CN112160189A - Wrapping paper and preparation method and application thereof - Google Patents
Wrapping paper and preparation method and application thereof Download PDFInfo
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- CN112160189A CN112160189A CN202011056911.8A CN202011056911A CN112160189A CN 112160189 A CN112160189 A CN 112160189A CN 202011056911 A CN202011056911 A CN 202011056911A CN 112160189 A CN112160189 A CN 112160189A
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- paper
- glue solution
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- sulfate
- glue
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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
-
- 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
- D21H17/63—Inorganic compounds
- D21H17/66—Salts, e.g. alums
-
- 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
Abstract
The invention belongs to the technical field of papermaking, and particularly relates to packaging paper and a preparation method and application thereof. The surface of one side or two sides of the packing paper provided by the invention is provided with a sizing material layer; the glue layer is formed by coating and drying glue solution, and the glue solution comprises the following components in percentage by mass: 3-25% of metal salt; 1-20% of an organic adhesive; 0-10% of a sizing agent; 70-90% of water; the metal salt is a normal salt and comprises one or more of hydrochloride, sulfate and nitrate; the organic adhesive comprises one or more of starch, carboxymethyl cellulose, methyl cellulose and polyvinyl alcohol. According to the invention, the sizing material layer with specific components is arranged on the surface of the packaging paper, so that the sizing material layer can improve the surface energy of the paper while improving the basic functions of the paper such as liquid resistance, mechanical strength and smoothness, and the like, thereby improving the adhesive strength between the surface of the paper and PE.
Description
Technical Field
The invention belongs to the technical field of papermaking, and particularly relates to packaging paper and a preparation method and application thereof.
Background
In food packaging paper processing, in order to achieve the purpose of separating contents from paper, a material with a separating effect is generally required to be bonded on the surface of raw paper. For example, wrapping paper used for paper cups, lunch boxes, paper bowls/buckets for food, cold-can roof bags (pasteurized milk packages), etc. usually requires Polyethylene (PE) film coating treatment on the surface of the base paper; in liquid packaging paper and hot-can roof packaging paper used for milk/beverage and the like, a PE film is generally coated on the surface of base paper, and then aluminum foil is compounded. In any processing, the surface of the raw paper of the food packaging paper needs to be bonded with a PE material, the bonding strength between PE and the paper needs to be high enough, otherwise, PE film delamination is easy to occur, and the leakage of contents in food packaging is caused.
PE bonding of paper, usually PE in a molten state, is applied directly to the paper surface. One of the necessary prerequisites for achieving good adhesion of PE to the paper surface is to achieve uniform spreading of the molten PE on the paper surface, which requires that the paper surface have as high a surface energy as possible. However, due to the functional requirements of food packaging paper, a relatively large amount of functional chemicals is usually required in the processing process, which usually includes some substances with low surface energy, resulting in a lower surface energy of the paper-forming surface (especially the side without coating layer), and thus a low adhesion strength of the paper surface to PE.
Disclosure of Invention
In view of the above, the present invention provides a wrapping paper and a method for preparing the same, wherein the wrapping paper provided by the present invention has high adhesion strength with PE.
The invention provides a packaging paper, wherein a sizing material layer is arranged on the surface of one side or two sides of the packaging paper;
the glue layer is formed by coating and drying glue solution, and the glue solution comprises the following components in percentage by mass:
the metal salt is a normal salt and comprises one or more of hydrochloride, sulfate and nitrate;
the organic adhesive comprises one or more of starch, carboxymethyl cellulose, methyl cellulose and polyvinyl alcohol.
Preferably, the metal salt is completely dissolved or uniformly dispersed in the glue solution.
Preferably, the hydrochloride comprises one or more of sodium chloride, potassium chloride, calcium chloride, magnesium chloride and aluminum chloride; the sulfate comprises one or more of sodium sulfate, potassium sulfate, calcium sulfate, magnesium sulfate and aluminum sulfate; the nitrate salt includes one or more of sodium nitrate, potassium nitrate and calcium nitrate.
