阅读说明：本技术 一种树叶生物机械浆的制备工艺 (Preparation process of leaf biomechanical pulp ) 是由 王玉珑 吴学勋 于 2020-03-30 设计创作，主要内容包括：本发明公开了一种树叶生物机械浆的制备工艺,包括备料、热处理、生物处理、机械揉搓与筛选、机械磨浆等主要步骤；制得的生物机械浆,以叶脉组织为骨架结构,纸浆得率较高,浆料性能好,可用于生产瓦楞原纸、包装纸板、纸塑模具、文化纸、特种纸等。本发明利用资源丰富的树叶作为原料,结合生物处理技术制备生物机械浆,既可有效缓解我国造纸工业纤维资源紧张的难题,又能够降低环境污染。(The invention discloses a preparation process of tree leaf bio-mechanical pulp, which comprises the main steps of material preparation, heat treatment, biological treatment, mechanical kneading and screening, mechanical pulp grinding and the like; the prepared bio-mechanical pulp takes the vein tissue as a skeleton structure, has higher pulp yield and good pulp performance, and can be used for producing corrugated raw paper, packaging paper boards, paper-plastic molds, cultural paper, special paper and the like. The invention utilizes the leaves with rich resources as raw materials, combines the biological treatment technology to prepare the bio-mechanical pulp, can effectively relieve the problem of fiber resource shortage in the paper making industry of China, and can reduce the environmental pollution.)

1. A preparation process of tree leaf biomechanical pulp 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) thermal treatment

Placing the standby raw materials into a steaming bin or a reaction kettle, and performing steam heating or hot water soaking treatment at 60-140 deg.C for 15-90 min;

(3) biological treatment

Taking out the thermally treated leaf raw material in the step (2), adding biological enzyme, and carrying out biological treatment;

(4) mechanical kneading and screening

Taking out the raw materials subjected to biological treatment in the step (3), mechanically kneading the raw materials to separate mesophyll parts and veins of the leaves, and screening the mesophyll parts and the veins; after screening, controlling the weight ratio of the mesophyll content in the raw materials to be lower than 40 percent;

(5) mechanical pulp grinding

Taking out the raw materials in the step (4), and performing two or more sections of mechanical pulping to obtain the leaf biomechanical pulp, wherein the pulping concentration is 10-35%, the disc grinding gap is 0.1-1.2 mm, and the pulping degree is 10-55 SR.

2. The process for preparing a bio-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 process for preparing a bio-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 process for preparing a bio-mechanical pulp of leaves as claimed in claim 2, wherein: the broad-leaved tree leaves are dry leaves, wet leaves or dry and wet mixed leaves.

5. The process for preparing the bio-mechanical pulp of the tree leaves as claimed in claim 1, wherein the bio-enzyme in the step (3) is neutral complex enzyme, which is prepared by compounding three enzymes of neutral pectinase, neutral xylanase and neutral cellulase, and the total dosage is 60-200 IU/m L, wherein the enzyme activity ratio of the neutral pectinase, the neutral xylanase and the neutral cellulase is (2-5): 1-3): 0.5-1.5.

6. The process for preparing a bio-mechanical pulp of leaves as claimed in claim 1, wherein: the process conditions of the biological treatment in the step (3) are as follows: the temperature is 20-65 deg.C, pH is 6.0-8.0, and the treatment time is 45-120 min.

7. The process for preparing a bio-mechanical pulp of leaves as claimed in claim 1, wherein: the prepared leaf bio-mechanical pulp can be used for producing corrugated base paper, packaging paper boards, paper-plastic molds, cultural paper, special paper and the like by paper making.

Technical Field

The invention relates to a preparation process for preparing bio-mechanical pulp by taking leaves as raw materials, belonging to the field of papermaking technology and new materials.

Background

The paper making industry is an important basic raw material industry of national economy, and according to statistics, the production quantity of Chinese paper and paperboard in 2018 is 10435 ten thousand tons (the world is the first place), the consumed paper pulp is 9387 ten thousand tons, wherein 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 healthy and 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 of solid wastes by forbidding foreign garbage, the document is stipulated to 2020, and China forbids the import of 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 is imperative to solve the problem of raw material shortage in the papermaking industry in China.

