CN111088724A - Coated kraft liner board for bundling package and processing technology thereof - Google Patents
Coated kraft liner board for bundling package and processing technology thereof Download PDFInfo
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- CN111088724A CN111088724A CN201911374110.3A CN201911374110A CN111088724A CN 111088724 A CN111088724 A CN 111088724A CN 201911374110 A CN201911374110 A CN 201911374110A CN 111088724 A CN111088724 A CN 111088724A
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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
- D21H27/10—Packing paper
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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
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/28—Starch
- D21H17/29—Starch cationic
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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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/62—Rosin; 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
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/385—Oxides, hydroxides or carbonates
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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
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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
-
- 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
- D21H19/82—Paper comprising more than one coating superposed
-
- 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
-
- 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
- D21H21/16—Sizing or water-repelling agents
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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
- 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
- D21H21/18—Reinforcing agents
- D21H21/20—Wet strength agents
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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
- D21H27/30—Multi-ply
Abstract
The invention discloses a coated craft paper for bundling package and a processing technology thereof, wherein the coated craft paper comprises a front coating layer, a surface layer, a lining layer, a core layer and a bottom layer, wherein the surface layer, the lining layer, the core layer and the bottom layer are of a four-layer fiber structure; the surface layer and the lining layer are bleached chemical wood pulp layers, and the front coating layer, the surface layer, the lining layer, the core layer and the bottom layer are 7-15, 10-25, 30-45 and 10-25 mass percent of paper pulp; the front coating is subjected to three-time coating feeding, the total coating weight is 22-35 g/m2, and the gloss of the printed surface is ensured; the coating in the front coating is calcium carbonate, china clay, calcined soil, latex, CMC, a lubricant and a water repellent agent; the positive adoption is favorable to improving the superimposed structure of surface course and the lining of positive intensity, replaces traditional one deck positive thick liquid layer, can increase positive chemical pulp layer gram weight more than traditional structure, plays the paper characteristic of positive higher strength, guarantees that two-layer elasticity can be unanimous, effectively combines, and the surface course is joined in marriage the long fiber proportion in the thick liquid with the lining and is high, can effectively improve paper positive intensity.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to a papermaking technology, in particular to a coated craft paper for bundling and packaging and a processing technology thereof.
[ background of the invention ]
Along with economic development and improvement of living standard, the bundling package is widely applied to the food fields of beer, beverage, dairy products and the like so as to flexibly meet various packaging requirements, reduce transportation space and reduce transportation cost. However, in the current market, the bundling package mostly adopts shrink films, the influence of plastic garbage on the environment is increasingly large, the global plastic reduction and plastic limitation challenge is more and more severe, and therefore, the plastic is replaced by paper to become the environment requirement.
Coated kraft liner boards are also used in bundling bags in the market, and the coated kraft liner boards for bundling packaging are made of pure wood as a raw material and are compounded by hardwood short fiber white pulp with broad-leaved trees as the raw material on the surface layer. The paperboard is mainly divided into three layers, namely a surface layer, a core layer and a bottom layer, and the paperboard keeps the high tearing strength and the high toughness of the craft paper and has good printability of the white cardboard. But also meets the hygienic standard of direct contact with food. However, because the coated craft paper for the cluster packaging needs to bear higher weight, the craft paper still has unreasonable proportion and thickness of each wood pulp layer, and various performances of the coated craft paper for the cluster packaging are not ideal, so that the forming performance of the paper is poor, the strength and the stiffness of the paper are not high enough, the integral tearing strength of the coated craft paper is not high enough, and the strength loss is large particularly in a wet state of a freezer.
