A method for producing all-chemical broadleaf pulp toilet paper
By shaving the eucalyptus pulp and acacia pulp through fragmentation, slag removal and high concentration refining, the problems of poor paper strength and low production efficiency caused by short chemical broadleaf pulp fibers are solved, and cost reduction, product quality improvement and production efficiency are achieved.
Patent Information
- Application Number
- CN202411927389.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-04-04
AI Technical Summary
In the prior art, chemical broadleaf wood pulp fibers are shorter, resulting in poor strength, easy breakage, powder loss and low production efficiency of domestic paper.
Eucalyptus pulp and Acacia pulp are mixed with water after being broken and slag removal to form an intermediate, and then processed by high concentration refining to obtain pulp. Adjust the raw material ratio and refining conditions to increase the kneading and strength of the fibers.
It effectively reduces production costs, improves the strength and toughness of the paper, reduces powder loss, and improves production efficiency.
Smart Images
Figure CN119754100A_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of household paper manufacturing, and in particular relates to a method for producing all-chemical broadleaf pulp toilet paper. Background Art
[0002] With the increasing development of people's living needs, people pay more and more attention to daily hygiene needs, which is accompanied by fierce competition in the household paper industry. The production of household paper mainly uses two kinds of fiber raw materials, one is long fiber, including long fibers such as coniferous wood pulp or bamboo pulp, and the other is short fiber, including short fibers such as chemical hardwood pulp. Among them, coniferous wood pulp is mainly purchased through imports, with a price as high as 7,000 yuan / ton; the price of bamboo pulp is generally above 4,000 yuan / ton. The cost of pulp raw materials used in household paper remains high.
[0003] In order to effectively reduce the cost of raw materials, homemade virgin wood pulp chemical broadleaf pulp is usually selected as the raw material for household paper. However, in the prior art, due to the short fiber characteristics of chemical broadleaf pulp, the strength of the paper is relatively poor compared to long fiber pulp such as coniferous pulp and bamboo pulp. The paper is easy to break during use, the paper toughness is poor, and there is also the problem of paper powder falling. At the same time, the strength is low and the paper is easy to break during the papermaking process. If the fiber is too short, the retention rate of the net will decrease, and the spray water is easy to clog the spray pipe, resulting in low production efficiency.
[0004] Therefore, developing a production method for all-chemical broadleaf pulp toilet paper to solve the technical defects of the existing technology that it is difficult to achieve low production cost, good product quality and high production efficiency for household paper has become an urgent problem to be solved by technical personnel in this field. Summary of the invention
[0005] Based on this, it is necessary to provide a production method for all-chemical broadleaf pulp toilet paper to address the technical defects of existing technologies, such as low production cost of household paper, good product quality and high production efficiency.
[0006] The present application provides a method for preparing pulp, the preparation method comprising:
[0007] S1. Pretreatment: After the eucalyptus pulp and acacia pulp are crushed and deslagging, they are mixed with water to obtain an intermediate;
[0008] S2, refining: the intermediate is subjected to refining treatment to obtain pulp;
[0009] The concentration of the intermediate is 3.5% to 5.0%.
[0010] In one embodiment, in S2, the refining gap is less than 2 mm.
[0011] In one of the embodiments, in S1, the feed ratio of eucalyptus and acacia is (2.5-3.5):(6.5-7.5) by weight.
[0012] In one embodiment, the beating degree of the pulp is 36°SR-38°SR.
[0013] The present application also provides a method for producing household paper using pulp obtained by any of the above preparation methods, the production method comprising:
[0014] Step 1: Mix the pulp and the dry strength agent and dissolve them in water to obtain the first product;
[0015] Step 2: the first product is mixed with a retention and drainage aid, dissolved in water, and subjected to mesh forming to obtain a second product;
[0016] Step 3: The second product is dehydrated and dried in sequence, and the paper machine creping rate is set to 18% to 20% to obtain a household paper product.
[0017] In one embodiment, in step 1, the amount of each raw material added is 1000 parts of pulp and 3 to 4 parts of dry strength agent by weight.
[0018] In one embodiment, in step 1, the dry strength agent includes: glyoxal polyacrylamide and / or cationic starch.
[0019] In one embodiment, in step 2, the amount of each raw material added is 1000 parts of the first product and 5 to 6 parts of the retention and drainage aid, by weight.
[0020] In one embodiment, in step 2, the retention and drainage aids include: polyaluminium chloride and / or polyacrylamide.
