CN1580391A - Flyash fiber pulp and papermaking method using same as raw material - Google Patents
Flyash fiber pulp and papermaking method using same as raw material Download PDFInfo
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- CN1580391A CN1580391A CN 200410018433 CN200410018433A CN1580391A CN 1580391 A CN1580391 A CN 1580391A CN 200410018433 CN200410018433 CN 200410018433 CN 200410018433 A CN200410018433 A CN 200410018433A CN 1580391 A CN1580391 A CN 1580391A
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Abstract
This invention discloses fly ash fiber pulp and its use in paper making including the following components and weight percentage: emulsifier 1-10%, dispersant 1-8%, surface modifier 1-10%, powder-coal fiber 20-80%, organic fiber 20-80% and reset for water said pulp is conveyed onto a paper-making machine by conventional method to turn them into paper, which physical performance reaches to the same level as plant fiber paper and water resistance, corrosion prevention and fire prevention are tested better than plant fiber paper by related national standards.
Description
Technical field
The present invention relates to a kind of paper pulp, be specifically related to a kind of fly ash fiber pulp, and be the method for the manufacturing paper material of raw material with the fly ash fiber pulp.
Background technology
Coal ash fiber is to spray silk with ash that produces behind burning coal or the coal dust and slag under high-temperature fusion to make.This inorfil main component is SiO
2, Al
2O
3, contain a spot of Fe
2O
3, CaO, MgO, TiO
2Deng, but the instead of part glass fibre is made various industrial materials.The reasonable utilization of coal ash fiber is the problem that people extremely pay close attention to.
Wherein very significant and utilization high added value is to be applied to the pulp production special paper products.With the coal ash fiber is preparation of raw material paper pulp, can partly replace natural plants paper pulp, and production cost is low, no water source pollutes and environmental pollution, can solve flyash twice laid problem, can lower the waste discharge of natural plants paper-making process again, and save expending of trees resource.
At present, still do not have the bibliographical information that how to adopt coal ash fiber to prepare paper pulp and preparation paper, so this important function for of research exploitation will have crucial meaning.
Summary of the invention
The technical issues that need to address of the present invention are to disclose a kind of fly ash fiber pulp;
Another technical problem that the present invention need solve is that disclosing a kind of is the papermaking process of raw material with the fly ash fiber pulp.
Fly ash fiber pulp of the present invention is in dry pulp, and component and weight percent content comprise in dry pulp:
Coal ash fiber 20～80%
Organic fiber 20～80%
Softening agent 1～10%
Dispersant 1～8%
Surface modifier 1～10%
Wherein: softening agent, dispersant and surface modifier are all in the gross weight of coal ash fiber;
The solid content of fly ash fiber pulp is 65～75%, water 25～35%
When the paper that above-mentioned fly ash fiber pulp is used to prepare was used as various books, newspaper, school paper, the coal ash fiber consumption was 20～40%, organic fiber 60～80%, and most preferably the coal ash fiber consumption is 30%, organic fiber 70%.
Prepared paper is during as boxboard, corrugated paper, industrial filter paper, facing paper and various wrapping paper, and coal ash fiber is 40～60%, organic fiber 40～60%, flyash superfine fibre dry pulp 50% most preferably, organic fiber 50%.
When prepared paper was used as pallet, shuttle ingot, packaging material, the flyash superfine fibre was 60～80%, organic fiber 20～40%, and most preferably coal ash fiber 70%, organic fiber 30%.
Softening agent is selected from a kind of or its mixtures wherein such as hydrochloric acid, sulfuric acid, acetic acid, alkyl acid slaine;
Dispersant be selected from sodium polyphosphate, algae acyl acid sodium, lauryl sodium sulfate, neopelex, oxidic polyethylene or emulsification methyl-silicone oil etc. wherein one or more;
Surface modifier be selected from polyvinyl alcohol water solution, polyacrylamide solution, the modified starch aqueous solution, carboxymethyl cellulose and size emulsion etc. wherein one or more.
Said coal ash fiber is to be the fiber of feedstock production with industrial flyash or coal burning solid residue, said coal ash fiber can adopt applicant's Chinese patent formerly, application number: 200410018352.6 disclosed technology are prepared, and preparation process comprises the steps:
With behind industrial flyash or coal burning solid residue, additive and the water mixing granulation under high-temperature pressurizing heat fused, the melt viscosity of control stabilization, add to depress by the fusion of porous spinnerets and be emitted into silk, spray coolant or surface conditioning agent make ultra-fine inorfil then.
