Production method for preparing wormwood paper from wormwood

Abstract

The production method comprises the following steps: cutting off a wormwood raw material, removing impurities, washing, feeding the wormwood raw material into a cone mill through a wormwood sheet pump, grinding the wormwood raw material until the pulp concentration is 2-4%, concentrating the ground pulp to 20-35% by using concentration equipment, enabling white water to flow back to a hydraulic grass washing machine for concentration adjustment, and feeding the ground pulp into a two-stage pressure screen for screening. The preparation method comprises the following steps: feeding unbleached wood pulp with the beating degree of 38-42 degrees SR into a pulp preparation tank according to a proportion, adjusting the proportion of the wood pulp, adding a dispersing agent (CMC with the dosage of 0.5-2%), a softening agent (organosilicon with the dosage of 0.5%) and a cylinder separating agent (with the dosage of 0.1%) into the pulp preparation tank, controlling by adopting DSC in the process, and controlling the proportion of the prepared pulp and chemicals on line by a flow meter to obtain the wormwood paper. According to the wormwood paper, wormwood fibers are coated with a natural-color wood pulp fiber network structure, the characteristics of natural components of wormwood are restored to the maximum extent, the wormwood paper is quantitatively controlled in the category of common paper for daily use and is 14-20 g / m < 2 >, and the wormwood paper becomes various types of paper for daily use required by the market through post-processing procedures such as embossing and compounding.

Description

Technical Field

[0001] The invention belongs to the technical field of functional paper, and particularly relates to a method for preparing wormwood paper by utilizing wormwood. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Mugwort has strong adaptability and is widely distributed in my country. It can grow in all areas except extremely cold and arid areas. It is commonly found on roadsides, in wilderness, and on grasslands. It is a traditional Chinese medicinal material that is easy to obtain and use. The stems and leaves of mugwort contain a large amount of volatile oils, sesquiterpenoid compounds, and flavonoid compounds. It has a special aroma and antibacterial, calming, and sleep-inducing effects. In folk medicine, mugwort is often made into moxa sticks and moxa wool for moxibustion, fumigation, and bathing. With the continuous advancement of science and technology, the research on the active substances and effects of mugwort has become more in-depth, and the use of mugwort has become more and more extensive. In addition to playing a role in the treatment and prevention of diseases in traditional Chinese medicine, it is also widely used in food, textiles, agriculture, animal husbandry and other fields. Patent CN111691210A provides a method for preparing wormwood pulp fiber and its application. The wormwood pulp fiber is obtained through pre-impregnation, chemical pretreatment, extrusion, tearing and grinding, and then paper is made using a Kaiser sheeter. The process is simple, green and pollution-free, and a large amount of effective active ingredients are retained. The pulp has good paper strength, high added value, and is rich in the medicinal aroma of the wormwood raw material.

[0004] Patent CN109024021A proposes a processing technology and a processing device for mugwort paper, which involves washing and crushing the mugwort and then steaming it with hot water to separate the fibers into pulp, which is then beaten and used for papermaking.

[0005] The above patents can all prepare mugwort into pulp. Although pulp fiber is closer to traditional plant fiber for papermaking, there are problems such as excessive loss of effective ingredients in mugwort, low yield, low utilization rate, difficult wastewater treatment, and poor paper strength, making it difficult to truly achieve large-scale utilization of mugwort paper. Therefore, how to maximize the use of mugwort resources and meet the market demand for mugwort paper urgently requires an environmentally friendly and feasible production method. Summary of the invention

[0006] In view of the shortcomings of the prior art, the object of the present invention is to provide a production method for preparing wormwood paper from wormwood.

[0007] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0008] The stems and leaves of mugwort are used as raw materials, and precise pulping is carried out to achieve full utilization of the mugwort. At the same time, in order to address the problems of low strength of fiber paper and easy shedding and powdering, commercial natural wood pulp and dispersant CMC are added to construct a three-dimensional long fiber network structure. This structure makes the mugwort fibers covered with a fiber network, and through wet molding, pressing, drying, and curling, the continuous papermaking production of mugwort paper is realized.