Preferably, the loading capacity of the metal salt on the single surface of the packaging paper is 0.1-4.5 g/m2。
Preferably, the sizing agent is a modified alkyl ketene dimer or an alkyl ketene dimer.
The invention provides a preparation method of the packaging paper in the technical scheme, which comprises the following steps:
and coating glue solution on the surface of one side or two sides of the base paper, and drying to form a glue material layer by the coated glue solution to obtain the packaging paper.
Preferably, the coating mode is rod coating or blade coating.
Preferably, the glue solution is prepared according to the following steps:
the metal salt, the organic adhesive, the sizing agent and the water are directly stirred and mixed to obtain the glue solution.
Preferably, the glue solution is prepared according to the following steps:
a) stirring and mixing metal salt and part of water to obtain a salt solution; stirring and mixing the organic adhesive, the sizing agent and the balance of water to obtain adhesive liquid;
b) and mixing the salt solution and the adhesive liquid to obtain the adhesive liquid.
The invention provides composite packaging paper, which comprises the packaging paper and a PE film adhered to the surface of a sizing material layer of the packaging paper.
Compared with the prior art, the invention provides the packaging paper and the preparation method thereof. The surface of one side or two sides of the packing paper provided by the invention is provided with a sizing material layer; the glue layer is formed by coating and drying glue solution, and the glue solution comprises the following components in percentage by mass: 3-25% of metal salt; 1-20% of an organic adhesive; 0-10% of a sizing agent; 70-90% of water; the metal salt is a normal salt and comprises one or more of hydrochloride, sulfate and nitrate; the organic adhesive comprises one or more of starch, carboxymethyl cellulose, methyl cellulose and polyvinyl alcohol. According to the invention, the sizing material layer with specific components is arranged on the surface of the packaging paper, so that the sizing material layer can improve the surface energy of the paper while improving the basic functions of the paper such as liquid resistance, mechanical strength and smoothness, and the like, thereby improving the adhesive strength between the surface of the paper and PE. The experimental result shows that under the same PE coating process condition, the peeling strength of the wrapping paper and the PE film provided by the invention is far higher than that of common commercially available wrapping paper.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural view of a wrapper having a glue layer disposed on one side thereof according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a wrapping paper provided with a glue layer on both sides according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a packaging paper, wherein a sizing material layer is arranged on the surface of one side or two sides of the packaging paper;
the glue layer is formed by coating and drying glue solution, and the glue solution comprises the following components in percentage by mass:
the metal salt comprises an alkali metal salt and/or an alkaline earth metal salt;
the organic adhesive comprises one or more of starch, carboxymethyl cellulose, methyl cellulose and polyvinyl alcohol.
The packing paper provided by the invention comprises a raw paper layer and a sizing material layer. The raw paper layer is common paper produced by adopting a conventional process, and the surface of the raw paper layer can be precoated with conventional sizing materials such as starch glue or not; the single-side coating amount of the conventional sizing material is preferably 0.5-2 g/m in absolute dry weight2Specifically, it may be 1g/m2. In one embodiment provided by the invention, the raw paper layer is made of fiber raw materials through disintegration, pulping, pulp preparation, flow conveying, dehydration and drying; in another embodiment of the present invention, after drying, surface sizing is performed and conventional size is applied.
