CN114592380B - Seedling paper suitable for mechanized transplanting and preparation method thereof - Google Patents
Seedling paper suitable for mechanized transplanting and preparation method thereof Download PDFInfo
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- CN114592380B CN114592380B CN202210361542.6A CN202210361542A CN114592380B CN 114592380 B CN114592380 B CN 114592380B CN 202210361542 A CN202210361542 A CN 202210361542A CN 114592380 B CN114592380 B CN 114592380B
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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
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
- A01G9/02—Receptacles, e.g. flower-pots or boxes; Glasses for cultivating flowers
- A01G9/029—Receptacles for seedlings
- A01G9/0291—Planting receptacles specially adapted for remaining in the soil after planting
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- 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
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- 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
- D21D1/30—Disc mills
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- 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
- D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
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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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/62—Rosin; Derivatives thereof
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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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/66—Salts, e.g. alums
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- 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
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Environmental Sciences (AREA)
- Cultivation Receptacles Or Flower-Pots, Or Pots For Seedlings (AREA)
Abstract
The preparation method is suitable for preparing the seedling paper for mechanized sowing, all raw materials can be biodegraded, and the paper is green, environment-friendly and nuisanceless to the land. The invention also utilizes the leveling disc mill and the stretching device to increase the toughness of the paper and is more suitable for mechanized production. Experimental results show that the paper for seedling culture prepared by the preparation method has the tensile index of 58 N.m/g, the wet tensile index of 29 N.m/g, the air permeability of 3.5 Mm/(Pa.s), the longitudinal elongation of 7.0% and the transverse elongation of 7.0%.
Description
Technical Field
The invention belongs to the technical field of seedling culture, and particularly relates to seedling culture paper suitable for mechanized transplanting and a preparation method thereof.
Background
In the traditional seedling raising, both cutting seedlings and sowing seedlings have inherent defects. Because the seedbed is repeatedly used for many times and continuous cropping is frequent, the soil root-knot nematode is damaged. The sown seedlings are directly sown in the field, and thinning and grading processes are frequently pulled out and transplanted in the later period, so that the survival rate of seedlings is greatly influenced. As the seedling has only one main root, the root system is easy to be damaged when the seedling is lifted, and the seedling has no soil, and a long seedling revival period is needed after the seedling is transplanted. Later, people slowly changed the plastic nutrition bags as seedling raising paper to solve the problem of field seedling raising. Although the problems of continuous cropping and root breaking in the field are solved, the purchase cost of the plastic film is low, but a new problem is brought. Because the toughness of the plastic film is extremely strong, the root system can not penetrate through the film to grow out, bad root system conditions such as root nest and askew root are easily generated, the plastic film has poor air permeability, the plastic needs to be removed from a bag and transplanted during planting, the plastic needs to be recycled, the degradation time is long, and white pollution is generated to the environment.
The traditional mode of directly sowing and planting the beets in the field has the defects of low yield per unit area, low production efficiency, low utilization rate of cultivated land and the like. By adopting the beet paper tube seedling transplanting technology, the growth period of the beet can be prolonged by about 35 days, the effective accumulated temperature is increased, and the early maturity of crops is promoted; the paper tube seedling raising and transplanting technology is easy to raise strong seedlings, the paper tube seedlings transplanted with soil have strong capability of resisting natural disasters such as diseases, insects, wind, drought and the like, and the seedling protection rate can be obviously improved; the yield increasing effect is obvious, the input-output ratio is high, and the yield can be increased by 2 to 3 tons compared with that of direct seeding beet; the technology also has the advantages of simplicity, easy implementation, easy popularization and the like. The beet seedling-growing base paper is a production raw material of the beet seedling-growing paper cylinder, and because of the special purpose of the beet seedling-growing paper cylinder, besides considering the mechanical processing adaptability of the base paper, the beet seedling-growing base paper also has the following characteristics, such as good dry and wet strength, and the degradation period of the strength of the paper cylinder is less than 45 days, so that the paper cylinder is intact when the paper cylinder seedlings are transplanted; the device has good air permeability, water permeability, seedling side root penetrability, soil embracing property and the like, meets the growth requirement of beet crops, is suitable for a paper tube seedling and transplanting cultivation mode, is matched with a beet mechanical seedling and transplanting device for use, meets the use requirement of high-end customers, and caters to the development trend of modern agriculture.
