KR100355860B1 - A manufacturing method of oil filter having a long life - Google Patents
A manufacturing method of oil filter having a long life Download PDFInfo
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- KR100355860B1 KR100355860B1 KR1020000028176A KR20000028176A KR100355860B1 KR 100355860 B1 KR100355860 B1 KR 100355860B1 KR 1020000028176 A KR1020000028176 A KR 1020000028176A KR 20000028176 A KR20000028176 A KR 20000028176A KR 100355860 B1 KR100355860 B1 KR 100355860B1
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- oil filter
- filter
- oil
- manufacturing
- heat treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
- B01D39/18—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being cellulose or derivatives thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
- B01D39/2003—Glass or glassy material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
- B01D39/2003—Glass or glassy material
- B01D39/2017—Glass or glassy material the material being filamentary or fibrous
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/04—Additives and treatments of the filtering material
- B01D2239/0464—Impregnants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/10—Filtering material manufacturing
Abstract
본 발명은 오일 여과용 필터 제조방법에 관한 것으로서, 보다 상세하게는 펄프와 폴리에스터 및 글라스화이버 재료를 소정비율로 하여 물과 혼합한 후 이를 오일필터 성형기에 투입하여 성형과 함침 및 가열과정을 거쳐 제조된 오일필터의 제조방법에 관한 것이다.The present invention relates to a method for manufacturing an oil filtration filter, and more particularly, pulp, polyester, and glass fiber materials in a predetermined ratio, mixed with water, and then injected into an oil filter molding machine to undergo molding, impregnation, and heating. It relates to a manufacturing method of the oil filter produced.
본 발명의 목적은 오일 정화능력이 뛰어나고 장기간 사용할 수 있어 수명이 오래가며 오일필터의 제조가 수월함과 아울러 오일필터의 재활용이 가능한 오일여과기의 오일필터 제조방법을 제공하는데 있다.It is an object of the present invention to provide an oil filter manufacturing method of an oil filter, which is excellent in oil purification capability and can be used for a long time, has a long life, facilitates the manufacture of an oil filter, and enables the recycling of an oil filter.
상기의 목적을 달성하기 위한 본 발명은 펄프와 폴리에스터와 글라스화이버를 적정비율로 하여 물과 혼합하는 필터재료 혼합공정과, 상기 혼합된 필터재료를 오일필터 성형기에 투입한 후 모터를 구동시켜 상기 오일필터 성형기를 상하로 진동시켜 투입된 필터재료로 부터 수분을 제거하여 성형하는 오일필터 성형공정과, 상기 오일필터 성형공정이 종료하면 가열기를 이용하여 소정시간동안 건조시키는 제1열처리 공정과, 상기 제1열처리 공정이 종료되면 열처리된 오일필터를 페놀수지에 함침하여 경화시키는 오일필터 경화공정과, 상기 함침처리된 오일필터를 가열기를 이용하여 건조시키는 제2차열처리 공정으로 이루어지는 것을 특징으로 한다.The present invention for achieving the above object is a filter material mixing step of mixing the pulp, polyester and glass fibers with water at an appropriate ratio, and the mixed filter material is introduced into an oil filter molding machine to drive the motor An oil filter molding step of removing water from the filter material introduced by vibrating the oil filter molding machine up and down, and forming the oil filter; a first heat treatment step of drying the heater filter for a predetermined time when the oil filter molding step is completed; When the first heat treatment step is completed, the oil filter curing step of impregnating and curing the heat-treated oil filter in phenol resin, and the second secondary heat treatment step of drying the impregnated oil filter using a heater.
여기서, 상기 오일필터의 재료의 혼합비율을 펄프 75-80 중량%, 폴리에스터 8-15 중량%, 글라스화이버 10-12 중량 %로 하는 것이 바람직하다.Here, it is preferable that the mixing ratio of the material of the oil filter is 75-80 wt% of pulp, 8-15 wt% of polyester, and 10-12 wt% of glass fiber.
Description
본 발명은 오일 여과용 필터 제조방법에 관한 것으로서, 보다 상세하게는 펄프와 폴리에스터 및 글라스화이버 재료를 소정비율로 하여 물과 혼합한 후 이를 오일필터 성형기에 투입하여 성형과 함침 및 건조과정을 거쳐 제조된 오일필터의 제조방법에 관한 것이다.The present invention relates to a method for manufacturing an oil filtration filter, and more particularly, pulp, polyester, and glass fiber materials in a predetermined ratio, mixed with water, and then injected into an oil filter molding machine to undergo molding, impregnation, and drying. It relates to a manufacturing method of the oil filter produced.
