CN110344278B - Damp-proof process for corrugated base paper - Google Patents
Damp-proof process for corrugated base paper Download PDFInfo
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- CN110344278B CN110344278B CN201910673195.9A CN201910673195A CN110344278B CN 110344278 B CN110344278 B CN 110344278B CN 201910673195 A CN201910673195 A CN 201910673195A CN 110344278 B CN110344278 B CN 110344278B
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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
- D21F11/12—Making corrugated paper or board
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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
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/28—Starch
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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
- D21H17/63—Inorganic compounds
- D21H17/66—Salts, e.g. alums
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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
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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
- D21H21/16—Sizing or water-repelling agents
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- Inorganic Chemistry (AREA)
- Paper (AREA)
Abstract
The invention discloses a damp-proof process for corrugated base paper, which relates to a papermaking technology and is used for solving the problem of high moisture regain of paper produced by a common process, and the process comprises the following steps: preparing a gum base, dissolving starch and ferric ion salt in water, and heating and pasting to obtain the gum base; diluting the gum base, namely diluting the gum base for later use; mixing to form gel, adding water-resisting agent into the diluted gum base to obtain gel; sizing paper pulp, spraying the sized paper pulp on wet paper, and drying to obtain corrugated base paper; the invention has the following advantages and effects: the corrugated base paper manufactured by the process contains water-resistant agent components, so that the corrugated base paper has better water resistance and moisture resistance compared with common corrugated paper, and is difficult to absorb water vapor in the air to soften in plum rain seasons, so that the corrugated case is difficult to collapse, and the purpose of reducing the quality accident rate is achieved.
Description
Technical Field
The invention relates to a papermaking technology, in particular to a damp-proof process for corrugated base paper.
Background
Since the invention of paper technology, paper has revolutionized the progress of human civilization, and with the progress of science and technology, paper has become more and more versatile. For printing, the smoothness and printability of paper are generally required to be good, and for packaging, the strength and water resistance of paper may be highly required.
According to the conventional process, the paper making process is roughly as follows: cutting trees and grass plants into pieces, boiling, and grinding the boiled plant fibers to fully disperse the fibers; then, the paper pulp is screened, decontaminated, bleached and cleaned, and then is pulped, namely, the fiber is pulped by a screen, at the moment, a thin layer of wet paper is obtained on the screen, and finally, the wet paper is squeezed and drained to obtain the paper.
In industrial applications, it has been found that corrugated paper having good ring crush strength can be obtained after folding and composite gluing of a plurality of layers of base paper, and therefore cartons made of corrugated paper are often used for carrying goods. In the case of corrugated cardboard boxes, since they are often subjected to stacking of goods during application, if the strength of the corrugated cardboard boxes is not sufficient, collapse occurs, and the goods in the corrugated cardboard boxes are damaged.
Several factors which have great influence on the strength of the corrugated case mainly include the thickness of the corrugated paper, the water content of the corrugated paper, the number of layers of the corrugated paper and the like, and for the influence factor of the water content, continuous rainfall occurs in all parts of the country in a period of time along with the change of seasons every year, and the period of time is also called as plum rain seasons. In the south, rainfall is particularly severe in the rainy season, where the relative humidity in the entire air may reach over 80%. Paper usually has certain hydroscopicity, and corrugated case is also the same, and the process that the carton absorbs steam from the air is called and gets damp, and the paper after getting damp can produce and soften the phenomenon, causes the serious decline of carton ring crush strength, just so leads to piled up goods to take place to collapse easily, and then causes the quality accident.
Disclosure of Invention
The invention aims to provide a corrugated medium damp-proof process, which can reduce the moisture regain of paper and reduce the influence of plum rain season on the strength of a paper box, thereby achieving the purpose of reducing the occurrence rate of quality accidents.
The technical purpose of the invention is realized by the following technical scheme: a damp-proof process for corrugated base paper comprises the following steps:
s1 preparing gum base, dissolving starch and ferric ion salt in water, mixing, and mixing
Heating and stirring until starch is gelatinized to prepare a gum base;
s2 diluting the gum base, conveying the gum base prepared in the step S1 to a dilution barrel, and adding water into the dilution barrel
Diluting, and pumping the diluted gum base to a feeding barrel for later use;
s3 preparing into gel, adding water repellent into the diluted gum base in step S2,
mixing uniformly to obtain a gel;
and S4, sizing the paper pulp, mixing the glue obtained in the step S3 into the paper pulp, and squeezing and draining to obtain the moisture-resistant corrugated base paper.
