CN102953284A - Corn straw raw material used for paper making - Google Patents
Corn straw raw material used for paper making Download PDFInfo
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- CN102953284A CN102953284A CN2012104904059A CN201210490405A CN102953284A CN 102953284 A CN102953284 A CN 102953284A CN 2012104904059 A CN2012104904059 A CN 2012104904059A CN 201210490405 A CN201210490405 A CN 201210490405A CN 102953284 A CN102953284 A CN 102953284A
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Abstract
The invention relates to a corn straw raw material used for paper making. The corn straw raw material used for the paper making is selected from the corn straw harvested in the corn mature period, and the water content of the corn straw raw material used for the paper making is 15-45%. The corn straw raw material used for the paper making comprises separated peel, pulps and leaves, wherein the peel content is 25-35wt%, the leaf content is 55-60wt%, the pulp content is 3-7wt%, and the balance is other components. According to the corn straw raw material used for the paper making, which is disclosed by the invention, the problems of storage and transportation can be better solved, the use performance is improved, and the corn straw raw material used for the paper making can be widely used for the paper making field. The application field of the corn straw raw material is widened, the use value is improved, the corn straw raw material can be purchased on a large scale, and the large-scale industrial utilization is realized.
Description
Technical field
The present invention relates to a kind of maize straw raw material of tying shape, relate to specifically the paper grade (stock) maize straw raw material after a kind of process.
Background technology
China is one of the abundantest country of stalk resource in the world, and the output of annual all kinds of agricultural crop straws reaches more than 700,000,000 t.Corn is as one of Three major grain crops, and the annual production of its byproduct maize straw reaches about 2.5 hundred million t, accounts for 30% more than of all kinds of agricultural crop straw total amounts, is only second to the U.S. in the world and occupies second.
The output of maize straw is so abundant, is not but rationally effectively utilized all the time.The mode of past people Treating straw is that small part is as the material of warming ﹠ cooking or the roughage of ruminant, major part abandon in ground or on-site incineration, Dark smoke billows, not only contaminated environment, destruction traffic, and production, life, the property of returning people bring threat.Along with growing in intensity of the progress of science and technology and resource, energy crisis; the Chinese government and the people recognize the importance of rationally utilizing agricultural crop straw; took much count of up till now the comprehensive utilization of agricultural crop straw from about 1980, many enterprises, scientific research institute and colleges and universities are all in the new way of seeking the maize straw comprehensive utilization always.At present maize straw all has utilization in various degree in plant husbandry, animal husbandry and industrial production, but because the restriction of technical merit and machining level, and the utilization of maize straw is still belonged to the roughing stage.Most of utilize for be whole strain stalk, whole strain is processed, its crust and the mutually mutual interference of interior flesh have brought insoluble obstacle for many methods of utilizing.
And because the maize straw stem stalk of whole strain harvesting is thick and stiff, natural density is little, and (the dried maize straw density of stacking through the measuring and calculating nature only is 35～45kg/m
3), therefore, adopt the maize straw of whole strain results to store and transportation is a great problem, usually because the existence of moisture so that cost of transportation increases, and store and transportation in cause a large amount of rotten, thereby limited its application.The way of both economical practicality is silk while gathering in, and it is soft in small, broken bits that the stalk quality after the silkization becomes, and natural resiliency reduces greatly.Adopt the hydraulic pressure packaging technique, with the compression of the stalk behind silk packing, form the square bale of high density, profile rule.Be conducive to storage and the transportation of stalk, can the substitute feed grass as the grain rations of surviving the winter of cattle and sheep, also can long distance transportation as the raw material of industry.
Maize straw is rubbed a technology, the bundling technology is a kind of novel straw processing method that developed recently gets up, " maize straw is rubbed the development of silk, bundling outfit " (Xinjiang agricultural machanization, the 2nd phase in 2008) discloses a kind of maize straw and rubbed silk, bundling outfit; (science and technology of the farm machinery is promoted " the careless technology of silk system is rubbed in maize straw mechanization ", 2004.11) a kind of maize straw rubbing technology proposed, becoming traditional horizontal guillotine cutting of maize straw rubs into vertically squeezing silk, the maize straw rubbing is become soft thread forage grass, maize straw has destroyed the stalk epidermal structure after squeezing the silk rubbing, make forage grass soft, good palatability can improve grazing rate.
