A wiping paper and a method for producing the same

Abstract

The application discloses a wiping paper and a preparation method thereof, and relates to the technical field of household paper, and aims at solving the problem of high cost of the wiping paper. The preparation method comprises the following steps: mixing sulfate wet pulp and bleached coniferous wood pulp according to the mass fraction ratio of 3-3.5:2-2.5 to obtain papermaking pulp; adding dry strength agent, wet strength agent and process additive into the papermaking pulp to obtain pretreated pulp; and copying the pretreated pulp into the wiping paper, wherein the mass fraction ratio of the dry strength agent, the wet strength agent and the process additive is 8-10:7-8:0.32-0.42. The wiping paper and the preparation method thereof are used for preparing the wiping paper.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of living paper, and particularly relates to a wiping paper and a preparation method thereof. BACKGROUND

[0002] With the enhancement of health and hygiene awareness, consumers' demand for high-end wiping paper is increasing. The wiping paper commonly used in daily life includes dry non-woven wet wiping paper and composite wiping paper with a latex reticular structure interlayer. However, the production cost of the wiping paper is high, and thus the wiping paper has a high pricing, which is not conducive to the consumption capacity of consumers. Therefore, it is important to produce a wiping paper with low cost and good tensile performance under dry and wet conditions. SUMMARY

[0003] The present application aims to provide a wiping paper and a preparation method thereof, so as to produce a wiping paper with low cost and good tensile performance under dry and wet conditions.

[0004] In a first aspect, in order to achieve the above-mentioned purpose, the present application provides a preparation method of a wiping paper, the wiping paper has a basis weight of 20 g / m 2 ~ 45 g / m 2 , the wiping paper has a longitudinal tensile index of 31.0 Nm / g ~ 38.0 Nm / g, the wiping paper has a transverse tensile index of 18.0 Nm / g ~ 25.0 Nm / g, the wiping paper has a longitudinal wet tensile strength of 340 N / m ~ 450 N / m, and the preparation method of the wiping paper comprises the following steps.

[0005] According to a mass fraction ratio of 3 ~ 3.5: 2 ~ 2.5 of a sulfate wet pulp and a bleached coniferous wood pulp, the sulfate wet pulp and the bleached coniferous wood pulp are mixed to obtain papermaking pulp;

[0006] A dry strength agent, a wet strength agent and a process aid are added to the papermaking pulp to obtain pretreated pulp;

[0007] The pretreated pulp is formed into the wiping paper, and a mass fraction ratio of the dry strength agent, the wet strength agent and the process aid is 8 ~ 10: 7 ~ 8: 0.32 ~ 0.42.

[0008] Compared with the prior art, the preparation method of the wiping paper provided by the present application first mixes the sulfate wet pulp and the bleached coniferous wood pulp according to the mass fraction ratio of (3-3.5):(2-2.5) to obtain papermaking pulp. In the sulfate wet pulp provided by the present application, the retention degree of cellulose and hemicellulose is relatively high, so that the strength of the pulp is relatively high, the fiber degradation rate is relatively low, and it is beneficial to prepare the wiping paper with relatively optimal tensile performance. In addition, the bleached coniferous wood pulp provided by the present application not only has a wide source, but also has a relatively long fiber length and a relatively high degree of fibrillation, and the skeleton structure formed by the bleached coniferous wood pulp has relatively high strength, which is beneficial to prepare the wiping paper with relatively optimal tensile performance. Based on this, the present application limits the mass fraction ratio of the sulfate wet pulp and the bleached coniferous wood pulp to (3-3.5):(2-2.5), and under this ratio, the economy and the tensile performance of the papermaking pulp obtained by mixing coexist, which is beneficial to prepare the wiping paper with relatively optimal tensile performance at a relatively low cost. Moreover, the papermaking pulp for producing the wiping paper is all virgin pulp, which has high quality and is relatively environmentally friendly.