Said additive is an inorganic additive or/and organic additive, and the total amount of inorganic additive and organic additive counts 5～10% with the gross weight of industrial flyash or coal burning solid residue;
Inorganic additive is selected from a kind of or its mixture in lime stone, basalt stone or the white rock etc., and most preferred inorganic additive is a lime stone;
Organic additive is selected from alkyl acid calcium, alkyl acid sodium, alkyl acid zinc, alkyl acid barium, alkyl acid magnesium etc., and most preferred organic additive is an alkyl acid zinc.
Said cooling agent preferred water;
Said surface conditioning agent comprises a kind of in water-soluble polymer weak solution, acidic aqueous solution, ionic surfactant or the silicon-containing surfactant;
Said water-soluble polymer weak solution is selected from polyvinyl alcohol dilute aqueous solution, polyacrylamide dilute aqueous solution, water soluble acrylic acid resinoid weak solution, a kind of in water-soluble cellulose ether or the soluble polyurethane solution etc., and its weight concentration is generally 1～10%;
Said acidic aqueous solution is selected from a kind of in aqueous hydrochloric acid solution, aqueous sulfuric acid, aqueous acetic acid, the dodecyl sulphate aqueous solution or the DBSA aqueous solution etc., and its weight concentration is generally 0.5～5%;
Said ionic surfactant is selected from a kind of in lauryl sodium sulfate, neopelex or the oleoyl amino acid sodium etc.;
Said silicon-containing surfactant is selected from a kind of in alkoxyl polysiloxanes, emulsification methyl-silicone oil, amino-modified silicone oil, carboxy-modified silicone oil, polyether modified silicon oil, the pure modified silicon oil etc.;
Fusion temperature is 1100～1500 ℃;
The pressure of flyash melt-blowing is 0.35～0.65Mpa.
The organic fiber slurry of indication is selected from a kind of or its mixture in xylon slurry, grass fiber slurry, mixed plant fiber pulp and the secondary stock etc., most preferably xylon slurry.
Of the present invention is that the papermaking process of raw material comprises the steps: with the fly ash fiber pulp
Adopting conventional method to be delivered to join on the paper machine above-mentioned fly ash fiber pulp copies paper product, can make paper material;
Wherein: the preparation method of the fly ash fiber pulp of being addressed comprises the steps:
After the coal ash fiber addressed removed the gred, cuts off, discongests through wet method, add softening agent and dispersant or surface modifier, then at 0.2～0.3MPa, temperature is under 80～120 ℃ the condition, stirred 40～80 minutes, and obtained finely dispersed slurries, mix again with the organic fiber slurries, defibrination, dehydration promptly obtain said fly ash fiber pulp.
Said coal ash fiber diameter is 1～10 μ m, and length is 5～50cm.Preferred coal ash fiber diameter is 3～5 μ m, and length is 35～40cm.
Said slagging-off is handled, and is meant that coal ash fiber carries out the wet method slagging-off on the slagging-off machine, removes wherein knot grain or caking, and this machine characteristic is generally 3～5 layers for having multilayer netted filtering device.5 layers of screen pack most preferably.
Said cut-out is meant and uses fibre cutting machine with dead knife and rotor, adopts wet method to shear coal ash fiber is cut to staple fibre below length 3～5mm.Most preferably length is below the 3mm.
Described wet method is meant the coal ash fiber that contains moisture content, and wherein water is 75～85% (weight), and coal ash fiber is 15～25%.Most preferably water is 80%, and coal ash fiber is 20%.
Said discongesting is meant that the coal ash fiber that prescinds discongests on general fluffer, its objective is coal ash fiber is evenly disperseed in water, do not produce gathering.
The slurry that the said coal ash fiber of the present invention is made, slurry yield counts 85%～92% with dry pulp.Under the optimal condition, slurry yield is 90%～92%
According to the purposes difference of target product, can regulate the ratio that the coal ash fiber slurries mix with the organic fiber slurries, to satisfy the requirement of paper different application.
