CN112482066A - Method for producing degradable seedling paper container by using fir leftover and branch pulp - Google Patents
Method for producing degradable seedling paper container by using fir leftover and branch pulp Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 50
- 238000004537 pulping Methods 0.000 claims abstract description 36
- 238000007493 shaping process Methods 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000002994 raw material Substances 0.000 claims abstract description 26
- 238000002156 mixing Methods 0.000 claims abstract description 20
- 239000000835 fiber Substances 0.000 claims abstract description 19
- 239000002023 wood Substances 0.000 claims abstract description 19
- 244000050510 Cunninghamia lanceolata Species 0.000 claims abstract description 17
- 238000007731 hot pressing Methods 0.000 claims abstract description 17
- 238000005086 pumping Methods 0.000 claims abstract description 15
- 238000003825 pressing Methods 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 11
- 230000006835 compression Effects 0.000 claims abstract description 7
- 238000007906 compression Methods 0.000 claims abstract description 7
- 238000004806 packaging method and process Methods 0.000 claims abstract description 7
- 238000012216 screening Methods 0.000 claims description 48
- 238000005406 washing Methods 0.000 claims description 42
- 238000000034 method Methods 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 18
- 239000002893 slag Substances 0.000 claims description 18
- 229920001131 Pulp (paper) Polymers 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 13
- 238000010009 beating Methods 0.000 claims description 11
- 238000005507 spraying Methods 0.000 claims description 9
- 238000010025 steaming Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 229920002472 Starch Polymers 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 6
- 230000014759 maintenance of location Effects 0.000 claims description 6
- 230000007935 neutral effect Effects 0.000 claims description 6
- 235000019698 starch Nutrition 0.000 claims description 6
- 239000008107 starch Substances 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 2
- 238000009740 moulding (composite fabrication) Methods 0.000 abstract 2
- 229920002522 Wood fibre Polymers 0.000 abstract 1
- 239000002025 wood fiber Substances 0.000 abstract 1
- 239000000123 paper Substances 0.000 description 44
- 238000010411 cooking Methods 0.000 description 12
- 239000002609 medium Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 238000004321 preservation Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000010893 paper waste Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000001963 growth medium Substances 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000011088 parchment paper Substances 0.000 description 1
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- 241000894007 species Species 0.000 description 1
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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
- D21D1/02—Methods of beating; Beaters of the Hollander type
-
- 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
-
- 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
- D21B1/06—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C7/00—Digesters
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J3/00—Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds
-
- 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
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Cultivation Receptacles Or Flower-Pots, Or Pots For Seedlings (AREA)
- Paper (AREA)
Abstract
The invention provides a method for producing degradable seedling paper containers by using Chinese fir leftover materials and branch material pulp, which is produced by pulping, concentrating, pulping at medium concentration, mixing pulp, adjusting concentration, forming, drying, hot-pressing and shaping and packaging, wherein 100 percent of Chinese fir fiber pulp is used, the Chinese fir fiber pulp is subjected to pulping by a 5-6 percent medium concentration disc mill, mixing pulp, adjusting the pH value to 6.5-7.5, adding water to adjust the concentration to 0.8-1.2 percent, pumping the concentrated pulp to a forming machine for wet-pressing and shaping, and the wet-pressed and shaped containers are dried by a drying machine and then sent to a hot-pressing shaping machine for shaping; the obtained seedling paper container has a material ration of 250‑260g/m2The dryness is 7-8 percent, the cup body stiffness is 3.5-3.8N, and the compression resistance is 300-350N; the product is soaked in water at 60 deg.C for 30min without leakage. The invention takes fir leftover materials and branch wood fibers as raw materials, thereby not only expanding the raw material source of the seedling paper container and relieving the situation of insufficient supply of raw wood, but also improving the performance of the seedling paper container to a certain extent.