[0021] In one embodiment, in step 3, the dehydration method is: vacuum press roll dehydration;
[0022] And / or, the drying method is: drying cylinder drying and hot air hood drying.
[0023] In summary, the present application provides a method for preparing pulp, which is: eucalyptus pulp and acacia pulp are crushed and deslagging, mixed with water to obtain an intermediate; the intermediate is subjected to pulping treatment to obtain pulp; the concentration of the intermediate is 3.5% to 5.0%. The present application also provides a production method for producing household paper using the pulp obtained by the above preparation method. In the technical scheme provided by the present application, eucalyptus pulp and acacia pulp are used as raw materials, which can effectively reduce the production cost. At the same time, high-concentration grinding is used for pulping. High-concentration grinding can increase the rubbing between fibers and reduce fiber cutting, thereby increasing the strength of the finished paper; further, the ratio of raw materials eucalyptus pulp and acacia pulp is adjusted to further enhance the strength of the finished paper. The fiber strength of the pulp is enhanced, and paper breaks are not likely to occur during the papermaking process, and the fibers will not clog the papermaking device, effectively improving the production efficiency. The production method of a fully chemical broadleaf pulp toilet paper provided by the present application solves the technical defects in the prior art that it is difficult to take into account the low production cost of household paper, good product quality and high production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.
[0025] Figure 1 A schematic diagram of a preparation process of a method for preparing pulp in the technical solution provided in an embodiment of the present application;
[0026] Figure 2 A schematic diagram of a production process of a method for producing household paper in the technical solution provided in an embodiment of the present application. DETAILED DESCRIPTION
[0027] The embodiment of the present application provides a method for producing all-chemical broadleaf pulp toilet paper, which is used to solve the technical defects in the prior art that it is difficult to achieve low production cost, good product quality and high production efficiency for household paper.
[0028] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.
[0029] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0031] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0032] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.
[0034] The following will be combined Figure 1 , for the preparation of pulp products.
[0035] Example 1
[0036] This embodiment is a specific embodiment of preparing pulp product 1.
[0037] S1. Preprocessing
[0038] 2000 kg of absolute dry eucalyptus pulp and 6000 kg of absolute dry acacia pulp are crushed and deslagging, and then mixed with 152-228 t of water to obtain intermediate 1. The concentration of intermediate 1 is 3.5%-5.0%.
[0039] S2. Refining
[0040] The intermediate 1 is subjected to pulping treatment, and the pulping gap is less than 2 mm, thereby obtaining a pulp product 1; wherein the beating degree of the pulp product 1 is 36°SR-38°SR. In the actual preparation process, the pulping tool is an ANDRITZ high-concentration mill, which acts on the internal structure of the fiber instead of only targeting the external fine fiberization, and mainly targets the interaction between the fibers, thereby increasing the curling and twisting and micro-compression of the fibers, cutting less fibers, and being more suitable for short fiber pulping, which further means less long fiber usage and less dust generated.
[0041] Example 2
[0042] This embodiment is a specific embodiment of preparing pulp product 2.
[0043] S1. Preprocessing
[0044] 2500kg of absolute dry eucalyptus pulp and 5500kg of absolute dry acacia pulp are crushed and deslagging, and then mixed with 152-228t of water to obtain intermediate 2. The concentration of intermediate 2 is 3.5%-5.0%.
[0045] S2. Refining
[0046] The intermediate 2 is subjected to pulping treatment, and the pulping gap is less than 2 mm, thereby obtaining a pulp product 2; wherein the beating degree of the pulp product 2 is 36°SR-38°SR. In the actual preparation process, the pulping tool is an ANDRITZ high-concentration mill, which acts on the internal structure of the fiber instead of only targeting the external fine fiberization, and mainly targets the interaction between the fibers, thereby increasing the curling and twisting and micro-compression of the fibers, cutting less fibers, and being more suitable for short fiber pulping, which further means less long fiber usage and less dust generated.
[0047] Example 3
[0048] This embodiment is a specific embodiment of preparing pulp product 3.
[0049] S1. Preprocessing
[0050] 2800 kg of absolute dry eucalyptus pulp and 5200 kg of absolute dry acacia pulp are crushed and deslagging, and then mixed with 152-228 t of water to obtain intermediate 3. The concentration of intermediate 3 is 3.5%-5.0%.
