CN111501389A - Method for manufacturing cotton pulp hot-pressing liner paper and hot-pressing liner paper obtained by method - Google Patents
Method for manufacturing cotton pulp hot-pressing liner paper and hot-pressing liner paper obtained by method Download PDFInfo
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- CN111501389A CN111501389A CN202010290788.XA CN202010290788A CN111501389A CN 111501389 A CN111501389 A CN 111501389A CN 202010290788 A CN202010290788 A CN 202010290788A CN 111501389 A CN111501389 A CN 111501389A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/34—Kneading or mixing; Pulpers
- D21B1/345—Pulpers
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
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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
- D21H21/34—Ignifugeants
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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
- 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
- D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
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Abstract
The invention provides a method for manufacturing cotton pulp hot-pressing liner paper, which takes pure cotton pulp or cotton pulp and other pulp (such as wood pulp, hemp pulp, bamboo pulp and the like) mixed according to different proportions as raw materials, and adopts a method of adding pulp in an internal machine or outside the internal machine, namely after the wet paper is formed, a high-temperature resistant additive is coated or soaked on the surface of the paper, so as to improve the high-temperature resistance and folding resistance of the product and save the dosage of the additive. Because the cotton pulp is used, no additional chemical auxiliary agents such as wet strength agent, retention aid, adhesive, dry strength agent and the like are added in the manufacturing process, and the overall performance, such as high temperature resistance, is improved from the raw materials. Since there is no hot-pressed paper made of cotton pulp in the market at present, most of them are kraft paper made of wood pulp or a cushion pad made of composite fiber. Compared with kraft paper, the hot-pressed paper made of cotton pulp has longer service life, and the raw materials and the manufacturing process are more environment-friendly.
Description
Technical Field
The invention relates to the technical field of special paper, in particular to a method for manufacturing cotton pulp hot-pressing liner paper (also called hot-pressing layer liner paper) and the hot-pressing liner paper obtained by the method.
Background
At present, hot-pressing buffer materials are needed to be used in the FPC (flexible printed circuit) industry, the PCB (printed circuit board) industry, the copper-clad plate industry and the laminated plate industry. Specifically, in the circuit board pressing process, because the actual operating temperature is high (at present, 190-260 ℃, the operating temperature is higher after 5G and new technology birth), and the operating pressure is high, in order to achieve the effect of uniformly conducting the temperature and the pressure, a hot-pressing buffer material must be added in the production process, and the temperature and the pressure are uniformly conducted to the electronic circuit board. The quality of the hot-pressing buffer material directly influences the quality of a working condition product, such as the definition degree of a circuit board, the grade of the circuit board and other evaluation standards. Therefore, the hot-pressing buffer material is an indispensable consumable in the production process. The application range is wide.
At present, hot-pressing buffer materials used in most factories in China are hot-pressing kraft paper or hot-pressing buffer pads. Wherein the hot-pressed kraft paper is made of sulfite natural wood pulp. In order to save cost, the wood pulp is prepared by proportionally mixing fresh wood pulp and recycled wood pulp (obtained by secondary defibering of used hot-pressed kraft paper). In the production process, various auxiliary agents such as a wet strength agent, a retention aid, an adhesive, a temperature-resistant auxiliary agent, a dry strength agent and the like need to be added, which seriously affects the convenience of actual operation, such as generation of pungent and harmful odor during use and the service life of the hot-pressed kraft paper. And the material can be crushed and seriously carbonized at most three times, namely the material can not be used continuously.
The hot-pressing buffer cushion is made of chemical composite materials. The feature is reusable, but not easy to replace and test. And the performance of the composite material can be mutated after the composite material is used for many times in a high-temperature and high-pressure environment, so that the actual production is uncontrollably influenced. The cost of the hot press cushions is relatively high and are still in an unstable testing phase at present. Therefore, a hot-pressing buffer material with more environmentally-friendly raw materials and manufacturing process and longer service life is needed.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The first purpose of the invention is to provide a method for manufacturing cotton pulp hot-pressing liner paper.
