CN101024924A

CN101024924A - Method for producing unbleached sulfurate Larix gemelini slurry

Info

Publication number: CN101024924A
Application number: CN 200610038439
Authority: CN
Inventors: 周建平
Original assignee: JINKE PAPER-INDUSTRY Co Ltd ZHENJIANG
Current assignee: JINKE PAPER-INDUSTRY Co Ltd ZHENJIANG
Priority date: 2006-02-22
Filing date: 2006-02-22
Publication date: 2007-08-29

Abstract

The invention relates to a production process of using larch leftover material as raw material to make pulp and then washing and screening, belonging to the pulp making process application technical field. And the invention is an unbleached larch Kraft pulp production process and its raw material purchase: buying larch leftover material and using larch sapwood; its material preparing process: cutting off raw material, cleaning dust, screening, and putting into pot; and its cooking process: according to the process conditions, heating while adding the ready-prepared medicinal solution in the pot and after the putting into pot ends, according to the process requirements, cooking and placing the pot and making coarse pulp; and its screening process: using reed wood pulp production line to make washing, screening, condensing, and certain regulation on aperture of the original sieve; and its pulp making process: distributing pulp, dehydrating, drying, cutting, and packing. And its advantages: total production quantity is raised, the product structure is regulated into a production structure of combining long and short fibers, and using larch sapwood can make its yield and intensity better than using whole material.

Description

The production technology of unbleached sulfurate Larix gemelini slurry

Technical field the present invention relates to is that the leftover pieces of unbleached sulfurate Larix gemelini slurry are raw pulp, and the production technology of washing then, screen, manufacturing paper with pulp belongs to the pulping process applied technical field.

Background technology people utilize whole timber slurrying, its processing step branch technology (1) of getting the raw materials ready: after the peeling of raw material whole timber, through belt feeding, handle by chipping machine, be cut into 4-6 centimetre length, cyclone dust collectors are removed impurity such as dust wherein then, and the raw material of slicing treatment being crossed by screening installation filters out the raw material that the comparison homogeneous meets instructions for use again, be transported to feed bin by belt, again by the feed bin digester of directly packing into; Digesting technoloy (2) is according to the good cooking liquor of different preparation of raw material, and alkali is than 15-25%, with Na ₂The O meter, sulphidity 15-25%, digesting assistant 0-0.05%, liquor ratio 1: 4.5-5.2, fluid temperature 80-95 ℃, in the dress pot, progressively add cooking liquor, an amount of simultaneously steam that feeds, after the dress pot finishes, begin to heat up, heated up maximum temperature 145-175 ℃ total time 90-150 minute, temperature retention time 90-150 minute, total head was spurted and is entered spraying pot after boiling finished; Wash screening technology (3): the thick slurry after spurting is carried out three sections countercurrent washings, and washing residual alkali content is the 0.5-0.8 grams per liter, and the shower water temperature is provided with 40-60 ℃, concentrates at last, and 18-22 ℃ of slurry concentration control is screened through sieve again; Copy sizing process (5): the slurry after washing riddler's skill is surfed the Net and is manufactured paper with pulp, earlier through the even cloth slurry of overcurrent case, enter wet end dehydration moulding then, its middle water level should reach 0.15-0.5 rice, and concentration 1.5-3.0% enters press section and further dewaters, enter cylinder dried at last, temperature is arranged on 50-110 ℃, makes into the pulpboard mass dryness fraction greater than 78%, again to becoming pulpboard to cut, manage slurry, packing.

The objective of the invention is on the basis of existing technology, the leftover pieces after the purchase larch processing improve washing riddler's skill (3), utilize the reed wood pulp production line to produce long fine wood pulp, especially provide a new slurry field of using for larch processing back waste material.

Summary of the invention technical solution of the present invention:

1, the production technology of unbleached sulfurate Larix gemelini slurry, its processing step divides raw material purchase (1), the technology of getting the raw materials ready (2), digesting technoloy (3) is washed riddler's skill (4), copies sizing process (5), wherein raw material purchase (1): the import larch is whole wood, after being split into the lumps of wood, with the leftover pieces peeling of remainder, concentric acquisition; The technology of getting the raw materials ready (2): with raw material process belt feeding, handle by chipping machine, be cut into 4-6 centimetre length, cyclone dust collectors are removed impurity such as dust wherein then, the raw material of slicing treatment being crossed by screening installation filters out the raw material that the comparison homogeneous meets instructions for use again, be transported to feed bin by belt, again by the feed bin digester of directly packing into; Digesting technoloy (3): according to the good cooking liquor of different preparation of raw material, alkali is than 13-21%, in Na2O, sulphidity 5-15%, digesting assistant 0-0.05%, liquor ratio 1: 4.5-5.2, fluid temperature 80-95 ℃, in the dress pot, progressively add cooking liquor, an amount of simultaneously steam that feeds, after the dress pot finishes, begin to heat up, heated up maximum temperature 145-175 ℃ total time 60-120 minute, temperature retention time 0-30 minute, total head was spurted and is entered spraying pot after boiling finished; Copy sizing process (5): the slurry behind bleaching process is surfed the Net and is manufactured paper with pulp, earlier through the even cloth slurry of overcurrent case, enter wet end dehydration moulding then, its middle water level should reach 0.15-0.5 rice, and concentration 1.5 3.0% enters press section and further dewaters, enter cylinder dried at last, temperature is arranged on 50-110 ℃, makes into the pulpboard mass dryness fraction greater than 78%, again to becoming pulpboard to cut, manage slurry, packing; Its feature is characterized in that: the purchasing of raw materials (1), and conventional is to utilize whole wood, what our company utilized is the leftover pieces of larch processing industry, is the sapwood part of whole wood, and its peeling back is utilized; Wash riddler's skill (4), after digesting technoloy finishes, slurry spurts and enters spraying pot, spurting slurry concentration is 8-10%, through third wash, concentrated, wherein washs water temperature and is arranged on 40-60 ℃, in the slurry in the raffinate alkali content be controlled at the 0.25-0.5 grams per liter, concentrate mass dryness fraction at 18-22%, utilize the production line of former reed wood pulp to wash sieve, will use after the transformation of original CX sieve screen-aperture.

