KR101999929B1 - Method for manufacturing a high-bulk bio-pad and high-bulk bio-pad manufactured by the same - Google Patents

Abstract

The present invention relates to a manufacturing method of high bulk bio pad which is made of eco-friendly plant fibers such as wood pulp, recycled paper, biomass fibers to be used as disposable absorbent pads, absorbent cores, buffer packaging materials, filter materials and the like, and to a high bulk bio pad manufactured thereby, and more specifically, to a manufacturing method of high bulk bio pad, which includes a step of mixing a solvent having lower polarity than water during a sheet type molding process of fiber materials dispersed in water in a production process of a bio pad to mold the same together, thereby bringing an increase in bulk and enhancement in shock absorption, insulation and absorbent properties, and to high bulk bio pad manufactured thereby. According to the present invention, the manufacturing method of high bulk bio pad comprises the steps of: mixing raw material fibers in water to dissociate the same; pressing and dehydrating the dissociated raw material fibers; and supplying a raw material fiber solid separated by being pressed and dehydrated to a molding device where a low polarity solvent and water are mixed, and de-liquifying a stock solution manufactured by mixing the raw material fiber solid, the low polarity solvent and water by the molding device to mold a bio pad.

Description

[0001] The present invention relates to a method of manufacturing a high-bulk bio-pad and a high-bulk bio-

The present invention relates to a method for manufacturing a high-bulk biopad made of eco-friendly plant fiber such as wood pulp, recycled paper, biomass fiber and the like, which can be utilized as a disposable absorbent pad, an absorbent core, a cushioning packing material, a filter material, More particularly, the present invention relates to a bulk bio-pad, and more particularly, to a method of manufacturing a biodegradable bio-pad by mixing and forming a solvent having a polarity lower than that of water during the process of forming a sheet- A method of manufacturing a high-bulk biopad in which heat insulation and absorbability are increased, and a high-bulk biopade produced thereby.

Due to recent interest in the environment and increasing importance of preservation, restrictions on the use of degradable plastic products and related regulations have become more and more demanding for environmentally friendly biomass-based materials.

Especially, the disposable products which are used for various purposes are being expanded and used more recently due to the expansion of the social atmosphere where the personalized culture is universalized and convenience is emphasized. As a result, the management and disposal of consumable waste such as disposable products, which are continuously increasing, are becoming a major social problem. As a representative countermeasure, development and dissemination of eco-friendly disposable materials having excellent recyclability and biodegradability have been developed, .

Paper and pulp molds made from wood pulp or recycled paper or biomass fiber are produced through mass production of wet molding base, which is a typical eco-friendly material. Therefore, it is economical, has excellent recyclability, easily biodegrades in nature Has excellent advantages. Various additive materials and processing methods have been continuously developed to provide additional functionality. For example, various applications such as coating, laminating and multilayering methods have been used for applications. In the future, it is becoming more and more popular as a major eco-friendly material that can be applied to various applications such as packaging materials, disposable household goods, and filter materials in place of existing plastic materials.

In addition, demand for products based on environmentally friendly materials is continuously increasing in various disposable hygiene products such as diapers, sanitary mats and disposable absorbent mats, and sheet biopads can be applied to the absorbent core of disposable sanitary articles Because of this, interest and demand are continuously increasing.

As an eco-friendly material, for sheet biopads, bulk is a very important quality characteristic that has an important impact on both quality and usability. The function of the biopad as a product, such as buffering property, heat insulating property, stiffness, absorbability, etc., is greatly influenced by the bulk.

 In paper products, bulk is a very important quality characteristic, and various techniques for improving such bulk are continuously being developed. Examples of such techniques are described in documents 1 to 6 below.