Description
Technical Field
The invention relates to the technical field of pulping and papermaking, in particular to a method for producing a degradable seedling paper container by utilizing fir leftover materials and branch material pulp.
Background
The seedling raising container is used for containing soil, nutrient solution and other culture medium bearing matter during seedling raising activity and mainly comprises a seedling raising tray, a seedling raising cup and other products. Most of seedling raising trays and seedling raising cups which are popular in the market are plastic products, and the environment is greatly harmed by large-scale long-term use. A small amount of seedling raising tray and seedling raising cup products are made of paper materials, wherein waste paper pulp with poor quality is used as a raw material, but the waste paper pulp contains a large amount of microorganisms which are harmful to human bodies, animals and plants; the high-quality raw wood pulp is prepared from raw wood pulp, but a large amount of raw wood resources are consumed every year, so that the raw wood pulp is not beneficial to large-scale popularization and application. In addition, the paper container for growing seedlings prepared by the conventional process needs to be improved in the aspects of air permeability, light resistance, heat resistance and the like.
Cunninghamia lanceolata is a tree species which is the most widely cultivated, fast growing and high in economic value in the Yangtze river basin and the areas south of Qinling mountains. The fir raw material belongs to needle-leaved wood, has long fiber, larger length-width ratio, higher lignin content, difficult devillicate brooming and good paper-making strength, and is an excellent papermaking fiber raw material. However, the impurities of the fir leftover materials and the branch materials are more, the pulp yield is lower than that of the formed material, and the quality is greatly influenced when the pulp is used for paper making of paper varieties with higher requirements on the appearance and the strength of the formed paper, so that the pulp is not applied on a large scale all the time. The requirements of the seedling paper support and the seedling paper cup on appearance and strength are not very high, but rather certain soil adaptability is required, and the seedling paper support and the seedling paper cup produced by the pulp made of fir leftover materials and branch materials can completely meet the requirements.
The fir can be used as raw materials for buildings, bridges, shipbuilding, ore columns, timber piles, furniture and the like. Every year, processing plants and felling mountain and forest lands have a great deal of leftover materials and branch material wastes which can only be incinerated, and even a great deal of leftover materials and branch material wastes are accumulated in the felled mountain and forest lands, so that a great fire danger exists. Under the condition, if paper seedling culture containers such as seedling culture paper holders, seedling culture paper cups and the like can be produced by pulping waste fir leftover materials and branch materials, the method is a sustainable scheme which is selected from agriculture and agriculture, and is beneficial to maintaining the integral ecological balance while reducing plastic pollution.
Disclosure of Invention
The invention aims to overcome the technical defects in the prior art and provides a method for producing a degradable seedling paper container by using fir leftover materials and branch material pulp so as to solve the technical problem that the raw material source of the seedling paper container is limited.
The invention also aims to solve the technical problem that the seedling paper container product prepared by the conventional process needs to be improved in performance.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a process for preparing the degradable paper container used for growing seedlings from the leftover and branch pulp of China fir includes such steps as pulping, concentrating, beating in medium concentration, mixing, concentrating, shaping, baking, hot pressing for shaping and packing, and includes such steps as beating by 5-6% medium concentration disc mill, regulating pH value to 6.5-7.5, adding water to regulate concentration to 0.8-1.2%, pumping the concentrated pulp to shaping machine for wet pressing, baking and shaping.
Preferably, the method comprises the steps of:
1) pulping: comprises the steps of material selection, crushing, screening, liquid adding, steaming, pulp washing, pulp screening and pulp manufacturing;
2) concentration: concentrating the fir pulp by using a vacuum concentrator;
3) pulping: pulping at medium concentration of 5-6%, wherein the beating degree after pulping is 35-40 DEG SR;
4) size mixing: adding reinforced starch, retention aid, wet strength agent and neutral glue, and adjusting the pH value to 6.5-7.5;
5) concentration adjustment: adding water to adjust the concentration to 0.8-1.2%;
6) molding: pumping the concentrated slurry to a forming machine for wet pressing and forming;
7) and (3) drying: placing the wet-pressed container in a dryer for drying;
8) hot-pressing and shaping: setting a shaping temperature, and sending the dried container into a hot-pressing shaping machine for shaping;
9) and (6) packaging.
