CN1793490A - Process of preparing mulberry root bark pulp for producing dustless paper - Google Patents
Process of preparing mulberry root bark pulp for producing dustless paper Download PDFInfo
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- CN1793490A CN1793490A CN 200510104677 CN200510104677A CN1793490A CN 1793490 A CN1793490 A CN 1793490A CN 200510104677 CN200510104677 CN 200510104677 CN 200510104677 A CN200510104677 A CN 200510104677A CN 1793490 A CN1793490 A CN 1793490A
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- 235000008708 Morus alba Nutrition 0.000 title claims abstract description 49
- 240000000249 Morus alba Species 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title description 2
- 238000009835 boiling Methods 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 22
- 238000004061 bleaching Methods 0.000 claims abstract description 19
- 239000002994 raw material Substances 0.000 claims abstract description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 27
- 239000002002 slurry Substances 0.000 claims description 23
- 238000010009 beating Methods 0.000 claims description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 9
- 238000005660 chlorination reaction Methods 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 claims description 9
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 7
- 229910052801 chlorine Inorganic materials 0.000 claims description 7
- 239000000460 chlorine Substances 0.000 claims description 7
- 230000014759 maintenance of location Effects 0.000 claims description 6
- 238000010411 cooking Methods 0.000 claims description 3
- 229920002472 Starch Polymers 0.000 claims description 2
- 239000008107 starch Substances 0.000 claims description 2
- 235000019698 starch Nutrition 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 16
- 230000003115 biocidal effect Effects 0.000 abstract description 6
- 238000005406 washing Methods 0.000 abstract description 3
- 239000000428 dust Substances 0.000 abstract 3
- 238000001035 drying Methods 0.000 abstract 1
- 238000004537 pulping Methods 0.000 abstract 1
- 239000000835 fiber Substances 0.000 description 23
- 210000003491 skin Anatomy 0.000 description 17
- 239000000047 product Substances 0.000 description 12
- 229920001131 Pulp (paper) Polymers 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 10
- 239000012535 impurity Substances 0.000 description 4
- 229920000742 Cotton Polymers 0.000 description 3
- 241001343274 Dichrostachys spicata Species 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000002000 scavenging effect Effects 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- JMGZEFIQIZZSBH-UHFFFAOYSA-N Bioquercetin Natural products CC1OC(OCC(O)C2OC(OC3=C(Oc4cc(O)cc(O)c4C3=O)c5ccc(O)c(O)c5)C(O)C2O)C(O)C(O)C1O JMGZEFIQIZZSBH-UHFFFAOYSA-N 0.000 description 1
- 241000255789 Bombyx mori Species 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- 241000201295 Euphrasia Species 0.000 description 1
- 229920002488 Hemicellulose Polymers 0.000 description 1
- 208000001953 Hypotension Diseases 0.000 description 1
- 241000406668 Loxodonta cyclotis Species 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- 208000004880 Polyuria Diseases 0.000 description 1
- 208000035992 Postmortem Changes Diseases 0.000 description 1
- GAMYVSCDDLXAQW-AOIWZFSPSA-N Thermopsosid Natural products O(C)c1c(O)ccc(C=2Oc3c(c(O)cc(O[C@H]4[C@H](O)[C@@H](O)[C@H](O)[C@H](CO)O4)c3)C(=O)C=2)c1 GAMYVSCDDLXAQW-AOIWZFSPSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229960005070 ascorbic acid Drugs 0.000 description 1
- 235000010323 ascorbic acid Nutrition 0.000 description 1
- 239000011668 ascorbic acid Substances 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 201000011510 cancer Diseases 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000035619 diuresis Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 210000002615 epidermis Anatomy 0.000 description 1
- IVTMALDHFAHOGL-UHFFFAOYSA-N eriodictyol 7-O-rutinoside Natural products OC1C(O)C(O)C(C)OC1OCC1C(O)C(O)C(O)C(OC=2C=C3C(C(C(O)=C(O3)C=3C=C(O)C(O)=CC=3)=O)=C(O)C=2)O1 IVTMALDHFAHOGL-UHFFFAOYSA-N 0.000 description 1
- 229940085805 fiberall Drugs 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 229930003944 flavone Natural products 0.000 description 1
- -1 flavone compound Chemical class 0.000 description 1
- 235000011949 flavones Nutrition 0.000 description 1