[ summary of the invention ]
The invention meets the special requirements of frozen and refrigerated foods on the performance of packaging materials in the processes of storage and transportation, and provides the coated kraft liner board for bundling packaging and the processing technology thereof, wherein the coated kraft liner board has the advantages of good structural strength and moisture resistance, good forming performance, high stiffness and high wet strength, high cost performance, high stiffness in a humid environment and capability of effectively saving fiber resources.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a coating craft paper for bundling package comprises a front coating layer, a surface layer, a lining layer, a core layer and a bottom layer which are sequentially connected, wherein the surface layer, the lining layer, the core layer and the bottom layer are of four-layer fiber structures, the front surface adopts a structure of overlapping the surface layer and the lining layer which is beneficial to improving the strength of the front surface, the gram weight of a front surface chemical pulp layer can be increased more than that of a traditional front surface one-layer structure, and the characteristic of a paper surface with higher strength of the front surface is achieved; the surface layer and the lining layer are bleached chemical wood pulp layers, the core layer is 100% natural color high-yield long fiber hot-grinding mechanical pulp, and the bottom layer is 100% natural color long fiber chemical pulp; the front coating layer, the surface layer, the lining layer, the core layer and the bottom layer paper pulp account for 7-15 percent, 10-25 percent, 30-45 percent and 10-25 percent by mass; the front coating is formed by three times of coating feeding, the total coating weight is 22-35 g/m2, and the coating in the front coating comprises calcium carbonate, china clay, calcined soil, latex, CMC, a lubricant and a water repellent agent.
Further, the mass percentages of the calcium carbonate, the china clay, the calcined soil, the latex, the CMC, the lubricant and the water repellent agent in the coating are 50-100: 0.5-30: 0.5-20: 15-20: 0.5-1.5: 0.2-0.6, in the coating formula, the mass percentage of the calcium carbonate, the china clay and the calcined soil is 100%, and the latex, the CMC, the lubricant and the water repellent agent are additionally added according to needs.
Furthermore, the surface layer and the lining layer adopt long fiber chemical pulp and short fiber chemical pulp with the same ratio, the mass percentage ratio of the long fiber chemical pulp to the short fiber chemical pulp is 50-80: 50-20, and the beating degree is 20-32 DEG SR; the front surface adopts a structure of overlapping a surface layer and a lining layer which are favorable for improving the strength of the front surface, replaces a traditional front surface slurry layer, ensures that the two layers have consistent telescopic performance and are effectively combined; in addition, in the pulp mixing proportion of the surface layer and the lining layer, the long fiber proportion is high, and the front strength of the paper can be effectively improved.
Furthermore, the long fiber chemical pulp adopted in the surface layer and the lining layer is bleached sulfate coniferous long fiber pulp, and the short fiber chemical pulp adopted in the surface layer and the lining layer is bleached sulfate broadleaf short fiber pulp.
Further, the beating degree of the 100% natural-color high-yield long fiber thermomechanical pulp in the core layer after the defibering and light beating is 10-35 DEG SR.
Further, the beating degree of 100% of natural color long fiber chemical pulp in the bottom layer is 26-40 DEG SR; the bottom layer can resist food content packaging bottles and obtain enough high support strength without damage when packaged in a bundle.
A processing technology of coated craft paper for bundling package comprises the following steps:
step one, pulp boards of surface layer, lining layer, core layer and bottom layer pulp are respectively proportioned and placed into a pulper to be pulped and dispersed into pulp;
removing heavy impurities by a sand remover;
thirdly, feeding the mechanical pulp of the core layer into a defibering and mild grinding machine to defiber coarse fiber bundles in the pulp, grinding other layers of chemical pulp to fuzz and brood fibers by disc grinding, and then removing a sizing system of a paper machine;
step four, in a paper machine sizing system, passing pulp through a pulp preparation pool, entering a paper machine pulp pool, a first-stage four-section desander, a fan pump, a pressure screen and a pulp flow box, then entering a net, and sequentially entering net for dehydration, three-pass pressing, drying, surface sizing, drying, hard calendaring, three-time coating on the front surface, soft calendaring and rolling into paper;
wherein the quantitative range of the paper is 200g/m 2-400 g/g/m 2; in a sizing system of a paper machine, cationic starch is added into paper for high in-pulp reinforcement and sizing treatment, the addition amount of the cationic starch is 20-60 KG/ton of the paper, a wet strengthening agent is added to perform high wet strength treatment on the paper, and high molecular low molecular binary retention is adopted before wire feeding to ensure the retention rate of various chemicals and sizing agents on the paper; the front surface of the paper is coated for three times, so that the gloss of the printing surface is ensured, and the paper is suitable for offset printing, gravure printing and flexo printing.