Preferably, the setting temperature is 200-210 ℃.
Preferably, step 1) comprises the steps of:
A. selecting materials: selecting fir leftover materials and branch materials as raw materials (preferably selecting parts with low impurity content);
B. crushing: crushing the raw materials (to make the raw materials meet the specification of the process requirement);
C. screening: selecting fir wood chips with the length of 10-50mm as a raw material for pulping;
D. liquid adding: proportionally mixing the pulp with the washing liquid after washing the pulp, and mixing and stirring the pulp and the fir chips;
E. steaming: gradually adding steam into the digester to a set temperature, keeping the temperature for 60min, and then putting into a spraying pot;
F. washing the pulp: pumping the steamed fir pulp to a pulp washer for vacuum pulp washing;
G. screening pulp: the method comprises the steps of screening pulp for the first time and screening pulp for the second time, screening out slag contained in the fir wood pulp by a slag washing machine for the second time, crushing the slag by a disc mill, and repeatedly carrying out pulp washing and pulp screening;
H. manufacturing paper: and (5) making paper by using the obtained fir wood pulp.
Preferably, the proportion in the liquid adding step refers to the weight ratio of the total amount of the added alkali liquor and the washing liquid to the water of 1:4, wherein the water content of the fir chips is 46%.
Preferably, the fibrils are retained during step 1).
Preferably, the steaming process comprises: increasing the temperature from 70 ℃ to 120 ℃ by adding steam for 70 min; raising the temperature from 120 ℃ to 130 ℃ for 35 min; raising the temperature from 130 ℃ to 168 ℃ for 90 min; the holding time is 60 min.
Preferably, the raw material in step A comprises bark, leaves and knots of Chinese fir.
Preferably, the seedling paper container is a seedling paper support or a seedling paper cup.
As a preferenceThe quantitative quantity of the material of the obtained seedling paper container is 250-260g/m2The dryness is 7-8 percent, the cup body stiffness is 3.5-3.8N, and the compression resistance is 300-350N; the product is soaked in water at 60 deg.C for 30min without leakage. Taking the specification of 3.5X 5cm as an example, the weight of the single product is 2.08-2.15 g.
The invention provides a method for producing a degradable seedling paper container by utilizing fir leftover materials and branch material pulp. The technical scheme takes fir leftover materials and branch material fibers as raw materials, and produces the environment-friendly and degradable seedling paper container through the improvement of a production process. Not only expands the raw material source of the seedling paper container, but also relieves the situation of insufficient supply of the primary wood to a certain extent.
The technical advantages of the invention are focused on the following aspects:
(1) raw wood pulp is changed into leftover material and wood pulp, so that the source of the raw material is widened, and the situation of insufficient supply of raw wood is solved;
(2) due to the characteristics of the fir pulp and the change of the pulping process, the produced seedling paper containers such as seedling paper supports, seedling paper cups and the like have greatly improved air permeability and good light resistance and heat resistance. The product has smooth and beautiful appearance;
(3) accords with the national concept of green ecological economic development and is beneficial to the coordinated development of ecological environmental protection and market economy.
Drawings
FIG. 1 is a process flow chart of the present invention for producing a seedling paper container.
FIG. 2 is a flow chart of the process for preparing fir pulp in the present invention.
