CN111335057A - Preparation method of chemical mechanical pulp for leaves - Google Patents
Preparation method of chemical mechanical pulp for leaves Download PDFInfo
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- CN111335057A CN111335057A CN202010236597.5A CN202010236597A CN111335057A CN 111335057 A CN111335057 A CN 111335057A CN 202010236597 A CN202010236597 A CN 202010236597A CN 111335057 A CN111335057 A CN 111335057A
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- leaves
- paper
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- pulp
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/02—Pretreatment of the raw materials by chemical or physical means
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
- D21D1/30—Disc mills
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
The invention discloses a preparation method of chemical mechanical pulp of leaves, which comprises the main steps of material preparation, chemical treatment, mechanical kneading and screening, mechanical pulp grinding and the like; the prepared chemical mechanical pulp for leaves takes leaf vein tissues as a framework structure, has high paper pulp yield and good pulp performance, and can be used for producing corrugated raw paper, packaging paper boards, paper-plastic molds, cultural paper and the like by matching. The invention utilizes the broad-leaved tree leaves with rich resources as raw materials to produce the paper pulp, which not only can effectively relieve the problem of fiber resource shortage in the paper industry of China, but also can reduce the resource consumption of pulping and paper-making wood and protect the natural environment. The method has the advantages of simple process flow, strong operability, low production cost and easy large-scale industrialization.
Description
Technical Field
The invention relates to a method for preparing chemi-mechanical pulp by taking leaves as raw materials, belonging to the field of papermaking technology and new materials.
Background
The paper industry is an important basic raw material industry of national economy, and China is the first country for producing paper and paperboard in the world. According to statistics, the production amount of the Chinese paper and the paperboard in 2018 is 10435 ten thousand tons, the consumption amount of the paper pulp is 9387 ten thousand tons, the wood pulp is 3303 ten thousand tons, and the waste paper pulp is 5474 ten thousand tons. The forest coverage rate of China is low, wood fiber resources are deficient, the quality of domestic waste paper is poor, wood pulp and waste paper for papermaking are greatly dependent on import for a long time, and the benign development of the papermaking industry is severely restricted. In 2017, in 4 months, the center issues a scheme for improving the system for promoting the import management of the solid wastes about banning foreign wastes, and documents are put forward to 2020, and China forbids importing waste paper comprehensively, so that the problem of raw material shortage in the paper making industry is more prominent. The development of novel papermaking raw materials can relieve the problem of raw material shortage of the papermaking industry in China, and the method has very important significance for the healthy development of the papermaking industry. The use of non-wood fiber raw materials for pulping and papermaking is a great characteristic of the papermaking industry in China, the consumption of non-wood pulp in China in 2018 reaches 610 ten thousand tons, and the consumption accounts for 7 percent of the total consumption of paper pulp, so that the problem of raw material shortage in the papermaking industry in China is relieved to a certain extent. At present, the commonly used non-wood pulp in China comprises bamboo pulp, reed pulp, wheat straw pulp, rice straw pulp, bagasse pulp and the like, the source channel of the non-wood fiber is continuously widened, and the development of the papermaking industry is assisted, so that the non-wood pulp has very important significance.
The leaves are the photosynthesis parts of trees and mainly comprise veins and mesophyll, the veins are mainly vascular bundle structures and are composed of a large amount of cellulose, and the mesophyll is mainly composed of palisade tissues, spongy tissues and other parenchyma cells and a large amount of chloroplast. The source of the leaves is very rich, and especially, the leaves of the broadleaf plants contain more vein tissues. If the broad-leaved tree leaves with rich resources can be reasonably utilized as the papermaking raw materials to produce the paper pulp, the waste can be changed into valuable, the comprehensive utilization of the leaves can be realized, the valuable raw materials can be provided for papermaking and related industries, and the healthy development of the industries can be promoted.
Disclosure of Invention
The invention aims to provide a preparation method for preparing chemi-mechanical pulp by taking leaves as raw materials, which can change waste into valuable, realize the comprehensive utilization of the leaves and provide a new raw material for papermaking and related industries.
