KR20090116012A - Polymer composite using cornstalk rind powder as its bio-fiber and the method and the apparatus for classifying the cornstalk rind powder from ground cornstalk - Google Patents

Abstract

PURPOSE: A polymer composite is provided to ensure excellent strength, durability and flexibility, and to improve hardness and workability by comprising cornstalk rind powder with excellent properties. CONSTITUTION: A polymer composite comprises a bio fiber consisting of cornstalk rind powder, and a polymer selected from the group consisting of polypropylene, polyethylene, and polyvinyl chloride. A method for separating cornstalk rind powder comprises the steps of: pulverizing cornstalk; and collecting cornstalk powder by injecting the pulverized cornstalk in a wind path.

Description

Polymer composite using cornstalk rind powder as its bio-fiber and the method and the apparatus for classifying the cornstalk rind powder from ground cornstalk}

The present invention relates to a polymer composite comprising a biofiber, and more particularly, to a method for separating and separating a polymer composite and a cornstalk shell powder including a powder of a cornstalk shell portion, rather than the whole cornstalk powder. will be.

Polymer composite is a mixture of plant bio-fibers, such as wood powder, with petrochemical polymers such as polypropylene (PP), polyethylene (PE: polyethylene), and vinyl chloride (PVC: polyvinyl chloride). After, it refers to a product formed by adding a coupling agent (coupling agent), UV stabilizer (UV Stabilizer), UV absorber (UV Absorber), a colorant (Pigment), etc., OSB (Oriented Stranded Board), Particle Board (Particle Board), It's completely different from MDF (Medium Density Fiberboard) and is commonly called Synthetic Wood or WPC (Wood Plastic Composite). OSB and particle boards are not powdered biofibers, but square-shaped biofiber flakes with at least one side of 25mm or more, and MDF is manufactured by press-molding fibers extracted from plants into cotton-like shapes. , Urea, soy bean protein, and similar adhesives are used. Typically, OSBs, particle boards, MDFs, etc. are classified as "composite," but are completely separate from "Bio-fiber polymer composites." Polymer composites, which do not use adhesives, began to be used in the 1990s, and in the 2000s, a wide variety of materials such as outdoor decking, landscaping, building exteriors, stair handles, wooden house structural materials, interior decoration materials, automotive interior materials, container box interior materials, ship interior and exterior materials, etc. It is used in the field. The global market is growing by more than 10% every year due to its semi-permanent durability, water resistance, non-toxicity and ease of molding. The process of making a polymer composite can be divided into two parts. The first step is to combine the elements, combining the elements, raising the temperature to just under 200 degrees Celsius. This is called compounding, and the intermediate material obtained through this process is called compound. In the second process, the compound is put into a molding machine such as an extruder or an injection molder and extracted into the shape of the product. Unlike conventional composites such as OSB, particle board and MDF, polymer composites are characterized by no adhesives.

Wood powder has conventionally been used as a representative biofiber for producing polymer composites. For this reason, polymer composites have been called "wood plastic composites" (WPC). However, wood powder has the following problems as a raw material of the polymer composite. First, due to the fact that it is pulverized into a powder of too small size (100-300 micro meter), and secondly, a lot of biofibers are lost in the process of decomposing lignin, thereby enhancing the structure as a fiber. There is a limit to the harvest. Therefore, since the structure reinforcing function as a fiber is deteriorated, in the process of forming a polymer composite product, when using the existing wood powder, the compound is pressed very hard for strength strengthening to make a finished product. This can also be seen in the fact that the specific gravity (1.2-1.5) of the finished polymer composite is much higher than that of the compound (0.49). Since wood powder does not play a role as a biofiber, the fact that many raw materials are added and hard pressed to make a finished product becomes a factor that eventually leads to an increase in material costs, production facility investment costs, and energy costs. In addition, the polymer composite product using the wood powder has the disadvantage that the product itself is too heavy and the hardness is poor workability.

Recently, it has been known that biofibers contained in corn stalks have several advantages. As a biofiber, the cornstalk and wood powder are compared as follows. Here, the wood powder is made of northern soft wood such as unsong.