The second purpose of the invention is to provide the hot-pressing liner paper obtained by the method.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the invention relates to a method for manufacturing cotton pulp hot-pressing liner paper, which comprises the following steps:
(1) feeding the papermaking raw material into a hydrapulper for defibering to obtain first pulp;
preferably, the papermaking raw material is cotton pulp or mixed pulp of the cotton pulp and other pulp, and the other pulp is selected from at least one of wood pulp, hemp pulp and bamboo pulp. When the papermaking raw material is mixed pulp of cotton pulp and other pulp, the mass percentage content of the cotton pulp is more than or equal to 20%.
Preferably, the fluffing time is more than or equal to 2 h.
(2) Feeding the first pulp into continuous pulp grinding equipment for grinding to obtain second pulp;
preferably, the beating degree of the refining is 15-45 DEG SR.
(3) Feeding the second slurry into a pressure screen, and screening short and fine fibers and broken fibers to obtain a third slurry;
(4) feeding the third slurry into a paper machine, and performing paper making and forming to obtain wet paper sheets;
(5) feeding said wet web to a first multi-dryer section for a first drying step;
preferably, the moisture content in the paper after the first step of drying is less than or equal to 15 percent, so as to meet the dipping requirement.
(6) Sending the paper meeting the dipping requirement into an auxiliary agent dipping tank, and coating a high-temperature-resistant auxiliary agent on the surface of the paper;
preferably, the high-temperature resistant auxiliary agent is an inorganic flame retardant or a halogen-free flame retardant, and the inorganic flame retardant is at least one selected from calcium sulfate, hydroxyapatite, aluminum silicate, silicon dioxide, aluminum oxide, zirconium hydroxide and borax.
Preferably, the high temperature resistant assistant is mixed with water to prepare coating slurry, and the coating mode is selected from one of roll coating, air knife coating, blade coating and dipping coating.
Preferably, the coating weight of the high-temperature-resistant auxiliary agent on the surface of paper is 2-10 g/m2。
(7) Conveying the paper coated with the high-temperature-resistant auxiliary agent to a second group of multi-drying-cylinder drying part for second-step drying;
preferably, the moisture content in the paper after the second step of drying is less than or equal to 5 percent.
(8) And (4) feeding the paper dried in the second step into a calendaring part, and then reeling and slitting to obtain the cotton pulp hot-pressing liner paper.
The invention also relates to the hot-pressing liner paper obtained by the method. The specification of the cotton pulp hot-pressing liner paper is 120-350 g/m2The working temperature is 140-210 ℃, the transverse tensile strength is 2-4 kN/m, and the longitudinal tensile strength is 3.5-7 kN/m.
The invention has the beneficial effects that:
the invention provides a method for manufacturing cotton pulp hot-pressing liner paper, which takes pure cotton pulp or cotton pulp and other pulp (such as wood pulp, hemp pulp, bamboo pulp and the like) mixed according to different proportions as raw materials, and adopts a method of adding pulp in an internal machine or outside the internal machine, namely after the wet paper is formed, a high-temperature resistant additive is coated or soaked on the surface of the paper, so as to improve the high-temperature resistance and folding resistance of the product and save the dosage of the additive. Because the cotton pulp is used, no additional chemical auxiliary agents such as wet strength agent, retention aid, adhesive, dry strength agent and the like are added in the manufacturing process, and the overall performance, such as high temperature resistance, is improved from the raw materials.
Since there is no hot-pressed paper made of cotton pulp in the market at present, most of them are kraft paper made of wood pulp or a cushion pad made of composite fiber. Compared with kraft paper, the hot-pressed paper made of cotton pulp has longer service life, and the raw materials and the manufacturing process are more environment-friendly.
Drawings
FIG. 1 is a flow chart of the method of making the cotton pulp thermal press linered paper of the present invention.
FIG. 2 is a schematic view of the pressing process of the cotton pulp hot-pressed liner paper tested in the present invention.
Among them, 11-polypropylene (PP) sheet;
21-a first mirror steel plate; 22-a second mirror steel plate;
23-a third mirror steel plate; 24-a fourth mirror steel plate;
31, 32-paper to be tested.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The embodiment of the invention relates to a method for manufacturing cotton pulp hot-pressing liner paper, the process flow of which is shown in figure 1, and the method comprises the following steps:
(1) feeding the papermaking raw material into a hydrapulper for defibering to obtain first pulp;
in one embodiment of the present invention, the paper making raw material is cotton pulp or a mixed pulp of the cotton pulp and other pulp selected from at least one of wood pulp, hemp pulp, bamboo pulp.