Disclosure of Invention
The paper for seedling cultivation prepared by the preparation method provided by the invention has high tensile strength and good air permeability, is degradable and is beneficial to environmental protection.
The invention provides a preparation method of paper for seedling culture suitable for mechanized transplanting, which comprises the following steps:
a) Pulping unbleached needle leaf pulp and semi-chemical pulp by a hydrapulper, and pulping in a double-disc refiner to obtain pulped pulp;
b) After the pulped pulp passes through a pulping pool, adding 7.5-10 kg/ton of dispersed rosin gum and dispersed synthetic fiber pulp of absolute dry pulp into a pulp mixer, and pumping the mixture to a papermaking pulping pool to obtain mixed pulp;
the weight ratio of the dispersed synthetic fiber pulp to the unbleached needle-leaved pulp to the semi-chemical pulp is (15-25): (55-65): (15-25);
c) Treating the mixed slurry by using a leveling disc mill, namely, the beating degree of the mixed slurry reaches 42 DEG SR, then conveying the slurry with the beating degree of 42 DEG SR to a high-level box, adding 30-40 kg/ton of aluminum sulfate of the absolute dry slurry, feeding the slurry into a pressure screen after passing through a slag separator, and adding 65-85 kg/ton of urea-formaldehyde resin of the absolute dry slurry to obtain the prepared slurry;
d) Feeding the prepared pulp into a fourdrinier paper machine, and sequentially carrying out wire part dehydration forming, press part dehydration, front drying part water evaporation, paper machine extensibility device toughening and drying, and then supplementing further water evaporation to obtain dry paper;
e) And sequentially curling and rewinding the dried paper to obtain the paper for seedling culture suitable for mechanized transplanting.
Preferably, the semi-chemical pulp is one or more of straw semi-chemical pulp, wood chip semi-chemical pulp and reed semi-chemical pulp;
the mass concentration of the semi-chemical pulp is 85-95%.
Preferably, the mass concentration of the unbleached needle blade pulp is 85 to 95 percent.
Preferably, the beating degree in the step A) is 42-48 DEG SR; the wet weight of the pulped pulp is 4.0-5.0 g, and the concentration is 4.0-5.0%.
Preferably, the dispersed synthetic fiber slurry is prepared according to the following steps:
dispersing synthetic fibers in a solvent under a stirring condition to obtain dispersed synthetic fiber slurry;
the solvent is polyethylene oxide solution with the viscosity of 20-40 centipoises and/or polyacrylamide solution.
Preferably, the mass concentration of the dispersed synthetic fiber slurry is 1 to 1.5%.
Preferably, the synthetic fibers are polylactic acid fibers.
Preferably, the slag remover is a three-section slag remover.
Preferably, the wire part is dewatered and formed in the step D) until the dryness of the paper sheet is 20 percent; dewatering the press section to a sheet dryness of 40%; evaporating water before drying until the dryness of paper sheet is 25%; after drying, further water evaporation is carried out until the dryness of the paper sheet is 8%.
The invention provides the seedling paper suitable for mechanized transplanting, which is prepared by the preparation method.
The invention provides a preparation method of paper for seedling culture suitable for mechanized transplanting, which comprises the following steps: a) Pulping unbleached needle leaf pulp and semi-chemical pulp by a hydrapulper, and pulping in a double-disc refiner to obtain pulped pulp; b) After the pulped pulp passes through a pulp making tank, adding 7.5-10 kilograms of dispersed rosin gum and dispersed synthetic fiber pulp per ton of absolute dry pulp into a pulp mixer, and pumping to a pulp making tank to obtain mixed pulp; the weight ratio of the synthetic fiber to the unbleached needle pulp to the semi-chemical pulp is (15-25): (55-65): (15-25); c) Treating the mixed slurry by using a leveling disc mill, namely, the beating degree of the mixed slurry reaches 42 DEG SR, then conveying the slurry with the beating degree of 42 DEG SR to a high-level box, adding 30-40 kg/ton of aluminum sulfate of the absolute dry slurry, feeding the slurry into a pressure screen after passing through a slag separator, and adding 65-85 kg/ton of urea-formaldehyde resin of the absolute dry slurry to obtain the prepared slurry; d) Feeding the prepared pulp into a fourdrinier paper machine, and sequentially carrying out wire part forming, squeezing part dehydration, front drying part water evaporation, paper machine stretching device toughening and drying, and then supplementing further water evaporation to obtain dried paper; e) And sequentially curling and rewinding the dried paper to obtain the paper for seedling culture suitable for mechanized transplanting. The preparation method is suitable for preparing the seedling paper for mechanized sowing, all the raw materials can be biodegraded, and the paper is green, environment-friendly and nuisanceless to the land. The invention also utilizes the leveling disc mill and the stretching device to increase the toughness of the paper and is more suitable for mechanized production. Experimental results show that the paper for seedling culture prepared by the preparation method has the tensile index of 58 N.m/g, the wet tensile index of 29 N.m/g, the air permeability of 3.5 Mm/(Pa.s), the longitudinal elongation of 7.0% and the transverse elongation of 7.0%.
