CN107604741B - A method of preparing environmentally friendly brown paper using old newsprint - Google Patents
A method of preparing environmentally friendly brown paper using old newsprint Download PDFInfo
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- CN107604741B CN107604741B CN201710889708.0A CN201710889708A CN107604741B CN 107604741 B CN107604741 B CN 107604741B CN 201710889708 A CN201710889708 A CN 201710889708A CN 107604741 B CN107604741 B CN 107604741B
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- old newsprint
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- useless
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000002002 slurry Substances 0.000 claims abstract description 85
- 239000000123 paper Substances 0.000 claims description 65
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 238000004537 pulping Methods 0.000 claims description 24
- 238000005406 washing Methods 0.000 claims description 17
- 239000002761 deinking Substances 0.000 claims description 16
- 238000012216 screening Methods 0.000 claims description 15
- 239000011268 mixed slurry Substances 0.000 claims description 14
- 238000012545 processing Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 8
- 238000010009 beating Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 239000003153 chemical reaction reagent Substances 0.000 claims description 8
- 239000012141 concentrate Substances 0.000 claims description 8
- 230000003811 curling process Effects 0.000 claims description 8
- 230000018044 dehydration Effects 0.000 claims description 8
- 238000006297 dehydration reaction Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 238000005188 flotation Methods 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 239000004033 plastic Substances 0.000 claims description 8
- 229920003023 plastic Polymers 0.000 claims description 8
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 8
- 238000009955 starching Methods 0.000 claims description 8
- 238000011002 quantification Methods 0.000 claims description 7
- 239000010893 paper waste Substances 0.000 claims description 5
- 239000002655 kraft paper Substances 0.000 claims description 3
- 229920001131 Pulp (paper) Polymers 0.000 claims description 2
- 241000274582 Pycnanthus angolensis Species 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 239000011087 paperboard Substances 0.000 claims description 2
- 240000000491 Corchorus aestuans Species 0.000 claims 1
- 235000011777 Corchorus aestuans Nutrition 0.000 claims 1
- 235000010862 Corchorus capsularis Nutrition 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000002360 preparation method Methods 0.000 abstract description 4
- 235000013305 food Nutrition 0.000 abstract description 2
- 241000411851 herbal medicine Species 0.000 abstract description 2
- 239000012939 laminating adhesive Substances 0.000 abstract description 2
- 238000003475 lamination Methods 0.000 abstract description 2
- 238000004806 packaging method and process Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 description 8
- 238000005360 mashing Methods 0.000 description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 235000008708 Morus alba Nutrition 0.000 description 1
- 240000000249 Morus alba Species 0.000 description 1
- 244000082204 Phyllostachys viridis Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000011122 softwood Substances 0.000 description 1
- 238000009270 solid waste treatment Methods 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 239000005031 sulfite paper Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- 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
- Paper (AREA)
Abstract
It is with U.S. useless No. 13 slurries by the slurry of old newsprint obtained according to 8.5 the invention discloses a kind of method preparing environmentally friendly brown paper using old newsprint：1.5 mass ratio is uniformly mixed, then environmentally friendly brown paper is prepared by paper machine step of manufacturing paper with pulp；The environmentally friendly brown paper that this method is prepared is quantitative in 50~120g/m2；Mainly for the production of Chinese herbal medicine bag, documents pouch, file pouch, envelope, and for producing lamination laminating adhesive make food packaging etc.；This method is to recycle old and useless newspaper, so that the preparation of environmentally friendly brown paper does not need considerable damage plant resources, the influence to environment is preferably minimized, has obvious economic benefit and social benefit.
Description
Technical field
The present invention relates to Pulp and Paper Engineering technical fields, and environmentally friendly ox is prepared using old newsprint more particularly, to a kind of
The method of mulberry paper.
Background technology
Environmentally friendly brown paper (kraftpaper) is tough and tensile water-fast package paper, is usually in yellowish-brown, quantitative 80~
120g/m2.It is that raw material is manufactured paper with pulp through mashing on fourdrinier machine to mostly use kp softwood pulp；Mainly it can be used as water
Mud bag paper, M.G. pure sulphite paper, glue envelope paper dress, bituminized paper, cable protective paper, insulating paper etc..Currently, the manufacture of environmentally friendly brown paper mainly with
Based on Straw Pulp and bamboo and wood slurry, a large amount of felling natural resources are needed, to cause the influence to environment more serious, with people
The continuous enhancing of environmental consciousness reduce the felling of forest log, protect forest resources for environmental protection, the recycling of waste paper
Using having had attracted increasing attention, Solid Waste Treatment load in city, waste paper accounts for about 1/3, and waste paper recycles, not only
Pollution can be reduced, cost can be also reduced.