Detailed Description
Hereinafter, specific embodiments of the present invention will be described in detail. Well-known structures or functions may not be described in detail in the following embodiments in order to avoid unnecessarily obscuring the details. Approximating language, as used herein in the following examples, may be applied to identify quantitative representations that could permissibly vary in number without resulting in a change in the basic function. Unless defined otherwise, technical and scientific terms used in the following examples have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
A process for preparing the degradable paper container used for growing seedlings from the leftover and branch pulp of China fir includes such steps as pulping, concentrating, beating in medium concentration, mixing, concentrating, shaping, baking, hot pressing for fixating shape, and packing, and includes such steps as beating with 100% China fir fibre pulp in 5-6% medium concentration disc mill, regulating pH value to 6.5-7.5, adding water to regulate concentration to 0.8-1.2%, pumping the concentrated pulp to shaping machine for wet pressing, baking paper cup, and shaping. The weight of the obtained 3.5X 5 seedling raising cup is 2.08-2.15g, and the quantitative weight is 250-2The dryness is 7-8 percent, the cup body stiffness is 3.5-3.8N, and the compression resistance is 300-350N; the product is soaked in water at 60 deg.C for 30min without leakage.
The method specifically comprises the following steps:
(1) pulping: comprises the steps of material selection, crushing, screening, liquid adding, steaming, pulp washing and pulp screening;
(2) concentration: concentrating the fir pulp by using a vacuum concentrator;
(3) pulping: pulping at medium concentration of 5-6%, and beating to obtain SR at 35-40 deg;
(4) size mixing: adding reinforced starch, retention aid, neutral glue and wet strength agent, and adjusting the pH value to 6.5-7.5;
(5) concentration adjustment: adding water to adjust the concentration to 0.8-1.2%;
(6) molding: pumping the concentrated slurry to a forming machine for wet pressing and forming;
(7) and (3) drying: placing the paper cup formed by wet pressing in a dryer for drying;
(8) hot-pressing and shaping: setting a setting temperature, and sending the dried paper cup into a hot-pressing shaping machine for setting;
(9) and (6) packaging.
Wherein, the setting temperature is as follows: 200 ℃ and 210 ℃.
Wherein, the specific process of pulping in the step (1) comprises the following steps:
A. selecting materials: selecting bark, leaves, knots and other Chinese fir leftover materials and twigs with low impurity content as raw materials;
B. crushing: crushing the raw materials to prepare the raw materials meeting the specification of the process requirement;
C. screening: selecting fir wood chips with the length of 10-50mm as a raw material for pulping;
D. liquid adding: proportionally mixing the pulp with the washing liquid after washing the pulp, and mixing and stirring the pulp and the fir chips;
E. steaming: gradually adding steam into the digester to a set temperature, keeping the temperature for 60min, and then putting into a spraying pot;
F. washing the pulp: pumping the steamed fir pulp to a pulp washer for vacuum pulp washing;
G. screening pulp: the method comprises the steps of screening pulp for the first time and screening pulp for the second time, screening out slag contained in the fir wood pulp by a slag washing machine for the second time, crushing the slag by a disc mill, and repeatedly carrying out pulp washing and pulp screening;
H. manufacturing paper: and (5) making the obtained fir wood pulp.
Wherein, the proportion in the step of adding liquid refers to the weight ratio of the total amount of the added liquid and the washing liquid to the water of 1:4, wherein the water content of the fir wood chips accounts for 46 percent.
Wherein the steaming process comprises: increasing the temperature from 70 ℃ to 120 ℃ by adding steam for 70 min; raising the temperature from 120 ℃ to 130 ℃ for 35 min; raising the temperature from 130 ℃ to 168 ℃ for 90 min; the holding time is 60 min.
