Multi-layer embossed industrial wiping paper and preparation method thereof

Abstract

The invention relates to multi-layer embossed industrial wiping paper and a preparation method thereof. The preparation method comprises the following steps: respectively carrying out repulping treatment on long-fiber pulp containing softwood pulp and hardwood pulp and short-fiber pulp containing hardwood pulp to obtain long-fiber repulping pulp and short-fiber repulping pulp; performing pulping treatment on the long-fiber repulping slurry, and performing defibering treatment on the short-fiber repulping slurry; mixing the long fiber slurry and the short fiber slurry, diluting, performing fine fibration through a leveling mill, and adding a wet strength agent into the mixed slurry; the pulp is diluted and then subjected to forming, squeezing, drying and wrinkling, and industrial wiping paper base paper is obtained; and knurling and gluing the raw paper of the industrial wiping paper to finally obtain the multi-layer knurled industrial wiping paper. Compared with the prior art, the multi-layer embossed industrial wiping paper which is thick, fluffy and excellent in performance is finally prepared by taking environment-friendly and degradable plant fibers as raw materials, and the use requirements of various industrial wiping scenes can be met.

Description

Technical Field

[0001] The invention belongs to the technical field of papermaking, and in particular relates to a multi-layer embossed industrial wiping paper and a preparation method thereof. Background Art

[0002] With the rapid development of industrialization and intelligent manufacturing, the demand for wiping products in the manufacturing industry is becoming increasingly prominent. In current industrial scenarios such as machinery manufacturing, equipment maintenance, and precision instrument processing, traditional wiping needs are generally met with wiping cloths made from bundled textile rags. Although these products are low-cost and readily available, they have exposed numerous problems in actual use.

[0003] First, due to the loose structure and large size of wiping cloths, they not only take up a lot of storage space but are also inconvenient to operate in confined spaces. Second, the fiber structure of the rags results in low oil absorption and poor wiping efficiency, often requiring repeated operations, resulting in a double waste of materials and time. More importantly, most wiping cloths in modern industry are made of non-degradable materials such as chemical fibers. These materials require special treatment after use, which not only increases the company's environmental protection disposal costs, but their slow degradation process also causes long-term pollution to soil and water sources. In addition, traditional wiping cloths are prone to fiber shedding when contacting precision components, which may affect the operating accuracy of the equipment. The existence of the above problems makes it increasingly difficult for existing wiping solutions to meet the diverse needs of modern manufacturing for efficient, environmentally friendly, and precise operations.

[0004] CN111893801A discloses a high-absorbency, negative ion dry-process industrial wiping paper base and process. Metal fibers and adhesives are added to the pulp, followed by high-temperature steaming and drying, combined with a negative ion dry process to enhance the paper's strength and toughness. However, the use of metal fibers, adhesives, and other non-degradable chemicals in these industrial wiping papers fails to meet environmentally friendly production requirements. Furthermore, the water absorption performance of these industrial wiping papers remains unpredictable, and a sustainable industrial wiping product with both excellent strength and absorbency remains elusive.

[0005] Therefore, in order to address the problems of low strength, poor absorption performance and high environmental pressure of the above-mentioned industrial wiping products, it is urgent to develop a new type of industrial wiping paper and its preparation method. Summary of the Invention

[0006] The purpose of the present invention is to provide a multi-layer embossed industrial wiping paper and a preparation method thereof in order to overcome the problems of low strength, poor absorption performance and high environmental pressure of existing industrial wiping products.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] The present invention first provides a method for preparing a multi-layer embossed industrial wiping paper, the preparation method comprising the following steps:

[0009] S1: pulping a long fiber pulp containing softwood pulp and hardwood pulp and a short fiber pulp containing hardwood pulp to obtain a 4-6 wt% long fiber pulp pulp and a 4-6 wt% short fiber pulp pulp;

[0010] S2: refining the long fiber pulp obtained in S1 and de-slurrying the short fiber pulp obtained in S1;

[0011] S3: Mix the long fiber pulp and short fiber pulp obtained in S2 in a mass ratio of (2.5-4.5):1;

[0012] S4: diluting the mixed slurry obtained in S3 to 3-4 wt% and then subjecting it to fine fiberization by uniform grinding, and adding a wet strength agent to the mixed slurry;

[0013] S5: finally diluting the slurry obtained in S4 to 0.2-0.3 wt%, followed by forming, pressing, drying and creasing to obtain industrial wiping paper base paper;

[0014] S6: embossing and gluing the industrial wiping paper base paper obtained in S5 to finally obtain a multi-layer embossed industrial wiping paper.

