KR100694293B1 - vacuum formation method of fine particled pulp and its apparatus - Google Patents

Abstract

The present invention is to finely pulverize the pulp obtained from waste paper, wood, etc. obtained by using a general dissociator, etc., to obtain fine powder, and to use a fine powder pulp to form a pulp mold by a dry method using the fine powder pulp. It relates to a vacuum forming method and apparatus.

To this end, the present invention is finely pulverized pulp obtained by a conventional method to obtain a fine powder mixed with an adhesive for the manufacture of pulp mold to obtain a fine powder mixed pulp, the fine powder mixed pulp is lower storage chamber 14 by a predetermined amount ) To flow in a floating state by the blowing fan 12 in the form of a mixture with air, and then the plunger 7 is lowered to allow the upper chamber 2 and the lower storage chamber 14 to mutually flow. After the flow through the vacuum and the pressure port (1) to reduce the vacuum rapidly so that the fine powder mixed pulp flowing in the lower storage chamber 14 is absorbed and attached to the upper mold (3) having micropores by vacuum. Then, the lower mold 5 is inserted into the upper chamber 2 and the powdered pulp lamination layer attached to the upper mold 3 is heated and compressed by raising the plunger 7 to form a dense pulp mold. , Vacuum and Pressurized air (1) is supplied to supply pressurized air to separate the molded body from the upper mold (3) and place it in the lower mold (5), and the lower mold (5) with the lowering of the plunger (7) opens the entrance (8). The present invention relates to a vacuum molding method and apparatus for fine powder pulp characterized by suggesting a molding method to exit through the upper chamber (2).

Fine powder pulp, fine powder mixed pulp, upper chamber, lower storage chamber, blower fan, plunger, vacuum and pressurizing port, vacuum forming, heating pressurization, humidification and pressurizing port, release separation

Description

Vacuum formation method of fine particled pulp and its apparatus}

1 is a partially cutaway perspective view of the molding apparatus of the present invention;

Figure 2 is an exemplary view during the vacuum forming process of the molding apparatus of the present invention, a) is a pulp mixture conveying and vacuum adsorption process, b) the press molding and drying process of the lower mold after drying, c) the mold release (離 型) ), The pulp mold discharging step is shown.

Design 3 is a process flow chart,

4 is a shape of a mixed pulp consisting of pulp and starch additives.

5 and 6 is the shape of the pulp mold molded in the present invention

<Explanation of symbols for main parts of drawing>

1: vacuum and pressure port 2: upper chamber

3: upper die mold 4: humidification and pressurization

5: lower mold 7: plunger

8: Outlet 11: Mixing pulp supply passage

12: blower fan 14: lower storage chamber

The present invention finely pulverizes the pulp obtained from waste paper, wood, etc. obtained by using a general dissociator and the like to obtain fine powder, and vacuum molding of the fine powder pulp to form a pulp mold by a dry method using the fine powder pulp. A method and apparatus are disclosed.

Generally, the type of pulp mold is divided into two types according to the manufacturing process. The pulp mold is largely divided into vacuum dehydration and press dehydration, and vacuum dehydration is divided into soft mold by a rotary machine and hard mold by a press machine. Soft molds are often referred to as wet pulp molds and hard molds are called dry pulp molds.

Wet pulp mold refers to a method in which a mold is formed into a mold and then naturally dried while moving through a line. Due to its excellent ventilation, its surface is not smooth. It is mainly used for egg trays and agricultural products.

On the other hand, dry pulp molds are manufactured after wet, and can be formed by forming any shape according to the shape of the mold. Therefore, dry pulp molds are manufactured in various industrial product packaging buffers, information and communication device buffers, food containers, fruit trays, etc. Used for the purpose. The surface is smooth and smooth, which increases the value of the product, has a cushioning property, and has the characteristic of having a seamless three-dimensional structure by molding through a mold. Due to these characteristics, dry pulp mold has emerged as a target for development by many researchers, and its use is expanding.

As is already known, pulp mold has the advantage of high eco-friendliness that can be recycled, so the demand for packaging materials in developed countries such as Europe is increasing rapidly.

In general, the method of manufacturing pulp mold is disperse and disperse in a stirred tank by adding water of about 50-120 times to the pulp raw material, both wet and dry, and then inhaling or spraying the pulp liquid in the dough state using a mold with an STS network. It is prepared by dispersing by means of pulps to attach the pulp, detaching it from the gold screen, warming and pressing in a mold of a certain shape, and drying it again in hot air.

