阅读说明：本技术 一种纸张生产工艺 (Paper production process ) 是由 余建北 于 2019-09-12 设计创作，主要内容包括：本发明公开了一种纸张生产工艺,包括打浆、加料搅拌、理顺、抄造、脱水、无规则喷浆、干燥；本工艺可制得性能优良的纸张,保证纸张两面效果基本无差异,保证了原浆内的纤维在经过理顺机构后输出,不会像传统技术一样出现杂乱的情况,提高了纸张的干燥质量；通过无规则喷浆,使得每张纸都是独一无二的,保证纸张不出现断纸情况,保证成纸具有较高的抗张强度,保证抄造过程中具有足够的张力。(The invention discloses a paper production process, which comprises pulping, charging and stirring, straightening, papermaking, dehydration, irregular pulp spraying and drying; the process can prepare the paper with excellent performance, ensures that the effects of the two sides of the paper are basically not different, ensures that the fibers in the primary pulp are output after passing through the straightening mechanism, does not generate disorder condition like the traditional technology, and improves the drying quality of the paper; through the irregular guniting, each piece of paper is unique, the paper breaking condition is avoided, the finished paper is ensured to have higher tensile strength, and the paper making process is ensured to have enough tension.)

1. A paper production process is characterized by comprising the following steps:

S1, pulping: the waste paper and the like are subjected to continuous pulping, and pulping for pulping of the waste paper is performed for 2-4 times by adopting a multi-circulation bin so as to ensure the uniformity of the finished paper; beating of pulping of waste paper tends to be fibrillation, the concentration of a pulp inlet is adjusted, and the heating temperature and the gap of a thermal dispersion grinding disc are controlled;

S2, adding materials and stirring: adding materials and stirring in a stirrer, putting the paper pulp which is fully pulped and beaten into pulp into the stirrer, adding the functional auxiliary agent and fully stirring, and then adding the pulp into a primary pulp funnel, wherein the adding ratio of the paper pulp to the functional auxiliary agent is 100: 6-10;

S3, straightening: conveying the pulp in the primary pulp leakage cylinder to a long-mesh multi-cylinder paper machine through a straightening device to make paper;

S4, papermaking: a fourdrinier multi-cylinder paper machine is used for production, a calender is used for finishing, and the steel roll surface of the calender is in contact with the paper web surface, so that the smoothness difference of the two surfaces is reduced as much as possible;

s5, dehydration: dewatering the paper;

S6, irregular guniting: carrying out irregular guniting on the paper by an irregular guniting device;

S7, drying: and (3) placing the paper subjected to the irregular guniting in a drying chamber, slowly raising the temperature in the drying chamber at a temperature raising rate of 1-2 ℃ per minute until the temperature reaches 75-95 ℃, and drying for 20-30 minutes.

2. A process for the production of paper according to claim 1, characterized in that: in S1, 1 cutting grinding plate and 3 brooming grinding plates are used, the quantitative design of finished paper is 25g/m, the finished paper has good tensile strength, the proportion of waste paper is 55-75% of mass fraction, the ash content is not too high, the mass fraction is controlled below 15%, spindle-shaped liquid filler is selected as the filler, the filler is added simultaneously in a mixing bin and a pulp flushing pool, the complete mixing of the filler and pulp is ensured, and the stability and timeliness of ash content control are ensured.

3. a process for the production of paper according to claim 1, characterized in that: in S4, because the paper-forming basis weight is low, in order to ensure that paper is not broken, the paper-forming must have high tensile strength, and in order to ensure the tensile strength index, the speed difference of each part of the paper machine must be properly increased in addition to the improvement of the waste paper ratio and the proper reduction of the ash content of the paper-forming, so as to ensure that the paper has sufficient tension in the papermaking process.

4. a process for the production of paper according to claim 1, characterized in that: in S7, the drying process is as gentle as possible, and strong drying cannot occur, and the drying curve is optimized reasonably.

