CN1478953A - Manufacturing method of newsprinting paper - Google Patents
Manufacturing method of newsprinting paper Download PDFInfo
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- CN1478953A CN1478953A CNA031353495A CN03135349A CN1478953A CN 1478953 A CN1478953 A CN 1478953A CN A031353495 A CNA031353495 A CN A031353495A CN 03135349 A CN03135349 A CN 03135349A CN 1478953 A CN1478953 A CN 1478953A
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- newsprint
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Abstract
A technology for making newspaper from hemp through mechanically separating hemp fibres from core, preimmersing the core, continuous steam explosion to obtain pulp, bleaching, adding small quantity of long fibres, and shaping. Its advantages are saving energy, high output rate, and no need of wood.
Description
Technical field
The present invention relates to a kind of preparation method of newsprint, more particularly, the present invention relates to a kind of method that is the feedstock production newsprint with big waste of flax core.
Background technology
Newsprint, the popular name newsprint is mainly used for print newspapers and magazine.Papery is soft, and generally not applying glue has bigger absorbent properties, to guarantee that printing ink is fixed on the trace soon.The paper making raw material of producing newsprint requires to mix the long fiber mechanical pulp of larger proportion.Therefore, the short fibered pulp of non-timber is difficult in the raw materials market of newsprint big conduct.
Hemp is a kind of quality raw materials of papermaking, but described up to now hemp only is meant very long hemp bast fiber.Usually, in the big whole hemp stalk gross mass, hemp bast fiber only accounts for 20%, and hemp stalk core accounts for 80%.Because the hemp stalk core fiber on average has only 0.55 millimeters long, is considered to the low raw material of a class value, never in paper industry, obtain to utilize.Therefore, even if with traditional pulp and paper technology of comparative maturity, the relevant report of hemp stalk core production technology is arranged seldom also.
The pulping and paper-making of relevant so far hemp all usefulness be hemp skin raw material, annual use amount is only about 250,000 tons, remaining hemp stalk core (about 1,400,000 tons) nearly all be act as a fuel burning, low value is handled or discard.The stalk core that if adding is used to weave stays with the processing of hemp skin etc., the discarded amount of global hemp stalk core also is appreciable.In the past, dispersion plantation and the restriction plantation of hemp make the hemp stalk core difficulty what conduct be arranged, and in a way because problems such as burning are also brought the negative effect to ecological environment.
Along with industrial hemp industrial chain development need has pushing open of large-scale planting, the utilization of hemp stalk core is regarded as the matter of utmost importance that will solve.Though steam explosion pulping has many relevant reports, the process of industrialization, particularly the steam explosion pulping production process is rare especially continuously, says nothing of the steam explosion pulping to hemp stalk core.This has become the important topic that people constantly study and explore.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, providing a kind of is the method for feedstock production newsprint with the hemp stalk chip directly.
The invention provides a kind of preparation method of newsprint, this method comprises the step of following order:
Except as otherwise noted, the percentage that is adopted among the present invention is percetage by weight.
(1) gather in the crops air-dry hemp stalk from the field after mechanical peeling machine divides skin, stalk core material sheet is transported to the slurrying yard and is covered storage;
(2) be raw material with stalk core material sheet, enter the feed liquid blender through the tablet storehouse; The water that adds 4～6 times of raw material weights in the feed liquid blender adds alkali and/or the inorganic salts that account for raw material weight 1%～6% simultaneously, sends into pre-steam room after mixing, and steams 2～6 minutes in advance down at 70 ℃～100 ℃;
(3) will state the solidliquid mixture that step obtains and under 175 ℃～220 ℃, carry out continuous steam explosion pulping, reaction time 3～8 minutes, 4～10 seconds blanking times of continuous demolition; Then, adopt multistage extruding washing, advance to starch concentration 12%～20%, pulp concentration 35%～42%, and through screening, gained slurry concentration 〉=2.5%;
The pulping result: yield greater than 75%, become pulp brightness 25%～40%, pulping tensile index 38Nm/g～50N.m/g, tear index 2.5Nm/g～3.2Nm/g, opacity greater than 99%;
(4) will go up stalk core explosion pulp that step obtains through elution, hydrogen peroxide bleaching and washing, defibrination, promptly obtain copying mainly joining of newsprint production slurry kind; Wherein: the 1. elution of stalk core explosion pulp, metal chelating agent consumption 0.5%～1.0%, sodium hydroxide concentration 1%～2%, slurry concentration 4%-6%, 35 ℃～50 ℃ of temperature, 30～60 minutes time; 2. hydrogen peroxide bleaching and washing, hydrogen peroxide consumption 2%～4%, sodium hydroxide concentration 2%～3.5%, magnesium sulfate consumption 0.5%, sodium metasilicate consumption 1%, slurry concentration 10%～20%, 70 ℃～90 ℃ of temperature, 40～60 minutes time; 3. defibrination, disk mill gap 0.05mm～0.2mm, refining concentration 3%～6%, through 3 series connection, 40 ° of SR～45 ° SR of outlet beating degree;
The pulping result: yield of bleached pulp greater than 72%, whiteness 53%～55%, tensile index 42Nm/g～60Nm/g, tear index 2.7mNm
2/ g～3.5mNm
2/ g, opacity are greater than 90%.