[0015] Furthermore, in step S1, the pulping treatment time is 8-15 minutes, and the pulp after the pulping treatment is pumped into the long fiber beating pre-pulping tank and the short fiber beating pre-pulping tank respectively.

[0016] Furthermore, in step S2, the power of the refining process is 220-270 kW.

[0017] Furthermore, in step S2, the power of the decongestion treatment is 200-250kW.

[0018] Furthermore, in step S4, the power of the leveling mill is 140-150 kW.

[0019] Furthermore, in step S4, the amount of the wet strength agent added is 25-35 kg / t.

[0020] Furthermore, in step S5, the linear pressure of the dewatering roller during pressing is 95-120 kN / cm.

[0021] Furthermore, in step S5, the drying cylinder air inlet pressure is 6.5-6.8 bar, and the air inlet temperature at the dry end of the air hood is 130-145°C.

[0022] Furthermore, in step S5, the wrinkling rate after wrinkling is controlled at 18-23%.

[0023] Furthermore, in step S6, the embossing and gluing use an embossing and gluing composite processing unit, which specifically includes: an embossing component, including multiple groups of mutually matching embossing steel rollers and embossing rubber rollers, and multiple layers of industrial wiping paper base paper pass through the corresponding embossing steel rollers and embossing rubber rollers respectively; a gluing component, including a glue feed roller and an anilox roller, and the glue in the glue tank passes through the glue feed roller and the anilox roller in turn and is evenly coated on the surface of the paper sheet; a composite rubber roller, used to composite the multiple layers of embossed industrial wiping paper base paper together.

[0024] Furthermore, the production speed of the embossing and gluing composite processing unit is 80-100 m / min, the embossing pressure is 3-4 bar, and the gluing amount is 10-15 kg / ton of paper.

[0025] The present invention also provides a multi-layer embossed industrial wiping paper prepared by the preparation method.

[0026] Furthermore, the multi-layer embossed industrial wiping paper comprises at least two layers of tightly fitted industrial wiping paper base paper.

[0027] Furthermore, the mass ratio of coniferous wood to hardwood in the industrial wiping paper base paper is (6-7):(3-4).

[0028] In this invention, softwood fibers are longer and more expensive, while hardwood fibers are shorter and less expensive. A reasonable combination of these two fibers can achieve a balance between cost and quality. Using too much softwood fiber can lead to excessive costs and poor quality; using too little can result in paper strength that doesn't meet test requirements.

[0029] Furthermore, the multi-layer embossed industrial wiping paper has a longitudinal wet tensile strength of not less than 1100 mN, and a transverse liquid absorption height of not less than 60 mm / 100 s.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] (1) The present invention uses environmentally friendly and degradable plant fibers as raw materials, and first makes industrial wiping paper base paper through a reasonable ratio of coniferous wood and hardwood. Then, through the coordinated cooperation of embossing and gluing processes, a thick, fluffy multi-layer embossed industrial wiping paper with excellent mechanical properties and absorption properties is finally produced, which can meet the use requirements of various industrial wiping scenarios.

[0032] (2) The present invention introduces a wet strength agent into the preparation process, which can significantly enhance the mechanical strength of the paper in a wet state, so that the paper can still maintain a certain strength when it is wet or soaked in water, meeting the use requirements of industrial wiping paper in various applications.

[0033] (3) The embossing process of the present invention makes the paper more fluffy, and the paper has better water absorption and oil absorption. The gluing process is to tightly fit the double-layer paper and lock the embossed guide groove to ensure that the liquid is not easy to flow after absorption, further improving the water absorption performance of industrial wiping paper.

[0034] (4) Compared with traditional industrial wiping cloth, the multi-layer embossed industrial wiping paper of the present invention is lighter in weight, smaller in size, and more convenient to use by point-by-point extraction; and it does not contain chemical fibers, metal fibers and other non-degradable raw materials, and is more in line with the requirements of environmental protection and degradability. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The present invention is a flow chart of the preparation method of the multi-layer embossed industrial wiping paper.