Yet it is rear for forage grass that above-mentioned technology only limits to that maize straw is squeezed silk, greatly limited its range of application.And owing to adopt and above-mentionedly flesh not removed when rubbing a thread technology, contain the whole flesh of maize straw in the corn stalk skin of the filament that processing obtains, and owing to contain a certain amount of xylan class hemicellulose in the flesh, this class hemicellulose is under the effect of illumination and oxygen, be easy to oxidized generation carbonyl chromophore and carboxyl auxochrome, when being used for papermaking, can cause serious brightness reversion phenomenon; And because the effect of flesh self fragility, the existence of a large amount of fleshes is so that the tear index of paper has decline to a certain degree.
Like this, how skin, flesh and the leaf with maize straw separates on a large scale, improves serviceability, so that a kind of maize straw raw material of performance improvement to be provided, to widen its Application Areas, improves value, just becomes the key link of maize straw raw material comprehensive utilization.
Summary of the invention
For addressing the above problem, the object of the present invention is to provide a kind of paper grade (stock) maize straw raw material, not only can solve well the problem that stores and transport, and can be widely used in field of papermaking, improve serviceability, widened Application Areas, improved value, can be purchased in large quantity, be realized the heavy industrialization utilization.
For achieving the above object, the present invention adopts following technical scheme:
A kind of paper grade (stock) maize straw raw material, wherein, described paper grade (stock) maize straw raw material is taken from the maize straw of corn maturity period results; The moisture of the maize straw raw material of described bundle shape is 15～45%; The maize straw raw material of described bundle shape comprises skin, flesh and the leaf of separation at least, and the content of wherein said skin is 25～35wt%, and the content of leaf is 55～60wt%, and the content of flesh is 3～7wt%, and surplus is other components.
When rubbing a thread technology, available technology adopting flesh is not removed, contain the whole flesh of maize straw in the corn stalk skin of the filament that processing obtains, and owing to contain a certain amount of xylan class hemicellulose in the flesh, this class hemicellulose is under the effect of illumination and oxygen, be easy to oxidized generation carbonyl chromophore and carboxyl auxochrome, when being used for papermaking, can cause serious brightness reversion phenomenon; And because the effect of flesh self fragility, the existence of a large amount of fleshes is so that the tear index of paper has decline to a certain degree.Remove a part of flesh among the present invention, can improve the performance of paper through the existence of a small amount of flesh of evidence.
Among the present invention, described suitcase is drawn together straw skin and the maize straw skin silk of strip.
Among the present invention, the content of the straw skin of described strip is 10～15wt%, and the content of described maize straw skin silk is 15～20wt%.
Among the present invention, described straw skin silk comprises the straw skin silk one by one and the straw skin tow that is incorporated on the skin after the skin flesh separates; The length of the straw skin of described strip is not more than 45cm.
Among the present invention, described straw skin tow is included in the straw skin tow that tubercle position and leather block close or the straw skin silk that is incorporated into the partial continuous on the skin.
Among the present invention, on the described skin along the slight crack that the straw skin silk that forms partial continuous is arranged on the stalk longitudinal direction.
Among the present invention, described flesh comprise on the free flesh that breaks away from outside skin and the skin remaining do not peeled off in conjunction with flesh.
Among the present invention, the content of described free flesh is 2.5～4.5wt%, and described content in conjunction with flesh is 0.5～2.5wt%.
Among the present invention, described free flesh is graininess or bulk.
