Toilet paper and preparation method thereof

Abstract

The present invention discloses toilet paper and a preparation method thereof. The fiber suspension contains nanocellulose, wherein the absolute dry weight of the nanocellulose in the fiber suspension is 0.5-2%, the absolute dry weight of the long fibers is 0-15%, and the absolute dry weight of the short fibers is 99.5-83%. The toilet paper has a basis weight of 13.0-20.0 g / m2, a longitudinal-transverse strength ratio of 1.4-2.2, a longitudinal strength of 200-500 gf / inch, and a transverse strength of 100-250 gf / inch. By utilizing the speed difference between the jet-forming web and the sizing, some fibers are mainly arranged longitudinally, while other fibers are distributed between the longitudinal fiber chains to form a fiber web. They are also linked together by nanocellulose, which keeps the longitudinal strength of the paper unchanged, reduces the use of long fibers or dry strength agents or the pulping power, and reduces the cost of paper production; the transverse short fibers are combined with nanofibers and distributed between the short fiber chains, which improves the transverse strength, reduces the aspect ratio, and avoids the occurrence of tailing when torn; the combination of nanocellulose and long and short fibers improves the flexibility of the paper and the user experience.

Description

Technical Field

[0001] The present invention relates to a papermaking process, in particular to toilet paper and a preparation method thereof. Background Art

[0002] Household paper is used in a variety of scenarios, including at home and for consumers to carry around. To provide convenience and service, more and more public places, such as restaurants, hotels, shopping malls, and airports, are providing toilet paper for easy access. To meet these needs, the appearance of household paper varies significantly. For example, household toilet paper comes in a variety of formats, including cored rolls, coreless rolls, flat sheets, and pull-outs. A single roll or package typically weighs less than 200 grams, with a typical ply count of 2 to 4. Public places like hotels and airports generally use cored rolls, weighing over 500 grams per roll and typically having 1 to 3 plies. To use, staff insert the roll into a toilet paper box for consumers to remove. For cost reasons, most public places provide free single-ply toilet paper, and these products lack a break line. Users pull the paper down to the desired length by the end, then tear the paper apart before use. When the paper is torn, due to the low lateral strength of the paper, a long strip of "tail" will remain on the paper roll (referred to as "tail"), which will increase paper scraps, affect the neatness, and affect the consumer experience.

[0003] This is mainly because the fibers used to produce toilet paper are composed of glucose monomers. The exposed hydroxyl groups on the fibers form hydrogen bonds with the hydroxyl groups on other nearby fibers, thus providing the paper with physical properties such as strength, tear resistance, and burst resistance. At the same time, there is also a certain frictional adhesion between the fibers. During the production process, the fiber mixture is sprayed onto the forming wire through the head box sizing and rapidly dehydrated to form a wet paper web. Due to the speed difference between the forming wire and the sizing, most of the fibers are mainly arranged longitudinally along the running direction of the forming wire. This makes the longitudinal strength of the base paper much higher than the transverse strength. The longitudinal and transverse strength ratio of conventional toilet paper making processes ranges from 1.8 to 2.2. To avoid "tailing", the transverse strength of paper needs to be improved. The commonly used solutions in the industry are: increasing the amount of long fibers. Compared with short fibers, long fibers can provide more hydroxyl groups and form more hydrogen bonds with other fibers, thereby providing higher strength to the paper; increasing the amount of dry strength agent. The commonly used dry strength agent is polyacrylamide. Its molecular chains form a network cross-linking between fibers, enhancing the stability of the fiber network. This network cross-linking helps to improve the bonding strength of the paper; increasing the refining power. Refining uses physical friction to cause the fiber cell wall to produce fluffing, tearing, splitting, and brooming, releasing more hydroxyl groups, thereby increasing hydrogen bonding and improving paper strength. However, while these methods increase the transverse strength of the paper, they also increase the longitudinal strength of the paper, resulting in greater force required to tear the paper from the roll; the simultaneous increase in longitudinal and transverse strength also leads to a decrease in the softness of the paper, affecting the consumer experience; and they also increase production costs. Summary of the Invention

[0004] Purpose of the invention: The purpose of the present invention is to reduce the aspect strength ratio of paper while reducing production costs, and to provide a method for preparing toilet paper; another purpose of the present invention is to provide toilet paper prepared using the above-mentioned preparation method.

