CN102953284B - Corn straw raw material used for paper making - Google Patents
Corn straw raw material used for paper making Download PDFInfo
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- CN102953284B CN102953284B CN201210490405.9A CN201210490405A CN102953284B CN 102953284 B CN102953284 B CN 102953284B CN 201210490405 A CN201210490405 A CN 201210490405A CN 102953284 B CN102953284 B CN 102953284B
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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 corn stalk raw material of tying shape, relate to the paper grade (stock) corn stalk raw material after a kind of process specifically.
Background technology
China is one of country of enriching the most of stalk resource in the world, and the output of annual all kinds of agricultural crop straw reaches 700,000,000 more than 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 amount, is only second to the U.S. in the world and occupies second.
The output of maize straw is so abundant, is not but utilized by rationally effective all the time.The mode of past people Treating straw is the material of small part as warming & cooking or the roughage of ruminant, major part abandon in ground or on-site incineration, Dark smoke billows, not only contaminated environment, destroy traffic, return the production of people, life, property bring threat.Along with the progress of science and technology and resource, the growing in intensity of energy crisis; the Chinese government and the people recognize the importance of Appropriate application agricultural crop straw; took much count of the comprehensive utilization of agricultural crop straw up till now from about 1980, many enterprises, Research Center and colleges and universities are all in the new way finding maize straw comprehensive utilization always.Current maize straw all has utilization in various degree in plant husbandry, animal husbandry and industrial production, but due to the restriction of technical merit and machining level, still belongs to the roughing stage to the utilization of maize straw.Major part utilize for be whole strain stalk, whole strain is processed, and its crust and interior flesh disturb mutually, bring insoluble obstacle to many Application way.
And the maize straw stem stalk to gather in due to whole strain is thick and stiff, natural density is little, and (the Dry corn stalk stalk density of stacking through measuring and calculating nature is only 35 ~ 45kg/m
3), therefore, the maize straw adopting whole strain to gather in the crops stores and transport is a great problem, usually due to the existence of moisture, cost of transportation is increased, and in storage and transportation, cause a large amount of rotting, thus limits its application.The way of both economical practicality is harvesting limit, limit silk, and the stalk quality after silk becomes soft in small, broken bits, and natural resiliency reduces greatly.Adopt hydraulic pressure packaging technique, by the straw compression packing after silk, form the square bale of high density, profile rule.Be conducive to storage and the transport of stalk, can substitute feed grass as the grain ration of surviving the winter of cattle and sheep, also can long distance transportation as the raw material of industry.
Maize straw rubs a technology, bundling technology is a kind of novel straw processing method that developed recently gets up, " maize straw rubs the development of silk, bundling outfit " (Xinjiang agricultural machanization, the 2nd phase in 2008) discloses a kind of maize straw and rubs silk, bundling outfit; " the careless technology of silk system is rubbed in maize straw mechanization " (science and technology of the farm machinery is promoted, 2004.11) a kind of maize straw rubbing technology is proposed, becoming the horizontal guillotine cutting of traditional maize straw into longitudinal wire squeeze rubs, maize straw rubbing is become soft thread forage grass, maize straw, after wire squeeze rubbing, destroys stalk epidermal structure, makes forage grass soft, good palatability, can improve grazing rate.
But above-mentioned technology is only limitted to be used for forage grass by after maize straw wire squeeze, greatly limit its range of application.And due to adopt above-mentioned rub a thread technology time flesh is not removed, process fleshes whole containing maize straw in the corn stalk skin of the filament obtained, and owing to containing a certain amount of xylan class hemicellulose in flesh, this kind of hemicellulose is under the effect of illumination and oxygen, be easy to oxidized generation carbonyl chromophore and carboxyl auxochrome, when for serious brightness reversion phenomenon can be caused during papermaking; And due to the effect of flesh self fragility, the existence of a large amount of flesh makes the tear index of paper have decline to a certain degree.
Like this, how the skin of maize straw, flesh are separated on a large scale with leaf, improve serviceability, to provide a kind of corn stalk raw material of performance improvement, widen its Application Areas, improve value, just become the key link of corn stalk raw material comprehensive utilization.
