KR20050079205A - Manufacture of gac composite non-woven filter with three dimensional structure - Google Patents

Abstract

The present invention is a manufacturing process of a composite nonwoven filter product with a GAC configured to have both high-efficiency odor and harmful gas adsorption efficiency characteristics of granular activated carbon (GAC) and high-efficiency filtration characteristics of the nonwoven fabric, which is a fiber assembly formed by the radiation principle. And a GAC supply.

In the invention, the process of injecting GAC into the fiber spun through the nozzle is made at the same time in the nonwoven fabric manufacturing process using spinning principle. In the manufacturing process of the GAC composite nonwoven filter product, and characterized in that the non-woven fabric manufacturing process and the GAC supply device at the same time.

Description

Manufacture of GAC composite non-woven filter with three dimensional structure}

Filter media for removing and collecting fine dust, odors, and toxic gases in the air have been produced in various ways, and researches on new manufacturing methods have been conducted to improve performance.

Recently, many composite dry filters using adsorption characteristics, odor removal characteristics, and the like by microporous activated carbon have been manufactured. Types of activated carbon include carbon powder, granular activated carbon (GAC), and activated carbon fiber (ACF), and GAC having the best characteristics for filters is mainly used.

The manufacturing process of the filter nonwoven fabric includes a needle punching manufacturing method, a spunbond manufacturing method, a meltblown manufacturing method, and the like. To date, the manufacturing method is relatively simple and the needle punching manufacturing method with the largest domestic production is increasing. Such dry nonwoven filters can be classified as shown in Figs. Figure 1 is a dry filter by laminating nonwoven fabrics with different characteristics, which has the disadvantage of high differential pressure and low filtration efficiency. Figure 2 is a stack of functional nonwoven fabrics and activated carbon particles, and adhesives (indicated by black dots in the figure) are used to maintain the shape of the activated carbon layer. The adhesive used has the disadvantage of blocking the micropores of some activated carbons, the efficiency of which is dramatically reduced, and a characteristic odor due to the modification of the adhesive during long term storage.

Figure 3 shows the activated carbon fixed by the spongy structure of the nonwoven fabric without using the adhesive. It has high efficiency and low differential pressure. It is easy to handle and can use various functional GACs, and it is a bending filter for maximizing the filtration area. The production of pleated filter media is easy.

The conventional nonwoven filter manufacturing method of the three-dimensional structure is shown in Figures 4 and 5. Figure 4 is a manufacturing method produced in Korea, China, Taiwan, etc. It is produced by applying needle punching after applying GAC in web state after carding process. Due to the extremely small handling difficulty, and the maximum filling density of the GAC is low, it is difficult to produce high efficiency products.

Figure 5 shows a recently developed manufacturing method in the United States, in which a bicomponent fiber having a low melting point sheath structure and a high melting point core structure and heat-pressure are applied after application of a GAC. It is a method of manufacturing a filter medium by thermal bonding between fibers and fiber-GAC. This is because the price of raw material is very high, the price competitiveness is very low, and short fiber is used, so it must be bonded by applying heat and pressure, which lowers the flexibility and bending characteristics of the filter. In addition, the collection efficiency by GAC acts greatly, and the separation efficiency of the nonwoven fabric is virtually low, resulting in low overall filter efficiency.

The manufacturing of a composite nonwoven filter having a three-dimensional structure including a GAC has the following problems. ① Most nonwoven fabric manufacturing process and GAC coating process cannot be processed at the same time. ② GAC's round appearance and various size distribution make it difficult to handle in general nonwoven fabrics. The use of adhesives can drastically reduce the filter efficiency.

Therefore, the object of the present invention can be solved by the method of adding the GAC when forming the web in the nonwoven fabric manufacturing process using the spinning principle, high efficiency by the combination of various GAC filling density and ultra-fine fibers, handling and cutting It is to provide a technology for a new manufacturing process to enable the production of functional nonwoven filter products with easy bending.