Detailed Description
The invention provides a preparation method of paper for seedling culture suitable for mechanized transplanting, which comprises the following steps:
a) Pulping unbleached needle leaf pulp and semi-chemical pulp by a hydrapulper, and pulping in a double-disc refiner to obtain pulped pulp;
b) After the pulped pulp passes through a pulp making tank, adding 7.5-10 kilograms of dispersed rosin gum and dispersed synthetic fiber pulp per ton of absolute dry pulp into a pulp mixer, and pumping to a pulp making tank to obtain mixed pulp;
the weight ratio of the synthetic fiber to the unbleached needle pulp to the semi-chemical pulp is (15-25): (55-65): (15-25);
c) Treating the mixed slurry by using a leveling disc mill, namely, the beating degree of the mixed slurry reaches 42 DEG SR, then conveying the slurry with the beating degree of 42 DEG SR to a high-level box, adding 30-40 kg/ton of aluminum sulfate of the absolute dry slurry, feeding the slurry into a pressure screen after passing through a slag separator, and adding 65-85 kg/ton of urea-formaldehyde resin of the absolute dry slurry to obtain the prepared slurry;
d) Feeding the prepared pulp into a fourdrinier paper machine, and sequentially carrying out wire part forming, squeezing part dehydration, front drying part water evaporation, paper machine stretching device toughening and drying, and then supplementing further water evaporation to obtain dried paper;
e) And sequentially curling and rewinding the dried paper to obtain the paper for seedling culture suitable for mechanized transplanting.
Unbleached needle leaf pulp and semi-chemical pulp are pulped by a hydrapulper, then conveyed to a primary pulp tank, and then pulped in a double-disc refiner to obtain pulped pulp.
In the invention, the semi-chemical pulp is preferably one or more of straw semi-chemical pulp, wood chip semi-chemical pulp and reed semi-chemical pulp; in the invention, the unbleached needle blade pulp and the semi-chemical pulp are air-dried pulp, the moisture content is 8-12%, and more preferably 10%, namely the mass concentration of the semi-chemical pulp is preferably 88-92%, and more preferably 90%; the mass concentration of the unbleached needle pulp is preferably 88 to 92%, and more preferably 90%.
In the present invention, the freeness is preferably 42 to 48 ° SR, such as 42 ° SR, 43 ° SR, 44 ° SR, 45 ° SR, 46 ° SR, 47 ° SR, 48 ° SR, and is preferably a range value having any of the above numerical values as an upper limit or a lower limit. The wet weight of the pulped pulp is preferably 4.0-5.0 g, such as 4.0g, 4.1g, 4.2g, 4.3g, 4.4g, 4.5g, 4.6g, 4.7g, 4.8g, 4.9g and 5.0g, and the wet weight is preferably a range value taking any value as an upper limit or a lower limit; the mass concentration of the pulped pulp is preferably 4.0 to 5.0%, such as 4.0%, 4.1%, 4.2%, 4.3%, 4.4%, 4.5%, 4.6%, 4.7%, 4.8%, 4.9%, 5.0%, and is preferably a range value in which any of the above values is an upper limit or a lower limit.
After the pulped pulp is obtained, the pulped pulp is conveyed to a pulp making tank, dispersed rosin glue and dispersed synthetic fiber pulp are added into a pulp mixer, and the mixture is pumped to a pulp making tank after being mixed.
