CN113373733A - Production method of special water-resistant craft paper for freezing box - Google Patents
Production method of special water-resistant craft paper for freezing box Download PDFInfo
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- CN113373733A CN113373733A CN202110647525.4A CN202110647525A CN113373733A CN 113373733 A CN113373733 A CN 113373733A CN 202110647525 A CN202110647525 A CN 202110647525A CN 113373733 A CN113373733 A CN 113373733A
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- sizing
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- surface sizing
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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
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/17—Ketenes, e.g. ketene dimers
-
- 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
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
-
- 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
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/24—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
-
- 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
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
- D21H23/56—Rolls
- D21H23/58—Details thereof, e.g. surface characteristics, peripheral speed
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paper (AREA)
Abstract
The invention provides a production method of special water-resistant craft paper for a freezing box, the novel water-resistant moisture-proof process of the craft paper researched by the project overcomes the problem that the integral moisture-proof performance of the paper is poor due to local punctiform water penetration when the traditional gluing process is used, and has the dual advantages of low cost and high efficiency, thereby having great popularization value and wide application prospect; the invention increases the absorption of paper to sizing material by improving the sizing machine equipment and the operation parameters; the novel sizing and moistureproof medicine is developed by cooperating with a chemical manufacturer, the sizing process is improved, and the problem of poor overall moistureproof performance of paper caused by local punctiform water permeability when the traditional sizing process is used is solved; the sizing roller is made of a PU material with lower hardness, so that the absorption of paper pages to sizing materials is increased. Optimizing the indexes of sizing temperature, viscosity, solid content and the like.
Description
Technical Field
The invention relates to the technical field of pulping and papermaking, in particular to a production method of a special water-resistant kraft paper for a freezer.
Background
The carton is an important transport packaging container, is made of corrugated boards made of kraft liner boards and corrugated base paper through die cutting, impressing, carton nailing or carton bonding, has the characteristics of lightness, firmness, good commodity protection, recyclability and convenience in loading, unloading and transportation, is widely applied to the transport and sale packaging of various commodities such as household appliances, textiles, food and the like, and plays an extremely important role in modern commodity packaging;
1. along with the development of logistics and the expansion of the field of cold chain circulation of food, a paper box is also widely applied to cold chain circulation as a main transport packaging container, a high-strength moisture-proof paper box becomes one of important factors for restricting the cold chain circulation, the packaging of frozen commodities is to keep the low temperature of the environment in the box and prevent products from thawing, the paper box is generally subjected to heat preservation treatment, once the paper box is exposed to the normal temperature after being out of a refrigeration house, water drops are condensed inside and outside the paper box due to the temperature difference, if the paper box is not subjected to waterproof treatment, the strength of the paper box is damaged due to the permeation of water, the protective performance of the paper box is lost, the strength is reduced to cause the phenomenon of collapsing, the traditional surface sizing agent is of a microcapsule structure, a layer of a water-resistant film is formed on the surface of paper by the sizing agent under the help of starch in the process of gluing and drying of a paper machine, the ash content and the air permeability of domestic waste paper are higher, and the moisture resistance of the paper is relatively weaker, moreover, under the influence of the current domestic environmental protection pressure and foreign trade environment, the import of foreign waste is greatly limited, the domestic waste has the characteristics of more fiber recycling times, short fiber, high sand content and the like relative to the foreign waste, the ash content, the air permeability and the like of the kraft liner paper after the foreign waste is replaced by the domestic waste in a large amount are changed, and the kraft liner paper is easy to absorb moisture and soften in the subsequent use process of customers, so that the development of the high-strength moisture-proof freezing carton has important practical significance.