Paper grade (stock) maize straw raw material of the present invention adopts following process route to obtain:
The maize straw that the corn maturity period is gathered in the crops obtains through the mechanical means of pushing, silk is rubbed, tears, blends or rubbed to stone roller with the hands; Be preferably after agricultural harvester harvesting, skin flesh leaf separate, collection obtains when being 15～45% to moisture; More preferably after agricultural harvester harvesting, skin flesh leaf separate, in the fields airing or air-dryly collect that bundling obtains when being 15～45% to moisture.
Because push, grind in the mechanical processes such as rubbing, tear, blend or rub silk with the hands, a part of flesh and/or leaf become very little chip, broken end.Other components described in the present invention are these chips, broken end etc., and it can't distinguish flesh or leaf.
Realize that above-mentioned technical process reasonable selection corollary equipment is crucial, the equipment of processing on the market at present agricultural crop straw is a lot, but will note supporting science, reasonability when selecting, and makes the equipment performance maximum efficiency of apolegamy, guarantee the continuity of production, reach the optimum productivity index.Owing to be the crop stem of harvesting in the field, therefore will select can be at the equipment of limit, field walking edge work, with the conveniently moving that guarantees equipment, flexibly, realizes farm work.The present invention selects agricultural harvester, also can realize the separation of skin flesh leaf in harvesting.And at the supporting skin flesh leaf separator of agricultural harvester installation, this device can adopt multiple mechanical type, adopts extruding, grind multiple mechanical means such as rubbing, tear, blend, rub silk with the hands, thereby reaches the technique effect with the skin flesh leaf separation of maize straw.Stalk after the present invention will process is in the field airing, impact by factors such as air oxidation, ultraviolet ray irradiations, thereby play the effect of sterilization, make the maize straw raw material for preparing be difficult for going mouldy, shelf-life prolongs, and can accelerate the oxidation Decomposition of sugar in the stalk, Protein components, thereby further reduces the content of impurity in the fibrous raw material, further improve cellulosic content, thereby more adapt to the commercial Application such as papermaking.
Preferred agricultural harvester of the present invention comprises chassis 4, power set, electric device, hydraulic system, driver's cabin 5, the receipts stem ceding of Taiwan 1 of harvesting corn stalk, maize straw is torn, blend, and with skin, flesh, the maize straw skin flesh leaf separator 3 that leaf separates, maize straw under the harvesting is transported to maize straw is torn, blend and with skin, flesh, the defeated stem device 2 of the maize straw skin flesh leaf separator 3 that leaf separates, between each structure or each structure directly use securing member to connect with the chassis, guarantee bonding strength, avoid in the process of harvesting corn stalk, accident occurring.
Described maize straw skin flesh leaf separator 3 comprise be used to the axial-flow type drum 11 of tearing, blend maize straw and separating corn straw skin flesh leaf be used to leak down to separate after flesh and the sieve 12 of leaf.
Described axial-flow type drum 11 is provided with a plurality of teeth be used to tearing, blend maize straw and separating corn straw skin flesh leaf.
Described tooth is one or more in screw-shaped bar tooth, spike tooth or the dull and stereotyped tooth.
Described sieve 12 is provided with a plurality of maize straw fleshes of separation and holes that leaf passes through of supplying.
The described receipts stem ceding of Taiwan 1 is provided with cutter A, the downward-sloping certain angle of described cutter A along continuous straight runs, the maize straw that can avoid like this being cut off by cutter A is not cut by cutter when also not entering harvester again, can not enter harvester and blends so that one section stalk drops to ground.
Described maize straw skin flesh leaf separator 3 also comprises straw skin dispersal device 6 and anti-block apparatus 7.
Straw skin dispersal device 6 can be avoided maize straw skin to be sticked together and guide maize straw skin to be scattering into a side of harvester, can avoid like this trailing wheel of harvester to roll the straw skin that is scattering into the ground, better to store up.Because harvesting time, the moisture of maize straw was higher, the flesh after the separation and leaf are all very moist, be easy to occur alluvial and stop up behind 12 the hole of sifting out, and have had anti-block apparatus 7 can allow the flesh of separator well and leaf fall very smoothly.