Patent Document 1 discloses a method for separating pulp fibers from a pulp fiber, comprising a dissolving step of diluting the pulp fiber with water, a cleansing step of removing impurities contained in the pulp fiber after the dissolving step, and a cleansing step of softening the pulp fiber after the cleansing step ; A second step of mixing the pulp fiber obtained in the first step with a powdery organic additive composed of at least one selected from wood powder, beer, palm leaf, palm stem, Empty Fruit Bunch (EFB), rice hull, Wherein the powdery organic additive is prepared by sequentially introducing a cationic polymer electrolyte and an anionic polyelectrolyte so as to modify the surface of the polymer electrolyte with a multi-layered polymer electrolyte so as to increase the binding force with the pulp fiber, A method of improving the bulk and strength of a paperboard using the powdery organic additive is disclosed.

Patent Document 2 discloses a method for producing a paperboard by forming, laminating, compression-dehydrating, drying, processing and glossing a pulp raw material in a paper machine for paper making, Perlite) in an amount of 1 to 10% by weight based on the total weight of the paper.

Patent Document 3 (1) discloses a method for producing a calcium carbonate dilute solution, comprising the steps of: (1) diluting calcium carbonate with water to prepare a diluted calcium carbonate solution; (2) adding an ionic polymer to the calcium carbonate diluent prepared in the step (1) and stirring to form a pre-aggregate; And (3) introducing a calcium compound and carbon dioxide into the dilute solution in which the pre-agglomerates are formed in the step (2), thereby coating the pre-agglomerates of calcium carbonate with a calcium compound. have.

In the case of Patent Documents 2 and 3 described above, the method of bringing bulk improvement of about 10% in tributary products which are not high in bulk through high-compression dehydration process after forming paper is suitable for producing high-bulk biopad products And the bulk enhancement effect is relatively limited.

Patent Document 4 discloses a method for producing pulp; Mixing an organic solution comprising a woody organic filler having a fiber length of 0.3 to 0.5 mm into said pulp stock; And a step of adding a polymer material to the pulp raw material mixed with the organic solution to prepare a raw material for a cardboard.

In Patent Document 5, nanofibrillated cellulose (NFC) having a width of 1 to 300 nm and a length / width ratio of 10 to 1,000 and being diluted in water is prepared, Preparing a mixture (step 1) by mixing a calcium compound at a weight ratio of 1: 1 to 1:70 with respect to the celluloses; And a step (step 2) of injecting carbon dioxide into the mixture prepared in step 1 under a temperature condition of 10 to 80 占 폚.

In the case of Patent Documents 4 and 5, as a method for improving the bulk of a paper product through the application of various additives, the type and amount of additive that can be applied to processes and other quality influences are limited, And the improvement effect is insufficient.

Patent Document 6 discloses a method of manufacturing a semiconductor device, which includes (a) a first permeable outer layer, (b) an intermediate layer, and (c) a permeable second outer layer, wherein the intermediate layer is located between the first and second outer layers, 1 or the second outer layer, wherein the intermediate layer comprises a bulkiness greater than the bulkiness of the first or second outer layer, and wherein the intermediate layer comprises a non-creped vented dried tissue A modified wet tissue or absorbent foam having a wrinkle-like structure, wherein at least one outer layer is creped during manufacture of the composite tissue structure.

In the case of Patent Document 6, a bulking agent or the like is used as a chemical treatment technique. The bulking agent has both hydrophobic and hydrophilic groups, so that the hydrophilic group binds to the fiber surface and the hydrophobic group binds to the outer surface to interfere with the interfiber hydrogen bonding to increase the thickness. In the case of the bulking agent, various process troubles such as foam generation in the paper manufacturing process can be brought about due to the characteristics of the surfactant, and thus the application is limited.