The wet dissociation method using water as described above requires enormous amounts of water and requires a large amount of space such as an agitator tank and a storage tank, and thus requires a lot of space, and the equipment cost of the equipment is also very large. Since the addition of preservatives and the like is necessary for the prevention of such wastes, wastewater generation cannot be avoided, and the treatment is also a major problem. In addition, the manufacturing process is slow due to the complicated process and several steps are required for the transfer and molding of the pulp liquid, and the price of the equipment is very high, which acts as a factor in the cost of manufacturing the pulp mold. There are still a lot of problems.

Another method is to make a dough state by mixing with a large amount of caking agent and press molding, or to form the plate in advance and then secondly molding the plate in a molding mold, but in the case of using the dough state, the mold release after molding If the product is dried, the deformation and cracks of the molded body are severe, and in order to prevent this, there is a disadvantage in that the drying time is maintained for 30 minutes or more. Meanwhile, the plate is manufactured in advance and subjected to secondary processing for packaging. Even in the case of manufacturing a container or the like, a large amount of thermoplastic synthetic resin system, which may be a problem to the environment, or a semi-dry state in which much residual moisture is left must be maintained. In addition, both of the above dry forming methods, such as the use of dough and the preforming methods such as sheet molding, produce a pulp mold having a complicated shape, so that a large amount of cracks and breakages occur. .

Therefore, in the present invention, in order to improve the above disadvantages, fine powder pulp is obtained by finely pulverizing various types of pulp obtained by using a conventional dry paper dissociation, etc. The pulp is obtained, and the dried fine powder mixed pulp is suspended and transported by air to be attached to a mold by a vacuum apparatus without using any wet medium such as water, and then pressurized and heated using another mold to pulp. A method and apparatus for manufacturing a mold are proposed.

The present invention relates to a new pulp mold manufacturing process that can completely solve the various disadvantages of the conventional pulp mold manufacturing method, to obtain a fine powder pulp dry using a grinder without using water, the fine pulp Depending on the application, various kinds of adhesives are dry mixed, and then the powder mixture is moved to air, attached to a mold by using a vacuum method, and then vacuum-molded and processed by vacuum heating. It is.

In addition, the manufacturing process of the powdered pulp mold is a new type of dry pulp mold manufacturing technology that uses little water, unlike the conventional dry pulp mold forming process, and is a completely eco-friendly process with no generation of waste water. Since the medium does not use water at all, almost no drying process is required, so the energy efficiency is high and the compact equipment space is possible, and the production efficiency is excellent and the production cost can be reduced. It is intended to provide a pulp molding process method that has the advantages of excellent thickness control and dimensional stability of the product by supplying and molding only a predetermined amount per unit process each time to obtain a dry pulp mold with excellent commercial properties.

The present invention relates to a pulp mold in which a pulp obtained from general waste paper, wood, and the like is finely pulverized to obtain fine powder, and the pulp mold is formed by a dry method using the fine powder pulp. Drying of the adhesive for the production is sufficiently mixed to obtain a fine powder mixing pulp, the fine powder mixing pulp using the apparatus of Figure 1 and the operation step of the molding apparatus is the same as Figure 2 and describes the configuration and overall process of the apparatus It looks like this:

Referring to the configuration of the vacuum forming apparatus of the fine powder pulp of Figure 1, the fine powder mixed pulp is stored in the lower storage chamber 14 by a predetermined amount is suspended by the blowing fan 12 in the form of a mixture with air While continuing to flow in a closed state, the plunger 7 is lowered to allow the upper chamber 2 and the lower storage chamber 14 to be connected to each other, and then the pressure is reduced through the vacuum and the pressure port 1 to the vacuum state. An apparatus having a function of mixing the water vapor through the humidification and the pressurization port 4 while allowing the fine powder mixed pulp that flowed in the storage chamber 14 to be vacuum-absorbed and attached to the upper mold 3 having micropores; ,

The lower mold 5 is moved from the side into the upper chamber 2 and placed on the rising plunger 7 and the upper layer portion of the lower mold 5 warmed by the continuous rise of the plunger 7 is heated. An apparatus having a function of heating and heating the fine powder pulp laminate layer attached to (3) to form a high density pulp mold;

The pulp mold is separated from the upper mold (3) by using the pressurized air through the vacuum and the pressure port (1) to be placed in the lower mold (5), and the lower mold (5) with the lowering of the plunger (7) It is characterized in that it consists of a device having a function of exiting the upper chamber (2) through the entrance (8).

