CN1078276A - The method of cotton bar machinery defibrator process seal carving brush paper pulp - Google Patents

Abstract

The invention discloses a kind of method of cotton bar machinery defibrator process seal carving brush paper pulp, can utilize existing fiberboard or the paper grade (stock) defibrator will be through cracking the cotton stalk of pulverizing, wear into thick slurry through going casting skin to handle after heat, again through the cold grinding pulping, and utilize defibrator process cooling washing simultaneously to come unstuck, cotton stalk moisture 30-40% preheating saturated vapour pressure is 0.2-0.25MPa during defibrator process, digestion time 1-1.5 minutes; The fast washing cooling of coming unstuck of defibrator abrasive disk space 0.05-0.1mm, blow-off valve discharge 50-60 times/minutes, the hot slurry after defibrator process, cold grinding pulping again, this method small investment can extensively be used in and have papermaking and fiberboard industry now, the slurrying cost is low.

Description

The method of cotton bar machinery defibrator process seal carving brush paper pulp

The present invention relates to the cotton stalk papermaking, exactly belong to a kind of method of cotton machinery hot-mill method seal carving brush paper pulp.

Existing cotton stalk process technology is to adopt to soak after the boiling washing defibrination in Cold grinder, perhaps utilizes the cotton stalk chemical pulp or the semi-chemical pulp of chemical pulping legal system.Its above-mentioned two kinds of method shortcomings are.Cold grinding method slurrying, need a large amount of water, and, cause a large amount of fibre cuttings during defibrination easily because of cotton stalk fiber can not get when the defibrination fully softeningly, fiber is short and thick, be difficult for to form than long fiber pulp,, need independent operation during cold grinding the cotton stalk processing of coming unstuck simultaneously because of pectin content height in the cotton stalk, it is big to add the investment of system new equipment, complex process, the pulping rate is low, and grinds general wrapping paper and the paperboard of the slurry system of can only copying; With chemical legal system cotton stalk pulp, itself have that slurry-outlet quantity is low, cost is high, complex process slurrying is to producing a large amount of waste water, environmental pollution is serious, and general little paper mill is also difficult handles waste water, and utilizes homemade complete fiberboard device fabrication printing paper pulp, at present also beyond example, particularly present domestic Fibreboard Production producer is depressed, and grinds cotton stalk printing paper pulp and reduce system paper cost with original equipment, reduces equipment investment; It is that China's paper-making industry is needed that equipment is made full use of.

The objective of the invention is to, provide and to make full use of existing cotton stalk resource, save timber, reduce cost, can utilize defibrator or the paper grade (stock) defibrator and the corollary equipment of existing processing fiber plate, directly will be through cracking the cotton stalk of pulverizing, after removing the casting skin processing, defibrator process becomes thick slurry, becomes mechanical pulp and utilize the defibrator process cooling to wash simultaneously the method for a kind of cotton bar machinery hot-mill method seal carving brush paper pulp that comes unstuck again through cold grinding.

The present invention is by wanting following mode to realize: behind cotton bar hulling, cracking machine with cotton stalk carries out cotton stalk and cracks, make crust be the cast tow shape, core bar is the sunflower seeds shape, marrow core in the casting skin layer of crust and the core bar is processed into sheet in small, broken bits and dust-like, go out marrow core and casting skin through screening and separating then, dust also separates immediately to be removed.

After will cotton stalk mixture removing casting skin marrow core and dust through cracking pulverizing, carry out mechanical heat grinding slurry through profit water or after soaking, it is characterized in that carrying out defibrination with defibrator, the cotton stalk mixture is in feed bin enters defibrator, the moisture content 30-40%, particularly moisture content of cotton stalk is 33-36% the best, the cotton stalk temperature of defibrator process, be no more than 130 ℃, the operating procedure parameter of its defibrator is:

1, the charging compression ratio of feed auger is 1: 1.5-2.5, particularly pressure ratio be 1: 2 for good.

2, to be full of steam pressure be 0.2-0.25MPa to the preheating of defibrator process cotton stalk.

3, cotton stalk preheating digestion time: 1-1.5 minute.

4, defibrator abrasive disk space 0.05-0.1mm.

5, defibrator discharge number of times is 50-60 time.

Through the slurry after the defibrator process in 1-2 minute fast washing come unstuck and cool to below 50 ℃, prevent high time of slurry temperature long can blackening and influence slurry whiteness and to bleaching bring be stranded accurate, slurry is milled to 52 ° of mechanical pulps more than the SR of beating degree with conventional method (Cold grinder) after concentrating, make printing paper with starching through bleaching, refining.

The defibrator that this method is used is fibre board use defibrator or paper grade (stock) defibrator.