[0009] Then, the present application adds dry strength agent, wet strength agent and process aid to the papermaking pulp to obtain pretreated pulp. The surface of the cellulose molecules of the papermaking pulp has relatively many hydroxyl groups, and the dry strength agent has relatively many cationic groups capable of forming hydrogen bonds with the hydroxyl groups. Therefore, the present application limits the mass fraction ratio of the dry strength agent, the wet strength agent and the process aid to (8-10):(7-8):(0.32-0.42). Specifically, after the dry strength agent with the above-mentioned ratio is added to the papermaking pulp, the dry strength agent can perform "chemical hydration" with the cellulose molecules, promote the hydrogen bond forming groups contained in the strengthening agent to form hydrogen bond combination between the cellulose molecules of the papermaking pulp, and enhance the binding force between the fibers. In this process, the dry strength agent can form a network structure in the papermaking pulp to limit the movement of the fibers, which is beneficial to prepare the wiping paper with relatively optimal tensile performance under dry conditions. When the wet strength agent with the above-mentioned ratio is added to the papermaking pulp, the wet strength agent can form chemical bonds with the fibers of the papermaking pulp and strengthen the hydrogen bonds existing in the wet strength agent, so that the hydrogen bonds will not be broken due to the soaking of the wiping paper in liquid and can still maintain a certain strength, which is beneficial to prepare the wiping paper with relatively optimal tensile performance under wet conditions. In addition, the present application also adds the process aid with the above-mentioned ratio to the papermaking pulp to further improve the production rate of the wiping paper, thereby reducing the production cost and improving the economic benefit.

[0010] According to the experiment, under the joint action of the sulfate wet pulp and the bleached coniferous wood pulp with the mass fraction ratio of (3-3.5):(2-2.5) and the dry strength agent, the wet strength agent and the process aid with the mass fraction ratio of (8-10):(7-8):(0.32-0.42), the wiping paper prepared has a basis weight of 20g / m 2 ~45g / m 2The wiping paper has a longitudinal tensile index of 31.0 Nm / g to 38.0 Nm / g and a transverse tensile index of 18.0 Nm / g to 25.0 Nm / g, so that a wiping paper with low cost and good tensile performance under dry and wet conditions can be produced.

[0011] In a second aspect, the present application further provides a wiping paper comprising paper fibers, dry strength agent, wet strength agent and process aid, wherein the wiping paper has a basis weight of 20 g / m 2 to 45 g / m 2 , the wiping paper has a longitudinal tensile index of 31.0 Nm / g to 38.0 Nm / g, the wiping paper has a transverse tensile index of 18.0 Nm / g to 25.0 Nm / g, and the wiping paper has a longitudinal wet tensile strength of 340 Nm / g to 450 N / m.

[0012] The mass ratio of the dry strength agent, the wet strength agent and the process aid is (8-10):(7-8):(0.32-0.42).

[0013] Compared with the prior art, the wiping paper provided by the present application has the same beneficial effects as the method for preparing a wiping paper, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0014] The accompanying drawings, which are included to provide a further understanding of the present application, form a part of the present application and are included to further explain the present application and its preferred embodiments and no limitation of the present application is intended by the inclusion of the drawings in the present application. In the drawings:

[0015] Figure 1 A flow chart of the method for preparing the wiping paper provided in the present embodiment is shown. DETAILED DESCRIPTION

[0016] In order to make the technical problems to be solved by the present application, the technical solutions and the beneficial effects more clearly understood, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0017] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited. The meaning of "several" is one or more, unless otherwise explicitly and specifically limited.

[0018] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0019] It should be noted that in the present application, the words "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described as "exemplary" or "for example" in the present disclosure should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of "exemplary" or "for example" is intended to present concepts in a concrete manner.

[0020] In the present application, "at least one" means one or more, and "multiple" means two or more. The association relationship of the associated objects is described, which means that there can be three relationships, for example, A and / or B, which can represent the following cases: A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after it. "At least one of the following" or similar expressions means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b or c can represent: a, b, c, a and b, a and c, b and c, or a, b and c, where a, b and c can be single or multiple.

[0021] With the increasing awareness of health and hygiene, consumers have increasingly high demand for high-end wiping paper. The wiping paper commonly used in daily life includes dry wiping paper of dry non-woven fabric and composite wiping paper with a latex reticular structure interlayer, however, the production cost of the wiping paper is high, and therefore the wiping paper has a high pricing, which has an adverse effect on the consumer's consumption capacity. Therefore, it is important to produce a wiping paper with low cost and good tensile performance under dry and wet conditions.

[0022] In view of the above problems, the present application provides a preparation method of wiping paper, which produces a wiping paper with low cost and good tensile performance under dry and wet conditions. Figure 1 A flow chart of the preparation method of the wiping paper provided in the present embodiment is shown. As shown in Figure 1 The preparation method of the wiping paper includes:

[0023] Step 101: according to the mass ratio of the sulfite wet pulp and the bleached softwood pulp (3-3.5):(2-2.5), the sulfite wet pulp and the bleached softwood pulp are mixed to obtain papermaking pulp.

