CN105970738A - Medium-speed qualitative filter paper and preparation method thereof - Google Patents
Medium-speed qualitative filter paper and preparation method thereof Download PDFInfo
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- CN105970738A CN105970738A CN201610518659.5A CN201610518659A CN105970738A CN 105970738 A CN105970738 A CN 105970738A CN 201610518659 A CN201610518659 A CN 201610518659A CN 105970738 A CN105970738 A CN 105970738A
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- filter paper
- slurry
- pulp
- qualitative filter
- surface layer
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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
- D21H27/08—Filter paper
-
- 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
- D21D1/303—Double disc mills
-
- 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
- D21F11/14—Making cellulose wadding, filter or blotting paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
-
- 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
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
- D21H13/12—Organic non-cellulose fibres from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H13/14—Polyalkenes, e.g. polystyrene polyethylene
-
- 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
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
- D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paper (AREA)
Abstract
The invention provides medium-speed qualitative filter paper. The medium-speed qualitative filter paper is of a three-layer structure from an inflow face to an outflow face of the filter paper, wherein a middle layer of the three-layer structure contains the ingredients in parts by weight: 20-40 parts of softwood pulp and 30-80 parts of alkali-treated cotton linter pulp; the inflow face contains the ingredients in parts by weight: 10-30 parts of acetate fibers and 30-60 parts of flax fibers; the outflow face contains the ingredients in parts by weight: 10-30 parts of polypropylene fibers and 40-80 parts of bamboo fibers. The medium-speed qualitative filter paper has the characteristics of good filtering and absorbing performance, long service life, good wet strength and high compressive strength.
Description
Technical field
The present invention relates to filter paper technical field, be specifically related to a kind of middling speed qualitative filter paper and preparation method thereof.
Background technology
Qualitative filter paper, namely qualitative analysis filter paper, its general residual ash is more, is intended for general qualitative analysis and for mistake
Outstanding use in filter precipitation or solution, it is impossible to for quality analysis.But existing qualitative filter paper use single wood pulp as raw material, right
In this Single Fiber material, in order to improve filtering accuracy will reduced bore, thus filtration resistance can be increased, shorten the practical longevity
Life；In order to reduce filtration resistance, increase the service life it is necessary to hole diameter enlargement, but filtering accuracy can be reduced, so being difficult to lead to
Cross the regulation of microscopic void to balance the performance parameter such as filtering accuracy and filtration resistance；The additionally poor water resistance of such qualitative filter paper,
It is run-down that filtration through the short time is just easily caused paper.
Summary of the invention
For the deficiencies in the prior art, the present invention provides a kind of and filters that absorbent properties are good, length in service life, water-tolerant, pressurized
The middling speed qualitative filter paper that intensity is high, present invention also offers the preparation method of this middling speed qualitative filter paper.
For realizing goal of the invention, the technical scheme that the present invention takes is:
Middling speed qualitative filter paper, is three-decker from the face that flows to of filter paper to effluent face, and the intermediate layer of described three-decker is by weight
Number meter, including softwood pulp and the cotton linter pulp processed through alkali of 30-80 part of 20-40 part；Described flows to surface layer by weight
Amount number meter, including acetate fiber and the flax fiber of 30-60 part of 10-30 part, described outflow surface layer is counted by weight,
Polypropylene fiber and the bamboo fibre of 40-80 part including 10-30 part.
As preferably, described flows to also include in surface layer the waterproofing agent of 0.2-2 part, 0.5-2 part wet strength agent.
As preferably, described intermediate layer also includes also including 1-3 part dispersant, 1-2 part wet strength agent.
As preferably, described flows out the waterproofing agent also including 0.2-2 part in surface layer.
As preferably, described dispersant is selected from one or more of carboxymethyl cellulose, sodium pyrophosphate or sodium hexameta phosphate.
As preferably, described wet strength agent is polyamide Hydrin resin.
As preferably, described waterproofing agent is selected from one or more of melmac, water resistant solution or Lauxite.
As preferably, the alpha-cellulose content in described middling speed qualitative filter paper is 95%-98%.