Adopt in prior art when rubbing a thread technology and flesh is not removed, process fleshes whole containing maize straw in the corn stalk skin of the filament obtained, and owing to containing a certain amount of xylan class hemicellulose in flesh, this kind of hemicellulose is under the effect of illumination and oxygen, be easy to oxidized generation carbonyl chromophore and carboxyl auxochrome, when for serious brightness reversion phenomenon can be caused during papermaking; And due to the effect of flesh self fragility, the existence of a large amount of flesh makes the tear index of paper have decline to a certain degree.Eliminate a part of flesh in the present invention, prove that the existence of a small amount of flesh can improve the performance of paper through test.
In the present invention, described suitcase draws together straw skin and the maize straw skin silk of strip.
In 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%.
In the present invention, the straw skin silk one by one after described straw skin silk comprises the separation of skin flesh and the straw skin tow be incorporated on skin; The length of the straw skin of described strip is not more than 45cm.
In 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 being incorporated into the partial continuous on skin.
In the present invention, along slight crack stalk longitudinal direction having the straw skin silk forming partial continuous on described skin.
In the present invention, described flesh comprise on the free flesh and skin that depart from outside skin remaining not by peel off in conjunction with flesh.
In the present invention, the content of described free flesh is 2.5 ~ 4.5wt%, and the described content in conjunction with flesh is 0.5 ~ 2.5wt%.
In the present invention, described free flesh is graininess or bulk.
Paper grade (stock) corn stalk 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 through extruding, grind and rub, tear, blend or rub that the mechanical means of silk obtain with the hands; Be preferably after agricultural harvester harvesting, skin flesh leaf are separated, when being 15 ~ 45% to moisture, collection obtains; More preferably after agricultural harvester harvesting, skin flesh leaf are separated, airing or air-dryly collect that bundling obtains when being 15 ~ 45% to moisture in the fields.
Due to extruding, grind and rub with the hands, tear, blend or rub in the mechanical processes such as silk, a part of flesh and/or leaf become very little chip, broken end.Other components described in the present invention are these chip, broken ends etc., and it cannot distinguish flesh or leaf.
It is crucial for realizing above-mentioned technical process reasonable selection corollary equipment, the equipment processing agricultural crop straw at present is on the market a lot, but will note supporting science, reasonability when selecting, and makes the equipment of apolegamy play maximum efficiency, ensure the continuity of producing, reach optimum productivity index.Owing to being the crop stem in harvesting field, therefore will select can at the equipment of walking limit, limit, field work, with ensure equipment conveniently moving, flexibly, realize farm work.The present invention selects agricultural harvester, also can realize the separation of skin flesh leaf while harvesting.And supporting skin flesh leaf separator is installed on agricultural harvester, this device can adopt multiple mechanical type, and employing extruding, stone roller are rubbed with the hands, tear, blend, rubbed the multiple mechanical means such as silk, thus reach the technique effect be separated by the skin flesh leaf of maize straw.The present invention by process after stalk in field airing, by the impact of the factor such as air oxidation, Ultraviolet radiation, thus play the effect of sterilization, the corn stalk raw material prepared not easily is gone mouldy, extended shelf-life, and the oxidation Decomposition that sugar in stalk, Protein components can be accelerated, thus the content reducing impurity in fibrous raw material further, the cellulosic content of further raising, thus 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 by skin, flesh, the maize straw skin flesh leaf separator 3 that leaf is separated, maize straw under harvesting is transported to maize straw is torn, to blend and by skin, flesh, the defeated stem device 2 of the maize straw skin flesh leaf separator 3 that leaf is separated, between each structure or each structure directly use securing member to connect with chassis, ensure bonding strength, avoid occurring accident in the process of harvesting corn stalk.
Described maize straw skin flesh leaf separator 3 comprises for tearing, blend maize straw and the axial-flow type drum 11 of separating corn straw skin flesh leaf and the sieve 12 for the flesh after leaking down to be separated and leaf.
Described axial-flow type drum 11 is provided with multiple for tearing, blending maize straw and the tooth of separating corn straw skin flesh leaf.