[0024] For example, in order to prepare the sulfite wet pulp, a pre-soaking tower can be used to soak the raw wood chips in the sulfating solution at an impregnation temperature of 95-105℃ to obtain impregnated wood chips. In this process, the sulfating solution penetrates into the capillary structure of the wood chips and starts a low-temperature chemical reaction with the wood. Good impregnation is important for obtaining uniform cooking effect and low waste rate. Then, the impregnated wood chips are cooked in the sulfating solution by using a digester at 140-150℃ to obtain the sulfite wet pulp. In this process, the α-ether bond on the phenolic structure unit of lignin is broken, which in turn initiates the breaking of β-O-4 (β-aryl ether). Since the β-O-4 linkage accounts for a considerable proportion in the lignin structure, it can continuously degrade the lignin macromolecules into low molecules. It should be understood that the type of wood chips used in the embodiments of the present application can be adjusted according to actual conditions, as long as the sulfite wet pulp with good strength can be prepared, which is not limited herein.

[0025] For example, the sulfite wet pulp and the bleached softwood pulp are used as the papermaking pulp in the embodiments of the present application. In the sulfite wet pulp provided by the present application, the retention degree of cellulose and hemicellulose is high, so that the strength of the pulp is high, the fiber degradation rate is low, and it is beneficial to prepare the wiping paper with good tensile properties. In addition, the bleached softwood pulp provided by the present application not only has a wide source, but also has a long fiber length and a high degree of fibrillation, and the skeleton structure formed thereby has high strength, which is beneficial to prepare the wiping paper with good tensile properties. Based on this, the present application limits the mass ratio of the sulfite wet pulp and the bleached softwood pulp to (3-3.5):(2-2.5). Under this ratio, the economic efficiency and the tensile properties of the mixed papermaking pulp coexist, which is beneficial to prepare the wiping paper with good tensile properties at a low cost.

[0026] Then, the above sulfite wet pulp and bleached softwood pulp are mixed and refined by a conical refiner to obtain the papermaking pulp. The beating concentration of the papermaking pulp is 3.0%-4.0%, and the beating degree of the papermaking pulp is 41°SR-45°SR. In the beating process, the fibers are subjected to different degrees of water absorption and swelling, and the fine fibers are formed, so that more hydroxyl groups are exposed on the surface of the fibers, which is beneficial to the formation of hydrogen bonds in the forming process of the wiping paper, thereby improving the bonding force between the fibers and making the structure of the wiping paper more compact. The present application changes the morphology of the fibers by refining, so that the paper pulp obtains mechanical strength and some physical properties to ensure that the paper obtained by papermaking can meet the expected quality requirements.

[0027] Exemplarily, before mixing the kraft pulp with the bleached softwood pulp, the kraft pulp should be firstly transported to a wet pulp tank for disintegration, then be de-resined by a de-resiner, and then be milled by a short fiber conical refiner. The beating consistency of the kraft pulp is 4.0%-5.0%, and the beating degree of the kraft pulp is 23°SR-27°SR. In addition, the bleached softwood pulp should also be transported to a hydraulic pulper for disintegration, then be de-resined by a de-resiner, and then be milled by a long fiber conical refiner. The beating consistency of the bleached softwood pulp is 4.0%-5.0%, and the beating degree of the bleached softwood pulp is 30°SR-34°SR. Within the above ranges, the bonding force between the kraft pulp fibers and the bonding force between the bleached softwood pulp fibers increase with the increase of the beating degree, thereby being beneficial to preparing the wiping paper with better tensile properties.

[0028] It is worth mentioning that the imported Andritz disc refiner is used in the present application, the pulp enters the disc refiner from the inlet, and then enters the grinding teeth on the inner and outer grinding areas through the center hole of the moving disc. The shearing force between the fibers and the grinding teeth and between the fibers is used to cut the fibers and make the fibers fine. The spline shaft technology is used to run stably and efficiently.

[0029] Step 102: adding dry strength agent, wet strength agent and process aid into the papermaking pulp to obtain a pretreated pulp.