Invention content
Present invention firstly provides a kind of methods preparing environmentally friendly brown paper using old newsprint, to solve the above technical problems
It is at least one.
A method of environmentally friendly brown paper being prepared using old newsprint, is that the slurry of old newsprint obtained gives up No. 13 with beautiful
Slurry is according to 8.5：1.5 mass ratio is uniformly mixed, then environmentally friendly brown paper is prepared by paper machine step of manufacturing paper with pulp.
In some embodiments, the slurry of old newsprint obtained above and U.S. useless No. 13 slurries are pressed into above-mentioned mass ratio
After mixing, defibrination, beating degree controls between 26~28 ° of SR, and after pigmented tinting, pulp brightness is controlled 22~26%, then
Environmentally friendly brown paper is prepared by paper machine step of manufacturing paper with pulp.
In some embodiments, the preparation method of the slurry of the old newsprint is：(1) deinking is reacted：Old newsprint is put
Enter high density hydraulic pulper, after pulping by slurry concentration control between 4.5%~5.5%, hot water is added, temperature control exists
Between 50~60 DEG C, chemical reagent is added, the dosage of NaOH is 1.4%~1.6%, Na2SiO33%~3.5%, H2O2
0.2%~0.25%；Pulping time is 50min；(2) after the completion of deinking reaction, screening and purified treatment is carried out to slurry, removed
The impurity such as plastics, rope beam, ferrous metal, then flotation and washing exclude ink；The whiteness of such old newsprint slurry is up to 48~
52%, at longitudinal fracture length of paper in 2900~3050m.
Above-mentioned U.S. useless No. 13 slurries of the present invention are by washing, mashing, wash again, screen, are beaten acquisition.
In some embodiments, the preparation method of U.S. useless No. 13 slurries is：By double vermicelli ox-hide corrugated papers
New leftover pieces are washed through high density hydraulic pulper pulping, then through highly concentrated slagging-off slanted screen, and pressurized screen is screened and washed, cylinder machine again
Concentrate slurry.
Here useless No. 13 of U.S. refers to the new leftover pieces of double vermicelli ox-hide corrugated papers：Corrugated paper leftover pieces, liners are fiber crops
Slurry or kraft pulp or imitative boxboard paper pulp are packaged the supply of material, be not allow for insoluble adhesive, deformation roll web, concave or convex
Sandwich layer etc. is mixed into, and sandwich layer or face layer should all be not surface treated, are not allow for sundries and are mixed into, unqualified waste paper total amount must not
More than 2%.
In some embodiments, the step of manufacturing paper with pulp is specially：Mixed slurry is through starching, dehydration, drying, squeezing, pressure
Light and curling process obtain environmentally friendly brown paper.
In some embodiments, the old newsprint and U.S. useless No. 13 sieves that 0.3~0.8mm is crossed before mashing.
The environmentally friendly brown paper being prepared using the above method of the present invention is quantitative in 50~120g/m2；Mainly for the production of
Chinese herbal medicine bag, documents pouch, file pouch, envelope, and make food packaging etc. for producing lamination laminating adhesive；This method is by waste and old report
Paper is recycled, so that the preparation of environmentally friendly brown paper does not need considerable damage plant resources, the influence to environment is dropped
To minimum, there is obvious economic benefit and social benefit.
Specific implementation mode
With reference to embodiment, present invention will be explained in further detail.
Embodiment 1
A method of environmentally friendly brown paper being prepared using old newsprint, is included the following steps：
(1) old newsprint processing prepares the slurry of old newsprint
1, deinking is reacted：Old newsprint is put into high density hydraulic pulper, control slurry concentration 4.5% after pulping~
Between 5.5%, hot water is added, temperature controls between 50~60 DEG C, is added chemical reagent, and the dosage of NaOH is 1.4%~
1.6%, Na2SiO33%~3.5%, H2O20.2%~0.25%；Pulping time is 50min；2, after the completion of deinking reaction,
Screening and purified treatment are carried out to slurry, remove the impurity such as plastics, rope beam, ferrous metal, then flotation and washing exclude ink；Such as
The whiteness of this old newsprint slurry is up to 48%, at longitudinal fracture length of paper in 2900m.
Through screening (cross 0.3~0.8mm sieve), it is beaten slurry up to old newsprint.
