CN116289324A - Method for producing ultralow gram weight paper - Google Patents
Method for producing ultralow gram weight paper Download PDFInfo
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- CN116289324A CN116289324A CN202310366044.5A CN202310366044A CN116289324A CN 116289324 A CN116289324 A CN 116289324A CN 202310366044 A CN202310366044 A CN 202310366044A CN 116289324 A CN116289324 A CN 116289324A
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- 235000017166 Bambusa arundinacea Nutrition 0.000 claims abstract description 58
- 235000017491 Bambusa tulda Nutrition 0.000 claims abstract description 58
- 241001330002 Bambuseae Species 0.000 claims abstract description 58
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims abstract description 58
- 239000011425 bamboo Substances 0.000 claims abstract description 58
- 238000001035 drying Methods 0.000 claims abstract description 50
- 238000004537 pulping Methods 0.000 claims abstract description 46
- 239000000835 fiber Substances 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000011121 hardwood Substances 0.000 claims abstract description 23
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 22
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Images
Classifications
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/34—Kneading or mixing; Pulpers
- D21B1/345—Pulpers
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
- D21H11/04—Kraft or sulfate pulp
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Abstract
The invention relates to the technical field of household paper, and discloses an ultra-low gram weight paper production method, which comprises the following steps: selecting a mixture of bamboo pulp and wood pulp, wherein the bamboo pulp is sulfate bamboo pulp, and the wood pulp is hardwood pulp; pulping, namely pulping the bamboo pulp and the wood pulp by different pulpers respectively, and performing slag removal procedures to refine the bamboo pulp and the wood pulp; grinding, namely grinding the bamboo pulp and the wood pulp through a conical grinder respectively, so as to improve the bonding force between fibers; mixing and stirring bamboo pulp and wood pulp according to a ratio of 3:2 to form bamboo-wood mixed pulp; sizing, namely adding white water into the bamboo-wood mixed slurry for dilution; making paper, namely feeding diluted bamboo-wood mixed pulp into a crescent former, and making paper to obtain a wet paper web; drying the drying cylinder, and sending the wet paper web into the drying cylinder for drying to obtain paper; and (3) wrinkling, namely wrinkling the paper by using a wrinkling alloy knife. The ultra-low gram weight household paper with good quality is obtained with lower production cost.
Description
Technical Field
The invention relates to the technical field of household paper, in particular to a production method of ultralow gram weight paper.
Background
With the vigorous development of the e-commerce mode, the traditional household paper widens the sales channel depending on the e-commerce sales mode, the e-commerce type product is mainly sold in high sales, the household paper is promoted in a thin and multi-marketing mode, and positive contribution is made to the improvement of the whole household paper consumption in China. The e-commerce products of thin and multi-marketing compete, and the quality and cost compete. The quality is the real demand of consumers, and the quality is stabilized to be able to withstand market test; the cost control is the basis of the standing of the traditional manufacturing industry, the production cost is controlled, and enterprises can possibly survive and benefit in the market.
Based on the market environment, on the premise of ensuring the paper quality, the ultra-low gram weight household paper with good quality can not only meet the requirements of customers on high cost performance products, but also help enterprises to reduce the production cost.
Disclosure of Invention
The invention aims to provide a production method of ultralow gram weight paper, which can obtain ultralow gram weight household paper with good quality at lower production cost.
In order to achieve the above purpose, the invention adopts the following technical scheme: the production method of the ultralow grammage paper comprises the following steps:
selecting a mixture of bamboo pulp and wood pulp, wherein the bamboo pulp is sulfate bamboo pulp, and the wood pulp is hardwood pulp;
pulping, namely pulping the bamboo pulp and the wood pulp by different pulpers respectively, and performing slag removal procedures to refine the bamboo pulp and the wood pulp;
grinding, namely grinding the bamboo pulp and the wood pulp through a conical grinder respectively, so as to improve the bonding force between fibers;
mixing and stirring bamboo pulp and wood pulp according to a ratio of 3:2 to form bamboo-wood mixed pulp;
sizing, namely adding white water into the bamboo-wood mixed slurry for dilution;
making paper, namely feeding diluted bamboo-wood mixed pulp into a crescent former, and making paper to obtain a wet paper web;
drying the drying cylinder, and sending the wet paper web into the drying cylinder for drying to obtain paper;
and (3) wrinkling, namely wrinkling the paper by using a wrinkling alloy knife.