[0030] Exemplarily, the concentration of the papermaking pulp is adjusted to 3.0%-3.6% by using white water, then the dry strength agent, the wet strength agent and the process aid are added into the papermaking pulp to obtain a pretreated pulp. Finally, the pretreated pulp is sent to a wire flow box (i.e. a hydraulic flow box), and then to a wire section, and the pulp concentration on the wire is 0.3-0.55% and the pulp / wire speed ratio is (0.950-0.970):1.

[0031] It is worth mentioning that the equipment used in the present application is a long net paper machine. Since the forming section uses an endless net forming, the thickness and texture of the paper can be more uniform, and the consistency is good. It should be understood that the white water used in the present application is the water removed during the formation of the paper web, and the water removed by the vacuum box and the press, which is collectively referred to as white water. The paper machine white water circulation system can treat the paper machine white water, so as to replace clean water for the production process, reduce the amount of clean water, and also reduce the amount of waste water discharge and fiber loss.

[0032] The dry strength agent provided by the embodiment of the present application comprises at least one of cationic starch, anionic starch, oxidized carboxymethyl starch and cationic polyacrylamide. The surface of cellulose molecules in the papermaking pulp has more hydroxyl groups, and the dry strength agent has more cationic groups capable of forming hydrogen bonds with the hydroxyl groups. Therefore, the mass ratio of the dry strength agent, the wet strength agent and the process aid is limited to (8-10):(7-8):(0.32-0.42) in the present application. Specifically, the dry strength agent in the above ratio is added to the papermaking pulp, and then the chemical hydration of the cellulose molecules is promoted, so that the hydrogen bond forming groups contained in the dry strength agent are combined with the cellulose molecules in the papermaking pulp through hydrogen bonds, and the binding force between the fibers is enhanced. In this process, the dry strength agent forms a network structure in the papermaking pulp, which limits the movement of the fibers, and is beneficial to the preparation of the wiping paper with excellent tensile properties under dry conditions. In addition, by adding the dry strength agent to the papermaking pulp, the inexpensive raw materials such as waste paper and mechanical pulp can be used to replace the high-quality coniferous wood pulp under the condition of maintaining the original strength of the paper, so as to reduce the production cost.

[0033] The wet strength agent provided by the embodiment of the present application comprises at least one of polyamide polyamine epichlorohydrin, urea-formaldehyde resin, melamine formaldehyde resin, polyacrylamide glyoxal, polyethyleneimine and dialdehyde starch. The wet strength agent in the above ratio is added to the papermaking pulp, so that the wet strength agent can form chemical bonds with the fibers in the papermaking pulp, and the hydrogen bonds in the wet strength agent are also enhanced. Therefore, the wiping paper can maintain a certain strength even if it is soaked in liquid, and is beneficial to the preparation of the wiping paper with excellent tensile properties under wet conditions.

[0034] Exemplarily, the process aid provided by the embodiment of the present application comprises resin control agent, bactericide and defoaming agent, and the mass fraction ratio of the resin control agent, the bactericide and the defoaming agent is limited to (0.15-0.2):(0.07-0.1):(0.1-0.12). By adding the process aid in the above ratio in the paper pulp, the productivity of the wiping paper is further improved, thereby reducing the production cost and improving the economic benefit. Specifically, the resin control agent provided by the embodiment of the present application is selected from at least one of sodium polyacrylate, methylene bis-naphthalene sulfonic acid sodium and polyoxyethylene alkylphenol ether. In the embodiment of the present application, by adding the resin control agent in the above ratio, the resin particles can be dispersed, and the adhesion is reduced, thereby avoiding the obstacles caused by agglomeration. The bactericide provided by the embodiment of the present application comprises isothiazolinone and its derivatives, organic bromine compounds, amine compounds and phenolic compounds. In the embodiment of the present application, by adding the bactericide in the above ratio, the harmful bacteria in the paper pulp are killed and removed, so that the prepared wiping paper does not affect the health of consumers. The defoaming agent provided by the embodiment of the present application comprises at least one of non-ionic silicone emulsion, dimethyl silicone oil and fumed silica. In the embodiment of the present application, by adding the defoaming agent in the above ratio, the foam formed in the papermaking process by various factors is inhibited and eliminated.

[0035] Step 103: the pretreated pulp is formed into wiping paper.

[0036] Exemplarily, the pretreated pulp is first dewatered and formed into wet paper sheet by the long net part, so that the fibers are uniformly "oriented" in the longitudinal and transverse directions, the number of fibers arranged in the transverse direction is close to the number of fibers arranged in the longitudinal direction, and the product has a good uniformity appearance. At this time, the dryness of the wet paper sheet is greater than or equal to 14%-16%.

