CN1201046C - Middle-or low-pressure exposion method for making pulp with broad-leaf wood - Google Patents
Middle-or low-pressure exposion method for making pulp with broad-leaf wood Download PDFInfo
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- CN1201046C CN1201046C CN 02115318 CN02115318A CN1201046C CN 1201046 C CN1201046 C CN 1201046C CN 02115318 CN02115318 CN 02115318 CN 02115318 A CN02115318 A CN 02115318A CN 1201046 C CN1201046 C CN 1201046C
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Abstract
The present invention relates to a broadleaf pulp manufacture method by a middle pressure and low pressure explosion method. The present invention has the steps of raw material preprocessing (medicine with the dosage (the dosage of the medicine is corresponding to the bone dry weight of broadleaf raw materials) of 1 to 6% of alkali, 1 to 16% of sodium-sulfur compound and 0 to 1% of auxiliary agents is added in the broadleaf raw materials and are stirred for 0 to 24 hours under room temperature to 90 DEG C), high temperature and high pressure processing (the preprocessed materials are put in an explosion can to be processed for 3 to 15 minutes under the temperature of 140 to 220 DEG C and the pressure of 0.8mpa to 2.28mpa) and ejection (the raw materials are instantly blasted and ejected to a reception container). Broadleaf blasting paper pulp of the present invention has the advantages of high maintenance intensity, high yield, low energy consumption, high whiteness, good bleaching performance and high toughness. The broadleaf blasting pulp can be used for manufacturing medium high paper.
Description
Technical field
The present invention relates to the pulping technique of field of papermaking, in more detail leaf wood mesolow Demolition Pulping method.
Background technology
Because greening and wood raw material scarcity, China has planted a large amount of Eucalyptus, the living leaf wood of poplar constant speed respectively in the south and the north.Along with development of the West Regions, will plant the living leaf wood of more speed in the west area.These timber are mainly used in the processing glued board at present, and its leftover pieces are basically as fuel.Glued board to the demand of timber also much smaller than the speed of growth of fast growing wood.Although so China's timber resources is generally speaking deficient, a large amount of fast growing woods is suddenly waited to develop.
The leaf wood Demolition Pulping was once becoming the research focus in China, and had proposed various blasting technologies.High pressure blasting procedure for example, because it is improper that process conditions such as burst pressure, preliminary treatment dosage, temperature are grasped, the explosion pulp color and luster of developing is darker, and bleachability is poor, paper fragility is big, so the explosion pulp of producing can only be used to produce building slab, fiberboard or very low-grade paper at present.
Summary of the invention
The object of the present invention is to provide a kind of leaf wood mesolow Demolition Pulping method, make leaf wood explosion paper pulp keep intensity height, yield height, advantage of low energy consumption, and have the whiteness height, bleachability is good, the advantage of good toughness makes the leaf wood explosion pulp can be used to make medium-to-high grade paper.
The living leaf wood density of speed of China's a large amount of cultivations at present is low, and hardness is big, and the molecular weight of cellulose, hemicellulose is less, is subject to destruction in pulping process, causes paper strength to descend, and fragility increases.If preliminary treatment and blasting condition are too violent, in pulping process, generate a large amount of coloring matters, cause whiteness sharply to descend, bleachability descends.
The present invention is especially at the living leaf wood raw material of speed, make the combination that is optimized of pretreating process and blasting condition, the destruction of cellulose and hemicellulose is reduced greatly in blasting process, the reaction that lignin generates coloring matter significantly reduces, thereby make explosion pulp yield height, intensity is good, the whiteness height, bleachability is good, and paper toughness is good.
Leaf wood mesolow Demolition Pulping method of the present invention comprises the steps:
---pretreatment of raw material: the medicine (drug dosage is that relative raw material oven dry weight calculates) that in the leaf wood raw material, adds following consumption:
Alkali 1-6%
Sodium-sulphur compound 1-16%
Auxiliary agent 0-1%
Under normal temperature to 90 ℃ temperature, stirred 0-24 hour;
---mesolow is handled: pretreated material is packed in the cavity charge containers, handled 3-15 minute under 140-220 ℃, 0.8mpa-2.28mpa pressure;
---spurt: raw material moment explosion is spurted to receiving vessel.
Described alkali refers to wherein one or more mixtures of NaOH, sodium carbonate, lime.
Described sodium-sulphur compound refers to wherein one or more mixtures of sodium thiosulfate, dithionate, polysulfide, sodium sulfite, vulcanized sodium.
Described auxiliary agent refers to surface reactive material one or more mixtures wherein of high temperature resistant, the anti-highly basic of nonionic or anionic.