Fiber length (mm) Fiber diameter (micron) Cellulose and hemicellulose (%) Lignin (%) Polysaccharides (%) Northern Softwood 2.7-4.6 32-43 40-52 26-32 8-12 Corn stand 1.0-1.5 18-22 46-52 16-17 27-28

In the table, the higher the specific gravity of cellulose and hemicellulose, the more robust the fiber, and the higher the specific gravity of lignin, the harder and lower the strength. Therefore, corn bran has an excellent characteristic of high cellulose density and low lignin ratio, compared to wood powder. In addition, the fiber of corn cob is only about 20 µm, which is half the thickness of the northern soft wood, so the bond is very high when mixed with the polymer. On the other hand, the short length of corn cob fiber compared to wood can not be a relative disadvantage. This is because, in the case of wood, it can only be used by grinding into very fine particles having a size of 0.1 to 0.3 mm. The reason for making the wood powder fine is that it is necessary to use chemicals to lower the lignin content and neutralize the weakly acidic properties. Northern soft wood has a pH value of about 8, which must be neutralized to be used as a raw material for the compound. Since the surface area of the particles must be wider to improve the efficiency of chemical treatment and reduce the amount of wastewater discharged, wood powder biofibers are provided in very fine powders of 0.1 to 0.3 mm in size. As a result of fine milling and chemical treatment, the wood powder is a result of which the strength as a biofiber is greatly impaired, but rather remains as a filler. Corn cobs, on the other hand, can be added directly to raw materials without undergoing this chemical process. It can be used immediately without chemical treatment, eliminating the process and eliminating the need to break the particle size into fine powders to increase process efficiency. Rather, the particle size can be maintained to an unobtrusive level for the polymer composite finished product user. Although cornstalks have this potential advantage, it is a reality that no attempt is made to mass produce cornstalk powder in the polymer composite industry.

It is therefore an object of the present invention to provide a polymer composite comprising high strength corn cob husk powder.

Another object of the present invention is to provide a separation method for separating the powder formed from the cornstalk shell portion of the cornstalk as a method of separating the cornstalk shell from the cornstalk, after the whole cornstalk powder. will be.

In order to achieve the above object, the present invention, the bio fiber made of corn bark powder (bio fiber); And it provides a polymer composite comprising a polymer selected from the group consisting of polypropylene, polyethylene, vinyl chloride and the like. Here, the biofiber is 50 to 85% by weight relative to the polymer composite, the length of the corn husk powder is preferably 0.1 to 10 mm based on the longest side or diameter. In another aspect, the present invention comprises the steps of grinding the cornstalk; And injecting the pulverized corn cob powder into a wind path so that the corn cob husk powder having a greater specific gravity than the corn cob powder falls, and the corn cob powder having a smaller specific gravity than the corn cob husk powder moves with the wind. Provided is a method for separating cornstalk husk powder.

Here, the corn cob powder falls in the collecting section in which the speed of the wind is reduced; And forming pellets by using the dropped corncob powder. In addition, the cornstalk shell separation device for grinding the cornstalks, the mill is a cornstalk powder conveying tube for transferring the ground cornstalk powder is formed at one end; Fan to produce wind; One end is connected to the fan and the wind is acting at a constant speed, and the corn cob powder transfer pipe is connected to a predetermined amount of corn cob powder per unit time, and the corn cob powder contained in the injected, A wind passage including a “shell powder dropping portion” where a relatively heavy shell powder falls and a collecting portion where relatively light weight powder falls; One end is connected to the shell powder dropping portion, the shell powder transfer pipe for transferring the dropped shell powder to the next step; One end is connected to the collection part in which the relatively light weight specific gravity powder falls, and it is comprised by the rapid delivery powder conveying tube which transfers the said rapid growth powder to a pellet manufacturing process. Here, the collecting portion, as a part of the wind passage, the cross-sectional area of the wind passage is rapidly increased, so that the speed of the wind is rapidly lowered to make the space of the relatively low-density inner core powder loaded on the wind to cause the natural falling motion It is preferable. In addition, it is preferable to remove the risk of serious pollution caused by the fine powder by making the solid powder, which is a very small specific gravity powder, connected to the pellet maker through the solid powder conveying tube without being exposed to the outside atmosphere. Do.

As described above, since the polymer composite including cornstalk shell powder according to the present invention includes cornstalk shell powder having excellent physical properties, strength, durability, and flexibility are excellent. In addition, the cornstalk shell powder according to the present invention is characterized in that the price of cornstalk shell powder is low and the raw material cost is reduced, and the strength is maintained even after foaming, so that the polymer composite may be economically produced. When foaming, the product is not broken or damaged during cutting, screwing, tarkering, drilling, and the like, so that the existing polymer composites are too heavy and have high hardness to compensate for the poor workability. In addition, the method and device for separating cornstalk shell powder can be used to produce cornstalk shell powder, which has the best properties as a polymer component raw material, in an economical manner so that cornstalk, which is a valuable agricultural by-product, can be used as a valuable environment-friendly resource. To be able. Accordingly, corn stalks, which had previously been burned or rotted, have great economic value. In addition, the separation method and the device, by separating the very light specific gravity corncob powder without being exposed to the outside atmosphere and compacted into pellets, as well as to make a corncob pellet that can be used as a quality livestock feed, It is characterized by the fact that very light specific gravity powder is scattered in the atmosphere, which eliminates the risk of seriously threatening the health of workers and neighboring residents.