(2) processing prepares U.S. useless No. 13 slurries
By the new leftover pieces of double vermicelli ox-hide corrugated papers through high density hydraulic pulper pulping, then wash through highly concentrated slagging-off slanted screen
It washs, pressurized screen screens (cross 0.3~0.8mm sieves) again and washing, and cylinder machine concentrates slurry up to U.S. useless No. 13 slurries.
(3) by the slurry of old newsprint and U.S. useless No. 13 slurries according to 8.5：1.5 mass ratio mixes to obtain mixed slurry.
(4) ensure that the whiteness of mixed slurry is 22%, beating degree is controlled in 26 ° of SR；Through starching, dehydration, drying, squeezing,
Environmental protection brown paper (the environmentally friendly quantification of 50g/m of brown paper is made in press polish and curling process2)。
Embodiment 2
A method of environmentally friendly brown paper being prepared using old newsprint, is included the following steps：
(1) old newsprint processing prepares the slurry of old newsprint
1, deinking is reacted：Old newsprint is put into high density hydraulic pulper, control slurry concentration 4.5% after pulping~
Between 5.5%, hot water is added, temperature controls between 50~60 DEG C, is added chemical reagent, and the dosage of NaOH is 1.4%~
1.6%, Na2SiO33%~3.5%, H2O20.2%~0.25%；Pulping time is 50min；2, after the completion of deinking reaction,
Screening and purified treatment are carried out to slurry, remove the impurity such as plastics, rope beam, ferrous metal, then flotation and washing exclude ink；Such as
The whiteness of this old newsprint slurry is up to 49%, at longitudinal fracture length of paper in 2950m.
Through screening (cross 0.3~0.8mm sieve), it is beaten slurry up to old newsprint.
(2) processing prepares U.S. useless No. 13 slurries
By the new leftover pieces of double vermicelli ox-hide corrugated papers through high density hydraulic pulper pulping, then wash through highly concentrated slagging-off slanted screen
It washs, pressurized screen screens (cross 0.3~0.8mm sieves) again and washing, and cylinder machine concentrates slurry up to U.S. useless No. 13 slurries.
(3) by the slurry of old newsprint and U.S. useless No. 13 slurries according to 8.5：1.5 mass ratio mixes to obtain mixed slurry.
(4) ensure that the whiteness of mixed slurry is 23%, beating degree is controlled in 27 ° of SR；Through starching, dehydration, drying, squeezing,
Environmental protection brown paper (the environmentally friendly quantification of 55g/m of brown paper is made in press polish and curling process2)。
Embodiment 3
A method of environmentally friendly brown paper being prepared using old newsprint, is included the following steps：
(1) old newsprint processing prepares the slurry of old newsprint
1, deinking is reacted：Old newsprint is put into high density hydraulic pulper, control slurry concentration 4.5% after pulping~
Between 5.5%, hot water is added, temperature controls between 50~60 DEG C, is added chemical reagent, and the dosage of NaOH is 1.4%~
1.6%, Na2SiO33%~3.5%, H2O20.2%~0.25%；Pulping time is 50min；2, after the completion of deinking reaction,
Screening and purified treatment are carried out to slurry, remove the impurity such as plastics, rope beam, ferrous metal, then flotation and washing exclude ink；Such as
The whiteness of this old newsprint slurry is up to 50%, at longitudinal fracture length of paper in 3000m.
Through screening (cross 0.3~0.8mm sieve), it is beaten slurry up to old newsprint.
(2) processing prepares U.S. useless No. 13 slurries
By the new leftover pieces of double vermicelli ox-hide corrugated papers through high density hydraulic pulper pulping, then wash through highly concentrated slagging-off slanted screen
It washs, pressurized screen screens (cross 0.3~0.8mm sieves) again and washing, and cylinder machine concentrates slurry up to U.S. useless No. 13 slurries.
(3) by the slurry of old newsprint and U.S. useless No. 13 slurries according to 8.5：1.5 mass ratio mixes to obtain mixed slurry.
(4) ensure that the whiteness of mixed slurry is 25%, beating degree is controlled in 28 ° of SR；Through starching, dehydration, drying, squeezing,
Environmental protection brown paper (the environmentally friendly quantification of 65g/m of brown paper is made in press polish and curling process2)。
Embodiment 4
A method of environmentally friendly brown paper being prepared using old newsprint, is included the following steps：
(1) old newsprint processing prepares the slurry of old newsprint
1, deinking is reacted：Old newsprint is put into high density hydraulic pulper, control slurry concentration 4.5% after pulping~
Between 5.5%, hot water is added, temperature controls between 50~60 DEG C, is added chemical reagent, and the dosage of NaOH is 1.4%~
1.6%, Na2SiO33%~3.5%, H2O20.2%~0.25%；Pulping time is 50min；2, after the completion of deinking reaction,
Screening and purified treatment are carried out to slurry, remove the impurity such as plastics, rope beam, ferrous metal, then flotation and washing exclude ink；Such as
The whiteness of this old newsprint slurry is up to 51%, at longitudinal fracture length of paper in 3050m.
