KR20240123452A - Paper containing surplus rice and rice husk and manufacturing method thereof - Google Patents

Abstract

A method for manufacturing paper including surplus rice and rice husk according to the present invention comprises the steps of: a) grinding rice and rice husk; b) mixing rice powder, rice husk powder, pulp, and a strength enhancer to prepare a composition; and c) dehydrating, pressing, and drying the prepared composition.

Description

Paper containing surplus rice and rice husk and its manufacturing method {PAPER CONTAINING SURPLUS RICE AND RICE HUSK AND MANUFACTURING METHOD THEREOF}

The present invention relates to paper using surplus rice and rice husk and a method for manufacturing the same, and more specifically, to paper that secures rigidity and elongation based on surplus rice and rice husk, thereby omitting a separate step of chemical treatment on the surface for recycling and reuse, and does not add unnecessary strength enhancers and inner size additives, and a method for manufacturing the same.

Recently, environmental issues related to the indiscriminate use of disposable products have been recognized as serious social problems worldwide. It is estimated that each Korean office worker uses about 500 paper cups and products per year. In addition, the amount of trees consumed in one year to make paper products amounts to about 12 billion, which means about 80,000 tons of natural pulp alone. In addition, when used paper products are buried in the ground for disposal, the amount of carbon dioxide emitted into the atmosphere while they decompose is also significant. In addition, about 11g of carbon dioxide is emitted to make one paper product, and a total of 132,000 tons of carbon dioxide is emitted annually.

As a means of solving these problems, the Ministry of Environment is implementing a policy to prohibit providing plastic and paper shopping bags and boxes to customers free of charge. In addition, the Ministry of Environment is restricting the use of disposable products in food service establishments such as cafes in order to minimize the use of disposable products. In addition, in the case of Europe, reduction targets are set for products used in member countries or separate taxes are imposed. This is because paper products have weak strength, are easily worn out, and have low elongation, so there are limitations in using them for multiple uses.

Meanwhile, in the past, in order to use paper products for multiple purposes, a coating film was formed on the surface of the paper product. However, when a coating film is formed on the surface of the paper product, the coating film must be removed using special equipment in order to be recycled. In addition, a difficult treatment procedure is required to remove the coating film, which incurs considerable costs. Therefore, instead of recycling paper products with a coating film formed, cases of being separated as general waste and incinerated or landfilled are continuously increasing.

In other words, it is necessary to develop paper that does not require separate chemical treatment on the surface, has rigidity and elongation, and can be recycled and reused.

The technical problem to be achieved by the present invention relates to paper and a method for manufacturing the same, which can reduce the amount of carbon dioxide generated when producing and disposing of paper and the amount of logging by including surplus rice and rice husk, which are natural resources.

In addition, the technical problem to be achieved by the present invention relates to paper and a method for manufacturing the same, which can omit a separate chemical treatment step on the surface for recycling and reuse by increasing rigidity and elongation based on surplus rice and rice husk.

In addition, the technical problem to be achieved by the present invention relates to paper and a method for manufacturing the same which can improve the binding strength with water by pulverizing surplus rice.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

In order to achieve the above-described technical task, a method for manufacturing paper including surplus rice and rice husk according to one embodiment of the present invention may include: a) a step of grinding rice and rice husk; b) a step of mixing rice powder, rice husk powder, pulp, and a strength enhancer to manufacture a composition; and c) a step of dehydrating, pressing, and drying the manufactured composition.

In the step b), the rice powder may be mixed in a ratio of 20 to 30%, the rice husk powder in a ratio of 20 to 30%, the pulp in a ratio of 40 to 60%, and the strength enhancer in a ratio of 0.5 to 1%.

In the step b), the rice powder may be mixed in a ratio of 20 to 40%, the pulp may be mixed in a ratio of 40 to 60%, and the strength enhancer may be mixed in a ratio of 0.5 to 1%.

In the above step a), the rice powder can be ground to a size of 250 to 300 mesh.

In the above step a), the grinding temperature of the rice powder and the rice husk powder can be set to 40 to 50 degrees.

The above-mentioned strength enhancer may include c-pam (cationic polyacrylamide), which is a water-soluble polymer electrolyte.

In addition, paper manufactured according to one embodiment of the present invention for achieving the above-described technical task can be manufactured by any one of the methods of claims 1 to 6.

In addition, for achieving the aforementioned technical task, paper including surplus rice and rice husk according to one embodiment of the present invention can be manufactured based on a composition produced by mixing rice powder, rice husk powder, pulp, and strength enhancer.