 Techniques developed up to now have been made by methods of enhancing bulk by applying various additives or additives. Due to limitations in applicability and quality of the manufacturing process, there is a limit in the application amount of these additives or additives, . ≪ / RTI >

Korean Registered Patent No. 10-1470738 (registered on December 02, 2014) Korean Registered Patent No. 10-0954846 (Registered on April 19, 2010) Korean Registered Patent No. 10-1742962 (Registered on May 29, 2017) Korean Registered Patent No. 10-1360923 (Registered on April 4, 2014) Korean Registered Patent No. 10-1535522 (Registered on July 3, 2015) Korean Registered Patent No. 10-0909010 (Registered on July 16, 2009)

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made in order to solve the above problems, and it is an object of the present invention to minimize the shrinkage and condensation of the fiber itself by water by molding, dehydrating and drying the biopad under the condition of a low polarity solvent, The present invention also provides a method for manufacturing a high-bulk biopad that can greatly improve the bulk of a product by reducing water adhered to the fibers and reducing the adherence of fibers to the fibers.

In order to accomplish the above object, a method of manufacturing a high-bulk biopad according to the present invention comprises the steps of mixing raw fibers and dissolving them in water; Compressing and dewatering the dissociated raw fiber; And a pressurized dewatered raw fiber solid material is supplied to a molding apparatus containing a mixture of a low-polarity solvent and water, and the material liquid produced by mixing the raw fiber solid material, the low-polarity solvent and water is desorbed by the molding apparatus, And molding the pad.

The raw material fiber may be any one selected from the group consisting of wood fiber, recycled wastepaper fiber, wood fiber, cotton fiber, high purity cellulose fiber, herbaceous biomass fiber and natural fiber.

Further, in the step of forming the biopad, the biofilm is formed on the net by dewatering or vacuum absorbing the ground liquid with a mesh having a predetermined size.

The low polarity solvent may be any one selected from the group consisting of ethyl alcohol, acetone, ethyl acetate (EA) and isopropanol (IPA).

Further, after the step of molding the biopad, the method further comprises a step of passing the biopad formed by the molding device through a pair of rolls and squeezing and dewatering.

The method may further include a solvent drying step of drying the low polarity solvent contained in the biopath that has passed through the roll after the step of compressing and dewatering the biopad.

In addition, the vapor discharged during drying in the solvent drying step is collected, condensed, and re-introduced into the molding apparatus.

Further, the method further includes a moisture drying step for drying the solvent after the solvent drying step to remove moisture remaining in the bio-pad after the solvent drying step.

In addition, the step of molding the biopad, the step of compressing and dewatering the biopad, and the step of drying the solvent are performed in a process chamber in which the inside is kept in a reduced pressure state in order to minimize divergence of the low polarity solvent.

The high bulk biopad according to the present invention is characterized in that it is produced by the above production method.

As described above, the method of manufacturing a high-bulk biopad according to the present invention and the high-bulk biopad produced by the method of the present invention use a low-polarity solvent having relatively low polarity together with water during the formation of the biopad, In the mixed state of water, the biopad is formed and dewatered to perform primary drying and secondary drying, thereby minimizing shrinkage and condensation of the fiber pores caused by dehydration and drying of highly polar water, Thereby reducing the adhesion between the fibers caused by the pulling force, thereby greatly improving the bulk of the product.

In addition, in the present method, the solvent which is dehydrated after molding is recycled to the molding apparatus, and the evaporation solvent by the primary drying is also condensed and reused to minimize the loss of the low-polarity solvent which is higher in price than water, A closed process in which a rool and a primary drying device are cut off to a process chamber in which the inside is decompressed is constructed so as to minimize the diffusion of the solvent into the process and increase the recovery and reuse efficiency of the solvent to be evaporated have.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process diagram showing a method for producing a high-bulk biopad according to the present invention. FIG.
2 is a schematic view showing an apparatus for manufacturing a high bulk biopad according to the present invention.
3 is a graph showing changes in bulk of a molded product of a bio pad according to an alcohol mixing ratio of mixed solvents.
FIG. 4 is a graph showing a change in dehydration property of the mixed solvent when the bio-pad is molded according to the alcohol mixing ratio. FIG.
FIGS. 5 and 6 are graphs showing changes in drying rate during the manufacture of a bio pad according to the alcohol mixing ratio of mixed solvents. FIG.
7 is a graph showing the evaluation of the heat insulating property of the biopath according to the alcohol mixing ratio of the mixed solvent.
8 is a graph showing a change in the maximum water absorption amount of the biopath according to the alcohol mixing ratio of the mixed solvent.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, a method of manufacturing a high-bulk biopad according to the present invention includes: (S100) mixing and disassembling raw fiber into water; Squeezing and dewatering the dissociated raw fibers (S200); And a pressurized dewatered raw fiber solid material is supplied to a molding apparatus containing a mixture of a low-polarity solvent and water, and the material liquid produced by mixing the raw fiber solid material, the low-polarity solvent and water is desorbed by the molding apparatus, And molding the pad (S300).