Disclosure of Invention
According to the technical problem, the invention provides a production method of special water-resistant craft paper for a refrigerator, which comprises the following process steps:
1. surface sizing process
The strengthening mechanism of the paper sheet in the surface sizing process mainly comes from the bonding effect of starch glue, the bonding of the starch glue promotes the combination of fibers, and from the angle of improving the strength of the paper sheet, the increase of the penetration of glue solution is more beneficial to the increase and maintenance of the strength of the paper sheet after sizing; because the original starch has high viscosity and poor fluidity, is easy to generate flocculation phenomenon and is not suitable for surface sizing, the starch needs to be modified, so that the starch has lower viscosity at higher concentration, the medium-temperature a-amylase is used for completing the continuous conversion of the starch, the manufacturing cost is low, the starch glue with higher concentration can be prepared, the starch conversion concentration is 20-25%, the dosage of an enzyme preparation is generally 0.01-0.06 thousandth, the reaction reaches the required viscosity, the reaction is stopped by using high-temperature inactivation, and the use effect of the starch glue is prevented from being influenced by further hydrolysis;
in order to enable the surface sizing to play the maximum effect in the production of the special kraft liner paper for the freezing box, adapt to the normal operation of a sizing machine and reduce the paper breakage at the sizing machine, the viscosity of the glue solution needs to be kept in a proper range, generally controlled at 10-40 mPa.s (65 ℃), and the concentration of the starch glue solution is generally controlled at 8% -12%; by using the film transfer type sizing machine, higher concentration can be used, so that the moisture of the sized paper can be reduced, the steam consumption of a rear drying part is reduced, and the enhancement effect is also favorable;
aiming at different purposes of surface sizing, different control measures are needed, mainly for improving the surface performance, the penetration of glue solution into the paper is reduced, the film forming condition is improved, including measures of properly improving the moisture of the base paper, improving the viscosity of the glue solution and the like, and mainly for improving the bonding strength, the penetration of the glue solution into the paper is increased, including measures of properly reducing the moisture of the base paper, improving the concentration of the glue solution and the like.
2. Chemical auxiliary materials required for surface sizing
The liquid-repellent performance of the packaging paper and the paperboard is evaluated by a Cobb surface water absorption gravimetric method, and can also be tested by a liquid penetration method; because the molecular structure of the starch is similar to that of cellulose and does not have water-resistant and moisture-proof performance, the strength of the paper sheet after moisture absorption is almost equal to that of the paper sheet without sizing, and the surface sizing is not enough by only using starch glue. In the production, a proper surface sizing agent is matched and used to improve the lyophobic performance of the paper sheet, and the water resistance of the sized paper sheet can be obviously improved by matching the surface sizing agent in the glue solution;
the selection and characteristics of the surface sizing agent are divided according to the curing time, and the commonly used surface sizing agent has two types of fast curing and slow curing. The quick-curing type surface sizing agent mainly comprises styrene acrylate, and is characterized by high solid content, stable quality and long shelf life, and the water-resistant effect can be completely obtained after curing in the drying process and discharging. The slow-curing type mainly comprises AKD surface sizing agent, and is characterized by slightly low solid content, short shelf life, partial curing in the drying process, hysteresis of water-resistant effect, great influence by weather temperature and humidity, and non-strict use conditions. The novel surface sizing AKD improves the curing speed, and when the novel surface sizing AKD is applied to the production of the special kraft liner for the freezing box, the sizing effect can be achieved after the paperboard is taken off the machine for one hour;
the styrene acrylate surface sizing agent and the AKD surface sizing agent are matched for use, so that a good water-resistant and moisture-proof effect is achieved.
3. Internal sizing
AKD belongs to a reactive sizing agent, can directly react with active hydroxyl on cellulose fiber under neutral or alkaline conditions to generate firm covalent bond type beta-ketoester, does not generate the reversion phenomenon of the sizing degree, has few scaling problems, can obtain the heavy sizing effect without sediment and false sizing phenomena, but has longer curing time.
4. Optimization of rubber coating material of applicator roll
The novel PU sizing roller is used, the hardness of a glue layer is reduced to 20P & J, the width and the residence time of a press nip of sizing press are increased, the picking amount of paper pages to the glue is increased, and the wear resistance and the service life of a sizing metering rod of the sizing machine are obviously improved.