Further, the core layer uses 100% natural-color high-yield long fiber thermomechanical pulp, and adopts a defibering and defibering mode which is used for avoiding excessive thick fiber bundles and is formed by pulp breaking, screening and purifying, defibering and light mill dissociation to obtain core layer pulp; the fiber is not prone to having too much thick fiber bundles, unevenness of a paper surface caused by the thick fiber bundles is avoided, the fiber is not excessively cut off, the fiber bundles are maximally separated, and the core layer is guaranteed to have high bulk and strength.
Furthermore, the addition amount of the wet reinforcing agent is 15-35 KG/ton, so that the bundling packaging paper can have a long-time moisture-resistant effect when being placed in a freezer; and simultaneously meets the requirements of a food safety system. Paper.
Further, rosin acid sizing is adopted in the sizing treatment, and the addition amount of the rosin is 15-35 KG/ton of paper; thereby ensuring that the front, back and cross sections of the paper have higher anti-water absorption effect.
The invention has the beneficial effects that:
according to the characteristics required by the application of the bundling bag, the front side adopts a structure of overlapping a surface layer and a lining layer which are beneficial to improving the strength of the front side, the gram weight of a front side chemical pulp layer can be increased more than that of a traditional front side one-layer structure, the quality is improved pertinently, and the characteristic of a paper surface with higher strength of the front side is achieved; moreover, the bulk is ultrahigh, and compared with other paper with the same gram weight, the paper has higher thickness and higher stiffness; the beating degree of 100 percent of natural color long fiber chemical pulp in the bottom layer is 26-40 DEG SR; the bottom layer can resist food content packaging bottles and obtain high enough supporting strength without damage when packaged in a bundle, and compared with other paper with the same thickness, the packaging paper can reduce gram weight, reduce fiber consumption, reduce transportation weight, save energy and protect environment.
Moreover, the front surface of the paper is coated with good paper surface smoothness for three times, the gloss of the printing surface is ensured, and the printing paper is suitable for various printing processes such as offset printing, gravure printing, flexo printing and the like; in a sizing system of a paper machine, cationic starch is added into paper for high pulp internal reinforcement and sizing treatment, the addition amount of the cationic starch is 20-60 KG/ton of paper, and a wet reinforcing agent is added for high wet strength treatment of the paper, so that the paper has outstanding front layer compressive tear strength, outstanding moisture resistance strength and water absorption strength, and the cold storage damage is reduced. Meanwhile, although the paper has higher wet strength resistance, the paper can still be naturally degraded, and the environment cannot be influenced.
[ description of the drawings ]
FIG. 1 is a schematic representation of the layered structure of the paper of the present invention.
[ detailed description ] embodiments
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.
Example one
In this embodiment, the coated craft paper for bundle packaging with a paper basis weight of 250g/m2 includes a front coating layer 1, a surface layer 2, a lining layer 3, a core layer 4 and a bottom layer 5 which are sequentially connected as shown in fig. 1, wherein the surface layer 2, the lining layer 3, the core layer 4 and the bottom layer 5 are of a four-layer fiber structure, the front surface adopts a structure of overlapping the surface layer and the lining layer which is beneficial to improving the front strength, the surface layer and the lining layer adopt long fiber chemical pulp and short fiber chemical pulp which are in the same proportion, the long fiber chemical pulp adopted in the surface layer and the lining layer is bleached sulfate needle-leaf long fiber pulp, and the short fiber chemical pulp adopted in the surface layer and the lining layer is bleached sulfate broad-leaf short; compared with the traditional front surface one-layer structure, the gram weight of the front surface chemical pulp layer can be increased more, and the paper surface characteristic of higher strength of the front surface is achieved; the surface layer and the lining layer are bleached chemical wood pulp layers, the core layer is 100 percent of natural color high-yield long fiber hot-grinding mechanical pulp, and the bottom layer is 100 percent of natural color long fiber chemical pulp; the front coating is three-time coating material feeding, the total coating weight is 25g/m2, and the coating in the front coating comprises calcium carbonate, china clay, calcined clay, latex, CMC, a lubricant and a water repellent agent.
The mass percentage of the front coating layer, the surface layer, the lining layer, the core layer and the bottom layer paper pulp is 10: 12: 45: 21; the mass percentages of the calcium carbonate, the china clay, the calcined soil, the latex, the CMC, the lubricant and the water repellent agent in the coating are 60: 20: 15: 1.0: 0.3: 0.4, in the coating formula, the mass percentages of the calcium carbonate, the china clay and the calcined soil are 100%, and the latex, the CMC, the lubricant and the water repellent agent are additionally added according to the requirements.
