KR101057647B1 - Pretreatment device for removing pith from corn-stalk - Google Patents

Abstract

PURPOSE: A cornstalk pretreatment apparatus is provided to mix conifer bleaching chemical pulp, broad leafed tree bleaching chemical pulp, and bleaching chemical heater pulp. CONSTITUTION: A cornstalk pretreatment apparatus comprises: a casing, shaft, and cover member. The casing(100) inputs cornstalks from the upper side and discharges to the lower side. The shaft is rotated by outer force by insertion into the casing. The cover member is connected to entire or partial upper part of the casing. A rotator hits the cornstalk in a chip state.

Description

Corn Stalk Pretreatment Unit {PRETREATMENT DEVICE FOR REMOVING PITH FROM CORN-STALK}

The present invention relates to a pretreatment device for cornstalk chips, and more particularly, to a pretreatment device for removing cornstalk genus and shell separation.

In general, paper has been known to be produced from wood pulp as the main raw material. Although in countries with relatively scarce timber resources, pulp has been produced using herbs such as straw, bagasse and reed for a long time, the quality of pulp is very high because it is at the level of small domestic industry. Inferior, poor dehydration is also a lot of difficulties in the paper manufacturing process. This reality gave the prejudice that high-quality paper must be made of wood pulp. However, as civilization rapidly develops and urbanization progresses, environmental damage is intensified, and serious problems that threaten human survival such as ecosystem change and rapid climate change are caused by side effects such as ozone layer destruction and climate warming.

Such changes in the environment have forced major developed countries with high carbon emissions to participate in climate change agreements, and even a market has already been established to trade carbon credits. Is working hard.

Indonesia, which has been known as a major producer of wood, has been depleted of wood resources for a long time because of depletion of timber resources, and it is suppressing logging in Brazil, which is the lung of the earth. This change is not only raising the price of wood pulp but also a war of securing pulp for paper manufacturing. This global trend has attracted interest in securing fiber resources with relatively short growth cycles.

As a representative example, there have been attempts to resource pulp through cultivation of kenaf, which is relatively fast growing, and attempts to use it as a pulp material by cultivating fast-growing tropical hardwoods. Despite these efforts, however, no fundamental solution has yet been found. Therefore, interest in pulp resources of herbaceous and agricultural waste, which can be reproduced annually, has become a concern.

Herbs, in particular, have very different morphological and chemical properties from wood. Although bast fibers and some herbs are longer than woodpulp fibers, most herbs contain thin or short flow cells compared to woodpulp. Therefore, when it is used as a raw material for paper manufacturing, it is difficult to be practically used due to poor dehydration and low strength properties, and has only been used as a raw material for low-grade paper production in underdeveloped countries or in countries with insufficient wood resources. Although their chemical properties are similar to conifers, they tend to have low lignin content and high hemicelluloses content.

Corn cobs, on the other hand, are the second largest agricultural waste generated after rice straw. They are thrown away because they have no special use except some are used as feed. Thus, attempts to make pulp resources of corn stalks can greatly help not only environmental protection but also increase farm income through the recycling of waste fiber.

In particular, the fiber length of cornfield is slightly longer than that of hardwoods, and it is expected to be difficult to secure the bulk of the paper due to its thin characteristics, but it is very low in lignin and high in hemicellulose, and suitable for papermaking. It has chemical properties.

The genus of cornstalks is composed of very fine flow cells and contains a large amount of silica, which can cause many problems when used as a paper pulp without separating the genus parts. The fact that the technology for separating such parts is not developed is one of the reasons that corn cob has not been widely used as a raw material for papermaking. In particular, when there are many flow cells with very small fiber sizes, dewatering is not good, and thus the production speed cannot be increased during paper manufacturing, and a lot of web breaks occur. For this reason, even in China, where corn cobs are mass-produced, they are only partially used for the production of low grade packaging paper.

Conventional corn cob removal equipment has a very complex step of splitting the corn cobs long, arranging them in a certain direction, then squeezing them to widen them and scraping the inner parts from them, resulting in at least tens of thousands to hundreds of thousands of tons of corn per day. The productivity is too low and the processing capacity is too low for the pulp mill that needs to supply large chips. Therefore, there is a need for improvement.

The present invention has been made to solve the above problems, the most important technology in mass production of high quality corn bar pulp not only worsens the yield and quality of the pulp, but also increases the drug consumption and contains a large amount of silica. It is a part that separates the pith part, which causes difficulty in recovering the chemical solution. By providing information on the device and technology for separating the genus, which is the core of mass production of pulp from corn stalks, It is an object of the present invention to provide a pretreatment apparatus for the removal of the inside of the corn cob and the separation of the shell to economically produce high quality pulp.

In addition, the present invention is to maximize the advantages of corn pulp pulp and improve the bulk (bulk) disadvantages to provide a paper manufacturing method having a variety of characteristics, such as industrial packaging paper, toilet paper and thin paper, printing paper (printing paper) It is an object of the present invention to provide a pretreatment device for removing the inner core and separating the shell.