Hereinafter, with reference to the accompanying drawings will be described in detail a separation method and a separation device of the polymer composite and corn bark shell powder comprising a corn husk powder according to an embodiment of the present invention.

The polymer composite according to an embodiment of the present invention includes a bio fiber made of corn husk shell powder and a polymer selected from the group consisting of polypropylene, polyethylene, vinyl chloride, and the like. The present invention is a method of obtaining cornstalk shell powder, which is not a method of pulverizing the shells after separating the shells and the corkscrews of cornstalks, but first crushing the whole cornstalks into powder, followed by the powders and the components of the skins generated from the shells. It presents a way to separate the powder produced in.

The cornstalk powder itself, before being separated into the bark powder and the rapeseed powder, also has superior properties to the wood powder when used as a raw material for the compound and polymer composite. Nevertheless, the actual industrial field does not use corn cob powder as a raw material. The present invention starts with the discovery that the reason is due to the problem of homogeneity and the problem of volume and specific gravity.

Specifically, the polymer composite is manufactured by molding a compound in which a vegetable biofiber and a petrochemical polymer are mixed and blended. When making a compound, the homogeneity of the biofibers and the volume difference between the biofibers and the polymer, that is, the specific gravity of the biofibers, are very important issues. If the raw material of the biofiber is not homogeneous or the volume difference between the biofiber and the polymer is too large, it may not be possible to produce a good compound. That is, corn cob powder is not suitable for use as a raw material for polymer composites in homogeneity and volume (specific gravity).

First, looking at the problem of homogeneity, the Whole Cornstalk (WCS) consists of "Cornstalk Rind (CSR)" and "Cornstalk Pith (CSP)". Other Anatomical Elements (AEs). The two substances differ not only in the composition of cellulose (Cellulose and Hemi cellulose) and lignin (Lignin), but also by five times in volume specific gravity. Corn cob husk powder is more flexible and solid than wood powder and has a specific gravity of 0.25. Corn cob powder, on the other hand, is as hard and hollow as a broken cane and has a specific gravity of only 0.05.

Corn cob powder is poorly homogeneous because it is a mixture of two anatomical element particles with different physical properties, and thus is not a suitable raw material for producing a high quality compound. Therefore, when corn cob powder is used as a biofiber, instead of one homogeneous biofiber particle, two bio-mass materials with different physical properties, that is, corn cob husk particles and corncob particles, It is input. Corn cob husk powder is a very good quality biofiber, whereas corncob meal is just a solid waste of lignin and polysaccharides. In other words, when corn cob powder is used as a raw material, the compound facility is not composed of two materials, a biofiber and a polymer, but a biofiber corn cob husk powder, a polymer, and a corn waste powder that is only "garbage". Three materials are subjected to loads that need to be compounded.

Let's look at the second problem with cornstalk powder: volume, specific gravity. Corn cob powder is not usually "garbage," but it can be called "malignant waste", which greatly inflates the volume of corn cob powder and reduces its weight. This is clearly shown in the following table.

When mixed with corn cob powder importance Volume ratio (%) Weight ratio (%) Corn cob powder 0.12 100% 100% Cornstalk husk powder 0.25 34% 72% Corncob powder 0.05 66% 28%

As shown in the table, the specific gravity of the cornstalk powder in the Agitated State is only about 0.1 g / cm ³ . In addition, about two-thirds of the volume does not provide the function of the actual fiber, but is occupied by corncob powder, a "bad waste" having properties that worsen the properties of the polymer composite product. However, in the polymer composite, the blending ratio of biofiber and polymer reaches 70:30 or 80:20 by weight. The specific gravity of wood powder used is about 0.2 and the specific gravity of petrochemical polymer is about 1 or so. Therefore, the volume difference between the wood powder biofiber and the polymer is about 12: 1 when the blending ratio is 70:30 and about 20: 1 when 80:20. Using a cornstalk powder with a specific gravity of only 0.1, which is half that of the wood powder, the volume difference is 24: 1 at the 70:30 blending ratio and 40: 1 at the 80:20 blending ratio.

This causes a very serious problem for the following reasons. Biofibers and polymers are materials that do not mix well with water and oil. For two materials that do not mix well, the larger the difference in volume, the more difficult it is to mix and combine them. The larger the volume difference between the biofiber and the polymer, the greater the load and function that the compounding equipment has to handle. In other words, when trying to knead the vegetable biofibers and petrochemical polymers with completely different physical properties, if the volume difference between the two materials is too large, the compound production itself becomes impossible. If cornstalk powder is used instead of wood powder, the volume difference becomes so large that it is impossible to produce a good compound.