[0037] Then, the wet paper sheet is subjected to multiple roll supports to obtain a dewatered paper sheet. The number of roll supports is twice, the first roll support is a vacuum roll support, and the second roll support is a blind hole roll support. When the wet paper sheet is subjected to the vacuum roll support, the dryness of the wet paper sheet is greater than or equal to 36%-38%, and when the wet paper sheet is subjected to the blind hole roll support, the dryness of the dewatered paper sheet is greater than or equal to 40%-42%. When the dryness of the dewatered paper sheet is greater than or equal to 40%-42%, the water content in the paper sheet is small, which is beneficial to reducing the energy consumption of the drying treatment. Finally, the dewatered paper sheet is subjected to drying treatment to obtain wiping paper. The temperature of the drying treatment is 65-85℃, the time of the drying treatment is 1-2h, the dryness of the wiping paper is greater than or equal to 94%, so that the high grammage product also has sufficient drying performance, which is beneficial to preparing the wiping paper with low cost and excellent tensile properties under drying and wetting conditions.

[0038] For example, in order to make the product have good air permeability and aesthetic appearance, the embodiment of the present application can also use a ceramic knife to perform creping treatment on the wiping paper; the creping rate of the wiping paper is 11% to 13%, and the curling speed of the ceramic knife is 450 m / min to 650 m / min. During the creping process, the fibers and the scraper produce intense interaction, internal changes occur, micro-creases are formed, and macro-creases are gradually stacked. In this experiment, a ceramic knife is used instead of a steel knife because the crease structure changes slowly when a ceramic creping scraper is used, which is very helpful for hand feeling and creases.

[0039] The embodiment of the present application also provides a wiping paper, which comprises paper fibers, dry strength agent, wet strength agent and process aid, and the basis weight of the wiping paper is 20 g / m 2 ~ 45 g / m 2 The longitudinal tensile index of the wiping paper is 31.0 Nm / g to 38.0 Nm / g, the transverse tensile index of the wiping paper is 18.0 Nm / g to 25.0 Nm / g, the longitudinal wet tensile strength of the wiping paper is 340 Nm / g to 450 N / m, and the mass fraction ratio of the dry strength agent, the wet strength agent and the process aid is (8-10):(7-8):(0.32-0.42). Under the joint action of the three, a wiping paper with low cost and good tensile performance under dry and wet conditions can be produced.

[0040] In order to verify the effect of the wiping paper preparation method provided by the embodiment of the present application, the embodiment of the present application is used for demonstration.

[0041] Embodiment one

[0042] Firstly, a papermaking pulp is prepared: raw wood chips are impregnated in a sulfation solution at an impregnation temperature of 95 ℃ for 30 min by using a pre-soaking tower to obtain impregnated wood chips. Then, the impregnated wood chips are cooked in a sulfation solution at 140 ℃ for 1 h by using a digester to obtain a kraft wet pulp. The kraft wet pulp is disintegrated, desludged, and then milled by a short fiber conical refiner, the beating consistency of the kraft wet pulp is 4.0%, and the beating degree of the kraft wet pulp is 23°SR. Then, the commercial bleached softwood pulp is disintegrated, desludged, and then milled by a long fiber conical refiner, the beating consistency of the bleached softwood pulp is 4.0%, and the beating degree of the bleached softwood pulp is 30°SR. Finally, the kraft wet pulp and the commercial bleached softwood pulp are mixed and milled by a conical refiner to obtain a papermaking pulp. The beating consistency of the papermaking pulp is 3.0%, and the beating degree of the papermaking pulp is 41°SR.

[0043] The mass fraction ratio of the kraft wet pulp and the commercial bleached softwood pulp is 3:2.

[0044] Second step, preparation of pretreatment pulp: the concentration of papermaking pulp is adjusted to 3% by white water, cationic starch, polyamide polyamine epichlorohydrin and process additives are added into the papermaking pulp to obtain the pretreatment pulp.

[0045] The mass fraction ratio of cationic starch, polyamide polyamine epichlorohydrin and process additives is 8:7:0.32; the process additives include polyoxyethylene alkyl phenol ether, isothiazolinone and dimethyl silicone oil, and the mass fraction ratio is 0.15:0.07:0.1.