The pretreatment apparatus for removing the inside of the cornstalk and separating the shell according to the present invention includes: a casing for injecting cornstalk into the upper side in a free-falling manner to induce discharge to the lower side, and a cornstalk inserted into the casing to be rotated and introduced into the cornstalk. And a rotating body hitting a chip state, wherein the rotating body is axially inserted into the casing and rotated by an external force, and is rotatably inserted and fixed to the shaft and connected to all or a part of an open upper side of the casing. A cover member, and a blow portion formed on the circumferential surface of the shaft to strike the cornstalks introduced into the casing.

The striking part includes a plurality of plates formed along an axial direction of the shaft, and a plurality of bars formed along edges of the plates.

In addition, the striking portion includes a striking rib formed to be detachably formed on the bar and striking the striking cornstalk.

The bar or the striking rib preferably forms a curved portion.

The shaft is preferably connected to the gearbox is capable of adjusting the rotational speed.

The casing is preferably to form a baffle on the inner side to improve the striking force of the cornstalk.

The casing is preferably formed with an inlet on the upper side or circumferential surface to receive the cornstalk, and the cornstalk introduced into the inlet is continuously supplied by the crawler feeder.

The casing is preferably provided with a vibrating screen to separate the cornstalks falling hit by size.

The vibrating screen unit, a frame provided on the lower side of the casing and formed to discharge the cornstalks falling down, a plurality of laminated so as to be inclined inside the frame and mesh screen screening the larger cornstalks from the bottom toward the upper side It comprises a mesh screen group consisting of, discharge hole through the circumferential surface of the frame for discharging cornstalks filtered by each of the mesh screen, and a vibrating portion for imparting vibration to the frame.

The cornstalks separated by size and filtered are preferably re-introduced into the casing by a feedback feeder.

Method for producing pulp using a pretreatment apparatus for removing the genus and shell separation of cornstalk according to the present invention comprises the steps of: cutting the length of cornstalk to 10 ~ 60 mm, striking the cut cornstalk using a rotary blower, and A cornstalk pretreatment step to filter out the crumbs of the cornstalk hull, genus and hull.

Cooking the cornstalk chips obtained by the cornstalk pretreatment step using caustic soda and sodium carbonate.

The cooking step is preferably carried out within the active alkali concentration of 12 to 16%, the liquid ratio of 3: 1 to 6: 1, the temperature of 120 to 150 ℃ and the time range of 60 to 150 minutes.

In the cooking step, anthraquinone is added in an amount of 0.05 to 0.2% in order to minimize decomposition of hemicellulose and to increase pulp yield.

In addition, according to the present invention, it is possible to provide a method for producing industrial paper by blending 100% unbleached cornstalk pulp or unbleached conifer bleached kraft pulp or unbleached hardwood kraft pulp prepared by the above-described method.

In addition, according to the present invention, a method for manufacturing toilet paper and thin paper with bleached cornstalk pulp prepared by the above-described method can be presented.

In addition, according to the present invention, there is proposed a method for producing printing paper by mechanically treating bleached cornstalk pulp and mixing one or more pulp of conifer bleaching chemical pulp, hardwood bleaching chemical pulp, and bleaching chemical thermothermal pulp. Can be.

As described above, the pretreatment apparatus for removing the genus and shell of the cornstalk according to the present invention, unlike the prior art, by securing a pre-treatment and chip manufacturing technology that can produce high-quality pulp from cornstalks, agricultural waste As compared with the present invention, it is possible to produce high quality pulp under very mild conditions.

In addition, the present invention is used as a raw material for the production of industrial paper in the state of unbleached pulp, or a coniferous chemical bleaching pulp, hardwood bleaching chemical pulp, bleaching chemical thermomechanical pulp, etc., having various characteristics, as appropriately blended with bleached cornstalk pulp In addition to providing paper, high-quality paper production technology that can be used as printing paper can contribute greatly to increasing farm incomes and protecting the environment.