The beneficial effect of this scheme is: 1. the bamboo pulp provides long fibers for the composition of the paper, and the long fibers ensure the toughness and strength of the paper; hardwood pulp provides short fibers for the composition of the paper, and the short fibers ensure the softness and fineness of the paper; because bamboo has the characteristics of fast growth, short cutting period, high yield and the like, the use cost is relatively low, the bamboo is convenient to cut and transport, and enterprises can be further helped to reduce the cost required by production.
2. Mixing and stirring the sulfate bamboo pulp and the hardwood pulp according to the proportion of 3:2 to obtain bamboo wood mixed pulp, and improving the ratio of short fibers in paper components, so that the weight of paper is reduced while the quality of paper with ultra-low gram weight is ensured, and the aim of reducing the production cost of the paper is fulfilled.
3. Meanwhile, slag removal refining is carried out after pulping, a sizing step is set to dilute the bamboo-wood mixed pulp, so that the bamboo-wood mixed pulp is uniformly dispersed, the thickness of the formed paper is uniform, and the paper quality of the ultralow gram weight paper is improved.
4. By separate pulping operation of the bamboo pulp and the wood pulp, different pulping power can be selected according to different characteristics of long fibers and short fibers, and the short fibers adopt relatively smaller power to reduce the pulping degree, so that the cutting of the fibers is reduced; the long fiber adopts relatively larger power, increases the pulping strength so as to achieve the effect of fully separating filaments and brooming the long fiber, and can realize that the bamboo pulp adopts wet pulp and the hardwood pulp adopts dry pulp so as to further reduce the raw material purchasing cost and the equipment operation cost.
Preferably, the surface of the wrinkling alloy blade contacted with the paper is a blade surface, the angle of the blade surface is 78 degrees, and the wrinkling rate of the wrinkling alloy blade on the paper is 21.0-27.0 percent.
The beneficial effect of this scheme is: the larger the angle of the knife edge surface is, the larger the wrinkling rate of the surface is caused by scratching paper on a dryer, and when the wrinkling rate of the ultralow gram-weight paper is controlled between 21.0 and 27.0 percent due to the higher content of short fibers, the softness of the paper can be improved, the quality of the paper can be ensured, and the wrinkling rate aisle can be avoided from being damaged.
Preferably, in the pulping step, the wet weight of the bamboo pulp is set to be 9.0-11.0g, and the beating degree is set to be 27.0-29.0 DEG SR.
The beneficial effect of this scheme is: the beating degree of the bamboo pulp for providing the long fibers is set between 27.0-29.0 DEG SR, and the long fibers are fully split and swelled and fibrillated under the condition that the strength of the paper is ensured by the long fibers, so that the bonding strength of the long fibers and the short fibers in the pulp preparation of the next step is improved.
Preferably, the pH value of the white water is controlled between 7.5 and 8.1, and the concentration of the bamboo-wood mixed pulp after sizing and ending is 3.0 to 3.2 percent.
The beneficial effect of this scheme is: avoid the failure of wet strength agent and influence the wet strength of the paper made by ultra-low gram weight paper.
Preferably, the pulping step further comprises adding an intensity agent, wherein the intensity agent comprises beating enzyme, and the dosage of the beating enzyme ranges from 0.06 kg/T to 0.1 kg/T.
The beneficial effect of this scheme is: pulping enzymes with the weight of 0.06-0.1kg/T are respectively added into the hydraulic pulper, so that the pulping efficiency and the pulping effect are improved, and the tensile strength and the burst strength of the formed paper are ensured
Preferably, the sizing step further comprises the addition of functional auxiliary agents, wherein the functional auxiliary agents comprise wet strength agents, and the dosage range of the wet strength agents is 11.0-15.0 kg/T.