[0005] Technical solution: The method for preparing toilet paper of the present invention comprises the following steps:

[0006] (1) preparing long fiber slurry and short fiber slurry respectively, and mixing them to form a mixed slurry;

[0007] (2) the mixed slurry is further mixed and diluted to form a fiber suspension;

[0008] (3) The fiber suspension is sizing, forming, dehydrating, pressing, drying, wrinkling and winding to produce toilet paper; in step (1) or (2), nanocellulose is added to adjust the aspect ratio of the toilet paper, and in step (2), the content of nanocellulose in the fiber suspension is 0.5-2%, the content of long fibers is 0-15%, and the content of short fibers is 99.5-83%.

[0009] Furthermore, the carboxyl content of the nanocellulose is between 0.3 and 1.5 mmol / g, and the degree of polymerization (DP) is between 300 and 900. Nanocellulose has a larger specific surface area than long fibers or short fibers, and has abundant exposed hydroxyl groups on the surface. These hydroxyl groups can form a large number of hydrogen bonds with long fibers or short fibers, thereby increasing the binding force between the fibers and thus improving the strength of the paper. When the carboxyl content of nanocellulose is too high and the degree of polymerization is too low, the highly polar carboxyl groups affect the dispersion of the fibers, requiring the addition of more long fibers to increase the dispersion of the fibers within the slurry, and requiring a higher refining power to ensure uniformity in the paper's strength. When the carboxyl content of nanocellulose is too low and the degree of polymerization is too high, a small amount of nanocellulose cannot effectively bond with the long and short fibers, requiring the addition of more long fibers to maintain the fiber network structure of the slurry, and requiring a higher refining power to ensure uniformity in the paper's strength.

[0010] Furthermore, the addition point of the nanocellulose is in the long fiber pulping tank or the short fiber pulping tank or the mixing tank or the front tank of the machine. The position of nanocellulose addition is different, and the mixing process is adjusted to ensure the uniformity of mixing, which has little impact on the performance of the paper. In order to facilitate production, it can be set at a reasonable addition point according to process requirements.

[0011] Furthermore, in the fiber suspension in step (2), the content of nanocellulose is 0.5-1.5%, the content of long fibers is 0-10%, and the content of short fibers is 99.5-89.5%.

[0012] Furthermore, in step (1), the mixing method of the long fiber pulp and the short fiber pulp includes: the long fiber line pulp board and the short fiber line pulp board are respectively soaked and dispersed to form long fiber pulp and short fiber pulp, and then mixed; the long fiber pulp board and part of the short fiber pulp board are put into the long fiber dispersing tank for soaking and dispersing to form long fiber line pulp, and then mixed with the short fiber pulp formed by soaking and dispersing the remaining short fiber pulp board separately; the long fiber pulp board and the short fiber pulp board are put into the long fiber dispersing tank for soaking and dispersing to form a mixed pulp; the long fiber pulp board and the short fiber pulp board are put into the short fiber dispersing tank for soaking and dispersing to form a mixed pulp. Since the amount of long fiber used is small, the pulping power is reduced and the mixing method with the short fiber is less restricted, which simplifies the process requirements and reduces the production cost of paper.

[0013] Furthermore, in step (2), the refining power of the mixed pulp is 5 to 35 kwh / t. A relatively large amount of long fibers results in a relatively large refining power. Such a large refining power causes excessive fiber fibrillation, resulting in excessive strength and poor softness, which reduces the softness of the paper and the user experience. Therefore, reducing the amount of long fibers used can not only save manufacturing costs, but also reduce the refining power, thereby improving the softness of the paper and the user experience.

[0014] Furthermore, the slurry concentration of the mixed slurry in step (2) is 2.5% to 4.5%. A suitable slurry concentration can ensure paper quality, improve production efficiency and reduce manufacturing costs.

[0015] Furthermore, the fiber concentration of the fiber suspension in step (2) is 0.1% to 0.35% to ensure the basis weight, quality and economic benefits of the paper.

[0016] The present invention also provides toilet paper produced using the above toilet paper preparation method, wherein the basis weight of the toilet paper is 13.0 g / m2 to 20.0 g / m2 and the longitudinal and transverse strength ratio is 1.4 to 2.2.

[0017] Furthermore, the ratio of longitudinal to transverse strength of the toilet paper is between 1.6 and 2.0, the longitudinal strength of the toilet paper is between 200 and 500 gf / 25 mm, and the transverse strength of the toilet paper is between 100 and 250 gf / 25 mm.