1 is a block diagram of the entire pretreatment apparatus for removing the inside and separating the shell of the cornstalk chip pretreatment apparatus according to an embodiment of the present invention.
Figure 2 is a cross-sectional view showing a rotating body of the pretreatment apparatus for removing the genus corn husk and shell separation according to an embodiment of the present invention.
3 is a state diagram in which the rotor is disassembled from the casing of the pretreatment apparatus for removing the cork and separating the shell according to an embodiment of the present invention.
Figure 4 is a perspective view of a rotating body of the pretreatment apparatus for removing the genus corn husk and shell separation according to an embodiment of the present invention.
Figure 5 is an exploded perspective view of the striking portion of the pretreatment apparatus for removing the genus corn husk and shell separation according to another embodiment of the present invention.
Figure 6 is a plan view of a mesh screen provided with a plurality of pre-treatment apparatus for the removal of the genus corn husk and shell separation according to an embodiment of the present invention.
Figure 7 is a flow chart showing a pre-treatment apparatus for removing the genus corn husk and separating the shell according to an embodiment of the present invention, pulp manufacturing method using the same.
8 is a photograph showing a cornstalk cut to a length of 1.5 cm, 3 cm, 6 cm and 10 cm using a cornstalk chip pretreatment apparatus according to an embodiment of the present invention.
Figure 9 is a photograph showing the state of raw cornstalk and dry cornstalk chips treated with a striking device for separating the inside and the shell according to an embodiment of the present invention.
10 is a flowchart of chip preparation and skin separation using a cornstalk chip pretreatment apparatus according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the pretreatment apparatus for removing the genus corn husk and shell separation according to the present invention, a pulp manufacturing method using the same and a paper manufacturing method using the same. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a block diagram of a cornstalk chip pretreatment apparatus according to an embodiment of the present invention, Figure 2 is a cross-sectional view showing a rotating body of the cornstalk chip pretreatment apparatus according to an embodiment of the present invention, Figure 3 4 is a state diagram in which a rotating body is disassembled from a casing of a cornstalk chip pretreatment apparatus according to an embodiment of the present invention, and FIG. 4 is a perspective view of a rotating body of the cornstalk chip pretreatment apparatus according to an embodiment of the present invention.

Figure 5 is an exploded perspective view of the hitting portion of the cornstalk chip pretreatment apparatus according to another embodiment of the present invention.

6 is a plan view of a mesh screen provided with a plurality of cornstalk chip pretreatment apparatus according to an embodiment of the present invention.

7 is a flowchart showing a cornstalk chip pretreatment method according to an embodiment of the present invention, Figure 8 is a length of 1.5 cm, 3 cm, 6 using the cornstalk chip pretreatment apparatus according to an embodiment of the present invention, respectively. It is a photograph showing a cornstalk cut into cm and 10 cm, Figure 9 is a photograph showing the state of raw cornstalks and dry cornstalk chips using a cornstalk chip pretreatment apparatus according to an embodiment of the present invention.

10 is a flowchart of chip preparation and skin separation using a cornstalk chip pretreatment apparatus according to an embodiment of the present invention.

1 to 4, the pretreatment apparatus for removing the cork and separating the hull according to an embodiment of the present invention includes a casing 100 and a rotating body 200.

The casing 100 serves to induce discharge to the lower side by inputting the cornstalk to the upper side in a free-falling manner. The casing 100 may be variously modified, but is illustrated in a cylindrical shape for convenience. In addition, the casing 100 is applicable to a variety of materials.

In particular, the casing 100 is formed so as to freely drop the cornstalk. This is to continuously supply the cornstalks and to immediately discharge the chips hit from the cornstalks so as not to accumulate inside the casing 100.

The rotor 200 is axially inserted into the casing 100. The rotor 200 is rotatably mounted inside the casing 100. Thus, the cornstalk is supplied to the upper side of the casing 100 and then hit inside the casing 100 to be discharged downward in a chip state.

In particular, the rotor 200 includes a shaft 210, a cover member 220 and the striking portion 230.

The shaft 210 is axially inserted into the casing 100. That is, the shaft 210 is mounted to stand vertically in the casing 100. Then, the shaft 210 is rotated in one direction by the drive motor 212. The driving force of the driving motor 212 is transmitted to the shaft 210 as a rotating force can be applied in various ways.

In addition, the cover member 220 is fixed to the shaft 210 position, and serves to prevent the cornstalk to fly to the upper side of the casing 100 while hitting the rotating body (200).

That is, the cover member 220 is detachably formed on the upper side of the casing 100 and rotatably mounts the shaft 210 in the center. Although not shown, the shaft 210 is preferably provided with a ball bearing so as not to generate friction with the cover member 220 during rotation.

In particular, the cover member 220 is formed to cover the whole or part of the open upper side of the casing (100).

At this time, when the cover member 220 blocks the entire upper side of the casing 100, the casing 100 is supplied with a cornstalk by separately forming the inlet 110 in the upper circumferential surface. Here, the inlet 110 is formed above the circumferential surface of the casing 100, in order to increase the time that the cornstalks supplied into the casing 100 is blown in the casing 100 to the maximum blow.

In addition, when the cover member 220 blocks a part of the open upper side of the casing 100, the part of the open upper side of the casing 100 itself serves as the inlet 110. Of course, the cover member 220 may be deformed into various shapes, and detachably coupled to the upper side of the casing 100 by various methods such as bolting. In addition, the cover member 220 may be detachably formed on the lower side of the casing 100, but is preferably formed on the upper side of the casing 100 for smooth discharge of the cornstalk in the chip state.

In addition, the striking portion 230 is formed on the circumferential surface of the shaft 210 serves to hit by hitting the cornstalks directly introduced into the inlet 110 of the casing 100. The hitting unit 230 is preferably fixed to the shaft 210 to maximize the hitting force applied to the cornstalk by the rotation of the shaft.

In particular, the striking portion 230 includes a plate 232 and a bar 234.