[0046] Third step, preparation of wiping paper: the pretreatment pulp is sent into the wire layer headbox, then the long net department, the pulp concentration on the wire is 0.3%, the pulp speed ratio is 0.950:1, the wet paper is formed by dewatering through the long net department, and the dryness of the wet paper is equal to 14%. The wet paper is subjected to vacuum roll, and the dryness of the wet paper is equal to 36%, then the wet paper is subjected to blind hole roll, and the dryness of the wet paper is equal to 40%, the dewatered paper is obtained. The dewatered paper is dried at 65℃ for 1h to obtain the wiping paper, and the dryness of the wiping paper is equal to 94%. The wiping paper is subjected to creping treatment by ceramic knife, the creping rate is 11%, and the curling speed of the ceramic knife is 450m / min.

[0047] It is measured that the basis weight of the wiping paper is 20g / m 2 , the longitudinal tensile index of the wiping paper is 31.0Nm / g, the transverse tensile index of the wiping paper is 18.0Nm / g, and the longitudinal wet tensile strength is 340N / m.

[0048] Example two

[0049] First step, preparation of papermaking pulp: the raw material wood chips are impregnated in the sulfation solution at an impregnation temperature of 105℃ for 30min by using the pre-soaking tower to obtain the impregnated wood chips. Then, the impregnated wood chips are cooked in the sulfation solution at 145℃ for 1h by using the digester to obtain the kraft wet pulp. The kraft wet pulp is disintegrated, desludged, and then milled by the short fiber conical refiner, the beating consistency of the kraft wet pulp is 4.5%, and the beating degree of the kraft wet pulp is 24°SR. Then, the commercial bleached softwood pulp is disintegrated, desludged, and then milled by the long fiber conical refiner, the beating consistency of the bleached softwood pulp is 4.5%, and the beating degree of the bleached softwood pulp is 33°SR. Finally, the kraft wet pulp and the commercial bleached softwood pulp are mixed and milled by the conical refiner to obtain the papermaking pulp. The beating consistency of the papermaking pulp is 3.0%, and the beating degree of the papermaking pulp is 42°SR.

[0050] The mass fraction ratio of the kraft wet pulp and the commercial bleached softwood pulp is 3:2.5.

[0051] Second step, preparation of pretreatment pulp: the concentration of papermaking pulp is adjusted to 3.5% by white water, cationic starch, polyamide polyamine epichlorohydrin and process additives are added into the papermaking pulp to obtain the pretreatment pulp.

[0052] The mass fraction ratio of cationic starch, polyamide polyamine epichlorohydrin and process additives is 8:8:0.35; the process additives include polyoxyethylene alkyl phenol ether, isothiazolinone and dimethyl silicone oil, and the mass fraction ratio is 0.15:0.1:0.1.

[0053] Third step, preparation of wiping paper: the pretreatment pulp is sent into the wire layer headbox, then the long net department, the pulp concentration on the wire is 0.3%, the pulp speed ratio is 0.950:1, the wet paper is formed by dewatering through the long net department, and the dryness of the wet paper is equal to 16%. The wet paper is subjected to vacuum roll, and the dryness of the wet paper is equal to 38%, then the wet paper is subjected to blind hole roll, and the dryness of the wet paper is equal to 41%, the dewatered paper is obtained. The dewatered paper is dried at 75℃ for 1.5h to obtain the wiping paper, and the dryness of the wiping paper is equal to 95%. The wiping paper is subjected to creping treatment by ceramic knife, the creping rate is 11%, and the curling speed of the ceramic knife is 450m / min.

[0054] It is measured that the basis weight of the wiping paper is 35g / m 2 , the longitudinal tensile index of the wiping paper is 33.0Nm / g, the transverse tensile index of the wiping paper is 20.0Nm / g, and the longitudinal wet tensile strength is 380N / m.

[0055] Example three

[0056] First step, preparation of papermaking pulp: the raw material wood chips are impregnated in the sulfation solution at an impregnation temperature of 105℃ for 30min by using the pre-soaking tower to obtain the impregnated wood chips. Then, the impregnated wood chips are cooked in the sulfation solution at 150℃ for 1h by using the digester to obtain the kraft wet pulp. The kraft wet pulp is disintegrated, desludged, and then milled by the short fiber conical refiner, the beating consistency of the kraft wet pulp is 5%, and the beating degree of the kraft wet pulp is 26°SR. Then, the commercial bleached softwood pulp is disintegrated, desludged, and then milled by the long fiber conical refiner, the beating consistency of the bleached softwood pulp is 5%, and the beating degree of the bleached softwood pulp is 34°SR. Finally, the kraft wet pulp and the commercial bleached softwood pulp are mixed and milled by the conical refiner to obtain the papermaking pulp. The beating consistency of the papermaking pulp is 3.0%, and the beating degree of the papermaking pulp is 42°SR.