According to an embodiment of the present invention, when producing paper including surplus rice and rice husks, which are natural resources, the amount of trees consumed to form pulp can be drastically reduced. In addition, since surplus rice and rice husks are natural resources, they can be naturally decomposed by microorganisms in nature. Therefore, it is possible to reduce the amount of carbon dioxide emitted when landfilling or incinerating paper.

In addition, according to an embodiment of the present invention, when rice husk is included, the bonding with vegetable organic matter and vegetable materials can be improved and the elongation can be increased. In addition, by including surplus rice, the rigidity can be secured. In addition, since rice and rice husk are similar in physical properties, a coagulant used in the past is not required. Accordingly, paper manufactured based on surplus rice and rice husk can have sufficient rigidity and elongation to be used for recycling and reuse, and unnecessary strength-enhancing agents and internal sizing agents can be omitted. In addition, by controlling the mixing ratio and basis weight of rice, rice husk, and pulp, it can be used for recycling and reuse without performing a separate chemical treatment on the surface.

In addition, according to an embodiment of the present invention, water binding capacity can be improved by grinding and micronizing rice to about 300 mesh.

The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the detailed description of the present invention or the composition of the invention described in the claims.

Figure 1 is a drawing illustrating a method for manufacturing paper including surplus rice and rice husk according to an embodiment of the present invention.
Figure 2 is a drawing illustrating particles of pulverized rice according to an embodiment of the present invention.
Figure 3 is a drawing showing the results of a turbidity experiment on whether or not a polymer system according to an embodiment of the present invention is used.
Figure 4 is a drawing showing a graph of experimental results according to the mixing ratio of rice powder, rice husk powder, pulp, and strength enhancer according to an embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the attached drawings. However, the present invention can be implemented in various different forms, and therefore, it is not limited to the embodiments described herein. In addition, in order to clearly describe the present invention in the drawings, parts that are not related to the description are omitted, and similar parts are assigned similar drawing reference numerals throughout the specification.

Throughout the specification, when a part is said to be "connected (connected, contacted, joined)" to another part, this includes not only cases where it is "directly connected" but also cases where it is "indirectly connected" with another member in between. Also, when a part is said to "include" a certain component, this does not mean that other components are excluded, unless otherwise specifically stated, but that other components can be included.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this specification, the terms "comprises" or "has" and the like are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but should be understood to not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the attached drawings.

Figure 1 is a drawing illustrating a method for manufacturing paper including surplus rice and rice husk according to an embodiment of the present invention.

In step (S110), rice and rice husk can be pulverized by a pulverizer. Here, milling can be performed to break down rice and rice husk, which is the husk of the rice. The milled rice and rice husk can be pulverized into particles of a certain size to be made into paper. For example, rice can be pulverized into a size of 250 mesh to 300 mesh because the binding force with other properties is strengthened as the rice is finely granulated. In addition, when breaking down rice and rice husk, the pulverization temperature can be set to 40 degrees to 50 degrees. When the pulverization temperature is performed at 40 degrees or higher, mixing of the finely granulated rice itself can be prevented.

In step (S120), rice powder, rice husk powder, pulp, and a strength enhancer, etc. can be mixed. Since rice and rice husk are similar in physical properties, they do not require coagulants such as conventional talc, calcium carbonate, and titanium dioxide. However, when rice powder and rice husk powder are used in paper manufacturing, the bulk of the paper increases, while the heat-breaking length, specific compression strength, and bursting strength decrease, so a strength enhancer can be added to minimize the manufacturing process. Here, the strength enhancer can include c-pam (cationic polyacrylamide). c-pam is a water-soluble polymer electrolyte that can coagulate with water, which is a water-soluble substance, to form larger coagulants. That is, by adding c-pam, the binding characteristics with water can be improved. In addition, c-pam can be added in an amount of 0.5 to 1%.

For example, it can be mixed in a ratio of 20 to 30% rice powder, 20 to 30% rice husk powder, 40 to 60% pulp, and 0.5 to 1% strength enhancer. In addition, it can be mixed in a ratio of 20 to 40% rice powder, 40 to 60% pulp, and 0.5 to 1% strength enhancer. When rice husk powder is included in the mixture, it can improve the bonding with plant-based organic matter and plant-based materials, and can increase the elongation. In addition, since rigidity can be secured by including a sufficient amount of rice powder, it can solve the problem of low rigidity when using the conventional rice husk powder in paper manufacturing. That is, paper manufactured by including rice and rice husk can satisfy both rigidity and elongation.

In addition, water can be added to the mixture to form a composition. Here, the order in which the materials and water are added can be set in consideration of the characteristics of each raw material.

In step (S130), the manufactured composition can be produced into paper by dehydration, pressing, drying, etc. At this time, since the bonding strength with the pulp is increased by the undifferentiated rice, the step of additionally adding a strength enhancer or an inner size other than c-pam can be omitted. In addition, the produced paper can be recycled and reused without performing a separate chemical treatment on the surface.