[0051] S2. Refining
[0052] The intermediate 3 is subjected to pulping treatment, and the pulping gap is less than 2 mm, thereby obtaining a pulp product 3; wherein the beating degree of the pulp product 3 is 36°SR-38°SR. In the actual preparation process, the pulping tool is an ANDRITZ high-concentration mill, which acts on the internal structure of the fiber instead of only targeting the external fine fiberization, and mainly targets the interaction between the fibers, thereby increasing the curling and twisting and micro-compression of the fibers, cutting less fibers, and being more suitable for short fiber pulping, which further means less long fiber usage and less dust generated.
[0053] The following will be combined Figure 2 , to prepare daily paper products.
[0054] Example 4
[0055] This embodiment is a specific embodiment of preparing a household paper product 1.
[0056] Step 1: 28571 kg of pulp and 3.5 kg of dry strength agent are mixed, dissolved in 4762 kg of water, and stirred evenly to obtain the first product 1; wherein the dry strength agent is glyoxal polyacrylamide.
[0057] Step 2: 33333 kg of the first product 1 is mixed with 6 kg of a retention and drainage aid, dissolved in 400068 kg of water, stirred evenly, and then formed into a mesh to obtain a second product 1; wherein the retention and drainage aid is polyaluminum chloride, and the concentration of the second product 1 is 7% to 10%.
[0058] Step 3: The second product 1 is dehydrated and dried in sequence, and the paper machine wrinkle rate is set to 18% to 20% to obtain a household paper product 1; wherein the dehydration method is vacuum press roller dehydration, and the drying method is cylinder drying. In the actual application process, the cylinder uses an Enchuang 80° composite knife to ensure that the cylinder coating is uniform, avoid local damage to the paper web due to the local hardness of the cylinder coating, and effectively reduce the risk of strength loss.
[0059] Example 5
[0060] This embodiment is a specific embodiment of preparing a household paper product 2.
[0061] Step 1: 28571 kg of pulp and 4 kg of dry strength agent are mixed, dissolved in 4763 kg of water, and stirred evenly to obtain the first product 2; wherein the dry strength agent is glyoxal polyacrylamide.
[0062] Step 2: 33333 kg of the first product 2 is mixed with 5.5 kg of a retention and drainage aid, dissolved in 400062 kg of water, stirred evenly for net forming, and the second product 2 is obtained; wherein the retention and drainage aid is polyacrylamide, and the concentration of the second product 2 is 7% to 10%.
[0063] Step 3: The second product 2 is dehydrated and dried in sequence, and the paper machine wrinkle rate is set to 18% to 20% to obtain a household paper product 2; wherein the dehydration method is vacuum press roller dehydration, and the drying method is cylinder drying. In the actual application process, the cylinder uses an Enchuang 80° composite knife to ensure that the cylinder coating is uniform, avoid local damage to the paper web due to the local hardness of the cylinder coating, and effectively reduce the risk of strength loss.
[0064] Example 6
[0065] This embodiment is a specific embodiment of preparing a household paper product 3.
[0066] Step 1: 28571 kg of pulp is mixed with 3 kg of dry strength agent, dissolved in 4763 kg of water, and stirred evenly to obtain the first product 3; wherein the dry strength agent is cationic starch.
[0067] Step 2: 33333kg of the first product 3 is mixed with 5kg of a retention and drainage aid, dissolved in 400056kg of water, stirred evenly for net forming, and the second product 3 is obtained; wherein the retention and drainage aid is polyacrylamide, and the concentration of the second product 3 is 7% to 10%.
[0068] Step 3: The second product 3 is dehydrated and dried in sequence, and the paper machine wrinkle rate is set to 18% to 20% to obtain a household paper product 3; wherein the dehydration method is vacuum press roller dehydration, and the drying method is steam hood hot air drying. In the actual application process, the drying cylinder uses an Enchuang 80° composite knife to ensure that the drying cylinder coating is uniform, avoid local damage to the paper web due to the local hardness of the drying cylinder coating, and effectively reduce the risk of strength loss.
[0069] Example 7
[0070] This example is a specific example of measuring the beneficial effects.
[0071] 7.1 Cost reduction
[0072] From the perspective of fiber cost comparison, the technical solution provided in the embodiment of the present application uses 100% low-cost chemical broadleaf pulp (eucalyptus pulp and acacia pulp), which reduces the cost by 780 yuan / ton of paper and 350 yuan / ton of paper compared to the technical solution using 20% coniferous pulp and 40% bamboo pulp.