As preferably, the most quantification of 80 ± 4.0g/m2, flow to the quantification of 20 ± 2g/m of surface layer2, intermediate layer is 30 ± 1g/m2, effluent face
Layer is 30 ± 2g/m2。
The invention still further relates to the processing technology of above-mentioned middling speed qualitative filter paper, the technological means taked is:
The preparation method of a kind of middling speed qualitative filter paper, comprises the steps:
1) preparation flows to surface layer, acetate fiber and flax fiber defiberizing machine is discongested by dosage, then through double plate
Fiberizer is polished online and is obtained pulp, then the wet strength agent of formula ratio waterproofing agent and dilute with water is slowly added to pulp
In, obtaining pulping, slurry degree is 14-19 ° of SR, and one layer that is placed in by slurry in many laminar flows oar case is shaped by forming net drainage,
Obtain flowing to surface layer；
2) prepare intermediate layer slurry, discongest by the softwood pulp of dosage and the cotton linter pulp defiberizing machine processed through alkali,
Polish online through double disc refiner again and obtain pulp, then the wet strength agent of formula ratio dispersant and dilute with water is slowly added into
In pulp, obtaining pulping, slurry degree is 14-19 ° of SR；
3) surface layer slurry is flowed out in preparation, discongests by dosage polypropylene fiber and bamboo fibre defiberizing machine, then through double plate
Fiberizer is polished online and is obtained pulp, then the wet strength agent of formula ratio dispersant and dilute with water is slowly added to pulp
In, obtaining pulping, slurry degree is 14-19 ° of SR；
3) by step 2) many laminar flows oar case of being also placed in step 1 of the intermediate layer slurry that obtains, by its slurry slowly be flowed into stream
Entering surface layer and carry out liquid-solid composite, then drainage and formation obtains two-layer composite bed；
4) by step 3) many laminar flows oar case of being also placed in step 1 of the effluent face slurry that obtains, by its slurry slowly be flowed into through
The two-layer composite bed being dried carries out liquid-solid composite, and then drainage and formation obtains three layers of composite bed, is dried.
The layer being obtained fiber filter paper by the method does not has obvious interface, layer to be to be completely wound around interweaving with the fiber of interlayer with interlayer
Together, being even difficult to define the position of each layer, whole fiber filter paper is a structure completed.The intensity of paper by multiple because of
Element determines, most important factor is fibrous binding force, and in fibrous binding force, Hydrogen bonding forces plays very important effect, uses
The filter paper that the method obtains, more likely forms the loose of fiber-water-fiber by even level hydrone with fiber at layer with interlayer
The hydrogen bonded connected, this Hydrogen bonding forces combines with the fiber of interlayer layer with fiber, makes layer and interlayer have intensity,
So that the intensity enhancing of whole fiber filter paper, the beating degree of three layers is all controlled at 14-19 ° of SR, it is ensured that in whole simultaneously
The pore size control of speed qualitative filter paper, at 30～50 microns, meets and often filters 100 milliliters of requirements of not more than 60 seconds.
Detailed description of the invention
The invention is further illustrated by the following examples, but the present invention is not limited solely to following example.
Embodiment 1
A kind of middling speed qualitative filter paper, is three-decker from the face that flows to of filter paper to effluent face, and the intermediate layer of described three-decker is pressed
Parts by weight meter, including 20 parts of softwood pulps, 30 parts of cotton linter pulps processed through alkali, 1 part of dispersant, 1 part of wet strength agent；Institute
The surface layer that flows to stated is counted by weight, including 10 parts of acetate fibers, and 30 parts of flax fibers, the waterproofing agent of 0.2 part, 0.5 part
Wet strength agent；Described outflow surface layer is counted by weight, including the polypropylene fiber of 10 parts, and 30 parts of bamboo fibres, 0.2 part waterproof
Agent；Described dispersant is carboxymethyl cellulose；Described wet strength agent is polyamide Hydrin resin；Described is waterproof
Agent is selected from melmac, and the alpha-cellulose content in described middling speed qualitative filter paper is 95%.