The wood pulp is made of logs, the growth period of the logs is 5-10 years, the growth period is long, and excessive logging of the logs can affect the environment and cause environmental pollution and the like. Whereas the cotton pulp is made of cotton linters, cotton is an annual plant. Therefore, compared with wood pulp, the cotton pulp has short growth period, small influence on the environment, stable yield, convenient large-scale mechanical operation and more market competitiveness.
Under normal pressure, the temperature of thermal decomposition of pure wood pulp fibers is 180-190 ℃, the temperature of kraft pulp is 190-200 ℃, and the temperature of cotton pulp is 220 ℃. Therefore, the cotton pulp is selected to manufacture the hot-pressed paper, and the overall performance, such as high temperature resistance, is improved from the raw materials. And from the self performance of the plant fiber, the cotton pulp fiber has better folding endurance, rebound resilience and water absorption, and the fiber strength is superior to wood pulp, so the cotton pulp fiber has more stable use performance, has stronger toughness in high-temperature and high-pressure environments, is not easy to carbonize, and can obviously prolong the service life of the hot-pressing liner paper. When the papermaking raw material is mixed pulp of cotton pulp and other pulp, the mass percentage content of the cotton pulp is more than or equal to 20 percent, otherwise, the high temperature resistant requirement cannot be met.
In one embodiment of the present invention, the cotton pulp is flocculent pulp or pulp sheet, which is required to be prepared into dissolving pulp. It is therefore necessary to feed the paper stock into the hydropulper for fluffing through the stock inlet. The required fluffing time is more than or equal to 2 hours because of the longer cotton pulp fiber. Sending the fully defibered slurry into a first slurry storage tank to wait for the next working procedure;
(2) feeding the first pulp into continuous pulp grinding equipment for grinding to obtain second pulp;
in one embodiment of the invention, the first stock is delivered from the stock chest No. one and fed to a continuous refining apparatus for refining, which acts to properly sever and devillicate the pulp fibers. Proper pulping specific pressure can be set according to the adding proportion of the cotton pulp and other pulp in the papermaking raw materials, and the grinded second pulp is sent into a second pulp storage tank.
In one embodiment of the invention, 4 phi 450 type double disc mills are selected to be used in series, the pulping current is respectively set to be 85A, 130A and 130A, and the pulp concentration is set to be 1-2%.
The applicant finds that the refined cotton pulp fiber has better devillicate brooming condition, and the bonding force between the fibers is stronger and far superior to the self-bonding force of wood pulp. And due to the property of the wood pulp, the wood pulp cannot be beaten at high beating speed and keeps proper fiber length. Therefore, in the manufacturing process of the cotton pulp paper, wet strength agent is not needed to be added into the pulp to form the paper, and the paper can be well combined by the Van der Waals force and the hydrogen bond formed by the paper. Therefore, the invention omits wet strength agent in the manufacturing process of the cotton pulp paper, saves cost, provides convenience for water circulation, paper pulp circulation and dry loss treatment without using chemical auxiliary agent, and belongs to environment-friendly production process. The recycling of the paper after use is facilitated without using a wet strength agent, which is particularly characterized in that in the recycling treatment process, a wet strength releasing agent is not required to be added for high-temperature defibering, so that the time and the cost are greatly saved, a new chemical reagent is not required to be added, and great benefit is brought to environmental protection.
In addition, because the refined cotton pulp has good associativity, the addition of adhesive for fiber bonding is not needed in the forming process. Therefore, the production of odor can be reduced in the production process, the uniformity of the product is improved, the heating uniformity in the production process is improved, and the method has important significance for environmental protection.
Furthermore, because the cotton pulp has excellent binding force after pulping, after the product is formed, a dry strength agent, such as modified acrylic acid and modified starch dry strength agents, does not need to be added to improve the product strength, thereby being convenient to recover and saving the cost;
in one embodiment of the invention, the beating degree of the refining is 15-45 DEG SR. The beating degree refers to the length of the beaten fibers, and the longer the beating time is; the larger the beating degree value, the shorter the fiber. The pulp obtained by the beating degree can not only keep a certain fiber length and obtain better air permeability, but also improve hydrogen bonds and Van der Waals force between fibers, so that the fibers have good bonding force.