In the packaging paper provided by the invention, the glue layer is formed by coating and drying glue solution, and the glue solution comprises metal salt, organic adhesive, sizing agent and water. The metal salt is a normal salt and comprises one or more of hydrochloride, sulfate and nitrate, the metal salt is preferably completely dissolved or uniformly dispersed in the glue solution, the hydrochloride preferably comprises one or more of sodium chloride, potassium chloride, calcium chloride, magnesium chloride and aluminum chloride, the sulfate preferably comprises one or more of sodium sulfate, potassium sulfate, calcium sulfate, magnesium sulfate and aluminum sulfate, the nitrate preferably comprises one or more of sodium nitrate, potassium nitrate and calcium nitrate, the content of the metal salt in the glue solution is 3-25 wt%, specifically 3 wt%, 4 wt%, 5 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt%, 10 wt%, 11 wt%, 11.3 wt%, 12 wt%, 13 wt%, 14 wt%, 15 wt%, 16 wt%, 17 wt%, 18 wt%, 19 wt%, 20 wt%, 21 wt%, or more, 22 wt%, 23 wt%, 24 wt% or 25 wt%; the organic adhesive comprises one or more of starch, carboxymethyl cellulose, methyl cellulose and polyvinyl alcohol, the starch is preferably cassava enzyme converted starch, and the content of the organic adhesive in the glue solution is 1-20 wt%, specifically 1 wt%, 2 wt%, 3 wt%, 4 wt%, 5 wt%, 6 wt%, 6.2 wt%, 7 wt%, 8 wt%, 9 wt%, 10 wt%, 11 wt%, 12 wt%, 13 wt%, 14 wt%, 15 wt%, 16 wt%, 17 wt%, 18 wt%, 19 wt% or 20 wt%; the sizing agent comprises but is not limited to modified alkyl ketene dimer or alkyl ketene dimer, and the content of the sizing agent in the glue solution is 0-10 wt%, specifically 0, 1 wt%, 1.87 wt%, 2 wt%, 3 wt%, 4 wt%, 5 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt% or 10 wt%; the content of the water in the glue solution is 70-90 wt%, and specifically can be 70 wt%, 71 wt%, 72 wt%, 73 wt%, 74 wt%, 75 wt%, 76 wt%, 77 wt%, 78 wt%, 79 wt%, 80 wt%, 81 wt%, 82 wt%, 83 wt%, 84 wt%, 85 wt%, 86 wt%, 87 wt%, 88 wt%, 89 wt% or 90 wt%.
In the wrapping paper provided by the invention, the sizing agent layer is arranged on one side or two sides of the raw paper layer. The loading capacity of the metal salt on the single surface of the raw paper layer is preferably 0.1-4.5 g/m calculated by the metal salt in the sizing agent layer2Specifically, it may be 0.1g/m2、0.3g/m2、0.5g/m2、0.7g/m2、1g/m2、1.09g/m2、1.1g/m2、1.2g/m2、1.3g/m2、1.4g/m2、1.5g/m2、1.56g/m2、1.58g/m2、1.6g/m2、1.65g/m2、1.7g/m2、1.8g/m2、1.9g/m2、2g/m2、2.5g/m2、3g/m2、3.5g/m2、4g/m2Or 4.5g/m2。
In the wrapping paper provided by the invention, for the raw paper layer pre-coated with the conventional sizing material, the sizing material layer is preferably arranged on one side of the raw paper layer, and can also be called as the reverse side of the raw paper layer; the other side, namely the front side, of the raw paper layer is preferably provided with a top coating, the top coating is formed by drying after being coated by a top coating paint, and the components of the top coating paint are not particularly limited, and preferably comprise calcium carbonate, porcelain clay, glue and water; the coating amount of the top coating paint is preferably 15-30 g/m in absolute dry weight2Specifically, it may be 27g/m2. In the present invention, for a base paper layer which is not pre-coated with a conventional size, the size layer is preferably arranged on both sides of the base paper layer.
The surface of the packaging paper provided by the invention is provided with the glue layer with specific components, and the glue can improve the surface energy of the paper while improving the basic functions of the paper such as liquid resistance, mechanical strength, smoothness and the like, so that the adhesive strength between the surface of the paper and PE is improved. The experimental result shows that under the same PE coating process condition, the peeling strength of the wrapping paper and the PE film provided by the invention is far higher than that of common commercially available wrapping paper.
The invention also provides a preparation method of the packaging paper in the technical scheme, which comprises the following steps:
and coating glue solution on the surface of one side or two sides of the base paper, and drying to form a glue material layer by the coated glue solution to obtain the packaging paper.