In the invention, the weight ratio of the dispersed synthetic fiber pulp to the unbleached needle-leaved pulp to the semi-chemical pulp is (15-25): (55-65): (15-25); more preferably, the weight ratio of the synthetic fibers, unbleached needle pulp and semi-chemical pulp is 20:60:20.
in the present invention, the dispersed synthetic fiber slurry is preferably prepared according to the following steps:
firstly, dissolving polyethylene oxide or polyacrylamide in water to prepare a polyethylene oxide solution or a polyacrylamide solution with the mass concentration of 0.1-0.2%, and controlling the viscosity of the polyethylene oxide solution or the polyacrylamide solution to be 20-40 centipoises, wherein the viscosity is more preferably 25-35 centipoises. Then adding the synthetic fiber into the polyethylene oxide solution or the polyacrylamide solution under the condition of stirring to obtain the dispersed synthetic fiber slurry.
In the present invention, the synthetic fiber is preferably a polylactic acid fiber, and the synthetic fiber preferably has a D1.5 × 5mm gauge. The mass concentration of the dispersed synthetic fiber slurry is preferably 1 to 1.5%, such as 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, and is preferably a range of values having any of the above values as upper or lower limits.
In the present invention, the amount of the dispersed rosin size is preferably 7.5 to 10 kg/ton of oven dry pulp, more preferably 8 to 9 kg/ton of oven dry pulp, such as 7.5 kg/ton of oven dry pulp, 8 kg/ton of oven dry pulp, 8.5 kg/ton of oven dry pulp, 9 kg/ton of oven dry pulp, 9.5 kg/ton of oven dry pulp, 10 kg/ton of oven dry pulp, and preferably ranges in which any of the above values is an upper limit or a lower limit.
If the beating degree of the front end beating, namely the beating degree of the mixed pulp does not reach 42 DEG SR, the refining disc mill can be used for carrying out compensation beating, so that the beating degree reaches 42 DEG SR.
In the present invention, the refining concentration of the refiner disc mill is preferably 3 to 5%.
And then conveying the mixed slurry meeting the requirements to a high-level box, adding aluminum sulfate into the high-level box, feeding the mixed slurry into a pressure screen after passing through a slag separator, and adding urea-formaldehyde resin at an inlet of the pressure screen to obtain the prepared slurry.
In the present invention, the addition amount of the aluminum sulfate is preferably 30 to 40 kg/ton of oven dry pulp, such as 30 kg/ton of oven dry pulp, 31 kg/ton of oven dry pulp, 32 kg/ton of oven dry pulp, 33 kg/ton of oven dry pulp, 34 kg/ton of oven dry pulp, 35 kg/ton of oven dry pulp, 36 kg/ton of oven dry pulp, 37 kg/ton of oven dry pulp, 38 kg/ton of oven dry pulp, 39 kg/ton of oven dry pulp, 40 kg/ton of oven dry pulp, and preferably ranges in which any of the above values is an upper limit or a lower limit; the addition amount of the urea-formaldehyde resin is preferably 65-85 kg/ton of oven-dried pulp, such as 65 kg/ton of oven-dried pulp, 66 kg/ton of oven-dried pulp, 67 kg/ton of oven-dried pulp, 68 kg/ton of oven-dried pulp, 69 kg/ton of oven-dried pulp, 70 kg/ton of oven-dried pulp, 71 kg/ton of oven-dried pulp, 72 kg/ton of oven-dried pulp, 73 kg/ton of oven-dried pulp, 74 kg/ton of oven-dried pulp, 75 kg/ton of oven-dried pulp, 76 kg/ton of oven-dried pulp, 77 kg/ton of oven-dried pulp, 78 kg/ton of oven-dried pulp, 79 kg/ton of oven-dried pulp, and 80 kg/ton of oven-dried pulp, and preferably a range value taking any value of the above values as an upper limit or a lower limit.
In the present invention, the slag separator is preferably a three-stage slag separator.
After the prepared pulp is obtained, the pulp enters a fourdrinier paper machine for papermaking, and is sequentially subjected to cylinder part forming, press part dehydration, front part drying and water evaporation, and an extension device for increasing the toughness of the paper and further water evaporation after drying to obtain the dried paper.
And finally, sequentially curling, rewinding, packaging and warehousing the dried paper to obtain the seedling paper.
