CN109098045B - Pulp brightness sample preparation method and preparation device - Google Patents
Pulp brightness sample preparation method and preparation device Download PDFInfo
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- CN109098045B CN109098045B CN201810901776.9A CN201810901776A CN109098045B CN 109098045 B CN109098045 B CN 109098045B CN 201810901776 A CN201810901776 A CN 201810901776A CN 109098045 B CN109098045 B CN 109098045B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 238000005464 sample preparation method Methods 0.000 title abstract description 5
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000000835 fiber Substances 0.000 claims abstract description 12
- 239000004744 fabric Substances 0.000 claims abstract description 10
- 238000000967 suction filtration Methods 0.000 claims abstract description 10
- 238000005303 weighing Methods 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 7
- 238000010790 dilution Methods 0.000 claims abstract description 6
- 239000012895 dilution Substances 0.000 claims abstract description 6
- 239000006185 dispersion Substances 0.000 claims abstract description 5
- 238000005259 measurement Methods 0.000 claims abstract description 5
- 238000007865 diluting Methods 0.000 claims abstract description 3
- 238000002791 soaking Methods 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 13
- 229910001220 stainless steel Inorganic materials 0.000 claims description 12
- 239000010935 stainless steel Substances 0.000 claims description 12
- 230000002745 absorbent Effects 0.000 claims description 9
- 239000002250 absorbent Substances 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 3
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 3
- 244000082204 Phyllostachys viridis Species 0.000 claims description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 3
- 239000011425 bamboo Substances 0.000 claims description 3
- 229920000728 polyester Polymers 0.000 claims description 3
- 239000010902 straw Substances 0.000 claims description 3
- 241000609240 Ambelania acida Species 0.000 claims description 2
- 244000025254 Cannabis sativa Species 0.000 claims description 2
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 claims description 2
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 claims description 2
- 235000014676 Phragmites communis Nutrition 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 239000010905 bagasse Substances 0.000 claims description 2
- 235000009120 camo Nutrition 0.000 claims description 2
- 235000005607 chanvre indien Nutrition 0.000 claims description 2
- 239000012634 fragment Substances 0.000 claims description 2
- 239000011487 hemp Substances 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 6
- 241000218657 Picea Species 0.000 description 5
- 244000166124 Eucalyptus globulus Species 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 238000007655 standard test method Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J5/00—Manufacture of hollow articles by transferring sheets, produced from fibres suspensions or papier-mâché by suction on wire-net moulds, to couch-moulds
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Paper (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention belongs to the papermaking technology, and particularly relates to a pulp brightness sample preparation method and device for pulp brightness detection. The preparation method comprises the following operation steps: (1) soaking pulp in water to defiberize, and completely separating fibers; 2) Dilution: diluting the dissociated pulp to 1.95g/L-2.05g/L; (3) weighing: stirring paper pulp to ensure uniform dispersion of fibers, and weighing the required pulp amount of the sample; 4) And (3) suction filtration: a Buchner funnel suction filtration system is adopted, a layer of plastic net is filled in the Buchner funnel, a layer of southern cloth is filled on the plastic net, a vacuum pump is started, weighed paper pulp is poured into the funnel, and water is sucked and filtered; (5) press drying: dehydrating the sample; (6) drying: drying the water to 5% -15% at room temperature; (7) flattening; flattening the sample; (8) measurement: the sample after the filter paper was removed was used directly for measuring brightness. The invention has the advantages of convenient operation, high sample preparation quality, less equipment investment and low cost.
Description
Technical Field
The invention belongs to the papermaking technology, and particularly relates to a pulp brightness sample preparation method and device for pulp brightness detection.
Background
The brightness of paper and pulp is expressed by the diffuse reflectance (%) of the paper and pulp to blue light of dominant wavelength 457nm under simulated D65 light source, diffuse/perpendicular illumination observation conditions. The brightness value of paper pulp influences the selection of various wood pulp, bamboo pulp and straw pulp fiber raw materials by paper making enterprises, and the brightness is also an important detection item of commercial paper pulp.
Commercial paper pulp is divided into a pulp board and a pulp block, the brightness of a sampled sample cannot be directly measured, and the sample needs to be prepared into a sample with a flat surface to accurately measure the brightness value. The traditional preparation method of the brightness sample comprises a hopper method and a sheet former method, and the main defects are as follows: the former used in the sheet former method is relatively costly; the pressurizing equipment used in the two preparation methods requires additional investment and addition; the pH value is regulated by acid and alkali in the pretreatment of paper pulp, and the method is complicated; in the funnel method, as only one layer of southern cloth is filled in the Buchner funnel, partial dehydration is easy to be uneven during tabletting, water flow is large at the holes of the Buchner funnel, water flow is small at the positions without holes, and tiny fibers and other tiny components are extremely easy to gather at the holes of the funnel, so that small bulges are formed, the brightness of the bulges is obviously low, and the testing accuracy is poor.