Described tooth is one or more in screw-shaped bar tooth, spike tooth or dull and stereotyped tooth.
Described sieve 12 is provided with multiple hole supplying the maize straw flesh of separation and leaf to pass through.
The described receipts stem ceding of Taiwan 1 is provided with cutter A, described cutter A downward-sloping certain angle in the horizontal direction, can avoid so again being cut by cutter when also not entered harvester by the maize straw that cutter A cuts off, make one section of stalk drop to ground and can not enter harvester and blend.
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 the side of harvester, the trailing wheel of harvester can be avoided like this to roll and be scattering into straw skin on the ground, better to store up.Due to harvesting time maize straw moisture higher, the flesh after separation and leaf are all very moist, through sift out 12 hole after be easy to occur alluvial blocking, had anti-block apparatus 7 that the flesh of separator well and leaf can be allowed to 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 skin, flesh, being separated of leaf, the rotating speed of axial-flow type drum d is very crucial, and in the present invention, the rotating speed of described axial-flow type drum 11 is 900 ~ 1000r/min, preferably 950 ~ 1000r/min.
Obtain good separating effect, according to crop situation, the gap regulated between axial-flow type drum 11 and sieve 12 is very important, there is fourth gear gap for this reason, i.e. 5mm, 10mm, 15mm, 20mm, when crop is moist, with small―gap suture between axial-flow type drum 11 and sieve 12, when crop is dry, between cylinder and sieve, use wide arc gap.
Compared with prior art, tool of the present invention has the following advantages:
(1) maize straw (whole bar) can not be purchased in enormous quantities, cannot realize large-scale industry and utilize; Paper grade (stock) corn stalk raw material of the present invention can be purchased in enormous quantities, can realize heavy industrialization and utilize, can be widely used in field of papermaking;
(2) maize straw (whole bar) transport, bearing capacity is low, and the corn stalk raw material transport of bundle shape of the present invention, bearing capacity are high, the vehicle of equal transport power, and each car is only freighted 13 tons of maize straws (whole bar); The corn stalk 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 deposit 350 kilograms/square metre, and the corn stalk raw material of bundle shape of the present invention can deposit 1 ton/square metre;
(4) peasant is by after harvest corn, goes back field (rotary tillage), expense: 150 yuan/mu by after corn straw smashing; Reclaimed by industrialization straw harvesting, separation, packing, soil rotary tillage obtains the corn stalk raw material of bundle shape of the present invention, adds up to expense: 100 yuan/mu.
Summary of the invention
For solving the problem, the object of the present invention is to provide a kind of paper grade (stock) corn stalk raw material, the problem storing and transport can not only be solved well, and can field of papermaking be widely used in, improve serviceability, widened Application Areas, improve value, can be purchased in large quantity, realize heavy industrialization and utilize.
For achieving the above object, the present invention adopts following technical scheme:
A kind of paper grade (stock) corn stalk raw material, wherein, described paper grade (stock) corn stalk raw material takes from the maize straw of corn maturity period results; The moisture of the corn stalk raw material of described bundle shape is 15 ~ 45%; The corn stalk raw material of described bundle shape at least comprises the skin of separation, flesh and leaf, 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.
Accompanying drawing explanation
Fig. 1 is the structure chart of agricultural harvester of the present invention;
Fig. 2 is maize straw conveying schematic diagram in the present invention; ;
Fig. 3 is straw skin dispersal device and anti-block apparatus installation site schematic diagram in corn picker of the present invention;
Wherein:
1---receive the stem ceding of Taiwan, 2---defeated stem device, 3 meters of straw skin flesh leaf separators, 4---chassis, 5---driver's cabin, 6---straw skin dispersal device, 7---anti-block apparatus, 8---receive stem cutting table auger, 9---chain harrow assembly, 10---cut flow roller, 11---axial-flow type drum, 12---sieve, 13---oscillating screen plate, 14---distribute screw feeder, 15---fan.
Detailed description of the invention
Be below the specific embodiment of the present invention, described embodiment is to further describe the present invention, instead of restriction the present invention.