By adopting the scheme, the starch has viscosity after being gelatinized, and the fibers in the paper pulp can be bonded with each other, so that the paper can be formed; the water-resisting agent is used for improving the moisture resistance of the paper; meanwhile, the iron ion salt is added into the starch, the cohesion of the starch paste can be reduced mainly because the iron ion, namely the rheological property of the starch paste is improved, so that the permeability of the starch in sizing the paper pulp can be improved, a water repellent agent in the starch paste can uniformly permeate into the paper along with the flow of the starch glue, and the paper can have better moisture resistance, so that the paper is not easy to absorb water vapor in the air to soften in plum rain seasons, and the purpose of reducing the occurrence rate of quality accidents is achieved.
The invention is further provided with: in step S1, the specific preparation method of the gum base includes: mixing starch and warm water in a ratio of 1:1, adding 10-15% of ferric ion salt in weight of starch into a starch turbid liquid, fully mixing and stirring to form a suspension solution, slowly heating the starch solution to 90-95 ℃, preserving heat for 15-20 min, and continuously keeping stirring the starch solution in the heating process.
By adopting the scheme, the solubility of the starch in water can be increased by raising the temperature under normal conditions, but the gelatinization phenomenon can be generated by heating the starch too high, so that the water temperature cannot be too high during dissolving, and the use of warm water is more suitable; besides the cohesiveness of the starch can be reduced, the iron ions can be coordinated with lone pair electrons of polysaccharide hydroxyl groups in the starch paste to form a network structure, the network structure is also provided with certain water resistance after being attached to the surface of paper, and meanwhile, for most plant starches, the gelatinization temperature of the plant starches is near 95 ℃, so that the complete gelatinization of most kinds of starches can be guaranteed within the temperature range of 90-95 ℃, the stirring is performed to ensure that all parts of the starches are uniformly heated, the phenomenon that the local parts are excessively heated to cause scorching is avoided, the heat preservation can further provide the gelatinization time for the starch, and the service performance of the starch paste gum base is improved.
The invention is further provided with: before adding the iron ion salt, glacial acetic acid is added to the starch solution to adjust the pH value of the starch solution to 6-7.
By adopting the scheme, once the iron ions are contacted with the alkaline substances, the complex reaction can be carried out to generate precipitation, so that the environment where the iron ions are located is required to be ensured to be acidic before the iron ion metal salt is added, otherwise, the content of the iron ions in the starch paste is reduced, and therefore, the acidic substances are required to be added to adjust the pH value, the glacial acetic acid is low in cost and easy to obtain, and therefore, the glacial acetic acid is a better choice as an additive for adjusting the pH value.
The invention is further provided with: the specific heating method of the starch solution comprises the following steps: taking steam as a heat source, firstly heating the starch solution to 65 ℃ at the heating rate of 5 ℃/min, then heating the starch solution to 90 ℃ at the heating rate of 3 ℃/min, then heating the starch solution to 95 ℃ at the heating rate of 2 ℃/min, and preserving heat for 15min to fully gelatinize the starch.
By adopting the scheme, through practical experiments, the starch granules begin to expand at about 70 ℃, obviously expand at about 80 ℃, completely disappear at about 95 ℃, and completely gelatinize the starch granules when the starch granules completely disappear, the heating of the starch is carried out in different areas, the temperature before the starch begins to gelatinize is mainly considered to be reached as soon as possible, unnecessary time loss is reduced, the temperature rise rate is not too fast after the starch begins to gelatinize, otherwise the starch has the risk of nonuniform gelatinization, and the temperature is as slow as possible when the temperature is close to the temperature for completely gelatinizing the starch, so that the time for fully absorbing heat by the starch can be given, and the starch is promoted to be better gelatinized.
The invention is further provided with: the concentration of the diluted gum base in the step S2 is 6-8%.
Starch gelatinization back is very viscous, and the concentration is higher, the viscosity is bigger, starch glue is applyed the back on wet paper like this, the permeability is just relatively poor, and also be difficult to glue with the mode of spraying, through adopting above-mentioned scheme, after diluting starch glue base, can reduce the size of hanging after glue base is applyed on wet paper, so that the size of hanging too much causes paper pulp thickness grow, the produced dust volume of starch glue base fragmentation is just less when paper folding like this, simultaneously, can improve the mobility of glue base after diluting, can improve starch glue's permeability to paper like this, thereby make the water-resistant performance of each part of paper more even.