일반적으로, 엔진오일은 크랭크축이나 캠축의 윤활,냉각을 수행하며 동시에 엔진내부의 금속가루나 연소잔류물등의 청정활동을 함에 따라 엔진내부를 순환하는 엔진 오일속에는 연소생성물, 금속가루 및 각종침전물등의 미세한 불순물을 함유하고 있다.In general, engine oil lubricates and cools the crankshaft or camshaft, and cleansing the metal powder and combustion residues inside the engine, so that the engine oil circulates inside the engine, such as combustion products, metal powder, and various sediments. It contains fine impurities.
그래서, 상기한 엔진오일에 포함된 불순물을 제거하기 위해 오일여과기가 사용되고 있으며, 오일펌프에서 토출되는 오일이 여과되도록 되어 있다.Thus, an oil filter is used to remove impurities contained in the engine oil, and the oil discharged from the oil pump is filtered.
제5도에 도시된 바와 같이, 종래의 차량용 오일 여과기는, 원통상의 코어(100)와, 상기한 코어(100)의 외부에 삽입고정되는 여과지(102)와, 상기한 코어(100)와 상기한 여과지(102)의 양측단부에 위치하여 설치되는 상부캡(104)과, 하부캡(106)을 포함하여, 상기한 코어(100)의 내부에 설치되며 오일 압력 상승시 오일을 직접 공급하는 릴리이프 밸브(108)로 이루어져 있다.As shown in FIG. 5, the conventional oil filter for a vehicle includes a cylindrical core 100, a filter paper 102 inserted into and fixed to the outside of the core 100, and the core 100. Including the upper cap 104 and the lower cap 106, which are located on both side ends of the filter paper 102, is installed inside the core 100 to directly supply oil when the oil pressure rises Consists of a relief valve 108.
상기 코어(100)의 내부에 릴리이프 밸브(108)가 설치될 수 있도록 상기한 하부캡(106)의 중앙에는 밸브 고정부(110)가 형성되어 있으며 상기 밸브 고정부에는 릴리이프 밸브(108)에 의해 개폐되어 비여과된 오일을 코어(100)내로 유입시킬 수 있도록 하는 오일 유입구(112)가 뚫어져 있다.A valve fixing part 110 is formed at the center of the lower cap 106 so that the relief valve 108 can be installed inside the core 100, and the valve fixing part has a relief valve 108. The oil inlet 112 is opened to allow the oil that is opened and closed by the filter to be introduced into the core 100.
또한 상기한 밸브 고정부(110)에 고정될 수 있도록 릴리이프 밸브(108)에는 일정한 길이를 갖는 용접부(114)가 형성되며 오일이 통할 수 있도록 장공(126)이 구비된 밸브 하우징(116)과 상기한 릴리이프 밸브(108)의 밸브 하우징(116) 내부에 개재되어 오일의 유통을 개폐하는 밸브 디스크(118)와 상기한 밸브 하우징(116) 내부에 개폐되어 상기한 밸브 디스크(118)에 탄성력이 작용되도록 설치된 탄성 스프링(120)으로 이루어져 있다.In addition, the relief valve 108 is formed in the relief valve 108 to be fixed to the valve fixing part 110 and the valve housing 116 is provided with a long hole 126 to allow oil to pass through and The valve disk 118 interposed in the valve housing 116 of the relief valve 108 to open and close the flow of oil and the valve disk 118 to be opened and closed inside the valve housing 116 to provide elastic force to the valve disk 118. It consists of an elastic spring 120 installed to act.
그리고 상기한 릴리이프 밸브(108)의 용접부(114)가 상기한 하부캡(106)의 밸브 고정부(110)는 프로젝션 용접을 하여 고정된다.In addition, the welding part 114 of the relief valve 108 is fixed to the valve fixing part 110 of the lower cap 106 by projection welding.
그리고, 상기한 여과지(102)에 의해 여과된 오일과 릴리이프 밸브(108)를 통해 유입되는 비 여과된 오일을 엔진의 내부로 순환시키는 유로호오스로 보낼 수 있도록 유로호오스와 결합되는 유로결합부(122)가 상부캡(104)의 중앙에 형성된다.And, the flow path coupling portion coupled to the flow path hose so that the oil filtered through the filter paper 102 and the non-filtered oil flowing through the relief valve 108 can be sent to the flow path hose circulating into the engine ( 122 is formed in the center of the upper cap 104.
또한 상기한 여과지(102)에 의해 여과된 오일이 코어(100)의 내부로 흘러 들어갈 수 있도록 코어(100)의 외주면에는 여과지(102)와 통하는 보수개의 통공(124)이 구비된다.In addition, the outer circumferential surface of the core 100 is provided with a conservative opening 124 communicating with the filter paper 102 so that the oil filtered by the filter paper 102 flows into the core 100.