In the preparation method provided by the invention, the base paper is the base paper layer introduced above, and is not described again; the composition of the glue solution is introduced above and is not described herein again; the glue solution is preferably prepared according to the following steps:
the metal salt, the organic adhesive, the sizing agent and the water are directly stirred and mixed to obtain the glue solution. Wherein the stirring speed is preferably 400-1000 rpm, and specifically can be 400 rpm, 500 rpm, 600 rpm, 700 rpm, 800 rpm, 900 rpm or 1000 rpm; the mixing time is preferably 10-30 min, and specifically can be 10min, 15min, 20min, 25min or 30 min.
In the preparation method provided by the invention, the glue solution is more preferably prepared according to the following steps:
a) stirring and mixing metal salt and part of water to obtain a salt solution; stirring and mixing the organic adhesive, the sizing agent and the balance of water to obtain adhesive liquid;
b) and mixing the salt solution and the adhesive liquid to obtain the adhesive liquid.
In the glue solution preparation step provided by the invention, when the salt solution is prepared, the concentration of the metal salt in the salt solution is determined according to the solubility of the metal salt, and specifically can be 20-40 wt%, more specifically can be 30 wt%; the stirring speed is preferably 400-1000 rpm, and specifically can be 400 rpm, 500 rpm, 600 rpm, 700 rpm, 800 rpm, 900 rpm or 1000 rpm; the mixing temperature is preferably 40-50 ℃, and particularly can be 45 ℃; the mixing time is preferably 10-30 min, and specifically can be 10min, 15min, 20min, 25min or 30 min.
In the glue solution preparation step provided by the invention, when the glue solution is prepared, the stirring speed is preferably 400-1000 rpm, and specifically can be 400 rpm, 500 rpm, 600 rpm, 700 rpm, 800 rpm, 900 rpm or 1000 rpm; the mixing time is preferably 10-30 min, and specifically can be 10min, 15min, 20min, 25min or 30 min.
In the preparation method provided by the invention, the coating amount of the glue solution is determined according to the surface metal salt loading amount of the packaging paper to be prepared; the glue solution is preferably coated by a bar coater or a scraper; the drying mode is preferably hot air drying and/or infrared drying.
According to the preparation method provided by the invention, the glue solution with specific components is coated on the surface of the packaging paper, and the glue solution can improve the surface energy of the paper while improving the basic functions of the paper such as liquid resistance, mechanical strength and smoothness, so that the bonding strength between the surface of the paper and PE is improved. The experimental result shows that the peel strength of the wrapping paper prepared by the invention and the PE film is far higher than that of common commercial wrapping paper under the same PE coating process condition.
The invention also provides composite packaging paper, which comprises the packaging paper and the PE film adhered to the surface of the rubber layer of the packaging paper.
The composite packaging paper provided by the invention comprises the packaging paper, a PE film adhered to the surface of the rubber layer of the packaging paper, and preferably further comprises an aluminum foil adhered to the surface of the PE film. The paper layer and the PE film layer of the composite packaging paper provided by the invention have high bonding strength, and the problem of PE film separation is not easy to occur.
For the sake of clarity, the following examples are given in detail.
Example 1
The wrapping paper with the structure shown in figure 1 is prepared by the following specific steps:
1) preparing base paper: preparing papermaking pulp, wherein the overall proportioning proportion of various fibers is 46 percent of needle bleaching chemical fibers, 36 percent of broad leaf bleaching chemical fibers, 12 percent of needle bleaching thermo-grinding mechanical fibers and 6 percent of broad leaf bleaching thermo-grinding mechanical fibers in absolute dry mass percentage; the prepared pulp is subjected to internal sizing by the conventional production process, and then is fed to a paper machine for dehydration and drying to form the basis weight of 185g/m2Base paper.
2) Surface sizing: preparing surface sizing glue solution, wherein the surface sizing glue solution comprises 94% of water and 6% of cassava enzyme converted starch in absolute dry mass percentage; coating the glue solution on the front and back surfaces of the base paper by using a metering rod, drying by using a drying cylinder, and coating the glue solution on one surface (in absolute dry weight) of the base paper to be 1g/m2。
3) Front coating: preparing a surface coating glue solution, wherein the formula comprises 50% of calcium carbonate, 5.3% of china clay, 8.2% of styrene-butadiene latex and 36.5% of water in absolute dry mass percentage; coating the surface coating layer paint by a scraper, and coating the surface coating layer paint on the front surface of the base paper after surface sizing, wherein the coating amount (in absolute dry weight) is 27g/m2(ii) a And then drying by hot air and infrared rays to form a surface coating.
