CN117569119A - Water-absorbing paper and preparation method thereof - Google Patents

Water-absorbing paper and preparation method thereof Download PDF

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Publication number
CN117569119A
CN117569119A CN202311805815.2A CN202311805815A CN117569119A CN 117569119 A CN117569119 A CN 117569119A CN 202311805815 A CN202311805815 A CN 202311805815A CN 117569119 A CN117569119 A CN 117569119A
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CN
China
Prior art keywords
paper
pulp
water
absorbent
drying
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311805815.2A
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Chinese (zh)
Inventor
蔡绍雄
黄翠玉
谢正拔
陈青松
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujian Hengan Hygiene Material Co ltd
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Fujian Hengan Hygiene Material Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujian Hengan Hygiene Material Co ltd filed Critical Fujian Hengan Hygiene Material Co ltd
Priority to CN202311805815.2A priority Critical patent/CN117569119A/en
Publication of CN117569119A publication Critical patent/CN117569119A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • D21H27/002—Tissue paper; Absorbent paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • 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
    • D21B1/06—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods
    • D21B1/061—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods using cutting devices
    • 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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • 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
    • D21H23/24—Addition to the formed paper during paper manufacture
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Paper (AREA)

Abstract

The invention relates to a piece of absorbent paper and a preparation method thereof, comprising the following steps: s1, pulping softwood pulp and fluff pulp respectively, and then preparing pulp to obtain paper pulp; s2, removing water from the paper pulp prepared in the step S1 through a felt part, and drying to prepare dry paper; s3, uniformly broadcasting the macromolecule water-absorbent resin on the surface of the dry paper prepared in the step S2 to prepare the bottom paper; s4, removing water from the paper pulp prepared in the step S1 through a felt part to obtain surface paper pulp, pressing the surface paper pulp with the bottom paper prepared in the step S3, and sequentially drying, wrinkling and drying for the second time to obtain the absorbent paper. The invention optimizes the formula of the slurry and matches the process of dry paper, high polymer water-absorbent resin and wet paper pulp, so that the high polymer water-absorbent resin is tightly combined with softwood pulp and fluff pulp in the paper pulp, and the water absorption performance of the high polymer water-absorbent resin is prevented from being reduced in the wet paper making process, and the obtained water-absorbent paper has excellent comprehensive performance and can be used for producing sanitary products such as sanitary napkins, paper diapers and the like.