Example 1
As shown in fig. 1, fig. 2, table 1: selecting low-price and wide-source Chinese fir leftover materials and branch materials of a wood processing factory as basic raw materials of Chinese fir pulp; crushing and screening qualified fir wood chips with the thickness of 10-50mm, and then putting the fir wood chips into a cooking pot for cooking; before cooking, the weight ratio of the additive to water is 1:4, mixing and stirring the washing liquid after the pulp washing with fir chips, wherein the water content of the fir chips is 46 percent; gradually adding steam to a set temperature in the cooking pan, wherein the change process and time of the intermediate temperature comprise: increasing the temperature from 70 ℃ to 120 ℃ by adding steam for 70 min; raising the temperature from 120 ℃ to 130 ℃ for 35 min; raising the temperature from 130 ℃ to 168 ℃ for 90 min; the heat preservation time is 60 min; after heat preservation, spraying the mixture into a spraying pot; pumping the steamed fir pulp to a pulp washer for vacuum pulp washing; after pulp washing, pulp screening is carried out, wherein the pulp screening comprises primary pulp screening and secondary pulp screening, the secondary pulp screening is used for screening out slag contained in the fir wood pulp by a slag washing machine, the slag is crushed by a disc mill, and pulp washing and pulp screening are repeated; and finally, manufacturing the obtained fir pulp by papermaking.
Concentrating the fir pulp by using a vacuum concentrator; the fir pulp fiber is longer, but the branch material fiber is relatively shorter, the fine fiber is more, the seedling raising paper cup requires certain air permeability, the surface cannot be too smooth, the fiber can only be cut off properly during pulping, medium-concentration pulping is adopted, 5% -6% medium-concentration pulping is adopted, and the beating degree is 35 DEG SR after pulping; adding auxiliary materials such as reinforced starch, retention aid, wet strength agent, neutral glue and the like into the fir pulp, stirring and mixing the pulp, and adjusting the pH value to 6.5; then, adding water to adjust the concentration to 0.82%; pumping the concentrated pulp to a forming machine for wet pressing and forming, and feeding the paper cup subjected to wet pressing and forming into a dryer for drying; and then sending the mixture to a hot-pressing shaping machine for hot-pressing shaping, and setting the shaping temperature: 200 ℃ and 210 ℃; and finally, packaging. The obtained paper cup weighed 2.09g, and the quantitative rate was 251g/m2The dryness is 7.1 percent, the strength of the cup body is 3.75N, the compression resistance is 310N, and the cup is not leaked after being soaked in water at the temperature of 60 ℃ for 30 min.
Example 2
As shown in fig. 1, fig. 2, table 1: selecting low-price and wide-source Chinese fir leftover materials and branch materials of a wood processing factory as basic raw materials of Chinese fir pulp; crushing and screening qualified fir wood chips with the thickness of 10-50mm, and then putting the fir wood chips into a cooking pot for cooking; before cooking, the weight ratio of the additive to water is 1:4, mixing and stirring the washing liquid after the pulp washing with fir chips, wherein the water content of the fir chips is 46 percent; gradually adding steam to a set temperature in the cooking pan, wherein the change process and time of the intermediate temperature comprise: increasing the temperature from 70 ℃ to 120 ℃ by adding steam for 70 min; raising the temperature from 120 ℃ to 130 ℃ for 35 min; raising the temperature from 130 ℃ to 168 ℃ for 90 min; the heat preservation time is 60 min; after heat preservation, spraying the mixture into a spraying pot; pumping the steamed fir pulp to a pulp washer for vacuum pulp washing; after pulp washing, pulp screening is carried out, wherein the pulp screening comprises primary pulp screening and secondary pulp screening, the secondary pulp screening is used for screening out slag contained in the fir wood pulp by a slag washing machine, the slag is crushed by a disc mill, and pulp washing and pulp screening are repeated; and finally, manufacturing the obtained fir pulp by papermaking.