(3) Feeding the second slurry into a pressure screen, and screening short and fine fibers and broken fibers to obtain a third slurry;
in one embodiment of the invention, the second pulp (where auxiliary materials such as dye or special fiber can be added) output from the second pulp storage tank is sent to the pre-papermaking tank, so that the fiber proportion and concentration of the pulp are stable and meet the papermaking requirements, and then the pulp is sent to a special pressure sieve for further single fiber homogenization.
(4) Feeding the third slurry into a multi-cylinder paper making machine with a long net, a circular net or an inclined net, and performing paper making and forming to obtain wet paper sheets;
(5) conveying the wet paper to a first group of multi-dryer drying parts for first-step drying, wherein the preferable drying temperature is 80-100 ℃, so that the moisture content in the paper is less than or equal to 15%, and the dipping requirement is met;
(6) sending the paper meeting the dipping requirement into an auxiliary agent dipping tank, and coating a high-temperature-resistant auxiliary agent on the surface of the paper;
in one embodiment of the present invention, the high temperature resistant auxiliary agent is an inorganic flame retardant or a halogen-free flame retardant. The inorganic flame retardant is at least one selected from calcium sulfate (such as calcium sulfate dihydrate, calcium sulfate hemihydrate, and anhydrous soluble calcium sulfate), hydroxyapatite, aluminum silicate, silicon dioxide, aluminum oxide, zirconium hydroxide, and borax. The material can improve the high temperature resistance and the service life of the product. The increase in service life can optimize operations in the actual production process, such as the replacement of cushioning material. The buffer material with short service life needs to be replaced by a plurality of buffer materials at a time, and in a factory without full automation, replacement needs to be clearly replaced by counting of workers at each time, so that human errors are introduced. And the cotton pulp hot-pressing liner paper with long service life only needs to replace 1-2 pieces of buffer material every time, so that the operation is convenient.
Furthermore, the high temperature resistant auxiliary agent can be added in two ways, namely, the slurry is added in and the slurry is added outside. The addition of the auxiliary agent into the pulp is to add the auxiliary agent before the paper making and forming, and chemical auxiliary agents such as a stabilizer, a forming agent, a dispersing agent and the like are added to increase the production cost and the post-treatment process because the uniform dispersion of the auxiliary agent in the paper is realized. The invention selects the mode of adding pulp, namely mixing the high-temperature resistant auxiliary agent with water to prepare coating pulp, and then coating the coating pulp on the surface of paper. The coating method is at least one selected from roll coating, air knife coating, blade coating and dip coating. In order to meet the requirement of high temperature resistance, the coating weight of the high temperature resistant auxiliary agent on the surface of paper is 2-10 g/m2。
(7) The paper coated with the high-temperature-resistant auxiliary agent is sent to a second group of multi-dryer drying part for second-step drying, so that the moisture content in the paper is less than or equal to 5 percent;
(8) and (3) conveying the paper dried in the second step to a calendaring part to improve the surface smoothness of the paper, and properly adjusting the thickness index of the paper according to the thickness requirement of the paper. And feeding the calendered paper into a coiling part for coiling, and then slitting to a specified specification according to customer requirements to obtain the cotton pulp hot-pressing liner paper.
The specification of the cotton pulp hot-pressing liner paper obtained by the invention is 120-350 g/m2The working temperature is 140-210 ℃, the transverse tensile strength is 2-4 kN/m, and the longitudinal tensile strength is 3.5-7 kN/m. The temperature of 140-210 ℃ is 3 hours each time, and the working pressure is 35kg/cm2Can be used for 7 to 8 times under the condition (2).
In practice, the high tensile strength of the cotton pulp hot press linered paper is not required. The paper has no industrial standard, most tests and detections are qualitative detections, for example, comparison tests of various products are carried out at specified temperature and pressure, the condition of the paper is judged after the same group of tests are finished, whether the paper can be used continuously or not is judged, and the service life of the paper is judged.
Compared with the hot-pressing buffer pad, the service life of the hot-pressing buffer pad is too long, so that the test is difficult. If carry out the life test under the high temperature high pressure to the hot pressing blotter, the actual test operating mode is:
1) placing the hot-pressing cushion pad under a simulated working condition, setting a required temperature and pressure environment, and performing pressing simulation of a heating time period;
2) after the set temperature is reached, constant temperature operation is carried out, time setting is carried out according to the actual working condition, and the verification time of the invention is 2 hours;
3) and after the constant temperature working time is finished, carrying out a cooling process, then taking out the paper, and finishing the whole process.