The beneficial effect of this scheme is: the method has the advantages that the phenomenon that the addition amount of the wet strength agent is too small is avoided, no obvious effect is caused on improving the wet strength of paper, and the phenomenon that the flocculation of bamboo pulp or hardwood pulp is caused and the uniformity of finished paper is influenced due to the fact that the addition amount of the wet strength agent is too large can be avoided.
Preferably, both the pulping and refining steps include the addition of process aids including deposit control agents and alkali to achieve water recycling.
The beneficial effect of this scheme is: the acid and alkali of water in the pulping and pulping steps are adjusted by adding the active alkali, and bacteria, microorganisms and the like in the water are killed by the bactericide, so that the water is recycled, and the production cost of enterprises is further reduced; the defoaming agent can eliminate foam in the circulating water, and prevent the foam from adhering to the surface of the wet paper web to cause diseased paper, thereby ensuring the paper quality of the paper with ultra-low gram weight.
Preferably, the cylinder drying step further comprises a hot air hood and a boot pressure technology.
The beneficial effect of this scheme is: the shoe press is beneficial to solidification of the wet paper web, so that the wet paper web obtains better strength before drying, thereby obtaining better running performance of a press part, reducing the water content in the paper web and saving steam consumption; the hot air cover improves the bulk and softness of the paper while improving the drying efficiency.
Preferably, the method further comprises a vacuum dehydration step, wherein the vacuum dehydration step comprises a suction box and a pipetting box.
The beneficial effect of this scheme is: suction holes are formed in the surfaces of the suction box and the suction transfer box, negative pressure is formed at the suction holes, so that air flow is formed on the vertical surface of the movement direction of the wet paper web, moisture on the wet paper web can be sucked away along with the air flow through the suction holes, and meanwhile, the moisture evaporation rate of the surface of the wet paper web can be accelerated under the action of the air flow, so that accelerated dehydration is realized.
Preferably, the suction box and the suction box are controlled to have a nip between 30 and 40KPa to ensure that the wet web has a moisture content between 55 and 60% before drying in the cylinders.
The beneficial effect of this scheme is: the pressure is controlled to be 30-40KPa, so that the dewatering efficiency is improved, the water content of the wet paper web before being fed into a drying cylinder is more conveniently controlled to be 55-60%, and the water content of paper after being dried by the drying cylinder is further ensured to be 6.7-7.7%; and the water content of the wet paper web is controlled between 55 and 60 percent, so that the safety accident of fire caused by the too low water content of the wet paper web can be avoided.
Drawings
FIG. 1 is a flow chart of embodiment 1 of the present invention;
fig. 2 is a flowchart of embodiment 2 of the present invention.
Detailed Description
The following is a further detailed description of the embodiments:
example 1
Example 1 a process for producing ultra low grammage paper as shown in figure 1, substantially as shown in figure 1, comprising the steps of:
step one, selecting materials, wherein the papermaking raw materials are selected from mixed materials of bamboo pulp raw materials and wood pulp raw materials, and in the embodiment, the bamboo pulp raw materials are selected from sulfate bamboo pulp, so that long fibers are provided for the composition of paper, and the long fibers ensure the toughness and strength of the paper; the wood pulp is selected from hardwood pulp, short fibers are provided for the composition of the paper, and the softness and fineness of the paper are ensured by the short fibers. Because the bamboo has the characteristics of fast growth, short cutting period, high yield and the like, the use cost is relatively low, the bamboo is convenient to cut and transport, and enterprises can be further helped to reduce the cost required by production; meanwhile, the bamboo fiber is relatively light, and can meet the weight requirement of ultralow gram weight paper.
Step two, pulping, namely respectively putting the bamboo pulp and the hardwood pulp into different hydraulic pulpers to respectively perform pulping operation. During pulping, pulping enzymes of 0.06-0.1kg/T are respectively added into the hydraulic pulping machine, so that the pulping efficiency and the pulping effect are improved, the tensile strength and the burst strength of the formed paper are ensured, and in the embodiment, the addition amount of the pulping enzymes is 0.8kg/T; after the pulping is finished, the high-concentration slag remover is used for removing slag from the bamboo pulp and the hardwood pulp which are in a suspension state, so that the refining of the bamboo pulp and the hardwood pulp is finished, and the quality of the paper with ultra-low gram weight is ensured.