[0036] Figure 2 The figure is a schematic flow chart of the production system of the multi-layer embossed industrial wiping paper of the present invention.

[0037] Figure 3 It is a structural schematic diagram of the embossing and gluing composite processing unit of the present invention.

[0038] Figure 4 Schematic diagram of the embossed pattern of the present invention. DETAILED DESCRIPTION

[0039] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0040] Unless otherwise noted, the reagents, methods, instruments, and equipment used in the present invention are conventional in the art. Unless otherwise noted, the reagents and materials used in the following examples were commercially available. The wet strength agent used in the present invention is a 12.5% ​​solids polyamide epichlorohydrin, a cationic amber liquid, model HK-2, purchased from Suzhou Hengkang.

[0041] The first aspect of the present invention provides a method for preparing a multi-layer embossed industrial wiping paper, such as Figure 1 As shown, the preparation method comprises the following steps:

[0042] S1: pulping a long fiber pulp containing softwood pulp and hardwood pulp and a short fiber pulp containing hardwood pulp to obtain a 4-6 wt% long fiber pulp pulp and a 4-6 wt% short fiber pulp pulp;

[0043] S2: refining the long fiber pulp obtained in S1 and de-slurrying the short fiber pulp obtained in S1;

[0044] S3: Mix the long fiber pulp and short fiber pulp obtained in S2 in a mass ratio of (2.5-4.5):1;

[0045] S4: diluting the mixed slurry obtained in S3 to 3-4 wt% and then subjecting it to fine fiberization by uniform grinding, and adding a wet strength agent to the mixed slurry;

[0046] S5: finally diluting the slurry obtained in S4 to 0.2-0.3 wt%, followed by forming, pressing, drying and creasing to obtain industrial wiping paper base paper;

[0047] S6: embossing and gluing the industrial wiping paper base paper obtained in S5 to finally obtain a multi-layer embossed industrial wiping paper.

[0048] In some specific embodiments, the production system of the multi-layer embossed industrial wipe paper is as follows Figure 2 The production system specifically includes: a long fiber pulping unit, which includes a long fiber pulper, a long fiber tapping pre-stocking tank, a pulping machine and a long fiber tapping post-stocking tank connected in sequence; a short fiber pulping unit, which includes a short fiber pulper, a short fiber tapping pre-stocking tank, a deflaker and a short fiber tapping post-stocking tank connected in sequence; a mixing unit, which includes a pulping tank, a leveling mill and a pulping tank connected in sequence, for mixing the pulp in the long fiber tapping post-stocking tank and the short fiber tapping post-stocking tank for subsequent papermaking; a papermaking unit, which includes a pulping pump and a papermaking machine connected in sequence, and the papermaking machine includes a pressing section and a drying section; a slitting unit, which includes a paper winding section and a rewinding and slitting section, for slitting the dried paper into industrial wiping paper base paper to be processed; and an embossing and gluing composite processing unit.

[0049] In some specific embodiments, in step S1, the pulping treatment time is 8-15 minutes, and the pulp after the pulping treatment is pumped into the long fiber tapping stock tank and the short fiber tapping stock tank respectively.

[0050] In some specific embodiments, in step S2, the power of the refining process is 220-270 kW.

[0051] In some specific embodiments, in step S2, the power of the degassing treatment is 200-250kW.

[0052] In some specific embodiments, in step S4, the power of the leveling mill is 140-150 kW.

[0053] In some specific embodiments, in step S4, the amount of the wet strength agent added is 25-35 kg / t.

[0054] In some specific embodiments, in step S5, the linear pressure of the dewatering roller during pressing is 95-120 KN / cm.

[0055] In some specific embodiments, in step S5, the drying cylinder inlet pressure is 6.5-6.8 bar, and the hood dry end inlet air temperature is 130-145°C.

[0056] In some specific embodiments, in step S5, the wrinkling rate after wrinkling is controlled at 18-23%.