The technical scheme adopted by the invention is as follows: a preparation method of chemical mechanical pulp of leaves is characterized in that: the method comprises the following steps:
(1) stock preparation
Dedusting the collected leaf raw materials, and cutting into small pieces with the length and width of 2-4 cm for later use;
(2) chemical treatment
Putting the standby raw materials into a reaction kettle, adding chemicals to corrode the leaves, and destroying mesophyll tissues and the connection between the mesophyll and veins;
(3) mechanical kneading and screening
Taking out the raw materials in the step (2), filtering, washing, mechanically kneading to separate mesophyll parts from veins of the leaves, and screening;
(4) mechanical pulp grinding
Taking out the raw materials in the step (3), and performing two-stage or more than two-stage mechanical pulping treatment to obtain the chemi-mechanical pulp of the leaves, wherein the pulping concentration is 10-35%, the disc grinding gap is 0.2-1.5 mm, and the pulping degree of the finished pulp is 10-55 SR.
The leaves in the step (1) are one or a mixture of several of broad-leaved tree leaves, such as poplar leaves, phoenix tree leaves, magnolia leaves, linden leaves, loquat leaves, camphor tree leaves and the like.
The broad-leaved tree leaves in the step (1) can be dry leaves, wet leaves or dry and wet mixed leaves.
The chemical treatment in step (2) may be one or more of alkaline chemicals such as sodium hydroxide, potassium hydroxide, sodium bicarbonate, sodium carbonate, etc., or other corrosive chemicals.
And (4) after screening in the step (3), controlling the mesophyll content to be lower than 40% of the weight ratio of the raw materials.
The chemical mechanical pulp prepared by the preparation method can be used for preparing corrugated raw paper, packaging paper boards, paper-plastic molds, cultural paper and the like.
The invention has the following advantages:
(1) the paper pulp is produced by using the leaves with rich resources as raw materials, so that the comprehensive utilization of the leaves can be realized, the problem of fiber resource shortage in the paper making industry in China is effectively relieved, the consumption of pulping and paper making wood resources can be reduced, and the natural environment is protected.
(2) The prepared chemical mechanical pulp for leaves takes leaf vein tissues as a framework structure, has high paper pulp yield and good pulp performance, and can be used for producing corrugated raw paper, packaging paper boards, paper-plastic molds, cultural paper and the like by matching.
(3) The method has the advantages of simple process flow, strong operability, low production cost and easy large-scale industrialization.
Detailed Description
The present invention is further described below in conjunction with examples, which are to be understood as being illustrative only and in no way limiting.
Example 1:
selecting poplar leaves as raw materials, cleaning, removing dust, and cutting into small pieces with the length and width of 2-4 cm for later use. Placing the standby raw materials into a reaction kettle, adding 8% sodium hydroxide aqueous solution, controlling the solid-to-liquid ratio to be 1:5, heating to 90 ℃, and treating for 60 minutes. Taking out the alkali-treated raw materials, filtering, washing, kneading and extruding by using a kneading machine to separate mesophyll from veins, and screening; after screening, controlling the mesophyll content to be less than 40% of the weight ratio of the raw materials. Adjusting the concentration of the screened raw materials to 25%, and performing two-stage pulping treatment by using a high-concentration pulping machine, wherein the disc-grinding clearance is controlled to be 0.8-1.0 mm in the first stage, the disc-grinding clearance is controlled to be 0.25-0.3 mm in the second stage, and the pulping degree of the ground pulp is controlled to be 45-55 SR.
The pulp obtained in the embodiment can be used for making corrugated raw paper, packaging paper boards and the like after washing, screening, purifying and pulping.
Example 2:
cleaning and dedusting Magnolia denudata leaf and Firmiana simplex leaf respectively, cutting into pieces with length and width of 2-4 cm, and mixing at a weight ratio of 60:40 (dry weight). Placing the standby raw materials into a reaction kettle, adding a 10% sodium hydroxide and sodium carbonate mixed aqueous solution (solute mass ratio is 1: 1), controlling the solid-to-liquid ratio to be 1:4, heating to 85 ℃, and treating for 90 minutes. Taking out the treated raw materials, filtering, washing, kneading and extruding by using a kneading machine to separate mesophyll from veins, and screening; after screening, controlling the mesophyll content to be less than 25% of the weight ratio of the raw materials. Adjusting the concentration of the screened raw materials to 20%, and performing two-stage pulping treatment by using a high-concentration pulping machine, wherein the disc-grinding clearance is controlled to be 0.6-0.8 mm in the first stage, the disc-grinding clearance is controlled to be 0.3-0.4 mm in the second stage, and the pulping degree of the ground pulp is controlled to be 40-50 SR.