Figure 2 is a drawing illustrating particles of pulverized rice according to an embodiment of the present invention.

Referring to Fig. 2, when rice is pulverized to about 50 um in size (300 mesh) (b), the undifferentiated rice particles can be formed in a form in which they are thinly pressed by impact and attached to the surface of other particles. In addition, it can be confirmed that the bonding force between particles is strengthened when rice is pulverized to about 50 um in size (300 mesh) (b) compared to when rice is pulverized to about 150 um in size (100 mesh) (a). That is, as the rice is pulverized, the existing angular polyhedral structure can change into a form in which the particles are entangled with each other. At this time, as the rice is pulverized, the particle size decreases, but the overall size can increase as the particles are attached to each other.

Meanwhile, referring to graph (c) showing the water binding capacity of undifferentiated rice particles (PRS, Pulverized Rice Starch) compared to undifferentiated rice particles (RS, Resistant Starch), it can be confirmed that the water binding capacity of undifferentiated rice particles (PRS) is about 2.6 times higher than that of undifferentiated rice particles (RS). The water binding capacity is due to the amorphous portion of the rice particles, and as the amorphousness increases, the internal density decreases, which improves the water binding capacity. This is because, as rice is undifferentiated and its crystallinity increases, water penetrates including undifferentiated particles and particles of multiple rice particles that are combined as a single particle. In other words, as rice is undifferentiated, the specific surface area increases, which increases the water binding capacity. Here, rice particles crushed to about 150 um in size (100 mesh) (a) can be defined as undifferentiated rice particles, and rice particles crushed to about 50 um in size (300 mesh) (b) can be defined as undifferentiated rice particles.

Figure 3 is a drawing showing the results of a turbidity experiment on whether or not a polymer system according to an embodiment of the present invention is used.

Turbidity experiments can be conducted based on the dehydration solution after the composition is formed and the dehydration process is performed. The dehydration solution can include a dehydration solution (C) that does not use a single polymer system or a dual polymer system, a dehydration solution (S) that uses a single polymer system, and a dehydration solution (D) that uses a dual polymer system.

Table 1 shows data on the results of the turbidity experiment.

number C S D 1 435 28.7 21.2 2 435 81.4 19.6 3 435 65.2 20.3

Referring to Figure 3 and Table 1, the turbidity test results show that the dehydration solution (C) that did not use the single polymer system or the dual polymer system had the highest turbidity. In other words, it can be determined that the rice and rice husk were not combined and therefore not maintained when the single polymer system or the dual polymer system was not used.

In addition, the dehydration solution (S) using a single polymer system showed a decrease in turbidity compared to the dehydration solution (C) not using a single polymer system or a dual polymer system, which can be understood as the maintenance of a certain amount of rice. However, since the dehydration solution (S) using only a single polymer system has a relatively large deviation, it can be judged that using a single polymer is not suitable.

Meanwhile, the dehydrated solution (D) using the dual polymer system was analyzed to have relatively low turbidity and deviation, and thus can be judged to be suitable for paper manufacturing based on rice and rice husk.

Figure 4 is a drawing showing a graph of experimental results according to a combination of rice powder, rice husk powder, pulp, and strength enhancer according to an embodiment of the present invention.

First, the mixing ratio and experimental data of rice powder, rice husk powder, pulp and strength enhancer can be referred to Table 2. At this time, the strength enhancer can be added at a ratio of 0.5 to 1% (not shown).

Mixing ratio Target weight Weight, g Weight, g/ Thickness, um Tensile strength, kN/m Tensile index, Nm/g Ten-kilometer length, km Bursting strength, kPa Vertical compressive strength, kN/m Specific compressive strength, kN/m*g/m2 Pulp: Rice: Rice Husk
=50 % :25% :25% 120 2.75 102.52 260.18 1.20 11.73 1.20 65.98 0.22 22.25 150 3.51 130.65 309.46 1.70 13.02 1.33 91.66 0.40 51.61 180 4.28 159.35 380.92 1.88 11.81 1.20 129.00 0.51 81.43 Pulp: Rice
= 70% : 30% 120 3.17 118.13 268.76 1.40 11.86 1.21 89.96 0.38 44.42 150 4.07 151.63 322.08 1.90 12.35 1.26 122.06 0.38 57.92 180 4.96 184.68 359.33 2.08 11.29 1.15 151.27 0.51 94.55 100% pulp 120 0.31 137.20 289.72 2.24 16.50 1.68 113.36 0.40 54.19 150 4.85 180.40 339.19 2.67 14.80 1.51 134.39 0.49 88.57 180 5.86 217.97 417.91 3.20 14.78 1.51 161.16 0.58 126.64