3 is a diagram illustrating a manufacturing process of a nonwoven fabric using a spinning principle and a GAC input process at the same time, and a filter product having a three-dimensional structure. The main processes include a spinning section 16, a drawing section and a cooling section 17, It consists of a web lamination section 18 and the input section by the GAC supply device 10.

And the most important spiral action of the fiber in the present invention occurs at the boundary between the stretching / cooling section 17 and the web stacking section 18. The manufacturing technology for each section is as follows.

1. Spinning section 16: The molten resin 20 reaches the spin pack is passed through the filter is radiated at a high pressure from the nozzle (4), the high temperature and high pressure air (6) through the air plate (5) is a filter It is an important factor in manufacturing.

2. Stretching and Cooling Section 17: The spun resin is drawn rapidly in the longitudinal direction by a high-speed air-jet, and after a certain period, the spiral motion 21 is made with a decrease in speed. The spiral motion 21 has a three-dimensional structure when laminated with a nonwoven fabric, and the temperature-controlled GAC is injected into the nonwoven fabric with a uniform distribution in this section. That is, the GAC sprayed on the fiber is instantaneously thermally bonded to produce a stable composite filter having a three-dimensional structure.

3. Web lamination section 18: It is necessary to control the distribution of potential heat energy of the nonwoven fabric in the lamination section for optimal filter production, and the temperature, pressure relation and the collector (7) during spinning to control the size of the spiral motion (21). The setting of the DCD 15, which is the distance between the nozzle and the nozzle 4, is important.

In conclusion, in the system of the nonwoven fabric manufacturing process using the conventional radiation principle, the collector (7) and the GAC supply device (10) suitable for setting the optimum conditions such as temperature and pressure for each section, distance for each section, and GAC input (10). Can be summarized as a design.

<Example 1>

Filter Type: GAC Composite Nonwoven Filter

Spinner DIE Temperature: 250 ℃

Hot-air temperature: 150 m / sec

DCD: 20cm

Separation material: Paraffin oil, NaCl

Flow rate: 95LPM

Separation efficiency: 94.0% or more

Intake resistance: 24.0mm H ₂ O or less

According to the manufacturing method of the present invention, the use of a chemical adhesive, which is a disadvantage of the conventional GAC composite nonwoven filter, the loss of flexibility due to structural coupling, the difficulty of rolling and bending processes, and the lack of bonding strength of the GAC. The inconvenience of handling due to spillage can be eliminated, and the effect of productivity improvement and cost reduction by omission and omission of process is very large.

1 is a detailed cut-away plan view of a GAC composite nonwoven filter product of the present invention

Figure 2 is a partial side cross-sectional view cut along the line CC 'of FIG.

Figure 3 is a detailed view of the manufacturing process GAC composite nonwoven filter of the three-dimensional structure of the present invention

Figure 4 is a detailed view of the temperature control GAC supply apparatus of the present invention

<Description of the code | symbol about the principal part of drawing>

1: nonwoven fabric 2: granular activated carbon

5: air plate 6: high temperature / high pressure air

7: Collector 8: Web Screen

9: suction device 10: temperature control GAC supply device

13: winding of the nonwoven fabric filter 14: dieswell development

15: Distance between collector and nozzle (DCD) 16: Spinning section

17: stretched / cooled section 18: web laminated section

19: GAC supply unit heating part 20: molten resin

21: spiral movement

Claims (4)

Process for manufacturing nonwoven fabric in a new composite process that allows granular activated carbon to be simultaneously attached to fibers spun between the nozzle and the collector of nonwoven fabric manufacturing process (melt-blown, spunbond) using spinning principle The method of claim 1 is applied to the process of claim 1 by applying a GAC supply device (piece of roller method) configured to quantify granular activated carbon and to control temperature in the range of 10 to 100 ° C. Manufacturing method of multi-functional GAC-attached nonwoven product formed to have the characteristic of dimensional structure Building interior and exterior materials and interior products having gas adsorption and filtration characteristics manufactured by the method as described in claim 2 and products for water treatment filter and air filter GAC feeder of the engraving roller method including the method of claim 2 and the method of attaching a scraper to the engraving roller method