阅读说明：本技术 废纸纤维微纤化处理工艺 (Waste paper fiber microfibrillar treatment process ) 是由 李文斌 陈满 于 2021-07-30 设计创作，主要内容包括：本发明属于废纸纤维微纤化处理领域,尤其是一种废纸纤维微纤化处理工艺,针对现有的微纤化纤维素的制备过程复杂,且能耗高,市场利用率还不高的问题,现提出如下方案,其包括以下步骤：S1、首先对进行微纤化用的废纸纤维种类进行研究,确定废纸纤维类型；S2、向废纸纤维加入水、纤维素酶、碱和润胀剂,搅拌均匀,得到浆料；S3、将浆料加入加料斗,加料斗上的电磁阀打开,使浆料进入两段磨浆机；S4、对浆料的添加速度进行监测,通过电磁阀开闭大小,本发明采用两段机械磨浆工艺对分级后的废纸纤维进行微纤化处理,依靠盘磨机磨盘特性以及磨盘间隙精确控制纤维微纤化程度,同时调整长纤维磨浆工艺,降低长纤维磨浆能耗。(The invention belongs to the field of waste paper fiber microfibrillation treatment, in particular to a waste paper fiber microfibrillation treatment process, which aims at solving the problems of complex preparation process, high energy consumption and low market utilization rate of the existing microfibrillated cellulose and provides the following scheme, comprising the following steps: s1, firstly, researching the type of waste paper fiber for microfibrillation and determining the type of the waste paper fiber; s2, adding water, cellulase, alkali and swelling agent into the waste paper fibers, and uniformly stirring to obtain slurry; s3, adding the pulp into a hopper, and opening an electromagnetic valve on the hopper to enable the pulp to enter a two-stage pulping machine; s4, monitoring the adding speed of the pulp, and opening and closing the size of an electromagnetic valve, the invention adopts a two-stage mechanical pulp grinding process to carry out microfibrillation treatment on the classified waste paper fiber, accurately controls the microfibrillation degree of the fiber according to the characteristics of a grinding disc of a disc grinder and the clearance of the grinding disc, and simultaneously adjusts the long fiber pulp grinding process to reduce the energy consumption of the long fiber pulp grinding.)

1. The waste paper fiber microfibrillation treatment process is characterized by comprising the following steps of:

s1, firstly, researching the type of waste paper fiber for microfibrillation and determining the type of the waste paper fiber;

s2, adding water, cellulase, alkali and swelling agent into the waste paper fibers, and uniformly stirring to obtain slurry;

s3, adding the pulp into a hopper, and opening an electromagnetic valve on the hopper to enable the pulp to enter a two-stage pulping machine;

s4, monitoring the adding speed of the slurry, and adjusting the adding speed of the slurry through the opening and closing of an electromagnetic valve;

s5, selecting the size of the grinding disc of the pulping machine according to the type of the waste paper fibers and the degree of microfibrillation, and adjusting the gap between the grinding discs;

and S6, finally, mechanically processing the fibers by a refiner.

2. The waste paper fiber microfibrillation process according to claim 1, wherein in S5, an adjustment distance is input, the adjustment mechanism adjusts the gap between two segments of refiner plates according to the received data, after the adjustment is completed, a distance meter is used to measure the gap between the plates, the measured data is compared with the input adjustment distance, and an alarm is given when an error occurs in the comparison.

3. The process of claim 1, wherein in step S6, the concentration of the pulp after being processed by the refiner is detected by a concentration detector, the detected data is transmitted to a control center, the comparison with the preset concentration of the control center is carried out, and an alarm is given when an error occurs in the comparison, wherein the preset concentration is 5-15%.

4. The waste paper fiber microfibrillation process of claim 1, wherein the waste paper fiber species comprises a mixture of long fibers, short fibers and long and short fibers.