Adopt corresponding national standards that the prepared various paper product of the present invention are detected, physical property reaches the equal performance of string paper, is being better than the string paper aspect resistance to water, the corrosion-resistant and fire line.
Coal ash fiber sheet package material can replace plastic package materials such as polystyrene, polypropylene, polyvinyl chloride.Be easy to after the use reclaim and handle, can go back to nature non-secondary pollution.
The present invention is used for papermaking with the flyash superfine fibre, improves the application added value of flyash, and the paper product of manufacturing can have good application prospects at aspects such as culture and education, industrial production, packaging material.The process of this technology is applicable to industrial-scale production, flyash superfine fibre slurries manufacture process non-pollutant discharge, and reduce the papermaking cost.Method of the present invention is given industrial waste with the functionalization utilization, replaces wood pulp, saves log and expends, and is remarkable to the meaning that protects forest resources.
The specific embodiment
Embodiment 1
With 20 parts of the coal ash fibers (weight) of diameter 3～5 μ m length 15～45cm, 80 parts in water, the back material that is in harmonious proportion enters in the slag remover of 5 layers of net, after slagging-off is filtered, fiber is cut into the short fiber of length 3～5cm with fibre cutting machine.Subsequently, send in the volume fluffer and discongest; Then, add 4 parts of 3% aqueous acetic acids, 1 part of 1% aqueous hydrochloric acid solution, 2 parts of alkyl acid calcium, 2 parts of sodium polyphosphates, 8 parts of 5% polyvinyl alcohol water solutions, 5 parts of the 5% modified starch aqueous solution, mass transport is in pressure vessel, control pressure 0.3MPa in the container, 90～95 ℃ of temperature of control, stirred 60 minutes, make the finely dispersed slurries of coal ash fiber.In dry pulp, yield 90%.In the coal ash fiber slurries, add the xylon for preparing in advance and starch in 20 parts of dry pulps then, defibrination makes it to be uniformly dispersed; Change in the Water Extraction Machinery again and dewater; Resulting using compound pulp is delivered to head tank again, and control discharging flow velocity is transported to papermaking on the paper machine.Prepared paper is suitable for doing boxboard.According to GB GB/T13024-1999 (boxboard) prepared boxboard is measured, its performance indications are between A～B level:
Quantitative 258 g/m
2
Tightness 0.71 g/m
3
Burst index 2.65 kPam
2/ g
(laterally) ring crush index 8.6 Nm/g
(laterally) folding strength 〉=55 times
Water imbibition (just/anti-) 27g/m
2
Delivery moisture 7.5%
Embodiment 2
With 20 parts of the coal ash fibers (weight) of diameter 3～5 μ m length 15～45cm, 80 parts in water, the back material that is in harmonious proportion enters in the slag remover of 5 layers of net, after slagging-off is filtered, fiber is cut into the short fiber of length 3～5cm with fibre cutting machine.Subsequently, send in the volume fluffer and discongest; Then, add 2 parts of 3% aqueous acetic acids, 1 part of 1% aqueous sulfuric acid, 2 parts in alkyl acid magnesium, 2 parts on alkyl acid zinc, 2 parts of 5% polyacrylamide solutions, 2 parts of 10% polyvinyl alcohol water solutions, mass transport is in pressure vessel, control pressure 0.25MPa in the container, 90～95 ℃ of temperature of control, stirred 50 minutes, make the finely dispersed slurries of coal ash fiber.In dry pulp, yield 91%.In the coal ash fiber slurries, add the xylon for preparing in advance and starch in 80 parts of dry pulps then, defibrination makes it to be uniformly dispersed; Change in the Water Extraction Machinery again and dewater; Resulting using compound pulp is delivered to head tank again, and control discharging flow velocity is transported to papermaking on the paper machine.Prepared paper is suitable for doing culture and education paper.According to GB/T18935-2001 (elementary and high school textbook with paper, printing quality standard and the method for inspection) prepared paper is measured, its performance indications are between A～C level:
Quantitative 60g/m
2
Thickness 65 μ m
Whiteness 75%
Opacity 85%
Smoothness (positive and negative is average) 30s