Therefore, separating the corncob powder from the cornstalk powder not only solves the problem of homogeneity, volume and specific gravity, but also the components of the biofiber are much better. Here, the characteristics of the corn cob husk powder will be described using the table below.

importance Cellulose Content (%) Lignin Content (%) Corn cob powder 0.1 46-50% 16-17% Cornstalk husk powder 0.25 68% 10% Northern Softwood 0.2 40-52% 26-32%

As shown in the table, in the case of corn husk powder, the cellulose content reaches 68%, and the lignin content deteriorates the physical properties of the product is only 10%. Therefore, it can be seen that corn cob husk powder has physical properties that improve properties such as durability of the polymer composite.

The length of the corn cob husk powder used as the biofiber is 0.1 to 10 mm, preferably not more than 10 mm in the vertical direction, and 0.1 to 7 mm in the horizontal direction. In this case, "vertical direction" means perpendicular to the ground surface when the cornstalks grow, and "horizontal direction" means horizontal to the ground surface when the cornstalks grow. On the other hand, the biofiber made of the corn husk powder is preferably 50 to 85% by weight relative to the polymer composite of the present invention. If the ratio of corn to husk powder is less than 50%, the polymer composite gives a plastic-like feel instead of a bio property, ie a "wood-like feel". On the other hand, when the ratio of the cornstalk husk powder is higher than 85%, the structural stability and strength of the polymer composite is weak.

The polymer is selected from the group consisting of polypropylene, polyethylene, vinyl chloride and the like. In addition to the above components, the polymer composite of the present invention may include other conventional additives such as a binder, a lubricant, a UV stabilizer, a UV absorber, a colorant, a microbial inhibitor such as a mold, and the like.

The polymer composite according to the present invention is produced by first forming a compound, which can be referred to as an intermediate material, and then molding the compound by molding into a molding machine such as an injection molding machine or an extruder. Two different techniques are used in the preparation of the compound. One is the extrusion method, in which a screw-shaped screw is mixed with a biofiber and a polymer in a rotating cylinder to press and knead and kneaded while raising the temperature to about 200 degrees Celsius to create a compound. The other is a heating mixer method, in which a mixture of biofiber and polymer is introduced into a mixer and mixed by continuously mixing while raising the temperature to about 200 degrees Celsius. The compound proposed in the present invention is a mixture of a bio-fiber and a polymer made of the corn husk powder, regardless of which of the above two processes is used. As mentioned earlier, efforts to use whole corn cob powder as bio-fibers have existed many times over the years, but have always failed in practical use. The present invention finds that the reason why the whole cornstalk powder cannot be put to practical use lies in the problem of homogeneity and volume (specific gravity). It suggests how to use it.

Features and other advantages of the present invention as described above will become more apparent from the following examples. Of course, the present invention is not limited to the following examples.

EXAMPLES Production of a Polymer Composite Containing Corn Bark Powder

Corn bark shell powder and regenerated polypropylene are blended in a 50:50 ratio by weight, and the corn bark powder and regenerated polypropylene are mixed by an extrusion method, that is, a screw-shaped screw is rotated. It was pressed to raise the temperature to around 200 degrees Celsius, and made a compound. The compound was extruded in a twin screw extruder to produce a polymer composite comprising corn cob powder.

Comparative Example Production of Polymer Composite Containing Wood Powder

Wood powder and regenerated polypropylene were blended in a 50:50 ratio by weight to form a compound by an extrusion method, and then extruded in a twin screw extruder to produce a polymer composite including wood powder. In order to show the properties of the polymer composite produced according to the Examples and Comparative Examples, the results are shown in Table 1 below. Test methods and equipment used conventional methods.

division Comparative example Example density 1.2-1.5 0.8-0.95 Flexural strength 41 N / mm ² 51 N / mm ² Screw holding force 1500N 1980 N Water resistance (water absorption) 0.2% 0.1% Linear expansion 2.5 x 10 ^-5 2.5 x 10 ^-5 Cold resistance (-30 ℃) Tensile 36N / mm Tensile 43N / mm Anti-slip 20 20 Workability High hardness, tends to break during work Easy drilling, threading, tarkering and cutting

As shown in Table 1, the polymer composite containing the cornstalk shell powder according to the embodiment has a density of 0.8-0.95, which is relatively 25% lower than that of the polymer composite including the wood powder according to the comparative example. , Flexural strength and screw holding force were relatively high, 51 N / mm ² and 1980 N, respectively. Therefore, there is a feature that is easy to punch, thread work, tarker work, cutting. In addition, the water resistance is low as 0.1%, cold resistance is characterized by a relatively high 43 N / mm in tension. In particular, when targeting the same strength, it can be seen that the polymer composite including the cornstalk shell powder of the present invention has a specific gravity of 25% or more lower than the polymer composite including the wood powder. That is, even if the polymer is foamed during the molding process to reduce the specific gravity of the product, the same level of strength is obtained. Foaming means using the foaming agent (foaming agent) in the molding process to create a myriad of microcavities in the product. If the specific gravity is more than 25%, raw material consumption is reduced by 25%.