Wherein the mass percentage ratio of the long fiber chemical pulp to the short fiber chemical pulp in the surface layer and the lining layer is 50: 50, and the beating degree is 26 DEG SR; the front surface adopts a structure of overlapping a surface layer and a lining layer which are favorable for improving the strength of the front surface, replaces a traditional front surface slurry layer, ensures that the two layers have consistent telescopic performance and are effectively combined; in addition, in the pulp mixing proportion of the surface layer and the lining layer, the long fiber proportion is high, and the front strength of the paper can be effectively improved.
The core layer uses 100% natural-color high-yield long fiber thermo-milling mechanical pulp, and adopts a defibering and defibering mode of pulping dissociation, screening purification, defibering and light mill dissociation to avoid the existence of too many thick fiber bundles, so as to obtain core layer pulp; the beating degree of 100 percent of natural-color high-yield long fiber thermomechanical pulp in the core layer after the defibering and light pulping is 28 DEG SR. The fiber is not prone to having too much thick fiber bundles, unevenness of a paper surface caused by the thick fiber bundles is avoided, the fiber is not excessively cut off, the fiber bundles are maximally separated, and the core layer is guaranteed to have high bulk and strength.
The beating degree of 100 percent of natural color long fiber chemical pulp in the bottom layer is 30 DEG SR; the bottom layer can resist food content packaging bottles and obtain enough high support strength without damage when packaged in a bundle.
The core layer uses 100% natural-color high-yield long fiber thermo-milling mechanical pulp, and adopts a defibering and defibering mode of pulping dissociation, screening purification, defibering and light mill dissociation to avoid the existence of too many thick fiber bundles, so as to obtain core layer pulp; the fiber is not prone to having too much thick fiber bundles, unevenness of a paper surface caused by the thick fiber bundles is avoided, the fiber is not excessively cut off, the fiber bundles are maximally separated, and the core layer is guaranteed to have high bulk and strength.
The paper is treated by high wet strength, and the addition amount of the wet strengthening agent is 15 KG/ton of paper, so that the bundling packaging paper can have a long-time wet-resistant effect when being placed in a freezer; and simultaneously meets the requirements of a food safety system.
The paper is treated by high internal sizing, wherein the sizing treatment adopts rosin acid sizing, and the addition amount of the rosin is 15 KG/ton of paper; thereby ensuring that the front, back and cross sections of the paper have higher anti-water absorption effect.
In this embodiment, the processing technology of the coated craft paper for bundle packaging with the paper basis weight of 250g/m2 comprises the following steps:
step one, preparing the surface layer, the lining layer, the core layer and each layer of pulp board of the bottom layer pulp according to the proportion, and pulping and dispersing the mixture into pulp in a pulper;
removing heavy impurities by a sand remover;
thirdly, feeding the mechanical pulp of the core layer into a defibering and mild grinding machine to defiber coarse fiber bundles in the pulp, grinding other layers of chemical pulp to fuzz and brood fibers by disc grinding, and then removing a sizing system of a paper machine;
step four, in a paper machine sizing system, passing pulp through a pulp preparation pool, entering a paper machine pulp pool, a first-stage four-section desander, a fan pump, a pressure screen and a pulp flow box, then entering a net, and sequentially entering net for dehydration, three-pass pressing, drying, surface sizing, drying, hard calendaring, three-time coating on the front surface, soft calendaring and rolling into paper;
in a sizing system of a paper machine, adding 30 KG/ton of cationic starch into paper for high pulp internal reinforcement and sizing treatment, adding a wet reinforcing agent for high wet strength treatment of the paper, and adopting high-molecular low-molecular binary retention to ensure the retention rate of various chemicals and pulp on paper before surfing the net; the front surface of the paper is coated for three times, so that the gloss of the printing surface is ensured, and the paper is suitable for offset printing, gravure printing and flexo printing.