The invention also provides seedling paper which is prepared by the preparation method and is suitable for mechanized transplanting, and the seedling paper has excellent physical property, absorption property, surface property and appearance quality. The physical properties are mainly mechanical strength indexes, such as higher tensile strength, and the requirements of the paper tube on the tensile action in use and processing engineering are met; the paper tube has certain wet tensile strength, so that the paper tube can still maintain certain strength in wet bed soil; the absorption performance is mainly to endow the base paper with hydrophobic performance, delay the process that the paper cylinder absorbs water in soil and reduce the degradation speed of the strength of the paper cylinder; the tightness and air permeability indexes of the base paper need to be considered comprehensively, so that the tightness is improved, and the air permeability indexes of the base paper are considered simultaneously, so as to meet the requirements of air permeability and water permeability of the paper tube and the penetrability of Miao Cegen; meanwhile, the banner quantitative difference and the appearance quality of the base paper are controlled to ensure the processing precision of the paper tube and meet the mechanical seedling requirement of the paper tube.
The invention provides a preparation method of paper for seedling culture suitable for mechanized transplanting, which comprises the following steps: a) Pulping unbleached needle leaf pulp and semi-chemical pulp by a hydrapulper, and pulping in a double-disc refiner to obtain pulped pulp; b) After the pulped pulp passes through a pulp making tank, adding 7.5-10 kilograms of dispersed rosin gum and dispersed synthetic fiber pulp per ton of absolute dry pulp into a pulp mixer, and pumping to a pulp making tank to obtain mixed pulp; the weight ratio of the synthetic fiber to the unbleached needle pulp to the semi-chemical pulp is (15-25): (55-65): (15-25); c) Treating the mixed slurry by using a leveling disc mill, namely, conveying the slurry with the beating degree of 42 DEG SR to a high-level box, adding 30-40 kg/ton of aluminum sulfate of the oven-dried slurry, feeding the slurry into a pressure screen after passing through a slag separator, and adding 65-85 kg/ton of urea-formaldehyde resin of the oven-dried slurry to obtain the prepared slurry; d) Feeding the prepared pulp into a fourdrinier paper machine, and sequentially carrying out wire part forming, squeezing part dehydration, front drying part water evaporation, paper machine stretching device toughening and drying, and then supplementing further water evaporation to obtain dried paper; e) And sequentially curling and rewinding the dried paper to obtain the paper for seedling culture suitable for mechanized transplanting. The preparation method is suitable for preparing the seedling paper for mechanized sowing, all the raw materials can be biodegraded, and the paper is green, environment-friendly and nuisanceless to the land. The invention also utilizes the leveling disc mill and the stretching device to increase the toughness of the paper and is more suitable for mechanized production. Experimental results show that the paper for seedling culture prepared by the preparation method has the tensile index of 58 N.m/g, the wet tensile index of 29 N.m/g, the air permeability of 3.5 Mm/(Pa.s), the longitudinal elongation of 7.0% and the transverse elongation of 7.0%.
In order to further illustrate the present invention, the following will describe in detail a paper for seedling cultivation suitable for mechanized transplanting and a preparation method thereof, which are provided by the present invention, with reference to the following examples, but should not be construed as limiting the scope of the present invention.
Example 1
Mixing unbleached needle leaf pulp and straw semi-chemical pulp according to a weight ratio of 60 to 20, pulping in a double-disc refiner after being pulped by a hydrapulper, wherein the pulping degree is 45 DEG SR, the wet weight is 4.0g, and the pulping concentration is 4.5%.
After the pulped pulp passes through a pulp making tank, 8 kilograms of dispersed rosin size/ton of absolute dry pulp and 20 percent of dispersed synthetic fiber pulp by weight are added into a pulp mixer, and the mixture is pumped to a pulp making tank;
and when the beating degree of the mixed pulp is lower than 42 DEG SR, the mixed pulp is processed by a leveling disc mill in front of a paper machine to reach 42 DEG SR, so that the mixed pulp is suitable for papermaking by a fourdrinier machine.
The slurry meeting the requirement is pumped to a high-level tank, 30 kg of aluminum sulfate per ton of oven dry slurry is added into the high-level tank, the slurry is pumped to a three-section slag separator and a pressure screen, and 75 kg of urea resin per ton of oven dry slurry is added at the inlet of the pressure screen.
The prepared pulp is formed by a wire part of a fourdrinier paper machine, dewatered by a pressing part, evaporated moisture at the front part of drying, and further evaporated moisture at the rear part of drying. And finally, sequentially curling, rewinding, packaging and warehousing the dried paper to obtain the seedling paper.