상술한 바와 같이 구성된 종래의 오일 여과기는 불순물이 함유된 오일이 상기한 여과지(102)의 외주면에서 내부로 이동하면 상기한 여과지(102)에 의하여 오일의 불순물이 여과되어 통하게 된다.In the conventional oil filter configured as described above, when the oil containing impurities moves from the outer circumferential surface of the filter paper 102 to the inside, the impurities of the oil are filtered and passed through the filter paper 102.
그리고, 상기한 여과지(102)를 통과한 오일은 상기한 코어(100)의 통공(124)을 통하여 코어(100)의 내부로 흘러 들어가고 상기한 코어(100)를 통과한 오일은 상기한 상부캡(104)의 유로 결합부(122)와 결합된 도시되지 않은 호오스로 인입되어 엔진의 각 부분으로 토출되는 것이다.The oil passing through the filter paper 102 flows into the core 100 through the through hole 124 of the core 100, and the oil passing through the core 100 is the upper cap. Into the hose (not shown) coupled with the flow path coupling portion 122 of the 104 is discharged to each part of the engine.
그리고 상기 릴리이프 밸브(108)는 여과지(102)의 투과저항이 증대하여 상기 여과지(102)의 외부 압력이 높아지면, 일정한 차압이 발생되고 릴리이프 밸브(108)가 열리어 여과되지 않은 오일이 상기한 하부캡(106)의 오일유입부(112)를 통해 유입된다. 유입된 오일은 상기한 릴리이프 밸브(108)의 하우징(116)의 외주면에 형성된 장공(126)을 통하여 상기한 코어(100)의 내부로 통하고, 상기 상부캡(104)의 유로 결합부(122)와 결합된 유로 호오스로 토출된다.When the relief valve 108 has increased permeation resistance of the filter paper 102 and the external pressure of the filter paper 102 is increased, a constant differential pressure is generated and the relief valve 108 is opened so that the oil is not filtered. It is introduced through the oil inlet 112 of the lower cap 106. The introduced oil passes into the core 100 through the long hole 126 formed on the outer circumferential surface of the housing 116 of the relief valve 108, and the flow path coupling part of the upper cap 104 ( 122 is discharged to the flow path hose combined with.
그러나, 상술한 바와같은 종래의 오일여과기는 불순물이 함유된 오일을 여과지를 이용하여 정화시켜야 함으로서 여과능력이 떨어질 뿐만 아니라 이로인해 수명이 단축되고 재생하여 사용하기가 사실상 불가능하여 환경오염을 유발하였으며 제조공정이 복잡하다는 문제점이 있었다.However, the conventional oil filter as described above not only reduces the filtration capacity by purifying the oil containing impurities using filter paper, but also shortens the lifespan and thus makes it impossible to recycle and use, causing environmental pollution. There was a problem that the process is complicated.
본 발명은 상기의 문제점을 해결하기 위해 창안된 것으로서, 본 발명의 목적은 오일 정화능력이 뛰어나고 장기간 사용할 수 있어 수명이 오래가며 오일필터의 제조가 수월함과 아울러 오일필터의 재활용이 가능하여 자원의 낭비를 막고 환경오염을 줄일 수 있는 오일여과기의 오일필터 제조방법을 제공하는데 있다.The present invention has been made to solve the above problems, the object of the present invention is excellent oil purification ability and can be used for a long time, long life, easy to manufacture the oil filter, and the oil filter can be recycled and The present invention provides an oil filter manufacturing method of an oil filter to prevent waste and reduce environmental pollution.
상기의 목적을 달성하기 위한 본 발명은 펄프와 폴리에스터와 글라스화이버를 적정비율로 하여 물과 혼합하는 필터재료 혼합공정과, 상기 혼합된 필터재료를 오일필터 성형기에 투입한 후 모터를 구동시켜 상기 오일필터 성형기를 상하로 진동시켜 투입된 필터재료로 부터 수분을 제거하여 성형하는 오일필터 성형공정과, 상기 오일필터 성형공정이 종료하면 가열기를 이용하여 소정시간동안 건조시키는 제1차열처리 공정과, 상기 제1차열처리 공정이 종료되면 열처리된 오일필터를 페놀수지등에 함침하여 경화시키는 오일필터 경화공정과, 상기 함침처리된 오일필터를 가열기를 이용하여 건조시키는 제2차열처리 공정으로 이루어지는 것을 특징으로 한다.The present invention for achieving the above object is a filter material mixing step of mixing the pulp, polyester and glass fibers with water at an appropriate ratio, and the mixed filter material is introduced into an oil filter molding machine to drive the motor An oil filter molding step of removing water from the filter material injected by vibrating the oil filter molding machine up and down, and forming the oil filter; a first heat treatment step of drying the heater filter for a predetermined time when the oil filter molding step is completed; When the first heat treatment process is completed, the oil filter curing step of impregnating and curing the heat-treated oil filter by phenol resin, and the second heat treatment step of drying the impregnated oil filter using a heater. .