In addition, in the embodiment using the process of Figure 3 using the apparatus of the present invention, Figure 4 is a scanning electron micrograph of the fine powder mixed powder prepared in the present invention,

5 and 6 show the shape of the pulp mold of each embodiment, which will be described in detail for each process as follows.

1st process: Fine powder pulp manufacturing process

It is a process of manufacturing fine powder pulp using the pulp dissociated in the suitable state obtained by using waste paper and a paper feeder using a conventional paper dissociator.

The waste paper cut to a certain size is put into a dry fine grinder, and the rotary speed of the impeller with the cutter blade is operated for 5-30 minutes at a condition of 500-3000 rpm per minute to finely grind the waste paper and the paper to be used for pulp mold production. It is a process of obtaining fine powder pulp.

Second process: manufacturing process of fine powder mixed pulp

This step is a step of obtaining a fine powder mixed powder by mixing the fine powder pulp obtained in the first step with an adhesive such as starch and CMC (carboxy methyl cellulose).

That is, in the case of starch, 0.01-50 g is added to 100 g of the finely divided powder pulp, added to the fine grinder, and mixed uniformly while repulverizing the impeller for 1-20 minutes under the conditions of 500-1000 rpm per minute. The shape of the finely powdered mixed pulp obtained by adding the starch is shown in FIG. 4, which shows that the spherical fine powder is dispersed and attached to the pulp.

In the case of CMC, 1-50 g is added to 100 g of the fine powder pulp, and the mixture is put into the fine grinder and mixed uniformly while repulverizing the impeller for 1-20 minutes under the condition of 500-1000 rpm per minute.

Third Process: Mixed Pulp Transfer and Adsorption Process

This process is shown in Fig. 2 a), and the fine powder suspended in the lower storage container 14 by depressurizing the upper chamber 2 to 0.8-0.2 atmosphere so that the mixture of the fine powder mixed pulp with air flows uniformly. While moving the mixed pulp mixture, water and water are attached to the finely divided powder mixed pulp that is moved by introducing water vapor at a temperature of 80-180 ° C. and a relative humidity of 50-100% through a humidification and pressurization port 4. By rapidly depressurizing to a vacuum state of 0.1-0.001 atm, the humidified fine powder mixed pulp is vacuum-absorbed and attached to the upper mold (3), and then the fine powder mixed pulp adhered is 10- Pressurized again for 1-30 seconds at a pressure of 50 atm to feed the mixed pulp and adsorb the mixed pulp to densify the mixed pulp adhesion layer.

That is, the fine powder mixed pulp mixed with additives can store a mixture of fine powder mixed pulp and air at a constant volume by using air, and a pleating device 10 is attached to the lower storage chamber 14 to change the volume. It is possible to change the volume of the fine powder mixed pulp mixture to control the apparent density, by lowering the plunger 7 is connected to the lower storage chamber 14 and the upper chamber (2), followed by vacuum and pressure port ( It is a process of conveying and adsorbing the mixed pulp so that the fine powder mixed pulp that flowed in the lower storage chamber 14 is vacuum-absorbed and attached to the upper mold 3 having micropores by rapidly depressurizing the vacuum state through 1). .

More specifically, the plunger 7 moves upward through the sealing opening 13 with the O-ring to seal the lower storage chamber 14, and then, using the blowing fan 12, the lower storage chamber 14. After allowing the mixture of the fine powder mixed pulp with air to flow uniformly, the plunger 7 is lowered so that the upper chamber 2 and the lower storage chamber 14 are connected to each other and the pressure inside the upper chamber 2 is reduced. The fine powder mixed pulp mixture suspended in the lower storage container 14 is transferred to the upper chamber 2, and at the same time, the heated and humidified water vapor is introduced through the humidifying and pressing port 4 and attached to the moving powder. Floating powder mixed pulp floating in the upper chamber 2 by rapidly depressurizing the inside of the upper chamber 2 in a vacuum state through the vacuum and the pressurizing opening 1 as possible, and having a micropore Vacuum-absorbed to (3) and attached Adhering the pressure through a fine powder for blending a short period of time at a constant pressure to the seating of the pulp wet and the pressure port 4 and a mixture of pulp feed to the vacuum suction process.