[0073] Compared with the technical solution of using 20% coniferous pulp and 40% bamboo pulp, the use of 100% chemical broadleaf pulp saves the electricity cost used by the long fiber processing line and reduces the equipment loss of the long fiber processing line. Compared with the use of 20% coniferous pulp and 40% bamboo pulp, the use of 100% homemade chemical broadleaf pulp saves a total of 384.5 yuan / ton of paper and 162.8 yuan / ton of paper in fiber cost and energy consumption cost.
[0074] 7.2 Performance measurement
[0075] The tensile strength determination method is in accordance with the national standard GBT 24328.3-2009 “Toilet paper and its products Part 3: Determination of tensile strength, elongation at break and tensile energy absorption”.
[0076] Please refer to Table 1 for the test results. In this example, the reference substance used is a commercially available standard substance of the same type.
[0077] Table 1
[0078]
[0079] It can be concluded from Table 1 that, compared with the control product, the longitudinal tensile index, transverse tensile index and base paper density parameters of the three embodiments in this study are better than those of the commercially available standard products.
[0080] In summary, the present application provides a method for preparing pulp, which is: eucalyptus pulp and acacia pulp are crushed and deslagging, mixed with water to obtain an intermediate; the intermediate is subjected to pulping treatment to obtain pulp; the concentration of the intermediate is 3.5% to 5.0%. The present application also provides a production method for producing household paper using the pulp obtained by the above preparation method. In the technical scheme provided by the present application, eucalyptus pulp and acacia pulp are used as raw materials, which can effectively reduce the production cost. At the same time, high-concentration grinding is used for pulping. High-concentration grinding can increase the rubbing between fibers and reduce fiber cutting, thereby increasing the strength of the finished paper; further, the ratio of raw materials eucalyptus pulp and acacia pulp is adjusted to further enhance the strength of the finished paper. The fiber strength of the pulp is enhanced, and paper breaks are not likely to occur during the papermaking process, and the fibers will not clog the papermaking device, effectively improving the production efficiency. The production method of a fully chemical broadleaf pulp toilet paper provided by the present application solves the technical defects in the prior art that it is difficult to take into account the low production cost of household paper, good product quality and high production efficiency.
[0081] The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. At the same time, other implementation methods can be derived from the above-mentioned embodiments, so that structural and logical replacements and changes can be made without departing from the scope of this disclosure.
[0082] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.
Claims
1. A method for preparing pulp, characterized in that: The preparation method is: S1. Pretreatment: After the eucalyptus pulp and acacia pulp are crushed and deslagging, they are mixed with water to obtain an intermediate; S2, refining: the intermediate is subjected to refining treatment to obtain pulp; The concentration of the intermediate is 3.5% to 5.0%.
2. The preparation method according to claim 1, characterized in that: In S2, the refining gap is less than 2 mm.
3. The preparation method according to claim 1 or 2, characterized in that: In S1, the feed ratio of eucalyptus and acacia is (2.5-3.5):(6.5-7.5) by weight.
4. The preparation method according to claim 1 or 2, characterized in that: The beating degree of the pulp is 36°SR-38°SR.
5. A method for producing household paper using the pulp obtained by the preparation method according to any one of claims 1 to 4, characterized in that: The production method comprises: Step 1, mixing the pulp and the dry strength agent and dissolving them in water to obtain a first product; Step 2: the first product is mixed with a retention and drainage aid, dissolved in water, and subjected to mesh forming to obtain a second product; Step 3: The second product is dehydrated and dried in sequence to obtain a household paper product, wherein the wrinkle rate of the household paper product is 18% to 20%.
6. The production method according to claim 5, characterized in that: In step 1, the amount of each raw material added is 1000 parts of pulp and 3 to 4 parts of dry strength agent by weight.
7. The production method according to claim 5 or 6, characterized in that: In step 1, the dry strength agent includes: glyoxal polyacrylamide and / or cationic starch.
8. The production method according to claim 5, characterized in that: In step 2, the amount of each raw material added is 1000 parts of the first product and 5 to 6 parts of the retention and drainage aid, calculated by mass.
9. The production method according to claim 5 or 8, characterized in that: In step 2, the retention and drainage aids include: polyaluminium chloride and / or polyacrylamide.
10. The production method according to claim 5, characterized in that: In step 3, the dehydration method is: vacuum pressing roller dehydration; And / or, the drying method includes: drying cylinder drying and / or steam hood hot air drying.