여기서, 상기 오일필터의 재료의 혼합비율을 펄프 75-80 중량%, 폴리에스터 8-15 중량%, 글라스화이버 10-12 중량 %로 하는 것이 바람직하다.Here, it is preferable that the mixing ratio of the material of the oil filter is 75-80 wt% of pulp, 8-15 wt% of polyester, and 10-12 wt% of glass fiber.
도1은 본 발명의 오일필터를 제조하기 위한 성형장치이고,1 is a molding apparatus for manufacturing an oil filter of the present invention,
도2는 도1에서 오일필터 성형용 재료가 투입되는 금형을 나타내는 도면이며,2 is a view showing a mold into which the oil filter molding material is injected in FIG.
도3은 본 발명에 의해 제조된 오일필터이고,Figure 3 is an oil filter manufactured by the present invention,
도4는 본 발명의 오일필터 제조방법에 의해 제조된 오일필터가 장착된 오일여과기를 나타내는 사시도이며,도5는 종래의 오일여과기를 나타내는 단면도이다.Figure 4 is a perspective view showing an oil filter equipped with an oil filter manufactured by the oil filter manufacturing method of the present invention, Figure 5 is a cross-sectional view showing a conventional oil filter.
* 도면의 주요부분에 대한 부호의 설명** Explanation of symbols for the main parts of the drawings *
10 : 본체 20 : 하부풀리10: main body 20: lower pulley
40 : 상부풀리 50 : 회전축40: upper pulley 50: rotation axis
60 : 편심원판 70 : 축지지부재60: eccentric disc 70: shaft support member
80 : 봉부재 90 : 필터성형기80: rod member 90: filter molding machine
100 : 안착대100: seating table
이하, 본 발명의 바람직한 일 실시예를 첨부된 도면을 참조하여 설명하면 다음과 같다.Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.
도1은 본 발명의 오일필터를 제조하기 위한 성형장치이고, 도2는 도1에서 오일필터 성형용 재료가 투입되는 금형을 나타내는 도면이며, 도3은 본 발명에 의해 제조된 오일필터이고, 도4는 본 발명의 오일필터 제조방법에 의해 제조된 오일필터가 장착된 오일여과기를 나타내는 사시도이다.1 is a molding apparatus for manufacturing an oil filter of the present invention, Figure 2 is a view showing a mold into which the oil filter molding material is put in Figure 1, Figure 3 is an oil filter manufactured by the present invention, Figure 4 is a perspective view showing an oil filter equipped with an oil filter manufactured by the oil filter manufacturing method of the present invention.
상기 도1에 도시된 바와같이 본체(10) 내부에는 외부 전기를 인가받아 회전되는 모터(M)와, 상기 모터의 회전력으로 회전되는 상부풀리(40) 및 하부풀리(20)가 구비되어 있다.As shown in FIG. 1, the main body 10 includes a motor M that is rotated by applying external electricity, and an upper pulley 40 and a lower pulley 20 that are rotated by the rotational force of the motor.
또한, 상기 상부풀리(40)는 회전축(50)과 직결되어 있고 상기 회전축(50)을 내삽/지지하는 축지지부재(70)가 구비되며 회전축(50)상에는 회전축의 회전에 따라 상/하 소정변위로 편심 회전하는 편심원판(60)이 구성되어 있다.In addition, the upper pulley 40 is directly connected to the rotating shaft 50 and is provided with a shaft support member 70 for interpolating / supporting the rotating shaft 50, the upper / lower predetermined on the rotating shaft 50 according to the rotation of the rotating shaft The eccentric disc 60 which eccentrically rotates by displacement is comprised.
상기 편심원판(60)과 일체로 구성되어 상/하 운동을 하는 봉부재(80)와, 상기 봉부재(80)의 상/하 운동에 따라 진동되며 오일필터 원료가 투입되는 필터 성형기(90)가 고정/결합된 안착대(100)가 형성되어 있다.The rod member 80 which is integrally formed with the eccentric disk 60 and moves up and down, and vibrates according to the up and down movement of the rod member 80, and a filter molding machine 90 into which an oil filter raw material is input. Is fixed / coupled seating table 100 is formed.