[0009] A method for producing wormwood paper from wormwood, characterized by comprising the following steps:

[0010] S1. Cutting: Cutting the wormwood raw material into a size of 5-50 mm by using a disc cutter or a roller cutter;

[0011] S2, washing; using a hydraulic grass washer to wash the above-mentioned cut materials, the washing time is 5-10min;

[0012] S3, Cone mill: It adopts a stepped conical rotor, and the space between the stator and the rotor is divided into a crushing zone, a coarse grinding zone, and a fine grinding zone, wherein the gap in the fine grinding zone is 0-0.15mm;

[0013] S4. Concentration: The milled pulp is concentrated to 20-35% using a double-net pulp washer or other concentrating equipment, and the white water flows back to the hydraulic straw washer to adjust the concentration.

[0014] S5. Screening: A two-stage pressure screen is used. The tailings of the second-stage pressure screen are returned to the entrance of each good pulp stage, and the tailings of the first-stage pressure screen are returned to the hydraulic pulp washer.

[0015] S6. Pulping: Mix the beaten natural wood pulp with mugwort pulp in a certain proportion, with the wood pulp ratio being 10-50%, and add 1-5% CMC according to product requirements to improve the dispersion of the fibers.

[0016] S7: Then, the steps of forming, pressing, drying and curling are carried out, and the same process and equipment as those for making traditional household paper are adopted to obtain the prepared mugwort paper.

[0017] In the steps S1-S7, the production water is used in countercurrent flow, the washing water is precipitated and clarified through the inclined plate and then completely recycled, and the water extract of the raw material is retained between the fiber networks as the paper sheets are formed and dried after the white water concentration reaches equilibrium, providing the product with a unique fragrance and the unique health care functions of mugwort.

[0018] The wormwood paper is coated with wormwood fibers with a natural wood pulp fiber network structure, maximizing the restoration of the characteristics of the natural components of wormwood, and the quantitative control is within the range of general household paper, which is 14-20g / m 2 , after embossing, lamination and other post-processing procedures, it becomes various types of household paper required by the market.

[0019] The beneficial effects achieved by one or more embodiments of the present invention are as follows:

[0020] 1. A simplified production method is proposed. The pulping process does not require the addition of chemicals such as NaOH, nor does it require hot water cooking. Through precise pulping, the full utilization of the whole stalk of mugwort (including mugwort leaves) can be achieved.

[0021] 2. During the pulping process, by adding commercial natural wood pulp and dispersant CMC, a three-dimensional long fiber network structure is constructed. This structure makes the wormwood fibers covered with the fiber network. Wormwood stems, wormwood leaves and other miscellaneous cells rich in wormwood aroma substances are all retained in the paper fiber network and will not be lost. The utilization rate of wormwood is greater than 90%.

[0022] 3. The wormwood paper provided by the present invention not only has the function of being used as daily life paper, but also has the unique aroma and medicinal value of wormwood.

[0023] 4. The wormwood paper production method provided by the present invention can realize large-scale continuous production, with simple and flexible process, mature and reliable equipment, green and clean production process, closed-loop production process, and the discharged sludge is limited to the mud and dust brought in by the raw materials. DETAILED DESCRIPTION

[0024] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0025] The present invention has no special restrictions on the type and source of the wormwood raw material used.

[0026] Example 1

[0027] (1) Product properties: Natural mugwort toilet paper, basis weight 18g / m 2

[0028] (2) Raw material preparation: The wormwood raw materials are transported from the yard to a belt conveyor by a forklift, and then sent to a grass cutter (disc or roller type) by the belt conveyor for cutting. The cutting specification is 5-50mm. The cut raw materials are passed through a roller dust collector to remove impurities such as stones, sand and dust. The dust-removed raw materials are sent to a hydraulic grass washer for washing to further remove impurities in the raw materials.

[0029] (3) Refining: The cleaned material is pumped into the cone mill through a straw pump, and the refining concentration is 2-4%.

[0030] (4) Concentration: The milled pulp is concentrated to 20-35% using a double-wire pulp washer (or other concentrating equipment), and the white water flows back to the hydraulic straw washer to adjust the concentration.

[0031] (5) Screening: The pulp after grinding is sent to two-stage pressure screens for screening. The first-stage pressure screen is a slot screen with a screen slot of 0.15 mm. The good pulp is sent to the second-stage pressure screen, and the tail pulp is sent to a hydraulic straw washer. The second-stage pressure screen has a screen slot of 0.12 mm. The good pulp is sent to the pulp mixing pool, and the tail pulp is sent to the pulp storage tank after grinding.

[0032] (6) Pulping: Send the natural wood pulp with a beating degree of 38-42°SR to the pulping tank in proportion, with the wood pulp accounting for 50%; add dispersant (CMC, dosage 0.5-2%), softener (silicone type, dosage 0.5%), and cylinder separation agent (dosage 0.1%) into the pulping tank;

[0033] DCS control is adopted, and the ratio of slurry and chemicals is controlled online by flow meter.