Concentrating the fir pulp by using a vacuum concentrator; the fir pulp fiber is longer, but the branch material fiber is relatively shorter, the fine fiber is more, the seedling raising paper cup requires certain air permeability, the surface cannot be too smooth, the fiber can only be cut off properly during pulping, medium-concentration pulping is adopted, 5% -6% medium-concentration pulping is adopted, and the beating degree is 37 DEG SR after pulping; adding auxiliary materials such as reinforced starch, retention aid, wet strength agent, neutral glue and the like into the fir pulp, stirring and mixing the pulp, and adjusting the pH value to 6.7; then, adding water to adjust the concentration to 0.93%; pumping the concentrated pulp to a forming machine for wet pressing and forming, and feeding the paper cup subjected to wet pressing and forming into a dryer for drying; and then sending the mixture to a hot-pressing shaping machine for hot-pressing shaping, and setting the shaping temperature: 200 ℃ and 210 ℃; and finally, packaging. The obtained paper cup has a weight of 2.12g and a quantitative content of 254g/m2The dryness is 7.5 percent, the strength of the cup body is 3.71N, the compression resistance is 315N, and the cup is not leaked after being soaked in water at the temperature of 60 ℃ for 30 min.
Example 3
As shown in fig. 1, fig. 2, table 1: selecting low-price and wide-source Chinese fir leftover materials and branch materials of a wood processing factory as basic raw materials of Chinese fir pulp; crushing and screening qualified fir wood chips with the thickness of 10-50mm, and then putting the fir wood chips into a cooking pot for cooking; before cooking, the weight ratio of the additive to water is 1:4, mixing and stirring the washing liquid after the pulp washing with fir chips, wherein the water content of the fir chips is 46 percent; gradually adding steam to a set temperature in the cooking pan, wherein the change process and time of the intermediate temperature comprise: increasing the temperature from 70 ℃ to 120 ℃ by adding steam for 70 min; raising the temperature from 120 ℃ to 130 ℃ for 35 min; raising the temperature from 130 ℃ to 168 ℃ for 90 min; the heat preservation time is 60 min; after heat preservation, spraying the mixture into a spraying pot; pumping the steamed fir pulp to a pulp washer for vacuum pulp washing; after pulp washing, pulp screening is carried out, wherein the pulp screening comprises primary pulp screening and secondary pulp screening, the secondary pulp screening is used for screening out slag contained in the fir wood pulp by a slag washing machine, the slag is crushed by a disc mill, and pulp washing and pulp screening are repeated; and finally, manufacturing the obtained fir pulp by papermaking.
Concentrating the fir pulp by using a vacuum concentrator; the fir pulp fiber is longer, but the branch material fiber is relatively shorter, the fine fiber is more, the seedling raising paper cup requires certain air permeability, the surface cannot be too smooth, the fiber can only be cut properly during pulping, medium-concentration pulping is adopted, 5% -6% medium-concentration pulping is adopted, and the beating degree is 38 DEG SR after pulping; adding auxiliary materials such as reinforced starch, retention aid, wet strength agent, neutral glue and the like into the fir pulp, stirring and mixing the pulp, and adjusting the pH value to 7.1; then, adding water to adjust the concentration to 1.05%; pumping the concentrated pulp to a forming machine for wet pressing and forming, and feeding the paper cup subjected to wet pressing and forming into a dryer for drying; and then sending the mixture to a hot-pressing shaping machine for hot-pressing shaping, and setting the shaping temperature: 200 ℃ and 210 ℃; and finally, packaging. The obtained paper cup has a weight of 2.13g and a quantitative content of 256g/m2The dryness is 7.6 percent, the strength of the cup body is 3.72N, the compression resistance is 322N, and the cup is soaked in water at the temperature of 60 ℃ for 30min without leakage.
TABLE 1 list of parameters of paper cups for raising seedlings of examples 1-3
The embodiments of the present invention have been described in detail, but the description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention. Any modification, equivalent replacement, and improvement made within the scope of the application of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A process for preparing the degradable paper container used for growing seedlings from the leftover and branch pulp of China fir includes such steps as pulping, concentrating, beating in medium concentration, mixing, concentrating, shaping, baking, hot pressing for fixating shape, and packing, and features that the China fir fibre pulp is used, the pH value is regulated to 6.5-7.5, water is added to regulate concentration to 0.8-1.2%, the concentrated pulp is pumped to shaping machine for wet pressing, and the container is dried by drier and shaped.