Disclosure of Invention
The invention aims to solve the technical problem of providing the preparation method and the preparation device for the pulp brightness sample, which are convenient to operate, high in sample preparation quality, low in equipment investment, low in cost and suitable for detection in a general production process.
The operation steps of the pulp brightness sample preparation method of the invention are as follows:
(1) Pretreatment of paper pulp: tearing the pulp board or pulp block and pulp sheet into fragments, soaking in water, and then defibering by using a standard defibering device to completely separate fibers;
(2) Dilution: diluting the dissociated paper pulp to 1.95g/L-2.05g/L, and measuring the accurate concentration of the pulp;
(3) Weighing: stirring paper pulp to ensure uniform dispersion of fibers, and weighing the required pulp amount of the sample;
(4) And (3) suction filtration: a layer of plastic net is filled in the Buchner funnel, and then a layer of southern blight cloth is filled on the plastic net, so that the Bai Juanbu and the plastic net are kept flat; starting a vacuum pump, pouring the weighed paper pulp into a funnel, sucking and filtering water until the mirror surface disappears, and closing the vacuum pump;
(5) Pressing to dry: the funnel is inverted to remove a paper pulp sample, the paper pulp sample is caught by a piece of filter paper, the piece of filter paper is covered on the other side of the sample, the water absorbing paper is respectively covered on the filter paper on the front side and the back side, and then the stainless steel press roller is used for rolling the stacked sample back and forth to dehydrate the sample;
(6) And (3) drying: after the water absorption paper on the two sides is removed, the sample and the filter paper are hung in clean dust-free airflow together, and the moisture is dried to 5% -15% at room temperature;
(7) Flattening; rolling the sample protected by the filter paper back and forth by using a stainless steel press roll to level the sample;
(8) Measurement: the sample after the filter paper was removed was used directly for measuring brightness.
Preferably, the pulp comprises one or more combinations of wood pulp, bamboo pulp, straw pulp, bagasse pulp, reed pulp, and surface hemp long fiber pulp cut to an appropriate degree.
Preferably, the plastic mesh number is 60-80 mesh.
Preferably, the plastic mesh is a polyester mesh.
Preferably, the absorbent paper has a basis weight of 200gsm or more.
The pulp brightness sample preparation device comprises a suction filter bottle inserted with a Buchner funnel, wherein the outer wall of the neck of the Buchner funnel is in sealing connection with the upper opening of the suction filter bottle, a suction opening is arranged on the side wall of the upper part of the suction filter bottle, the suction opening is connected with a closed wide-mouth bottle inlet through a pipeline, and the outlet of the wide-mouth bottle is connected with a vacuum pump; the filter plate of the Buchner funnel is covered with a layer of plastic net, and the plastic net is covered with a layer of southern blight cloth.
The plastic net is a 60-80 mesh polyester net.
A liquid discharge pipe is arranged at one side of the bottom of the suction filter bottle, and a liquid discharge valve is arranged on the liquid discharge pipe.
The method adopts the Buchner funnel suction filtration system with improved structure and the simple pressurizing device, thereby reducing the equipment investment; a layer of plastic net is padded under the southern blight on the filter plate of the Buchner funnel, so that the dehydration is more uniform during suction filtration, the problems that the single-padded bolting is easy to wrinkle, the partial dehydration is uneven, and the surface of a sample is easy to generate protrusions are solved, and the brightness two-sided difference of the prepared sample is smaller; in addition, the acid-base adjusting step is omitted by increasing the dilution degree of the paper pulp, so that the preparation of the paper pulp brightness sample is more convenient, the operation is easy, the tabletting quality is higher, and the method is suitable for detection in the general production process.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The invention will be described in further detail with reference to specific embodiments, but the practical use of the invention is not limited to the embodiments.
Example 1: preparation of eucalyptus chemical pulp board pulp brightness sample:
the instruments used include standard fluffers, buchner funnels, bai Juanbu, 80 mesh plastic nets, qualitative filter papers, stainless steel press rolls and absorbent papers. Wherein the inner diameter of the Buchner funnel is 70mm and is connected with a vacuum pump; bai Juanbu, plastic net diameter 68mm; absorbent paper, basis weight 220gsm; the roll width of the stainless steel press roll is 200mm, and the mass is 10kg.
As shown in fig. 1, the outer wall of the neck of the buchner funnel 1 is in sealing connection with the upper opening of a suction bottle 2, a suction opening 3 is arranged on the side wall of the upper part of the suction bottle, the suction opening is connected with the inlet of a wide-mouth bottle 4 through a pipeline, and the outlet of the wide-mouth bottle is connected with a vacuum pump 5; the filter plate 11 of the buchner funnel is covered with a layer of plastic net 12, and the plastic net is covered with a layer of southern blight cloth 13. A liquid discharge pipe 6 is arranged at one side of the bottom of the suction filter bottle, and a liquid discharge valve 7 is arranged on the liquid discharge pipe.