The pulp obtained in the embodiment can be used for making corrugated medium paper, paper-plastic molds and the like after washing, screening, purifying and pulping.
Example 3:
selecting linden leaves as raw materials, cleaning, removing dust, and cutting into pieces with length and width of 2-4 cm for use. Placing the standby raw materials into a reaction kettle, adding a mixed aqueous solution of sodium hydroxide and sodium bicarbonate with the concentration of 15% (solute ratio is 2:1), controlling the solid-to-liquid ratio to be 1:4.5, heating to 90 ℃, and treating for 120 minutes. Taking out the treated raw materials, filtering, washing, kneading and extruding by using a kneading machine to separate mesophyll from veins, and screening; after screening, controlling the mesophyll content to be less than 10% of the weight ratio of the raw materials. Adjusting the concentration of the screened raw materials to 15%, and performing two-stage pulping treatment by using a high-concentration pulping machine, wherein the disc-grinding clearance is controlled to be 0.5-0.6 mm in the first stage, the disc-grinding clearance is controlled to be 0.2-0.3 mm in the second stage, and the pulping degree of the ground pulp is controlled to be 35-40 SR.
The pulp obtained in the embodiment can be used for preparing packaging paper boards, paper-plastic molds and the like after washing, screening, purifying and pulping.
Example 4:
cleaning and dedusting linden leaf and camphor tree leaf respectively, cutting into pieces with length and width of 2-4 cm, and mixing at a weight ratio of 50:50 (absolute dry weight) for later use. Placing the standby raw materials into a reaction kettle, adding a 15% potassium hydroxide aqueous solution, controlling the solid-to-liquid ratio of cooking to be 1:5, heating to 120 ℃, and treating for 90 minutes. Taking out the treated raw materials, filtering, washing, kneading and extruding by using a kneading machine to separate mesophyll from veins, and screening; after screening, controlling the weight ratio of the mesophyll content in the raw materials to be less than 0.5%. Adjusting the concentration of the screened raw materials to 28%, and performing three-stage pulping treatment by using a high-concentration pulping machine, wherein the disc grinding clearance of the first stage is controlled to be 1.0-1.2 mm, the disc grinding clearance of the second stage is controlled to be 0.7-0.8 mm, the disc grinding clearance of the third stage is controlled to be 0.2-0.3 mm, and the pulping degree of the ground pulp is controlled to be 35-45 SR.
The pulp obtained in the embodiment can be used for preparing packaging paperboards, paper-plastic molds, cultural papers and the like after washing, screening, purifying and pulping.
Claims (7)
1. A preparation method of chemical mechanical pulp of leaves is characterized by comprising the following steps:
(1) stock preparation
Dedusting the collected leaf raw materials, and cutting into small pieces with the length and width of 2-4 cm for later use;
(2) chemical treatment
Putting the standby raw materials into a reaction kettle, adding chemicals to corrode the leaves, and destroying mesophyll tissues and the connection between the mesophyll and veins;
(3) mechanical kneading and screening
Taking out the raw materials in the step (2), filtering, washing, mechanically kneading to separate mesophyll parts from veins of the leaves, and screening;
(4) mechanical pulp grinding
Taking out the raw materials in the step (3), and performing two-stage or more than two-stage mechanical pulping treatment to obtain the chemi-mechanical pulp of the leaves, wherein the pulping concentration is 10-35%, the disc grinding gap is 0.2-1.5 mm, and the pulping degree is 10-55 SR.
2. The method for preparing the chemical mechanical pulp of leaves as claimed in claim 1, wherein: the leaves in the step (1) are one or a mixture of several of broad-leaved wood leaves.
3. The method for preparing the chemical mechanical pulp of leaves as claimed in claim 2, wherein: the broad-leaved tree leaf is poplar leaf, phoenix tree leaf, magnolia leaf, linden leaf, loquat leaf, camphor tree leaf.