2. The method for producing the degradable seedling paper container by using fir leftover and branch pulp as claimed in claim 1, which is characterized by comprising the following steps:
1) pulping: comprises the steps of material selection, crushing, screening, liquid adding, steaming, pulp washing, pulp screening and pulp manufacturing;
2) concentration: concentrating the fir pulp by using a vacuum concentrator;
3) pulping: pulping at medium concentration of 5-6%, wherein the beating degree after pulping is 35-40 DEG SR;
4) size mixing: adding reinforced starch, retention aid, wet strength agent and neutral glue, and adjusting the pH value to 6.5-7.5;
5) concentration adjustment: adding water to adjust the concentration to 0.8-1.2%;
6) molding: pumping the concentrated slurry to a forming machine for wet pressing and forming;
7) and (3) drying: placing the wet-pressed container in a dryer for drying;
8) hot-pressing and shaping: setting a shaping temperature, and sending the dried container into a hot-pressing shaping machine for shaping;
9) and (6) packaging.
3. The method for producing the degradable seedling paper container by using fir leftover and branch pulp as claimed in claim 2, wherein the setting temperature is 200-210 ℃.
4. The method for producing the degradable seedling paper container by using fir leftover and branch pulp as claimed in claim 2, wherein the step 1) comprises the following steps:
A. selecting materials: selecting fir leftover materials and branch materials as raw materials;
B. crushing: crushing the raw materials;
C. screening: selecting fir wood chips with the length of 10-50mm as a raw material for pulping;
D. liquid adding: proportionally mixing the pulp with the washing liquid after washing the pulp, and mixing and stirring the pulp and the fir chips;
E. steaming: gradually adding steam into the digester to a set temperature, keeping the temperature for 60min, and then putting into a spraying pot;
F. washing the pulp: pumping the steamed fir pulp to a pulp washer for vacuum pulp washing;
G. screening pulp: the method comprises the steps of screening pulp for the first time and screening pulp for the second time, screening out slag contained in the fir wood pulp by a slag washing machine for the second time, crushing the slag by a disc mill, and repeatedly carrying out pulp washing and pulp screening;
H. manufacturing paper: and (5) making paper by using the obtained fir wood pulp.
5. The method for producing degradable seedling paper container by using fir leftover and branch pulp as claimed in claim 4, wherein the ratio of the alkali solution to the washing solution to the water in the step of adding liquid is 1:4 by weight, and the water content of the fir chips is 46%.
6. The method for producing a degradable seedling paper container using fir wood leftover and branch pulp as claimed in claim 4, wherein the fibril is maintained during the step 1).
7. The method for producing a degradable seedling paper container by using fir leftover and branch pulp as claimed in claim 4, wherein the steaming process comprises: increasing the temperature from 70 ℃ to 120 ℃ by adding steam for 70 min; raising the temperature from 120 ℃ to 130 ℃ for 35 min; raising the temperature from 130 ℃ to 168 ℃ for 90 min; the holding time is 60 min.
8. The method for producing a degradable seedling paper container by using fir leftover and branch pulp as claimed in claim 4, wherein the raw material in step A comprises bark, leaves and knots of fir.
9. The method for producing a degradable seedling paper container by using fir scraps and branch pulp according to any one of claims 1 to 8, wherein the seedling paper container is a seedling paper support or a seedling paper cup.
10. The method for producing degradable seedling paper container by using fir leftover and branch pulp as claimed in any one of claims 1 to 8, wherein the quantitative material of the obtained seedling paper container is 250-260g/m2The dryness is 7-8 percent, the cup body stiffness is 3.5-3.8N, and the compression resistance is 300-350N; the product is soaked in water at 60 deg.C for 30min without leakage.
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