The plate 232 is formed in plural on the circumferential surface of the shaft 210. In this case, a plurality of plates 232 are formed along the axial direction of the shaft 210, and may be deformed into various shapes and various materials.

In addition, the plate 232 is fixedly coupled to the shaft 210 by various methods such as clamping. Of course, the plate 232 may be integrally formed on the shaft 210. The number of plates 232 is not limited.

In addition, a plurality of bars 234 are formed along the edge of each plate 232. The bars 234 are provided in pairs to serve to hit the cornstalks. In particular, the bars 234 are made of a pair of different lengths, staggered ones of different lengths. This is to improve the striking force of the cornstalk. Bar 234 is preferably formed detachably to plate 232.

At this time, the bar 234 forms the curved portion 238. The curved portion 238 is formed as a curved surface on the circumferential surface of the bar 234 in direct contact with the cornstalk, and serves to separate the shell and the endothelial by hitting the cornstalks. Since the bar 234 forms the curved portion 238, the bar 234 can be separated into the outer skin and the inner skin without grinding the cornstalk.

In addition, the shaft 210 is connected to the gearbox 214, the rotational speed is adjustable. This is to adjust the rotational speed of the shaft 210 in order to prevent the grinding of the bar 234 hitting the corn pole too hard. The gear box 214 connects the drive motor 212 and the shaft 210.

And, as in FIG. 5, in particular, the striking portion 230 includes a plate 232, a bar 234 and a striking rib 236.

A plurality of bars 234 are formed along the edge of each plate 232. The bar 234 serves to support the striking rib 236. In this case, the bar 234 may be integrally formed on each of the plates 232, or may be detachably formed. For convenience, the bar 234 is shown as bolted to the plate 232 to form a detachable. Of course, the number and shape of the bars 234 are not limited.

In addition, the hitting rib 236 is formed detachably on the bar 234 serves to hit by hitting the falling cornstalk. That is, the cornstalk hits the hitting rib 236 directly and is in a chip state. The striking rib 236 may be detachably formed on the bar 234 or may be integrally formed. For convenience, the striking rib 236 is detachably mounted to the bar 234 by bolting.

In particular, the striking rib 236 is preferably formed on the side facing the direction of rotation of the bar 234 so as to hit the cornstalk as possible. Of course, the blow rib 236 can be modified in a variety of shapes.

At this time, the reason why the hitting ribs 236 are separated from the bar 234 is to replace or maintain the hitting ribs 236, which are worn with prolonged use. Of course, the striking rib 236 may be the bar 234 itself.

The striking rib 236 forms the curved portion 238. The curved portion 238 is formed as a curved surface on the circumferential surface of the hitting rib 236 in direct contact with the cornstalk, and serves to separate the shell and the endothelial by hitting the cornstalks. Since the impact ribs 236 form the curved portion 238, the cornstalks can be separated into the outer skin and the inner skin without grinding the cornstalks.

In addition, the shaft 210 is connected to the gearbox 214, the rotational speed is adjustable. This is to adjust the rotational speed of the shaft 210 in order to prevent crushing due to the impact rib 236 hitting the cornfield too hard. The gear box 214 connects the drive motor 212 and the shaft 210.

On the other hand, since the shaft 210 and the striking portion 230 rotates, the inside of the casing 100 forms a vortex, whereby the cornstalk flowing into the casing 100 forms an inner wall of the casing 100. Will rotate accordingly. For this reason, the cornstalk does not directly contact the hitting rib 236, so that the hitting degree is reduced.

Thus, the casing 100 forms a baffle 300 on the inner side to improve the striking force of the cornstalk. The baffle 300 is vertically formed in the up and down direction of the casing 100 to strike the cornstalk flowing to the inner wall side of the casing 100 by the vortex to strike the chip state.

The baffle 300 may be integrally formed on the casing 100 or may be detachably formed on the casing 100. The baffle 300 may be modified in various shapes, and is not limited to the number.

On the other hand, the cornstalk is preferably continuously supplied to the inlet 110 automatically. This is to increase as much as possible the amount of blow corn corn within the set working time.

Thus, the cornstalk introduced into the inlet 110 is continuously supplied by the crawler feeder 400. Here, the crawler feeder 400 is configured to be continuously rotated so that the cornstalks can be continuously input. For example, the crawler feeder 400 may be configured as a conveyor belt wound around a pair of rollers to be forcibly rotated.

In addition, the cornstalk in the chip state hit by the hitting rib 236 while freely falling inside the casing 100 will vary in size. Thus, the cornstalks that are hit are preferably separated by size in the chip state.

Accordingly, the casing 100 is preferably provided with a vibrating screen unit 500 for separating the cornstalks falling hit by size.

Here, the vibration screen unit 500 includes a frame 510, a mesh screen group 520, a discharge hole 530, and a vibration unit 540.

Frame 510 is provided on the lower side of the casing 100, and is formed to discharge the cornstalks hitting and falling. For convenience, the frame 510 is shown in the shape of a cylinder that opens up and down.