Vegetable fibers, such as wood pulp, recycled paper, and biomass fibers, are usually made up of cellulosic cell walls. Cellulose is a linear polymeric substance in which glucose per 6 carbon is formed through beta-glucosidic bonding. Three hydroxyl groups are present in glucose as a unit and hydrophilic due to the presence of such a large number of hydroxyl groups.

In the manufacturing process of paper and pulp molds made from raw materials such as wood pulp, recycled paper, and biomass fiber, the raw materials are dissociated in water to form a paper stock, and the paper is formed by the fibers of the paper stocks. And the plate-like structure is formed through the process. At this time, the hydroxyl groups (-OH) present in cellulose and hemicellulose, which are main components of the raw fiber, easily bind to polar water, and the raw fibers exist in a state of being hydrated and swollen in water. Removed.

As the polarity of water in the formed wetland pills escapes, the pulp fibers of the pulp fibers or the biomass fibers of the cellulose that constitutes the biomass fibers are pulled, thereby removing the water through the dehydration and drying process so that the fibers gradually come into contact with each other Ultimately, hydroxyl groups of each fiber are hydrogen bonded to form a rigid structure. In addition, as the swollen pulp fibers or the water in the pores inside the biomass fibers are also released, the hydroxyl groups of the internal pores are brought into close contact with each other, and the fibers are shrunk and the voids in the fibers are largely removed.

Paper products and pulp molds made of such materials as wood pulp, recycled paper, biomass fiber, etc., due to the action of water having such a strong polarity, have a strongly bonded structure and quality even when no additional adhesive is applied in the manufacture of the product. The Polarity Index of water is 9.0, which is very high polarity. Therefore, the hydroxyl groups of the fibers are attracted to each other. Ethanol (polarity index: 5.2), acetone (polarity index: 5.1) (Polarity index: 4.4) and isopropanol (polarity index: 3.9), the strength of pulling the hydroxyl group is relatively weak.

Accordingly, the present invention utilizes a low-polarity solvent having a relatively low polarity as a solvent in mixing fibers with water. In particular, by performing primary drying and secondary drying by molding and dewatering the biopad in a mixed state of a low-polarity solvent and water, shrinkage and condensation of the fiber itself due to water drop-off in the fiber are minimized, The bulk of the product can be greatly improved by reducing the hepatic adhesion.

In the present method, the solvent to be dewatered after molding is recycled as a solvent of the supporting material in a molding machine, and the evaporation solvent by primary drying at 80 ° C or less is also condensed and reused to produce a low-polarity solvent In addition to minimizing the loss, it is also possible to minimize the diffusion of the solvent in the process by constructing a closed process in which the molding apparatus, the rool and the first drying apparatus are shut off to a process chamber in which the inside is reduced, Thereby increasing the recovery and reuse efficiency of the evaporated solvent.

First, in step S100 where the raw fiber is mixed with water and dissociated, the raw fiber is dissociated in water using a dissolver, and if necessary, the fiber is cut or pressed using a beater (beating treatment) .

In order to facilitate mixing of the raw fiber and water, the dissociation concentration is preferably about 0.5 to 3%.