5. The process of claim 1, wherein in step S2, water is added to the waste paper fibers, the mixture is stirred and mixed for 60-80min to obtain waste paper pulp, alkali is added to the waste paper pulp to adjust the pH to 8-10, and then swelling agent is added, and the mixture is stirred and mixed for 60-80min to soften the fibers.

6. The process of claim 1, wherein in step S3, a stirring mechanism is provided in the hopper, and when the slurry enters the hopper, the stirring mechanism is activated to stir the slurry.

7. The process of claim 1, wherein in step S3, the slurry is fed into the hopper, the solenoid valve on the hopper is opened to feed the slurry into the two-stage refiner, after the slurry is fed, the solenoid valve is closed, the blow-off valve is opened, the hopper is flushed by the water gun, and the sewage is discharged by the blow-off pipe.

8. The waste paper fiber microfibrillation process of claim 1, wherein in S2, water is added to the waste paper fiber, and the amount of water added is monitored by a flow sensor.

Technical Field

The invention relates to the technical field of waste paper fiber microfibrillation treatment, in particular to a waste paper fiber microfibrillation treatment process.

Background

The prior raw material structure of the papermaking industry in China takes waste paper raw materials as main components, and the percentage of the waste paper raw materials in recent two years reaches about 58%. The waste paper is also called as secondary fiber, and the recycled secondary fiber is used as a papermaking raw material, so that the use amount of a large amount of wood can be reduced, and the environment-friendly effect is facilitated. Generally, 1t of high-quality waste paper can be used for making paper by about 800kg, 2-3 t of wood can be saved, 1000kWh of electricity is saved, and 50m3 of water is saved. The pulping and papermaking of waste paper is typical of the development of circular economy in China. Compared with forest and non-wood raw materials, the waste paper is used as a papermaking raw material, and a series of process procedures such as material preparation, cooking, bleaching and the like are not needed, so that huge cost required in the production process is saved, energy consumption is greatly reduced, and pollutant discharge amount is reduced.

With the repeated and repeated use of the waste paper fiber, the mechanical property of the paper pulp fiber is gradually deteriorated, so that the packaging paper board manufactured by the paper is incapable of meeting the production and use requirements. In this case, simple and economical enzyme-hydrolyzed starch is widely used as an internal pulp and surface enhancer and is a standard on the production line of cardboard paper enterprises. In the production process, starch is gradually dissolved and enters water, and is continuously accumulated in a pulping and papermaking system, so that the water filtration performance of the pulp is greatly reduced, the viscosity of the pulp filtrate is increased, the growth of microorganisms is caused, the environment of papermaking production is seriously affected, the quality of finished paper is reduced to a certain degree, and the wastewater treatment load is increased.

In order to improve the paper quality of waste paper papermaking and reduce the use amount of starch, a new degradable substance needs to be developed to replace the starch. Microfibrillated cellulose is a novel cellulose product newly developed in 20 actual 80 s, and can be used as an internal sizing agent and a surface sizing agent for papermaking and the like due to the characteristics of high water retention value, high viscosity, high dispersibility, high stability and the like. But the preparation process of the microfibrillated cellulose is complex, the energy consumption is high, and the market utilization rate is not high.

Disclosure of Invention

The invention aims to solve the defects of complex preparation process, high energy consumption and low market utilization rate of the microfibrillated cellulose in the prior art, and provides a waste paper fiber microfibrillated treatment process.

In order to achieve the purpose, the invention adopts the following technical scheme:

the waste paper fiber microfibrillation treatment process comprises the following steps:

s1, firstly, researching the type of waste paper fiber for microfibrillation and determining the type of the waste paper fiber;

s2, adding water, cellulase, alkali and swelling agent into the waste paper fibers, and uniformly stirring to obtain slurry;

s3, adding the pulp into a hopper, and opening an electromagnetic valve on the hopper to enable the pulp to enter a two-stage pulping machine;

s4, monitoring the adding speed of the slurry, and adjusting the adding speed of the slurry through the opening and closing of an electromagnetic valve;

s5, selecting the size of the grinding disc of the pulping machine according to the type of the waste paper fibers and the degree of microfibrillation, and adjusting the gap between the grinding discs;

and S6, finally, mechanically processing the fibers by a refiner.