Embodiment 1
A kind of moisture of paper grade (stock) corn stalk raw material is 15%; Described paper grade (stock) corn stalk raw material at least comprises the skin of separation, flesh and leaf, 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) corn stalk raw material adopts following process route to obtain:
After the maize straw gathered in the crops in the corn maturity period carries out gathering in through agricultural harvester of the present invention (as depicted in figs. 1 and 2), skin flesh leaf is separated, when airing to moisture is 15% in the fields, bundling obtains.
See Fig. 1 and Fig. 2, the agricultural harvester that the 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 by skin, flesh, the maize straw skin flesh leaf separator 3 that leaf is separated, maize straw under harvesting is transported to maize straw is torn, to blend and by skin, flesh, the defeated stem device 2 of the maize straw skin flesh leaf separator 3 that leaf is separated, between each structure or each structure directly use securing member to connect with chassis, ensure bonding strength, avoid occurring accident in the process of harvesting corn stalk.
Described maize straw skin flesh leaf separator 3 comprises for tearing, blend maize straw and the axial-flow type drum 11 of separating corn straw skin flesh leaf and the sieve 12 for the flesh after leaking down to be separated and leaf.
Described axial-flow type drum 11 is provided with multiple for tearing, blending maize straw and the tooth of separating corn straw skin flesh leaf.
Described tooth is one or more in screw-shaped bar tooth, spike tooth or dull and stereotyped tooth.
Described sieve 12 is provided with multiple hole supplying the maize straw flesh of separation and leaf to pass through.
The described receipts stem ceding of Taiwan 1 is provided with cutter A, described cutter A downward-sloping certain angle in the horizontal direction, can avoid so again being cut by cutter when also not entered harvester by the maize straw that cutter A cuts off, make one section of stalk drop to ground and can not enter harvester and blend.
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 skin, flesh, being separated of leaf, the rotating speed of axial-flow type drum d is very crucial, and in the present embodiment, the rotating speed of described axial-flow type drum 11 is 950r/min.
Obtain good separating effect, according to crop situation, the gap regulated between axial-flow type drum and sieve is very important, there is fourth gear gap for this reason, i.e. 5mm, 10mm, 15mm, 20mm, when crop is moist, with small―gap suture between axial-flow type drum and sieve, when crop is dry, between cylinder and sieve, use wide arc gap.Operation process is: grow the maize straw in farmland, after 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, the stalk cut off is delivered to cut flow roller 10 by the chain harrow assembly 9 in defeated stem device 2 by stalk, 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 maize straw is to be torn the degree that is torn in process 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 maize straw skin silk.And in maize straw skin silk, what have is combined with skin graft, what have is not combined with skin graft; In conjunction with skin silk at least stalk tubercle part combine formed tow, the filament shape skin silk then formed one by one be not combined with skin graft.The slight crack of high-visible formation straw skin silk on skin graft.Meanwhile, because the degree that is torn is different, the flesh part on maize straw skin is stripped formation and departs from free flesh in skin graft, and part be not stripped formation be attached on skin graft in conjunction with flesh.Irregular block flesh and scutellate blade fall by sieve 12 being arranged the hole that the maize straw flesh that Gong is separated and leaf pass through, the shake sieve plate 13 at harvester rear is delivered to by distribution screw feeder 14, flesh and blade lean on the shake of fan 15 and shake sieve plate 13 to act on agricultural harvester rear and discharge, the stalk crust of strip breaks up rear discharge by straw skin dispersal device 6, fulfils assignment.
By stalk crust airing in farmland of irregular block flesh, scutellate blade and strip, in airing process, irregular block flesh part becomes graininess, and scutellate blade also part becomes chip; Bundling collection is carried out when sampling detection 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 the described content in conjunction with flesh is 0.5wt%.
Embodiment 2
A kind of moisture of paper grade (stock) corn stalk raw material is 45%; Described paper grade (stock) corn stalk raw material at least comprises the skin of separation, flesh and leaf, 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) corn stalk raw material adopts following process route to obtain:
After the maize straw gathered in the crops in the corn maturity period carries out gathering in through agricultural harvester of the present invention (as depicted in figs. 1 and 2), skin flesh leaf is separated, in the fields air-dry when being 45% to moisture bundling obtain.