- 230000002068 genetic effect Effects 0.000 description 1
- 230000008821 health effect Effects 0.000 description 1
- 239000003752 hydrotrope Substances 0.000 description 1
- 208000021822 hypotensive Diseases 0.000 description 1
- 230000001077 hypotensive effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 210000004185 liver Anatomy 0.000 description 1
- 239000001814 pectin Substances 0.000 description 1
- 229920001277 pectin Polymers 0.000 description 1
- 235000010987 pectin Nutrition 0.000 description 1
- 230000000144 pharmacologic effect Effects 0.000 description 1
- FDRQPMVGJOQVTL-UHFFFAOYSA-N quercetin rutinoside Natural products OC1C(O)C(O)C(CO)OC1OCC1C(O)C(O)C(O)C(OC=2C(C3=C(O)C=C(O)C=C3OC=2C=2C=C(O)C(O)=CC=2)=O)O1 FDRQPMVGJOQVTL-UHFFFAOYSA-N 0.000 description 1
- IKGXIBQEEMLURG-BKUODXTLSA-N rutin Chemical compound O[C@H]1[C@H](O)[C@@H](O)[C@H](C)O[C@@H]1OC[C@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](OC=2C(C3=C(O)C=C(O)C=C3OC=2C=2C=C(O)C(O)=CC=2)=O)O1 IKGXIBQEEMLURG-BKUODXTLSA-N 0.000 description 1
- 235000005493 rutin Nutrition 0.000 description 1
- ALABRVAAKCSLSC-UHFFFAOYSA-N rutin Natural products CC1OC(OCC2OC(O)C(O)C(O)C2O)C(O)C(O)C1OC3=C(Oc4cc(O)cc(O)c4C3=O)c5ccc(O)c(O)c5 ALABRVAAKCSLSC-UHFFFAOYSA-N 0.000 description 1
- 229960004555 rutoside Drugs 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- QUCDWLYKDRVKMI-UHFFFAOYSA-M sodium;3,4-dimethylbenzenesulfonate Chemical compound [Na+].CC1=CC=C(S([O-])(=O)=O)C=C1C QUCDWLYKDRVKMI-UHFFFAOYSA-M 0.000 description 1
- 210000004243 sweat Anatomy 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
- VHBFFQKBGNRLFZ-UHFFFAOYSA-N vitamin p Natural products O1C2=CC=CC=C2C(=O)C=C1C1=CC=CC=C1 VHBFFQKBGNRLFZ-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Paper (AREA)
- Sanitary Thin Papers (AREA)
Abstract
The invention relates to a mulberry skin pulp manufacturing method used to produce dust free paper. It adopts mulberry skin as raw material to manufacture dust free paper. It includes the following steps: preparing material; boiling; washing material; pulping; de-sanding; bleaching; washing; manufacturing pulp; drying; and storing. The dust free paper can be used to make hydroscopic property product such as women sanitary towel, baby diaper, and so on. The product is clean, soft, has elasticity, good hydroscopic property, antibiosis and health protection.
Description
Technical field
The present invention relates to pulp technology for making paper, especially relating to a kind of mulberry skin that adopts is the preparation method of mulberry root bark pulp who is used to produce dust-free paper that raw pulp is produced dust-free paper.
Background technology
The raw material that paper pulp adopts of paper grade (stock) is varied in the factory at present, have and adopt herbaceous plant to carry out slurrying, also have and adopt xylophyta to carry out slurrying, and the paper type with respect to different purposes adopts different raw materials to produce different paper pulp, resembles filter paper, toilet paper, printing paper etc.Be used for making the dust-free paper of lives such as sanltary towel, baby diaper and resemble with product, because it directly contacts with the skin of human body, require that product after the processing is pure white, soft, flexible, good hygroscopicity and asepticly human body is damaged preventing, so require high to the dust-free paper that is used to produce this series products.The current raw material that is used to produce dust-free paper is mainly needlebush, cotton linter, chemical modified fiber etc.Use needlebush, cotton linter, though the dust-free paper of raw material production such as chemical modified fiber meets people to sanltary towel, some basic demands of products such as baby diaper, but people are when using these products, because these products directly contact with human body skin, draw people's sweat and urine at these products after, be easy to grow some bacteriums, skin to human body damages, thereby influence the healthy of people, therefore people press for a kind of raw material with antibiotic health care and produce these products, and needlebush, cotton linter, raw materials such as chemical modified fiber all do not have antibiotic health-care function, are used to make sanltary towel by what their were produced, the dust-free paper of products such as baby diaper does not have antibiotic health-care function yet.