Description

Water-absorbing paper and preparation method thereof
Technical Field
The invention relates to the technical field of sanitary materials, in particular to water-absorbing paper and a preparation method thereof.
Background
The absorbent paper is used as a common household paper, and the main absorption function in the structure is high polymer absorbent resin and fiber materials. At present, the composite mode of the macromolecule water-absorbent resin and the fiber slurry is mainly divided into dry composite mode and wet composite mode. The dry method compounding mainly has the problems that the contact between the macromolecule water-absorbing resin and the fiber material is insufficient, so that the water absorption capacity of the finished product water-absorbing paper is poor, and the like; in the wet composite preparation process, the water content of the wet paper pulp is high and the hydrophilicity of the high molecular water-absorbing resin is strong, so that the high molecular water-absorbing resin can quickly absorb the water in the wet paper pulp when the high molecular water-absorbing resin is mixed with the wet paper pulp, which not only can reduce the absorption performance of the high molecular water-absorbing resin, but also is unfavorable for the subsequent drying and dehumidifying procedures of the water-absorbing paper. In addition, the selection of the fiber variety and the proportion has a direct influence on the quality of the produced absorbent paper.
In view of this, the present invention has been made.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the invention provides a piece of absorbent paper and a preparation method thereof, which are used for solving the problems of poor absorption performance and the like of the absorbent paper prepared by the existing preparation process.
In order to solve the technical problems, the invention adopts the following technical scheme:
in one aspect, the present invention provides a method for preparing absorbent paper, comprising the steps of:
s1, pulping softwood pulp and fluff pulp respectively, and then preparing pulp to obtain paper pulp;
s2, removing water from the paper pulp prepared in the step S1 through a felt part, and drying to prepare dry paper;
s3, uniformly broadcasting the macromolecule water-absorbent resin on the surface of the dry paper prepared in the step S2 to prepare the bottom paper;
s4, removing water from the paper pulp prepared in the step S1 through a felt part to obtain surface paper pulp, pressing the surface paper pulp with the bottom paper prepared in the step S3, and sequentially drying, wrinkling and drying for the second time to obtain the absorbent paper.
According to the preparation method of the absorbent paper, the macromolecule absorbent resin is broadcast on the dry paper as the bottom layer and then is compounded with the surface wet paper pulp, so that the macromolecule absorbent resin can be prevented from excessively absorbing moisture, the water absorption capacity of the macromolecule absorbent resin is ensured, and the water removal pressure of the subsequent process is reduced. Meanwhile, the softwood pulp and the fluff pulp are selected as pulp raw materials and are mutually complemented, the fibers of the softwood pulp are longer, the fibers have good interweaving capacity, the water-absorbent paper is endowed with good tension resistance, the fibers are combined relatively loosely, the air permeability of the water-absorbent paper can be improved, but the permeation and diffusion properties of the water-absorbent paper are poor; the fluff of the fluff pulp can increase the softness, the fluffiness and the absorption and diffusion capacity of liquid such as moisture, blood and the like of the absorbent paper. The invention optimizes the formula of the slurry and matches the process of dry paper, high polymer water-absorbent resin and wet paper pulp, so that the high polymer water-absorbent resin is tightly combined with softwood pulp and fluff pulp in the paper pulp, and the water absorption performance of the high polymer water-absorbent resin is prevented from being reduced in the wet paper making process, and the obtained water-absorbent paper has excellent comprehensive performance and can be used for producing sanitary products such as sanitary napkins, paper diapers and the like.
Optionally, the method further comprises the steps of:
s5, coiling, slitting and packaging the absorbent paper prepared in the step S4 in sequence.
Optionally, in step S1, the softwood pulp and the fluff pulp are mixed in a mass ratio of 3:7-3:2 in the pulp preparing process.
From the above description, the present invention preferably uses the combination ratio of softwood pulp and fluff pulp to ensure excellent permeability of the absorbent paper.
Optionally, in the step S1, the concentration of the crushed pulp is 3-7wt%, and the time for crushing the pulp is 15-30min; and an auxiliary agent is added in the pulp mixing process, wherein the auxiliary agent comprises a softening agent and a bulking agent, and the dosage of the auxiliary agent accounts for 0.4-0.6% of the total mass of the mixed pulp.
Optionally, in step S2, the temperature of the drying is 120-150 ℃; the moisture content of the dry paper is 5-10%.
Optionally, in step S3, the polymer water absorbent resin is applied in an amount of 20-30g/m 2 。
Optionally, in step S4, the pressing pressure of the pressing is 0.3-0.5Mpa; the drying temperature of the primary drying is 110-135 ℃; the wrinkling rate in the wrinkling process is 6-10 degrees; the drying temperature of the secondary drying is 120-140 ℃; the water content of the absorbent paper is 5-12%.
In another aspect, the invention provides absorbent paper made by the method.
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 clearly and completely described below in connection with the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention provides a preparation method of absorbent paper, which comprises the following steps:
s1, pulping the softwood pulp and the fluff pulp respectively, and then preparing pulp to obtain the paper pulp.
In the pulp preparation process, the softwood pulp and the fluff pulp are mixed according to the mass ratio of 3:7-3:2.
The concentration of the crushed pulp is 3-7wt%, and the time for crushing pulp is 15-30min; and an auxiliary agent is added in the pulp mixing process, wherein the auxiliary agent comprises a softening agent and a bulking agent, and the dosage of the auxiliary agent accounts for 0.4-0.6% of the total mass of the mixed pulp.
S2, removing water from the paper pulp prepared in the step S1 through a felt part, and drying to prepare dry paper.
The temperature of the drying is 120-150 ℃; the moisture content of the dry paper is 5-10%.
In some preferred embodiments, the pulp is first pumped onto a paper machine, then pumped onto a felt for partial dewatering, then the felt and the pulp are conveyed to a drying cylinder through a transmission roller, the pulp surface is close to the drying cylinder, drying is carried out at 120-150 ℃, and dry paper with the water content of 5-10% is prepared and rolled for standby.
S3, uniformly broadcasting the high-molecular water-absorbing resin on the surface of the dry paper prepared in the step S2 to prepare the bottom paper.
The application amount of the high molecular water-absorbing resin is 20-30g/m 2 。
In some preferred embodiments, the dry paper is unreeled by a driving device and then conveyed to a macromolecule absorbent resin broadcasting device by a plurality of guide rollers, and the application amount of the macromolecule absorbent resin is controlled to be 20-30g/m by controlling the rotating speed of an application roller and the depth of a surface groove 2 And continuously and stably broadcasting the high molecular water-absorbing resin on the surface of the dry paper to prepare the base paper.