Described agricultural harvester also comprises receives stem cutting table auger 8, chain harrow assembly 9, cut flow roller 10, oscillating screen plate 13, distributes screw feeder 14 and fan 15.
Realize the tearing of maize straw, blend and the separating of skin, flesh, leaf that the rotating speed of axial-flow type drum d is very crucial, among the present invention, the rotating speed of described axial-flow type drum 11 is 900～1000r/min, preferred 950～1000r/min.
Obtain good separating effect, according to the crop situation, the gap that regulates between axial-flow type drum 11 and the sieve 12 is very important, the fourth gear gap is arranged for this reason, be 5mm, 10mm, 15mm, 20mm, when crop is moist, use little gap between axial-flow type drum 11 and the sieve 12, when crop is dry, use large gap between cylinder and the sieve.
Compared with prior art, the present invention has following advantage:
(1) maize straw (whole bar) can not be purchased in enormous quantities, can't realize the large-scale industry utilization; Paper grade (stock) maize straw raw material of the present invention can be purchased in enormous quantities, can realize the heavy industrialization utilization, can be widely used in field of papermaking;
(2) maize straw (whole bar) transportation, bearing capacity are low, and the maize straw raw material transportation of bundle shape of the present invention, bearing capacity are high, the vehicle of equal transport power, each car 13 tons of maize straws (whole bar) of only freighting; The maize straw raw material of bundle shape of the present invention then can fill 35 tons;
(3) store same homalographic, stack same height, maize straw (whole bar) only can be deposited 350 kilograms/square metre, and the maize straw raw material of bundle shape of the present invention can be deposited 1 ton/square metre;
(4) peasant with harvest corn after, will be behind the corn straw smashing field (rotary tillage) also, expense: 150 yuan/mu; Reclaimed by industrialization straw harvesting, separation, packing, the soil rotary tillage obtains the maize straw raw material of bundle shape of the present invention, the total expense: 100 yuan/mu.
Description of drawings
Fig. 1 is the structure chart of agricultural harvester of the present invention;
Fig. 2 is that maize straw is carried schematic diagram among the present invention;
Fig. 3 is straw skin dispersal device and anti-block apparatus installation site schematic diagram in the corn picker of the present invention;
Wherein:
1---receiving the stem ceding of Taiwan, 2---defeated stem device, 3 meters straw skin flesh leaf separators, 4---the chassis, 5---driver's cabin, 6---the straw skin dispersal device, 7---anti-block apparatus, 8---receive the stem cutting table auger, 9---the chain harrow assembly, 10---cut flow roller, 11---axial-flow type drum, 12---sieve, 13---oscillating screen plate, 14---distribute screw feeder, 15---fan.
The specific embodiment
Below be the specific embodiment of the present invention, described embodiment is in order to further describe the present invention, rather than restriction the present invention.
Embodiment 1
A kind of moisture of paper grade (stock) maize straw raw material is 15%; Described paper grade (stock) maize straw raw material comprises skin, flesh and the leaf of separation at least, and the content of wherein said skin is 35wt%, and the content of leaf is 55wt%, and the content of flesh is 3wt%, and surplus is other components.
Above-mentioned paper grade (stock) maize straw raw material adopts following process route to obtain:
With the maize straw of corn maturity period results through agricultural harvester of the present invention (as depicted in figs. 1 and 2) gather in, after skin flesh leaf separates, bundling obtained when airing to moisture was 15% in the fields.
Referring to Fig. 1 and Fig. 2, the agricultural harvester that present embodiment adopts comprises chassis 4, power set, electric device, hydraulic system, driver's cabin 5, the receipts stem ceding of Taiwan 1 of harvesting corn stalk, maize straw is torn, blend, and with skin, flesh, the maize straw skin flesh leaf separator 3 that leaf separates, maize straw under the harvesting is transported to maize straw is torn, blend and with skin, flesh, the defeated stem device 2 of the maize straw skin flesh leaf separator 3 that leaf separates, between each structure or each structure directly use securing member to connect with the chassis, guarantee bonding strength, avoid in the process of harvesting corn stalk, accident occurring.