5. A process for the production of paper according to claim 1, characterized in that: in S5, in order to ensure the evenness of the paper surface, except that the beating degree of the pulp is higher, 4 groups of vacuum boxes and 6 water scraping plates are used together to complete the dehydration process, an imported polyester three-layer net is adopted to bear the paper, the distance from the upper net to the front of a pressing part is about 8m, the sufficient dehydration capacity of the paper can be ensured, the vacuum dehydration is not too fast or too slow, the position of a waterline is controlled between the 3 rd vacuum box and the 4 th vacuum box, the vacuum degree is as small as possible, and the needle holes of the paper surface caused by the overlarge vacuum are avoided; the angle of the wiper is not too large, and is controlled to be about 20 degrees.

6. a process for the production of paper according to claim 5, characterized in that: if the dewatering capacity is weak, the number of the water scraping plates can be increased continuously to ensure the dewatering capacity, but the forced dewatering can not be realized by adjusting the angle of the water scraping plates to be large; and meanwhile, the paper surface cleanliness is controlled, the slurry is filtered by adopting a four-section deslagging mode, and the tail end tailings are discharged for 1 time every 30 min.

7. a process for the production of paper according to claim 1, characterized in that: in S2, the paper has high opacity index, which is a difficult point for developing paper, because the opacity and tensile strength are restricted in the paper making process, the ash content can not be controlled too high to ensure the tensile strength, the speed difference of each part of the paper machine can not be too small, which conflicts with the control of the opacity index, in S2, the paper pulp after fully pulping is put into a stirrer, then the functional assistant of titanium dioxide is added and fully stirred, and the function assistant of titanium dioxide as the main component is added into the pulp to realize the effect, and the assistant has excellent opacity, is easy to dissolve, has high utilization rate and obvious effect.

Technical Field

the invention relates to the technical field of paper production, in particular to a paper production process.

Background

the papermaking production is divided into two basic processes of pulping and papermaking. Pulping is the process of mechanically, chemically or a combination of both to break apart the plant fiber material into a natural color pulp or a bleached pulp. Paper making is the combination of pulp fibers suspended in water through various processes into sheets meeting various requirements.

The traditional paper production process has the following defects: in the process of outputting the primary pulp, a mechanism for straightening the primary pulp does not exist, so that paper is finally discharged, and the condition of disordered paper grains can occur; the effect difference of the two sides of the paper is large; the drying quality is poor; the paper tension is poor, and paper breaking is easy to occur.

Disclosure of Invention

the invention aims to solve the defects in the prior art and provides a paper production process.

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

A paper production process specifically comprises the following steps:

s1, pulping: the waste paper and the like are subjected to continuous pulping, and pulping for pulping of the waste paper is performed for 2-4 times by adopting a multi-circulation bin so as to ensure the uniformity of the finished paper; beating of pulping of waste paper tends to be fibrillation, the concentration of a pulp inlet is adjusted, and the heating temperature and the gap of a thermal dispersion grinding disc are controlled;

s2, adding materials and stirring: adding materials and stirring in a stirrer, putting the paper pulp which is fully pulped and beaten into pulp into the stirrer, adding the functional auxiliary agent and fully stirring, and then adding the pulp into a primary pulp funnel, wherein the adding ratio of the paper pulp to the functional auxiliary agent is 100: 6-10;

s3, straightening: conveying the pulp in the primary pulp leakage cylinder to a long-mesh multi-cylinder paper machine through a straightening device to make paper;

S4, papermaking: a fourdrinier multi-cylinder paper machine is used for production, a calender is used for finishing, and the steel roll surface of the calender is in contact with the paper web surface, so that the smoothness difference of the two surfaces is reduced as much as possible;

s5, dehydration: dewatering the paper;

S6, irregular guniting: carrying out irregular guniting on the paper by an irregular guniting device;

s7, drying: and (3) placing the paper subjected to the irregular guniting in a drying chamber, slowly raising the temperature in the drying chamber at a temperature raising rate of 1-2 ℃ per minute until the temperature reaches 75-95 ℃, and drying for 20-30 minutes.