[0034] (7) Papermaking: The pulp is diluted to 0.5-0.8% in the pre-papermaking tank and sent to the papermaking machine (fourdrinier paper machine or inclined wire paper machine)

[0035] Example 2

[0036] (1) Product properties: Natural mugwort tissue paper, basis weight 20g / m 2 .

[0037] (2) Raw material preparation, washing, refining, concentration, screening, papermaking and automatic control are the same as those in Example 1.

[0038] (3) Pulping: The natural wood pulp with a beating degree of 40-45°SR is sent to the pulping tank in proportion, and the proportion of wood pulp is 40%.

[0039] (4) Chemicals: Add dispersant (CMC, dosage 0.5-2%), softener (silicone type, dosage 0.5%), cylinder release agent (dosage 0.1%), and wet strength agent (PAE, dosage 1%) into the slurry mixing tank.

[0040] Example 3

[0041] (1) Product properties: Natural mugwort hand towel, basis weight 41g / m 2

[0042] (2) Raw material preparation, washing, refining, concentration, screening, papermaking and automatic control are the same as those in Example 1.

[0043] (3) Pulping: The natural wood pulp with a beating degree of 40-45°SR is sent to the pulping tank in proportion, with the wood pulp ratio being 40%.

[0044] (4) Chemicals: Add dispersant (CMC, dosage 0.5-2%), softener (silicone type, dosage 0.5%), cylinder release agent (dosage 0.1%), wet strength agent (PAE, dosage 1%), and antibacterial agent (dosage 0.01-0.05%) into the slurry mixing tank.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for producing wormwood paper from wormwood, characterized in that: include: Cutting, washing, cone grinding, concentration, screening, pulping, forming, pressing, drying and curling steps; Among them, the cone mill pulping process does not require hot water cooking or the addition of NaOH chemicals; After mugwort is pulped and made into household paper, the addition of dispersants can optimize the fiber network structure of the paper sheet, making it have higher wet strength during papermaking.

2. The production method according to claim 1, characterized in that The cutting steps are as follows: using a disc cutter or a roller cutter to cut the whole stalk of the mugwort, and the cutting length is 0.5-5cm.

3. The production method according to claim 1, characterized in that The washing steps are as follows: after being cut, the wormwood raw materials are sent to a hydraulic grass washing machine for washing, and the washing concentration is 2-4%.

4. The production method according to claim 1, characterized in that The steps of cone milling are as follows: the washed raw materials are pumped into the cone mill, the cone mill rotor adopts a stepped design, and the coarse residue rate after grinding is less than 10%.

5. The production method according to claim 1, characterized in that: The concentration steps are as follows: the milled pulp is concentrated by a double-wire washing machine, and the pulp concentration is 20-35%. The concentrated pulp is adjusted with paper machine white water and then sent to a pulp storage tank.

6. The production method according to claim 1, characterized in that: The screening steps are as follows: the fibers in the pulp storage tank are sent to pressure screening, the screening is divided into two levels, the screening concentration is 1-2%, and the screened pulp enters the mugwort pulp mixing pool.

7. The production method according to claim 1, characterized in that: The pulping steps are as follows: first, the natural coniferous pulp is beaten with a disc refiner to a medium-consistency pulping degree of 28-40°SR, and then sent to a pulp storage tank; secondly, the pulping is completed in a pulping pool, and the natural coniferous pulp and mugwort pulp are mixed in proportion, with the proportion of natural wood pulp being 10-50%, and the mixed pulp is pumped into the pre-papermaking pool.

8. The production method according to claim 7, characterized in that: Add CMC in the slurry mixing tank: dosage 0.5-2%, silicone type: dosage 0.5%, cylinder release agent: dosage 0.1%.

9. The production method according to claim 1, characterized in that: The pulp is made into paper from the paper feeding machine in the fore-papering pool. The papermaking machine can be a fourdrinier paper machine or an inclined-wire paper machine. After the wet paper sheets are dehydrated, they are pressed, dried, wrinkled and curled to form household paper products.

10. The production method according to claim 1, characterized in that: The white water in the production process is recycled in reverse flow. The white water from papermaking flows back to the pressure screen for concentration adjustment, and the white water from the double-net washing machine flows back to the pulper for concentration adjustment, thus realizing a closed circulation of white water.