In this example, the quality data of the finished paper is as follows:
| item | Unit of | Data of |
| 1. Quantification of | g/m2 | 252 |
| 2. Thickness of | μm | 378 |
| 3. Printing surface roughness (10kgf) | μm | 1.15 |
| 4. Stiffness (longitudinal/transverse) | mN.m | 17/7.8 |
| 5. Surface Water absorption value (60 seconds) | g/m2 | 24/21 |
| 6. Dry tear strength | mN | 3400 |
| 7. Wet tear strength | mN | 2250 |
| 8. Wet to dry tear ratio | ％ | 66％ |
| 9. Interlayer bonding strength | J/m2 | 213 |
Example two
In this example, the coated craft paper for bundle pack having a basis weight of 325g/m2 is different from the first example in that the front coating layer is a triple coating charge, the total coating amount is 32g/m2, and the coating material in the front coating layer includes calcium carbonate, china clay, calcined clay, latex, CMC, lubricant and water repellent.
The mass percentages of the front coating layer, the surface layer, the lining layer, the core layer and the bottom layer paper pulp are 10: 15: 45: 15; the mass percentages of the calcium carbonate, the china clay, the calcined soil, the latex, the CMC, the lubricant and the water repellent agent in the coating are 60: 25: 15: 18: 1.0: 0.5: 0.6, in the coating formula, the mass percentages of the calcium carbonate, the china clay and the calcined soil are 100%, and the latex, the CMC, the lubricant and the water repellent agent are additionally added according to the requirements.
Wherein, the mass percentage ratio of the long fiber chemical pulp to the short fiber chemical pulp in the surface layer and the lining layer is 60: 40, and the beating degree is 25 DEG SR. The beating degree of 100% natural-color high-yield long fiber thermomechanical pulp in the core layer after the defibering and light beating is 20 DEG SR, and the beating degree of 100% natural-color long fiber chemical pulp in the bottom layer is 40 DEG SR. The paper is treated by high wet strength, the addition amount of the wet strengthening agent is 25 KG/ton paper, the paper is treated by high internal sizing, the sizing treatment adopts rosin acid sizing, and the addition amount of the rosin is 23 KG/ton paper.
In the embodiment, the processing technology of the coated kraft paper for bundle packaging with the paper weight of 325g/m2 comprises the following steps:
step one, pulp boards of surface layer, lining layer, core layer and bottom layer pulp are respectively proportioned according to the above proportion and are put into a pulper to be pulped and dispersed into pulp;
removing heavy impurities by a sand remover;
thirdly, feeding the mechanical pulp of the core layer into a defibering and mild grinding machine to defiber coarse fiber bundles in the pulp, grinding other layers of chemical pulp to fuzz and brood fibers by disc grinding, and then removing a sizing system of a paper machine;
step four, in a paper machine sizing system, passing pulp through a pulp preparation pool, entering a paper machine pulp pool, a first-stage four-section desander, a fan pump, a pressure screen and a pulp flow box, then entering a net, and sequentially entering net for dehydration, three-pass pressing, drying, surface sizing, drying, hard calendaring, three-time coating on the front surface, soft calendaring and rolling into paper;
in a sizing system of a paper machine, cationic starch is added to paper for high in-pulp strengthening and sizing treatment, a wet strengthening agent is added to perform high wet strength treatment on the paper, and high-molecular low-molecular binary retention is adopted before web surfing to ensure the retention rate of various chemicals and sizing agents on paper sheets; the front surface of the paper is coated for three times, so that the gloss of the printing surface is ensured, and the paper is suitable for offset printing, gravure printing and flexo printing.
In this example, the quality data of the finished paper is as follows:
| item | Unit of | Data of |
| 1. Quantification of | g/m2 | 322 |
| 2. Thickness of | μm | 469 |
| 3. Printing surface roughness (10kgf) | μm | 1.25 |
| 4. Stiffness (longitudinal/transverse) | mN.m | 24/9.5 |
| 5. Surface Water absorption value (60 seconds) | g/m2 | 23/19 |
| 6. Dry tear strength | mN | 5567 |
| 7. Wet tear strength | mN | 4183 |
| 8. Wet to dry tear ratio | ％ | 75％ |
| 9. Interlayer bonding strength | J/m2 | 221 |
EXAMPLE III
In this example, the coated craft paper for bundle packaging with a paper basis weight of 380g/m2 is different from the first example in that the front coating is three-time coating material, the total coating weight is 30g/m2, and the coating in the front coating is calcium carbonate, china clay, calcined clay, latex, CMC, lubricant and water repellent.