Described maize straw skin flesh leaf separator 3 comprise be used to the axial-flow type drum 11 of tearing, blend maize straw and separating corn straw skin flesh leaf be used to leak down to separate after flesh and the sieve 12 of leaf.
Described axial-flow type drum 11 is provided with a plurality of teeth be used to tearing, blend maize straw and separating corn straw skin flesh leaf.
Described tooth is one or more in screw-shaped bar tooth, spike tooth or the dull and stereotyped tooth.
Described sieve 12 is provided with a plurality of maize straw fleshes of separation and holes that leaf passes through of supplying.
The described receipts stem ceding of Taiwan 1 is provided with cutter A, the downward-sloping certain angle of described cutter A along continuous straight runs, the maize straw that can avoid like this being cut off by cutter A is not cut by cutter when also not entering harvester again, can not enter harvester and blends so that one section stalk drops to ground.
Described agricultural harvester also comprises receives stem cutting table auger 8, chain harrow assembly 9, cut flow roller 10, oscillating screen plate 13, distributes screw feeder 14 and fan 15.
Realize the tearing of maize straw, blend and the separating of skin, flesh, leaf that the rotating speed of axial-flow type drum d is very crucial, in the present embodiment, the rotating speed of described axial-flow type drum 11 is 950r/min.
Obtain good separating effect, according to the crop situation, the gap that regulates between axial-flow type drum and the sieve is very important, the fourth gear gap is arranged for this reason, be 5mm, 10mm, 15mm, 20mm, when crop is moist, use little gap between axial-flow type drum and the sieve, when crop is dry, use large gap between cylinder and the sieve.Operation process is: be grown in the maize straw in the farmland, behind corn stage of wax ripeness harvesting corn, stalk is cut off by the receipts stem ceding of Taiwan 1 of agricultural harvester and enters into defeated stem device 2 by the receipts stem cutting table auger 8 in the ceding of Taiwan, stalk is delivered to cut flow roller 10 by the chain harrow assembly 9 in the defeated stem device 2 with the stalk that cuts off, stalk is thrown into maize straw skin flesh leaf separator 3 by cut flow roller 10, by the axial-flow type drum 11 of maize straw skin flesh leaf separator 3 and the effect of sieve 12 maize straw is torn, be divided into the stalk crust of strip, irregular block flesh and scutellate blade.Because the degree that maize straw is torn in being torn process is different, it is very wide that the stalk crust of strip has, and forms the maize straw skin of strip; What have is then very thin, forms the maize straw skin silk.And in the maize straw skin silk, what have is combined with skin graft, and what have is not combined with skin graft; In conjunction with the skin silk at least in stalk tubercle part in conjunction with forming tow, what be not combined with skin graft then forms one by one filament shape skin silk.The slight crack of high-visible formation straw skin silk on the skin graft.Simultaneously, because the degree that is torn is different, the flesh on the maize straw skin partly is stripped from formation and is broken away from free flesh in skin graft, and part be not stripped from formation be attached on the skin graft in conjunction with flesh.Irregular block flesh and scutellate blade fall by the hole that the maize straw flesh that Gong separates and leaf pass through is set on the sieve 12, by distributing screw feeder 14 that it is delivered to the shake sieve plate 13 at harvester rear, flesh and blade act on the discharge of agricultural harvester rear by the shake of fan 15 and shake sieve plate 13, the stalk crust of strip is broken up rear discharge by straw skin dispersal device 6, fulfils assignment.
With stalk crust airing in the farmland of irregular block flesh, scutellate blade and strip, in the airing process, irregular block flesh partly becomes graininess, and scutellate blade also part becomes chip; Sampling detects carries out the bundling collection when moisture is 15%.
The content of the straw skin of described corn strip is 15wt%, and the content of described maize straw skin silk is 20wt%.The content of described free flesh is 2.5wt%, and described content in conjunction with flesh is 0.5wt%.