The raw material fiber is made of any one selected from the group consisting of wood fiber, recycled woven fiber, wood fiber, cotton fiber, high purity cellulose fiber, herbaceous biomass fiber, and natural fiber.

In the step of mixing and dissolving the raw-material fibers in water, a screen and a cleaner process for removing the raw-fiber impurities can be performed.

That is, fiber raw materials containing impurities that are not usable are not suitable for producing high-quality biopads, and therefore unnecessary impurities are removed through a process such as a screen and a cleaner process.

In the step S200 of compressing and dewatering the dissociated raw fiber, the dissociated raw fiber is squeezed and dewatered to separate the raw fiber solid and water.

In this process, the separated water is used for dissociating the raw fiber in the step of mixing and dissolving the raw fiber described above in water.

In the step of compressing and dewatering the dissociated raw fibers, the dissociated raw fibers are squeezed and dewatered until the moisture becomes 15 to 20%.

As a device for squeezing and dewatering the raw fiber, a compactor, a decanter, a screw press, or the like can be used.

In step S300 of forming the bio pad, the raw material fiber material separated by the squeeze-dewatering process is supplied to a molding apparatus 100 containing a mixture of a low-polarity solvent and water, and the raw material fiber solid, The biodegradable layer is dewatered by mixing the solvent and water to form a biopad.

At this time, the ground solution is naturally dewatered or absorbed by a mesh of a certain size to form a biopad on the mesh.

It is preferable that the molding apparatus 100 is configured as a circular knitting machine, but the present invention is not limited thereto, and various methods such as circular, rectangular, and mold shapes can be applied.

The low polarity solvent is composed of any one selected from the group consisting of ethyl alcohol, acetone, ethyl acetate (EA) and isopropanol (IPA).

The mixing ratio of the water and the low polarity solvent is 30:70 or 70:30, preferably 50:50.

Particularly, the concentration of the stock solution in the molding apparatus is preferably about 0.5 to 2% by weight. The reason is that if the concentration of the stock solution exceeds the above-mentioned range, the fibers in the stock solution are entangled and the quality variation during molding is large and the structure of the product becomes uneven.

The low-polarity solvent has a polarity lower than that of water and has a relatively weak pulling force for hydroxyl groups, thereby reducing the interfiber adhesion and minimizing the shrinkage and condensation of the fiber itself, thereby greatly improving the bulk of the product.

As shown in FIG. 2, the raw fiber solid material is supplied to a circulation tank through a pipe, mixed with a low-polarity solvent and water contained in the circulation tank, and the ground liquid is prepared by mixing the raw water and the water. The prepared stock solution is uniformly spread through the net of the spinneret and dehydrated to form the biopad.

Although not shown in the figure, the ventilator performs a suction function to remove moisture contained in the bio pad.

After the step of forming the bio pad (S300), a step of pressing and dehydrating the biopads formed by the molding device through the pair of rolls (400) is further included. The roll 200 may be a couch roll or a squeeze roll, and may be substituted for the same purpose and effect.

At this time, in the process of squeezing and dewatering the biopad, the separated water and the low-polarity solvent are re-introduced into the molding machine, and when the concentration of the low-polarity solvent contained in the molding machine is insufficient, Lt; / RTI >

On the other hand, the water and the low-polarity solvent, which are separated during the molding process by the molding apparatus, are discharged into the molding apparatus and continuously supplemented.

The method further includes a solvent drying step (S500) of drying the low polarity solvent contained in the biopath that has passed through the roll (200) after the step of pressing and dewatering the biopad (S400).

The solvent drying step may be carried out at a temperature of 80 DEG C or below in the case of a low polarity solvent such as ethyl alcohol (boiling point: 78 DEG C), acetone (56 DEG C), ethyl acetate (77 DEG C), or isopropanol Dried in the first drying apparatus 300 to be maintained.

The present invention includes collecting the vapor discharged during drying in the solvent drying step, condensing it, and re-introducing it into the molding apparatus. This is to increase the recovery and reuse efficiency of the solvent evaporated during the first drying.