The front coating layer, the surface layer, the lining layer, the core layer and the bottom layer paper pulp account for 8, 18, 38 and 20 mass percent; the mass percentages of the calcium carbonate, the china clay, the calcined soil, the latex, the CMC, the lubricant and the water repellent agent in the coating are 80: 15: 5: 10: 1.5: 0.6, in the coating formula, the mass percentages of the calcium carbonate, the china clay and the calcined soil are 100%, and the latex, the CMC, the lubricant and the water repellent agent are additionally added according to the requirements.
Wherein, the mass percentage ratio of the long fiber chemical pulp to the short fiber chemical pulp in the surface layer and the lining layer is 80: 20, and the beating degree is 32 DEG SR. The beating degree of 100% natural-color high-yield long fiber thermomechanical pulp in the core layer after the defibering and light beating is 35 DEG SR, and the beating degree of 100% natural-color long fiber chemical pulp in the bottom layer is 26 DEG SR. The paper is treated by high wet strength, the addition amount of the wet strengthening agent is 30 KG/ton paper, the paper is treated by high internal sizing, rosin is adopted in sizing treatment, and the addition amount of the rosin is 28 KG/ton paper.
In this embodiment, the processing technology of the coated craft paper for bundle packaging with the paper weight of 380g/m2 comprises the following steps:
step one, pulp boards of surface layer, lining layer, core layer and bottom layer pulp are respectively proportioned according to the above proportion and are put into a pulper to be pulped and dispersed into pulp;
removing heavy impurities by a sand remover;
thirdly, feeding the mechanical pulp of the core layer into a defibering and mild grinding machine to defiber coarse fiber bundles in the pulp, grinding other layers of chemical pulp to fuzz and brood fibers by disc grinding, and then removing a sizing system of a paper machine;
step four, in a paper machine sizing system, passing pulp through a pulp preparation pool, entering a paper machine pulp pool, a first-stage four-section desander, a fan pump, a pressure screen and a pulp flow box, then entering a net, and sequentially entering net for dehydration, three-pass pressing, drying, surface sizing, drying, hard calendaring, three-time coating on the front surface, soft calendaring and rolling into paper;
wherein the basis weight of the paper is 380g/m 2; in a sizing system of a paper machine, cationic starch is added into paper for high in-pulp strengthening and sizing treatment, a wet strengthening agent is added for high wet strength treatment of the paper, and high molecular low molecular binary retention is adopted before web surfing to ensure retention rates of various chemicals and sizing agents on paper sheets; the front surface of the paper is coated for three times, so that the gloss of the printing surface is ensured, and the paper is suitable for offset printing, gravure printing and flexo printing.
In this example, the quality data of the finished paper is as follows:
| item | Unit of | Data of |
| 1. Quantification of | g/m2 | 380 |
| 2. Thickness of | μm | 610 |
| 3. Printing surface roughness (10kgf) | μm | 1.45 |
| 4. Stiffness (longitudinal/transverse) | mN.m | 43/16 |
| 5. Surface Water absorption value (60 seconds) | g/m2 | 25/23 |
| 6. Dry tear strength | mN | 6967 |
| 7. Wet tear strength | mN | 5000 |
| 8. Wet to dry tear ratio | ％ | 72％ |
| 9. Interlayer bonding strength | J/m2 | 185 |
Through the above three examples, the following specific results were obtained:
the above-mentioned embodiments are merely preferred embodiments of the present invention, and not intended to limit the scope of the invention, and all equivalent changes in shape, structure and principle of the invention should be covered by the protection scope of the present invention.
Claims (10)
1. A coated craft paper for bundling and packaging is characterized by comprising a front coating layer, a surface layer, a lining layer, a core layer and a bottom layer which are sequentially connected,
the surface layer, the lining layer, the core layer and the bottom layer are of four-layer fiber structures, and the front surface adopts a structure of superposing the surface layer and the lining layer which is beneficial to improving the strength of the front surface;
the surface layer and the lining layer are bleached chemical wood pulp layers, the core layer is 100% natural color high-yield long fiber hot-grinding mechanical pulp, and the bottom layer is 100% natural color long fiber chemical pulp;
the front coating layer, the surface layer, the lining layer, the core layer and the bottom layer paper pulp account for 7-15 mass percent, 10-25 mass percent, 30-45 mass percent and 10-25 mass percent;
the front coating is formed by three times of coating feeding, the total coating weight is 22-35 g/m2, and the coating in the front coating comprises calcium carbonate, china clay, calcined soil, latex, CMC, a lubricant and a water repellent agent.