The whole testing process lasts for 3-4 hours, the working time of the testing machine in one day is 8-10 hours, 3 groups of data are tested at most in one day, and the cushion can be accepted by the market only when the use times of the cushion are more than 500 times. The number of tests of 500 times is equal to half a year of test time, the time cost is very high, and therefore it is very difficult to perform the tests.
It is also not suitable to be used for actual work with the hot pressing blotter, because the blotter is formed by the chemical products complex, has fixed thickness and conductivity coefficient, and unable many stacks use, does not possess the nimble performance of cotton pulp hot pressing liner paper. The thickness of the cotton pulp hot-pressing liner paper can be adjusted through production, the cotton pulp hot-pressing liner paper is very convenient, and the cost cannot be increased, so that the required thermal conductivity can be achieved by changing the number or the thickness of the cotton pulp hot-pressing liner paper, and the cotton pulp hot-pressing liner paper is matched with actual production. The cotton pulp hot-pressing liner paper can be better matched and adapted to the working conditions required by actual production, and is flexible and convenient to adjust and low in replacement cost.
Example 1
The cotton pulp hot-pressing liner paper is prepared by the following method:
(1) feeding 100% pure cotton pulp into a hydrapulper for defibering to obtain first pulp;
(2) feeding the first pulp into continuous pulping equipment for pulping, wherein the beating degree of the pulping is 15-45 DEG SR, and obtaining second pulp;
(3) feeding the second slurry into a pressure screen, and screening short and fine fibers and broken fibers to obtain a third slurry;
(4) feeding the third slurry into a multi-cylinder paper making machine with a long net, and performing paper making molding to obtain wet paper sheets;
(5) conveying the wet paper into a first group of multi-dryer drying parts for first-step drying, wherein the drying temperature is 80-100 ℃, so that the moisture content in the paper is less than or equal to 15%, and the dipping requirement is met;
(6) sending the paper meeting the dipping requirement into an auxiliary agent dipping tank, coating a high-temperature-resistant auxiliary agent calcium sulfate dihydrate on the surface of the paper, wherein the coating amount of the high-temperature-resistant auxiliary agent on the surface of the paper is 3-5 g/m2；
(7) The paper coated with the high-temperature-resistant auxiliary agent is sent to a second group of multi-dryer drying part for second-step drying, so that the moisture content in the paper is less than or equal to 5 percent;
(8) and (3) feeding the paper dried in the second step into a calendaring part, feeding the calendered paper into a coiling part for coiling, and slitting to a specified specification to obtain the cotton pulp hot-pressing liner paper.
Example 2
The cotton pulp hot-pressing liner paper adopts 80 percent of cotton pulp and 20 percent of wood pulp, and the other preparation processes are the same as the example 1.
Example 3
The cotton pulp hot-pressing liner paper adopts 60 percent of cotton pulp and 40 percent of wood pulp, and the other preparation processes are the same as the example 1.
Example 4
The cotton pulp hot-pressing liner paper adopts 20 percent of cotton pulp and 80 percent of wood pulp, and the other preparation processes are the same as the example 1.
Example 5
The cotton pulp hot-pressing liner paper adopts 10 percent of cotton pulp and 90 percent of wood pulp, and the other preparation processes are the same as the example 1.
Example 6
The cotton pulp hot-pressing liner paper is prepared by adding a high-temperature resistant auxiliary agent into pulp, and the other preparation processes are the same as those in example 1.