The invention has the beneficial effects that: the novel water-resistant moisture-proof craft of the craft paper researched by the project overcomes the problem of poor integral moisture-proof performance of the paper caused by local point-like water permeation when the traditional gluing craft is used, has the dual advantages of low cost and high efficiency, and has great popularization value and wide application prospect;
the invention increases the absorption of paper to sizing material by improving the sizing machine equipment and the operation parameters; the novel sizing and moistureproof medicine is developed by cooperating with a chemical manufacturer, the sizing process is improved, and the problem of poor overall moistureproof performance of paper caused by local punctiform water permeability when the traditional sizing process is used is solved;
the sizing roller is made of a PU material with lower hardness, so that the absorption of paper pages to sizing materials is increased. Optimizing the indexes of sizing such as temperature, viscosity, solid content and the like;
the traditional in-pulp AKD sizing process is applied to surface sizing by cooperating with a chemical manufacturer, the sizing process is improved by utilizing the good reactivity of AKD and fiber, and the problem of poor integral moisture resistance of paper caused by local punctate water permeability when the traditional sizing process is used is solved;
the novel surface sizing agent used in the invention applies the traditional in-pulp AKD sizing process to surface sizing, the liquid medicine permeates into the interior of paper sheets to react with the hydroxyl groups of cellulose, the water-resistant and moisture-proof effects of the finished paper are enhanced, and simultaneously, the novel PU sizing roller is used in a matching way, the picking amount of the sizing material is further increased, so that the water-resistant performance of the special kraft liner paper for the freezing box is superior to that of products in the same industry.
Detailed Description
1. Surface sizing process
The strengthening mechanism of the paper sheet in the surface sizing process mainly comes from the bonding effect of starch glue, the bonding of the starch glue promotes the combination of fibers, and from the angle of improving the strength of the paper sheet, the increase of the penetration of glue solution is more beneficial to the increase and maintenance of the strength of the paper sheet after sizing; because the original starch has high viscosity and poor fluidity, is easy to generate flocculation phenomenon and is not suitable for surface sizing, the starch needs to be modified, so that the starch has lower viscosity at higher concentration, the medium-temperature a-amylase is used for completing the continuous conversion of the starch, the manufacturing cost is low, the starch glue with higher concentration can be prepared, the starch conversion concentration is 20-25%, the dosage of an enzyme preparation is generally 0.01-0.06 thousandth, the reaction reaches the required viscosity, the reaction is stopped by using high-temperature inactivation, and the use effect of the starch glue is prevented from being influenced by further hydrolysis;
in order to enable the surface sizing to play the maximum effect in the production of the special kraft liner paper for the freezing box, adapt to the normal operation of a sizing machine and reduce the paper breakage at the sizing machine, the viscosity of the glue solution needs to be kept in a proper range, generally controlled at 10-40 mPa.s (65 ℃), and the concentration of the starch glue solution is generally controlled at 8% -12%; by using the film transfer type sizing machine, higher concentration can be used, so that the moisture of the sized paper can be reduced, the steam consumption of a rear drying part is reduced, and the enhancement effect is also favorable;
aiming at different purposes of surface sizing, different control measures are needed, mainly for improving the surface performance, the penetration of glue solution into the paper is reduced, the film forming condition is improved, including measures of properly improving the moisture of the base paper, improving the viscosity of the glue solution and the like, and mainly for improving the bonding strength, the penetration of the glue solution into the paper is increased, including measures of properly reducing the moisture of the base paper, improving the concentration of the glue solution and the like.
