pressing paper by using a shoe press roll at the pressure of 720 kN/m;
(4) primary drying: drying the composite slurry squeezed and dewatered in the step (3), and drying by adopting a plurality of groups (such as 5 groups) of drying cylinders, wherein the drying temperature is increased in a gradient manner (40 ℃ is kept for 30min, 70 ℃ is kept for 30min, and 125 ℃ is kept for 20 min), the cylinder surface temperature of the drying cylinders is sequentially increased from 50 ℃ to 120 ℃ until the moisture content in the slurry is 9 percent, so that a paperboard base layer is obtained;
(5) coating on line in the machine: coating a high barrier agent on the back surface of the paperboard base layer prepared in the step (4) in order to improve the surface strength of paper;
(6) and (3) drying again: and (3) drying the paperboard substrate coated with the high-barrier agent in the step (5) by using a hot air box of a paper machine, wherein the drying temperature is 155 ℃, and the speed of the paper machine is 550m/min, so as to obtain the high-barrier coated white paperboard.
The on-line coating process in the machine in the step (5) is improved on the basis of the normal white cardboard process flow, and mainly changes the coating process, and the specific process is as follows: the high-barrier agent is coated on the back surface (the backing paper layer is the back surface), wherein the back surface is coated by a metering rod, the diameter is 12mm, and the coating amount is 15g/m2And then drying by using a combined mode of infrared drying and hot air drying.
In the step (5), the coating amount of starch coated on the back surface of the paperboard base layer is 3.5g/m2. In the step (5), before the high-barrier agent is coated, a starch solution is further coated on the back surface of the paperboard base layer for surface sizing (namely, the starch solution is coated on the surface of the paperboard base layer), and the coating amount of the starch is 3.5g/m2(the coating amount of starch is oven dry amount). The preparation process of the starch solution comprises the following steps: dissolving starch in water at a mass concentration of 20%, and steaming at 95 deg.CThe time is 25min, and the cooked starch solution is diluted to 8% with water for standby.
In the step (1), the surface paper layer slurry is prepared from the following components in parts by mass: 100 parts of bleached hardwood sulfate pulp and 35 parts of bleached softwood sulfate pulp.
In the step (1), the core paper layer slurry is prepared from the following components in parts by mass: 50 parts of chemithermomechanical pulp, 12 parts of bleached hardwood kraft pulp, 18 parts of bleached softwood kraft pulp and 45 parts of broke.
In the step (1), the base paper layer slurry is prepared from the following components in parts by mass: 100 parts of bleached hardwood sulfate pulp and 20 parts of bleached softwood sulfate pulp.
Example 5
Using base paper as 230g/m2On the basis, according to the technical scheme of the invention, the back coating weight of the prepared high-barrier agent is 12g/m2The product of (1) is numbered as group A; the back coating weight of the high barrier agent is 12g/m2The coating weight of the front surface is 9g/m2The product number of (1) is a product of group B; the back PE laminating paperboard is also prepared, and the back laminating amount is 24g/m2Numbered as group C; the double-sided PE laminating paperboard has the back laminating amount of 24g/m2The front side film coating amount is 12g/m2And the number is D group. A. B, C, D groups tested under the same conditions were the indices: air permeability, which is measured in units of (mL/min) of the air permeability values of the front and back sides of the paper, respectively; the preparation process of the group E (as a comparison group) is the same as that of the group A, but the group E is not dried in a mode of combining infrared drying and hot air drying; water absorption value, test 10min, water absorption value of 20min, unit is (gsm); hot water seeping at the same time, unit (kg/m)2) (ii) a The unit of water vapor permeability in mm of coffee and the unit of water vapor permeability in g/m2Day), heat sealing effect, hot water leakage (100 ℃ for hot water), coffee leakage, oil-water leakage, wherein the heat sealing effect, hot water leakage, coffee leakage, and oil-water leakage are measured in 48 hours, O means no-test, + means no-test, and, + means good test effect, and the results are shown in table 1.
TABLE 1
As can be seen from the data in table 1, the product of the present invention has equal or better performance compared to PE laminated paperboard. It can also be seen from table 1 that the high barrier coating weight of the present invention can be significantly saved when the effect is equivalent, which greatly reduces the production cost. In addition, if the product of the invention adopts back coating, the product is particularly suitable for being made into cold paper cups.