The test process of the cotton pulp hot-pressing liner paper comprises the following steps:
(1) taking a plurality of papers to be detected, cutting the papers according to the size of an actual experiment operating table, and adjusting the water content to be less than or equal to 5% for later use;
(2) carrying out actual working condition simulation on a test machine capable of pressurizing and heating, adjusting test pressure, and carrying out temperature adjustment according to actual working temperature;
(3) according to one condition of actual working conditions, a plurality of pieces of paper to be tested are selected for simulation test, and the plurality of pieces of paper patterns are overlapped together and put into a testing machine with set temperature and pressure for pressing. The press-fit schematic diagram is shown in fig. 2, two mirror surface steel plates are respectively placed on the upper surface and the lower surface of a polypropylene (PP) plate 11, and the two mirror surface steel plates are sequentially named as a first mirror surface steel plate 21, a second mirror surface steel plate 22, a third mirror surface steel plate 23 and a fourth mirror surface steel plate 24 in the sequence from top to bottom in fig. 2, wherein the first mirror surface steel plate 21 and the fourth mirror surface steel plate 24 are located on the outermost sides, and the second mirror surface steel plate 22 and the third mirror surface steel plate 23 are respectively attached to the PP plate 11. Then, paper 31 to be measured is put between the first mirror steel plate 21 and the second mirror steel plate 22, paper 32 to be measured is put between the third mirror steel plate 23 and the fourth mirror steel plate 24, and then a heating source is applied to the first mirror steel plate 21 and the fourth mirror steel plate 24, namely the two mirror steel plates on the outermost sides for pressing;
(4) keeping the working time of 2 hours (120 minutes) in the environment, and adding the time of temperature rise and temperature fall for 3 hours in total;
(5) after 120 minutes, the press was stopped, the pressure was released and the paper was removed and observed for carbonization and folding resistance. And simultaneously taking out the paper contacted with the upper laminated plate, and placing the appointed new paper according to the appointed drawing and placing sequence.
The drawing and placing sequence designed by the invention is 18 to 2, namely the number of the paper 31 to be measured between the first mirror surface steel plate 21 and the second mirror surface steel plate 22 is 18, and the number of the paper 32 to be measured between the third mirror surface steel plate 23 and the fourth mirror surface steel plate 24 is also 18. After each operation is finished, two pieces of paper close to the heating source in the paper to be detected 31 and the paper to be detected 32 are drawn out and discarded, two pieces of new paper are respectively put in the positions close to the PP plate, and the working condition is repeatedly simulated for a plurality of times. Stopping the test until one or more of a series of conditions of plate sticking, crushing, high carbonization, perforation and the like appear on the paper close to the heating source, wherein the cycle times are the usable times under the working condition;
(6) repeating the step (4), and observing the condition of the recording paper and the replacement times;
(7) and stopping the experiment until the uppermost layer of paper is seriously stuck, damaged and carbonized, wherein the times are the times of repeated use of the product under the working condition, and the obtained final paper is properly recycled and kept for subsequent experimental analysis.
The single working time (including the heating and cooling time) of the test is 3 hours, the working temperature is increased from 140 ℃ to 210 ℃, and the working pressure is 35kg/cm2. The paper commonly used in the market and the cotton pulp hot-pressing liner paper of the invention are tested under the same conditions to obtain the use times of the final paper, as shown in table 1.
TABLE 1
Wherein, the common kraft paper in the market is the kraft paper provided by Hangzhou Lin' an wave paper industry in China. The gram weight of the material is 160g/m2(ii) a The imported hot-pressed paper is provided by German Interface company and has a gram weight of 215g/m2(ii) a Examples 1 to 5 are cotton pulp hot-pressed linersheet of the present invention, which has a grammage of 155g/m2(ii) a The tests described above were all performed in 18 pump 2 mode of operation.
Table 1 reflects the carbonization of the paper to be tested under the same service time, heating temperature and working pressure, which shows that the performance of the cotton pulp hot-pressed liner paper provided in example 1 is slightly better than that of the imported hot-pressed paper. When the content of the cotton pulp in the hot-pressing liner paper is gradually reduced, the high-temperature resistance is also gradually reduced. When the cotton pulp content is reduced by 10%, the high temperature resistance of the hot-pressing liner paper is the same as that of kraft paper, so that the cotton pulp content in the hot-pressing liner paper is limited to be more than or equal to 20%. Meanwhile, the high-temperature resistant auxiliary agent added into the pulp can also reduce the high-temperature resistance of the hot-pressing liner paper. The cost of the cotton pulp hot-pressed liner paper used in the embodiment 1 of the invention is 1/3 of domestic kraft paper and 1/2 of imported hot-pressed paper, calculated by using times and gram weight.
The delivery standard of the performance of the cotton pulp hot-pressing liner paper is shown in the table 2, and parameters in the table can be adjusted according to product requirements.