Preferably, in S1, 1 cutting grinding plate and 3 brooming grinding plates are used, the quantitative design of the finished paper is 25g/m, the finished paper has good tensile strength, the proportion of the waste paper is 55-75% of the mass fraction, the ash content is not too high, the mass fraction is controlled to be below 15%, spindle-shaped liquid filler is selected as the filler, the filler is added in a mixing bin and a pulp flushing pool simultaneously, the filler and the pulp are completely mixed, and the stability and timeliness of the ash content control are guaranteed.

Preferably, in S4, since the basis weight of the finished paper is low, it is necessary to ensure that the finished paper has a high tensile strength in order to ensure that the paper does not break, and in order to ensure the tensile strength index, the difference in the speeds of the paper machines is appropriately increased in addition to the increase in the proportion of the waste paper and the appropriate reduction in the ash content of the finished paper, so as to ensure sufficient tension in the papermaking process.

Preferably, in S7, the drying process is as gentle as possible, and strong drying cannot occur, and the drying curve is reasonably optimized.

Preferably, in S5, in order to ensure the evenness of the paper surface, 4 groups of vacuum boxes and 6 water scraping plates are used to jointly complete the dehydration process except that the beating degree of the pulp is high, an imported polyester three-layer net is used to bear the paper, the distance from the upper net to the front of a pressing part is about 8m, the sufficient dehydration capacity of the paper can be ensured, the vacuum dehydration is not too fast or too slow, the position of a waterline is controlled between the 3 rd vacuum box and the 4 th vacuum box, the vacuum degree is as small as possible, and the occurrence of needle holes on the paper surface caused by the overlarge vacuum is avoided; the angle of the wiper is not too large, and is controlled to be about 20 degrees.

Preferably, if the dewatering capacity is weak, the quantity of the water scraping plates can be increased continuously to ensure the dewatering capacity, but the forced dewatering cannot be realized by adjusting the angle of the water scraping plates to be large; and meanwhile, the paper surface cleanliness is controlled, the slurry is filtered by adopting a four-section deslagging mode, and the tail end tailings are discharged for 1 time every 30 min.

preferably, in S2, the paper has a high opacity index, which is a difficult point in paper development, because the opacity and the tensile strength are mutually restricted in the paper making process, and the ash content cannot be controlled too high to ensure the tensile strength, and the speed difference of each part of the paper machine cannot be too small, which conflicts with the control of the opacity index, in S2, the fully pulped paper pulp is put into a stirrer, and then the functional assistant of titanium dioxide is added and fully stirred, and the function assistant with titanium dioxide as the main component is added into the pulp to realize the effect, and the assistant has excellent opacity, is easy to dissolve, has high utilization rate and obvious effect.

compared with the prior art, the paper production process provided by the invention comprises the following steps:

1. according to the process, the paper with excellent performance can be prepared by pulping, feeding and stirring, straightening, papermaking, dewatering, irregular pulp spraying and drying, the effect of the two sides of the paper is basically not different, the output of the fibers in the primary pulp after passing through the straightening mechanism is ensured, the messy condition is avoided as in the traditional technology, and the drying quality of the paper is improved; by the aid of irregular guniting, each piece of paper is unique, paper breaking is avoided, high tensile strength of finished paper is guaranteed, and sufficient tension is guaranteed in the papermaking process;

2. The long-net multi-cylinder paper machine is used for production, so that the effects of two surfaces of paper are basically not different;

3. through the straightening, the fibers in the primary pulp are output after passing through the straightening mechanism, and the disorder condition of the traditional technology is avoided;

4. The paper pulp after fully pulping is put into a stirrer, then the functional auxiliary agent of titanium dioxide is added and fully stirred, and the function of adding the functional auxiliary agent of which the main component is titanium dioxide into the pulp is realized, wherein the auxiliary agent has excellent opacity, is easy to dissolve, has high utilization rate and obvious effect;

5. the drying temperature is slowly increased, and the drying quality of the paper is improved; each piece of paper is unique through irregular guniting;

6. The adding mode is that the mixing bin and the pulp flushing tank are added simultaneously, so that the complete mixing of the filler and the pulp is ensured, and the stability and timeliness of ash content control can be ensured; the paper is ensured not to be broken, the finished paper is ensured to have higher tensile strength, and the paper has enough tension in the papermaking process.

Detailed Description

in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.