(5) copy joining of going up that step obtains slurry and kind carry out paper machine making, promptly obtain required newsprint finished product by the conventional production method of pulp technology for making paper.
Compared with prior art, the invention has the beneficial effects as follows:
(1) is the newsprint that feedstock production goes out to meet national A grade standard with the hemp stalk core first, turns waste into wealth, make staple fibre stalk core explosion pulp produce newsprint and become a reality.In the industrial hemp large-scale development, face thorny stalk core processing and found desirable solution with digestive problems.
(2) pulping physical strength index and chemical pulp are quite and yield is the twice nearly of chemical pulp.Realized that the hemp stalk core explosion pulp by staple fibre is the important breakthrough that main body substitutes wood pulp fiber production newsprint.Utilize the Large-Scale Equipment daily output of continuous steam explosion pulping can reach 250 tons, can drive the fast development of industrial hemp industrial chain.
(3) effectively overcome short fiber material low drawback of physical strength in the high yield cooking process of hemp stalk core, strictness control by pulping process, make the physical strength index of stalk core explosion pulp reach the level of stalk core chemical pulp comprehensively, kept other basic physical features of high yield pulp simultaneously again.Though the restriction of staple fibre improves the tearing strength index of steam blasting slurry and is restricted, join copy≤15% long fiber pulp is enough to satisfy the tearing strength requirement that stalk core explosion pulp is produced national A level newsprint.
(4) preparation method has high yield, low chemicals input (NaOH, Na
2CO
3, NaHSO
3, or Na
2SO
3Deng, total dosage is no more than 6%) characteristics, directly discharging of waste liquid on 3 grades of discharge standard lines of country, only just can reach national 2 grades of discharge standards with biochemical treatment substantially.The waste liquid of steam explosion pulping has the value that reclaims sugar part, has effectively promoted added value of product.Supporting recovery system, when waste liquid sugar part was recycled, waste liquid was realized zero-emission, thereby had accomplished the production that cleans of slurrying.Have good society, environmental protection and economic benefit.
The specific embodiment
By specific embodiment given below, can further be well understood to the present invention.But they are not limitation of the invention.
Embodiment 1
To the hemp stalk core dry dust removal that skin stalk seperator is separated, send into scroll feeder through belt conveyor, be to mix sodium hydroxide concentration 3% at 1: 4 with the aqueous solution of alkali by liquor ratio.Mix tablet and enter pre-steam room, feed steam, temperature is controlled at 90 ℃ of pre-steamings 5 minutes, sends into steam explosion pulping afterwards, and reaction arrived burst-chamber in 6 minutes under 190 ℃ vapor (steam) temperature, finished the slurry of reaction and sent the explosion storehouse to 5 seconds interval.The slurry that explosion is come out is after the extruding washing, and dilute with water by pressurized screen, is sent into reserve pit after the dehydration washing.
The metal chelating agent ethylenediamine tetra-acetic acid of adding 0.5%, 1% NaOH, the control slurry is dense to be 6%, under 40 ℃ of temperature, handled 40 minutes, washing concentrating enters bleaching tower, handles 60 minutes under the condition of 75 ℃ of hydrogen peroxide consumption 3.5%, sodium hydroxide concentration 3%, magnesium sulfate consumption 0.5%, sodium metasilicate consumption 1%, slurry concentration 15%, temperature.After the bleached pulp washing, through three mill series connection making beating, obtaining beating degree is the slurry of 40 ° of SR～43 ° SR.Bleach pulping as the main body slurry with this, be equipped with 10%～15% long fiber wood pulp, basic dressing proportionaling collecting newsprint in addition is met the newsprint of national A grade standard.