(positive and negative difference) 25%
Tensile strength (average in length and breadth) 28Nm/g
Degree of sizing 0.30mm
Folding strength (laterally) 7 times
Dirt count (0.2mm
2) 90/m
2
Print surface intensity (positive and negative is equal) 1.20m/s
Delivery moisture 4.0%
Embodiment 3
With 18 parts of the coal ash fibers (weight) of diameter 3～5 μ m length 15～45cm, 82 parts in water, the back material that is in harmonious proportion enters in the slag remover of 5 layers of net, after slagging-off is filtered, fiber is cut into the short fiber of length 3～5cm with fibre cutting machine.Subsequently, send in the volume fluffer and discongest; Then, add 3 parts of the 3% sodium polyphosphate aqueous solution, 2 parts of 1% lauryl sodium sulfate, 1 part of alkyl acid barium, 2 parts in algae acyl acid sodium, 1 part of the 8% oxidic polyethylene aqueous solution, 2 parts of 5% emulsification methyl-silicone oils, mass transport is in pressure vessel, control pressure 0.4MPa in the container, 60～65 ℃ of temperature of control, stirred 70 minutes, make the finely dispersed slurries of coal ash fiber.In dry pulp, yield 92%.In the coal ash fiber slurries, add the xylon for preparing in advance and starch in 12 parts of dry pulps then, defibrination makes it to be uniformly dispersed; Change in the Water Extraction Machinery again and dewater; Resulting using compound pulp is delivered to head tank again, and control discharging flow velocity is transported to papermaking on the paper machine.Prepared paper is suitable for doing coated paper envelope paper.According to GB GB/T 7968-1996 (sack kraft paper) prepared paper bag is measured, its performance indications are between excellent～1 grade:
Quantitative 82g/m
2
Tearability 900mN
Air permeability 3.70 μ m/PaS
Water imbibition 11g/m
2
Tensile strength (laterally) 2.6kN/m
Percentage elongation (vertically) 1.8%
Anti-energy absorption (vertically) 63J/m that opens
2
(laterally) 69J/m
2
Moisture 8.1%
Embodiment 4
With 20 parts of the coal ash fibers (weight) of diameter 3～5 μ m length 15～45cm, 80 parts in water, the back material that is in harmonious proportion enters in the slag remover of 5 layers of net, after slagging-off is filtered, fiber is cut into the short fiber of length 3～5cm with fibre cutting machine.Subsequently, send in the volume fluffer and discongest; Then, add 3 parts of 3% aqueous acetic acids, 2 parts in alkyl acid magnesium, 2 parts of sodium polyphosphates, 2 parts of 5% polyacrylamide solutions, 2 parts of 5% carboxymethyl cellulose aqueous solutions, mass transport is in pressure vessel, control pressure 0.20MPa in the container, 80～85 ℃ of temperature of control, stirred 60 minutes, make the finely dispersed slurries of coal ash fiber.In dry pulp, yield 90%.In the coal ash fiber slurries, add the xylon for preparing in advance and starch in 5 parts of dry pulps then, defibrination makes it to be uniformly dispersed; Change in the Water Extraction Machinery again and dewater; Resulting using compound pulp is delivered to head tank again, and control discharging flow velocity is transported to papermaking on the paper machine.Prepared paper is suitable for doing packaging pallet.According to GB/T453-2002 (mensuration of paper and cardboard tensile strength) and GB/T13024-1999 (boxboard) prepared PaperTray is measured, its performance is as follows:
Quantitative 490g/m
2
Tightness 0.78g/m
3
Cross direction tensile strength 16kN/m (thick 1.0mm)
24kN/m (thick 1.5mm)
Water imbibition 3.0g/m
2
Heatproof 600C
Embodiment 5
The preparation of fiber
With 8 parts in flyash 100 parts (weight), lime stone; 2 parts in alkyl acid sodium, 2 parts on alkyl acid zinc, 25 parts of water of blending make powder wetting and caking property arranged; utilize two roll shape comminutors; cause the spherolite of the about 3cm of particle diameter; drop in 1250 ℃ the closed melting furnace, treat complete fusion after, utilize the difference in height of melt liquid level and spinneret to regulate pressure differential; when pressure reaches 0.5MPa, open a sluice gate the spray silk.At spinneret outlet 3cm place, on the filament of ejection, spray emulsification methyl-silicone oil and oleoyl amino acid sodium mixed liquor water smoke equably, make it cooling.Receive silk, obtaining diameter is 1.2～5.5 μ m, and length is the flyash superfine fibre of 30～35cm.