Next, a separation method for separating cornstalk shell powder from cornstalks will be described. Separation method of corn bark shell powder according to the present invention, instead of the method of pulverizing the shell after separating the shell and the core in the corn bar, after crushing the whole corn bark into a powder, therefrom, By the separation method for separating the powder generated in the inner part. For convenience, this method is referred to as "pre-milling method". 1 is a flowchart illustrating a "separation method after pre-milling" for obtaining corn cod husk powder, according to an embodiment of the present invention. As shown in Figure 1, the separation method according to the present invention comprises the steps of grinding the cornstalk (S 10); And separating the pulverized cornstalk powder into cornstalk shell powder and corncob meal using wind and specific gravity difference. In particular, the step of separating the cornstalk shell powder using the wind and specific gravity difference, the cornstalk shell powder having a greater specific gravity than the corncob powder falls by dropping the pulverized cornstalk powder into the wind passage, cornstalk Corn cob powder having a smaller specific gravity than shell powder uses a method of moving with the wind. More specifically, in the present embodiment illustrated in the drawings, by applying wind to the pulverized corn cob powder in a direction opposite to gravity, the corn cob husk powder having a greater specific gravity than the corn cob powder penetrates the wind and falls by gravity, Corn cob powder having a smaller specific gravity than the corn cob husk powder uses a method of moving with the wind (S 20). However, there is no reason for the wind path to form in the direction opposite to gravity. Even if the wind passage is formed horizontally, the space division of the "shell powder falling part" in which the cornstalk shell powder falls and the collection part in which the cornstalk bundle powder falls is possible. The core concept of the present invention is the principle of using the wind and the specific gravity difference to separate the shell powder dropping portion and the inner shell powder collecting portion space.

In the method using the wind and the specific gravity difference, the specific gravity of corn cob husk powder in an agitated state is 0.25, and the specific gravity of corn cob powder is 0.05. The cornstalk is divided into two anatomically distinct elements: the cornstalk shell and the corncob. For example, at a certain speed, the cornstalk shells of about 10 mm in size and the corncob slices are blown vertically, that is, the winds blowing from the bottom while falling in the wind moving in the opposite direction to gravity. Do an experiment to determine if an object stops falling. The speed at which a falling object stops falling due to wind in the direction opposite to gravity is called "Fall Termination Velocity" (FTV). For corn cob shell slices of 10 mm in size, the drop stopping speed is about 7 m / s, and for the same size corn slices, the drop stopping speed is about 2 m / s. That is, the two materials differ by as much as 5 m / s in the drop motion stop speed. Thus, using this principle, it is possible to easily separate the cornstalk shell powder and the corncob powder in powder form, not in sections. Specifically, for the needle-shaped powder having the longest side of 8 mm, when blowing 4 m / s of wind, the corncob powder floats up and the corncob husk powder continues to fall. The wind speed that separates these two types of anatomical elements (AEs) is called "Differentiating Velocity" (DV), and the most efficient value is called "Optimal Differentiating Velocity (ODV)".

The drop motion stopping speed is influenced by the size of the particles, varieties of corn, and moisture contained in the particles. For example, the smaller the particles, the larger the surface area per unit weight and the greater the frictional force with the wind. For example, it is easy to identify the values of the optimum differentiation rate separating the cornstalk husk powder and corncob meal by appropriate intervals for various particle sizes ranging from 0.1 to 10 mm. In addition, the optimal rate of differentiation should be adjusted according to the variety and season of corn. For example, in a season with high humidity, the corncob meal contains more moisture than the corncob husk powder, so the value of the stopping motion speed is increased, so that the optimum differential speed may be increased.

The present invention proposes a method for preprocessing corncobs, which is not a method of cutting into rectangular sections, but a method of grinding into a thin, long needle or sawdust powder. This is because, in the case of a rectangular section, there is a fear that the shell portion and the inner portion are not anatomically separated. On the other hand, on the longest side, in the shape of a long needle or sawdust powder not exceeding 10 mm, the shell portion and the inner portion of the shell, in the form of powder, are anatomically separated and mixed (ASPM: an anatomically separated). and particle-wise mixed state).

"Pulverization" proposed by the present invention means pretreatment of cornstalks so as to have a size of 0.1 to 10 mm on the longest side, and the pulverized material is called "cornstalk powder". In the corn cob grinding, the target particle size must satisfy the following two conditions. First, the shell and the core should be small enough to be separated anatomically enough. Second, the shell and the core drop collecting part should be sized so as to be spatially separated when the wind is separated from the wind passage. The particle size that satisfies these two conditions is called "Particle Size for Separation" (PSS).

