KR101802746B1 - Multi-layer filter for 3d printer reducing fine dust - Google Patents

Abstract

The present invention relates to a three-dimensional printer composite filter. More specifically, the present invention relates to a three-dimensional printer composite filter which is capable of reducing fine dust, volatile organic compounds (VOCs) and the like generated when pyrolyzing a filament material of a three-dimensional printer such as plastics and the like. To this end, the three-dimensional printer composite filter of the present invention is formed by laminating a plurality of filter modules and any one of the plurality of filter modules is an ultra low penetration air (ULPA) filter module for removing fine dust in a three-dimensional printer composite filter, wherein the three-dimensional printer composite filter can further comprise an adsorption filter module for removing the VOCs or a prefilter module for prefiltering foreign materials in air to reduce a load of the ULPA filter module. Further, any one or more of the plurality of filter modules laminated can contain an inorganic antibacterial material, and the three-dimensional printer composite filter can further comprise a housing which enables attachment and detachment of the filter modules, and in which the filter modules are in close contact with each other and laminated.

Description

MULTI-LAYER FILTER FOR 3D PRINTER REDUCING FINE DUST}

The present invention relates to a composite filter for a 3D printer, and more particularly to a composite filter for a 3D printer capable of reducing fine dust and volatile organic compounds (VOCs) generated when a filament material such as plastic of a 3D printer is pyrolyzed .

The 3D printer is a device for sequentially ejecting material materials on the basis of a three-dimensional drawing and stacking the layers in a minute thickness to output a three-dimensional shape of a real object, which is easy to use and has a very high speed. The use of such a 3D printer makes it possible to produce various prototypes at homes and schools, and the use thereof has been greatly expanded in recent years. In the production of stereoscopic objects through the 3D printer, the 3D data is firstly completed using a CAD or 3D modeling program, and then the corresponding data is transmitted to the printer through a predetermined data interface. Accordingly, the 3D printer performs the process of creating the corresponding solid object based on the transmitted drawing data. That is, a virtual cross-section is created based on the drawing data, and the filament material such as ABS plastic is sprayed through the nozzle, As the layer is created and fused, the corresponding solid body is produced. At this time, when a predetermined solid object is manufactured through the 3D printer as described above, fine dust and the like generated by pyrolysis upon melting the material in the nozzle device are generated and then discharged to the outside of the apparatus. As a result, And when toxic substances or fine dusts are inhaled into the respiratory tract, there arises a problem that the harmful effect is exerted on the human body.

Korean Patent Publication No. 10-2013-0061820

An object of the present invention is to provide a composite filter for a 3D printer capable of reducing fine dust and volatile organic compounds generated when a filament material such as plastic of a 3D printer is thermally decomposed.

In order to achieve the object of the present invention described above,

The present invention provides a composite filter for a 3D printer in which a plurality of filter modules are laminated, wherein one of the plurality of filter modules is an Ul filter module for removing fine dust.

The composite filter for 3D printer may include an adsorption filter module for removing volatile organic compounds or a pre-filter module for filtering foreign matter in the air to reduce the load of the ultrafilter filter module.

Any one or more of the plurality of filter modules to be laminated may contain an inorganic antibacterial substance.

The composite filter for a 3D printer may include a housing part for attaching and detaching the filter module and laminating them together.

The composite filter for 3D printer according to the present invention includes an ultrafine filter module capable of removing 99.99% of fine dust having a purification efficiency of 0.12 micron, an adsorption filter module or a prefilter module to remove fine dust and volatile organic compounds The effect is excellent. In addition, since the filter modules can be attached and detached individually, only the necessary filter modules can be selectively replaced, which is economically advantageous.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a cross-sectional view of a stacked filter module of a composite filter for a 3D printer according to an embodiment of the present invention.
2 is a perspective view of a filter module of a composite filter for a 3D printer according to an embodiment of the present invention.
3 is a perspective view showing a state in which a composite filter for a 3D printer according to an embodiment of the present invention is attached to and detached from a housing part;
4 is an SEM image of an Ul-wave filter applied to the Ul-wave filter module of FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail to avoid unnecessarily obscuring the subject matter of the present invention.