The prepared seedling paper has the indexes shown in table 1.
Example 2
Mixing unbleached needle leaf pulp and straw semi-chemical pulp according to a weight ratio of 70.
After the pulped pulp passes through a pulping pool, 8 kilograms of dispersed rosin size/ton of absolute dry pulp and 15 weight percent of dispersed synthetic fiber pulp are added into a pulp mixer, and the mixture is pumped to a pulping pool;
and when the beating degree of the mixed pulp is lower than 42 DEG SR, the mixed pulp is processed by a leveling disc mill in front of a paper machine to reach 42 DEG SR, so that the mixed pulp is suitable for papermaking by a fourdrinier machine.
And pumping the slurry meeting the requirements to a high-level box, adding 30 kg of aluminum sulfate per ton of oven-dried slurry into the high-level box, pumping the slurry to a three-section slag separator and a pressure screen, and adding 80 kg of urea-formaldehyde resin per ton of oven-dried slurry into an inlet of the pressure screen.
The prepared pulp is formed through a wire part of a fourdrinier machine, dewatered through a pressing part, evaporated water at the front part of drying, and further evaporated water at the rear part of drying, and the toughness of paper is increased through an extending device. And finally, sequentially curling, rewinding, packaging and warehousing the dried paper to obtain the seedling paper.
The prepared seedling paper has the indexes shown in table 1.
Example 3
Unbleached needle leaf pulp and straw semi-chemical pulp are mixed according to the weight ratio of 50 to 25, and are pulped in a double-disc refiner after being pulped by a hydropulper, the pulping degree is 45 DEG SR, the wet weight is 3.8g, and the pulping concentration is 4.5%.
After the pulped pulp passes through a pulping pool, 8 kilograms of dispersed rosin size/ton of absolute dry pulp and 25 percent of dispersed synthetic fiber pulp by weight are added into a pulp mixer, and the mixture is pumped to a pulping pool;
and when the beating degree of the mixed pulp is lower than 42 DEG SR, the mixed pulp is processed by a leveling disc mill in front of a paper machine to reach 42 DEG SR, so that the mixed pulp is suitable for papermaking by a fourdrinier machine.
The slurry meeting the requirement is pumped to a high-level tank, 30 kg of aluminum sulfate per ton of oven dry slurry is added into the high-level tank, the slurry is pumped to a three-section slag separator and a pressure screen, and 70 kg of urea resin per ton of oven dry slurry is added at the inlet of the pressure screen.
The prepared pulp is formed by a wire part of a fourdrinier paper machine, dewatered by a pressing part, evaporated moisture at the front part of drying, and further evaporated moisture at the rear part of drying. And finally, sequentially curling, rewinding, packaging and warehousing the dried paper to obtain the seedling paper.
The prepared seedling paper has the indexes shown in table 1.
Comparative example 1
Dacron with the D of 1.5 multiplied by 5mm, unbleached needle leaf pulp and waste newspaper are pulped by a hydropulper according to the weight ratio of 25 to 60 and then are pulped in a double-disc refiner, wherein the pulping degree is 42 DEG SR, the wet weight is 5g, and the pulping concentration is 4.5%.
After the pulped pulp passes through a pulp forming tank, 8 kilograms of dispersed rosin size per ton of absolute dry pulp are added into a pulp mixer, the mixture is pumped to a papermaking pulp tank, and then 30 kilograms of aluminum sulfate per ton of absolute dry pulp are added into the papermaking pulp tank;
pumping the slurry to a high-level box, adding 70 kg/ton of urea-formaldehyde resin absolute dry slurry, and pumping to a three-section slag remover and a circular sieve;
and finally, sequentially curling, rewinding, packaging and warehousing the dried paper to obtain the seedling paper.