The invention is further provided with: in the step S3, the water repellent agent contains polyvinyl alcohol and phenolic resin, and the specific preparation method is as follows: firstly, heating polyvinyl alcohol to 70-80 ℃, then slowly adding phenolic resin into the polyvinyl alcohol, slowly and continuously stirring the solution in the adding process, and continuously stirring for 10-20 min under heat preservation after the phenolic resin is added.
By adopting the scheme, the polyvinyl alcohol is an organic compound dissolved in water, can be hydroformylated after being combined with the phenolic resin, and has oleophobic and hydrophobic properties, so that the water resistance and moisture resistance of the paper can be greatly improved after the polyvinyl alcohol is attached to the paper; the reason why the polyvinyl alcohol and the phenol resin are prepared first is that the solubility of the phenol resin in water is low, and if either of them is dispersed in the gum base first, the hydroformylation may be insufficient at the time of the reaction, which may affect the performance of the water repellent.
The invention is further provided with: the addition amount of the polyvinyl alcohol is 0.8-1.2% of the total weight of the diluted gum base.
The invention is further provided with: the addition amount of the phenolic resin is 0.7-1.0% of the total weight of the diluted gum base.
By adopting the scheme, substances generated after polyvinyl alcohol is hydroformylated are insoluble in water, and if the addition amount of polyvinyl alcohol and phenolic resin is too large, starch gum base is possibly too viscous or lumps are directly formed, so that starch gum can not be used for sizing paper; meanwhile, if the content of the water repellent agent attached to the paper is too high, the water repellency of the paper is too high, so that the ink may not be printed when the paper is used as printing paper, and therefore, the addition amount of the water repellent agent formed by polyvinyl alcohol and phenolic resin needs to be controlled well.
The invention is further provided with: in step S4, the specific sizing method of the pulp is as follows: the glue prepared in the step S3 is uniformly sprayed on wet paper, the wet paper is sprayed twice back and forth, then the wet paper is strongly sucked from one side of the back of the spraying surface for 5-10S, the step is completed as a gluing process, and the wet paper can be squeezed and drained to prepare the corrugated base paper by gluing the paper pulp for three times in total.
Through adopting above-mentioned scheme, spray wet paper earlier, carry out powerful suction from the water of reverse side on to wet paper again, can let starch glue permeate into and go in wet paper with the help of the negative pressure that water made, carry out the cubic glueing repeatedly, be in order to guarantee that starch glue can fully permeate wet paper, just can have better water-resistant and moisture resistance after the paper shaping like this.
In conclusion, the invention has the following beneficial effects:
1. the corrugated base paper manufactured by the process contains water-resistant agent components, so that the corrugated base paper has better water resistance and moisture resistance compared with common corrugated paper, and is difficult to absorb water vapor in the air to soften in plum rain seasons, so that the corrugated case is difficult to collapse, and the aim of reducing the quality accident rate is fulfilled;
2. the heating mode of the sectional heating can quickly pass through the waiting temperature interval of starch gelatinization, reduce unnecessary time waste in the starch gelatinization process, and simultaneously prolong the retention time of the starch in the gelatinization temperature interval, thereby improving the gelatinization degree of the starch;
3. the mode of spraying and gluing and then strongly pumping can promote the penetration force of the starch glue to the wet paper by means of wind pressure, so that the starch glue can fully penetrate into the wet paper, and the corrugated base paper has more uniform water resistance and moisture resistance after being formed.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1:
as shown in fig. 1, a corrugated medium moisture-proof process includes the following steps:
s1, preparing a gum base, mixing starch and warm water in a ratio of 1:1, adding the starch while stirring in the process of dissolving the starch to obtain a starch suspension solution, adding glacial acetic acid into the starch solution to adjust the pH value to 6-7, adding 15% of ferrous sulfate based on the weight of the starch into the starch suspension, and fully mixing and stirring.
After ferrous sulfate is added, the starch solution needs to be gelatinized, and the specific operation method comprises the following steps: taking steam as a heat source, heating the starch solution to 65 ℃ at a heating rate of 5 ℃/min, then heating the starch solution to 90 ℃ at a heating rate of 3 ℃/min, then heating the starch solution to 95 ℃ at a heating rate of 2 ℃/min, and preserving heat for 15min to fully gelatinize the starch to obtain the gum base.