The mesh screen group 520 is composed of a plurality of mesh screens 522 and 524 and is stacked inside the frame 510. In this case, each of the plurality of mesh screens 522 and 524 may be integrally formed inside the frame 510, but is preferably detachably mounted.

As shown in FIG. 6, each of the mesh screens 522 and 524 may be made of the same mesh, but preferably made of different meshes so as to sequentially separate cornstalks by size. For convenience, two mesh screens 522 and 524 are illustrated as being provided.

In more detail, mesh screens 522 and 524 are arranged to filter cornstalks with a larger mesh from bottom to top. That is, the mesh of the first mesh screen 522 disposed above is formed larger than the mesh of the second mesh screen 524 disposed below.

In addition, the cornstalk in the chip state filtered by the first mesh screen 522 and the cornstalk in the chip state filtered by the second mesh screen 524 may be discharged to a predetermined position.

Thus, the first mesh screen 522 and the second mesh screen 524 are disposed inclined with respect to the floor inside the frame 510. The first mesh screen 522 and the second mesh screen 524 are preferably arranged side by side.

In addition, the frame 510 passes through the discharge hole 530 on the circumferential surface to discharge the cornstalks filtered by the first mesh screen 522 and the second mesh screen 524. At this time, the discharge hole 530 is preferably formed in the frame 510 to correspond to the first mesh screen 522 and the second mesh screen 524, respectively.

Therefore, the cornstalks in the chip state filtered by the first mesh screen 522 and the second mesh screen 524 are discharged to the outside of the frame 510.

When the first mesh screen 522 and the second mesh screen 524 are vibrated, the corn chips in the filtered chip state are discharged through the discharge hole 530 to be smoothly discharged through the first mesh screen 522 and the second mesh screen. (524) will not be blocked.

Therefore, the frame 510 is provided with a vibrator 540 to cause the frame 510 to shake or to vibrate the first mesh screen 522 and the second mesh screen 524.

Here, the vibrator 540 connects the motor 542 and the eccentric shaft 544 to the power transmission member 546, and when the eccentric shaft 544 is rotated by the driving of the motor 542, the eccentric force is caused by the eccentric force. Let the frame 510 vibrate. The power transmission member 546 can be variously applied, such as a belt and pulley, a chain and a sprocket.

In particular, the cornstalk chip state below the set value passed through the second mesh screen 524 is preferably contained in the storage container 548. Storage bin 548 is preferably mounted on the lower side of the frame 510 to be detachable.

In addition, the cornstalk separated and filtered by the size discharged through the discharge hole 530 is preferably re-introduced into the casing 100 to be hit repeatedly.

Thus, the cornstalk separated and discharged through the discharge hole 530 is re-injected into the casing 100 by the feedback feeder 600.

The feedback feeder unit 600 is connected to the caterpillar feeder unit 400 and is configured to be continuously rotated to continuously feed cornstalks into the caterpillar feeder unit 400. For example, the feedback feeder unit 600 may be configured as a conveyor belt wound around a pair of rollers forcibly rotated.

Referring to Figure 7, the pulp manufacturing method using a pretreatment apparatus for removing the cork and the shell separation according to an embodiment of the present invention is a cutting step (S10), hitting step (S20), cornstalk pretreatment step (S30) And cooking step (S40).

Cutting step (S10) is the process of cutting the length of the corn to 10 ~ 60 mm.

When the cornstalks are cut to less than 10mm, cornstalks may be severely cut in fiber, and when the cornstalks are cut to a length exceeding 60mm, cornstalks have a problem in that the inside and the outside are not easily separated.

In addition, the striking step (S20) is a process of hitting the cut cornstalk using a rotary hammer. Here, the rotary hammer means the above-mentioned device.

In addition, the cornstalk pretreatment step (S30) is a process for filtering the debris of the outer shell, genus and shell of the cornstalk, the cooking step (S40) using the cornstalk chips obtained by the cornstalk pretreatment step using sodium hydroxide and sodium carbonate. It is a process of cooking.

At this time, the cooking step (S40) is preferably carried out within the active alkali concentration of 12 to 16%, the liquid ratio of 3: 1 to 6: 1, the temperature of 120 to 150 ℃ and the time range of 60 to 150 minutes.

In addition, in the cooking step (S40), it is preferable to add anthraquinone in an amount of 0.05 to 0.2% in order to minimize decomposition of hemicellulose and increase pulp yield.

In particular, the pretreatment method using a cornstalk according to an embodiment of the present invention provides a technique for producing a high-quality paper pulp using cornstalks, as a raw material for the production of industrial packaging, or to produce toilet paper and leaf paper after bleaching. . In addition, paper made of corn-stalk pulp by blending pulp with various characteristics such as softwood bleached chemical pulp, hardwood bleached chemical pulp, and bleach chemical thermomechanical pulp (BCTMP) with various characteristics. The present invention relates to a method for producing high quality printing paper by improving the quality problem of printing paper.