In order to further reduce the production cost of producing ultra-low grammage paper, in this embodiment, the raw material of hardwood pulp is purchased as a dry pulp raw material, so as to reduce the transportation cost and purchasing cost of the raw material; the wet pulp is selected as the bamboo pulp, and the surface of the long fiber is more easily divided into filaments and is easier to pulp in the wet pulp which is not subjected to drying treatment, so that the energy consumption can be saved, and the cost can be reduced. Carrying out low-concentration pulping on dry pulp of hardwood pulp in a hydraulic pulper, wherein the dilution concentration is controlled to be between 5.5 and 6.5 percent, the pulp crushing concentration is controlled to be between 5.5 and 7.5 percent, and in the embodiment, the dilution concentration is 6.0 percent and the pulp crushing concentration is 6.5 percent; in addition, because hardwood pulp is short fiber, the difficulty of purchasing dry pulp for pulping is also low.
And thirdly, grinding, namely grinding the bamboo pulp and the hardwood pulp through a conical grinder respectively so as to improve the binding force and the binding strength between fibers and realize the aim of improving the paper strength. Meanwhile, according to different characteristics of long fibers and short fibers, different pulping powers are selected during pulping, and the short fibers adopt relatively smaller power to reduce the pulping degree, so that the cutting of the fibers is reduced; the long fiber adopts relatively higher power and increases the pulping strength so as to achieve the full fiber-dividing and brooming effects on the long fiber; in the embodiment, the refining power of the bamboo pulp ranges from 40 Kwh/t to 60Kwh/t, the refining power of the hardwood pulp ranges from 20 Kwh/t to 30Kwh/t, and after the refining is finished, the wet weight of the bamboo pulp is controlled to be 9.0 g to 11.0g, the beating degree is controlled to be 27.0 DEG SR to 29.0 DEG SR, and in the embodiment, the refining power of the bamboo pulp is 50Kwh/t, the refining power of the hardwood pulp is 25Kwh/t, the wet weight of the bamboo pulp is 10.0g, and the beating degree is 28.0 DEG SR; under the condition that the long fibers ensure the strength of the paper, the long fibers are fully divided into filaments and broomed, and the bonding strength of the long fibers and the short fibers is improved. In addition, the mode of separately grinding pulp can also facilitate the accurate adjustment of the pulp proportion in the next step.
Meanwhile, in order to improve the wet strength of the paper with ultra-low gram weight, ensure the strength of the paper after being wetted and realize the aim of improving the quality of the paper, 11.0-15.0kg/T of wet strength agent (namely, polyamide polyamine epoxy resin) is respectively added into a conical refiner; the method is characterized by comprising the following steps of: when the addition amount of the wet strength agent is less than 11.0kg/T, no obvious effect is provided for improving the wet strength of the paper, and when the addition amount of the wet strength agent is more than 15.0kg/T, the flocculation of bamboo pulp or hardwood pulp can be caused, and the uniformity of the paper is affected; in this example, the amount of the wet strength agent added was 13.0kg/T.
And step four, pulp mixing, namely mixing and stirring the sulfate bamboo pulp and the hardwood pulp according to the proportion of 3:2 to obtain the bamboo-wood mixed pulp. The weight of paper is reduced while the quality of paper with ultra-low gram weight is ensured by improving the ratio of short fibers in paper components, so that the aim of reducing the production cost of paper is fulfilled.
And fifthly, sizing, namely adding white water into the bamboo-wood mixed slurry with the sizing completion for dilution, and controlling the concentration of the bamboo-wood mixed slurry to be 3.0-3.2% during sizing, wherein the sizing proportion and the water feeding proportion are 1:1. Sizing can uniformly disperse bamboo-wood mixed pulp, so that the thickness of the formed paper is consistent, and the quality of the formed paper is improved; meanwhile, in order to avoid the failure of the wet strength agent, the PH value of the white water is set between 7.5 and 8.1; in this example, the concentration of the bamboo-wood slurry was 3.1% and the PH of the white water was 7.7.