Through screening (cross 0.3~0.8mm sieve), it is beaten slurry up to old newsprint.
(2) processing prepares U.S. useless No. 13 slurries
By the new leftover pieces of double vermicelli ox-hide corrugated papers through high density hydraulic pulper pulping, then wash through highly concentrated slagging-off slanted screen
It washs, pressurized screen screens (cross 0.3~0.8mm sieves) again and washing, and cylinder machine concentrates slurry up to U.S. useless No. 13 slurries.
(3) by the slurry of old newsprint and U.S. useless No. 13 slurries according to 8.5：1.5 mass ratio mixes to obtain mixed slurry.
(4) ensure that the whiteness of mixed slurry is 24%, beating degree is controlled in 27 ° of SR；Through starching, dehydration, drying, squeezing,
Environmental protection brown paper (the environmentally friendly quantification of 75g/m of brown paper is made in press polish and curling process2)。
Embodiment 5
A method of environmentally friendly brown paper being prepared using old newsprint, is included the following steps：
(1) old newsprint processing prepares the slurry of old newsprint
1, deinking is reacted：Old newsprint is put into high density hydraulic pulper, control slurry concentration 4.5% after pulping~
Between 5.5%, hot water is added, temperature controls between 50~60 DEG C, is added chemical reagent, and the dosage of NaOH is 1.4%~
1.6%, Na2SiO33%~3.5%, H2O20.2%~0.25%；Pulping time is 50min；2, after the completion of deinking reaction,
Screening and purified treatment are carried out to slurry, remove the impurity such as plastics, rope beam, ferrous metal, then flotation and washing exclude ink；Such as
The whiteness of this old newsprint slurry is up to 52%, at longitudinal fracture length of paper in 3000m.
Through screening (cross 0.3~0.8mm sieve), it is beaten slurry up to old newsprint.
(2) processing prepares U.S. useless No. 13 slurries
By the new leftover pieces of double vermicelli ox-hide corrugated papers through high density hydraulic pulper pulping, then wash through highly concentrated slagging-off slanted screen
It washs, pressurized screen screens (cross 0.3~0.8mm sieves) again and washing, and cylinder machine concentrates slurry up to U.S. useless No. 13 slurries.
(3) by the slurry of old newsprint and U.S. useless No. 13 slurries according to 8.5：1.5 mass ratio mixes to obtain mixed slurry.
(4) ensure that the whiteness of mixed slurry is 26%, beating degree is controlled in 28 ° of SR；Through starching, dehydration, drying, squeezing,
Environmental protection brown paper (the environmentally friendly quantification of 95g/m of brown paper is made in press polish and curling process2)。
Embodiment 6
A method of environmentally friendly brown paper being prepared using old newsprint, is included the following steps：
(1) old newsprint processing prepares the slurry of old newsprint
1, deinking is reacted：Old newsprint is put into high density hydraulic pulper, control slurry concentration 4.5% after pulping~
Between 5.5%, hot water is added, temperature controls between 50~60 DEG C, is added chemical reagent, and the dosage of NaOH is 1.4%~
1.6%, Na2SiO33%~3.5%, H2O20.2%~0.25%；Pulping time is 50min；2, after the completion of deinking reaction,
Screening and purified treatment are carried out to slurry, remove the impurity such as plastics, rope beam, ferrous metal, then flotation and washing exclude ink；Such as
The whiteness of this old newsprint slurry is up to 52%, at longitudinal fracture length of paper in 3050m.
Through screening (cross 0.3~0.8mm sieve), it is beaten slurry up to old newsprint.
(2) processing prepares U.S. useless No. 13 slurries
By the new leftover pieces of double vermicelli ox-hide corrugated papers through high density hydraulic pulper pulping, then wash through highly concentrated slagging-off slanted screen
It washs, pressurized screen screens (cross 0.3~0.8mm sieves) again and washing, and cylinder machine concentrates slurry up to U.S. useless No. 13 slurries.