The agricultural harvester that the present embodiment uses has set up straw skin dispersal device 6 and anti-block apparatus 7 further on the basis of embodiment 1, and see 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.Irregular arrangement can be presented when being discharged on the ground by the stalk crust of the isolated strip of maize straw skin flesh leaf separator 3, rolling of rear wheel for harvester may be subject to, simultaneously because straw skin is comparatively hard and fiber connectivity is good, phenomenon in heaps may be there is, be not easy to airing.Therefore installing straw skin dispersal device 6 additional, this device to be made the blade rotation in it by V belt translation mode by cylinder, broken up by straw skin and have the guiding of device case that straw skin is broken up the ground of harvester side uniformly, and being convenient to airing and bundling.
Described anti-block apparatus 7 is located at the bottom of sieve 12.If harvesting maize straw leaf and flesh is moister, moisture is high, then the irregular block flesh that produces under the effect of axial-flow type drum and sieve of stalk and scutellate blade are after the sieve that leaks down, may adhere on the inwall of harvester, along with its continuous accumulation can make sieve hole plug, the separating effect of stalk is caused to weaken.So install this anti-block apparatus additional, by distribution screw feeder as main transmission, drive anti-block apparatus by the mode of chain gear transmission, under anti-block apparatus constantly acts on, make to stick to flesh on inwall and leaf and enter smoothly and distribute in screw feeder, complete 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 the 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) corn stalk raw material is 30%; Described paper grade (stock) corn stalk raw material at least comprises the skin of separation, flesh and leaf, 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) corn stalk raw material adopts following process route to obtain:
After the maize straw gathered in the crops in the corn maturity period carries out gathering in through agricultural harvester of the present invention (as depicted in figs. 1 and 2), skin flesh leaf is separated, in the fields air-dry when being 30% to moisture bundling obtain.
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 the 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.
Embodiment 4
A kind of moisture of paper grade (stock) corn stalk raw material is 20%; Described paper grade (stock) corn stalk raw material at least comprises the skin of separation, flesh and leaf, 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) corn stalk raw material adopts following process route to obtain:
After the maize straw gathered in the crops in the corn maturity period carries out gathering in through agricultural harvester of the present invention (as depicted in figs. 1 and 2), skin flesh leaf is separated, when airing to moisture is 20% in the fields, bundling obtains.
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 the 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
Corn stalk raw material stores up experiment
Corn stalk raw material prepared by the paper grade (stock) corn stalk raw material adopting experimental example 1 of the present invention to prepare and prior art carries out storing up comparative test at identical conditions:
Divide 3 batches by corn stalk raw material prepared by embodiment 1, 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 prepared, stores with warehouse that is clean, that close, the temperature in warehouse is set as 40 DEG C, and relative humidity is place 15 days at 40 temperature, in sampling in the 5th day, the 10th day, the 15th day, detects whether going bad of stalk sample.The results are shown in Table 3
Table 3
2. super-humid conditions experiment
The above-mentioned stalk prepared, store with warehouse that is clean, that close, the temperature in warehouse is set as 25 ± 2 DEG C, places 15 days under the condition of relative humidity 90 ± 5%, in sampling in the 5th day, the 10th day, the 15th day, detect whether going bad of stalk sample.The results are shown in Table 4:
Table: 4
3. hot and humid condition experiment
The above-mentioned stalk prepared, stores with warehouse that is clean, that close, the temperature in warehouse is set as 35 ± 2 DEG C, place 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 whether going bad of stalk sample.The results are shown in Table 5:
Table 5
Test example 2
Copy paper contrast test
1, slurrying
The maize straw skin (being called for short contrast 2) of the maize straw skin (abbreviation contrast 1) of the paper grade (stock) corn stalk raw material (being called for short test) of the embodiment of the present invention 1, " maize straw skin flesh is separated and pulp-making test " and the sarconeme shape structure of " design of corn combine stalks rubbing baler for bank and emulation " is adopted caustic soda-anthraquinone method pulping way, carry out in 15L revolving digester, heating-up time counts from 25 DEG C, 100 DEG C of little steam bleedings, alkali charge 16%(is with Na
2o counts), liquor ratio 1:5, maximum temperature 160 DEG C, heating-up time 90min, temperature retention time 60min, anthraquinone consumption 0.05%.