The most important in economically producing high quality pulp from cornstalks is to separate and remove relatively short fiber length parenchyma and high silica content. If this part is not removed sufficiently, the consumption of chemicals is not only increased, but the pulp yield is reduced, and the produced pulp contains a large amount of flow cells corresponding to fines. It becomes impossible to raise and raises the problem that the strength of paper falls. In addition, chemical additives introduced to give various functions to paper are selectively adsorbed by flow cells, resulting in inefficient additive efficiency.

It can be seen from Figure 8 that the cutting length is very important to efficiently remove the inner part from the cornstalk shell. When the force is applied from the outside, if the cut cornstalk is too long, it is difficult to separate and remove because the inner part does not come off well. Through this study, it was confirmed that the skin and the genus were easily separated when cutting cornstalks with 15mm-60mm length. 9 is a result obtained by hitting the wet cornstalk (wet cornstalk) and dry cornstalk (dry cornstalk) using the above-described device.

Based on the results of this study, a cornstalk chip preparation and shell separation system is proposed to produce high quality pulp as shown in FIG. 10.

The cornstalk chip preparation and shell separation system is to cut the cornstalk into 15mm-60mm to convert the chips into chips and then to separate the size of the cornstalks through the chip hitting process, the first mesh screen 522 and the second mesh screen 524 by size. Is done.

The chip cut to a length of 15mm-30mm is installed by a device for centrifugal blow that rotates the bar 234 shown in FIGS. 2 to 4 with each other and rotates at a high horsepower drive motor 212 at 500-3,000 rpm. After the treatment, the screen is screened from the first mesh screen 522 to 2-4 mesh screens. At this time, the coarse chip pieces caught on the first mesh screen 522 are sent to the casing 100 again, and those passing through the first mesh screen 522 are sorted again by the second mesh screen 524, where the second Part of the fines and the inner part passing through the mesh screen 524 is used as a boiler fuel or feed for livestock, and the part caught by the second mesh screen 524 is stored in a silo or sent directly to a digester (pulester). To prepare.

Cornwood, unlike wood, has a low lignin content and high hemicellulose content, as shown in Table 1, making it much easier to pulping. Although various pulping processes that can be used to produce wood pulp, such as the kraft process, the sulfite process and the soda-AQ process, are applied. Although soda, soda alone is sufficient to delignification. Therefore, the cooking chemical uses NaOH, and Na ₂ CO ₃ may be mixed if necessary. The dosage of the chemicals is converted to Na ₂ O, and 12-16% of active alkalis can be used to cook pulp under mild conditions to obtain better pulp. By applying such mild cooking conditions, the pre-treatment process using cellulose protection additives such as MgCl ₂ or MgCO ₃ can be omitted. Omitting this process can save on chemical and energy costs and shorten production time. In addition, to minimize the decomposition of hemicellulose and increase the pulp yield, anthraquinone may be added in an amount of 0.05-0.2%. The liquor ratio can be adjusted according to the characteristics of the pulp to be obtained in the range of 3: 1-6: 1. If the liquid ratio (liquor ratio) is too high, the concentration of the cooking chemicals may be lowered, which may cause a significant drop in chemical reaction. Cooking temperature is adjusted within the range of 120-150 ° C., and cooking time is adjusted according to the dosage of the applied chemical, temperature and the characteristics of the pulp to be prepared within the range of 60-150 minutes.

The cooked pulp is washed to remove residual chemicals, screened to remove less cooked cornstalk chips or larger contaminants, as in the manufacture of wood pulp, and to a cleaner. ) To remove foreign substances with a large specific gravity. The filtered portion of the screen is filtered once more with a vibrating screen so that the mass of less cooked and dissociated fibers is sent back to the digester.

After washing and debris removal, unbleached softwood kraft pulp or unbleached hardwood kraft pulp is used as raw material for industrial packaging or paperboard. At this time, a refining process is performed to obtain sufficient strength, and cornstalk pulp is very weak compared to wood pulp, so the beating is performed at a low intensity of 0.2-1.0 Ws / m. Through calcination, the freeness of the pulp is adjusted to a level of 500-350 ml CSF to produce industrial paper at the basis weight to be produced.

Corn cob pulp must be bleaching processes to be used as raw material for making toilet paper or fine paper. Corn cob has a low lignin content as shown in Table 1, so talignin is very easy. Therefore, unlike wood pulp, a sufficiently high brightness can be obtained by limiting the number of bleaching sequences to three stages. In addition, bleaching uses elemental chlorine free (ECF) or totally chlorine free (TCF) methods because of the risk of dioxin generation when elemental chlorine is used as bleaching agents. These bleaching methods are already applied to the bleaching of wood pulp. Usually, 5 bleaching is performed. However, considering that the bleaching of cornstalk pulp is easy, 3 bleaching is required when producing pulp with a brightness of 80-90%. Apply. Four-stage bleaching may be applied where particularly high brightness of more than 90% is required. As the ECF bleaching method, various bleaching groups such as DED, DEP, DEO, DEZ, PED, PEP, DEDP, DEOZ, DEDZ, DEOP, and DEPD may be applied. Where D is chlorine dioxide, E is alkaline extraction, P is peroxide, O is oxygen, and Z is ozone.