여기서, 상기 필터 성형기(90)는 그 외측에 물의 배출을 용이하게 하기 위한 다수의 통공(91)이 형성된 이중 원통구조로 되어 있다.Here, the filter molding machine 90 has a double cylindrical structure in which a plurality of through holes 91 are formed on the outside to facilitate the discharge of water.
상기와 같이 구성된 필터 성형기를 참조하여 본 발명의 오일필터의 제조과정을 설명하면 다음과 같다.Referring to the manufacturing process of the oil filter of the present invention with reference to the filter molding machine configured as described above are as follows.
먼저, 용기에 펄프와 폴리에스터와 글라스화이버 재료를 투입한 후 물을 배합하여 골고루 섞어준다.First, pulp, polyester and glass fiber materials are added to the container, and then water is mixed and mixed evenly.
여기서, 상기 오일필터의 재료의 혼합비율은 펄프 75-80 중량%, 폴리에스터 8-15 중량%, 글라스화이버 10-12 중량 %로 하는 것이 바람직하다.Here, the mixing ratio of the material of the oil filter is preferably 75-80% by weight of pulp, 8-15% by weight of polyester, 10-12% by weight of glass fiber.
이어서, 상기 오일필터 성형재료를 필터성형기(90)에 투입한 후 모터(M)를 구동하게 되면 편심원판(60)의 편심회전에 의해 상기 필터성형기를 상/하로 진동시켜 성형재료에 함유된 물을 다수개의 통공(91)을 통하여 외부로 배출시켜 오일필터의 형상을 갖게 한다.Subsequently, when the oil filter molding material is introduced into the filter molding machine 90 and the motor M is driven, the filter molding machine is vibrated up and down by the eccentric rotation of the eccentric disk 60, thereby containing water contained in the molding material. It is discharged to the outside through a plurality of through-holes 91 to have the shape of the oil filter.
이어서, 필터성형기(90)에 성형된 오일필터를 가열기를 이용하여 소정시간 동안 건조시킨 후 필터성형기 외부로 인출한다.Subsequently, the oil filter formed in the filter molding machine 90 is dried for a predetermined time using a heater and then taken out to the outside of the filter molding machine.
상기 건조된 오일필터를 경화시키기 위해 수지제(페놀수지제 등)에 소정시간동안 함침시킨다.In order to cure the dried oil filter, a resin (impregnated phenol resin) is impregnated for a predetermined time.
이어서, 함침처리된 오일필터를 가열기를 이용하여 재차 건조시게 되면 본 발명의 고성능 장수명 오일필터의 제조가 완료된다.상기의 제조방법에 의해 제조된 본 발명의 오일필터는 필터재료를 진동에 의해 성형체(오일필터)를 제조함으로서 오일필터의 재료인 섬유마다 특성을 최대한 이용하여 모세관과 구멍의 저항에 의한 기포발생비율을 높혀 오일필터의 정화능력을 향상시켰고, 또한 사용 후에는 회수/처리하여 재활용이 가능하도록 하였다.Subsequently, when the impregnated oil filter is dried again by using a heater, the production of the high performance long life oil filter of the present invention is completed. The oil filter of the present invention manufactured by the above-mentioned manufacturing method is a molded article by vibrating the filter material. By manufacturing the (Oil Filter), the characteristics of each fiber, the material of the oil filter, are maximized to increase the rate of bubble generation due to the capillary and pore resistance, which improves the purification ability of the oil filter. It was made possible.
상술한 바와같이, 본 발명에 따르면 오일 정화능력이 뛰어나고 장기간 사용할 수 있어 수명이 오래가며 오일필터의 제조가 수월함과 아울러 오일필터의 재활용이 가능하다는 효과를 지니고 있다.As described above, according to the present invention has an excellent oil purification ability and can be used for a long time, the service life is long, the oil filter is easy to manufacture and the oil filter can be recycled.
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020000028176A KR100355860B1 (en) | 2000-05-24 | 2000-05-24 | A manufacturing method of oil filter having a long life |
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| KR1020000028176A KR100355860B1 (en) | 2000-05-24 | 2000-05-24 | A manufacturing method of oil filter having a long life |
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| KR100813127B1 (en) * | 2006-10-04 | 2008-03-17 | 서우산업주식회사 | Water filter composition and manufacturing method thereof |
| CN106512557B (en) * | 2016-11-23 | 2018-11-30 | 泰州龙谷信息科技有限公司 | A method of Water treatment filtration material is prepared based on non-water base Gelcasting Technique |
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