[0057] In some specific embodiments, in step S6, the embossing and gluing are performed using an embossing and gluing composite processing unit. Figure 3 As shown, the embossing and gluing composite processing unit specifically includes: an embossing component, including multiple sets of mutually matching embossing steel rollers and embossing rubber rollers, and multiple layers of industrial wiping paper pass through the corresponding embossing steel rollers and embossing rubber rollers respectively; a gluing component, which includes a glue feed roller and an anilox roller, and the glue in the glue tank passes through the glue feed roller and the anilox roller in turn and is evenly coated on the surface of the paper sheet; a composite rubber roller, which is used to composite the multiple layers of embossed industrial wiping paper together.

[0058] In some more specific embodiments, the production speed of the embossing and gluing composite processing unit is 80-100 m / min, the embossing pressure is 3-4 bar, and the gluing amount is 10-15 kg / ton of paper.

[0059] The second aspect of the present invention provides a multi-layer embossed industrial wiping paper prepared by the above-mentioned preparation method, wherein the embossed pattern is as follows: Figure 4 As shown, the paper has leaf patterns evenly distributed across it.

[0060] In some specific embodiments, the multi-layer embossed industrial wiping paper comprises at least two layers of tightly-fitted industrial wiping paper base papers.

[0061] In some specific embodiments, the mass ratio of coniferous wood to hardwood in the industrial wiping paper base paper is (6-7):(3-4).

[0062] In some specific embodiments, the multi-layer embossed industrial wiping paper has a longitudinal wet tensile strength of not less than 1100 mN and a transverse liquid absorption height of not less than 60 mm / 100 s.

[0063] The above embodiments can be implemented individually or in any combination of two or more. The above embodiments will be described in more detail below with reference to specific examples.

[0064] Example 1:

[0065] This embodiment provides an 18g double-layer embossed industrial wiping paper, the production method of which specifically includes the following process steps:

[0066] (1) Four bags of coniferous wood pulp and one bag of broadleaf wood pulp of equal weight were put into the long fiber pulper, and white water was added to the pulper to a concentration of about 5.5 wt% for crushing. The crushing time was 10 minutes, and then the pulp was pumped into the long fiber pulping tank.

[0067] Put 5 bags of hardwood pulp into the staple pulper, add white water to the concentration of about 5.5wt% for crushing, the crushing time is 10 minutes, and then pump it into the staple pulp tank.

[0068] (2) Add water to the pulp in the long fiber beating pre-pulp pool to adjust the concentration to about 4.8wt% and pass it through the pulping machine. By controlling the pulping power to 240kw, the fibers are cut and separated into fibers and then pumped into the long fiber beating post-pulp pool.

[0069] The slurry in the pulp pool before staple fiber beating is added with water to adjust the concentration to about 4.6wt%, and then passed through a deflaker. After being deflaked by the deflaker, it is pumped into the pulp pool after staple fiber beating.

[0070] (3) The pulp in the pulp pool after long fiber beating and the pulp in the pulp pool after short fiber beating are pumped into the mixed pulp pool in a ratio of 80%:20%.

[0071] (4) The pulp in the mixed pulp pool is added with water to adjust the concentration to about 3.5wt% and then passed through a uniform grinding mill. By controlling the pulping power to 145kw, the fibers are further fibrillated and then pumped into the pulping pool.

[0072] (5) Add 30 kg / t of wet strength agent to the pulp in the pulping tank and dilute it to a concentration of about 2.82 wt%, ready to be pumped to the paper machine.

[0073] (6) The pulp is diluted to a concentration of 0.25 wt% by a pulp pump and fed into a crescent paper machine for forming, pressing, and drying. The linear pressure of the pressing and dewatering rollers is 100 kN / cm, the inlet pressure of the drying cylinder is 6.6 bar, and the inlet air temperature at the dry end of the hood is 135°C.

[0074] (7) The paper dried by the drying cylinder and the air hood is wrinkled by a wrinkling knife, and the wrinkling rate is controlled at 20%. The paper is wound up by the paper reel to form the initial roll of base paper, and then rewound and cut into the base paper of wiping paper.

[0075] (8) Embossing and gluing process: Two sets of wiping paper base papers are passed between corresponding embossing steel rollers and embossing rubber rollers for embossing. Glue is evenly applied to one side of the wiping paper base paper using a rubber feed roller and an anilox roller. Finally, the two embossed layers of industrial wiping paper base paper are laminated together using a laminating rubber roller. The production speed of the embossing and gluing laminating unit is 100 m / min, the embossing pressure is 3.5 bar, and the glue application amount is 11 kg / ton of paper.