[0057] The mass fraction ratio of the kraft wet pulp and the commercial bleached softwood pulp is 3:2.5.

[0058] Second step, preparation of pretreatment pulp: the concentration of papermaking pulp is adjusted to 3.6% by white water, cationic starch, polyamide polyamine epichlorohydrin and process additives are added into the papermaking pulp to obtain the pretreatment pulp.

[0059] The mass fraction ratio of cationic starch, polyamide polyamine epichlorohydrin and process additives is 9:8:0.35; the process additives include polyoxyethylene alkyl phenol ether, isothiazolinone and dimethyl silicone oil, and the mass fraction ratio is 0.15:0.1:0.1.

[0060] Third step, preparation of wiping paper: the pretreatment pulp is sent into the wire layer headbox, then the long net department, the pulp concentration on the wire is 0.3%, the pulp speed ratio is 0.950:1, the wet paper is formed by dewatering through the long net department, and the dryness of the wet paper is equal to 16%. The wet paper is subjected to vacuum roll, and the dryness of the wet paper is equal to 38%, then the wet paper is subjected to blind hole roll, and the dryness of the wet paper is equal to 42%, the dewatered paper is obtained. The dewatered paper is dried at 75℃ for 1.5h to obtain the wiping paper, and the dryness of the wiping paper is equal to 96%. The wiping paper is subjected to creping treatment by ceramic knife, the creping rate is 13%, and the curling speed of the ceramic knife is 450m / min.

[0061] It is measured that the basis weight of the wiping paper is 38g / m 2 , the longitudinal tensile index of the wiping paper is 34.0Nm / g, the transverse tensile index of the wiping paper is 22.0Nm / g, and the longitudinal wet tensile strength is 420N / m.

[0062] Example four

[0063] First step, preparation of papermaking pulp: the raw material wood chips are impregnated in the sulfation solution at an impregnation temperature of 105℃ for 30min by using the pre-soaking tower to obtain the impregnated wood chips. Then, the impregnated wood chips are cooked in the sulfation solution at 150℃ for 1h by using the digester to obtain the kraft wet pulp. The kraft wet pulp is disintegrated, desludged, and then milled by the short fiber conical refiner, the beating consistency of the kraft wet pulp is 5%, and the beating degree of the kraft wet pulp is 27°SR. Then, the commercial bleached softwood pulp is disintegrated, desludged, and then milled by the long fiber conical refiner, the beating consistency of the bleached softwood pulp is 5%, and the beating degree of the bleached softwood pulp is 34°SR. Finally, the kraft wet pulp and the commercial bleached softwood pulp are mixed and milled by the conical refiner to obtain the papermaking pulp. The beating consistency of the papermaking pulp is 4.0%, and the beating degree of the papermaking pulp is 45°SR.

[0064] The mass fraction ratio of the kraft wet pulp and the commercial bleached softwood pulp is 3.5:2.5.

[0065] Second step, preparation of pretreatment pulp: the concentration of papermaking pulp is adjusted to 3.6% by white water, cationic starch, polyamide polyamine epichlorohydrin and process aid are added into the papermaking pulp to obtain pretreatment pulp.

[0066] The mass fraction ratio of cationic starch, polyamide polyamine epichlorohydrin and process aid is 10:8:0.35; the process aid includes polyoxyethylene alkyl phenol ether, isothiazolinone and dimethyl silicone oil, and the mass fraction ratio is 0.15:0.1:0.1.

[0067] Third step, preparation of wiping paper: the pretreatment pulp is sent into the wire layer headbox, then the long net department, the pulp concentration on the wire is 0.3%, the pulp speed ratio is 0.950:1, the wet paper is formed by dewatering through the long net department, and the dryness of the wet paper is equal to 16%. The wet paper is subjected to vacuum roll, and the dryness of the wet paper is equal to 38%, then the wet paper is subjected to blind hole roll, and the dryness of the wet paper is equal to 42%, the dewatered paper is obtained, the dewatered paper is dried at 75℃ for 1.5h to obtain the wiping paper, and the dryness of the wiping paper is equal to 96%. The wiping paper is subjected to creping treatment by ceramic knife, the creping rate is 13%, and the curling speed of the ceramic knife is 450m / min.