The invention has the advantages that making full use of the existing cotton stalk resource of China produces printing paper saving timber, reduce cost, reduce the contaminated wastewater of chemical pulping, solved the special equipment of cotton stalk slurrying simultaneously, defibrator in the defibrator of available fibreboard made and the field of papermaking carries out defibrator process easily, it is little to have investment, instant effect, concrete technology and pulping problem in the cotton stalk slurrying have been solved, can soften the cotton stalk fiber lignin effectively, glassy cotton stalk lignin cover layer prevents to congeal into, fiber when having avoided grinding is short and thick, because of the fast cooling of defibrator process slurry, has avoided the rotten blackening that causes because of the defibrination temperature is too high effectively, guaranteed coming unstuck and cooling off synchronous water and save of cotton stalk defibrination process simultaneously, pulping rate height can be widely used in the transformation of domestic existing papermaking or fibre-board plant, and the printing paper of production is with slurry, conform with the system of copying of printing stationery, and can be used for the manufacturing of cardboard and wrapping paper in a large number.

Embodiment: the present invention is the cotton stalk with hulling, crack that machine cracks and remove casting skin, marrow core dust through hammer slice type through sorting, mixture after cotton stalk cracked enters defibrator and carries out mechanical heat grinding slurry from feed bin through soaking, its process conditions are: (1) requires the cotton stalk material water ratio is 30%-40%, and moisture is minimum must not to be lower than 30%; (2) the feed screw shaft compression ratio is 1: 1.5-2.5, and best charging compression ratio is 1: 2, purpose is to reduce the resistance of charging, it is non-slip when the cotton stalk material moves forward, improve inlet amount, guarantee that the cotton stalk material forms solid cotton stalk plug, regurgitates to stop pre-vapours; It is (3) full that to close steam pressure be 0.2-0.25MPa; The preheating digestion time is 1-1.5 minute, purpose is the quality that guarantees pulping, vapor (steam) temperature is long too high preheating time, can make the cotton stalk lignin that has softened attached on the fiber, will be condensed into glass cotton stalk lignin cover layer when slurry one cools off, give the bleaching of slurry and further finish grind and caused difficulty; The opposite time is short, and steam pressure is low, and the cotton stalk material can not get fully softening, and it is short and thick to cause fibre to push away during grinding, does not guarantee the defibrination quality, and discharge is also difficult; (4) the defibrator abrasive disk space is 0.05-0.1mm, and the discharge number of times is no more than 60 times/minute, and the best is 50-60 time/minute, and is even to guarantee defibrination, grinds out qualified slurry, reduces the loss of thermal source; (5) utilize fast fast cooling washing, the slurry of temperature about 120 ℃ that defibrator is ground, in 1-2 minute, cool to below 50 ℃ rapidly, because of the high time of slurry temperature long, the rotten blackening of defibrator process slurry is added to the difficulties to bleaching, the washing cooling helps coming unstuck fast simultaneously, and degumming rate can reach more than 80%.Defibrator process disposed slurry beating degree reaches 10-15SR °, dehydration back with conventional cold grinding to pulping beating degree more than 52SR °, through bleaching, can copying behind the refining and make printing paper pulp.As copy every performance of making newsprint with it, all reach existing GB A level set quota, this method is particularly suitable for making full use of and transforming of middle-size and small-size paper mill and fibre-board plant's equipment.

The defibrator that this method is used can be: make the defibrator as ∮ 600, ∮ 750, ∮ 915 of fibre board use, or the defibrator of paper making equipment.

Claims (5)

1, a kind of method of cotton bar machinery defibrator process seal carving brush paper pulp, cotton bar mixture through cracking pulverizing is gone to carry out mechanical heat grinding slurry behind casting skin and the marrow core, carry out defibrination with defibrator, the moisture content 30-40% of cotton stalk, the cotton stalk temperature of defibrator process is lower than 130 ℃, and its concrete technological parameter is as follows:

(1) the charging compression ratio of feed auger is 1: 1.5-2.5;

(2) defibrator process preheating steam pressure is 0.5-0.25MPa;

(3) cotton stalk preheating digestion time is 1-1.5 minute;

(4) defibrator abrasive disk space 0.05-0.1mm;

(5) defibrator discharge number of times is 50-60 time/minute;

Through the slurry after the defibrator process in 1--2 minute fast washing come unstuck and cool to below 50 ℃, slurry through concentrate the back with conventional method (Cold grinder) be milled to mechanical pulp more than beating degree 52SR °, through bleach, refining makes printing and starches.

2, in accordance with the method for claim 1, the charging compression ratio that it is characterized in that feed auger is 1.2.

3, in accordance with the method for claim 1, it is characterized in that the pre-vapours of defibrator process cotton stalk is the full steam that closes.

4, by the described way of claim 1, it is characterized in that defibrator is fine step defibrator.

5, in accordance with the method for claim 1, the moisture content of defibrator process cotton stalk is 33-36% the best.