[0076] Example 2

[0077] This embodiment provides an 18g double-layer embossed industrial wiping paper, the production method of which specifically includes the following process steps:

[0078] (1) Four bags of coniferous wood pulp and one bag of broadleaf wood pulp of equal weight were put into the long fiber pulper, and white water was added to the pulper to a concentration of about 5.3 wt% for crushing. The crushing time was 10 minutes, and then the pulp was pumped into the long fiber pulping tank.

[0079] Put 5 bags of hardwood pulp into the staple pulper, add white water to the concentration of about 5.2wt% for crushing, the crushing time is 10 minutes, and then pump it into the staple pulp tank.

[0080] (2) Add water to the pulp in the long fiber beating pre-pulp pool to adjust the concentration to about 4.5wt% and pass it through the pulping machine. By controlling the pulping power to 240kw, the fibers are cut and separated into fibers and then pumped into the long fiber beating post-pulp pool.

[0081] The pulp in the pulp pool before staple fiber beating is added with water to adjust the concentration to about 4.3wt%, and then passed through a deflaker. After being deflaked by the deflaker, it is pumped into the pulp pool after staple fiber beating.

[0082] (3) The pulp in the pulp pool after long fiber tapping and the pulp in the pulp pool after short fiber tapping are pumped into the mixed pulp pool in a ratio of 75%:25%.

[0083] (4) The pulp in the mixed pulp pool is added with water to adjust the concentration to about 3.4 wt% and then passed through a uniform grinding mill. By controlling the pulping power to 140 kW, the fibers are further fibrillated and then pumped into the pulping pool.

[0084] (5) Add 28 kg / t of wet strength agent to the pulp in the pulping tank and dilute it to a concentration of about 2.78 wt%, ready to be pumped to the paper machine.

[0085] (6) The pulp is diluted to a concentration of 0.23 wt% by a pulp pump and fed into a crescent paper machine for forming, pressing, and drying. The linear pressure of the pressing and dewatering rollers is 110 kN / cm, the inlet pressure of the drying cylinder is 6.7 bar, and the inlet air temperature at the dry end of the hood is 140°C.

[0086] (7) The paper dried by the drying cylinder and the air hood is wrinkled by a wrinkling knife, and the wrinkling rate is controlled at 21%. The paper is wound up by the paper reel to form the initial roll of base paper, and then rewound and cut into the base paper of wiping paper.

[0087] (8) Embossing and gluing process: Two sets of wipe paper base papers are passed between corresponding embossing steel rollers and embossing rubber rollers for embossing. Glue is evenly applied to one side of the wipe paper base paper using a rubber feed roller and an anilox roller. Finally, the two embossed layers of industrial wipe paper base paper are laminated together using a laminating rubber roller. The production speed of the embossing and gluing laminating unit is 90 m / min, the embossing pressure is 3.7 bar, and the glue application amount is 12 kg / ton of paper.

[0088] The present invention performs the following tests on the 18g double-layer embossed industrial wiping paper prepared in Examples 1 and 2:

[0089] The thickness is measured using a thickness gauge; the longitudinal tensile strength, transverse tensile strength and longitudinal wet tensile strength are measured using a computer tensile testing machine (according to the industry standard QBT 4761-2014 industrial wiping paper); and the transverse liquid absorption height is measured using a paper water absorption rate meter.

[0090] The above test results are summarized in Table 1.

[0091] Table 1 Performance test results of double-layer embossed industrial wiping paper

[0092]

[0093] As can be seen from the above table, the present invention can produce double-layer embossed industrial wiping paper with excellent mechanical properties and absorption properties through the coordinated cooperation of the reasonable process ratio of coniferous wood and hardwood and the embossing and gluing process in the preparation process. The embossing process makes the paper more fluffy, and the paper has better water and oil absorption. The gluing process is to fit the double-layer paper tightly and lock the embossed guide groove to ensure that the liquid is not easy to flow after absorption, further improving the water absorption performance of the industrial wiping paper. Before and after embossing and gluing, the longitudinal tensile strength can be increased by more than 30%, the longitudinal wet tensile strength can be increased by nearly 20%, and the transverse liquid absorption height can be increased by nearly 50%. All performances are significantly improved, which can meet the use requirements of various industrial wiping scenarios.