The preparation operation steps of the pulp brightness sample are as follows:
(1) Pretreatment of paper pulp: the eucalyptus chemical pulp sheet is torn into pieces of about 20mm to 30mm, and the pulp amount is 10g. The crushed pulp pieces are soaked in water for 30min and then are fluffed by using a standard fluffer, the fluffing volume is 2000mL, and the fluffing revolution is 40000 revolutions.
(2) Dilution: the dissociated pulp was diluted with water to 1.95g/L to 2.05g/L, and the slurry concentration was found to be 2.01g/L.
(3) Weighing: the pulp was stirred to ensure uniform dispersion of the fibers and the corresponding slurry was weighed to produce a 160gsm sample of 305mL.
(4) And (3) suction filtration: a layer of plastic net is filled in the Buchner funnel, and then a layer of southern blight cloth is filled on the plastic net, so that the Bai Juanbu and plastic net are kept flat. And (3) starting a vacuum pump, pouring the weighed paper pulp into a funnel, sucking and filtering water until the mirror surface disappears, and closing the vacuum pump.
(5) Pressing to dry: the funnel is inversely moved out of the paper pulp sample, the paper pulp sample is received by a piece of filter paper, the white silk cloth and the plastic net are removed and put back into the Buchner funnel, then the other side of the sample is covered with a piece of filter paper, the front and back sides of the sample are respectively covered with 5 pieces of absorbent paper, and the stacked sample is repeatedly rolled for 5 times by a stainless steel press roller without other pressure.
(6) And (3) drying: after removing the absorbent paper on both sides, the sample and filter paper were suspended together in a clean and dust-free air stream, and dried and dehydrated at room temperature for 16 hours, with a moisture content of 10.7% measured for the sample.
(7) Flattening; the sample protected by the filter paper was rolled back and forth 3 times with a stainless steel press roll without additional pressure.
(8) Measurement: the brightness of the eucalyptus chemical pulp board was 87.8% as measured by the paper brightness standard test method for the sample after the filter paper was removed, and 87.6% as measured by the paper brightness standard test method for the sample compared with the eucalyptus chemical pulp board prepared by the funnel method in GB 8940.2.
Example 2: preparation of pulp brightness test sample of spruce thermomechanical pulp block:
the instruments used were standard fluffer, buchner funnel, bai Juanbu, 60 mesh plastic mesh, qualitative filter paper, stainless steel press roll. Wherein the inner diameter of the Buchner funnel is 70mm and is connected with a vacuum pump; bai Juanbu, plastic net diameter 68mm; absorbent paper, basis weight 200gsm; the roll width of the stainless steel press roll is 200mm, and the mass is 10kg. The structure of the suction filtration system is the same as that of the embodiment.
The preparation operation steps of the pulp brightness sample are as follows:
(1) Pretreatment of paper pulp: the spruce thermomechanical pulp block was shredded into pieces of about 15mm-25mm with a pulp volume of 12g. The crushed pulp pieces are soaked in water for 30min and then are fluffed by using a standard fluffer, wherein the fluffing volume is 2700mL, and the fluffing speed is 20000 revolutions.
(2) Dilution: the dissociated pulp was diluted with water to 1.95g/L to 2.05g/L, and the slurry concentration was found to be 1.95g/L.
(3) Weighing: the pulp was stirred to ensure uniform dispersion of the fibers and the corresponding slurry was weighed to give a 160gsm sample of 315mL.
(4) And (3) suction filtration: a layer of plastic net is filled in the Buchner funnel, and then a layer of southern blight cloth is filled on the plastic net, so that the Bai Juanbu and plastic net are kept flat. And (3) starting a vacuum pump, pouring the weighed paper pulp into a funnel, sucking and filtering water until the mirror surface disappears, and closing the vacuum pump.
(5) Pressing to dry: the funnel is inversely moved out of the paper pulp sample, the paper pulp sample is received by a piece of filter paper, the white silk cloth and the plastic net are removed and put back into the Buchner funnel, then the other side of the sample is covered with a piece of filter paper, the front and back sides of the sample are respectively covered with 6 pieces of absorbent paper, and the stacked sample is repeatedly rolled for 5 times by a stainless steel press roller without other pressure.
(6) And (3) drying: after removing the absorbent paper on both sides, the sample and filter paper were suspended together in a clean and dust-free air stream, and dried and dehydrated at room temperature for 16 hours, and the moisture of the sample was measured to be 9.7%.