(3) by the slurry of old newsprint and U.S. useless No. 13 slurries according to 8.5：1.5 mass ratio mixes to obtain mixed slurry.
(4) ensure that the whiteness of mixed slurry is 26%, beating degree is controlled in 28 ° of SR；Through starching, dehydration, drying, squeezing,
Environmental protection brown paper (the environmentally friendly quantification of 115g/m of brown paper is made in press polish and curling process2)。
Performance characterization is carried out to the environmentally friendly brown paper that above-described embodiment 1 to embodiment 6 is prepared, as a result such as table 1.
Table 1
Above-described is only some embodiments of the present invention.For those of ordinary skill in the art, not
Under the premise of being detached from the invention design, various modifications and improvements can be made, these belong to the protection model of the present invention
It encloses.
Claims (1)
1. a kind of method preparing environmentally friendly brown paper using old newsprint, which is characterized in that steps are as follows：
（1）Old newsprint processing prepares the slurry of old newsprint
1) deinking is reacted：Old newsprint is put into high density hydraulic pulper, controls slurry concentration 4.5%~5.5% after pulping
Between, hot water is added, temperature controls between 50~60 DEG C, and chemical reagent is added, and the dosage of NaOH is 1.4%~1.6%,
Na2SiO33%~3.5%, H2O20.2%~0.25%；Pulping time is 50min；2) after the completion of deinking reaction, slurry is carried out
Screening and purified treatment remove plastics, rope beam, ferrous metal impurity, then flotation and washing exclude ink；Such old newsprint slurry
Whiteness be up to 48 ~ 52%, at longitudinal fracture length of paper in 2900 ~ 3050m,
It crosses 0.3~0.8mm sieves, be beaten the slurry up to old newsprint；
（2）Processing prepares U.S. useless No. 13 slurries
By the new leftover pieces of double vermicelli ox-hide corrugated papers through high density hydraulic pulper pulping, then through the washing of highly concentrated slagging-off slanted screen, pressure
Power sieve crosses 0.3~0.8mm screenings and washing again, and cylinder machine concentrates slurry up to U.S. useless No. 13 slurries；
Wherein, described U.S. useless No. 13 refer to the new leftover pieces of double vermicelli ox-hide corrugated papers, and liners is jute pulp or kraft pulp, or imitative
Boxboard paper pulp, is not allow for insoluble adhesive, deformation roll web, concave or convex sandwich layer be mixed into, sandwich layer or face layer are
Non- surface treated is not allow for sundries and is mixed into, and unqualified waste paper total amount must not exceed 2%；
（3）By the slurry of old newsprint and U.S. useless No. 13 slurries according to 8.5：1.5 mass ratio mixes to obtain mixed slurry, defibrination,
Beating degree control is controlled in 26 ~ 28 ° of SR, pulp brightness 22 ~ 26%；
（4）Through starching, dehydration, drying, squeezing, press polish and curling process, quantification of 50 ~ 120g/ m are made2Environmentally friendly brown paper.
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| CN201710889708.0A CN107604741B (en) | 2017-09-27 | 2017-09-27 | A method of preparing environmentally friendly brown paper using old newsprint |
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| CN109403117B (en) * | 2018-11-07 | 2021-07-27 | 广州市咏润纸业科技有限公司 | Composite kraft paper and preparation method thereof |
| CN113832775B (en) * | 2021-07-23 | 2023-05-02 | 广州造纸股份有限公司 | Environment-friendly orange bubble bag envelope paper and preparation method thereof |
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| KR20090055905A (en) * | 2007-11-29 | 2009-06-03 | 쌍용제지주식회사 | Manufacturing method of regenerated kraft paper by recycling waste paper and regenerated kraft paper manufactured thereby |
| CN101725069B (en) * | 2009-10-31 | 2011-05-11 | 华南理工大学 | Method for improving removal effect of ink in waste paper pulp |
| CN102251429B (en) * | 2011-07-27 | 2013-03-20 | 岳阳林纸股份有限公司 | Colored kraft paper and production method thereof |
| CN104611980A (en) * | 2015-01-28 | 2015-05-13 | 联盛纸业（龙海）有限公司 | Manufacturing method for high strength internal binding force cardboard paper |
| CN105603801A (en) * | 2016-01-14 | 2016-05-25 | 河北昌泰纸业有限公司 | Production process for producing craft paper from old paper stock |
| CN106283796B (en) * | 2016-08-22 | 2017-09-01 | 湖北宝塔沛博循环科技有限公司 | Old newsprint produces the production method of brown paper |
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