Embodiment 2
A kind of moisture of paper grade (stock) maize straw raw material is 45%; Described paper grade (stock) maize straw raw material comprises skin, flesh and the leaf of separation at least, and the content of wherein said skin is 25wt%, and the content of leaf is 60wt%, and the content of flesh is 7wt%, and surplus is other components.
Above-mentioned paper grade (stock) maize straw raw material adopts following process route to obtain:
With the maize straw of corn maturity period results through agricultural harvester of the present invention (as depicted in figs. 1 and 2) gather in, after skin flesh leaf separates, it is air-dry in the fields that bundling obtains when being 45% to moisture.
The employed agricultural harvester of present embodiment has further been set up straw skin dispersal device 6 and anti-block apparatus 7 on the basis of embodiment 1, referring to Fig. 3, its operation process is with embodiment 1.
Described straw skin dispersal device 6 is fixedly connected on the discharging opening of axial-flow type drum 11.Stalk crust by maize straw skin flesh leaf separator 3 isolated strips can present irregular arranging when being discharged on the ground, may be subject to rolling of rear wheel for harvester, because straw skin is hard and the fiber connectivity is good, phenomenon in heaps may occur simultaneously, be not easy to airing.So install straw skin dispersal device 6 additional, this device, is broken up straw skin and is had the guiding of device case that straw skin is broken up the ground of harvester one side uniformly by make the blade rotation in it with the kind of drive by cylinder, and is convenient to airing and bundling.
Described anti-block apparatus 7 is located at the bottom of sieve 12.If the leaf of the maize straw of harvesting and flesh are moist, moisture is high, then stalk is after the irregular block flesh that produces under the effect of axial-flow type drum and sieve and scutellate blade are leaking down sieve, may adhere on the inwall of harvester, along with its continuous accumulation can make the sieve hole plug, cause the separating effect of stalk to weaken.So install this anti-block apparatus additional, by distributing screw feeder as main transmission, the mode by chain gear transmission drives anti-block apparatus, at anti-block apparatus constantly under the effect, the flesh that sticks on the inwall and leaf is entered smoothly distribute in the screw feeder, finishes detached job.
The content of the straw skin of described corn strip is 10wt%, and the content of described maize straw skin silk is 15wt%.The content of described free flesh is 4.5wt%, and described content in conjunction with flesh is 2.5wt%.
In the present embodiment, the rotating speed of described axial-flow type drum 11 is 1000r/min.
Embodiment 3
A kind of moisture of paper grade (stock) maize straw raw material is 30%; Described paper grade (stock) maize straw raw material comprises skin, flesh and the leaf of separation at least, and the content of wherein said skin is 30wt%, and the content of leaf is 58wt%, and the content of flesh is 5wt%, and surplus is other components.
Above-mentioned paper grade (stock) maize straw raw material adopts following process route to obtain:
With the maize straw of corn maturity period results through agricultural harvester of the present invention (as depicted in figs. 1 and 2) gather in, after skin flesh leaf separates, it is air-dry in the fields that bundling obtains when being 30% to moisture.
Described agricultural harvester is with embodiment 1.
The content of the straw skin of described corn strip is 10wt%, and the content of described maize straw skin silk is 20wt%.The content of described free flesh is 4.5wt%, and described content in conjunction with flesh is 0.5wt%.
In the present embodiment, the rotating speed of described axial-flow type drum 11 is 980r/minmin.
A kind of moisture of paper grade (stock) maize straw raw material is 20%; Described paper grade (stock) maize straw raw material comprises skin, flesh and the leaf of separation at least, and the content of wherein said skin is 32wt%, and the content of leaf is 56wt%, and the content of flesh is 4wt%, and surplus is other components.
Above-mentioned paper grade (stock) maize straw raw material adopts following process route to obtain:
With the maize straw of corn maturity period results through agricultural harvester of the present invention (as depicted in figs. 1 and 2) gather in, after skin flesh leaf separates, bundling obtained when airing to moisture was 20% in the fields.