It should be noted that the starch solution needs to be continuously stirred throughout the heating process to prevent the starch from being burnt due to local overheating.
And S2, diluting the gum base, namely conveying the gum base prepared in the step S1 into a dilution barrel, adding water for dilution, wherein the concentration of the diluted gum base is kept at 6-8%, and the too high concentration of the starch gum base can cause the gum base to be too viscous, so that the gum base is not beneficial to sizing paper pulp, and meanwhile, the diluted gum base is pumped into a supply barrel for later use.
S3, preparing glue, adding a water-resistant agent into the diluted glue base in the step S2, wherein the water-resistant agent mainly comprises polyvinyl alcohol and phenolic resin, and the water-resistant agent needs to be pre-prepared before use, and the specific preparation method comprises the following steps: firstly, heating polyvinyl alcohol to 70 ℃, then slowly adding the phenolic resin into the polyvinyl alcohol, slowly and continuously stirring the solution in the adding process, and continuously stirring for 10-20 min under heat preservation after the phenolic resin is added, so that the polyvinyl alcohol and the phenolic resin are fully reacted.
And after the water repellent agent is prepared, adding the water repellent agent into the diluted gum base, stirring at the rotating speed of 800r/min in the adding process, and fully and uniformly mixing to prepare the starch for gelatinizing.
S4, sizing paper pulp, namely, uniformly spraying the prepared starch glue on wet paper, spraying the starch glue twice back and forth, strongly sucking the wet paper on one side of the back of the wet paper, which is opposite to a spraying surface, for 5-10S, completing the steps, namely, one sizing process, and squeezing and draining the wet paper to prepare the corrugated base paper by totally applying the paper pulp for three times.
The starch gelatinizing agent is used for ensuring that starch gelatinizing can fully permeate into paper, and simultaneously, the condition that local spraying is uneven due to single spraying is avoided, so that the water resistance of each part of the paper is closer, and the paper has better moisture resistance.
Comparative example 2:
a corrugated medium damp-proof process is characterized in that a water repellent agent is not added, and other process conditions and steps are completely the same as those in embodiment 1.
Example 3:
a damp-proof process for corrugated base paper only adds polyvinyl alcohol accounting for 1% of the total weight of diluted gum base as a water repellent, and the rest process conditions and steps are completely the same as those in example 1.
Example 4:
a moisture-proof process for corrugated base paper only adds phenolic resin accounting for 0.8% of the total weight of diluted gum base as a water repellent, and the rest process conditions and steps are completely the same as those in example 1.
Example 5:
a moistureproof process for corrugated base paper comprises the steps of reacting polyvinyl alcohol accounting for 0.5% of the total weight of a diluted glue base with phenolic resin accounting for 0.8% of the total weight of the diluted glue base to prepare a water-repellent agent, adding the water-repellent agent into the glue base prepared in the step S2, and fully and uniformly stirring, wherein the rest process conditions and steps are completely the same as those in the embodiment 1.
Example 6:
a moistureproof process for corrugated base paper comprises the steps of reacting polyvinyl alcohol accounting for 0.7% of the total weight of a diluted gum base with phenolic resin accounting for 0.8% of the total weight of the diluted gum base to prepare a water-repellent agent, adding the water-repellent agent into the gum base prepared in the step S2, and fully and uniformly stirring, wherein the rest process conditions and steps are completely the same as those in the embodiment 1.
Example 7:
a moistureproof process for corrugated base paper comprises the steps of reacting polyvinyl alcohol accounting for 1.1% of the total weight of a diluted glue base with phenolic resin accounting for 0.8% of the total weight of the diluted glue base to prepare a water-repellent agent, adding the water-repellent agent into the glue base prepared in the step S2, and fully and uniformly stirring, wherein the rest process conditions and steps are completely the same as those in the embodiment 1.
Example 8:
a moistureproof process for corrugated base paper comprises the steps of reacting polyvinyl alcohol accounting for 1.2% of the total weight of a diluted glue base with phenolic resin accounting for 0.8% of the total weight of the diluted glue base to prepare a water-repellent agent, adding the water-repellent agent into the glue base prepared in the step S2, and fully and uniformly stirring, wherein the rest process conditions and steps are completely the same as those in the embodiment 1.
Example 9:
a moistureproof process for corrugated base paper comprises the steps of reacting polyvinyl alcohol accounting for 1.0% of the total weight of a diluted glue base with phenolic resin accounting for 0.5% of the total weight of the diluted glue base to prepare a water-repellent agent, adding the water-repellent agent into the glue base prepared in the step S2, and fully and uniformly stirring, wherein the rest process conditions and steps are completely the same as those in the embodiment 1.