Preferably, in S5, the adjustment distance is input, the adjustment mechanism adjusts the gap between the two segments of refiner plates according to the received data, the distance meter is used to measure the gap between the refiner plates after the adjustment is completed, the measured data is compared with the input adjustment distance, and an alarm is given when an error occurs in the comparison.

Preferably, in S6, the concentration of the pulp processed by the refiner is detected by a concentration detector, the detected data is transmitted to a control center, the detected data is compared with the preset concentration of the control center, and an alarm is given when an error occurs in the comparison, wherein the preset concentration is 5-15%.

Preferably, the waste paper fiber category includes long fibers, short fibers and mixed fibers of long and short fibers.

Preferably, in S2, water is added to the waste paper fibers, the mixture is stirred and mixed for reaction for 60-80min to obtain waste paper pulp, alkali is added to the waste paper pulp, the pH is adjusted to 8-10, then swelling agent is added, the mixture is stirred and mixed for 60-80min, and the fibers are softened.

Preferably, in S3, a stirring mechanism is provided in the hopper, and when the slurry enters the hopper, the stirring mechanism is started to stir the slurry.

Preferably, in S3, add the loading hopper with thick liquids, the solenoid valve on the loading hopper is opened, makes thick liquids get into two sections fiberizers, and after thick liquids add and finish, the solenoid valve is closed, and the blowoff valve is opened, washes in the loading hopper through the squirt, and sewage is discharged by the blow off pipe.

Preferably, in S2, water is added to the waste fiber, and the amount of the added water is monitored by a flow sensor.

Compared with the prior art, the invention has the beneficial effects that:

the waste paper fiber after grading is subjected to microfibrillation treatment by adopting a two-stage mechanical pulping process, the microfibrillation degree of the fiber is accurately controlled by depending on the characteristics of a millstone of a disc mill and the gap of the millstone, and meanwhile, the long fiber pulping process is adjusted, so that the energy consumption of long fiber pulping is reduced;

the microfibrillated waste paper fiber is used for replacing a waste paper raw material or starch in pulp in the papermaking process of the cardboard paper, so that the finished paper quality is improved, the system cleanliness is improved, and the white water treatment load is reduced on the premise of not increasing the energy consumption.

Drawings

FIG. 1 is a flow chart of a waste paper fiber microfibrillation treatment process provided by the 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.

Example one

Referring to fig. 1, the process for microfibrillating waste paper fibers comprises the following steps:

s1, firstly, researching the type of waste paper fiber for microfibrillation and determining the type of the waste paper fiber;

s2, adding water, cellulase, alkali and swelling agent into the waste paper fibers, and uniformly stirring to obtain slurry;

s3, adding the pulp into a hopper, and opening an electromagnetic valve on the hopper to enable the pulp to enter a two-stage pulping machine;

s4, monitoring the adding speed of the slurry, and adjusting the adding speed of the slurry through the opening and closing of an electromagnetic valve;

s5, selecting the size of the grinding disc of the pulping machine according to the type of the waste paper fibers and the degree of microfibrillation, and adjusting the gap between the grinding discs;

and S6, finally, mechanically processing the fibers by a refiner.

In this embodiment, in S5, the adjustment distance is input, the adjustment mechanism adjusts the gap between the two segments of refiner plates according to the received data, the distance meter is used to measure the gap between the plates after the adjustment is completed, the measured data is compared with the input adjustment distance, and an alarm is given when an error occurs in the comparison.

In this embodiment, in S6, the concentration of the pulp processed by the refiner is detected by a concentration detector, the detected data is transmitted to the control center, the detected data is compared with the preset concentration of the control center, an alarm is given when an error occurs in the comparison, and the preset concentration is 5%.