[0068] It is measured that the basis weight of the wiping paper is 45g / m 2 , the longitudinal tensile index of the wiping paper is 38.0Nm / g, the transverse tensile index of the wiping paper is 25.0Nm / g, and the longitudinal wet tensile strength is 450N / m.

[0069] The above is only a specific embodiment of the present application, obviously, various modifications and combinations can be made without departing from the spirit and scope of the present application. Accordingly, the specification and drawings are merely illustrative of the exemplary embodiments of the present application, and any and all modifications, variations, combinations or equivalents that are within the scope of the present application are intended to be covered. Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the claims of the present application and their equivalent technologies, the present application is intended to include these modifications and variations. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A wiping paper, characterized in that, The wiping paper comprises paper fibers, dry strength agents, wet strength agents, and process aids, and has a basis weight of 20 g / m². 2 ~45g / m 2 The longitudinal tensile index of the wiping paper is 31.0 Nm / g to 38.0 Nm / g, the transverse tensile index of the wiping paper is 18.0 Nm / g to 25.0 Nm / g, and the longitudinal wet tensile strength of the wiping paper is 340 N / m to 450 N / m. The mass ratio of the dry strength agent, the wet strength agent, and the process aid is (8-10):(7-8):(0.32-0.42); the method for preparing the wiping paper includes: The sulfate wet pulp and the bleached softwood pulp are mixed in a mass ratio of (3-3.5):(2-2.5) to obtain papermaking pulp; the freeness of the bleached softwood pulp is 30°SR-34°SR, and the freeness of the papermaking pulp is 41°SR-45°SR. A pretreated pulp is obtained by adding a dry strength agent, a wet strength agent, and process aids to the papermaking pulp; the process aids include a resin control agent, a bactericide, and a defoamer. The mass ratio of the resin control agent, the bactericide, and the defoamer is (0.15-0.2):(0.07-0.1):(0.1-0.12). The pretreated slurry is then formed into wiping paper.

2. The wiping paper according to claim 1, characterized in that, The preparation method further includes: Wood chips are impregnated in a sulfation solution to obtain impregnated wood chips; The impregnated wood chips are cooked in the sulfation solution to obtain the sulfate wet pulp; the sulfation solution includes sodium hydroxide solution and sodium sulfide solution, the impregnation temperature is 95℃~105℃, and the cooking temperature is 140℃~150℃.

3. The wiping paper according to claim 1, characterized in that, The beating concentration of the sulfate wet pulp is 4.0% to 5.0%, the beating degree of the sulfate wet pulp is 23°SR to 27°SR, the beating concentration of the bleached softwood pulp is 4.0% to 5.0%, and the beating concentration of the paper pulp is 3.0% to 4.0%.

4. The wiping paper according to claim 1, characterized in that, The concentration of the pretreated slurry on the wire is 0.3% to 0.55%, and the slurry-to-wire ratio is (0.950 to 0.970):

1.

5. The wiping paper according to any one of claims 1 to 4, characterized in that, The step of forming the pretreated slurry into wipes includes: The pretreated pulp is dehydrated and shaped to obtain a wet paper sheet; The wet paper sheet is subjected to multiple rollers to obtain a dehydrated paper sheet; The dehydrated paper is dried to obtain wiping paper.

6. The wiping paper according to claim 5, characterized in that, The idler roller is used twice: the first idler roller is a vacuum idler roller, and the second idler roller is a blind hole idler roller. When the wet paper sheet is subjected to the vacuum idler roller, the dryness of the wet paper sheet is greater than or equal to 36% to 38%. When the wet paper sheet is subjected to the blind hole idler roller, the dryness of the dewatered paper sheet is greater than or equal to 40% to 42%.

7. The wiping paper according to claim 5, characterized in that, The drying temperature is 65℃~85℃, the drying time is 1h~2h, and the dryness of the wiping paper is greater than or equal to 94%.

8. The wiping paper according to claim 5, characterized in that, The preparation method further includes: using a ceramic knife to wrinkle the wiping paper; the wrinkling rate of the wiping paper is 11% to 13%, and the curling speed of the ceramic knife is 450m / min to 650m / min.

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