Example 10:
a moistureproof process for corrugated base paper comprises the steps of reacting polyvinyl alcohol accounting for 1.0% of the total weight of a diluted gum base with phenolic resin accounting for 0.7% of the total weight of the diluted gum base to prepare a water-repellent agent, adding the water-repellent agent into the gum base prepared in the step S2, and fully and uniformly stirring, wherein the rest process conditions and steps are completely the same as those in the embodiment 1.
Example 11:
a moistureproof process for corrugated base paper comprises the steps of reacting polyvinyl alcohol accounting for 1.0% of the total weight of a diluted gum base with phenolic resin accounting for 0.9% of the total weight of the diluted gum base to prepare a water-repellent agent, adding the water-repellent agent into the gum base prepared in the step S2, and fully and uniformly stirring, wherein the rest process conditions and steps are completely the same as those in the embodiment 1.
Example 12:
a moistureproof process for corrugated base paper comprises the steps of reacting polyvinyl alcohol accounting for 1.0% of the total weight of a diluted glue base with phenolic resin accounting for 1.0% of the total weight of the diluted glue base to prepare a water-repellent agent, adding the water-repellent agent into the glue base prepared in the step S2, and fully and uniformly stirring, wherein the rest process conditions and steps are completely the same as those in the embodiment 1.
And (3) experimental comparison:
for starch glue, after the starch glue is applied to paper, the water resistance of the paper is mainly influenced, the direct reaction of the water resistance is the moisture regain, and the moisture regain directly influences the ring crush strength of the paper, so that two parameters of the moisture regain and the ring crush strength of the paper need to be tested in the experimental process.
Meanwhile, because the paper is in a semi-dry state during sizing, the water content of the paper is still high, and therefore the paper needs to be dried subsequently. Since the starch glue can prevent external water from permeating into the paper, the water in the paper can be prevented from being separated out, and therefore the amount of steam consumed in drying after the paper is sized needs to be considered so as to control the production cost.
In the experiment, the starch glue prepared in the above examples 1 to 12 is applied to the same wet paper in continuous production to form a glue applying section with a length of 3m, and the interval between two adjacent glue applying sections is at least 2 m. After the sizing is complete, the wet paper is dried and the time taken for these size sections to dry is recorded (steam feed rate is equal and steam consumption can be calculated from time).
Meanwhile, paper sheets with the size of 0.2mX0.2m are cut out from each glue applying section after drying to manufacture 20 corrugated boards, and the moisture regain test and the ring crush strength test are carried out on the corrugated boards.
The moisture regain test is to place the corrugated board in a closed space with the relative humidity of 80% for suspension and standing for 48h, then take out the corrugated board to detect the moisture content of the corrugated board, and take the average value of the moisture content of the same group of corrugated boards as a table during recording.
And the ring crush strength test is to roll the corrugated board into a cylinder shape, then place the cylinder corrugated board on the ring crush strength tester to do the compression strength test, record and make the average value of the same group of corrugated board compression strength as the table.
Meanwhile, after the paper is made into the corrugated case, characters and patterns may need to be printed on the corrugated case, the water resistance of the paper directly affects the adhesion and the definition of printing ink, so that the characters need to be printed on the corrugated board, the definition and the adhesion of the characters are observed and recorded, and the specific performance characterization summary data is shown in table 1.
TABLE 1 summary of the drying time of wet paper, the moisture regain and the ring crush strength of corrugated cardboard
Comparing the data of examples 1 to 4 in table 1, it can be seen that the improvement of the moisture resistance of the corrugated board is not obvious although the polyvinyl alcohol alone or the phenolic resin alone is improved, and the improvement of the moisture resistance of the paper by the phenolic resin is larger than that of the polyvinyl alcohol.
Comparing the data of embodiment 1 to embodiment 12 in table 1, it can be seen that, the improvement effect of the combined action of polyvinyl alcohol and phenolic resin on the moisture resistance of paper is obviously stronger than that of the single action, because the polyvinyl alcohol and phenolic resin can be hydroformed by the phenolic resin after contacting to form a network-like molecular structure, and after the macromolecules permeate into the paper, the macromolecules can wrap the paper, block the permeation of water vapor, and thus can play a good moisture-proof role on the paper.