[0018] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: 1. By utilizing the speed difference between the injection molding network and the sizing, some fibers are mainly arranged longitudinally, and the other part of the fibers are distributed between the longitudinal fiber chains to form a fiber network. They are also linked together by nanocellulose, maintaining the longitudinal strength of the paper without significant changes, reducing the use of long fibers or dry strength agents or pulping power, and reducing the cost of paper production; 2. The transverse fibers are combined with nanofibers and distributed between the fiber chains, reducing the aspect ratio without affecting the longitudinal strength of the paper, and avoiding the occurrence of tailing when torn; 3. Nanocellulose is combined with fibers in the longitudinal and transverse directions, which increases the strength of the paper while improving the flexibility of the paper, thereby improving the user experience; 4. The toilet paper prepared by this method has a basis weight of 13.0g / ㎡~20.0g / ㎡, a longitudinal and transverse strength ratio of 1.4~2.2, a longitudinal strength of 200~500gf / 25mm, and a transverse strength of 100~250gf / 25mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0021] like Figure 1 A method for preparing toilet paper is shown, comprising the following steps:

[0022] (1) preparing long fiber slurry and short fiber slurry respectively, and mixing them to form a mixed slurry;

[0023] (2) the mixed slurry is further mixed and diluted to form a fiber suspension;

[0024] (3) The fiber suspension is sizing, forming, dehydrating, pressing, drying, wrinkling and winding to produce toilet paper.

[0025] During the preparation of toilet paper, the addition ratio of the long fiber pulp, the short fiber pulp and the nanocellulose and the mixing method thereof are detailed in Examples 1 to 5 and Comparative Examples 1 to 2.

[0026] Example 1

[0027] (1) 150 parts of long fiber pulp and 850 parts of short fiber pulp are sent to the long fiber dispersing machine, and after being soaked and dispersed, they are stored in the long fiber unloading tower, and then transferred to the long fiber knocking tower to form long fiber line pulp;

[0028] Another 989 parts of short fiber pulp and 11 parts of nanocellulose fibers were fed into the short fiber dispersing machine, and after being soaked and dispersed, they were stored in the short fiber unloading tower. After being processed by the deflaker, they were stored in the short fiber knocking tower to form short fiber line pulp.

[0029] (2) 10% of the pulp from the long fiber tapping tower and 90% of the pulp from the short fiber tapping tower are mixed into a mixing tank to form a mixed pulp, and the mixed pulp is refined at a refining power of 10 kwh / t;

[0030] The mixed slurry enters the front tank of the machine for further mixing, and the slurry concentration of the mixed slurry is 3.12%;

[0031] The mixed pulp in the front tank of the machine is further diluted by the dilution tower and then enters the head box to form a fiber suspension with a concentration of 0.21%;

[0032] (3) The fiber suspension is sequentially sizing, forming, dehydrating, pressing, drying, wrinkling and winding to produce toilet paper base paper.

[0033] The carboxyl content of the nanocellulose fibers is 0.73 mmol / g, and the average degree of polymerization DP is 471; the absolute dry content of the nanocellulose fibers is 1%, the absolute dry content of the long fibers is 1.5%, and the absolute dry content of the short fibers is 97.5%.

[0034] Example 2

[0035] (1) 980 parts of short fiber pulp are sent to the short fiber dispersing machine, and after being soaked and dispersed, they are stored in the short fiber unloading tower. After being processed by the deflaking machine, they are stored in the short fiber knocking tower to form short fiber line pulp;

[0036] (2) The pulp from the short fiber knocking tower enters the mixing tank, and 20 parts of nanocellulose fibers are added to form a mixed pulp. The refining power is 5 kwh / t;

[0037] The mixed slurry enters the front tank of the machine for further mixing, and the slurry concentration of the mixed slurry is 3.09%;

[0038] The mixed pulp in the front tank of the machine is further diluted by the dilution tower and then enters the head box to form a fiber suspension with a concentration of 0.23%;

[0039] (3) The fiber suspension is sequentially sizing, forming, dehydrating, pressing, drying, wrinkling and winding to produce toilet paper base paper.

[0040] The carboxyl content of the nanocellulose fibers is 0.73 mmol / g, and the average degree of polymerization DP is 471; the absolute dry weight content of the nanocellulose fibers is 2%, and the absolute dry weight content of the short fibers is 98%.