Referring to the separated particle size once again, the separated particle size is preferably 0.1 to 10 mm based on the longest side or diameter. If the length of the powder is smaller than 0.1 mm, a serious problem appears that the biofiber contained in the cornstalk is almost completely destroyed, which in turn leads to a problem of decrease in strength. On the other hand, if the length of the powder, whether it is a core or a shell, is greater than 10 mm, based on the longest side or diameter, the shell powder and the core powder are difficult to anatomically separate, resulting in a condition where the core is attached to the shell. Appearing, it is impossible to obtain a high quality biofiber made of shell powder.

Here, compare the "pre-crushing post-separation method" according to the present invention and the "chemical method" for fiber extraction, which is applied when using corn bar in MDF or pulp. If you're making MDF or pulp that requires fiber to be connected like cotton, you can't use a powdering method to anatomically separate the outer and outer shells. For MDF and pulp, it is more important that the fibers are connected together. Therefore, when making MDF and pulp, instead of crushing the cornstalks, one side is cut into sections of around 20 mm. Thereafter, the fibers are extracted by chemical methods, which are expensive for investment and production. On the other hand, the "pre-crushing post-separation method" according to the present invention, while grinding the whole corn bar, the separation particle size of about 0.1 to 10 mm. The cornstalk powder is separated into a powder generated from the cornstalk shell and a powder generated from the corncob using wind and specific gravity method. The present invention is not intended to extract cotton-like fibers, such as chemical fiber extraction, but to efficiently produce biofibers in powder form used as polymer composite raw materials. Therefore, in the separation method according to the invention, the separation particle size is preferably 0.1 to 10mm.

In addition, when the separated particle size is larger than the "Product Particle Size (PPS)" of the final biofiber product in powder form, it may be subjected to the grinding process once again. That is, when the value of the separated particle size is equal to the product particle size, one grinding is sufficient, but when the value of the separated particle size is larger than the product particle size, an additional grinding process may be performed after separation. Figure 2 is a flow chart illustrating a "line milling post-separation method" for obtaining corn cod husk powder according to another embodiment of the present invention. As shown in Figure 2, by using a wind and specific gravity method, after separating the cornstalk shell powder and corncob meal powder, and further performing the step of grinding the separated cornstalk shell powder (S 30), corn Depending on the purpose for which the bark powder is used, the size of the corn bark powder can be selected.

The separated cornstalk husk powder may be stored in a silo or may immediately enter a packaging step (S 40). And the corncob powder to be separated and moved with the wind is dropped from the collecting portion is the wind speed is reduced (S 50). In other words, in the collecting section where the wind speed is lowered, the moving wind speed becomes smaller than the 'dropping motion stopping speed' of the corncob meal. The dropped corncob powder may be compressed into a pellet (S 60). With the formation of the pellets, there is proposed a method for making a high-quality livestock feed while eliminating the risk of causing fatal pollution to workers and neighboring residents by scattering the small specific corn cob powder. Pellets refer to extruded bio-mass or polymer powder, such as sawdust and wood flour, into small cylindrical pellets. Bio-mass is a renewable organic material derived from energy-only crops and trees, agricultural products and sample crops, agricultural waste and debris, forest wastes and debris, aquatic plants, animal wastes, municipal waste, and other wastes. Energy sources include wood, plants, agricultural by-products, municipal waste and organic components in industrial waste.

Next, the separator for corn husk shell powder according to the present invention will be described. 3 is a view illustrating a separation device of corn husk shell powder according to an embodiment of the present invention. Separation device of corn husk shell powder is based on the 'wind and specific gravity difference method'. As shown in FIG. 3, the separator of cornstalk husk powder includes a grinder 10, a wind passage 24, a fan 60 for separating cornstalk husk powder and collects the corncob powder. And the inner powder collecting part 34 for the same.

The pulverizer 10 is to crush the corn stalks into a predetermined size, and put the corn stalks into the inlet, and grind the corn stalks to a predetermined separation particle size to make a mixed state (ASPM) after being anatomically separated. . The pulverized cornstalk powder is transferred to the wind passage 24 through the cornstalk powder delivery pipe 12. Movement through the transfer pipe 12 may be performed using compressed air or may be performed using a conveyor. The fan 50 is a means for generating wind, and generates wind so that the wind of a predetermined set speed, a predetermined set amount of wind passes in a direction opposite to gravity in the wind passage.