Preferred version of the present invention is as follows:
---pretreatment of raw material: the medicine that in the leaf wood raw material, adds following consumption:
Alkali 1-5%
Sodium-sulphur compound 1-6%
Auxiliary agent 0-0.1%
Drug dosage is that relative raw material oven dry weight calculates, and stirs 2-24 hour under normal temperature to 90 ℃ temperature;
---mesolow is handled: pretreated material is packed in the cavity charge containers, handled 3-15 minute under 210-220 ℃, 0.8mpa-2.20mpa pressure.
The present invention can require to select refining process according to last slurry, but can single hop also multistage defibrination.
The present invention compared with prior art has following advantage:
1, technology of the present invention makes fiber S after the explosion
1Layer segment destroys, S
1And S
2Slabbing is opened, and is easy to expose S like this in defibrination and pulping process
2Layer.Guaranteeing that paper pulp has the yield of high yield pulp, have the intensity of chemical pulp, and have good whiteness and bleachability.
2, process equipment of the present invention is simple, adopts the mesolow explosion, and refining energy consumption is low, the yield height of slurry, and whiteness is higher, and intensity can match in excellence or beauty with chemical pulp, pollutes few.But medium-to-high grade paper cultural papers such as manufactured copper body paper, writing paper, copy paper, high-grade cardboard.
3, technology of the present invention is under the condition that guarantees the high yield of slurry, and refining energy consumption is low, and paper pulp has or near the intensity of chemical pulp, and has higher whiteness and good bleachability.Simultaneously, this operation pressure is little, temperature is low, the processing time is short, dosage is little, so the slurrying cost is low, and technology is simple, and pollutional load is light.But waste water is reuse after simple process.
The specific embodiment
With eucalyptus raw material of thunder woods is example:
---pretreatment of raw material: the medicine (drug dosage is that relative raw material oven dry weight calculates) that in raw material, adds following consumption:
Caustic soda 5%
Inferior sodium 6%
JFC bleeding agent 0.1%
Under 80 ℃ of temperature, stirred 2 hours;
---mesolow is handled: pretreated material is packed in the cavity charge containers, handled 8 minutes under 210 ℃, 2.20mpa pressure;
---spurt: raw material moment explosion is spurted to receiving vessel;
---2 sections defibrinations;
---making beating is to 55 ° of SR.
Obtain pulp brightness 50%, yield 83%, fracture length 6800M, tear index 6.35mN.m
2/ g, burst index 2.58kPa.m
2/ g.
Claims (1)
1, a kind of leaf wood mesolow Demolition Pulping method is characterized in that comprising the steps:
---pretreatment of raw material: the medicine that in the leaf wood raw material, adds following consumption:
Alkali 1-5%
Sodium-sulphur compound 1-6%
Auxiliary agent 0-0.1%
Drug dosage is that relative raw material oven dry weight calculates, and stirs 2-24 hour under normal temperature to 90 ℃ temperature;
---mesolow is handled: pretreated material is packed in the cavity charge containers, handled 3-15 minute under 210-220 ℃, 0.8mpa-2.20mpa pressure;
---spurt: raw material moment explosion is spurted to receiving vessel;
Described alkali refers to wherein one or more mixtures of NaOH, sodium carbonate, lime; Described sodium-sulphur compound refers to wherein one or more mixtures of sodium thiosulfate, dithionate, polysulfide, sodium sulfite, vulcanized sodium; Described auxiliary agent refers to surface reactive material one or more mixtures wherein of high temperature resistant, the anti-highly basic of nonionic or anionic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02115318 CN1201046C (en) | 2002-06-03 | 2002-06-03 | Middle-or low-pressure exposion method for making pulp with broad-leaf wood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02115318 CN1201046C (en) | 2002-06-03 | 2002-06-03 | Middle-or low-pressure exposion method for making pulp with broad-leaf wood |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1397683A CN1397683A (en) | 2003-02-19 |
| CN1201046C true CN1201046C (en) | 2005-05-11 |
Family
ID=4743577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02115318 Expired - Fee Related CN1201046C (en) | 2002-06-03 | 2002-06-03 | Middle-or low-pressure exposion method for making pulp with broad-leaf wood |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1201046C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107618210A (en) * | 2017-09-21 | 2018-01-23 | 安吉志达包装厂 | A kind of manufacturing process of high-strength corrugated board |
| CN109537342A (en) * | 2018-11-08 | 2019-03-29 | 福建省青山纸业股份有限公司 | A kind of sulphate pulp processes adding sodium sulfite |
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2002
- 2002-06-03 CN CN 02115318 patent/CN1201046C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1397683A (en) | 2003-02-19 |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050511 Termination date: 20120603 |