Mulberry tree is except that breeding silkworms for picking leaves, the ramulus mori of mulberry leaf and mulberry tree, the dispelling wind and heat from the body of the root bark of white mulberry, feelings liver, make eye bright, sharp joint, diuresis, pharmacologic action such as hypotensive just utilize by China people since ancient times, Shennong's Herbal, " Bencao Tujing ", " property of medicine opinion " etc. are early on the books.The Japanology person finds that the flavone compound that contains in the ramulus mori extract has the effect of resisting genetic cell cancer cellization, and studies show that this compounds has stronger scavenging action, and degree is 5 μ mMl
-1The time, this compounds clearance rate of extracting from ramulus mori, mulberry skin is respectively 83.1%, 56.8%, and its scavenging action is stronger than rutin, ascorbic acid.Therefore, the fiber that the mulberry skin can be used for papermaking has the excellent antibiotic health properties, it can be used for producing the paper pulp of the dust-free paper that is used to make products such as sanltary towel, baby diaper fully, but still is difficult the technology that the mulberry skin is the paper pulp of raw material production dust-free paper in the society at present.
Summary of the invention
The technical problem to be solved in the present invention has provided that a kind of to adopt the mulberry skin be raw pulp is used to produce the preparation method of the mulberry root bark pulp of dust-free paper with production.
For solving the problems of the technologies described above, technical scheme of the present invention is: the preparation method who is used to produce the mulberry root bark pulp of dust-free paper, adopting the mulberry skin is that raw pulp is produced dust-free paper, it mainly comprises gets the raw materials ready, boiling, wash material, making beating, desanding, bleaching, washing, copy steps such as slurry, wherein boiling is to adopt in 10～30% of the relative over dry material of NaOH amount, liquor ratio 1: 3～5,60～120 minutes heating-up times, 130～170 ℃ of boiling maximum temperatures, temperature retention time 180～360 minutes, cooking quality is a permanganate number 3～6, dynamic viscosity 100 ± 10mpa.s, alpha cellulose 〉=90%; Chlorination is adopted in bleaching, in 1～5% of the relative over dry material of effective chlorine dosage amount, starch dense 2～6%, PH9～10,40～60 ℃ of bleaching temperatures, time of chlorinating 40～60 minutes.
As a kind of optimal way, described making beating is 5～10% at slurry concentration, and beating time is under 30～90 minutes, adopts shiny beating, and no little slurry group in the slurry that requires to obtain.
As another kind of optimal way, adopting in the boiling in NaOH is 23～25% with respect to over dry material amount, and liquor ratio is 1: 3～4,60～90 minutes heating-up times, 150～170 ℃ of boiling maximum temperatures, temperature retention time 240～300 minutes.
As another kind of optimal way, effective chlorine dosage is 3～5% with respect to over dry material amount in the employing chlorination bleaching.
In the present invention, the mulberry micromicro is to adopt mechanical mode from acquisitions such as ramulus moris when getting the raw materials ready, and can adopt machineries such as skinning machine that the epidermis of mulberry skin is removed, also can adopt the mode of the biology enzyme that current people generally adopt that it is removed, then the mulberry skin is screened, produce the mulberry skin that needs with the selector symphysis, and cut off, clean, preparation is given in removal of impurities etc., carry out boiling again, after boiling, bleed off raffinate, and the mulberry cladding after the boiling is washed, after meeting production requirement, pull an oar, operations such as desanding, desanding are carried out in desander, and purpose is to remove impurity in the slurry and tiny fiber; And the slurry that obtains washed, be washed to slurry and advance to meet production standard, in pulp machine, slurry is copied slurry afterwards, afterwards, can carry out dried to the slurry that obtains so that store.The equipment that is adopted in whole processing step is current people applied equipment in actual production like an elephant potcher and sand removing machine, the pulp machine etc. in the boiling vessel in the boiling-off, the bleaching, there is no special feature; Each raw material also is that people are used in daily production.