2, bleach
This test adopts traditional CEH tri-stage bleaching mode to bleach the corn stalk latex that above-mentioned raw materials obtains.---washing---alkali treatment (E)---washing---hypochlorite bleaching (H)---washing that technological process is: chlorination (C).Totally applied chlorine is 8%, and other technological parameters are in table 6.
Table 6, corn stalk latex bleaching process parameter
3, handsheet
The automatic handsheet machine of corn stalk latex PTI obtained by above-mentioned raw materials carries out handsheet experiment, is quantitatively 60g/m
2, quantitatively fluctuation is for ± 3.5%.
Measure whiteness, opacity, YI yellow index and pattern physical strength by related standards method, measure in table 7.
Table 7, corn stalk skin bleached pulp performance test results
Compared with contrast 1, the opacity obtained by paper grade (stock) corn stalk raw material of the present invention has certain decline, and paper YI yellow index improves, but tensile index, burst index, tear index and folding strength are improved; Contrast 2 then because flesh is not removed, in raw material, make the tensile index of paper, burst index and tear index not as good as the present invention containing a large amount of fleshes, may due to the effect of flesh self fragility, and brightness reversion phenomenon is more serious.Therefore, the Papermaking Performance of paper grade (stock) corn stalk raw material of the present invention is better than contrast 1 and contrast 2.
Also carried out above-mentioned test to the paper grade (stock) corn stalk raw material of other embodiments of the invention gained, its result obtained is similar.
Claims (10)
1. a paper grade (stock) corn stalk raw material, is characterized in that, described paper grade (stock) corn stalk raw material takes from the maize straw of corn maturity period results; The moisture of described paper grade (stock) corn stalk raw material is 15 ~ 45%; Described paper grade (stock) corn stalk raw material at least comprises the skin of separation, flesh and leaf, 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; Described flesh comprise on the free flesh and skin that depart from outside skin remaining not by peel off in conjunction with flesh, the content of described free flesh is 2.5 ~ 4.5wt%, and the described content in conjunction with flesh is 0.5 ~ 2.5wt%.
2. paper grade (stock) corn stalk raw material according to claim 1, is characterized in that, described suitcase draws together straw skin and the maize straw skin silk of strip.
3. paper grade (stock) corn stalk 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) corn stalk raw material according to claim 3, is characterized in that, the straw skin silk one by one after described straw skin silk comprises the separation of skin flesh and the straw skin tow be incorporated on skin; The length of the straw skin of described strip is not more than 45cm.
5. paper grade (stock) corn stalk 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 being incorporated into the partial continuous on skin.
6. paper grade (stock) corn stalk raw material according to claim 5, is characterized in that, along slight crack stalk longitudinal direction having the straw skin silk forming partial continuous on described skin.
7. paper grade (stock) corn stalk raw material according to claim 6, is characterized in that, described free flesh is graininess or bulk.
8. the paper grade (stock) corn stalk raw material according to claim 1-7 any one, it is characterized in that, described paper grade (stock) corn stalk raw material is that the maize straw gathered in the crops in the corn maturity period obtains through extruding, grinding the mechanical means of rubbing, tear, blend or rubbing silk with the hands.
9. paper grade (stock) corn stalk raw material according to claim 8, is characterized in that, described paper grade (stock) corn stalk raw material is after agricultural harvester harvesting, skin flesh leaf are separated, and when being 15 ~ 45% to moisture, collection obtains.
10. paper grade (stock) corn stalk raw material according to claim 9, it is characterized in that, described paper grade (stock) corn stalk raw material is after agricultural harvester harvesting, skin flesh leaf are separated, in the fields airing or air-dryly collect that bundling obtains when being 15 ~ 45% to moisture.
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