In addition, compared with the traditional PE laminating papermaking, the weight is 230g/m2For example, in the PE lamination papermaking process, 20g of the high-barrier agent needs to be laminated on the base paper to achieve a good barrier effect, but the same barrier effect can be achieved only by coating 10g of the high-barrier agent in the papermaking process. And the thickness of the paper manufactured by the two processes is different, the paper manufactured by the invention can greatly reduce the inventory and transportation cost, and the high-barrier paper with the same area is manufactured, compared with the traditional PE laminating paper-making technology, the technical scheme of the invention can save 25-40% of transportation cost and 15-25% of inventory cost.
In addition, the high-barrier coated white cardboard can be naturally degraded and is very environment-friendly, if the high-barrier coated white cardboard is recycled, the recycling cost can be reduced by 20-40% compared with the recycling cost of the traditional PE laminating paper, and the traditional PE laminating paper cannot be naturally degraded and is not beneficial to environmental protection.
Claims (7)
1. A preparation method of a high-barrier coated white cardboard is characterized by comprising the following steps:
(1) pulping: after the pulp board is pulped by a pulper, screening, pulping and pulp mixing are carried out, and surface paper layer pulp, core paper layer pulp and bottom paper layer pulp are respectively prepared;
(2) surfing the Internet: respectively filtering the surface paper layer slurry, the core paper layer slurry and the bottom paper layer slurry prepared in the step (1) to obtain a composite slurry with the thickness of 150-;
(3) squeezing to remove water: the composite pulp prepared in the step (2) is firstly pressed by a blind hole pressing roll with the pressure of 120-720 kN/m, and then the paper is pressed by a shoe pressing roll with the pressure of 680-720 kN/m;
(4) primary drying: drying the composite slurry squeezed and dewatered in the step (3) until the water content in the slurry is 5-12% to obtain a paperboard base layer;
(5) coating on line in the machine: coating a high-barrier agent on at least one of the two surfaces of the paperboard base layer prepared in the step (4), and drying in a combined mode of infrared drying and hot air drying after coating;
(6) and (3) drying again: drying the paperboard base layer coated with the high-barrier agent in the step (5) to obtain high-barrier coated white paperboard;
the high-barrier agent in the step (5) comprises the following components in parts by mass: 8-30 parts of styrene, 1-5 parts of butadiene, 8-32 parts of polybutyl acrylate, 7-15 parts of polyolefin, 1-8 parts of isooctyl acrylate and 5-28 parts of porcelain clay.
2. A method for preparing a high-barrier coated ivory board according to claim 1, wherein in the step (5), before coating the high-barrier agent, a starch solution is further coated on at least one of the two surfaces of the paperboard substrate, and the coating amount of starch is 1.5-3.5g/m2。
3. A method for preparing the high-barrier coated ivory board according to claim 2, wherein the starch solution is prepared by the following steps: dissolving starch in water at a mass concentration of 18-22%, steaming at 90-100 deg.C for 20-30min, and diluting the starch solution to 5-15% with water.
4. The method for preparing the high-barrier coated ivory board according to claim 1, wherein the drying temperature in the step (4) is increased in a gradient manner, and the specific process is as follows: maintaining at 25-50 deg.C for 30min, 50-80 deg.C for 25-30min, and 80-130 deg.C for 15-20 min.
5. The method for preparing a high-barrier coated ivory board according to claim 1, wherein the step (5) of coating the high-barrier agent is one-side coating or two-side coating, and the coating amount of the front side of the one-side coating is 0g/m2The back coating weight is 3-15g/m2(ii) a The coating weight of the front surface of the double-sided coating is 1-10g/m2The back coating weight is 3-15g/m2。
6. The method for preparing the high-barrier coated ivory board according to claim 1, wherein the specific process of the on-line coating in the step (5) is as follows: the high-barrier agent is coated on the back and/or the front, wherein the back coating adopts a metering rod, and the coating amount is 3-15g/m2The front coating adopts a ceramic wear-resistant scraper, and the coating weight is 1-10g/m2。
7. The method for preparing the high-barrier coated ivory board as claimed in claim 1, wherein the step (6) is carried out by using a hot air box of a paper machine, wherein the drying temperature is 140-.
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| CN111691237A (en) * | 2020-06-19 | 2020-09-22 | 湖北骏马纸业有限公司 | Production process of high-barrier coated white cardboard |
| CN112314632A (en) * | 2020-07-28 | 2021-02-05 | 珠海红塔仁恒包装股份有限公司 | Long-acting bacteriostatic agent, white cardboard and preparation method thereof |
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