In the present invention, because mulberry fibre is a kind of of bast plant fiber, and the main composition of natural bast plant fiber is a cellulose, wherein also contains part pectin, hemicellulose, lignin, adipocere matter and the hydrotrope, and wherein content of cellulose accounts for about 40～60% of whole mulberry skin.Every physical index of mulberry fibre is as follows:
Average length mm 21.0～31.0
Mean breadth mm 0.01～0.03
Mean aspect ratio 1800～968
Filament tension stress g 20.0
Fracture strength cn/dtex 3.5～5.1
Having adopted better simply production technology among the present invention that the mulberry skin of mulberry fibre with above premium properties is carried out slurrying to it under than the situation of short liquor ratio handles, can make the production that to finish mulberry root bark pulp in the present invention with less supplies consumption, not only technology is simple, be convenient in the production operation of reality, use, and the mulberry fibre function admirable in the mulberry root bark pulp of producing, its every technical indicator can reach: alpha cellulose 〉=92%, paper pulp permanganate number≤3, whiteness 〉=70%, fibre length 〉=20mm, filament tension stress 〉=15g.With the slurry that contains this mulberry fibre is that the dust-free paper of raw material production is made moisture absorption products such as sanltary towel, baby diaper, and product is not only pure white, soft, flexible, good hygroscopicity, aseptic, but also has antibiotic health-care function.
Specific embodiment
Embodiment 1
To put into boiling vessel through the raw material mulberry skin that meets the production needs that preparatory process such as screening, cut-out, cleaning, removal of impurities were handled, employing is 25% in the relative over dry material of NaOH amount, liquor ratio is dosing in 1: 3, be warmed up to 150 ℃ in 60 minutes, and the insulation be 240 minutes, bleed off raffinate after boiling finishes, and the mulberry skin after the boiling washed, making its cooking quality is permanganate number 3～6, dynamic viscosity 100 ± 10mpa.s, alpha cellulose 〉=90%; In beater, the mulberry skin after the boiling is pulled an oar afterwards, adopt shiny beating, and require beating consistency between 5%～10%, pulled an oar 30～90 minutes, in slurry, do not have little slurry group to exist; Again the slurry that obtains is carried out desanding in desander, to remove impurity in the slurry and tiny fiber; Slurry is carried out the chlorination bleaching, adopt the effective chlorine dosage with respect to over dry material amount 5%, slurry concentration can under the condition of 40 ℃ of temperature, pH value 9～10, carry out chlorination 40 minutes about 2～6%; Bleed off raffinate then and it is washed,, just can in pulp machine, copy slurry afterwards and get final product slurry until meeting production standard.
The performance that adopts being used in the mulberry root bark pulp that the foregoing description obtained to produce the mulberry fibre of dust-free paper is: alpha cellulose can reach 95%, paper pulp permanganate number 1.23, whiteness 72%, fibre length 21mm, filament tension stress 16g.
Embodiment 2
The processing step that present embodiment adopted is consistent with embodiment 1, just in technology carry out boiling the time NaOH to count relative over dry material amount be 23%, liquor ratio 1: 3,90 minutes heating-up times, temperature retention time 300 minutes, 170 ℃ of boiling maximum temperatures; When bleaching, then adopt effective chlorine dosage, PH9～10,48 ℃ of bleaching temperatures, time of chlorinating 50 minutes with respect to over dry material amount 3%;
The performance that adopts being used in the mulberry root bark pulp that the foregoing description obtained to produce the mulberry fibre of dust-free paper is: alpha cellulose 96%, paper pulp permanganate number 1.2, whiteness 74%, fibre length 22mm, filament tension stress 17g.
Embodiment 3
The processing step that present embodiment adopted is consistent with embodiment 1, just in technology carry out boiling the time NaOH to count relative over dry material amount be 30%, liquor ratio 1: 5 was warmed up to 170 ℃ of boiling maximum temperatures, temperature retention time 180 minutes in 120 minutes; And when bleaching adopts with respect to over dry material amount 2% effective chlorine dosage, PH9～10,45 ℃ of bleaching temperatures, chlorination 50 minutes.
The performance that adopts being used in the mulberry root bark pulp that the foregoing description obtained to produce the mulberry fibre of dust-free paper is: alpha cellulose 96%, paper pulp permanganate number 1.12, whiteness 76%, fibre length 20mm, filament tension stress 18g.
Embodiment 4
The processing step that present embodiment adopted is consistent with embodiment 1, just in technology carry out boiling the time NaOH to count relative over dry material amount be 15%, liquor ratio 1: 4 was warmed up to 130 ℃ of boiling maximum temperatures, and was incubated 360 minutes in 60 minutes; And when bleaching adopts with respect to over dry material amount 1%, PH9～10,60 ℃ of bleaching temperatures, chlorination 60 minutes.
