阅读说明：本技术 一种制造麦草纸浆的工艺 (Process for manufacturing wheat straw pulp ) 是由 刘洁 赵晓兵 于 2020-12-16 设计创作，主要内容包括：本发明涉及纸浆制备的技术领域,具体而言,涉及一种制造麦草纸浆的工艺。制造麦草纸浆的工艺,将稻杆打成浆,然后送至水力碎浆机稀释搅拌后用双盘磨浆机进行精磨,再送至除渣机将粗渣回收到水力碎浆机稀释搅拌后采用压力筛筛选出良浆,再将良浆送入调浆池,加入助剂,然后再送入抄前池。此工艺具有步骤简单、成本低的优点。(The invention relates to the technical field of paper pulp preparation, in particular to a process for manufacturing wheat straw paper pulp. A technology for making wheat straw pulp includes beating rice straw to become pulp, diluting and stirring in hydraulic pulper, fine grinding in dual-disc pulp grinder, removing dregs, diluting and stirring in hydraulic pulper, screening out good pulp by pressure sieve, mixing with assistant and pre-pulping. The process has the advantages of simple steps and low cost.)

1. A process for making wheat straw pulp, characterized by: beating the rice straw into pulp, then sending the pulp to a hydrapulper for dilution and stirring, then carrying out fine grinding by a double-disc pulp grinder, then sending the pulp to a slag remover for recovering coarse slag to the hydrapulper for dilution and stirring, then screening good pulp by adopting a pressure screen, sending the good pulp into a pulp mixing tank, adding an auxiliary agent, and then sending the good pulp into a pre-pulping tank.

2. The process of claim 1, wherein the wheat straw pulp is produced by: the straw is beaten into pulp by ultrasonic waves.

3. The process of manufacturing wheat straw pulp of claim 2, wherein: the straw is beaten into thick liquid through the ultrasonic wave in ultrasonic reactor, ultrasonic reactor's ultrasonic roller sends the frequency and is 25 ~ 40khz, beats the system time and is 30 ~ 60s, sends to the hydrapulper again.

4. The process of claim 1, wherein the wheat straw pulp is produced by: the beating degree of the pulp refined by the double-disc refiner is 38-45SR, the wet weight is 3-3.6g, and the whiteness is 40-48.

5. The process of claim 1, wherein the wheat straw pulp is produced by: the beating degree of the pulp after being finely ground by adopting the double-disc refiner is 39SR, the wet weight is 3.5g, and the whiteness is 40.

6. The process of claim 1, wherein the wheat straw pulp is produced by: the beating degree of the pulp refined by the double-disc refiner is 37.5SR, the wet weight is 3.3g, and the whiteness is 42.

7. The process of claim 1, wherein the wheat straw pulp is produced by: the rice straw is pulped and then sent to a hydrapulper to dilute the pulp to have the concentration of 2.9-3.2%.

8. The process of claim 1, wherein the wheat straw pulp is produced by: the auxiliary agent comprises the following components: a tension agent and a retention aid.

9. The process of claim 1, wherein the wheat straw pulp is produced by: the tension agent is 2.5-4.0%, and the retention aid is 2.0-3.5%.

10. The process of claim 1, wherein the wheat straw pulp is produced by: the auxiliary agent is cationic starch.

Technical Field

The invention relates to the technical field of paper pulp preparation, in particular to a process for manufacturing wheat straw paper pulp.

Background

In recent years, the average amount of pulp consumed per year in China is about 9X 10⁷t, the main raw materials for pulping and papermaking comprise wood fibers, non-wood fibers and secondary fibers, wherein the most important raw materials are wood fibers. The forest coverage area of China only accounts for 20 percent of the territorial area, the supply of paper making raw materials is insufficient, paper making wood pulp is mostly dependent on import, and the shortage of wood resources worldwide at presentIncreasingly, the production of pulp and paper without damaging forests and the environment is the goal sought by various paper-making enterprises. As a big agricultural country in China, the annual yield of plant straws is 7 multiplied by 10⁹t, wherein the annual yield of straw is the front, in traditional agriculture most of straw is treated by open air incineration, which is once considered as the main cause of atmospheric pollution and greenhouse effect, and its unreasonable treatment not only pollutes the environment but also wastes good resources. Therefore, effective development and utilization of rice straw are the focus of attention in various fields. And the content of cellulose in the straw is about 40%, which is very suitable for preparing paper pulp.

Disclosure of Invention

The invention aims to provide a process for manufacturing wheat straw pulp, which has the advantages of simple steps and low cost.

The technical problem to be solved by the invention is realized by adopting the following technical scheme.

The invention provides a process for preparing wheat straw pulp, which comprises pulping rice straw, then sending to a hydrapulper for dilution and stirring, then carrying out fine grinding by a double-disc refiner, then sending to a slag remover for recovering coarse slag to the hydrapulper for dilution and stirring, then screening out good pulp by a pressure screen, sending the good pulp to a pulp mixing tank, adding an auxiliary agent, and then sending to a pre-pulping tank.

Further, the straw is beaten into pulp by ultrasonic waves.