The non-wood fiber raw material used for pulping and papermaking is a great characteristic of the papermaking industry in China, and the problem of raw material shortage of 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 leaves can be used as raw materials to produce paper pulp, paper making and related industries can obtain raw material sources with rich resources, thereby improving the current raw material shortage dilemma.

In the traditional pulping and papermaking production process, because a large amount of chemicals and high-energy-consumption equipment are widely used, the environmental problem is serious day by day, and the problem of excessive energy consumption is prominent. The pulping method of biological mechanical method is that the plant fiber raw material is pretreated by enzyme or microbe to degrade or soften lignin and hemicellulose in the raw material, and then the pulp is dissociated into pulp by mechanical pulp grinding treatment. The biological mechanical pulping technology is beneficial to reducing the chemical pollution generated in the pulping process and reducing the pulping energy consumption, and has good application prospect.

Disclosure of Invention

The invention aims to provide a preparation process for preparing the bio-mechanical pulp by taking leaves as raw materials, which can change waste into valuable and provide a new material for papermaking and related industries.

The technical scheme adopted by the invention is as follows: a preparation process of tree leaf biomechanical pulp 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) thermal treatment

Placing the standby raw materials into a steaming bin or a reaction kettle, and performing steam heating or hot water soaking treatment at 60-140 deg.C for 15-90 min;

(3) biological treatment

Taking out the thermally treated leaf raw material in the step (2), adding biological enzyme, and carrying out biological treatment;

(4) mechanical kneading and screening

Taking out the raw materials subjected to biological treatment in the step (3), mechanically kneading the raw materials to separate mesophyll parts and veins of the leaves, and screening the mesophyll parts and the veins; after screening, controlling the weight ratio of the mesophyll content in the raw materials to be lower than 40 percent;

(5) mechanical pulp grinding

Taking out the raw materials in the step (4), and performing two or more sections of mechanical pulping to obtain the leaf biomechanical pulp, wherein the pulping concentration is 10-35%, the disc grinding gap is 0.1-1.2 mm, and the pulping degree is 10-55 SR.

The leaves in the step (1) are one or a mixture of several of broadleaf tree leaves, such as poplar leaves, phoenix tree leaves, magnolia leaves, linden leaves, loquat leaves, camphor tree leaves and the like.

The leaves in the step (1) can be broadleaf dry leaves, wet leaves or dry-wet mixed leaves.

The biological enzyme in the step (3) is neutral complex enzyme which is prepared by compounding neutral pectinase, neutral xylanase and neutral cellulase, and the total dosage is 60-200 IU/m L, wherein the enzyme activity ratio of the neutral pectinase, the neutral xylanase and the neutral cellulase is (2-5): 1-3): 0.5-1.5.

The biological treatment process in the step (3) comprises the following steps: the temperature is 20-65 deg.C, pH is 6.0-8.0, and the treatment time is 45-120 min.

The leaf bio-mechanical pulp prepared by the preparation process can be used for producing corrugated raw paper, packaging paper boards, paper-plastic molds, cultural paper, special paper and the like by paper making.

The invention has the following advantages:

(1) the method for producing the bio-mechanical pulp by using the broad-leaved tree leaves with rich resources as the raw materials can effectively relieve the problem of fiber resource shortage in the papermaking industry in China, reduce the wood resource consumption and protect the ecological environment.

(2) In the preparation process, biological enzyme is adopted to treat raw materials, no chemical is used, no chemical pollution is caused, and the environmental benefit is good; and the energy consumption of mechanical pulping can be obviously reduced.

(3) The bio-mechanical pulp prepared by the invention takes the vein structure as the framework structure, has higher pulp yield and good pulp performance, and can be used for producing corrugated raw paper, packaging paper boards, paper-plastic molds, cultural paper, special paper and the like by matching and making.

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.