2. The coated craft paper for bundling package according to claim 1, wherein the mass percentage of the calcium carbonate, the china clay, the calcined soil, the latex, the CMC, the lubricant and the water repellent agent in the coating is 50-100: 0.5-30: 0.5-20: 15-20: 0.5-1.5: 0.2-0.6.
3. The coated craft paper for bundling and packaging according to claim 1, wherein the surface layer and the lining layer are made of long fiber chemical pulp and short fiber chemical pulp in the same ratio, the mass ratio of the long fiber chemical pulp to the short fiber chemical pulp is 50-80: 50-20, and the beating degree is 20-32 ° SR.
4. The coated kraft paper for bundle packaging according to claim 3, wherein the long fiber chemical pulp used in the face layer and the lining layer is bleached sulfate conifer long fiber pulp, and the short fiber chemical pulp used in the face layer and the lining layer is bleached sulfate broadleaf short fiber pulp.
5. The coated kraft paper for bundle packaging according to claim 1, wherein the degree of beating after the defibering and lightly beating of 100% unbleached high-yield long fiber thermomechanical pulp in the core layer is 10-35 ° SR.
6. The coated kraft paper for bundle packaging according to claim 1, wherein the beating degree of the 100% unbleached long fiber chemical pulp in the bottom layer is 26-40 ° SR.
7. A processing technology of coated craft paper for bundling and packaging is characterized by comprising the following steps:
step one, pulp boards of surface layer, lining layer, core layer and bottom layer pulp are respectively proportioned and placed into a pulper to be pulped and dispersed into pulp;
removing heavy impurities by a sand remover;
thirdly, feeding the mechanical pulp of the core layer into a defibering and mild grinding machine to defiber coarse fiber bundles in the pulp, grinding other layers of chemical pulp to fuzz and brood fibers by disc grinding, and then removing a sizing system of a paper machine;
step four, in a paper machine sizing system, passing pulp through a pulp preparation pool, entering a paper machine pulp pool, a first-stage four-section desander, a fan pump, a pressure screen and a pulp flow box, then entering a net, and sequentially entering net for dehydration, three-pass pressing, drying, surface sizing, drying, hard calendaring, three-time coating on the front surface, soft calendaring and rolling into paper;
wherein the paper quantitative range is 200g/m2～400g/g/m2(ii) a In a sizing system of a paper machine, cationic starch is added into paper for high in-pulp reinforcement and sizing treatment, the addition amount of the cationic starch is 20-60 KG/ton of paper, a wet reinforcing agent is added for high wet strength treatment of the paper, and high molecular low molecular binary retention is adopted before wire feeding to ensure the retention rate of various chemicals and sizing agents on the paper.
8. The coated kraft paper process for bundle packaging of claim 7, wherein the core layer uses 100% unbleached high yield long fiber thermomechanical pulp in defibration mode avoiding the presence of too many coarse fiber bundles, such as pulp disintegration, screen cleaning, defibration and defibration with a light mill, to obtain the core layer pulp.
9. The process according to claim 7, wherein the wet strength agent is added in an amount of 15-35 KG/ton of paper.
10. The coated craft paper processing technology for bundle packaging according to claim 7, further comprising: the sizing treatment adopts rosin acid sizing, and the addition amount of the rosin is 15-35 KG/ton of paper.
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| CN112553948A (en) * | 2020-10-22 | 2021-03-26 | 宁波亚洲浆纸业有限公司 | Card paper and production method thereof |
| CN114481659A (en) * | 2022-01-05 | 2022-05-13 | 山东太阳宏河纸业有限公司 | High-strength craft paper and production process thereof |
| CN116876260A (en) * | 2023-06-19 | 2023-10-13 | 珠海红塔仁恒包装股份有限公司 | Double-sided wood-like packaging paper and preparation method and application thereof |
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