Described agricultural harvester is with embodiment 2.
The content of the straw skin of described corn strip is 14wt%, and the content of described maize straw skin silk is 18wt%.The content of described free flesh is 3.0wt%, and described content in conjunction with flesh is 1.0wt%.
In the present embodiment, the rotating speed of described axial-flow type drum 11 is 960r/min.
Test example 1
The maize straw raw material is stored up experiment
Adopt the paper grade (stock) maize straw raw material of experimental example 1 preparation of the present invention under identical condition, to store up comparative test with the maize straw raw material of prior art preparation:
Divide 3 batches with the maize straw raw material of embodiment 1 preparation, measure the content of water content, cellulose, hemicellulose and water-soluble sugar, measurement result is shown in Table 1:
Table 1
| ? | Water content (wt%) | Cellulose (wt%) | Hemicellulose (wt%) | Water-soluble sugar (wt%) |
| Batch 1 | 15 | 45 | 25 | 3 |
| Batches 2 | 30 | 40 | 20 | 3 |
| Batches 3 | 45 | 35 | 16 | 3 |
To the stalk of prior art, also measure the content of its water content, cellulose, hemicellulose and water-soluble sugar, measurement result is shown in Table 2:
Table 2
| ? | Water content (wt%) | Cellulose (wt%) | Hemicellulose (wt%) | Water-soluble sugar (wt%) |
| Contrast 1 | 47 | 32 | 26 | 12.2 |
| Contrast 2 | 50 | 33 | 26 | 12.7 |
Above-mentioned stalk bundling is become 330kg/m
3Bundle, then test:
1. hot conditions test
The above-mentioned stalk for preparing and is stored in the warehouse of clean, sealing, is 40 ℃ with the Temperature Setting in warehouse, and relative humidity is to place 15 days under 40 temperature, in sampling in the 5th day, the 10th day, the 15th day, detects the whether rotten of stalk sample.The results are shown in Table 3
Table 3
2. super-humid conditions experiment
The above-mentioned stalk for preparing, with store in the warehouse of clean, sealing, be 25 ± 2 ℃ with the Temperature Setting in warehouse, placed 15 days under the condition of relative humidity 90 ± 5%, in sampling in the 5th day, the 10th day, the 15th day, detect the whether rotten of stalk sample.The results are shown in Table 4:
Table: 4
3. hot and humid condition experiment
The above-mentioned stalk for preparing and is stored in the warehouse of clean, sealing, is 35 ± 2 ℃ with the Temperature Setting in warehouse, placed 30 days under the condition of relative humidity 70 ± 5%, at duration of test respectively at sampling in 5,10,20,30 days once,, detect the whether rotten of stalk sample.The results are shown in Table 5:
Table 5
Test example 2
Copy the paper contrast test
1, slurrying
Maize straw skin (being called for short contrast 2) employing caustic soda-anthraquinone method pulping way with the sarconeme shape structure of the maize straw skin (being called for short contrast 1) of the paper grade (stock) maize straw raw material of the embodiment of the invention 1 (being called for short test), " the maize straw skin flesh separates and pulp-making test " and " design of corn combine stalks rubbing baler for bank and emulation ", in the 15L revolving digester, carry out, heating-up time is since 25 ℃ of meters, 100 ℃ of little steam bleedings, alkali charge 16%(is with Na
2The O meter), liquor ratio 1:5,160 ℃ of maximum temperatures, heating-up time 90min, temperature retention time 60min, anthraquinone consumption 0.05%.
2, bleaching
This test adopts traditional CEH tri-stage bleaching mode that the corn stalk latex that above-mentioned raw materials obtains is bleached.---washing---alkali treatment (E)---washing---hypochlorite bleaching (H)---washing that technological process is: chlorination (C).Totally applied chlorine is 8%, and other technological parameters see Table 6.