The shell powder dropping portion 24 is connected to the blower pipe 52 at the bottom, the wind is blown up from the bottom, the cornstalk powder transfer pipe 12 is located at the top, the ground cornstalk powder is Is committed. Thus, by the wind blowing from the bottom, that is, the wind moving in the opposite direction of gravity, the ground cornstalk powder is stopped, falls or rises. In particular, the strength of the wind is the value of the optimum differential speed (ODV), the cornstalk shell powder contained in the cornstalk powder is dropped by gravity, and the cornstalk powder will rise with the wind. Therefore, corn cod husk powder and corn cob powder are naturally separated by the wind having the optimum differentiation speed. In particular, an anemometer (not shown) is connected in the shell powder dropping portion 24, and the rotational speed of the fan motor is also precisely controlled. The optimum differentiation rate is adjusted according to the size of the powder, humidity and corn variety. One thing to note is that in the embodiment the wind path is formed in the vertical direction of the wind, it is also possible to implement a horizontal wind path that can be distinguished spatially the shell powder drop portion and the inner shell powder collection portion. For example, if cornstalk powder is introduced while the wind is blowing horizontally, the shell powder may fall away from the feeding position, and the inner shell powder may move through the wind and fall relatively far away. .

A shell powder transfer pipe 51 is formed at a lower end of the shell powder dropping part 24, and the shell powder transfer pipe 51 is connected to the shell powder silo 54. In addition, the shell powder opening and closing device 25 may be formed at one end of the shell powder conveying pipe 51 so as to adjust whether the dropped cornstalk shell powder is transported. The shell powder silo 54 is a place for storing cornstalk shell powder, and a conventional silo may be used. The shell powder silo 54 is connected to the shell powder packaging machine 56. The shell powder packing machine 56 may be a conventional packaging machine as a means for packaging corn bark shell powder in a predetermined unit.

4 is a view illustrating a separation device of cornstalk shell powder according to another embodiment of the present invention. As shown in FIG. 4, the separation device of cornstalk shell powder according to another embodiment of the present invention is the shell. The secondary mill 52 is located between the powder dropping part 24 and the shell powder silo 54. The secondary grinder 52 is an apparatus for additionally crushing the separated cornstalk shell powder, and may be pulverized to an appropriate size according to the purpose of using the cornstalk shell powder. That is, when the separated particle size of the grinder 10 is larger than the product particle size, the cornstalk husk powder is ground using the secondary grinder 52. The secondary grinder 52 may be a conventional grinder, and may be used by modifying the grinder 10.

The rapid powder collecting unit 34 is a device for collecting the corn cob powder that rises with the wind, the upper release guide 36 for changing the direction of the wind is formed. The wind rising from the bottom of the shell powder dropping portion 24 is raised to the top by changing the direction by the release guide 36 located in the upper portion of the wind passage (24). At this time, the cross-sectional area of the collecting part 34 is rapidly enlarged, and the wind speed is significantly reduced. In other words, the rate of ascent of the wind is less than the 'fall stop speed' of the solid powder. Therefore, the corncob powder which rises with the wind falls to the space between the shell powder dropping part 24 and the bundle powder collecting part 36 as the wind speed falls. In addition, if a bag filter (not shown) or a dust collector is attached to the final section where the wind is released, the solid powder does not fly out of the device at all.

A bottom powder transport pipe 41 is formed at a lower end of the rapid powder collector 34, and the rapid powder transport pipe 41 is connected to the solid powder silo 44. In addition, so that it is possible to adjust whether the drop of corn cob powder drop, the cob powder opening and closing device 35 may be formed at one end of the cob powder transfer pipe 41. The cob powder silo 44 is a place for storing the corn cob powder, a conventional silo may be used. The solid powder silo 44 is connected to a pellet maker 46. The pellet maker 46 is a device for forming a pellet to reuse the corncob powder, and has a structure very similar to that of a conventional wood pellet maker, so that the wood, rice straw, etc. as a pellet for the purpose of use as a livestock rug or fuel Modified conventional pelletizers can be used. In addition, the pellet maker 46 is connected to the pellet packing machine 48, the pellet packing machine 48 may use a conventional pellet packing machine.

5 is a view illustrating an apparatus for separating corn cob husk powder according to another embodiment of the present invention. As shown in FIG. 5, the apparatus for separating husk powder according to the present invention has a different form of a solid powder collecting part structure. Has The rapid powder collecting part 134 is connected to the upper end of the shell powder dropping part 24 through a connecting pipe 137 and has a larger cross-sectional area than the shell powder dropping part 24. Therefore, the wind moved through the connecting pipe 137 is reduced in speed, the corncob powder moved with the wind falls. In addition, a release guide 136 may be installed at the upper end to change the direction of the wind as needed, and at the lower end, the inner powder opening / closing device 135 is installed.

