KR20030039125A - Impregnated micro-fiber filtra tion unit - Google Patents

Abstract

PURPOSE: A sprayed fiber filter media having an inner part forming activating material is provided, a method for forming a micro fiber filter media having a layered activating material is provided, and a filter media formed of an activating material and fabricated economically is provided. CONSTITUTION: The filter media comprises multiple superposition layers formed of fiber forming material; and an activating material applied over the layers, wherein the superposition layers are fused to each other. The method comprises the steps of supplying a liquid base material(12); forming multiple mixed extended strands; forming a filter media by winding the strands on mandrel(20) by superposition self adhesion; changing a direction of the strands from the nozzle(18) to a lateral side for a strand moving direction at a position between nozzle and mandrel; and depositing an activating material(14) on the strands between the position and mandrel. The method for fabricating a filter unit comprises the steps of supplying a liquid base material; forming the base material into a plural mixed extended strands through nozzle by air flow; forming a filter media by winding the strands on mandrel by superposition self adhesion; cutting off the air flow as soon as the strands come out of the nozzle at a position between the nozzle and mandrel; and piling up an activating material on the strands between the position and mandrel.

Description

Impregnated microfiber filtration material and its manufacturing method {IMPREGNATED MICRO-FIBER FILTRATION UNIT}

TECHNICAL FIELD The present invention relates to a filter medium, and is particularly used in bag designs having an overlapping layer of fibrous material with an active material used in microfiber units or interlayers of a cartridge.

US Patent No. 3,816,304; 4,902,427; 5,389,166; And filter media as disclosed in 5,679,251 have been produced and the active material is made in the fiber material. The filter media of sprayed microfibers molded into cartridges or filter bags is economical and very efficient. One example of such a unit is disclosed in US Pat. No. 4,983,292, incorporated herein by reference. To date, there is no introduction of active materials related to such spray microfiber materials, but such active materials are generally introduced in powder or small particle form. When the active material is supplied to the flow of sprayed microfibers, the airflow mixes with the microfibers to diffuse the active material and essentially prevents it from depositing on the chain of sprayed fibers.

In the present invention, when one turns transversely, the air flow is blocked so that the active material is deposited on the chain of material before reaching the mandrel where the filter unit is formed. In this way the active material is sandwiched between the chain layers of the fiber material, which fuses together to maintain the active material in the molded filter material.

Accordingly, it is an object of the present invention to provide a spray fiber filtration material having an internal forming active material.

Another object of the present invention is to provide a method for forming a microfiber filter material having a layered active material.

It is still another object of the present invention to provide a filter medium molded from an active material and economically manufactured.

Other objects of the present invention will become apparent upon reading the following specification.

1 is a cross-sectional view of the filter medium showing the active material laminated on the material,

FIG. 2 is a side view showing the filter medium of FIG. 1 molded; FIG.

[Explanation of symbols on the main parts of the drawings]

10: filter medium, 12: base material, 14: active material,

18: nozzle, 20: mandrel, 22: roller

(Example)

The filter medium 10 as shown in the cross section of FIG. 1 includes a multiple overlapping fusion layer of the base material 12 in which the active material 14 is layered. The unit 10 described in the figure is cylindrical and is known in the market as a cartridge filter. Nevertheless, the present invention is also considered to be applicable to bag type filters. The filter medium 10 has an open core 16. The outermost and innermost layers of the filter medium 10 are preferably formed of only the base material to form a seal of the active material 14 which is internally dispersed or sandwiched between the layers of the base material in the center of the filter medium. Do. The base material 12 is preferably sprayed microfiber such as polypropylene. The active material 14 may form a multi-angled selected material depending on the intended use of filtration, such as for irrigation and fertilization, sterilization or purification purposes. For example, the active material may be carbon particles for water filtration.

FIG. 2 illustrates a method of manufacturing the filter unit of FIG. 1. Nozzle 18 and mandrel 20 are provided. In general, in the manufacture of a cartridge filter, a liquefied molding base material is injected from the nozzle 18 into a multi-stranded chain wound around the mandrel 20. As the chain is wound around the mandrel 20 in its heated form, internal sticking occurs between the chains. This gives the porosity of the filter material. When the required thickness of the material is reached on the mandrel 20, the flow of the material chain through the nozzle 18 is ended and the wrapped overlapping fiber material is removed from the mandrel. The elongation unit is now cut into the elongated parts of the required length and properly packaged.

In this invention, the passage of the injection base material 12 is blocked by being displaced laterally as in the method by the roller 22. This displacement of the base material blocks or redirects the air flow accompanying the chain of the base material as it is ejected from the nozzle 18. The dosing nozzle 24 between the roller 22 and the mandrel 20 deposits the active material 14 layered on the chain of the base material 12 in the same way as by gravity or other means. The controlled flow of the active material 14 is not disturbed or blocked due to the dispersion of the material chain made by the roller 22 as it is deposited on the chain of the base material. The base material 12 is wound on the mandrel by causing the active material to be caught between the adhesive layers of the base material as the layer is cooled on the mandrel 20 together with the layer of the active material 14. In general, the filter medium 10 is formed by first winding a plurality of layers of the base material 12 on a mandrel and then applying the active material 14. The coating of the active material 14 on the chain of the base material ends just before reaching the final diameter of the filter material, causing the multiple chains of the base material only to be wound on the outer layer of the unit. In this way, the active material is trapped between the pure layers of the base material on which the base material can perform primary filtration.

It is possible to utilize the package 10 made of an elongated cylindrical, shrink-wrapped plastic with respect to the elongated cylindrical unit 10 before or after being removed from the mandrel 20. The unit is then removed from the mandrel and cut to length. In this way the outside of the filter medium is kept in a clean manner without the active material moving out of the unit.

The invention of the subject matter is not limited to the above specification and may be modified within the scope of the appended claims.

Claims (11)

The filter material comprises a multiple overlapping material of fibrous material, an active material applied over the layers, and the overlapping layers fused to each other. The filter medium according to claim 1, wherein the active material is carbon. The filter medium according to claim 2, wherein the fibrous material is plastic. 4. The filter medium according to claim 3, wherein the fibrous material is polypropylene. The method for producing the filter medium includes the following steps: a. Supply of liquid base material, b. The base material is passed through a nozzle to form a multi-mixed extension chain, c. Winding the chain on the mandrel by self-adhesion of overlap to form a filter medium, d. Diverts the chain transversely with respect to the chain flow direction from the nozzle at a position between the nozzle and the mandrel, e. Depositing an active material on the chain between the position and the mandrel. The method of claim 5, wherein the active material is carbon. The method of claim 6, wherein the base material is plastic. The method of claim 7, wherein the base material is polypropylene. 6. The method of claim 5, wherein step (e) produces the elongated cylindrical filter medium and then packages the filter medium while removing the package filter material from the coated mandrel to cut the package into elements of constant length. The method of claim 5 and the step of stopping the deposition of the active material of the strands while continuing to wind the chains on the mandrel to composite the base only with respect to the outside of the filter media. A method comprising forming a chain. Creating a filter unit involves the following process: (a) provision of a liquid base material; (b) propagating the base material into a plural mixed extension chains through a nozzle by air flow; (c) forming the filter material by winding the chain on a mandril by a superposition self-adhesive method, (d) shut off the air flow as soon as the nozzle emerges from the position between the nozzle and the maddrill; (e) depositing the active material on the chain between the position and the mandrel.