Referring to FIG. 4 and Table 2, the breaking length, non-compressive strength and bursting strength can be compared according to the mixing ratio of the composition including at least one of pulp, rice or rice husk. Here, the breaking length is a method of indicating the tensile strength of paper, and refers to the length of a piece of paper when the end of a tape-shaped piece of paper is fixed, stretched vertically, and broken by the weight of the paper itself. In addition, the non-compressive strength is compared with the compressive strength of 100 g/paper in order to compare the properties of paper. Converted to strength, it represents the maximum compressive force that paper can withstand without being destroyed. Meanwhile, bursting strength represents the basic strength of flexible flat materials such as paper, cardboard, and corrugated cardboard. Bursting strength means the maximum resistance when pressure is applied from multiple directions simultaneously and when the paper is burst due to pressure acting perpendicularly from the plane of the paper. The section length graph (a), the incompressible strength graph (b), and the bursting strength graph (c) show the results by target basis weight (120, 150, 180) when the proportions of pulp, rice, and rice husk are 50%, 25%, and 25%, respectively, when the proportions of pulp and rice are 70%, 30%, and when the pulp is 100%.

Here, referring to the section length graph (a), the incompressible strength graph (b), and the bursting strength graph (c), it can be confirmed that when the proportions of pulp, rice, and rice husk are 50%, 25%, and 25%, respectively, and when the proportions of pulp and rice are 70% and 30%, respectively, a loss occurs compared to the case where the pulp is 100%. However, as shown in the section length graph (a), when rice husk is included, the section length can be secured due to the tensile properties of the rice husk. In addition, referring to the incompressible strength graph (b) and the bursting strength graph (c), the incompressible strength and bursting strength can be satisfied due to the stiffness of the rice.

That is, when manufacturing paper including rice and rice husk, no separate chemical treatment is required on the surface, and the rigidity and elongation are secured, so that it can be recycled and used for multiple purposes. Therefore, by adjusting the mixing ratio and basis weight of rice, rice husk, and pulp, it is possible to utilize it as paper-based packaging materials such as delivery boxes/item boxes, and other general paper.

The above description of the present invention is for illustrative purposes, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing the technical idea or essential characteristics of the present invention. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. For example, each component described as a single component may be implemented in a distributed manner, and likewise, components described as distributed may be implemented in a combined manner.

The scope of the present invention is indicated by the claims set forth below, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

Claims (13)

a) Step of grinding rice and rice husk;
b) a step of preparing a composition by mixing rice powder, rice husk powder, pulp and a strength enhancer; and
c) A method for manufacturing paper, comprising the steps of dehydrating, pressing and drying the manufactured composition.
In the first paragraph,
A paper manufacturing method, wherein, in step b), the rice powder is mixed at a ratio of 20 to 30%, the rice husk powder is mixed at a ratio of 20 to 30%, the pulp is mixed at a ratio of 40 to 60%, and the strength enhancer is mixed at a ratio of 0.5 to 1%.
In the first paragraph,
A paper manufacturing method, wherein, in step b), the rice powder is mixed in a ratio of 20 to 40%, the pulp is mixed in a ratio of 40 to 60%, and the strength enhancer is mixed in a ratio of 0.5 to 1%.
In the first paragraph,
A paper manufacturing method, wherein in the step a), the rice powder is ground to a size of 250 to 300 mesh.
In the first paragraph,
A paper manufacturing method, wherein in the step a), the grinding temperature of the rice powder and the rice husk powder is set to 40 to 50 degrees.
In the first paragraph,
A paper manufacturing method wherein the above strength enhancing agent comprises c-pam (cationic polyacrylamide), which is a water-soluble polymer electrolyte.
Paper manufactured by any one of the methods of claims 1 to 6.
Paper manufactured based on a composition produced by mixing rice powder, rice husk powder, pulp and strength enhancer.
In Article 8,
A paper wherein the composition produced is mixed in a ratio of 20 to 30% of the rice powder, 20 to 30% of the rice husk powder, 40 to 60% of the pulp, and 0.5 to 1% of the strength enhancer.
In Article 8,
The above composition produced
A paper wherein the composition produced is mixed in a ratio of 20 to 40% of the rice powder, 40 to 60% of the pulp, and 0.5 to 1% of the strength enhancer.
In Article 8,
The above rice powder is ground into a paper having a size of 250 to 300 mesh.
In Article 8,
A paper wherein the grinding temperature of the above rice powder and the above rice husk powder is set to 40 to 50 degrees.
In the first paragraph,
A paper wherein the above strength enhancing agent comprises c-pam (cationic polyacrylamide), which is a water-soluble polymer electrolyte.

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