TABLE 2
The above standards were obtained according to the following national standards:
sampling of GB/T450 paper and paperboard samples and measurement of longitudinal and transverse directions and front and back sides of samples
Measurement of GB/T451.1 paper and paperboard size and skewness
GB/T451.2 determination of basis weight of paper and paperboard
GB/T451.3 determination of paper and paperboard thickness
Determination of smoothness of GB/T456 paper and paperboard (Buick method)
Measurement of GB/T458 paper and paperboard air permeability
Determination of moisture in GB/T462 paper, paperboard and pulp analysis samples
GB/T1541 determination of paper and paperboard dust degree
Determination of acidity or alkalinity of GB/T1545 paper, paperboard and pulp water extraction liquid
Determination of water-soluble chlorides in GB/T2678.2 paper, board and pulp
GB/T2678.6 determination of water-soluble sulfates in paper, board and pulp (conductometric titration)
GB/T2828.1 count sample inspection program first part batch-by-batch inspection sample plan retrieved by received quality limits (AQ L)
Package and sign of GB/T10342 paper
Standard atmospheric conditions for processing and testing GB/T10739 paper, paperboard and pulp samples
Determination of the tensile Strength of GB/T12914 paper and paperboard
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The method for manufacturing the cotton pulp hot-pressing liner paper is characterized by comprising the following steps of:
(1) feeding the papermaking raw material into a hydrapulper for defibering to obtain first pulp;
(2) feeding the first pulp into continuous pulp grinding equipment for grinding to obtain second pulp;
(3) feeding the second slurry into a pressure screen, and screening short and fine fibers and broken fibers to obtain a third slurry;
(4) feeding the third slurry into a paper machine, and performing paper making and forming to obtain wet paper sheets;
(5) feeding said wet web to a first multi-dryer section for a first drying step;
(6) sending the paper meeting the dipping requirement into an auxiliary agent dipping tank, and coating a high-temperature-resistant auxiliary agent on the surface of the paper;
(7) conveying the paper coated with the high-temperature-resistant auxiliary agent to a second group of multi-drying-cylinder drying part for second-step drying;
(8) and (4) feeding the paper dried in the second step into a calendaring part, and then reeling and slitting to obtain the cotton pulp hot-pressing liner paper.
2. The method according to claim 1, wherein in the step (1), the papermaking raw material is cotton pulp or a mixed pulp of the cotton pulp and other pulp selected from at least one of wood pulp, hemp pulp and bamboo pulp.
3. The method according to claim 1, wherein in the step (1), when the papermaking raw material is a mixed pulp of cotton pulp and other pulp, the mass percentage of the cotton pulp is more than or equal to 20%.
4. The method according to claim 1, characterized in that in step (2) the beating degree of the refining is 15-45 ° SR.
5. The method of claim 1 wherein in step (5) the moisture content of the paper after said first drying is less than or equal to 15%.
6. The method according to claim 1, wherein in the step (6), the high temperature resistant auxiliary agent is an inorganic flame retardant or a halogen-free flame retardant, and the inorganic flame retardant is at least one selected from calcium sulfate, hydroxyapatite, aluminum silicate, silicon dioxide, aluminum oxide, zirconium hydroxide and borax.
7. The method according to claim 1, wherein in the step (6), the high temperature resistant auxiliary agent is mixed with water to prepare a coating slurry, and the coating is performed by one selected from roll coating, air knife coating, blade coating and dip coating.
8. The method according to claim 1, wherein in the step (6), the high temperature resistant auxiliary agent is coated on the surface of the paper in an amount of 2-10 g/m2。
9. The method of claim 1 wherein in step (7) the moisture content of the paper after said second drying is less than or equal to 5%.
10. The cotton pulp hot-pressed liner paper prepared by the method according to any one of claims 1 to 9, wherein the specification of the cotton pulp hot-pressed liner paper is 120-350 g/m2The working temperature is 140-210 ℃, the transverse tensile strength is 2-4 kN/m, and the longitudinal tensile strength is 3.5-7 kN/m.
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| CN113863045A (en) * | 2021-10-18 | 2021-12-31 | 岳阳林纸股份有限公司 | Manufacturing method of 5G circuit board diaphragm cushion paper and 5G circuit board diaphragm cushion paper |
| CN115652682A (en) * | 2022-08-23 | 2023-01-31 | 广东中晨电子科技有限公司 | Cotton pulp kraft paper for IC carrier plate and manufacturing method thereof |
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