The preparation method of above-mentioned middling speed qualitative filter paper, comprises the steps:
1) preparation flows to surface layer, acetate fiber and flax fiber defiberizing machine is discongested by dosage, then through double plate
Fiberizer is polished online and is obtained pulp, then the wet strength agent of formula ratio waterproofing agent and dilute with water is slowly added to pulp
In, obtaining pulping, slurry degree is 14-19 ° of SR, and one layer that is placed in by slurry in many laminar flows oar case is shaped by forming net drainage,
Obtain flowing to surface layer；
2) prepare intermediate layer slurry, discongest by the softwood pulp of dosage and the cotton linter pulp fluffer processed through alkali, then warp
Cross double disc refiner to polish online and obtain pulp, then the wet strength agent of formula ratio dispersant and dilute with water is slowly added to paper
In slurry slurry, obtaining pulping, slurry degree is 14-19 ° of SR；
3) surface layer slurry is flowed out in preparation, discongests by dosage polypropylene fiber and polyster fibre defiberizing machine, then through double
Mill pulp grinder is polished online and is obtained pulp, then the wet strength agent of formula ratio dispersant and dilute with water is slowly added to paper pulp slurry
In material, obtaining pulping, slurry degree is 14-19 ° of SR；
3) by step 2) many laminar flows oar case of being also placed in step 1 of the intermediate layer slurry that obtains, by its slurry slowly be flowed into stream
Entering surface layer and carry out liquid-solid composite, then drainage and formation obtains two-layer composite bed；
4) by step 3) many laminar flows oar case of being also placed in step 1 of the effluent face slurry that obtains, by its slurry slowly be flowed into through
The two-layer composite bed being dried carries out liquid-solid composite, and then drainage and formation obtains three layers of composite bed, is dried.
The most quantification of 80 ± 4.0g/m2, flow to the quantification of 20 ± 2g/m of surface layer2, intermediate layer is 30 ± 1g/m2, flowing out surface layer is
30±2g/m2。
Embodiment 2
A kind of middling speed qualitative filter paper, is three-decker from the face that flows to of filter paper to effluent face, and the intermediate layer of described three-decker is pressed
Parts by weight meter, including 40 parts of softwood pulps, the cotton linter pulp processed through alkali of 80 parts, 3 parts of dispersants, 2 parts of wet strength agents；
The described surface layer that flows to is counted by weight, including acetate fiber 30 parts, and 60 parts of flax fibers, the waterproofing agent of 2 parts, 2 parts
Wet strength agent；Described outflow surface layer is counted by weight, including the polypropylene fiber of 30 parts, and 80 parts of bamboo fibres, 2 parts waterproof
Agent；Described dispersant is sodium pyrophosphate；Described wet strength agent is polyamide Hydrin resin；Described waterproofing agent is
Water resistant solution, the alpha-cellulose content in described middling speed qualitative filter paper is 98%.
The preparation method of above-mentioned middling speed qualitative filter paper, comprises the steps:
1) preparation flows to surface layer, acetate fiber and flax fiber defiberizing machine is discongested by dosage, then through double plate
Fiberizer is polished online and is obtained pulp, then the wet strength agent of formula ratio waterproofing agent and dilute with water is slowly added to pulp
In, obtaining pulping, slurry degree is 14-19 ° of SR, and one layer that is placed in by slurry in many laminar flows oar case is shaped by forming net drainage,
Obtain flowing to surface layer；
2) prepare intermediate layer slurry, discongest by the softwood pulp of dosage and the cotton linter pulp defiberizing machine processed through alkali,
Polish online through double disc refiner again and obtain pulp, then the wet strength agent of formula ratio dispersant and dilute with water is slowly added into
In pulp, obtaining pulping, slurry degree is 14-19 ° of SR；
3) surface layer slurry is flowed out in preparation, discongests by dosage polypropylene fiber and polyster fibre defiberizing machine, then through double
Mill pulp grinder is polished online and is obtained pulp, then the wet strength agent of formula ratio dispersant and dilute with water is slowly added to paper pulp slurry
In material, obtaining pulping, slurry degree is 14-19 ° of SR；
3) by step 2) many laminar flows oar case of being also placed in step 1 of the intermediate layer slurry that obtains, by its slurry slowly be flowed into stream
Entering surface layer and carry out liquid-solid composite, then drainage and formation obtains two-layer composite bed；
4) by step 3) many laminar flows oar case of being also placed in step 1 of the effluent face slurry that obtains, by its slurry slowly be flowed into through
The two-layer composite bed being dried carries out liquid-solid composite, and then drainage and formation obtains three layers of composite bed, is dried.
The most quantification of 80 ± 4.0g/m2, flow to the quantification of 20 ± 2g/m of surface layer2, intermediate layer is 30 ± 1g/m2, flowing out surface layer is
30±2g/m2。
Embodiment 3
A kind of middling speed qualitative filter paper, is three-decker from the face that flows to of filter paper to effluent face, and the intermediate layer of described three-decker is pressed
Parts by weight meter, including 30 parts of softwood pulps, 60 parts of cotton linter pulps processed through alkali, 2 parts of dispersants, 1 part of wet strength agent；Institute
The surface layer that flows to stated is counted by weight, including 20 parts of acetate fibers, 50 parts of flax fibers, the waterproofing agent of 1 part, 1 part wet by force
Agent；Described outflow surface layer is counted by weight, including the polypropylene fiber of 20 parts, 60 parts of bamboo fibres, the waterproofing agent of 1 part；Institute
The dispersant stated is sodium hexameta phosphate；Described wet strength agent is polyamide Hydrin resin；Described waterproofing agent is urea aldehyde
Resin, the alpha-cellulose content in described middling speed qualitative filter paper is 97%.