Meanwhile, in the step of forming the biopad, the step of compressing and dewatering the biopad, and the step of drying the solvent, a process is performed in a process chamber 500 in which the inside is kept in a reduced pressure state in order to minimize divergence of the low polarity solvent.

Therefore, it is possible to prevent the pollution of the working environment in the process due to the volatilization of the low-polarity solvent continuously in the step of forming the biopad, the step of dehydrating the biopath by the roll, and the step of drying the solvent, It prevents cost increase due to solvent loss. To this end, the molding apparatus, the rool and the first drying apparatus are covered with a process chamber whose interior is in a reduced pressure state, thereby minimizing the diffusion of the low-polarity solvent to the outside.

After the solvent drying step (S600), a moisture drying step (S600) is performed to dry the remaining bio-pads after the solvent drying step to remove moisture.

The moisture drying step is performed in a second drying apparatus 400 maintained at a temperature of 100 ° C or more to remove moisture remaining in the bio pad. And the moisture remaining in the bio pad is removed through the moisture drying step to produce a high-bulk bio-pad.

The first drying apparatus 300 and the second drying apparatus 400 may include a mesh belt or a porous mat having a plurality of holes and a heat supply device for supplying heat. As the heat supply device, a microwave, an infrared lamp, a heater, a hot wire, or the like is used, and the device can be substituted for the same purpose and effect.

The biopads produced through the first drying device and the second drying device are cut to a certain size through a cutter.

Hereinafter, the present invention will be described in more detail by way of examples. However, the following examples are illustrative of the present invention, and the present invention is not limited to the following examples.

Example 1: Mixed solvent-based biopad manufacture

In order to evaluate the change of biopad structure characteristics according to the solvent blending conditions in the application of mixed solvent of water and ethyl alcohol, bleached hardwood bleached pulp (BKP) used in various paper products, pulp mold and absorbent core product was dissociated in water, (CSF) of 600 mL was used in this example.

The mixed solvent used in this example was ethanol and water mixed with each other. The volume ratio of ethanol to be mixed was 25%, 50%, and 75%, respectively. The bio-pads were formed with a standard basis weight of about 250 to 300 g / , Followed by dehydration, followed by primary drying and secondary drying. After that, the manufactured biopads were subjected to constant temperature and humidity treatment, and their thickness was measured using a thickness meter to evaluate the bulk characteristics.

As shown in FIG. 3, it was confirmed that the bulk of the pad structure was increased as the content of ethanol in the mixed solvent was increased. The broad-leaved bleached pulp used in the manufacture of biopads is highly hydrophilic due to the removal of most of the lignin and consists of cellulose and hemicellulose. Unlike the conventional water-based method, in the case of a biopath manufactured in a molding apparatus in which a low-polarity ethanol is mixed, the densification phenomenon caused by dehydration and evaporation of water in the dehydration and drying process is reduced, It was confirmed that it exhibited a highly increased bulk property.

The rate of dehydration of the bio - pad was investigated according to the mixing ratio of alcohol in the mixed solvent. After the vacuum molding and vacuum dehydration, the solid content of the biopad was evaluated and the effect of the alcohol mixing ratio was investigated.

As shown in FIG. 4, the larger the mixing ratio of alcohol is, the lower the dewatering characteristic in the vacuum dewatering process becomes.

Test Example 1: Drying rate change in a mixed solvent-based biopad manufacturing process

The drying speed of the bio-pads that were quenched after molding was evaluated in the same manner as in Example 1, which is shown in Figs. 5 and 6. After the Kuching wet paper pellets were cut to 1 cm x 1 cm, moisture content was measured at the final drying rate and time according to the mixing ratio of ethanol in the same manner as in Example 1 by using a water content meter. When the moisture content before drying was taken as 100%, drying at 80 ° C was performed, and the drying rate of the mixed solvent was evaluated at the end point where no further solvent evaporation occurred at 80 ° C.