Embodiment 2
Repeat embodiment 1, following difference is arranged: the tablet of sending into scroll feeder mixes sodium hydroxide concentration 5% with the aqueous solution of alkali by liquor ratio 1 to 5.5; The vapor (steam) temperature of sending into the steam explosion pulping reactor is implemented explosion then 190 ℃ of reactions 3 minutes; Slurry blasting time is spaced apart 6 seconds; Newsprint joins that to copy long stapled proportioning be 7%～15%, and resulting newsprint satisfies national A grade standard.
Embodiment 3
Repeat embodiment 1, following difference is arranged: the tablet of sending into scroll feeder mixes sodium hydroxide concentration 2%, sodium sulfite consumption 3% with alkali by liquor ratio 1 to 4.5 with the aqueous solution of sodium sulfite; The vapor (steam) temperature of sending into the steam explosion pulping reactor is implemented explosion then 200 ℃ of reactions 4 minutes; Slurry blasting time is spaced apart 6 seconds; Hydrogen peroxide consumption 2.5%, sodium hydroxide concentration 2.5% that hydrogen peroxide bleaching is handled; Newsprint joins that to copy long stapled proportioning be 8%～15%.Resulting newsprint satisfies national A grade standard.
Embodiment 4
Repeat embodiment 1, following difference is arranged: the tablet of sending into scroll feeder and the aqueous solution of alkali and sodium sulfite are to mix sodium hydroxide concentration 1%, sodium sulfite consumption 4%, sodium hydrogensulfite consumption 1% at 1: 4.5 by liquor ratio; The vapor (steam) temperature of sending into the steam explosion pulping reactor is implemented explosion then 200 ℃ of reactions 5 minutes; Slurry blasting time is spaced apart 6 seconds; Hydrogen peroxide consumption 2.0%, sodium hydroxide concentration 2.5% that hydrogen peroxide bleaching is handled; Newsprint joins that to copy long stapled proportioning be 8%～15%.Resulting newsprint satisfies national A grade standard.
Embodiment 5
Repeat embodiment 1, following difference is arranged: the tablet of sending into scroll feeder mixes sodium hydroxide concentration 0.5%, sodium sulfite consumption 3%, sodium hydrogensulfite consumption 2.5% at 1: 5 by liquor ratio with the aqueous solution of alkali and sodium sulfite; The vapor (steam) temperature of sending into the steam explosion pulping reactor is implemented explosion then 205 ℃ of reactions 5 minutes; Slurry blasting time is spaced apart 6 seconds; Hydrogen peroxide consumption 2.0%, sodium hydroxide concentration 2.5% that hydrogen peroxide bleaching is handled.Resulting newsprint satisfies national A grade standard.
Claims (3)
1. the preparation method of a newsprint, this method comprises the step of following order:
(1) gather in the crops air-dry hemp stalk from the field after mechanical peeling machine divides skin, stalk core material sheet is transported to the slurrying yard and is covered storage;
(2) be raw material with stalk core material sheet, enter the feed liquid blender through the tablet storehouse; The water that adds 4～6 times of raw material weights in the feed liquid blender adds alkali and/or the inorganic salts that account for raw material weight 1%～6% simultaneously, sends into pre-steam room after mixing, and steams 2～6 minutes in advance down at 70 ℃～100 ℃;
(3) will go up the solidliquid mixture that step obtains and under 175 ℃～220 ℃, carry out continuous steam explosion pulping, reaction time 3～8 minutes, 4～10 seconds blanking times of continuous demolition; Then, adopt multistage extruding washing, advance to starch the percetage by weight 12%～20% of concentration, the percetage by weight 35%～42% of pulp concentration, and through screening, percetage by weight 〉=2.5% of gained slurry concentration;
(4) will go up stalk core explosion pulp that step obtains through elution, hydrogen peroxide bleaching and washing, defibrination, promptly obtain copying mainly joining of newsprint production slurry kind;
(5) copy joining of going up that step obtains slurry and kind carry out paper machine making, promptly obtain required newsprint finished product by the conventional production method of pulp technology for making paper.