FIG. 1 is a cross-sectional view of a composite filter 10 for a 3D printer according to an embodiment of the present invention (hereinafter, referred to as a 'composite filter') in which a plurality of filter modules 100 are stacked. A stacked filter module 100 of a composite filter for a 3D printer according to an embodiment of the present invention is shown. 1, the composite filter 10 includes an adsorption filter module 120 for removing volatile organic compounds on the upper side of the UL wave filter module 110 for removing fine dust, It is preferable that the pre-filter module 130 which filters the foreign substances in the air is laminated on the lower end of the Ul-filter module 110 to reduce the load of the UL-filter module 110, but it is not necessarily limited to this order.

The filter module 100 is provided in such a form that a filter 102 such as an ultrasonic filter, an adsorption filter, a prefilter, etc. is supported by a filter support 101 as shown in FIG.

The UL wave filter module 110 is essentially laminated to the composite filter 10, and the remaining adsorption filter module 120 and the pre-filter module 130 may be selectively added and stacked.

3 is a perspective view illustrating a state in which the filter module 100 of the composite filter 10 for 3D printer according to the embodiment of the present invention is attached to and detached from the housing part 200. The housing part 200 includes a filter module 100 So that the air does not escape through the stacked layers of the filter module 100 when the air passes through the openings 210 at the upper and lower ends of the housing part 200 by the ventilation fan (not shown) It is preferable that the filter module 100 is manufactured in accordance with the size of the filter module 100. Further, a separate packing member may be further attached if necessary.

The ULPA (Ultra-Low Penetration Air) filter is a filter for removing fine dust particles having a size of 0.12 micron or more up to 99.999% It is used in a clean room and the like. Such an Ulpa filter may be made of glass fiber or nonwoven fabric.

The adsorption filter applied to the adsorption filter module 120 may be made of activated carbon, zeolite, or the like, and may be used as an adsorption filter if it can remove volatile organic compounds (VOCs). Particularly, in the case of the activated carbon filter, a substance having a large inner surface area of 1,000 m 2 or more per 1 g is used as an adsorbent having carbon pellets such as coconut angle, wood, lignite, anthracite coal, bituminous coal, More preferable.

The pre-filter module 130 is a filter for reducing the pressure loss of the moving air and primarily removing large dusts (yellow dust, animal hair, blanket dust) of about 20 μm floating in the air, There is also an effect of reducing the pressure drop when the filter passes through the filter. It can be a nonwoven filter or a porous sponge filter mainly made of polyvinyl chloride (PVC), polyethylene (PE), or polypropylene (PP) fiber.

Any one or more of the plurality of filter modules 100 to be stacked may contain an inorganic antibacterial substance, and may be an Ulfar filter module 110 or a prefilter module 130. The inorganic antimicrobial material may be nanoparticles of Titanla (TiO2), zinc oxide (ZnO) or silver (Ag), and in particular zinc oxide as an inorganic antimicrobial agent has excellent levels of poisons against poisons or bacteria It is more preferable that a single-celled animal such as bacteria, viruses, fungi, etc. acts on oxygen and a special enzyme for digestive metabolism to neutralize it. As an inorganic antimicrobial agent, the risk to the environment is significantly lower than that of silver nanoparticles, and the human body suitability is excellent, which is more preferable.

Such zinc oxide may be in the form of a conventional powder powder, or may have a powder form consisting of secondary particles in which primary particles are aggregated. As a method of producing zinc oxide having primary particles and secondary particles, for example, primary particles produced by a wet chemical process can be manufactured by a method of forming secondary particles through a milling process . Specifically, for example, after a water or basic strong zinc hydroxide is added to an aqueous zinc zinc halide solution and reacted, a strong basic compound that does not provide water is added, and then the temperature is elevated to obtain zinc oxide primary zinc oxide particles having an average particle diameter of 1 nm to 50 nm The zinc oxide primary particles of the particle structure can be obtained by forming and separating the particles and allowing the zinc oxide primary particles to maintain the average particle diameter of the secondary particles within the range of 0.1 탆 to 10 탆 through the milling process. The milling process may be performed, for example, using a jet mill, a beads mill, a high energy ball mill, a planetary mill, a stirred ball mill, (vibration mill) or the like.