Claims (8)
1. a fly ash fiber pulp is characterized in that, component and weight percent content comprise in dry pulp:
Coal ash fiber 20～80%
Organic fiber 20～80%
Softening agent 1～10%
Dispersant 1～8%
Surface modifier 1～10%
Wherein: softening agent, dispersant and surface modifier are all in the coal ash fiber gross weight;
The solid content of fly ash fiber pulp is 65～75%, water 25～35%;
Softening agent is selected from hydrochloric acid, sulfuric acid, acetic acid, alkyl acid slaine a kind of or its mixture wherein;
Dispersant be selected from sodium polyphosphate, algae acyl acid sodium, lauryl sodium sulfate, neopelex, oxidic polyethylene or emulsification methyl-silicone oil wherein one or more;
Surface modifier be selected from polyvinyl alcohol water solution, polyacrylamide solution, the modified starch aqueous solution, carboxymethyl cellulose and size emulsion wherein one or more;
Said coal ash fiber is to be the fiber of feedstock production with industrial flyash or coal burning solid residue.
2. fly ash fiber pulp according to claim 1 is characterized in that, when the paper that is used to prepare was used as various books, newspaper, school paper, the coal ash fiber consumption was 20～40%, organic fiber 60～80%.
3. fly ash fiber pulp according to claim 1 is characterized in that, prepared paper is during as boxboard, corrugated paper, industrial filter paper, facing paper and various wrapping paper, and coal ash fiber is 40～60%, organic fiber 40～60%.
4. fly ash fiber pulp according to claim 1 is characterized in that, when prepared paper was used as pallet, shuttle ingot, packaging material, coal ash fiber was 60～80%, organic fiber 20～40%.
5. the papermaking process that is raw material with each described fly ash fiber pulp of claim 1～4 comprises the steps:
Adopting conventional method to be delivered to join on the paper machine above-mentioned fly ash fiber pulp copies paper product, can make paper material;
Wherein: the preparation method of the fly ash fiber pulp of being addressed comprises the steps:
After the coal ash fiber addressed removed the gred, cuts off, discongests through wet method, add softening agent and dispersant or surface modifier, then at 0.2～0.3MPa, temperature is under 80～120 ℃ the condition, stirred 40～80 minutes, and obtained finely dispersed slurries, mix with the organic fiber slurries again, defibrination, dehydration promptly obtain said fly ash fiber pulp.
6. method according to claim 5 is characterized in that, said coal ash fiber diameter is 1～10 μ m, and length is 5～50cm.
7. method according to claim 5 is characterized in that, said slagging-off is handled, and is meant that coal ash fiber carries out the wet method slagging-off on the slagging-off machine, and wherein water is 75～85% (weight), and coal ash fiber is 15～25%.
8. method according to claim 5 is characterized in that, said cut-out is meant that adopting wet method to shear is cut to staple fibre below length 3～5mm with coal ash fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410018433 CN1280481C (en) | 2004-05-18 | 2004-05-18 | Flyash fiber pulp and papermaking method using same as raw material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410018433 CN1280481C (en) | 2004-05-18 | 2004-05-18 | Flyash fiber pulp and papermaking method using same as raw material |
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|---|---|
| CN1580391A true CN1580391A (en) | 2005-02-16 |
| CN1280481C CN1280481C (en) | 2006-10-18 |
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|---|---|---|---|
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Cited By (13)
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| CN101870748A (en) * | 2010-06-17 | 2010-10-27 | 华东理工大学 | Preparation and application methods of polyacrylic acid amide modifier for fly ash fiber paper making |
| CN101748650B (en) * | 2009-12-17 | 2011-06-01 | 华东理工大学 | Preparation and application method for fly ash fiber and wood fiber mixed dissolving modifier |