Next, the operation of the apparatus for separating corn cob husk powder according to an embodiment of the present invention will be described. The grinder 10 grinds a cornstalk with the predetermined particle size. The separated particle size is preferably in the range of 0.1 to 10 mm, based on the longest side or diameter. The pulverized cornstalk powder is introduced into the top of the shell powder dropping part 24 by the cornstalk powder conveying tube 12, and at the same time, the wind having the optimum differential speed by the fan 60 is the shell powder separator 24. Rise from bottom to top, ie in the opposite direction of gravity. Here, the optimum differentiation speed is preferably 1 m / sec to 4 m / sec, but this varies depending on the humidity, the size of the cornstalk powder and the variety of the corn itself. The cornstalk powder introduced into the shell powder separator 24 is a mixture of the powder produced from the cornstalk shell and the powder generated from the corncob, and the heavier husk powder is peeled off by the gravity drop motion. And the lighter weight powder is moved with the wind. The corn cob powder, as the rising wind is redirected by the release guide 36 and reaches the speed of the cob powder collector 34, and the speed decreases, the shell powder drop 24 and the cob powder collector 34 Will fall in between. The cornstalk husk powder dropped on the husk powder dropping part 24 is stored in the husk powder silo 54 through the husk powder conveying pipe 51, and when a predetermined amount is stored, it is transferred to the husk powder packing machine 56, Packed in a certain unit size. If desired, the dropped cornstalk husk powder may be further ground in a secondary mill 54 (see FIG. 4). The corncob powder dropped on the cobweb powder collecting part 34 is stored in the cobweb powder silo 44 through the cobcocotic powder feed pipe 41, and when a predetermined amount is stored, is transferred to the pellet maker 46 and formed into pellets. Then, it is packaged in a predetermined weight or volume through the pellet packing machine 48.

1 is a flow chart illustrating a "line milling post-separation method" for obtaining cornstalk shell powder in a vertical wind passage, according to one embodiment of the invention.

Figure 2 is a flow chart illustrating a "line milling post-separation method" for obtaining cornstalk shell powder in a vertical wind passage in accordance with another embodiment of the present invention.

Figure 3 is a view for explaining the separation device of corn husk shell powder according to an embodiment of the present invention.

4 is a view for explaining the separation device of corn husk shell powder according to another embodiment of the present invention.

5 is a view for explaining the separation device of corn husk shell powder according to another embodiment of the present invention.

Claims (10)

Bio fiber made of corn cob husk powder; And A polymer composite comprising a polymer selected from the group consisting of polypropylene, polyethylene, vinyl chloride, and the like. The polymer composite of claim 1, wherein the biofiber is 50 to 85% by weight relative to the polymer composite. The polymer composite according to claim 1, wherein the corn husk powder has a length of 0.1 to 10 mm. The polymer composite according to claim 1, wherein the corn husk powder has 60 to 70% of cellulose and hemicellulose and 5 to 15% of lignin in its composition. Grinding cornstalks; And Injecting the pulverized corn cob powder into the wind passage, the corn cob husk powder having a greater specific gravity than the corn cob powder drop in the corn cob husk powder dropping portion, and the corn cob powder having a smaller specific gravity than corn cob husk powder and the wind and A method for separating cornstalk husk powder comprising a cornstalk rapeseed powder collecting step, which moves together and drops in a collecting section where the wind flow rate drops rapidly. The method of claim 5, wherein the corn cob powder dropping in the collecting portion is the wind speed is reduced; And moving the dropped corncob powder through an air and an unexposed transfer pipe to produce pellets. The method of claim 5, wherein the separated cornstalk shell powder comprising the step of pulverizing again to the appropriate size. A crusher having a cornstalk powder conveying tube for pulverizing cornstalks and conveying the ground cornstalk powder at one end thereof; Fan to produce wind; One end is connected to the fan and the wind is operating at a constant speed, and is connected to the corn cob powder conveying pipe, a certain amount of corn cob powder is added per unit time, and the corn cob powder is contained in the injected cob, A wind passage formed by spatially distinguishing a "shell powder dropping part" which is a position where a relatively heavy specific gravity powder falls and a collecting part by which a relatively light specific gravity powder falls; One end is connected to the shell powder dropping portion, the shell powder transfer pipe for transferring the dropped shell powder to the next step; And Separation device comprising a coarse powder feed pipe for connecting one end is connected to the collecting portion in which the relatively light weight of the coarse powder is dropped to the pellet manufacturing process. According to claim 8, The cross section of the wind path is rapidly expanded than the shell powder dropping portion, so that the corn cob powder moving with the wind falls, and the drop of the cob powder collecting portion, A device for separating corn husk powder, which is connected to one end of a large-size powder conveying tube that can convey the powder so that it is not exposed to the atmosphere. The cornstalk stand according to any one of claims 8 to 9, wherein a pellet maker for producing pellets using the discharged corncob powder is formed at the other end of the cob flour feed pipe. Separator for peel powder.

Images