[0041] Example 3

[0042] (1) 750 parts of long fiber pulp and 250 parts of short fiber pulp are sent to the long fiber dispersing machine, and after being soaked and dispersed, they are stored in the long fiber unloading tower, and then transferred to the long fiber knocking tower to form long fiber line pulp;

[0043] Another 994 parts of short fiber pulp and 6 parts of nanocellulose fibers are fed into the short fiber dispersing machine, and after being soaked and dispersed, they are stored in the short fiber unloading tower. After being processed by the deflaker, they are stored in the short fiber knocking tower to form short fiber line pulp.

[0044] (2) 20% of the pulp from the long fiber tapping tower and 80% of the pulp from the short fiber tapping tower are mixed into a mixing tank to form a mixed pulp, and the mixed pulp is refined at a refining power of 15 kwh / t;

[0045] The mixed slurry enters the front tank of the machine for further mixing, and the slurry concentration of the mixed slurry is 2.99%;

[0046] The mixed pulp in the front tank of the machine is further diluted by the dilution tower and then enters the headbox to form a fiber suspension with a concentration of 0.20%;

[0047] (3) The fiber suspension is sequentially sizing, forming, dehydrating, pressing, drying, wrinkling and winding to produce toilet paper base paper.

[0048] The carboxyl content of the nanocellulose fibers is 0.59 mmol / g, the average degree of polymerization DP is 436, the absolute dry content of the nanocellulose fibers is 0.5%, the absolute dry content of the long fibers is 15%, and the absolute dry content of the short fibers is 84.5%.

[0049] Example 4

[0050] (1) 750 parts of long fiber pulp and 250 parts of short fiber pulp are sent to the long fiber dispersing machine, and after being soaked and dispersed, they are stored in the long fiber unloading tower, and then transferred to the long fiber knocking tower to form long fiber line pulp;

[0051] Another 1000 portions of short fiber pulp are sent to the short fiber dispersing machine, and after being soaked and dispersed, they are stored in the short fiber unloading tower. After being processed by the deflaker, they are stored in the short fiber knocking tower to form short fiber line pulp.

[0052] (2) 20% of the pulp from the long fiber tapping tower and 79.5% of the pulp from the short fiber tapping tower are mixed into a mixing tank to form a mixed pulp, and the mixed pulp is refined at a refining power of 35 kwh / t;

[0053] The mixed pulp enters the front tank of the machine and is further mixed by adding 0.5% nanocellulose. The pulp concentration of the mixed pulp is 2.99%.

[0054] The mixed pulp in the front tank of the machine is further diluted by the dilution tower and then enters the head box to form a fiber suspension with a concentration of 0.19%;

[0055] (3) The fiber suspension is sequentially sizing, forming, dehydrating, pressing, drying, wrinkling and winding to produce toilet paper base paper.

[0056] The carboxyl content of the nanocellulose fibers is 0.59 mmol / g, and the average degree of polymerization DP is 436; the absolute dry content of the nanocellulose fibers is 0.5%, the absolute dry content of the long fibers is 15%, and the absolute dry content of the short fibers is 84.5%.

[0057] Example 5

[0058] (1) 400 parts of long fiber pulp and 600 parts of short fiber pulp are sent to the long fiber dispersing machine, and after being soaked and dispersed, they are stored in the long fiber unloading tower, and then transferred to the long fiber knocking tower to form long fiber line pulp. The pulping power is 10kwh / t;

[0059] Another 980 parts of short fiber pulp and 20 parts of nanocellulose fibers are fed into the short fiber dispersing machine, and after being soaked and dispersed, they are stored in the short fiber unloading tower. After being processed by the deflaker, they are stored in the short fiber knocking tower to form short fiber line pulp.

[0060] (2) 25% of the slurry from the long fiber tapping tower and 75% of the slurry from the short fiber tapping tower are mixed into a mixing tank to form a mixed slurry;

[0061] The mixed slurry enters the front tank of the machine for further mixing, and the slurry concentration of the mixed slurry is 3.16%;

[0062] The mixed pulp in the front tank of the machine is further diluted by the dilution tower and then enters the head box to form a fiber suspension with a concentration of 0.21%;

[0063] (3) The fiber suspension is sequentially sizing, forming, dehydrating, pressing, drying, wrinkling and winding to produce toilet paper base paper.