| CN102086610A (en) * | 2010-11-23 | 2011-06-08 | 华东理工大学 | Reinforced modification method for applying fly ash fiber to paper making process |
| CN101538814B (en) * | 2009-04-24 | 2011-08-17 | 厦门市特纤机械设备有限公司 | Solid waste paper pulp and manufacturing method thereof |
| CN101691700B (en) * | 2009-10-15 | 2012-05-23 | 金东纸业（江苏）股份有限公司 | Pulp-grinding method for improving fibre brooming and application thereof in papermaking |
| CN101768885B (en) * | 2010-02-22 | 2013-05-01 | 厦门市特纤机械设备有限公司 | Manufacturing method of inorganic fiber paper pulp |
| CN104213471A (en) * | 2014-09-10 | 2014-12-17 | 济源市金港特纤科技有限公司 | Automotive filtration filter paper made from coal gangue and coal ash inorganic fibers and preparation method of automotive filtration filter paper |
| CN105239450A (en) * | 2015-08-28 | 2016-01-13 | 大连升华粉煤灰制品有限公司 | Fly ash inorganic paper pulp fiber and production method of same |
| CN105239449A (en) * | 2015-08-28 | 2016-01-13 | 大连升华粉煤灰制品有限公司 | Fly ash inorganic fiber paper pulp and production method of same |
| CN105421135A (en) * | 2015-11-30 | 2016-03-23 | 陕西科技大学 | Plant fiber/waste FPR composite material and preparation method thereof |
| CN108824061A (en) * | 2018-08-02 | 2018-11-16 | 枣庄市天龙纸业有限公司 | A method of paper product is produced based on inorganic fiber paper pulp |
| CN110331619A (en) * | 2019-06-18 | 2019-10-15 | 宁波市嘉化新材料科技有限公司 | A kind of coal ash fiber is used to substitute the enhancing modified technique of part waste paper |
| CN114086419A (en) * | 2021-12-01 | 2022-02-25 | 苏明生 | Novel environment-friendly paper shell material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101538814B (en) * | 2009-04-24 | 2011-08-17 | 厦门市特纤机械设备有限公司 | Solid waste paper pulp and manufacturing method thereof |
| CN101691700B (en) * | 2009-10-15 | 2012-05-23 | 金东纸业（江苏）股份有限公司 | Pulp-grinding method for improving fibre brooming and application thereof in papermaking |
| CN101748650B (en) * | 2009-12-17 | 2011-06-01 | 华东理工大学 | Preparation and application method for fly ash fiber and wood fiber mixed dissolving modifier |
| CN101768885B (en) * | 2010-02-22 | 2013-05-01 | 厦门市特纤机械设备有限公司 | Manufacturing method of inorganic fiber paper pulp |
| CN101870748A (en) * | 2010-06-17 | 2010-10-27 | 华东理工大学 | Preparation and application methods of polyacrylic acid amide modifier for fly ash fiber paper making |
| CN102086610A (en) * | 2010-11-23 | 2011-06-08 | 华东理工大学 | Reinforced modification method for applying fly ash fiber to paper making process |
| CN104213471A (en) * | 2014-09-10 | 2014-12-17 | 济源市金港特纤科技有限公司 | Automotive filtration filter paper made from coal gangue and coal ash inorganic fibers and preparation method of automotive filtration filter paper |
| CN105239450A (en) * | 2015-08-28 | 2016-01-13 | 大连升华粉煤灰制品有限公司 | Fly ash inorganic paper pulp fiber and production method of same |
| CN105239449A (en) * | 2015-08-28 | 2016-01-13 | 大连升华粉煤灰制品有限公司 | Fly ash inorganic fiber paper pulp and production method of same |
| CN105239449B (en) * | 2015-08-28 | 2018-07-13 | 大连升华粉煤灰制品有限公司 | A kind of fly ash inorganic fibre pulp and its manufacturing method |
| CN105421135A (en) * | 2015-11-30 | 2016-03-23 | 陕西科技大学 | Plant fiber/waste FPR composite material and preparation method thereof |
| CN105421135B (en) * | 2015-11-30 | 2017-11-28 | 陕西科技大学 | A kind of string/discarded FRP composites and preparation method thereof |
| CN108824061A (en) * | 2018-08-02 | 2018-11-16 | 枣庄市天龙纸业有限公司 | A method of paper product is produced based on inorganic fiber paper pulp |
| CN110331619A (en) * | 2019-06-18 | 2019-10-15 | 宁波市嘉化新材料科技有限公司 | A kind of coal ash fiber is used to substitute the enhancing modified technique of part waste paper |
| CN114086419A (en) * | 2021-12-01 | 2022-02-25 | 苏明生 | Novel environment-friendly paper shell material and preparation method thereof |
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