CN111218840A - Paper pulp preparation method - Google Patents
Paper pulp preparation method Download PDFInfo
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- CN111218840A CN111218840A CN201911251596.1A CN201911251596A CN111218840A CN 111218840 A CN111218840 A CN 111218840A CN 201911251596 A CN201911251596 A CN 201911251596A CN 111218840 A CN111218840 A CN 111218840A
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- pulp
- paper pulp
- paper
- sugarcane
- bamboo raw
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C3/00—Pulping cellulose-containing materials
- D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
- D21D5/16—Cylinders and plates for screens
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/16—Sizing or water-repelling agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/28—Colorants ; Pigments or opacifying agents
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
The invention discloses a paper pulp preparation method, which adopts bamboo raw materials and sugarcane as raw materials, and prepares paper pulp through equipment operations such as a peeling machine, a cooking pot, a pulp washer, screening equipment, a constant-temperature water bath pot and the like. According to the invention, the bamboo raw pulp and the sugarcane pulp are effectively prepared and mixed, and the reasonable debugging proportion is adopted, so that the bamboo raw pulp and the sugarcane pulp cannot react after being mixed, the production and processing of paper pulp are ensured, meanwhile, the overall texture of the paper after production is ensured through the mixing and processing of the bamboo raw pulp and the sugarcane pulp, the loss of bamboo raw materials is further saved, the sugarcane achieves a good compensation effect, a large amount of wood is effectively saved, the national circular economy requirement and the environmental protection policy are met, and the waste is recycled, so that the economic benefit is good.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to a paper pulp preparation method.
Background
The paper pulp is a fibrous substance prepared by using plant fibers as raw materials through different processing methods and can be divided into mechanical paper pulp, chemical paper pulp and chemical mechanical paper pulp according to the processing methods; the pulp can be divided into wood pulp, straw pulp, hemp pulp, reed pulp, cane pulp, bamboo pulp, rag pulp and the like according to the used fiber raw materials, and can be divided into refined pulp, bleached pulp, unbleached pulp, high-yield pulp, semi-chemical pulp and the like according to different purities, and the pulp is generally widely used for manufacturing paper and paperboards, and the refined pulp is used for manufacturing special paper, is also often used as a raw material for manufacturing cellulose derivatives such as cellulose ester, cellulose ether and the like, and is also used in the fields of artificial fiber, plastics, coatings, films, gunpowder and the like.
The traditional pulping is a production process of utilizing a chemical method, a mechanical method or a method combining the chemical method and the mechanical method to dissociate plant fiber raw materials into natural color or bleached pulp, the commonly adopted technical process is to crush, steam cook, wash, screen, bleach, purify and dry the plant fiber raw materials, a biological pulping method is newly developed in modern times, a lignin structure is specially and directionally decomposed by special strains (white rot fungi, brown rot fungi and soft rot fungi), then the rest cellulose is dissociated by the mechanical or chemical method, and then bleaching is carried out, in the process, most lignin is decomposed and opened by organisms, the chemical method is only used as an auxiliary effect, and the used chemical products are fewer than the traditional method, so that little or no waste liquid can be discharged, and the method is an environment-friendly pulping and cleaning method.
However, based on the above research, the existing paper pulp blending and manufacturing process has many disadvantages, and paper pulp in the existing market is basically manufactured by the same raw material, so that the production requirement of paper is met, and the use requirements of different environments are met.
Disclosure of Invention
The present invention is directed to a method for producing pulp to solve the problems set forth in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a method of making pulp comprising the steps of:
the method comprises the following steps: preparing bamboo raw materials and sugar cane in a weight ratio of 50-70% and peeling the bamboo raw materials and the sugar cane by a peeling machine;
step two: putting the peeled bamboo raw material and the sugarcane into a cooking pot, and cooking and degrading to generate rough paper pulp;
step three: filtering out the degraded paper pulp, putting the paper pulp into a vacuum pulp washer, washing the paper pulp through multi-section countercurrent washing, and removing stains in the paper pulp;
step four: introducing the paper pulp with the stains removed into screening equipment for separation, and separating good pulp and pulp residues from the paper pulp by the screening equipment;
step five: and (3) adjusting the temperature of the constant-temperature water bath kettle, placing benign paper pulp in a storage container, adding clear water, uniformly mixing, placing the storage container in the constant-temperature water bath kettle, adding a bleaching agent when the temperature reaches the bleaching requirement, uniformly mixing again, and finally generating refined paper pulp.