As an example of a method for incorporating the zinc oxide into the filter module, a master batch containing the zinc oxide at a high concentration is prepared, and then the master batch is mixed with a polymer resin in accordance with a desired zinc oxide content in each filter module May be melt-spun into a filter to produce a nonwoven fabric. The melt spinning can be carried out by a duplicated component composite spinning or simple spinning method, and can also be produced as short fibers. The polymer resin may be, for example, an acrylonitrile-butadiene-styrene (ABS), a polypropylene (PP), a polyethylene (PE), a polystyrene (PS), a polyvinyl acetate (PVAc), a polyacrylate, At least one member selected from the group consisting of polyvinylidene fluoride (PET), polyvinyl chloride (PVC), polymethyl methacrylate (PMMA), ethylene-vinyl acetate copolymer (EVA), polycarbonate (PC), polyamide, . ≪ / RTI >

[Experimental Example]

1. Antimicrobial activity

(1) Production example

The nano-sized zinc oxide powder particles (zinc oxide, primary particle diameter 5 to 15 nm, specific surface area 47 m ² / g) as antimicrobial material were maintained at about 1.7 탆 in secondary particle diameter through a shredder, MI-800) and a high-pressure extruder (equipment having the Korea Institute of Production Technology) at a weight ratio of 1:19. The masterbatch was again mixed with polypropylene (MI-800) at a weight ratio of 1: 4, melted at 180 ° C through a Melt Brown nonwoven fabric manufacturing facility possessed by the Korean Institute of Production Technology and spun to obtain a meltblown nonwoven fabric sheet . A low melting point nonwoven fabric sheet (LM30, Korea Industrial Technology Institute) was placed on both sides of the melt-blown nonwoven fabric sheet and thermally bonded to produce a triple-layered antibacterial filter.

(2) Comparative Production Example

The melt-brown nonwoven fabric sheet for prefiltering was prepared by melting and radiating polypropylene (MI-800) at a temperature of 180 ° C through Melt Brown nonwoven fabric manufacturing facility having a production facility of MIT Brown, without zinc oxide, A nonwoven fabric sheet of low melting point (LM30, Korea Industrial Technology Institute) was placed on both sides of the nonwoven fabric sheet and thermally joined to produce a triple structure filter.

(3) Evaluation results

The antimicrobial activity of the filter according to the Comparative Production Example and the antibacterial filter according to the Production Example was examined according to the method of KS J 4206. Staphylococcus aureus ATCC 6538 was used as an experimental strain.

- Test conditions: The test strain was incubated at 37 ± 1 ° C for 24 hours with shaking, and the number of bacteria was measured (120 times / min of shaking)

- Test sample weight: 2.0 g

- Neutral solution: Phosphate buffer solution (pH 7.0 ± 0.2)

- Growth rate (F): Mb / Ma (31.6 times or more)

- Ma: initial number of bacteria (average value)

- Mb: number of bacteria (average value)

- Mc: number of bacteria (average value) of the test sample after 24 hours of incubation

[Table 1]

(* CFU = Colony Forming Unit, <= less)

Although the present invention has been described with reference to the above embodiments, the present invention is not limited thereto. It will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.

10: Composite filter 100: Filter module
110: Ulpa filter module 120: Adsorption filter module
130: pre-filter module 200: housing

Claims (4)

1. A composite filter for a 3D printer comprising a plurality of filter modules stacked,
The composite filter for 3D printer includes an adsorption filter module for removing volatile organic compounds; A pre-filter module for filtering out foreign substances in the air to reduce the load of the ULPA filter module; And an Ulpa filter module containing zinc oxide antimicrobial material in the form of powder in which secondary zinc oxide particles are formed through a milling process on the primary zinc oxide particles. delete delete delete

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