2. the preparation method of newsprint according to claim 1, wherein described alkali of step (2) or inorganic salts are selected from a kind of in NaOH, sodium sulfite or the sodium hydrogensulfite or their mixture.
3. the preparation method of newsprint according to claim 1, the wherein elution of the described stalk core of step (4) explosion pulp, metal chelating agent consumption 0.5%～1.0%, sodium hydroxide concentration 1%～2%, slurry concentration 4%-6%, 35 ℃～50 ℃ of temperature, 30～60 minutes time; Hydrogen peroxide bleaching and washing, hydrogen peroxide consumption 2%～4%, sodium hydroxide concentration 2%～3.5%, magnesium sulfate consumption 0.5%, sodium metasilicate consumption 1%, slurry concentration 10%～20%, 70 ℃～90 ℃ of temperature, 40～60 minutes time; Defibrination, disk mill gap 0.05mm～0.2mm, refining concentration 3%～6%, through 3 series connection, 40 ° of SR～45 ° SR of outlet beating degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03135349 CN1204316C (en) | 2003-07-02 | 2003-07-02 | Manufacturing method of newsprinting paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03135349 CN1204316C (en) | 2003-07-02 | 2003-07-02 | Manufacturing method of newsprinting paper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1478953A true CN1478953A (en) | 2004-03-03 |
| CN1204316C CN1204316C (en) | 2005-06-01 |
Family
ID=34154597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03135349 Expired - Fee Related CN1204316C (en) | 2003-07-02 | 2003-07-02 | Manufacturing method of newsprinting paper |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1204316C (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101525644B (en) * | 2008-03-04 | 2012-01-04 | 中粮集团有限公司 | Method for preparing monosaccharide by using raw material containing cellulose |
| CN101525636B (en) * | 2008-03-04 | 2012-01-04 | 中粮集团有限公司 | Method for preparing ethanol by using raw material containing cellulose |
| CN101525643B (en) * | 2008-03-04 | 2012-01-04 | 中粮集团有限公司 | Method for preparing monosaccharide by using raw material containing cellulose |
| CN101735395B (en) * | 2009-12-24 | 2012-01-25 | 昆明理工大学 | Preparation method of water absorbing material of industrial hemp stalk core cellulose |
| CN101386876B (en) * | 2007-09-10 | 2012-03-21 | 中粮集团有限公司 | Method for preparing monosaccharide by raw materials containing cellulose |
| CN101525635B (en) * | 2008-03-04 | 2012-03-21 | 中粮集团有限公司 | Method for preparing ethanol by using raw material containing cellulose |
| CN101386872B (en) * | 2007-09-10 | 2012-10-03 | 中粮集团有限公司 | Method for preparing ethanol by raw materials containing cellulose |
| CN107237212A (en) * | 2017-06-07 | 2017-10-10 | 常州西夏墅东方工具有限公司 | A kind of filter of automobile engine air paper and preparation method thereof |
-
2003
- 2003-07-02 CN CN 03135349 patent/CN1204316C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101386876B (en) * | 2007-09-10 | 2012-03-21 | 中粮集团有限公司 | Method for preparing monosaccharide by raw materials containing cellulose |
| CN101386872B (en) * | 2007-09-10 | 2012-10-03 | 中粮集团有限公司 | Method for preparing ethanol by raw materials containing cellulose |
| CN101525644B (en) * | 2008-03-04 | 2012-01-04 | 中粮集团有限公司 | Method for preparing monosaccharide by using raw material containing cellulose |
| CN101525636B (en) * | 2008-03-04 | 2012-01-04 | 中粮集团有限公司 | Method for preparing ethanol by using raw material containing cellulose |
| CN101525643B (en) * | 2008-03-04 | 2012-01-04 | 中粮集团有限公司 | Method for preparing monosaccharide by using raw material containing cellulose |
| CN101525635B (en) * | 2008-03-04 | 2012-03-21 | 中粮集团有限公司 | Method for preparing ethanol by using raw material containing cellulose |
| CN101735395B (en) * | 2009-12-24 | 2012-01-25 | 昆明理工大学 | Preparation method of water absorbing material of industrial hemp stalk core cellulose |
| CN107237212A (en) * | 2017-06-07 | 2017-10-10 | 常州西夏墅东方工具有限公司 | A kind of filter of automobile engine air paper and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1204316C (en) | 2005-06-01 |
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