2, produce unbleached sulfurate Larix gemelini slurry: the wherein purchasing of raw materials (1), with the leftover pieces concentric acquisition of larch processing industry, utilize its peeling back; Wash riddler's skill (4), after digesting technoloy finishes, slurry spurts and enters spraying pot, and spurting slurry concentration is 8-10%, through third wash, concentrated, wherein wash water temperature and be arranged on 40-60 ℃, in the slurry in the raffinate alkali content be controlled at the 0.25-0.5 grams per liter, concentrate mass dryness fraction at 18-22%, utilize the production line of former reed wood pulp to wash sieve, to use after the transformation of original CX sieve screen-aperture, the screening disposed slurry send pulp machine to manufacture paper with pulp.

Advantage of the present invention:

1, this discarded object of development and use import larch leftover pieces has improved the larchen utilization rate of import, meets requirements of green environmental protection, can walk the road of sustainable development.

2, realized the long fine wood pulp of self-control true qualities, the long fine wood pulp of alternative part import true qualities; The black digestion liquid performance improvement helps the raising of alkali recovery and the production run that alkali reclaims simultaneously.Carrying out having realized batch process on original pulping system of appropriate reconstruction, having favorable economic benefit and social benefit widely.

3, this product is as producing aspects such as brown paper, boxboard, sack kraft paper, and the made slurry of more domestic imported waste paper all obtains by a relatively large margin raising at key indexs such as intensity, dirt counts, is a kind of very promising slurry kind.

Specific embodiment embodiment:

1 restrains larches with 1000 cuts off, chips and get the raw materials ready, and puts in the digester, adds alkali 160 gram (Na then ₂0), akali sulphide 40 gram, digesting assistant 0.5 gram, to add water 5000 grams, heating-up time be that 120 minutes, maximum temperature are controlled at 170 ℃, it is back with 40 ℃ of hot washes, screening the pulp to put pot, to very starch to concentrate and keep mass dryness fraction 20%, again slurry is diluted, enter and copy slurry, online concentration 1.5%, 0.3 meter of water level, set dryer temperature and carry out drying at 90 ℃, this product can be widely used as the raw material of producing brown paper, boxboard, sack kraft paper.

Claims

1, the production technology of unbleached sulfurate Larix gemelini slurry, its processing step branch: raw material purchase (1), the technology of getting the raw materials ready (2), digesting technoloy (3) is washed riddler's skill (4), copy sizing process (5), wherein raw material purchase (1): the import larch is for whole wood, after being split into the lumps of wood, with the leftover pieces of remainder, raw material is removed the peel in concentric acquisition; The technology of getting the raw materials ready (2): with raw material process belt feeding, handle by chipping machine, be cut into 4-6 centimetre length, cyclone dust collectors are removed impurity such as dust wherein then, the raw material of slicing treatment being crossed by screening installation filters out the raw material that the comparison homogeneous meets instructions for use again, be transported to feed bin by belt, again by the feed bin digester of directly packing into; Digesting technoloy (3): according to the good cooking liquor of different preparation of raw material, alkali is than 15-25%, in Na2O, sulphidity 15-25%, digesting assistant 0-0.05%, liquor ratio 1: 4.5-5.2, fluid temperature 80-95 ℃, in the dress pot, progressively add cooking liquor, an amount of simultaneously steam that feeds, after the dress pot finishes, begin to heat up, heated up maximum temperature 145-175 ℃ total time 90-150 minute, temperature retention time 90-150 minute, total head was spurted and is entered spraying pot after boiling finished; Copy sizing process (5): the slurry after washing riddler's skill (4) is surfed the Net and is manufactured paper with pulp, earlier through the even cloth slurry of overcurrent case, enter wet end dehydration moulding then, its middle water level should reach 0.15-0.5 rice, and concentration 1.5-3.0% enters press section and further dewaters, enter cylinder dried at last, temperature is arranged on 50-110 ℃, makes into the pulpboard mass dryness fraction greater than 78%, again to becoming pulpboard to cut, manage slurry, packing; It is characterized in that raw material purchase (1): purchase be the leftover pieces of larch processing industry, utilization be larchen sapwood part; Wash riddler skill (4): utilization be the reed wood pulp production line, with original CX sieve, its screen-aperture is amplified the back use, carry out three sections countercurrent spray washings, water temperature is provided with 40-60 ℃, washs residual alkali content at the 0.25-0.5 grams per liter, through concentrating, starch the dense 10-20% that is controlled at again;

2, according to claim 1, the production technology of unbleached sulfurate Larix gemelini slurry is characterized in that: the purchasing of raw materials (1), and conventional is to utilize whole wood, what our company utilized is the leftover pieces of larch processing industry, is the sapwood part of whole wood, and its peeling back is utilized; Wash riddler's skill (4), after digesting technoloy finishes, slurry spurts and enters spraying pot, spurting slurry concentration is 8-10%, through third wash, concentrated, wherein washs water temperature and is arranged on 40-60 ℃, in the slurry in the raffinate alkali content be controlled at the 0.25-0.5 grams per liter, concentrate mass dryness fraction at 18-22%, utilize the production line of former reed wood pulp to wash sieve, will use after the transformation of original CX sieve screen-aperture.