In this embodiment, the waste paper fiber includes long fibers, short fibers, and a mixture of long and short fibers.

In this example, in S2, water was added to the waste paper fibers, and the mixture was stirred and mixed thoroughly for 60min to obtain waste paper pulp, and then alkali was added to the waste paper pulp to adjust the pH to 8, and then swelling agent was added, and the mixture was stirred and mixed for 60min to soften the fibers.

In this embodiment, in S3, a stirring mechanism is provided in the hopper, and when slurry enters the hopper, the stirring mechanism is started to stir the slurry.

In this embodiment, in S3, add the loading hopper with thick liquids, the solenoid valve on the loading hopper is opened, makes thick liquids get into two sections fiberizers, and after thick liquids add and finish, the solenoid valve is closed, and the blowoff valve is opened, washes in to the loading hopper through the squirt, and sewage is discharged by the blow off pipe.

In this embodiment, in S2, water is added to the used paper fibers, and the amount of water added is monitored by a flow sensor.

Example two

Referring to fig. 1, the process for microfibrillating waste paper fibers comprises the following steps:

s1, firstly, researching the type of waste paper fiber for microfibrillation and determining the type of the waste paper fiber;

s2, adding water, cellulase, alkali and swelling agent into the waste paper fibers, and uniformly stirring to obtain slurry;

s3, adding the pulp into a hopper, and opening an electromagnetic valve on the hopper to enable the pulp to enter a two-stage pulping machine;

s4, monitoring the adding speed of the slurry, and adjusting the adding speed of the slurry through the opening and closing of an electromagnetic valve;

s5, selecting the size of the grinding disc of the pulping machine according to the type of the waste paper fibers and the degree of microfibrillation, and adjusting the gap between the grinding discs;

and S6, finally, mechanically processing the fibers by a refiner.

In this embodiment, in S5, the adjustment distance is input, the adjustment mechanism adjusts the gap between the two segments of refiner plates according to the received data, the distance meter is used to measure the gap between the plates after the adjustment is completed, the measured data is compared with the input adjustment distance, and an alarm is given when an error occurs in the comparison.

In this embodiment, in S6, the concentration of the pulp processed by the refiner is detected by a concentration detector, the detected data is transmitted to the control center, the detected data is compared with the preset concentration of the control center, an alarm is given when an error occurs in the comparison, and the preset concentration is 7%.

In this embodiment, the waste paper fiber includes long fibers, short fibers, and a mixture of long and short fibers.

In this example, in S2, water was added to the waste paper fibers, and the mixture was stirred and mixed thoroughly for 65min to obtain waste paper pulp, alkali was added to the waste paper pulp to adjust the pH to 90, and then swelling agent was added, and the mixture was stirred and mixed for 65min to soften the fibers.

In this embodiment, in S3, a stirring mechanism is provided in the hopper, and when slurry enters the hopper, the stirring mechanism is started to stir the slurry.

In this embodiment, in S3, add the loading hopper with thick liquids, the solenoid valve on the loading hopper is opened, makes thick liquids get into two sections fiberizers, and after thick liquids add and finish, the solenoid valve is closed, and the blowoff valve is opened, washes in to the loading hopper through the squirt, and sewage is discharged by the blow off pipe.

In this embodiment, in S2, water is added to the used paper fibers, and the amount of water added is monitored by a flow sensor.

EXAMPLE III

Referring to fig. 1, the process for microfibrillating waste paper fibers comprises the following steps:

s1, firstly, researching the type of waste paper fiber for microfibrillation and determining the type of the waste paper fiber;

s2, adding water, cellulase, alkali and swelling agent into the waste paper fibers, and uniformly stirring to obtain slurry;

s3, adding the pulp into a hopper, and opening an electromagnetic valve on the hopper to enable the pulp to enter a two-stage pulping machine;

s4, monitoring the adding speed of the slurry, and adjusting the adding speed of the slurry through the opening and closing of an electromagnetic valve;

s5, selecting the size of the grinding disc of the pulping machine according to the type of the waste paper fibers and the degree of microfibrillation, and adjusting the gap between the grinding discs;

and S6, finally, mechanically processing the fibers by a refiner.