And step six, manufacturing, namely delivering the diluted bamboo-wood mixed pulp into a crescent former, and manufacturing a wet paper web after spraying, net-surfing, forming and squeezing dehydration procedures.
And seventhly, drying the drying cylinder, feeding the wet paper web obtained by paper making into the drying cylinder, setting the temperature of the drying cylinder to 120 ℃, and drying the wet paper web by using high temperature to obtain paper. In addition, in the embodiment, the high-efficiency hot air hood and the boot pressure technology are adopted to carry out squeezing dehydration before drying by the drying cylinder; the shoe press is beneficial to solidification of the wet paper web, so that the wet paper web obtains better strength before drying, thereby obtaining better running performance of a press part, reducing the water content in the paper web and saving steam consumption; the hot air cover improves the bulk and softness of the paper while improving the drying efficiency.
The pressure of the drying cylinder, the temperature of the gas hood and the boot pressure are shown in a table 1:
after drying, the water content of the paper is between 6.7 and 7.7 percent.
Step eight, wrinkling, namely wrinkling the paper by using a wrinkling alloy blade so as to increase the bulk and the elongation of the paper; the surface of the creping alloy blade in contact with the paper is the blade surface, which in this embodiment is set at 78 °. The larger the angle of the knife edge surface is, the larger the wrinkling rate of the surface is caused by scratching paper on a dryer, and when the wrinkling rate of the paper with ultra-low gram weight is controlled between 21.0 and 27.0 percent due to the high content of short fibers, the softness of the paper can be improved, the quality of the paper can be ensured, and the wrinkling rate aisle can be avoided from being damaged, in the embodiment, the wrinkling rate is 24 percent.
In addition, the method also comprises the addition of chemical paint before the drying step of the dryer, wherein the paint comprises a cylinder sticking agent, a stripping agent and an improver. The cylinder sticking agent ensures that the wet paper web can be closely attached to the surface of the drying cylinder in the drying process, thereby improving the drying effect, and simultaneously ensuring that the paper is closely attached to the drying cylinder in the wrinkling step to realize uniform wrinkling of the paper, thereby further improving the paper quality; the stripping agent enables the wet paper web to be smoothly separated from the drying cylinder in the steps of papermaking and drying the drying cylinder, so that the phenomenon that too large holes and too much felt hair appear on the surface of paper due to adhesion is avoided; the modifier can reduce the surface abrasion of the drying cylinder and prolong the service life of the wrinkling alloy blade. When in use, the cylinder sticking agent, the stripping agent and the modifying agent are firstly mixed with water, and then the mixture is uniformly sprayed on the surface of a drying cylinder in a spraying mode, the pressure during coating is 3.8-4.3bar, the water temperature during coating is controlled between 35 and 50 ℃, and in the embodiment, the coating pressure is 4.1bar, and the water temperature is 42 ℃.
Meanwhile, in the pulping and refining steps, the addition of a deposit control agent and a living alkali is also included, and the specific addition amounts are shown in Table 2:
the acid and alkali of water in the pulping and pulping steps are adjusted by adding the active alkali, and bacteria, microorganisms and the like in the water are killed by the bactericide, so that the water is recycled, and the production cost of enterprises is further reduced; the defoaming agent can eliminate foam in the circulating water, and prevent the foam from adhering to the surface of the wet paper web to cause diseased paper, thereby ensuring the paper quality of the paper with ultra-low gram weight. Comparative example 1, unlike example 1, in step three, the degree of beating of the bamboo pulp was controlled at 35.0 ° SR in the refining; the main parameters of the paper obtained in comparative example 1 are shown in Table 3.
Comparative example 2, unlike example 1, in step four, in the pulping, the sulfate bamboo pulp and hardwood pulp were mixed and stirred in a ratio of 3:3 to obtain a bamboo wood mixed pulp; the main parameters of the paper obtained in comparative example 2 are shown in Table 3.