The performance that adopts being used in the mulberry root bark pulp that the foregoing description obtained to produce the mulberry fibre of dust-free paper is: alpha cellulose 94.8%, paper pulp permanganate number 2.1, whiteness 73%, fibre length 20mm, filament tension stress 17g.
Embodiment 5
The processing step that present embodiment adopted is consistent with embodiment 1, and to count relative over dry material amount be 10% to NaOH when just carrying out boiling in technology, and liquor ratio 1: 3.5 was warmed up to 135 ℃ of boiling maximum temperatures, and was incubated 360 minutes in 120 minutes; And when bleaching adopts with respect to over dry material amount 3.5%, PH9～10,60 ℃ of bleaching temperatures, chlorination 50 minutes.
The performance that adopts being used in the mulberry root bark pulp that the foregoing description obtained to produce the mulberry fibre of dust-free paper is: alpha cellulose 92%, paper pulp permanganate number 27, whiteness 70%, fibre length 20mm, filament tension stress 15g.
Claims (4)
1, is used to produce the preparation method of the mulberry root bark pulp of dust-free paper, adopting the mulberry skin is that raw pulp is produced dust-free paper, it is characterized in that it mainly comprises gets the raw materials ready, boiling, washes material, making beating, desanding, bleaching, washes, copies steps such as slurry, wherein boiling is to adopt in 10～30% of the relative over dry material of NaOH amount, liquor ratio 1: 3～5,60～120 minutes heating-up times, 130～170 ℃ of boiling maximum temperatures, temperature retention time 180～360 minutes, and cooking quality is a permanganate number 3～6, dynamic viscosity 100 ± 10mpa.s, alpha cellulose 〉=90%; Chlorination is adopted in bleaching, in 1～5% of the relative over dry material of effective chlorine dosage amount, starch dense 2～6%, PH9～10,40～60 ℃ of bleaching temperatures, time of chlorinating 40～60 minutes.
2, the preparation method who is used to produce the mulberry root bark pulp of dust-free paper according to claim 1, it is characterized in that: described making beating is 5～10% at slurry concentration, beating time is under 30～90 minutes, adopts shiny beating, and no little slurry group in the slurry that requires to obtain.
3, the preparation method who is used to produce the mulberry root bark pulp of dust-free paper according to claim 1, it is characterized in that: adopting in NaOH in the described boiling is 23～25% with respect to over dry material amount, and liquor ratio is 1: 3～4,60～90 minutes heating-up times, 150～170 ℃ of boiling maximum temperatures, temperature retention time 240～300 minutes.
4, the preparation method who is used to produce the mulberry root bark pulp of dust-free paper according to claim 1 is characterized in that: in the described employing chlorination bleaching effectively chlorine dosage be 3～5% with respect to over dry material amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510104677 CN1793490A (en) | 2005-12-29 | 2005-12-29 | Process of preparing mulberry root bark pulp for producing dustless paper |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510104677 CN1793490A (en) | 2005-12-29 | 2005-12-29 | Process of preparing mulberry root bark pulp for producing dustless paper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1793490A true CN1793490A (en) | 2006-06-28 |
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ID=36805129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510104677 Pending CN1793490A (en) | 2005-12-29 | 2005-12-29 | Process of preparing mulberry root bark pulp for producing dustless paper |
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| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102154887A (en) * | 2011-02-22 | 2011-08-17 | 杨和荣 | Method for producing high-whiteness bleached ramulus mori pulp by caustic soda-anthraquinone continuous stewing technology |
| CN107964822A (en) * | 2017-11-14 | 2018-04-27 | 潍坊友容实业有限公司 | The method of the white willow papermaking of salt-soda soil plant |
| CN112359634A (en) * | 2020-10-26 | 2021-02-12 | 顾理富 | New technology of traditional culture paper |
-
2005
- 2005-12-29 CN CN 200510104677 patent/CN1793490A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102154887A (en) * | 2011-02-22 | 2011-08-17 | 杨和荣 | Method for producing high-whiteness bleached ramulus mori pulp by caustic soda-anthraquinone continuous stewing technology |
| CN107964822A (en) * | 2017-11-14 | 2018-04-27 | 潍坊友容实业有限公司 | The method of the white willow papermaking of salt-soda soil plant |
| CN112359634A (en) * | 2020-10-26 | 2021-02-12 | 顾理富 | New technology of traditional culture paper |
| CN112359634B (en) * | 2020-10-26 | 2022-10-21 | 顾理富 | New technology of traditional culture paper |
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