(7) Flattening; the sample protected by the filter paper was rolled back and forth 3 times with a stainless steel press roll without additional pressure.
(8) Measurement: the brightness of the spruce thermomechanical pulp block is 73.2% by using a paper brightness standard detection method of the sample after the filter paper is removed; the brightness of the spruce thermomechanical pulp block was measured to be 73.4% using the paper brightness standard test method against the pulp brightness samples of the spruce thermomechanical pulp block prepared using the funnel method in GB 8940.2.
Claims (5)
1. The preparation method of the pulp brightness sample is characterized by comprising the following operation steps of:
1) Pretreatment of paper pulp: tearing the pulp board or pulp block and pulp sheet into fragments, soaking in water, and then defibering by using a standard defibering device to completely separate fibers;
2) Dilution: diluting the dissociated paper pulp to 1.95g/L-2.05g/L, and measuring the accurate concentration of the pulp;
3) Weighing: stirring paper pulp to ensure uniform dispersion of fibers, and weighing the required pulp amount of the sample;
4) And (3) suction filtration: a Buchner funnel suction filtration system is adopted, a layer of plastic net is filled in the Buchner funnel, and then a layer of southern cloth is filled in the plastic net, so that Bai Juanbu and the plastic net are kept flat; starting a vacuum pump, pouring the weighed paper pulp into a funnel, sucking and filtering water until the mirror surface disappears, and closing the vacuum pump;
5) Pressing to dry: the funnel is inverted to remove a paper pulp sample, the paper pulp sample is caught by a piece of filter paper, the piece of filter paper is covered on the other side of the sample, the water absorbing paper is respectively covered on the filter paper on the front side and the back side, and then the stainless steel press roller is used for rolling the stacked sample back and forth to dehydrate the sample;
6) And (3) drying: after the water absorption paper on the two sides is removed, the sample and the filter paper are hung in clean dust-free airflow together, and the moisture is dried to 5% -15% at room temperature;
7) Flattening; rolling the sample protected by the filter paper back and forth by using a stainless steel press roll to level the sample;
8) Measurement: the sample after the filter paper was removed was used directly for measuring brightness.
2. The method for preparing a pulp brightness sample according to claim 1, characterized in that: the pulp comprises one or more of wood pulp, bamboo pulp, straw pulp, bagasse pulp, reed pulp and surface hemp long fiber pulp cut to a proper degree.
3. The method for preparing a pulp brightness sample according to claim 1, characterized in that: the mesh number of the plastic is 60-80 mesh.
4. The method for preparing a pulp brightness sample according to claim 1, characterized in that: the plastic net is a polyester net.
5. The method for preparing a pulp brightness sample according to claim 1, characterized in that: the absorbent paper has a basis weight of 200gsm or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810901776.9A CN109098045B (en) | 2018-08-09 | 2018-08-09 | Pulp brightness sample preparation method and preparation device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810901776.9A CN109098045B (en) | 2018-08-09 | 2018-08-09 | Pulp brightness sample preparation method and preparation device |
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| Publication Number | Publication Date |
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| CN109098045A CN109098045A (en) | 2018-12-28 |
| CN109098045B true CN109098045B (en) | 2024-01-26 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104553104A (en) * | 2014-12-24 | 2015-04-29 | 中国建筑材料科学研究总院 | Flexible heat insulation material and preparation method thereof |
| CN105044282A (en) * | 2015-07-02 | 2015-11-11 | 广西蓝星大华化工有限责任公司 | Device and method for detecting hydrolysis degree in early stage of titanium white-titanium black liquor acid hydrolysis process |
| CN105951492A (en) * | 2016-05-17 | 2016-09-21 | 中国科学院青岛生物能源与过程研究所 | Method for making non-heat-sealing type natural-color tea filter paper with pure wood pulp |
| CN208899249U (en) * | 2018-08-09 | 2019-05-24 | 镇江大东纸业有限公司 | Brightness of pulp sample preparation device |
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- 2018-08-09 CN CN201810901776.9A patent/CN109098045B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104553104A (en) * | 2014-12-24 | 2015-04-29 | 中国建筑材料科学研究总院 | Flexible heat insulation material and preparation method thereof |
| CN105044282A (en) * | 2015-07-02 | 2015-11-11 | 广西蓝星大华化工有限责任公司 | Device and method for detecting hydrolysis degree in early stage of titanium white-titanium black liquor acid hydrolysis process |
| CN105951492A (en) * | 2016-05-17 | 2016-09-21 | 中国科学院青岛生物能源与过程研究所 | Method for making non-heat-sealing type natural-color tea filter paper with pure wood pulp |
| CN208899249U (en) * | 2018-08-09 | 2019-05-24 | 镇江大东纸业有限公司 | Brightness of pulp sample preparation device |
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