Comparative example 3, unlike example 1, in step eight, the edge face angle was set to 85 ° in the wrinkling, thereby controlling the wrinkling rate to 32.0%; the main parameters of the paper obtained in comparative example 3 are shown in Table 3.
| Main parameters | Example 1 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Quantification (g/m) 2 ) | 11.4 | 11.4 | 11.4 | 11.4 |
| Thickness (mm/10 ply) | 0.93 | 0.86 | 0.93 | 0.93 |
| Longitudinal tensile index (N.m/g) | 5.4 | 5.8 | 5 | 5.4 |
| Transverse tensile index (N.m/g) | 2.5 | 2.7 | 2.2 | 2.5 |
| Moisture (%) | 7.2 | 7.2 | 7.2 | 7.2 |
| Elongation in machine direction (%) | 25 | 25 | 25 | 25 |
| Wet tensile Strength in machine direction (N/m) | 18 | 18 | 16 | 18 |
| Cross-mean softness (three layers) | 95 | 100 | 92 | 108 |
| Eyelet (phi 2-5 mm) | ＜16 | ＜16 | ＜16 | ＜16 |
| Dust degree (0.2-1.0 m square meter) | ＜30 | ＜30 | ＜30 | ＜30 |
In comparative example 1, after the degree of beating of the bamboo pulp was improved, the thickness of the paper was decreased, and the softness of the paper was increased, and the softness thereof was decreased;
in comparative example 2, after the kraft pulp and hardwood pulp were mixed in a ratio of 3:3, the thickness of the obtained paper was increased, but both the longitudinal tensile index and the transverse tensile index were decreased, and the longitudinal wet tensile strength was also decreased accordingly, resulting in decrease in both the wet strength and toughness of the paper;
in comparative example 3, increasing the angle of the edge face of the creping alloy blade increases the creping rate of the paper, which results in an increase in softness of the paper, thereby decreasing softness of the paper and affecting the feel of use of the ultra-low grammage paper.
In summary, firstly, a relatively reduced beating degree is controlled on bamboo pulp, then sulfate bamboo pulp and hardwood pulp are mixed and stirred according to a ratio of 3:2, after bamboo wood pulp mixing is obtained, a series of steps such as sizing, forming, drying and the like are carried out, and then, the angle of the edge face of the wrinkling alloy blade is 78 degrees, so that the ultra-low gram weight paper which meets the requirements of national standards on high-quality household paper in thickness, longitudinal and transverse average softness, longitudinal wet tensile strength and the like and has light weight can be obtained, and enterprises can be helped to reduce production cost.
Example 2
The ultra-low grammage paper production method as shown in fig. 2 differs from example 1 in that: the method comprises the steps of drying, pressing, drying and drying, and is characterized by further comprising a vacuum dehydration step arranged between the pressing step in papermaking and the drying cylinder, wherein the vacuum dehydration step comprises a suction box and a suction and transfer box, suction holes are formed in the surfaces of the suction box and the suction and transfer box, negative pressure is formed at the suction holes, so that air flow is formed on the vertical surface of the moving direction of the wet paper web, water on the wet paper web can be sucked away along with the air flow through the suction holes, and the water evaporation rate of the surface of the wet paper web can be accelerated under the action of the air flow, and the acceleration of dehydration is realized.
In this embodiment, the pressure inside the suction box is controlled to be 30-40KPa. The dewatering efficiency is improved and the moisture content of the wet paper web is more conveniently controlled between 55 and 60% before it is fed to the drying cylinder, so that it is further ensured that the moisture content of the paper after drying in the drying cylinder is between 6.7 and 7.7%, and in this embodiment the pressure is 35KPa. The water content is 55%, and the water content of the paper is 7.2%; the water content of the wet paper web is controlled between 55 and 60 percent, so that the safety accident of fire caused by the too low water content of the wet paper web can be avoided.