Further, the straw is beaten into pulp by ultrasonic waves in an ultrasonic reactor, an ultrasonic roller of the ultrasonic reactor emits 25-40 khz, beating time is 30-60 s, and then the pulp is sent to a hydrapulper.

Further, the beating degree of the pulp refined by the double-disc refiner is 38-45SR, the wet weight is 3-3.6g, and the whiteness is 40-48.

Further, the auxiliary agent comprises the following components: a tension agent and a retention aid.

Furthermore, the weight part of the tension agent is 2.5-4.0 parts, and the weight part of the retention aid is 2.0-3.5 parts.

Further, the auxiliary agent is cationic starch.

The process for manufacturing the wheat straw pulp provided by the embodiment of the invention at least has the following advantages or beneficial effects:

pulping the rice straws, then delivering the rice straws to a hydrapulper for dilution and stirring, and then carrying out fine grinding by using a double-disc refiner, wherein the pulp can be more uniform and thorough in the fine grinding process through dilution and stirring by the hydrapulper, so that the quality of the fine grinding of the pulp is improved; after fine grinding, sending the pulp to a slag remover, then recovering coarse slag to a hydrapulper for dilution and stirring, refining the coarse slag, and then screening good pulp by adopting a pressure screen to avoid the influence of the coarse slag on the quality of the paper pulp, thereby avoiding the condition that the paper made of the paper pulp is not fine enough; and then sending the good pulp into a pulp mixing tank, adding an auxiliary agent, and mixing the uniformity and the viscosity of the paper pulp to ensure that the paper prepared from the paper pulp has better smoothness, tension and uniformity, and finally sending the paper into a pre-papermaking tank. The process not only can overcome the destructiveness of the traditional pulping to the fiber, but also can keep the soft toughness of the grass fiber.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to specific examples.

The embodiment of the application provides a process for manufacturing wheat straw pulp, which comprises the steps of pulping rice straws, then sending the rice straws to a hydrapulper for dilution and stirring, then carrying out fine grinding by using a double-disc refiner, then sending the rice straws to a slag remover, recovering coarse slag to the hydrapulper for dilution and stirring, then screening good pulp by using a pressure screen, then sending the good pulp to a pulp mixing tank, adding an auxiliary agent, and then sending the good pulp to a pre-pulping tank.

Pulping the rice straws, then delivering the rice straws to a hydrapulper for dilution and stirring, and then carrying out fine grinding by using a double-disc refiner, wherein the pulp can be more uniform and thorough in the fine grinding process through dilution and stirring by the hydrapulper, so that the quality of the fine grinding of the pulp is improved; after fine grinding, sending the pulp to a slag remover, then recovering coarse slag to a hydrapulper for dilution and stirring, refining the coarse slag, and then screening good pulp by adopting a pressure screen to avoid the influence of the coarse slag on the quality of the paper pulp, thereby avoiding the condition that the paper made of the paper pulp is not fine enough; and then sending the good pulp into a pulp mixing tank, adding an auxiliary agent, and mixing the uniformity and the viscosity of the paper pulp to ensure that the paper prepared from the paper pulp has better smoothness, tension and uniformity, and finally sending the paper into a pre-papermaking tank. The process not only can overcome the destructiveness of the traditional pulping to the fiber, but also can keep the soft toughness of the grass fiber.

Further, the straw is beaten into pulp by ultrasonic waves. The pulp is made by adopting ultrasonic beating, the characteristics of the traditional pulping are retained, the destructiveness of the traditional pulping to the fiber is overcome, the soft toughness of the grass fiber is retained, and the pulp plays a good role in improving the physical index of the paper.

Further, the straw is beaten into pulp by ultrasonic waves in an ultrasonic reactor, an ultrasonic roller of the ultrasonic reactor emits 25-40 khz, beating time is 30-60 s, and then the pulp is sent to a hydrapulper. By adopting the frequency and the time parameters, the beaten pulp not only keeps the softness of the grass fiber, but also can not damage the fiber and keep the toughness.

Further, the beating degree of the pulp refined by the double-disc refiner is 38-45SR, the wet weight is 3-3.6g, and the whiteness is 40-48. The quality of paper made by the pulp can be effectively ensured.

Further, the auxiliary agent comprises the following components: a tension agent and a retention aid. The paper made by adopting the two auxiliary agents has strong flexibility and better softness, and is suitable for toilet paper.

Furthermore, the weight part of the tension agent is 2.5-4.0 parts, and the weight part of the retention aid is 2.0-3.5 parts. The paper pulp prepared by the preparation has strong flexibility and optimal softness.

Further, the auxiliary agent is cationic starch. The paper prepared by adopting the auxiliary agent has high strength and is suitable for preparing corrugated paper.

The features and properties of the present invention are described in further detail below with reference to examples.