S4, removing water from the paper pulp prepared in the step S1 through a felt part to obtain surface paper pulp, pressing the surface paper pulp with the bottom paper prepared in the step S3, and sequentially drying, wrinkling and drying for the second time to obtain the absorbent paper.
The pressing pressure of the pressing is 0.3-0.5Mpa; the drying temperature of the primary drying is 110-135 ℃; the wrinkling rate in the wrinkling process is 6-10 degrees; the drying temperature of the secondary drying is 120-140 ℃; the water content of the absorbent paper is 5-12%.
In some preferred embodiments, the pressing pressure is controlled to be 0.3-0.5Mpa by a pressure roller during pressing, the pressed paper is conveyed to a drying cylinder, the bottom paper surface is pressed close to the drying cylinder to be dried at 110-135 ℃ for the first time, the wrinkling process is adjusted during stripping of the drying cylinder after drying, the wrinkling rate is controlled to be 6-10 ℃, the paper after wrinkling is conveyed to an oven through a mesh belt, and secondary hot air drying is carried out at 120-140 ℃ to obtain the absorbent paper with the moisture content of 5-12%.
The method further comprises the steps of:
s5, coiling, slitting and packaging the absorbent paper prepared in the step S4 in sequence.
Example 1
A preparation method of the absorbent paper comprises the following steps:
s1, respectively pulping softwood pulp and fluff pulp, wherein the concentration of the pulp is 5wt%, and the pulping time is 20min; and then the pulp is prepared according to the mass ratio of the softwood pulp to the fluff pulp of 3:2, and meanwhile, the softener and the leavening agent accounting for 0.4 percent of the total mass of the mixed pulp are added to prepare the paper pulp.
S2, firstly pumping the paper pulp prepared in the step S1 onto a paper machine, pumping the paper pulp to a felt part for removing water, conveying the felt and the paper pulp to a drying cylinder through a transmission roller, drying the paper pulp surface close to the drying cylinder at 130 ℃, preparing dry paper with the water content of 5-10%, and winding for standby.
S3, unreeling the dry paper prepared in the step S2 by a transmission device, conveying the unreeled dry paper to a high polymer water absorbent resin broadcasting device by a plurality of guide rollers, and controlling the application amount of the high polymer water absorbent resin to be 30g/m by controlling the rotating speed of an application roller and the depth of a surface groove 2 And continuously and stably broadcasting the high molecular water-absorbing resin on the surface of the dry paper to prepare the base paper.
S4, removing water from the paper pulp prepared in the step S1 through a felt part to obtain surface layer paper pulp, pressing the surface layer paper pulp with the bottom layer paper prepared in the step S3, controlling the pressing pressure to be 0.5Mpa through a pressure roller during pressing, conveying the pressed paper to a drying cylinder, drying the bottom layer paper surface close to the drying cylinder at 130 ℃ for the first time, adjusting a wrinkling process when the drying cylinder is peeled off after drying, controlling the wrinkling rate to be 10 degrees, conveying the wrinkled paper to an oven through a mesh belt, and drying the wrinkled paper through secondary hot air at 130 ℃ to obtain the water absorbing paper with the water content of 5-12%.
And S5, finally, coiling, slitting and packaging the absorbent paper prepared in the step S4 in sequence.
Example 2
The main difference between this example and example 1 is that the applied amount of the high molecular weight water-absorbent resin was 20g/m 2 。
Example 3
The main difference between this example and example 2 is that the mass ratio of softwood pulp to fluff pulp is 1:1.
Example 4
The main difference between this example and example 2 is that the mass ratio of softwood pulp to fluff pulp is 3:7.
Example 5
The main difference between this example and example 1 is that the applied amount of the high molecular weight water-absorbent resin was 25g/m 2 。
Example 6
The main difference between this example and example 1 is that the secondary drying temperature is 120 ℃.
Example 7
The main difference between this example and example 1 is that the secondary drying temperature was 140 ℃.
Comparative example 1
The main difference between this comparative example and example 2 is that fluff pulp is absent.
Comparative example 2
The main difference between this comparative example and example 2 is that the mass ratio of softwood pulp to fluff pulp is 7:3.
Comparative example 3
The main difference between this comparative example and example 1 is that the applied amount of the high molecular weight water-absorbent resin was 40g/m 2 。
Comparative example 4
The main difference between this comparative example and example 1 is that the secondary drying temperature is 150 ℃.
The absorbent papers prepared in examples 2 to 4 and comparative examples 1 to 2 were subjected to performance test, and the results thereof are shown in Table 1.
Table 1 results of performance test of absorbent paper in different slurry ratios
Softwood pulp: fluff pulp Penetration time(s) Infiltration (g)
Comparative example 1 100% softwood pulp 30.50 2.78
Comparative example 2 7:3 12.50 4.44
Example 2 3:2 8.97 5.00
Example 3 1:1 8.45 5.00
Example 4 3:7 7.84 5.00
As can be seen from table 1, in a certain ratio range of softwood pulp and fluff pulp, as the fluff pulp ratio increases, the penetration time of moisture decreases and the penetration amount increases, which is attributed to the fact that the introduction of fluff pulp can enhance the capillary action of the surface of absorbent paper, thereby facilitating the absorption and diffusion of liquid; but when the ratio of the fluff pulp is more than or equal to 40 percent (i.e. the softwood pulp: the fluff pulp is more than 3:2), the penetration performance gain of the fluff pulp to the absorbent paper is further improved, and the cost is increased more. Therefore, when the mass ratio of the softwood pulp to the fluff pulp in the preferable formula is 3:7-3:2, the permeability and the cost of the absorbent paper can be simultaneously achieved.
The absorbent papers prepared in examples 1, 2 and 5 and comparative example 3 were subjected to performance test, and the results thereof are recorded in table 2.
TABLE 2 results of Performance test of absorbent paper with different applied Polymer absorbent resin
Application amount (g/m) 2 ) Penetration time(s) Absorption rate
Example 1 30 7.64 37.00
Example 2 20 9.14 32.00
Example 5 25 8.15 34.00
Comparative example 3 40 7.91 44.00
As can be seen from table 2, in a certain range of the applied amount of the polymer water absorbent resin, the absorption capacity increased with the increase of the applied amount, but the penetration time tended to decrease and increase with the increase of the applied amount. Therefore, it is preferable that the application amount of the high molecular water absorbent resin is 20 to 30g/m 2 The water absorbing paper can be ensured to have excellent permeability.
The absorbent papers prepared in examples 1, 6 and 7 and comparative example 4 were subjected to performance test, and the results thereof are recorded in table 3.
TABLE 3 results of Performance test of absorbent papers at different secondary drying temperatures
Temperature (. Degree. C.) Moisture content Breaking force (N)
Example 1 130 7.81 5.21
Example 6 120 10.78 5.50
Example 7 140 7.04 4.16
Comparative example 4 150 6.85 3.94
As shown in table 3, as the temperature increases, the moisture gradually decreases, and the breaking force also gradually decreases. However, the breaking force is too low, so that the absorbent paper is easy to break in the application process. Therefore, the secondary drying temperature is controlled to be 120-140 ℃, the moisture of the absorbent paper can be ensured, and the breaking force meets the application requirement.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims (8)