Example 3
The ultra-low grammage paper production process differs from example 2 in that: in the pulping step, the addition amount of the pulping enzyme is 0.09kg/T;
in the pulping step, the addition amount of the wet strength agent is 14.0kg/T of the bamboo pulp, the pulping power is 48Kwh/T, the pulping power of hardwood pulp is 26Kwh/T, the wet weight of the bamboo pulp is 10.5g, and the beating degree is 29.0 DEG SR;
in the cylinder drying step, the water content of the paper was controlled to 7.2%.
Through the parameter control, the ultra-low grammage paper with high quality and weight of 11.5gsm is finally obtained, and the use requirement of a user can be met while the production cost is controlled.
The foregoing is merely exemplary of the present invention, and specific technical solutions and/or features that are well known in the art have not been described in detail herein. It should be noted that, for those skilled in the art, several variations and modifications can be made without departing from the technical solution of the present invention, and these should also be regarded as the protection scope of the present invention, which does not affect the effect of the implementation of the present invention and the practical applicability of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (10)
1. The production method of the ultralow grammage paper is characterized by comprising the following steps of:
selecting a mixture of bamboo pulp and wood pulp, wherein the bamboo pulp is sulfate bamboo pulp, and the wood pulp is hardwood pulp;
pulping, namely pulping the bamboo pulp and the wood pulp by different pulpers respectively, and performing slag removal procedures to refine the bamboo pulp and the wood pulp;
grinding, namely grinding the bamboo pulp and the wood pulp through a conical grinder respectively, so as to improve the bonding force between fibers;
mixing and stirring bamboo pulp and wood pulp according to a ratio of 3:2 to form bamboo-wood mixed pulp;
sizing, namely adding white water into the bamboo-wood mixed slurry for dilution;
making paper, namely feeding diluted bamboo-wood mixed pulp into a crescent former, and making paper to obtain a wet paper web;
drying the drying cylinder, and sending the wet paper web into the drying cylinder for drying to obtain paper;
and (3) wrinkling, namely wrinkling the paper by using a wrinkling alloy knife.
2. The method for producing ultra-low grammage paper according to claim 1, characterized in that: the surface of the wrinkling alloy blade, which is contacted with the paper, is a blade surface, the angle of the blade surface is 78 degrees, and the wrinkling rate of the wrinkling alloy blade on the paper is between 21.0 and 27.0 percent.
3. The method for producing ultra-low grammage paper according to claim 1, characterized in that: in the pulping step, the wet weight of the bamboo pulp is set to be 9.0-11.0g, and the beating degree is set to be 27.0-29.0 DEG SR.
4. The method for producing ultra-low grammage paper according to claim 3, characterized in that: the PH value of the white water is controlled between 7.5 and 8.1, and the concentration of the bamboo-wood mixed pulp after sizing and ending is 3.0 to 3.2 percent.
5. The method for producing ultra-low grammage paper according to claim 4, characterized in that: the pulping step also comprises the addition of an intensity agent, wherein the intensity agent comprises beating enzyme, and the dosage of the beating enzyme ranges from 0.06 kg/T to 0.1 kg/T.
6. The method for producing ultra-low grammage paper according to claim 5, characterized in that: the sizing step also comprises the addition of functional auxiliary agents, wherein the functional auxiliary agents comprise wet strength agents, and the dosage range of the wet strength agents is 11.0-15.0 kg/T.
7. The method for producing ultra-low grammage paper according to claim 1, characterized in that: the pulping and refining steps both include the addition of process aids including deposit control agents and alkali to achieve water recycling.
8. The method for producing ultra-low grammage paper according to claim 7, characterized in that: the drying step of the dryer also comprises a hot air cover and a boot pressure technology.
9. The method for producing ultra-low grammage paper according to any one of claims 1 to 8, characterized in that: the method also comprises a vacuum dehydration step, wherein the vacuum dehydration step comprises a suction box and a pipetting box.
10. The method for producing ultra-low grammage paper according to claim 9, characterized in that: the suction box and the suction box are controlled to have the internal pressure of 30-40KPa, so that the moisture content of the wet paper web is ensured to be 55-60% before the wet paper web is dried by the dryer.
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