Table 6, corn stalk latex bleaching process parameter
3, handsheet
The corn stalk latex that above-mentioned raw materials is obtained carries out the handsheet experiment with the automatic handsheet machine of PTI, quantitatively is 60g/m
2, quantitatively fluctuation is for ± 3.5%.
Measure whiteness, opacity, YI yellow index and pattern physical strength by the related standards method, measure and see Table 7.
Table 7, corn stalk skin bleached pulp performance test results
Compare with contrast 1, the prepared opacity of paper grade (stock) maize straw raw material of the present invention has certain decline, and the paper YI yellow index improves, but tensile index, burst index, tear index and folding strength are improved; Contrast 2 then since flesh do not remove, contain a large amount of fleshes in the raw material so that the tensile index of paper, burst index and tear index not as good as the present invention, may be because the effect of flesh self fragility, and the brightness reversion phenomenon is more serious.Therefore, the Papermaking Performance of paper grade (stock) maize straw raw material of the present invention be better than contrasting 1 and the contrast 2.
Paper grade (stock) maize straw raw material to the other embodiments of the invention gained has also carried out above-mentioned test, and the result of its acquisition is similar.
Claims (10)
1. a paper grade (stock) maize straw raw material is characterized in that, described paper grade (stock) maize straw raw material is taken from the maize straw of corn maturity period results; The moisture of described paper grade (stock) maize straw raw material is 15～45%; Described paper grade (stock) maize straw raw material comprises skin, flesh and the leaf of separation at least, and the content of wherein said skin is 25～35wt%, and the content of leaf is 55～60wt%, and the content of flesh is 3～7wt%, and surplus is other components.
2. paper grade (stock) maize straw raw material according to claim 1 is characterized in that, described suitcase is drawn together straw skin and the maize straw skin silk of strip.
3. paper grade (stock) maize straw raw material according to claim 2 is characterized in that, the content of the straw skin of described strip is 10～15wt%, and the content of described maize straw skin silk is 15～20wt%.
4. paper grade (stock) maize straw raw material according to claim 3 is characterized in that, described straw skin silk comprises the straw skin silk one by one and the straw skin tow that is incorporated on the skin after the skin flesh separates; The length of the straw skin of described strip is not more than 45cm.
5. paper grade (stock) maize straw raw material according to claim 4 is characterized in that, described straw skin tow is included in the straw skin tow that tubercle position and leather block close or the straw skin silk that is incorporated into the partial continuous on the skin.
6. paper grade (stock) maize straw raw material according to claim 5 is characterized in that, on the described skin along the slight crack that the straw skin silk that forms partial continuous is arranged on the stalk longitudinal direction.
7. paper grade (stock) maize straw raw material according to claim 1 is characterized in that, described flesh comprise on the free flesh that breaks away from outside skin and the skin remaining do not peeled off in conjunction with flesh.
8. paper grade (stock) maize straw raw material according to claim 7 is characterized in that, the content of described free flesh is 2.5～4.5wt%, and described content in conjunction with flesh is 0.5～2.5wt%.
9. paper grade (stock) maize straw raw material according to claim 8 is characterized in that, described free flesh is graininess or bulk.
10. the described paper grade (stock) maize straw of any one raw material according to claim 1-9, it is characterized in that described paper grade (stock) maize straw raw material obtains through the mechanical means of pushing, silk is rubbed, tears, blends or rubbed to stone roller with the hands for the maize straw with corn maturity period results; Be preferably after agricultural harvester harvesting, skin flesh leaf separate, collection obtains when being 15～45% to moisture; More preferably after agricultural harvester harvesting, skin flesh leaf separate, in the fields airing or air-dryly collect that bundling obtains when being 15～45% to moisture.
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| CN104928962A (en) * | 2015-04-27 | 2015-09-23 | 宁夏紫荆花纸业有限公司 | Method for pulping corn stalk as a raw material and making natural-color household paper |
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| CN104928962A (en) * | 2015-04-27 | 2015-09-23 | 宁夏紫荆花纸业有限公司 | Method for pulping corn stalk as a raw material and making natural-color household paper |
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