In this embodiment, in S5, the adjustment distance is input, the adjustment mechanism adjusts the gap between the two segments of refiner plates according to the received data, the distance meter is used to measure the gap between the plates after the adjustment is completed, the measured data is compared with the input adjustment distance, and an alarm is given when an error occurs in the comparison.

In this embodiment, in S6, the concentration of the pulp processed by the refiner is detected by a concentration detector, the detected data is transmitted to the control center, the detected data is compared with the preset concentration of the control center, an alarm is given when an error occurs in the comparison, and the preset concentration is 10%.

In this embodiment, the waste paper fiber includes long fibers, short fibers, and a mixture of long and short fibers.

In this example, in S2, water was added to the waste paper fibers, and the mixture was stirred and mixed thoroughly for 70min to obtain waste paper pulp, alkali was added to the waste paper pulp to adjust the pH to 9, and then swelling agent was added, and the mixture was stirred and mixed for 70min to soften the fibers.

In this embodiment, in S3, a stirring mechanism is provided in the hopper, and when slurry enters the hopper, the stirring mechanism is started to stir the slurry.

In this embodiment, in S3, add the loading hopper with thick liquids, the solenoid valve on the loading hopper is opened, makes thick liquids get into two sections fiberizers, and after thick liquids add and finish, the solenoid valve is closed, and the blowoff valve is opened, washes in to the loading hopper through the squirt, and sewage is discharged by the blow off pipe.

In this embodiment, in S2, water is added to the used paper fibers, and the amount of water added is monitored by a flow sensor.

Example four

Referring to fig. 1, the process for microfibrillating waste paper fibers comprises the following steps:

s1, firstly, researching the type of waste paper fiber for microfibrillation and determining the type of the waste paper fiber;

s2, adding water, cellulase, alkali and swelling agent into the waste paper fibers, and uniformly stirring to obtain slurry;

s3, adding the pulp into a hopper, and opening an electromagnetic valve on the hopper to enable the pulp to enter a two-stage pulping machine;

s4, monitoring the adding speed of the slurry, and adjusting the adding speed of the slurry through the opening and closing of an electromagnetic valve;

s5, selecting the size of the grinding disc of the pulping machine according to the type of the waste paper fibers and the degree of microfibrillation, and adjusting the gap between the grinding discs;

and S6, finally, mechanically processing the fibers by a refiner.

In this embodiment, in S5, the adjustment distance is input, the adjustment mechanism adjusts the gap between the two segments of refiner plates according to the received data, the distance meter is used to measure the gap between the plates after the adjustment is completed, the measured data is compared with the input adjustment distance, and an alarm is given when an error occurs in the comparison.

In this embodiment, in S6, the consistency of the pulp processed by the refiner is detected by the consistency detector, the detected data is transmitted to the control center, the detected data is compared with the preset consistency of the control center, an alarm is given when an error occurs in the comparison, and the preset consistency is 12%.

In this embodiment, the waste paper fiber includes long fibers, short fibers, and a mixture of long and short fibers.

In this example, in S2, water was added to the waste paper fibers, and the mixture was stirred and mixed thoroughly for 75min to obtain waste paper pulp, and alkali was added to the waste paper pulp to adjust the pH to 10, and then swelling agent was added, and the mixture was stirred and mixed for 75min to soften the fibers.

In this embodiment, in S3, a stirring mechanism is provided in the hopper, and when slurry enters the hopper, the stirring mechanism is started to stir the slurry.