TABLE 1 index of seedling paper in examples 1 to 3 of the present invention
As can be seen from Table 1, the seedling paper of the present invention has better tensile strength, is more suitable for the requirements on the tensile action in the mechanized transplanting and seedling raising, has higher wet tensile strength, can improve the strength of the paper tube in the moist bed soil, is air-permeable and water-permeable, and can meet higher processing precision.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. The preparation method of the paper for seedling culture suitable for mechanized transplanting comprises the following steps:
a) Pulping unbleached needle leaf pulp and semi-chemical pulp by a hydrapulper, and pulping in a double-disc refiner, wherein the pulping degree is 45-48 DEG SR, so as to obtain pulped pulp, and the wet weight of the pulped pulp is 4.0-5.0 g, and the concentration is 4.0-5.0%;
b) After the pulped pulp passes through a pulping pool, adding 7.5-10 kg/ton of dispersed rosin gum and dispersed synthetic fiber pulp of absolute dry pulp into a pulp mixer, and pumping the mixture to a papermaking pulping pool to obtain mixed pulp;
the dispersed synthetic fiber slurry is prepared according to the following steps: dispersing polylactic acid fiber in a solvent under the stirring condition to obtain dispersed synthetic fiber slurry with the mass concentration of 1-1.5%;
the solvent is polyethylene oxide solution and/or polyacrylamide solution with the viscosity of 20-40 centipoises;
the weight ratio of the dispersed synthetic fiber pulp to the unbleached needle-leaved pulp to the semi-chemical pulp is (15-25): (55-65): (15-25);
c) Treating the mixed slurry by using a leveling disc mill, namely, the beating degree of the mixed slurry reaches 42 DEG SR, then conveying the slurry with the beating degree of 42 DEG SR to a high-level box, adding 30-40 kg/ton of aluminum sulfate of the absolute dry slurry, feeding the slurry into a pressure screen after passing through a slag separator, and adding 65-85 kg/ton of urea-formaldehyde resin of the absolute dry slurry to obtain the prepared slurry;
d) Feeding the prepared pulp into a fourdrinier paper machine, and sequentially carrying out wire part dehydration forming, press part dehydration, water evaporation at the front part of drying, toughening by a paper machine stretching device, drying and then supplementing further water evaporation to obtain dried paper;
e) And sequentially curling and rewinding the dried paper to obtain the paper for seedling cultivation suitable for mechanized transplanting.
2. The preparation method of claim 1, wherein the semi-chemical pulp is one or more of straw semi-chemical pulp, wood chip semi-chemical pulp and reed semi-chemical pulp;
the mass concentration of the semi-chemical pulp is 88-92%.
3. The method according to claim 2, wherein the unbleached needle pulp has a mass concentration of 88 to 92%.
4. The method of claim 1, wherein the slag separator is a three-stage slag separator.
5. The method of claim 1, wherein in step D), the wire is dewatered and formed to a sheet dryness of 20%; dewatering in the press section to a sheet dryness of 40%; evaporating water before drying until the dryness of the paper sheet is 25%; after drying, further evaporating water until the dryness of the paper sheet is 8 percent.
6. A paper for seedling culture suitable for mechanized transplanting, which is prepared by the preparation method according to any one of claims 1 to 5.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| NL110990C (en) * | 1957-07-27 | |||
| FR2540152B1 (en) * | 1983-01-31 | 1986-11-21 | Gascogne Papeteries | PROCESS FOR THE PREPARATION OF A SHEET OF PAPER HAVING IMPROVED MECHANICAL PROPERTIES, USEFUL IN THE FIELD OF PACKAGING AND PARTICULARLY THAT OF BAGS, AND SHEET OF PAPER OBTAINED ACCORDING TO THIS PROCESS |
| JP5057319B2 (en) * | 2005-06-08 | 2012-10-24 | 王子製紙株式会社 | Paper for seedling transplanting pot |
| CN102190773A (en) * | 2010-03-11 | 2011-09-21 | 段全义 | Preparation method of urea-formaldehyde resin wet strength agent for papermaking |
| CN103774488A (en) * | 2014-02-28 | 2014-05-07 | 陕西科技大学 | Method for preparing high-air-permeability fruit cultivation bagging paper |
| CN105625087B (en) * | 2015-12-22 | 2017-09-29 | 嘉兴学院 | Warm nursery paper and preparation method thereof |
| CN105780590A (en) * | 2016-03-07 | 2016-07-20 | 上海渊泉集币收藏品有限公司 | Silver-loaded antibacterial paper and preparing method thereof |
| CN107173109A (en) * | 2017-06-19 | 2017-09-19 | 安徽春生农业科技有限公司 | A kind of method that warm nursery paper is prepared by acid fiber by polylactic |
| JP7032066B2 (en) * | 2017-07-07 | 2022-03-08 | 王子ホールディングス株式会社 | Vegetable seedling paper and how to use it |
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