The preparation method of above-mentioned middling speed qualitative filter paper, comprises the steps:
1) preparation flows to surface layer, acetate fiber and flax fiber defiberizing machine is discongested by dosage, then through double plate
Fiberizer is polished online and is obtained pulp, then the wet strength agent of formula ratio waterproofing agent and dilute with water is slowly added to pulp
In, obtaining pulping, slurry degree is 14-19 ° of SR, and one layer that is placed in by slurry in many laminar flows oar case is shaped by forming net drainage,
Obtain flowing to surface layer；
2) prepare intermediate layer slurry, discongest by the softwood pulp of dosage and the cotton linter pulp defiberizing machine processed through alkali,
Polish online through double disc refiner again and obtain pulp, then the wet strength agent of formula ratio dispersant and dilute with water is slowly added into
In pulp, obtaining pulping, slurry degree is 14-19 ° of SR；
3) surface layer slurry is flowed out in preparation, discongests by dosage polypropylene fiber and bamboo fibre defiberizing machine, then through double plate
Fiberizer is polished online and is obtained pulp, then the wet strength agent of formula ratio dispersant and dilute with water is slowly added to pulp
In, obtaining pulping, slurry degree is 14-19 ° of SR；
3) by step 2) many laminar flows oar case of being also placed in step 1 of the intermediate layer slurry that obtains, by its slurry slowly be flowed into stream
Entering surface layer and carry out liquid-solid composite, then drainage and formation obtains two-layer composite bed；
4) by step 3) many laminar flows oar case of being also placed in step 1 of the effluent face slurry that obtains, by its slurry slowly be flowed into through
The two-layer composite bed being dried carries out liquid-solid composite, and then drainage and formation obtains three layers of composite bed, is dried；
The most quantification of 80 ± 4.0g/m2, flow to the quantification of 20 ± 2g/m of surface layer2, intermediate layer is 30 ± 1g/m2, flowing out surface layer is
30±2g/m2。
The middling speed qualitative filter paper technical specification that above-described embodiment prepares is as shown in the table:
Claims (10)
1. middling speed qualitative filter paper, it is characterised in that be three-decker from the face that flows to of filter paper to effluent face, the intermediate layer of described three-decker is counted by weight, including softwood pulp and the cotton linter pulp processed through alkali of 30-80 part of 20-40 part；The described surface layer that flows to is counted by weight, and including acetate fiber and the flax fiber of 30-60 part of 10-30 part, described outflow surface layer is counted by weight, including polypropylene fiber and the bamboo fibre of 40-80 part of 10-30 part.
Middling speed qualitative filter paper the most according to claim 1, it is characterised in that described flows to also include in surface layer the waterproofing agent of 0.2-2 part, 0.5-2 part wet strength agent.
Middling speed qualitative filter paper the most according to claim 1, it is characterised in that described intermediate layer also includes also including 1-3 part dispersant, 1-2 part wet strength agent.
Middling speed qualitative filter paper the most according to claim 1, it is characterised in that described flows out the waterproofing agent also including 0.2-2 part in surface layer.
Middling speed qualitative filter paper the most according to claim 1, it is characterised in that described dispersant is selected from one or more of carboxymethyl cellulose, sodium pyrophosphate or sodium hexameta phosphate.
Middling speed qualitative filter paper the most according to claim 1, it is characterised in that described wet strength agent is polyamide Hydrin resin.
Middling speed qualitative filter paper the most according to claim 1, it is characterised in that described waterproofing agent is selected from one or more of melmac, water resistant solution or Lauxite.
Middling speed qualitative filter paper the most according to claim 1, it is characterised in that the most quantification of 80 ± 4.0g/m2, flow into the quantification of 20 ± 2g/m of surface layer2, intermediate layer is 30 ± 1g/m2, outflow surface layer is 30 ± 2g/m2。
Middling speed qualitative filter paper the most according to claim 1, it is characterised in that the alpha-cellulose content in described middling speed qualitative filter paper is 95%-98%.