Furthermore, the screening equipment separates coarse slag with the size larger than the seam width in the slurry through the screen seams of the screen plate, the screening equipment is a vibrating type flat screen, and the size of the screen seam is between 0.30mm and 0.35mm or between 0.20mm and 0.25 mm.
Furthermore, the cooking pot is used for delignifying the bamboo raw material and the sugarcane, the cooking temperature is 155-165 ℃, the cooking time is 0.7-1 h, and the cooking pot is a continuous horizontal pipe cooking pot.
Further, after the pulp is washed by the vacuum pulp washer, the pulp preparation method further comprises the steps of transferring the pulp into a plastic mesh bag or a cloth bag, washing with water, dehydrating the washed pulp to dryness by using a dehydrator, and then rubbing and mixing uniformly.
Compared with the prior art, the invention has the beneficial effects that: the method of the invention firstly clearly describes and explains the manufacturing process flow of the paper pulp, and simultaneously, the invention ensures that the bamboo pulp and the sugarcane pulp can not react after being mixed by effective preparation and mixing of the bamboo pulp and the sugarcane pulp and reasonable debugging proportion, ensures the production and processing of the paper pulp, and simultaneously ensures the integral texture of the paper after production by the mixing and processing of the bamboo pulp and the sugarcane pulp, so that the paper still has the advantages of the bamboo pulp paper, further saves the loss of the bamboo raw material, achieves good compensation effect of the sugarcane, effectively saves a large amount of wood, accords with the national circular economy requirement and the environmental protection policy, recycles waste, and has good economic benefit.
Drawings
FIG. 1 is a schematic process flow diagram of a pulp conditioning method of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to fig. 1, an embodiment of the present invention: a paper pulp preparation method adopts bamboo raw materials and sugarcane as raw materials, and prepares paper pulp through equipment operations such as a peeling machine, a cooking pot, a pulp washer, screening equipment, a constant-temperature water bath pot and the like, and is characterized in that: the method comprises the following five steps:
the method comprises the following steps: preparing bamboo raw materials and sugar cane in a weight ratio of 50-70% and peeling the bamboo raw materials and the sugar cane by a peeling machine; the peeling operation of the peeling machine is to better perform the subsequent cooking process;
step two: putting the peeled bamboo raw material and the sugarcane into a cooking pot, and cooking and degrading to generate rough paper pulp; before 100 ℃, the concentration of the cooking liquor is reduced to some extent, but lignin is not dissolved basically, alkali liquor permeates into the raw material at the stage, the main dissolved substances are starch, pectin, fat, resin and hemicellulose with low molecular weight of the raw material, the concentration of the cooking liquor is continuously reduced at the initial delignification stage, namely a heating stage of 100-150 ℃, but the concentration of the lignin is dissolved out only 26.6% (for the original lignin), namely a large amount of delignification stages, namely 150-165 ℃ at the highest temperature, and the lignin is dissolved out 63.2% (for the original lignin), at the moment, wood chips are dispersed into pulp, the concentration of the residual lignin is continuously reduced at the delignification stage, but the lignin is dissolved out only 8% (for the original lignin), and the carbohydrate degradation at the stage is more;
step three: filtering out the degraded paper pulp, putting the paper pulp into a vacuum pulp washer, washing the paper pulp through multi-section countercurrent washing, and removing stains in the paper pulp; the purity of the paper pulp is ensured;
step four: introducing the paper pulp with the stains removed into screening equipment for separation, and separating good pulp and pulp residues from the paper pulp by the screening equipment;
step five: and (3) adjusting the temperature of the constant-temperature water bath kettle, placing benign paper pulp in a storage container, adding clear water, uniformly mixing, placing the storage container in the constant-temperature water bath kettle, adding a bleaching agent when the temperature reaches the bleaching requirement, uniformly mixing again, and finally generating refined paper pulp.
Furthermore, the screening equipment separates coarse slag with the size larger than the seam width in the slurry through the screen seams of the screen plate, the screening equipment is a vibrating type flat screen, and the size of the screen seam is between 0.30mm and 0.35mm or between 0.20mm and 0.25 mm. Therefore, the vibrating type flat screen machine can be fully ensured to separate the slurry, and the high-quality production process is ensured.