As the amount of ethanol was increased, the final drying time was shortened and the water removal rate was also high. In the case of ethanol having a boiling point of 78 ° C, the drying time was greatly reduced by rapid evaporation.

Test Example 2: Changes in physical properties of the mixed solvent-based biopads manufactured

In order to evaluate the heat insulating properties of the biopads prepared in Example 1, the thermal conductivity and the maximum water absorption of the samples prepared under the respective conditions were evaluated.

The thermal conductivity of each sample was evaluated by the degree of heat transfer from the hot plate to the surface of the sample after the sample was adhered to the heat plate capable of temperature control. The temperature of the hot plate was adjusted to 100 ° C and 200 ° C respectively, and the temperature of the surface was measured after a lapse of a predetermined time (1 minute) after the sample was adhered to the hot plate.

As shown in FIG. 7, it was confirmed that as the ratio of ethanol in the mixed solvent increases, the adiabatic effect increases and the surface temperature of the sample decreases. It was confirmed that these characteristics are more evident especially when the temperature of the heat plate is high. These results show that as the ratio of ethanol in the mixed solvent increases, the bulk increases and the adiabatic characteristic increases as the voids in the structure are generated more.

  The maximum water uptake of each biopad sample was measured by cutting the biopad specimen to 2 cm x 2 cm size, immersing it in distilled water for 30 seconds, removing gravity water, and measuring the total weight of the absorbed water. The maximum water uptake was shown by the ratio of the amount of water absorbed per specimen weight.

As shown in FIG. 8, it was confirmed that the maximum water uptake increases as the ratio of ethanol in the mixed solvent increases. As a result of the same effect as the adiabatic property, the bulk increases as the ratio of ethanol in the mixed solvent increases, and the adiabatic characteristic increases as the pores in the structure are generated more.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many obvious changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention should therefore be construed in light of the claims set forth to cover many of such variations.

100: Molding device
200: roll
300: First drying device
400: Second drying device
500: process chamber

Claims (10)

Mixing and dissolving the raw fibers in water;
Compressing and dewatering the dissociated raw fiber; And
The raw material fiber solid material separated by compression and dewatering is supplied to a molding apparatus containing a mixture of a low-polarity solvent and water, and the stock solution produced by mixing raw fiber solid, low-polarity solvent and water is desorbed by the molding apparatus, , The method comprising:
Wherein the forming of the biopad is performed in a process chamber where the interior of the biopath is maintained in a reduced pressure state in order to minimize divergence of the low polarity solvent.
The method according to claim 1,
Wherein the raw material fiber is one selected from the group consisting of wood fiber, recycled wastepaper fiber, wood fiber, cotton fiber, high purity cellulose fiber, herbaceous biomass fiber, and natural fiber.
The method according to claim 1,
Wherein the forming of the bio pad comprises forming a bio pad on the net by dewatering or vacuum absorbing the ground liquid with a mesh of a predetermined size.
The method according to claim 1,
Wherein the low polarity solvent is any one selected from the group consisting of ethyl alcohol, acetone, ethyl acetate (EA), and isopropanol (IPA).
The method according to claim 1,
Further comprising the step of compressing and dewatering the biopads formed by the molding device through a pair of rolls after the step of forming the biopads.
The method of claim 5,
Further comprising a solvent drying step of drying a low polarity solvent contained in the biopath that has passed through the roll after the step of compressing and dewatering the biopad.
The method of claim 6,
Wherein the vapor discharged during drying in the solvent drying step is collected, and the vapor is condensed and re-introduced into the molding apparatus.
The method of claim 6,
Further comprising a moisture drying step for removing moisture remaining in the bio-pad after the solvent drying step after the solvent drying step.
The method of claim 6,
Wherein the step of compressing and dewatering the biopad and the step of drying the solvent are performed in a process chamber in which the inside is kept in a reduced pressure state in order to minimize divergence of the low polarity solvent.
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