In the case of manufacturing fine paper or coating base paper, refining, pulp blending, sizing, and filler in order to give the necessary properties for each application. Stock preparation process such as loading is required. This process is the same when using all available pulp as well as wood pulp. It only optimizes the application of wood pulp formulation, fillers, sizing agents, retention aids, etc. to compensate for the shortcomings of cornfield pulp and to satisfy the characteristics of the paper to be produced. It is the key. Therefore, the present invention will be described based on the difference from the case using the existing wood pulp.

Corngrass pulp fiber has a very thin fiber compared to wood pulp as shown in Table 2. In addition, the high hemicellulose content, as shown in Table 1, when manufacturing the paper only bleached cornstalk pulp has a disadvantage that the density (density) is too high opacity (opacity) is lowered. For woodfree paper, it is easy to see that bulk and opacity need to be compensated for given the critical importance. Even in the case of manufacturing paper from wood pulp, coniferous pulp, hardwood pulp and a small amount of mechanical pulp are mixed and used to compensate for the disadvantages of each pulp.

Corn stalk pulp has good flexibility because of the thin fibers as described above, and because hemicellulose content is high, fiber bonding is better than other pulp fibers, so it does not confuse and passes through the deflake. It is possible to obtain strength sufficiently even by letting it. After the drying process in the papermaking process, a lot of energy is required in the beating process. In the case of wood pulp, the power required to lower the 100 ml CSF of Yeosu through beating is about 71 kW / t (softwood) to 84 kW / t (softwood) per ton of pulp. If we assume that 1,000 tons of pulp per day is converted to hardwood blasting energy, 71,000 kW of electric energy can be saved, and if it is operated 300 days a year, 21,300,000 kW of electric energy can be saved. The fact that corn coke pulp can be used as a raw material for papermaking can greatly reduce manufacturing costs by eliminating confession, especially given the growing pressures on reducing greenhouse gas emissions. It is expected to be.

When producing thin paper such as toilet paper, the basis weight is low, so no filler is used to secure the strength, especially when preparing toilet paper, absorbency, flushing properties and soft properties are very important. Corngrass pulp has a characteristic that is particularly suitable for making toilet paper, thin paper and glassine paper because the fiber length is somewhat longer, thinner and higher in hemicellulose content than hardwood. Corngrass pulp is much weaker than wood pulp, but has good binding properties, so it is sufficient to treat 2-3 times with only a deflaker without any confession to make toilet paper. In this case, the deflake refers to a device that gives only a weak impact to the pulp fibers. And beating refers to an operation in which fibrillation or cutting of fibers is caused by applying compressive, tensile and shear forces to the pulp fibers.

As a result of preparing toilet paper using 100% of cornstalk pulp, very good physical properties were obtained as shown in Table 3. When somewhat bulky structure and absorbency are required, such as toilet paper, 5-10% of softwood bleached kraft pulp, 20-40% of hardwood bleached kraft pulp, and 40-60% of cornstalk pulp are prepared. At this time, the wood pulp is subjected to beating to mix Yeosu Island with 400-550 ml CSF.

Bulk, opacity, smoothness, etc. are considered as important factors for producing printing paper. However, due to the inherent characteristics of corn stalk pulp, it has a disadvantage of low bulk and opacity, and thus, paper is manufactured by mixing conifer bleaching chemical pulp, hardwood bleaching chemical pulp, and bleaching chemical thermomechanical pulp. The mixing ratio is controlled within the range of 1-5% of conifer bleaching chemical pulp, 20-50% of hardwood bleaching chemical pulp, 20-50% of corn stalk pulp and 5-10% of bleaching chemical thermomechanical pulp, depending on the nature of the paper to be manufactured. Can be. In the case of corn stalk pulp, it is treated only with deflakes, as in the manufacture of toilet paper. In the case of coniferous and hardwood chemical pulp, the Yeosu Island is treated at 400-500 ml CSF.

As a filler, hard calcium carbonate (PCC), heavy calcium carbonate (GCC), talc, clay may be used, and the dosage is adjusted according to the use of the paper to be produced within the range of 5-25%. Can be.

As the sizing agent, an alkyl ketene dimer (AKD), an alkenyl succinic anhydride (ASA), a reinforced rosin emulsion, and the like may be used, and the dosage may be controlled within a range of 0.05-6%.

Fillers and sizing agents need to use retention agents because they cannot settle on pulp fibers themselves. Such retention agents include cationic starch, amphoteric starch, cationic and anionic polyacrylamide, polyethyleneimine, colloidal silica and bentonite bentonite, organic microparticles, and the like can be used.