2. Chemical auxiliary materials required for surface sizing
The liquid-repellent performance of the packaging paper and the paperboard is evaluated by a Cobb surface water absorption gravimetric method, and can also be tested by a liquid penetration method; because the molecular structure of the starch is similar to that of cellulose and does not have water-resistant and moisture-proof performance, the strength of the paper sheet after moisture absorption is almost equal to that of the paper sheet without sizing, and the surface sizing is not enough by only using starch glue. In the production, a proper surface sizing agent is matched and used to improve the lyophobic performance of the paper sheet, and the water resistance of the sized paper sheet can be obviously improved by matching the surface sizing agent in the glue solution;
the selection and characteristics of the surface sizing agent are divided according to the curing time, and the commonly used surface sizing agent has two types of fast curing and slow curing. The quick-curing type surface sizing agent mainly comprises styrene acrylate, and is characterized by high solid content, stable quality and long shelf life, and the water-resistant effect can be completely obtained after curing in the drying process and discharging. The slow-curing type mainly comprises AKD surface sizing agent, and is characterized by slightly low solid content, short shelf life, partial curing in the drying process, hysteresis of water-resistant effect, great influence by weather temperature and humidity, and non-strict use conditions. The novel surface sizing AKD improves the curing speed, and when the novel surface sizing AKD is applied to the production of the special kraft liner for the freezing box, the sizing effect can be achieved after the paperboard is taken off the machine for one hour;
the styrene acrylate surface sizing agent and the AKD surface sizing agent are matched for use, so that a good water-resistant and moisture-proof effect is achieved.
3. Internal sizing
AKD belongs to a reactive sizing agent, can directly react with active hydroxyl on cellulose fiber under neutral or alkaline conditions to generate firm covalent bond type beta-ketoester, does not generate the reversion phenomenon of the sizing degree, has few scaling problems, can obtain the heavy sizing effect without sediment and false sizing phenomena, but has longer curing time.
4. Optimization of rubber coating material of applicator roll
The novel PU sizing roller is used, the hardness of a glue layer is reduced to 20P & J, the width and the residence time of a press nip of sizing press are increased, the picking amount of paper pages to the glue is increased, and the wear resistance and the service life of a sizing metering rod of the sizing machine are obviously improved.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. While the invention has been described with respect to the above embodiments, it will be understood by those skilled in the art that the invention is not limited to the above embodiments, which are described in the specification and illustrated only to illustrate the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. A production method of special water-resistant craft paper for a refrigerator comprises the following process steps:
1. surface sizing process
The strengthening mechanism of the paper sheet in the surface sizing process mainly comes from the bonding effect of starch glue, the bonding of the starch glue promotes the combination of fibers, and from the angle of improving the strength of the paper sheet, the increase of the penetration of glue solution is more beneficial to the increase and maintenance of the strength of the paper sheet after sizing; the starch needs to be modified to ensure that the starch has lower viscosity at higher concentration, continuous conversion of the starch is completed by using medium-temperature a-amylase, the manufacturing cost is low, the starch glue with higher concentration can be prepared, the starch conversion concentration is 20-25%, the dosage of an enzyme preparation is generally 0.01-0.06 thousandth, the reaction reaches the required viscosity, the reaction is stopped by using high-temperature inactivation, and the influence of further hydrolysis on the use effect of the starch glue is prevented.
2. Chemical auxiliary materials required for surface sizing
The liquid-repellent performance of the packaging paper and the paperboard is evaluated by a Cobb surface water absorption gravimetric method, and can also be tested by a liquid penetration method; because the molecular structure of the starch is similar to that of cellulose and does not have water-resistant and moisture-proof performance, the strength of the paper sheet after moisture absorption is almost equal to that of the paper sheet without sizing, and the surface sizing is not enough by only using starch glue. In the production, proper surface sizing agent is needed to be matched and used for improving the lyophobic performance of the paper sheet, and the water resistance of the sized paper sheet can be obviously improved by matching the surface sizing agent in the glue solution.
3. Internal sizing
AKD belongs to a reactive sizing agent, can directly react with active hydroxyl on cellulose fiber under neutral or alkaline conditions to generate firm covalent bond type beta-ketoester, does not generate the reversion phenomenon of the sizing degree, has few scaling problems, can obtain the heavy sizing effect without sediment and false sizing phenomena, but has longer curing time.
4. Optimization of rubber coating material of applicator roll
The novel PU sizing roller is used, the hardness of a glue layer is reduced to 20P & J, the width and the residence time of a press nip of sizing press are increased, the picking amount of paper pages to the glue is increased, and the wear resistance and the service life of a sizing metering rod of the sizing machine are obviously improved.