4. The method for preparing the chemical mechanical pulp of leaves as claimed in claim 2, wherein: the broad-leaved tree leaves are broad-leaved tree dry leaves, wet leaves or dry-wet mixed leaves.
5. The method for preparing the chemical mechanical pulp of leaves as claimed in claim 1, wherein: the chemical treatment in the step (2) adopts one or more of alkaline chemicals such as sodium hydroxide, potassium hydroxide, sodium bicarbonate, sodium carbonate and the like.
6. The method for preparing the chemical mechanical pulp of leaves as claimed in claim 1, wherein: and (4) after screening in the step (3), controlling the mesophyll content to be lower than 40% of the weight ratio of the raw materials.
7. The method for preparing the chemical mechanical pulp of leaves as claimed in claim 1, wherein: the prepared chemical mechanical pulp of leaves is used for preparing corrugated base paper, packaging paper boards, paper-plastic molds and cultural paper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010236597.5A CN111335057A (en) | 2020-03-30 | 2020-03-30 | Preparation method of chemical mechanical pulp for leaves |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010236597.5A CN111335057A (en) | 2020-03-30 | 2020-03-30 | Preparation method of chemical mechanical pulp for leaves |
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| CN111335057A true CN111335057A (en) | 2020-06-26 |
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| CN202010236597.5A Pending CN111335057A (en) | 2020-03-30 | 2020-03-30 | Preparation method of chemical mechanical pulp for leaves |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114182552A (en) * | 2021-11-26 | 2022-03-15 | 上海翔港包装科技股份有限公司 | Processing method of renewable environment-friendly paper |
Citations (9)
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|---|---|---|---|---|
| DE3839499A1 (en) * | 1988-11-23 | 1990-05-31 | Kahl Amandus Maschf | Device (tub-grinder) and method for breaking up cellulose-containing materials |
| CN1478378A (en) * | 2002-08-30 | 2004-03-03 | 张海龙 | Method for separating leaf renae from mesophyll of eucommia leaves |
| CN101555668A (en) * | 2009-05-19 | 2009-10-14 | 黄润燕 | Paper making method taking canes, leaves and fruit stems of banana tree as raw materials |
| CN102943409A (en) * | 2012-11-14 | 2013-02-27 | 常州亚当生物技术有限公司 | Method for making paper by utilizing aquilaria sinensis branches and leaves |
| CN103074788A (en) * | 2012-12-26 | 2013-05-01 | 李明贵 | Subzero treatment preparation method of leave paper |
| CN103074789A (en) * | 2012-12-26 | 2013-05-01 | 李明贵 | Heat treatment preparation method of leave paper |
| KR20140104871A (en) * | 2013-02-21 | 2014-08-29 | 황성환 | The manufacturing method street tree fallen leave (platanus) in use raw material paper |
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-
2020
- 2020-03-30 CN CN202010236597.5A patent/CN111335057A/en active Pending
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| DE3839499A1 (en) * | 1988-11-23 | 1990-05-31 | Kahl Amandus Maschf | Device (tub-grinder) and method for breaking up cellulose-containing materials |
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| CN101555668A (en) * | 2009-05-19 | 2009-10-14 | 黄润燕 | Paper making method taking canes, leaves and fruit stems of banana tree as raw materials |
| CN102943409A (en) * | 2012-11-14 | 2013-02-27 | 常州亚当生物技术有限公司 | Method for making paper by utilizing aquilaria sinensis branches and leaves |
| CN103074788A (en) * | 2012-12-26 | 2013-05-01 | 李明贵 | Subzero treatment preparation method of leave paper |
| CN103074789A (en) * | 2012-12-26 | 2013-05-01 | 李明贵 | Heat treatment preparation method of leave paper |
| KR20140104871A (en) * | 2013-02-21 | 2014-08-29 | 황성환 | The manufacturing method street tree fallen leave (platanus) in use raw material paper |
| CN109056423A (en) * | 2018-08-10 | 2018-12-21 | 中山市茂林绿叶生物科技有限公司 | A kind of paper wood |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114182552A (en) * | 2021-11-26 | 2022-03-15 | 上海翔港包装科技股份有限公司 | Processing method of renewable environment-friendly paper |
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Application publication date: 20200626 |
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