Example 1

The present embodiment provides a process for manufacturing wheat straw pulp, comprising the steps of:

beating the rice straws into pulp by ultrasonic waves, beating the rice straws into the pulp in an ultrasonic reactor by the ultrasonic waves, wherein the frequency of an ultrasonic roller of the ultrasonic reactor is 25khz, the beating time is 30s, then sending the pulp into a hydrapulper, diluting and stirring the pulp in the hydrapulper, finely grinding the pulp by using a double-disc refiner, refining the pulp by using the double-disc refiner, wherein the beating degree of the refined pulp is 38SR, the wet weight is 3g, and the whiteness is 40, then sending the pulp to a slag remover, recovering coarse slag into the hydrapulper, diluting and stirring the coarse slag, then screening the good pulp by using a pressure screen, then sending the good pulp into a pulp mixing tank, adding an auxiliary agent, wherein the auxiliary agent comprises a tension agent and a retention aid, the weight part of the tension agent is 2.5, the weight part of the retention aid is 2.0, and finally sending the good pulp into a pre-pulping tank.

Example 2

The present embodiment provides a process for manufacturing wheat straw pulp, comprising the steps of:

beating the rice straws into pulp by ultrasonic waves, beating the rice straws into the pulp in an ultrasonic reactor by the ultrasonic waves, wherein the frequency of an ultrasonic roller of the ultrasonic reactor is 40khz, the beating time is 60s, sending the pulp to a hydrapulper, diluting and stirring the pulp in the hydrapulper, finely grinding the pulp by using a double-disc refiner, refining the pulp by using the double-disc refiner with the beating degree of 45SR, the wet weight of 3.6g and the whiteness of 45, sending the pulp to a slag remover, recovering coarse slag to the hydrapulper, diluting and stirring the coarse slag, screening the good pulp by using a pressure screen, sending the good pulp to a pulp mixing tank, adding an auxiliary agent, wherein the auxiliary agent comprises a tension agent and a retention aid, the weight part of the tension agent is 3.0, the weight part of the retention aid is 3.0, and finally sending the good pulp to a pre-pulping tank.

Example 3

The present embodiment provides a process for manufacturing wheat straw pulp, comprising the steps of:

beating the rice straws into pulp by ultrasonic waves, beating the rice straws into the pulp in an ultrasonic reactor by the ultrasonic waves, wherein the frequency of an ultrasonic roller of the ultrasonic reactor is 35khz, the beating time is 50s, sending the pulp to a hydrapulper, diluting and stirring the pulp in the hydrapulper, finely grinding the pulp by using a double-disc refiner, refining the pulp by using the double-disc refiner with the beating degree of 40SR, the wet weight of 3.2g and the whiteness of 46, sending the pulp to a slag remover, recovering coarse slag to the hydrapulper, diluting and stirring the coarse slag, screening the good pulp by using a pressure screen, sending the good pulp to a pulp mixing tank, adding an auxiliary agent, wherein the auxiliary agent comprises a tension agent and a retention aid, the weight part of the tension agent is 3.2, the weight part of the retention aid is 2.8, and finally sending the good pulp to a pre-pulping tank.

Example 4

The present embodiment provides a process for manufacturing wheat straw pulp, comprising the steps of:

beating the rice straws into pulp by ultrasonic waves, beating the rice straws into the pulp in an ultrasonic reactor by the ultrasonic waves, wherein the frequency of an ultrasonic roller of the ultrasonic reactor is 32khz, the beating time is 50s, sending the pulp to a hydrapulper, diluting and stirring the pulp in the hydrapulper, finely grinding the pulp by using a double-disc refiner, refining the pulp by using the double-disc refiner, wherein the beating degree of the refined pulp is 43SR, the wet weight is 3.1g, and the whiteness is 42, sending the pulp to a slag remover, recovering coarse slag to the hydrapulper, diluting and stirring the coarse slag, screening the good pulp by using a pressure screen, sending the good pulp to a pulp mixing tank, adding an auxiliary agent, wherein the auxiliary agent comprises a tension agent and a retention aid, the weight part of the tension agent is 2.9, the weight part of the retention aid is 3.1, and finally sending the good pulp to a pre-pulping tank.

Example 5

The present embodiment provides a process for manufacturing wheat straw pulp, comprising the steps of:

beating the rice straws into pulp by ultrasonic waves, beating the rice straws into the pulp in an ultrasonic reactor by the ultrasonic waves, wherein the frequency of an ultrasonic roller of the ultrasonic reactor is 32khz, the beating time is 35s, then sending the pulp to a hydrapulper, diluting and stirring the pulp in the hydrapulper, finely grinding the pulp by a double-disc refiner, refining the pulp by the double-disc refiner with a beating degree of 41SR, a wet weight of 3.3g and a whiteness of 42, sending the pulp to a slag remover, recovering coarse slag to the hydrapulper, diluting and stirring the coarse slag, then screening the good pulp by a pressure screen, sending the good pulp to a pulp mixing tank, adding an auxiliary agent, wherein the auxiliary agent comprises a tension agent and a retention aid, the weight part of the tension agent is 3.9, the weight part of the retention aid is 3.4, and finally sending the good pulp to a pre-pulping tank.

The pulp prepared in the above examples 1-2 was used to produce straw pulp plain paper using a multi-wire, multi-cylinder paper machine, and the various test data of the plain paper are shown in the following table 1:

TABLE 1

As can be seen from Table 1, the plain paper produced from the straw pulp prepared in examples 1-2 was excellent in ring crush, tightness and paper quality.

The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. 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.