[0094] The above description of the embodiments is intended to facilitate understanding and use of the invention by those skilled in the art. It will be apparent that those skilled in the art can readily make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the present invention is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention, without departing from the scope of the present invention, should be within the scope of protection of the present invention.

Claims

1. A method for preparing a multi-layer embossed industrial wiping paper, characterized in that: The preparation method comprises the following steps: S1: pulping a long fiber pulp containing softwood pulp and hardwood pulp and a short fiber pulp containing hardwood pulp to obtain a 4-6 wt% long fiber pulp pulp and a 4-6 wt% short fiber pulp pulp; S2: refining the long fiber pulp obtained in S1 and de-slurrying the short fiber pulp obtained in S1; S3: Mix the long fiber pulp and short fiber pulp obtained in S2 in a mass ratio of (2.5-4.5):1; S4: diluting the mixed slurry obtained in S3 to 3-4 wt% and then subjecting it to fine fiberization by uniform grinding, and adding a wet strength agent to the mixed slurry; S5: finally diluting the slurry obtained in S4 to 0.2-0.3 wt%, followed by forming, pressing, drying and creasing to obtain industrial wiping paper base paper; S6: embossing and gluing the industrial wiping paper base paper obtained in S5 to finally obtain a multi-layer embossed industrial wiping paper.

2. The method for preparing a multi-layer embossed industrial wiping paper according to claim 1, characterized in that: In step S1, the pulping treatment time is 8-15 minutes, and the pulp after the pulping treatment is pumped into the long fiber beating pre-pulping tank and the short fiber beating pre-pulping tank respectively.

3. The method for preparing a multi-layer embossed industrial wiping paper according to claim 1, characterized in that: In step S2, the power of the refining process is 220-270 kW; The power of the deflaking treatment is 200-250kW.

4. The method for preparing a multi-layer embossed industrial wiping paper according to claim 1, characterized in that: In step S4, the power of the leveling mill is 140-150 kW.

5. The method for preparing a multi-layer embossed industrial wiping paper according to claim 1, characterized in that: In step S4, the amount of the wet strength agent added is 25-35 kg / t.

6. The method for preparing a multi-layer embossed industrial wiping paper according to claim 1, characterized in that: In step S5, the linear pressure of the dewatering roller during the pressing is 95-120 kN / cm; The drying cylinder inlet pressure is 6.5-6.8 bar, and the air inlet temperature at the dry end of the hood is 130-145°C; The wrinkling rate after wrinkling is controlled at 18-23%.

7. The method for preparing a multi-layer embossed industrial wiping paper according to claim 1, characterized in that: In step S6, the embossing and gluing are performed using an embossing and gluing composite processing unit, which specifically includes: The embossing assembly includes multiple sets of mutually matched embossing steel rollers and embossing rubber rollers, and multiple layers of industrial wiping paper pass through the corresponding embossing steel rollers and embossing rubber rollers respectively; The gluing assembly includes a glue feed roller and an anilox roller. The glue in the glue tank passes through the glue feed roller and the anilox roller in sequence and is evenly coated on the surface of the paper sheet. Composite rubber roller is used to laminate multiple layers of embossed industrial wiping paper base paper.

8. The method for preparing a multi-layer embossed industrial wiping paper according to claim 7, characterized in that: The production speed of the embossing and gluing composite processing unit is 80-100 m / min, the embossing pressure is 3-4 bar, and the gluing amount is 10-15 kg / ton of paper.

9. A multi-layer embossed industrial wiping paper, characterized in that: Prepared by the preparation method according to any one of claims 1 to 8; The multi-layer embossed industrial wiping paper comprises at least two layers of tightly fitted industrial wiping paper base paper; The mass ratio of softwood to hardwood in the industrial wiping paper base paper is (6-7):(3-4).

10. The multi-layer embossed industrial wiping paper according to claim 9, characterized in that: The multi-layer embossed industrial wiping paper has a longitudinal wet tensile strength of not less than 1100 mN and a transverse liquid absorption height of not less than 60 mm / 100 s.

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