4) Back coating: preparing a back coating glue solution by 89 percent of water, 3 percent of carboxymethyl cellulose and,Adding water into 8% sodium sulfate, starting a stirrer, stirring at 600 rpm by the disperser, adding carboxymethyl cellulose and sodium sulfate into the paint disperser, and stirring for 20 minutes to prepare a back coating glue solution, wherein the viscosity of the glue solution at 25 ℃ is 5-20 mPa.S; coating the back coating glue solution on the back of the base paper after surface sizing by a bar, then drying by hot air and infrared to form a back glue layer, wherein the coating amount of sodium sulfate on the back of the paper is 1.09g/m2。
The prepared packaging paper is compared with common food packaging base paper, and the data is shown in tables 1-2:
TABLE 1 comparison of the compositions of the paper of example 1 with those of the commercially available paper
Table 2 comparison of the results of measuring physical properties of the wrapping paper of example 1 and the wrapping paper on the market
As is clear from the data in Table 2, the wrapping paper produced in example 1 has not only the stiffness, water absorption, gloss and roughness of the white cardboard for wrapping ordinary cigarettes, but also the heat-seal peeling strength of PE on the reverse side improved. The effect of improving the adhesive strength between the base paper and PE can be obtained by using the wrapping paper prepared in example 1 alone.
Example 2
The wrapping paper with the structure shown in figure 2 is prepared by the following specific steps:
1) preparing base paper: preparing papermaking pulp, wherein the overall proportioning proportion of various fibers is 40 percent of needle bleaching chemical fibers, 24 percent of broad leaf bleaching chemical fibers and 36 percent of needle bleaching thermomechanical fibers in absolute dry mass percentage; the prepared slurry is subjected to conventional productionThe pulp of the production process is internally sized, and then the pulp is conveyed to a paper machine for dehydration and drying to form the basis weight of 285g/m2Base paper.
2) Surface sizing: preparing glue solution, namely adding 84% of water, 6% of cassava enzyme converted starch and 10% of calcium chloride in absolute dry mass percentage, adding water to a coating disperser, starting a stirrer, stirring at 600 revolutions per minute by the disperser, adding starch and calcium chloride to the coating disperser, and stirring for 20 minutes to prepare the glue solution for surface sizing; coating the glue solution on the front and back surfaces of the base paper, and then drying by hot air to form a front glue layer and a back glue layer, wherein the coating amount of calcium chloride on the front and back surfaces of the paper is 1.56g/m respectively2。
The prepared packaging paper is compared with common food packaging base paper, and the data is shown in tables 3-4:
table 3 comparison of the compositions of the wrappers of example 2 with those of commercial wrappers
Table 4 comparison of the results of measuring physical properties of the wrapping paper of example 2 and the wrapping paper on the market
Example 3
The wrapping paper with the structure shown in figure 2 is prepared by the following specific steps:
1) preparing base paper: preparing papermaking pulp, wherein the overall proportioning proportion of various fibers is 40 percent of needle bleaching chemical fibers, 24 percent of broad leaf bleaching chemical fibers and 36 percent of needle bleaching thermomechanical fibers in percentage by mass; the prepared pulp is subjected to internal sizing by the conventional production process, and then is delivered to a paper machine for dehydration and drying to form the basis weight of 250g/m2Base paper.