4th process: transfer and press molding process of lower mold

This process is shown in b) of FIG. 2, and the lower mold 5 is moved using the plunger 7 to form the fine powder mixed pulp attached to the upper mold 3 by vacuum adsorption. Using a lower mold (5) having a temperature of 80-180 ° C. at a pressure of -150 atm, and warming and pressurizing for 1-5 minutes, the gas is discharged from the vacuum and the pressure port (1) so as to discharge gas such as steam generated at this time. It is a step of heating and molding the pulp mold by simultaneously performing molding and drying at the same time while maintaining a vacuum state of -0.001 atmosphere.

That is, the lower mold is formed through the entrance 8 having a sealing function against vacuum and pressurization by using the plunger 7 to form the fine powder mixed pulp attached to the upper mold 3 by vacuum adsorption in the third process. The mold 5 is moved on the roller-type pedestal 6 with the moving shaft 9 to rest on the plunger 7 positioned at a constant height in the upper chamber 2, the moving shaft 9 is retracted and the entrance and exit After closing (8), the lower mold (5), which can be heated and pressurized, is pressurized using the plunger (7) to bring it into close contact with the upper mold (3), and the interior between each upper mold (3) and the lower mold (5). The space is enclosed and molded in a state connected only to the vacuum and the pressurization opening (1), wherein the gas such as steam generated is rapidly formed and dried while maintaining the vacuum to be discharged through the vacuum and the pressurization opening (1). Pulp molding process.

5th process: transfer process of mold release and lower mold of pulp mold

This process is shown in c) of FIG. 2, and pressurized air at 5-50 atm through a vacuum and pressurization port (1) to take out the completed pulp mold in the upper mold (3) and the lower mold (5). Blown out of the pulp mold formed from the upper mold (3) to be placed in the lower mold (5), and at the same time lowering the plunger (7), and pulled out through the entrance (8) and placed on the roller-type pedestal (6) After the molding and drying is completed, the pulp mold is taken out from the lower mold (5).

As a molding method of the product using the apparatus and the molding method configured as described above can be as follows.

Example (1),

5 shows an example in which a powdered pulp mixed powder mixed with an adhesive is attached to a mold by a vacuum of 0.05 atm, and molded using a lower mold 5 under a pressure of 20 atm and a temperature of 150 ° C.

Example (2),

An example was prepared by attaching a powdered pulp powder mixed with an adhesive to a mold with a vacuum of 0.01 atm and molding under a condition of a pressure of 80 atm and a temperature of 150 ° C. using a lower mold (5). As shown in Example 6, the homogeneity of the product compared to Example (1), excellent moldability and tensile sensitivity was found to increase significantly, and Table 1 according to the type and content of the adhesive under the molding conditions of Example 2 The change in tensile strength is shown.

Therefore, the present invention is finely pulverized waste paper and the like to obtain a fine powder pulp, by adding the necessary adhesive to prepare a fine powder mixed pulp and using the fine powder mixed pulp pulp mold using little water is environmentally friendly In addition, the molding and drying can be performed quickly, making it possible to utilize various packaging materials, cushioning materials, and building materials, thereby increasing the resource recycling effect and eco-friendliness, and compared to the wet pulp mold forming process as well as the conventional dry pulp mold forming process. It is possible to automate by conveying fine powder pulp using air with little use of water, making it compact and preventing wastewater generation, shortening process, improving production efficiency and controlling pressure and temperature. There is an effect of increasing the possibility of thickness control and strength control.

Claims (3)

Dry mixing the fine powder pulp obtained by finely pulverizing the conventional dry pulp and the adhesive to prepare a mixture with air using the fine powder mixed pulp, and transfer the mixture with air between the molds in a vacuum Attaching the upper mold (3) to the upper mold (3), and moving the lower mold (5) on the attached mixed pulp to bring it into close contact with the upper mold (3) and the heated lower mold (5). Simultaneously molding and drying while keeping the vacuum in order to warm and pressurize the mold, and release the pulp mold after the molding and drying is completed using pressurized air through the upper mold (3). Vacuum forming method of the powdered pulp comprising the step of discharging the release pulp mold. In claim 1, the fine powder mixed pulp obtained by dry mixing the adhesive with the fine powder pulp in the step of transferring in a mixture with air to the upper mold (3) is suspended using a blowing fan 12 Humidification and pressurization while making a mixture of air and mixed pulp in the state and moving the mixture with the air to the upper mold (3) while maintaining the vacuum and the pressurization port (1) at the same time as the lowering of the plunger (7) A method of transporting and adhering a mixture with air using a vacuum, characterized by adhering the heated water vapor supplied through the sphere (4) to the mixed mold of fine powder and attaching it to the upper mold (3). delete

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