As can be seen by continuously comparing the data in table 1, as the content of polyvinyl alcohol and phenolic resin increases, the moisture regain of paper gradually decreases, the ring crush strength gradually increases, but the time required for drying paper is greatly prolonged (the steam consumption is continuously increased), and the clarity of text printing and the adhesion of ink also gradually decrease, because the paper ink needs to penetrate into the surface of paper to mark the paper, and if the ink cannot penetrate, it is difficult to leave clear text marks on the paper.
As can be seen from the data in the table, the addition amount of polyvinyl alcohol is 1% or less, and the improvement effect on the various properties of the paper is not obvious, and considering that polyvinyl alcohol has slight toxicity, the addition amount is preferably 1%. Meanwhile, although the moisture resistance and the ring crush strength of the paper are continuously enhanced along with the increase of the addition amount of the phenolic resin, when the addition amount of the phenolic resin reaches more than 0.8 percent, the moisture resistance and the ring crush strength of the paper can be slowly improved by increasing the content, but the promotion effect is not obvious, the steam consumption during the drying of the paper is greatly increased, the character printing definition and the ink adhesion force of the paper are continuously reduced, and the addition amount of the phenolic resin is preferably 0.8 percent from the aspects of economy and usability.
In summary, the optimal proportion for improving the comprehensive performance of the paper is selected to be 1% of the addition amount of the polyvinyl alcohol and 0.8% of the addition amount of the phenolic resin.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (5)
1. A damp-proof process for corrugated base paper comprises the following steps:
s1, making a gum base, dissolving and mixing starch and ferric ion salt in water, and then heating and stirring the mixture until the starch is gelatinized to obtain the gum base;
s2 gum base dilution, conveying the gum base prepared in the step S1 to a dilution barrel, adding water for dilution, and pumping the diluted gum base to a supply barrel for standby;
s3, preparing into gel, adding water repellent agent into the diluted gum base in the step S2, and mixing uniformly to obtain gel;
the water repellent agent comprises polyvinyl alcohol and phenolic resin, and the specific preparation method comprises the following steps: firstly, heating polyvinyl alcohol to 70-80 ℃, then slowly adding phenolic resin into the polyvinyl alcohol, slowly and continuously stirring the solution in the adding process, and continuously stirring for 10-20 min under heat preservation after the phenolic resin is added;
the addition amount of the polyvinyl alcohol is 0.8-1.2% of the total weight of the diluted gum base;
the addition amount of the phenolic resin is 0.7-1.0% of the total weight of the diluted gum base;
and S4, sizing paper pulp, namely spraying the glue prepared in the step S3 on wet paper uniformly, spraying the glue twice back and forth, and performing strong suction on one side of the wet paper, which is opposite to a spraying surface, for 5-10S, wherein the step is a primary sizing process, and the wet paper pulp is squeezed and drained to prepare the corrugated base paper by sizing the paper pulp for three times in total.
2. The corrugated medium moisture-proof process according to claim 1, characterized in that: in step S1, the specific preparation method of the gum base includes: mixing starch and warm water in a ratio of 1:1, adding 10-15% of ferric ion salt in weight of starch into a starch turbid liquid, fully mixing and stirring to form a suspension solution, slowly heating the starch solution to 90-95 ℃, preserving heat for 15-20 min, and continuously keeping stirring the starch solution in the heating process.
3. The corrugated medium moisture-proof process according to claim 2, characterized in that: before adding the iron ion salt, glacial acetic acid is added to the starch solution to adjust the pH value of the starch solution to 6-7.
4. The corrugated medium moisture-proof process according to claim 2, characterized in that: the specific heating method of the starch solution comprises the following steps: taking steam as a heat source, firstly heating the starch solution to 65 ℃ at the heating rate of 5 ℃/min, then heating the starch solution to 90 ℃ at the heating rate of 3 ℃/min, then heating the starch solution to 95 ℃ at the heating rate of 2 ℃/min, and preserving heat for 15min to fully gelatinize the starch.
5. The corrugated medium moisture-proof process according to claim 1, characterized in that: the concentration of the diluted gum base in the step S2 is 6-8%.
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| CN201910673195.9A CN110344278B (en) | 2019-07-24 | 2019-07-24 | Damp-proof process for corrugated base paper |
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| CN201910673195.9A CN110344278B (en) | 2019-07-24 | 2019-07-24 | Damp-proof process for corrugated base paper |
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| CN110344278B true CN110344278B (en) | 2021-08-20 |
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