In this embodiment, in S3, add the loading hopper with thick liquids, the solenoid valve on the loading hopper is opened, makes thick liquids get into two sections fiberizers, and after thick liquids add and finish, the solenoid valve is closed, and the blowoff valve is opened, washes in to the loading hopper through the squirt, and sewage is discharged by the blow off pipe.

In this embodiment, in S2, water is added to the used paper fibers, and the amount of water added is monitored by a flow sensor.

EXAMPLE five

Referring to fig. 1, the process for microfibrillating waste paper fibers comprises the following steps:

s1, firstly, researching the type of waste paper fiber for microfibrillation and determining the type of the waste paper fiber;

s2, adding water, cellulase, alkali and swelling agent into the waste paper fibers, and uniformly stirring to obtain slurry;

s3, adding the pulp into a hopper, and opening an electromagnetic valve on the hopper to enable the pulp to enter a two-stage pulping machine;

s4, monitoring the adding speed of the slurry, and adjusting the adding speed of the slurry through the opening and closing of an electromagnetic valve;

s5, selecting the size of the grinding disc of the pulping machine according to the type of the waste paper fibers and the degree of microfibrillation, and adjusting the gap between the grinding discs;

and S6, finally, mechanically processing the fibers by a refiner.

In this embodiment, in S5, the adjustment distance is input, the adjustment mechanism adjusts the gap between the two segments of refiner plates according to the received data, the distance meter is used to measure the gap between the plates after the adjustment is completed, the measured data is compared with the input adjustment distance, and an alarm is given when an error occurs in the comparison.

In this embodiment, in S6, the concentration of the pulp processed by the refiner is detected by a concentration detector, the detected data is transmitted to the control center, the detected data is compared with the preset concentration of the control center, an alarm is given when an error occurs in the comparison, and the preset concentration is 15%.

In this embodiment, the waste paper fiber includes long fibers, short fibers, and a mixture of long and short fibers.

In this example, in S2, water was added to the waste paper fibers, and the mixture was stirred and mixed thoroughly for 80min to obtain waste paper pulp, and alkali was added to the waste paper pulp to adjust the pH to 10, and then swelling agent was added, and the mixture was stirred and mixed for 80min to soften the fibers.

In this embodiment, in S3, a stirring mechanism is provided in the hopper, and when slurry enters the hopper, the stirring mechanism is started to stir the slurry.

In this embodiment, in S3, add the loading hopper with thick liquids, the solenoid valve on the loading hopper is opened, makes thick liquids get into two sections fiberizers, and after thick liquids add and finish, the solenoid valve is closed, and the blowoff valve is opened, washes in to the loading hopper through the squirt, and sewage is discharged by the blow off pipe.

In this embodiment, in S2, water is added to the used paper fibers, and the amount of water added is monitored by a flow sensor.

Examples one to five pulp preset consistency levels are as follows:

examples	A	II	III	Fourthly	Five of them
						Preset concentration of pulp	5%	7%	10%	12%	15%

Main technical indexes

(1) The tightness of finished paper is more than or equal to 0.70g/cm3, the burst index is more than or equal to 2.60 kPa-m 2/g, the ring crush index is more than or equal to 9.0N-m/g, the water absorption (normal/reverse) is less than or equal to 40/70g/m2, the smoothness is more than or equal to 7.0s, and the delivery water content is 8.0 +/-2.0%;

(2) the energy consumption of grinding per unit product is less than or equal to 30 kwh/t;

(3) the wet strength and the dry strength of the product are both increased, the paper breaking frequency of the paper machine is reduced by 30%, the defective rate of the product is reduced to 2%, and the economic profit is directly increased by 200 RMB/year;

(4) the using amount of starch in the pulp is reduced by 50 percent, the unit consumption is reduced to 1kg/t of paper, and the annual cost is saved by about 160 ten thousand yuan; the dosage of other chemical additives is reduced by 10 percent, and the annual cost is saved by about 100 ten thousand yuan.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.