Furthermore, the cooking pot is used for delignifying the bamboo raw material and the sugarcane, the cooking temperature is 155-165 ℃, the cooking time is 0.7-1 h, and the cooking pot is a continuous horizontal pipe cooking pot. Separating the waste liquid from the pulp by squeezing, filtering, etc., wherein: the black liquor is the waste liquor of alkaline pulping, and the red liquor is the waste liquor of acid pulping.
Furthermore, the operation of the peeling machine is to adapt to the chemical wood pulp cooking and meet the production requirement of wood chip ground wood pulp, the raw wood is sliced, the sliced wood chips are consistent in length and thickness and are orderly, the specification is that the length is 15-20 mm, the thickness is 3-5 mm, the thickness is not more than 20mm, the sliced wood chips are screened by a circular screen, and the qualification rate of the raw wood chips is more than 85%.
Further, after the pulp is washed by the vacuum pulp washer, the pulp preparation method further comprises the steps of transferring the pulp into a plastic mesh bag or a cloth bag, washing with water, dehydrating the washed pulp to dryness by using a dehydrator, and then rubbing and mixing uniformly. So as to ensure that the screening equipment carries out screening operation on the screening equipment.
Example 2
First, beating
1. The physical mechanical method is utilized to process the pulp, the operation can be completed through a disc refiner, and the fibers are separated into single fibers through the actions of extrusion, friction, kneading, shearing and the like.
2. Beating action
(1) Displacing and deforming the cell wall;
(2) breaking the outer layer (S) of the primary wall (P) and the secondary wall;
(3) fibrillation (fibrillation-two ends of one fiber and the fine fibers on the surface of the fiber are dispersed and fluffy);
the purpose of this operation is to increase the contact area between fibers and to enhance the interlacing force between fibers.
Secondly, sizing
Sizing means that the paper is obtained by adding water-resistant size to the pulp or by applying glue to the surface of the paper web
Resistance to liquid diffusion and penetration.
The purpose of sizing is to modify the surface energy of the fibers to control the penetration of aqueous liquids into the paper; paper sizing is typically for the following purposes:
(1) end use requirements such as liquid packaging, offset printing, wet food packaging, frozen poultry and produce shipping, tackiness, retention of water-based inks, and the like.
(2) Paper machine operations such as retention of size press liquor, retention of coating, retention of calender surface sizing, and the like.
(3) To resist accidental wetting, such as office papers, cereal or cosmetic packaging, grocery packaging, and the like.
The sizing agent must produce a hydrophobic fiber surface, the sizing agent should increase the hydrophobicity of the paper sheet, and it is also necessary that the hydrophobic portion of the sizing agent molecule should have a hydrophobic group on the molecular structure extending beyond the fiber surface. Thus, the liquid molecules will encounter molecules of the sizing agent that are hydrophobic, rather than hydrophilic cellulose and hemicellulose molecules, when in contact with the surface of the paper sheet.
In view of the above and the invention of example 1, the setting amount of the sizing agent is 1 to 5% when 50 to 70% of the bamboo material and 30 to 50% of the sugar cane are used as the raw materials.
Filling
The proper inorganic filler is added into the paper pulp to improve the optical performance (opacity) and the printing performance (smooth and uniform surface and good ink absorption) of paper sheets and reduce the cost, and the addition amount is 2-40%.
Four, chemical auxiliary agent
1. Dye:
the basic dye is alkaline blue, alkaline purple, rose red, brilliant green, etc.
The acid dyes are acid soap yellow, acid boiling red, acid green and the like.
Direct dyes are direct royal blue, direct yellow, direct scarlet and the like.
Wet strength agent, dry strength agent and retention aid.
2. A fluorescent whitening agent.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (4)
1. A method of producing pulp, comprising the steps of:
the method comprises the following steps: preparing bamboo raw materials and sugar cane in a weight ratio of 50-70% and peeling the bamboo raw materials and the sugar cane by a peeling machine;
step two: putting the peeled bamboo raw material and the sugarcane into a cooking pot, and cooking and degrading to generate rough paper pulp;
step three: filtering out the degraded paper pulp, putting the paper pulp into a vacuum pulp washer, washing the paper pulp through multi-section countercurrent washing, and removing stains in the paper pulp;
step four: introducing the paper pulp with the stains removed into screening equipment for separation, and separating good pulp and pulp residues from the paper pulp by the screening equipment;
step five: and (3) adjusting the temperature of the constant-temperature water bath kettle, placing benign paper pulp in a storage container, adding clear water, uniformly mixing, placing the storage container in the constant-temperature water bath kettle, adding a bleaching agent when the temperature reaches the bleaching requirement, uniformly mixing again, and finally generating refined paper pulp.