10. the preparation method of the middling speed qualitative filter paper as described in claim 1 to 9 is arbitrary, it is characterised in that comprise the steps:
1) preparation flows to surface layer, by dosage, acetate fiber and flax fiber defiberizing machine are discongested, polish online through double disc refiner again and obtain pulp, again the wet strength agent of formula ratio waterproofing agent and dilute with water is slowly added in pulp, obtain pulping, slurry degree is 14-19 ° of SR, and one layer that is placed in by slurry in many laminar flows oar case is shaped by forming net drainage, obtains flowing to surface layer；
2) intermediate layer slurry is prepared, discongest by the softwood pulp of dosage and the cotton linter pulp defiberizing machine processed through alkali, polish online through double disc refiner again and obtain pulp, again the wet strength agent of formula ratio dispersant and dilute with water is slowly added in pulp, obtaining pulping, slurry degree is 14-19 ° of SR；
3) surface layer slurry is flowed out in preparation, discongest by dosage polypropylene fiber and bamboo fibre defiberizing machine, polish online through double disc refiner again and obtain pulp, again the wet strength agent of formula ratio dispersant and dilute with water is slowly added in pulp, obtaining pulping, slurry degree is 14-19 ° of SR；
3) by step 2) many laminar flows oar case of being also placed in step 1 of the intermediate layer slurry that obtains, its slurry being flowed into slowly is flow to surface layer and carries out liquid-solid composite, then drainage and formation obtains two-layer composite bed；
4) by step 3) many laminar flows oar case that the effluent face slurry that obtains is also placed in step 1, its slurry two-layer composite bed being flowed into drying slowly is carried out liquid-solid composite, then drainage and formation obtains three layers of composite bed, is dried.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113293648A (en) * | 2020-02-22 | 2021-08-24 | 杭州特种纸业有限公司 | Rapid qualitative filter paper and preparation method thereof |
| CN113293649A (en) * | 2020-02-22 | 2021-08-24 | 杭州特种纸业有限公司 | Slow-speed qualitative filter paper and preparation method thereof |
| CN115748302A (en) * | 2022-12-13 | 2023-03-07 | 杭州特种纸业有限公司 | Medium-speed qualitative filter paper and preparation method thereof |
| CN115928499A (en) * | 2022-11-14 | 2023-04-07 | 杭州特种纸业有限公司 | Breakage-resistant medium-speed qualitative filter paper and preparation method thereof |
| CN116377764A (en) * | 2023-02-13 | 2023-07-04 | 杭州特种纸业有限公司 | Slow quantitative filter paper and preparation method thereof |
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| CN104878642A (en) * | 2015-05-04 | 2015-09-02 | 杭州特种纸业有限公司 | Quantitative filter paper and preparing method and application thereof |
| CN105413486A (en) * | 2015-12-03 | 2016-03-23 | 中国科学院化学研究所 | Cellulose acetate commixed nano-filtration membrane and preparation method thereof |
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| CN2522453Y (en) * | 2001-12-17 | 2002-11-27 | 天津市轻工业造纸技术研究所 | Passenger cabin efficient air-filtering paper |
| CN101367020A (en) * | 2008-09-05 | 2009-02-18 | 华南理工大学 | Double-layer filter material for internal combustion engine |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113293648A (en) * | 2020-02-22 | 2021-08-24 | 杭州特种纸业有限公司 | Rapid qualitative filter paper and preparation method thereof |
| CN113293649A (en) * | 2020-02-22 | 2021-08-24 | 杭州特种纸业有限公司 | Slow-speed qualitative filter paper and preparation method thereof |
| CN113293649B (en) * | 2020-02-22 | 2024-04-12 | 杭州特种纸业有限公司 | Slow qualitative filter paper and preparation method thereof |
| CN115928499A (en) * | 2022-11-14 | 2023-04-07 | 杭州特种纸业有限公司 | Breakage-resistant medium-speed qualitative filter paper and preparation method thereof |
| CN115748302A (en) * | 2022-12-13 | 2023-03-07 | 杭州特种纸业有限公司 | Medium-speed qualitative filter paper and preparation method thereof |
| CN116377764A (en) * | 2023-02-13 | 2023-07-04 | 杭州特种纸业有限公司 | Slow quantitative filter paper and preparation method thereof |
| CN116377764B (en) * | 2023-02-13 | 2024-04-12 | 杭州特种纸业有限公司 | Slow quantitative filter paper and preparation method thereof |
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Application publication date: 20160928 |