1. A preparation method of the absorbent paper comprises the following steps:
s1, pulping softwood pulp and fluff pulp respectively, and then preparing pulp to obtain paper pulp;
s2, removing water from the paper pulp prepared in the step S1 through a felt part, and drying to prepare dry paper;
s3, uniformly broadcasting the macromolecule water-absorbent resin on the surface of the dry paper prepared in the step S2 to prepare the bottom paper;
s4, removing water from the paper pulp prepared in the step S1 through a felt part to obtain surface paper pulp, pressing the surface paper pulp with the bottom paper prepared in the step S3, and sequentially drying, wrinkling and drying for the second time to obtain the absorbent paper.
2. The method for producing absorbent paper according to claim 1, further comprising the step of:
s5, coiling, slitting and packaging the absorbent paper prepared in the step S4 in sequence.
3. The method of producing absorbent paper according to claim 1, wherein in step S1, the softwood pulp and the fluff pulp are mixed in a mass ratio of 3:7 to 3:2 in the pulp preparing process.
4. The method for producing absorbent paper according to claim 1, wherein in step S1, the concentration of the crushed pulp is 3 to 7wt%, and the time for crushing pulp is 15 to 30min; and an auxiliary agent is added in the pulp mixing process, wherein the auxiliary agent comprises a softening agent and a bulking agent, and the dosage of the auxiliary agent accounts for 0.4-0.6% of the total mass of the mixed pulp.
5. The method of producing absorbent paper according to claim 1, wherein in step S2, the temperature of the drying is 120 to 150 ℃; the moisture content of the dry paper is 5-10%.
6. The method for producing a water-absorbent paper according to claim 1, wherein in step S3, the amount of the polymer water-absorbent resin applied is 20 to 30g/m 2 。
7. The method of producing absorbent paper according to claim 1, wherein in step S4, the press pressure of the press is 0.3 to 0.5Mpa; the drying temperature of the primary drying is 110-135 ℃; the wrinkling rate in the wrinkling process is 6-10 degrees; the drying temperature of the secondary drying is 120-140 ℃; the water content of the absorbent paper is 5-12%.
8. A water absorbing paper made by the method of any one of claims 1-7.
CN202311805815.2A 2023-12-26 2023-12-26 Water-absorbing paper and preparation method thereof Pending CN117569119A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311805815.2A CN117569119A (en) 2023-12-26 2023-12-26 Water-absorbing paper and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311805815.2A CN117569119A (en) 2023-12-26 2023-12-26 Water-absorbing paper and preparation method thereof

Publications (1)

Publication Number Publication Date
CN117569119A true CN117569119A (en) 2024-02-20

Family

ID=89890167

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311805815.2A Pending CN117569119A (en) 2023-12-26 2023-12-26 Water-absorbing paper and preparation method thereof

Country Status (1)

Country Link
CN (1) CN117569119A (en)

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