2) Surface sizing: preparing glue solution, namely, according to the mass percentage, adding water to a coating disperser, starting a stirrer, stirring at the speed of 600 rpm by the disperser, adding starch to the coating disperser, stirring for 20 minutes, and finally putting into a storage tank to prepare glue solution 1, wherein the water accounts for 87%, the cassava enzyme converted starch (calculated by absolute dry weight) and the modified alkyl ketene dimer emulsion are 3%; according to the mass percentage, according to 70 percent of water and 30 percent of calcium chloride, firstly adding water to a coating disperser, starting a stirrer, stirring at the speed of 600 r/min by the disperser, then adding the calcium chloride to the coating disperser, stirring for 20min, and finally putting into a storage tank to prepare a glue solution 2; and (3) mixing the glue solution 1 and the glue solution 2 according to the ratio of 2: 1 volume flow proportion is added into a surface sizing charging tank at the same time, and a surface sizing glue solution with the mass fraction of about 1.87 percent of modified alkyl ketene dimer emulsion, 6.2 percent of starch and 11.3 percent of calcium chloride is prepared according to the specific gravity of the calcium chloride solution of 1.29; coating the glue solution on the front and back surfaces of the base paper, and then drying by hot air to form a front glue layer and a back glue layer, wherein the coating amount of calcium chloride on the front and back surfaces of the paper is about 1.58g/m2。
The prepared packaging paper is compared with common food packaging base paper, and the data are shown in tables 5-6:
TABLE 5 comparison of the compositions of the paper of example 3 with those of the commercially available paper
Table 6 comparison of the results of measuring physical properties of the wrapping paper of example 3 and the commercially available wrapping paper
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The packaging paper is characterized in that a sizing material layer is arranged on one side or two sides of the packaging paper;
the glue layer is formed by coating and drying glue solution, and the glue solution comprises the following components in percentage by mass:
the metal salt is a normal salt and comprises one or more of hydrochloride, sulfate and nitrate;
the organic adhesive comprises one or more of starch, carboxymethyl cellulose, methyl cellulose and polyvinyl alcohol.
2. Wrapping paper according to claim 1, wherein the metal salt is completely dissolved or uniformly dispersed in the glue solution.
3. Wrapping paper as claimed in claim 2, wherein the hydrochloride salt comprises one or more of sodium chloride, potassium chloride, calcium chloride, magnesium chloride and aluminium chloride; the sulfate comprises one or more of sodium sulfate, potassium sulfate, calcium sulfate, magnesium sulfate and aluminum sulfate; the nitrate salt includes one or more of sodium nitrate, potassium nitrate and calcium nitrate.
4. The packaging paper of claim 1, wherein the loading amount of the metal salt on one side of the packaging paper is 0.1-4.5 g/m2。
5. A wrapper according to claim 1, wherein said sizing agent is a modified alkyl ketene dimer or an alkyl ketene dimer.
6. A method of producing a wrapping paper as claimed in any one of claims 1 to 5, comprising the steps of:
and coating glue solution on the surface of one side or two sides of the base paper, and drying to form a glue material layer by the coated glue solution to obtain the packaging paper.
7. The method according to claim 6, wherein the coating is performed by bar coating or blade coating.
8. The preparation method according to claim 6, wherein the glue solution is prepared according to the following steps:
the metal salt, the organic adhesive, the sizing agent and the water are directly stirred and mixed to obtain the glue solution.
9. The preparation method according to claim 6, wherein the glue solution is prepared according to the following steps:
a) stirring and mixing metal salt and part of water to obtain a salt solution; stirring and mixing the organic adhesive, the sizing agent and the balance of water to obtain adhesive liquid;
b) and mixing the salt solution and the adhesive liquid to obtain the adhesive liquid.
10. A composite wrapper, comprising the wrapper according to any one of claims 1 to 5 and a PE film adhered to the surface of the gum layer of the wrapper.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114541177A (en) * | 2022-02-15 | 2022-05-27 | 亚太森博(广东)纸业有限公司 | Moisture-proof paper and manufacturing method thereof |
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| CN104827794A (en) * | 2008-12-16 | 2015-08-12 | 惠普开发有限公司 | Liquid toner digital printing medium |
| CN104822880A (en) * | 2012-11-09 | 2015-08-05 | 盟迪股份公司 | Online treated sealable and peelable medical paper for medical sterilization packaging |
| CN107663813A (en) * | 2016-07-29 | 2018-02-06 | 华南理工大学 | A kind of damp-prrof packing paper and compound glue application solution and their preparation method |
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Application publication date: 20210101 |