2. A method of producing pulp according to claim 1, characterized in that: the screening equipment separates coarse slag with the size larger than the seam width in the slurry through the screen seams of the screen plate, the screening equipment is a vibrating type flat screen, and the size of the seam of the screen seams is between 0.30mm and 0.35mm or between 0.20mm and 0.25 mm.
3. A method of producing pulp according to claim 1, characterized in that: the cooking pot is used for delignifying the bamboo raw material and the sugarcane, the cooking temperature is 155-165 ℃, the cooking time is 0.7-1 h, and the cooking pot is a continuous transverse pipe cooking pot.
4. A method of producing pulp according to claim 1, characterized in that: after the pulp is washed by the vacuum pulp washer, the pulp preparation method further comprises the steps of transferring the pulp into a plastic mesh bag or a cloth bag, washing with water, dehydrating the washed pulp to dryness by using a dehydrator, and then rubbing and mixing uniformly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911251596.1A CN111218840A (en) | 2019-12-09 | 2019-12-09 | Paper pulp preparation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911251596.1A CN111218840A (en) | 2019-12-09 | 2019-12-09 | Paper pulp preparation method |
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| CN111218840A true CN111218840A (en) | 2020-06-02 |
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| CN201911251596.1A Pending CN111218840A (en) | 2019-12-09 | 2019-12-09 | Paper pulp preparation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117328286A (en) * | 2023-10-30 | 2024-01-02 | 华邦特西诺采新材料股份有限公司 | Bamboo pulp paper and preparation method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101446054A (en) * | 2008-12-23 | 2009-06-03 | 华南理工大学 | Total-chlorine-free bleaching method of paper pulp production line with annual output of more than 50,000 tons |
| CN101451320A (en) * | 2007-12-05 | 2009-06-10 | 山东泉林纸业有限责任公司 | Grass type low brightness pulp, preparation method and use thereof |
| US20110297343A1 (en) * | 2008-12-09 | 2011-12-08 | Shandong Fuyin Paper & Enviromental Protection Technology Co., Ltd. | Raw paper and production method and application thereof |
| CN102337687A (en) * | 2010-07-15 | 2012-02-01 | 北京英力和泓新材料技术有限公司 | Novel pulping process for obtaining high performance fiber at high yield from plants |
| US20120132379A1 (en) * | 2009-04-09 | 2012-05-31 | Zylum Beteiligungsgesellschaft Mbh & Co Patente Ii Kg | Method for obtaining cellulose from biomass comprising lignocellulose |
| CN106223094A (en) * | 2016-07-29 | 2016-12-14 | 云南新平南恩糖纸有限责任公司 | Mixed pulp paper technology |
-
2019
- 2019-12-09 CN CN201911251596.1A patent/CN111218840A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101451320A (en) * | 2007-12-05 | 2009-06-10 | 山东泉林纸业有限责任公司 | Grass type low brightness pulp, preparation method and use thereof |
| US20110297343A1 (en) * | 2008-12-09 | 2011-12-08 | Shandong Fuyin Paper & Enviromental Protection Technology Co., Ltd. | Raw paper and production method and application thereof |
| CN101446054A (en) * | 2008-12-23 | 2009-06-03 | 华南理工大学 | Total-chlorine-free bleaching method of paper pulp production line with annual output of more than 50,000 tons |
| US20120132379A1 (en) * | 2009-04-09 | 2012-05-31 | Zylum Beteiligungsgesellschaft Mbh & Co Patente Ii Kg | Method for obtaining cellulose from biomass comprising lignocellulose |
| CN102337687A (en) * | 2010-07-15 | 2012-02-01 | 北京英力和泓新材料技术有限公司 | Novel pulping process for obtaining high performance fiber at high yield from plants |
| CN106223094A (en) * | 2016-07-29 | 2016-12-14 | 云南新平南恩糖纸有限责任公司 | Mixed pulp paper technology |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117328286A (en) * | 2023-10-30 | 2024-01-02 | 华邦特西诺采新材料股份有限公司 | Bamboo pulp paper and preparation method thereof |
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Application publication date: 20200602 |