2. The method for producing the special water-resistant kraft liner board for the refrigerator according to claim 1, wherein in order to enable the surface sizing to exert the maximum effect in the production of the special kraft liner board for the refrigerator, adapt to the normal operation of a sizing machine and reduce the occurrence of paper breakage at the sizing machine, the viscosity of the glue solution needs to be kept in a proper range, generally controlled at 10-40 mPa · s (65 ℃), and the concentration of the starch glue solution is generally controlled at 8% -12%; by using the film transfer type sizing machine, higher concentration can be used, so that the moisture of the sized paper can be reduced, the steam consumption of a rear drying part is reduced, and the enhancement effect is also favorable;
aiming at different purposes of surface sizing, different control measures are needed, mainly for improving the surface performance, the penetration of glue solution into the paper is reduced, the film forming condition is improved, including measures of properly improving the moisture of the base paper, improving the viscosity of the glue solution and the like, and mainly for improving the bonding strength, the penetration of the glue solution into the paper is increased, including measures of properly reducing the moisture of the base paper, improving the concentration of the glue solution and the like.
3. The method for producing the special water-resistant kraft paper for the freezing box according to claim 1, wherein the surface sizing agent is selected and characterized in that the surface sizing agent is cured in time, and the surface sizing agent is quick-curing and slow-curing. The quick-curing type surface sizing agent mainly comprises styrene acrylate, and is characterized by high solid content, stable quality and long shelf life, and the water-resistant effect can be completely obtained after curing in the drying process and discharging. The slow-curing type mainly comprises AKD surface sizing agent, and is characterized by slightly low solid content, short shelf life, partial curing in the drying process, hysteresis of water-resistant effect, great influence by weather temperature and humidity, and non-strict use conditions. The novel surface sizing AKD improves the curing speed, and when the novel surface sizing AKD is applied to the production of the special kraft liner for the freezing box, the sizing effect can be achieved after the paperboard is taken off the machine for one hour;
the styrene acrylate surface sizing agent and the AKD surface sizing agent are matched for use, so that a good water-resistant and moisture-proof effect is achieved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110647525.4A CN113373733A (en) | 2021-06-08 | 2021-06-08 | Production method of special water-resistant craft paper for freezing box |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110647525.4A CN113373733A (en) | 2021-06-08 | 2021-06-08 | Production method of special water-resistant craft paper for freezing box |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114592374A (en) * | 2022-03-29 | 2022-06-07 | 江苏博汇纸业有限公司 | Method for improving water absorption of paperboard fiber layer |
| CN115613393A (en) * | 2022-09-22 | 2023-01-17 | 珠海红塔仁恒包装股份有限公司 | Paper with high internal bonding strength and preparation method and application thereof |
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| CN111560790A (en) * | 2020-06-03 | 2020-08-21 | 玖龙纸业（东莞）有限公司 | Water-resistant and moisture-proof method for corrugated base paper |
| CN112012045A (en) * | 2020-09-03 | 2020-12-01 | 联盛纸业（龙海）有限公司 | Craft paper and preparation method thereof |
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2021
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| US6368443B1 (en) * | 1993-01-28 | 2002-04-09 | Corn Products International, Inc. | Starch-hemicellulose adhesive for high speed corrugating |
| CN111560790A (en) * | 2020-06-03 | 2020-08-21 | 玖龙纸业（东莞）有限公司 | Water-resistant and moisture-proof method for corrugated base paper |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114481659B (en) * | 2022-01-05 | 2024-03-15 | 山东太阳宏河纸业有限公司 | High-strength craft paper and production process thereof |
| CN114592374A (en) * | 2022-03-29 | 2022-06-07 | 江苏博汇纸业有限公司 | Method for improving water absorption of paperboard fiber layer |
| CN115613393A (en) * | 2022-09-22 | 2023-01-17 | 珠海红塔仁恒包装股份有限公司 | Paper with high internal bonding strength and preparation method and application thereof |
| CN115613393B (en) * | 2022-09-22 | 2023-12-05 | 珠海红塔仁恒包装股份有限公司 | Paper with high internal bonding strength and preparation method and application thereof |
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