Example

The examples presented below relate to the method and quality of producing pulp from corn stalks and to paper making to demonstrate the superiority of the invention. Therefore, the scope of the present invention is not intended to be limited or limited by the examples.

Example 1

Corn bar was cut to 1.5 cm in length and hit with a high speed rotor for 10 minutes, and the inside and the shell were separated by a screen. 400 g of the separated sheath was put into a laboratory digester (volume 4 liters), and caustic soda (sodium hydroxide) made of an aqueous solution corresponding to 13% of active alkali and 15% was added thereto. The liquor ratio was 5: 1, and the top was pressed with a metal weight to allow the corn liquor chips to be sufficiently immersed in the cooking liquor and cooked at 150 ° C. for 70 minutes, 90 minutes and 120 minutes. Was carried out. The cooked cornstalk chips were washed and rejected using a vibrating screen. After screening, the pulp is measured for yield, kappa number, and brightness, and a light mechanical shock is applied for 10 minutes without a weight using a laboratory beater. After the preparation, a handsheet of 60 g / m ² of basis weight was prepared using a laboratory handsheet machine. The prepared sheet was humidified in a constant temperature and humidity room for 1 day, and then the apparent density, tensile index and burst index were measured according to TAPPI Standard. The experimental results are summarized in Table 3, and considering the quality of the unbleached cornstalk pulp, it can be seen that it can be sufficiently used as a raw material for manufacturing industrial paper.

[Example 2]

In order to evaluate the toilet paper characteristics of bleached cornstalk pulp, mixed paper was prepared with 100% corns bleached pulp and wood chemical pulp to compare with KS standard and prototype. Burst strength, tensile strength, and absorbency of the toilet paper made from corn stalk pulp met KS standards, and the burst strength was better than that of commercial toilet paper.

Example 3

A laboratory study was carried out to prove that the bulk and opacity of paper can be produced by mixing pulp such as conifer bleaching chemical pulp, hardwood bleaching chemical pulp, and bleaching chemical thermo-based pulp. Heavy calcium carbonate was used as a filler, and a micro particle system using bentonite and cationic polyacrylamide was used as a retention agent. According to the experimental results, it is confirmed that the bulk and opacity, which are the major disadvantages of cornstalk pulp, can be improved through the mixing of pulp.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art to which the art belongs can make various modifications and other equivalent embodiments therefrom. I will understand. Therefore, the true technical protection scope of the present invention will be defined by the claims below.

100: casing 200: rotating body
210: shaft 220: cover member
230: hitting portion 232: plate
234: bar 236: batting rib
300: baffle 400: crawler feeder
500: vibrating screen unit 510: frame
520: mesh screen group 522,524: first and second mesh screen
600: feedback feeder

Claims (17)

Casing for injecting the cornstalk to the upper side in a free fall manner to induce discharge to the lower side; And
It includes a rotating body that is inserted into the casing and rotates and hits the cornstalk introduced into the chip state,
The rotating body, the shaft is inserted into the casing is rotated by an external force;
A cover member rotatably inserting the shaft and connected to the whole or part of an open upper side of the casing; And
It is formed on the circumferential surface of the shaft and includes a blow to strike the cornstalks introduced into the casing,
The casing is formed on the inner side baffle cornstalk pre-treatment device, characterized in that to improve the impact of the cornstalk.
The method of claim 1, wherein the hitting portion,
A plurality of plates formed along an axial direction of the shaft; And
Corn bar pre-treatment apparatus comprising a plurality of bars formed along the edge of each of the plates.
The method of claim 2,
The striking unit, the cornstalk pretreatment apparatus is formed detachably on the bar and comprises a striking rib to strike the striking cornstalk falling.
The method of claim 3, wherein
Corn bar pretreatment apparatus characterized in that the bar or the hitting ribs form a curved portion.
The method of claim 4, wherein
The shaft is connected to the gearbox cornstalk pre-treatment device, characterized in that the rotational speed is adjustable.
delete The method according to any one of claims 1 to 5,
The casing forms an inlet on the upper side or the circumferential surface to receive the cornstalks;
Corn bar introduced into the inlet is characterized in that the cornstalk pre-treatment device is continuously supplied by the tracker feeder.
The method according to any one of claims 1 to 5,
The casing has a cornstalk pre-treatment apparatus characterized in that it comprises a vibrating screen portion for separating the cornstalks falling hit by size.
According to claim 8, The vibration screen unit,
A frame provided at the lower side of the casing and configured to discharge a cornstalk that is hit and falls;
A plurality of mesh screens stacked to be inclined inside the frame, the mesh screen group including a mesh screen filtering a cornstalk with a larger mesh from the lower side to the upper side;
Discharge holes through the circumferential surface of the frame for discharging cornstalks filtered by each of the mesh screen; And
Corn bar pre-treatment apparatus comprising a vibration unit for imparting vibration to the frame.
The method of claim 8,
Corn bar separated by size and filtered is cornstalk pre-treatment device, characterized in that the feed back to the casing by the feedback feeder.
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