[0064] The carboxyl content of the nanocellulose fibers is 1.28 mmol / g, and the average degree of polymerization DP is 780; the absolute dry matter content of the nanocellulose fibers is 1.5%, the absolute dry matter content of the long fibers is 10%, and the absolute dry matter content of the short fibers is 88.5%.

[0065] Comparative Example 1

[0066] Different from Examples 1 to 5, no nanocellulose was added in Comparative Example 1.

[0067] (1) 1000 pieces of long fiber pulp are sent to the long fiber dispersing machine, and after being soaked and dispersed, they are stored in the long fiber unloading tower, and then transferred to the long fiber knocking tower to form long fiber line pulp. The pulping power is 20kwh / t;

[0068] Another 1,000 pieces of short fiber pulp are sent to the short fiber dispersing machine, and after being soaked and dispersed, they are stored in the short fiber unloading tower. After being processed by the deflaker, they are stored in the short fiber knocking tower to form short fiber line pulp.

[0069] (2) 17% of the pulp from the long fiber knocking tower and 83% of the pulp from the short fiber knocking tower are mixed into a mixing tank to form a mixed pulp, and the mixed pulp is refined at a refining power of 20 kwh / t;

[0070] The mixed slurry enters the front tank of the machine for further mixing, and the slurry concentration of the mixed slurry is 3.15%;

[0071] The mixed pulp in the front tank of the machine is further diluted by the dilution tower and then enters the head box to form a fiber suspension with a concentration of 0.22%;

[0072] (3) The fiber suspension is sequentially sizing, forming, dehydrating, pressing, drying, wrinkling and winding to produce toilet paper base paper.

[0073] The dry content of the long fiber is 17%, and the dry content of the short fiber is 83%.

[0074] Comparative Example 2

[0075] Different from Comparative Example 1, only short fiber pulp was used to make the mixed pulp.

[0076] (1) 1000 parts of staple fiber pulp are sent to a staple fiber dispersing machine, and after being soaked and dispersed, they are stored in a staple fiber unloading tower. After being processed by a deflaker, they are stored in a staple fiber knocking tower to form a staple fiber line pulp;

[0077] (2) 100% of the pulp from the short fiber knocking tower is taken into the mixing tank for mixing to form a mixed pulp and the mixed pulp is refined at a refining power of 5 kwh / t;

[0078] The mixed slurry enters the front tank of the machine for further mixing, and the slurry concentration of the mixed slurry is 3.13%;

[0079] The mixed pulp in the front tank of the machine is further diluted by the dilution tower and then enters the head box to form a fiber suspension with a concentration of 0.2%;

[0080] (3) The fiber suspension is sequentially sizing, forming, dehydrating, pressing, drying, wrinkling and winding to produce toilet paper base paper.

[0081] The dry content of staple fibers is 100%.

[0082] The basis weight, longitudinal strength, transverse strength and aspect strength ratio of the toilet paper base papers prepared in Examples 1 to 5 and Comparative Examples 1 to 2 were tested, as shown in Table 1.

[0083] Table 1 Test results of toilet paper properties prepared under different conditions

[0084]

[0085] Comparative Examples 1 to 5, the carboxyl content and degree of polymerization of nanocellulose are too high or too low, and the aspect ratio is relatively large: when the carboxyl content of nanocellulose is too high and the degree of polymerization is too high, the highly polar carboxyl groups make its dispersion performance poor, and more long fibers need to be added to increase the dispersion of the internal fibers of the slurry, and a higher refining power is required to ensure the uniformity of the paper strength, which cannot effectively improve the aspect ratio of the paper and cannot reduce the production cost; when the carboxyl content of nanocellulose is too low and the degree of polymerization is low, a small amount of nanocellulose cannot effectively bond with the long fibers and short fibers, and more long fibers still need to be added to maintain the network structure of the fibers of the slurry, and a higher refining power is required to ensure the uniformity of the paper strength, which cannot effectively improve the aspect ratio of the paper and cannot reduce the production cost. When the carboxyl content of nanocellulose is 0.73 and the degree of polymerization is 471, adding a small amount of nanocellulose can significantly reduce the amount of long fibers used. At this time, the difference between the longitudinal strength and the transverse strength of the paper becomes smaller, and the aspect ratio is between 1.4 and 1.6. The reduction in the aspect ratio effectively avoids the "tailing" problem when tearing, and greatly reduces the cost of paper production.

[0086] Comparing Examples 1-2 with Comparative Examples 1-2, while significantly reducing the amount of long fibers, Examples 1-2 still meet paper quality requirements for basis weight, longitudinal strength, and transverse strength. Compared to Comparative Examples 1-2, significantly reducing the amount of long fibers significantly reduces both longitudinal and transverse strength, resulting in a decrease in toilet paper strength. Meanwhile, the aspect-to-transverse strength ratio remains at 2.1-2.2, failing to effectively address the "tailing" problem caused by paper tearing. However, in Examples 1-2, the short fiber content is kept relatively high, the long fiber content is gradually reduced, and the amount of nanocellulose is increased. The refining power decreases, the longitudinal strength of the paper decreases slightly by 3%, the transverse strength increases by 9%, and the aspect-to-transverse strength ratio decreases by 12.5%. Nanocellulose has a larger surface area than long or short fibers. The abundant exposed carboxyl groups on its surface form numerous hydrogen bonds with the long or short fibers, increasing their bonding strength and boosting paper strength. However, this bonding strength is less than the breaking strength of the long fibers, making it easier to tear the paper. In Examples 1 and 2, the amount of long fibers used is significantly reduced. Due to the presence of nanocellulose, there is a speed difference between the fiber mixed slurry spray forming network and the sizing process. Some short fibers are regularly arranged in the longitudinal direction. The short fibers are linked together in the longitudinal direction by nanocellulose. Another part of the short fibers is distributed between the short fiber chains in the longitudinal direction to form a fiber web. By utilizing the speed difference, the short fibers can be arranged more regularly than the long fibers. At the same time, the strength of the short fiber chains in the longitudinal direction is slightly lower than that of the long fibers, and the linked short fibers are more flexible. This reduces the force required to tear the paper without affecting the longitudinal strength of the paper, while improving the flexibility of the paper product. The short fibers in the transverse direction are combined with nanofibers and distributed between the short fiber chains. While ensuring the flexibility of the paper, the transverse strength is improved, and the ratio of longitudinal and transverse strength is reduced, further avoiding the "tailing" problem caused by paper tearing. In addition, the smaller refining power avoids the excessive fiber splitting, which causes the paper surface to be rough and the softness to deteriorate, further improving the softness of the paper and enhancing the user experience.

Claims

1. A method for preparing toilet paper, comprising the following steps: (1) preparing long fiber slurry and short fiber slurry separately, and mixing them to form a mixed slurry; (2) The mixed pulp is further refined and diluted to form a fiber suspension; (3) The fiber suspension is sizing, forming, dehydrating, pressing, drying, wrinkling and winding to produce toilet paper; It is characterized by: In step (1) or (2), nanocellulose is added to adjust the aspect ratio of toilet paper. In step (2), the content of nanocellulose in the fiber suspension is 0.5-2%, the content of long fibers is 0-15%, and the content of short fibers is 99.5-83%. The carboxyl content of the nanocellulose is 0.73-1.5 mmol / g. The degree of polymerization (DP) of the nanocellulose is between 300 and 471.

2. The method for preparing toilet paper according to claim 1, wherein The nanocellulose is added at a long fiber pulping tank, a short fiber pulping tank, a mixing tank, or a machine front tank.

3. The method for preparing toilet paper according to claim 2, wherein: In the step (2), the content of nanocellulose in the fiber suspension is 0.5-1.5%, the content of long fibers is 0-10%, and the content of short fibers is 99.5-89.5%.

4. The method for preparing toilet paper according to claim 1, wherein The mixing method of the long fiber pulp and the short fiber pulp in the step (1) includes: the long fiber pulp board and the short fiber pulp board are respectively infiltrated and dispersed to form long fiber pulp and short fiber pulp, and then mixed; or the long fiber pulp board and part of the short fiber pulp board are put into the long fiber dispersing tank for infiltration and dispersion to form long fiber pulp, and then mixed with the short fiber pulp formed by infiltrating and dispersing the remaining short fiber pulp board separately.

5. The method for preparing toilet paper according to claim 1, wherein: The refining power of the mixed slurry in step (2) is 5-35 kwh / t.

6. The method for preparing toilet paper according to claim 1, wherein: The slurry concentration of the mixed slurry in step (2) is 2.5% to 4.5%.

7. The method for preparing toilet paper according to claim 1, wherein: The fiber concentration of the fiber suspension in step (2) is 0.1% to 0.35%.

8. Toilet paper produced using the method for preparing toilet paper according to any one of claims 1 to 7.

Images