KR100512488B1 - Extraction method of magnetic paints and base film form magnetic tape - Google Patents
Extraction method of magnetic paints and base film form magnetic tape Download PDFInfo
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- KR100512488B1 KR100512488B1 KR10-2002-0035961A KR20020035961A KR100512488B1 KR 100512488 B1 KR100512488 B1 KR 100512488B1 KR 20020035961 A KR20020035961 A KR 20020035961A KR 100512488 B1 KR100512488 B1 KR 100512488B1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
- C08J11/08—Recovery or working-up of waste materials of polymers without chemical reactions using selective solvents for polymer components
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
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Abstract
본 발명은 물(58 ∼82중량%)과 수산화나트륨(8 ∼ 20중량%) 및 메틸알콜 또는 에틸알콜(10 ∼ 22중량%)이 혼합된 반응액을 이용하여 폐 자기테이프에서 자성도료를 분리 추출함으로써, 반응액의 가열 없이 자성도료를 추출할 수 있음으로 전력소비가 줄어들고 베이스필름의 변색이나 변질을 막아 재활용필름의 품질을 향상시킬 수 있는 자기테이프에서 자성도료와 베이스필름의 분리 추출방법에 관한 것으로서, 특히 폐 자기테이프를 1 ∼ 2㎠ 크기로 잘게 절단한 뒤 반응조에서 반응액과 교반시켜 폐 자기테이프를 자성도료와 베이스필름으로 분리한 뒤 자성도료는 필터프레스를 거쳐 자성도료회수조로 회수하고 베이스필름은 탈수기와 세척기 및 건조기를 거쳐 압출기에서 펠렛으로 압출하기위한 방법에 있어서, 물(58 ∼82중량%)과 수산화나트륨(8 ∼ 20중량%) 및 메틸알콜 또는 에틸알콜(10 ∼ 22중량%)가 혼합된 상온의 반응액을 반응조에 투입시켜 베이스필름의 변색 및 변질이 방지되도록 하고, 여러개의 엘리멘트가 부착되어 있는 혼합분산기(In line mixer)를 고속으로 통과하면서 폐 자기테이프 조각들의 겹쳐지고 접혀진 부분들이 펴져서 반응액과 잘 섞여 자성도료의 추출량이 증가되도록 구성되어 있다.The present invention is to separate the magnetic paint from the waste magnetic tape by using a reaction mixture of water (58 to 82% by weight), sodium hydroxide (8 to 20% by weight) and methyl alcohol or ethyl alcohol (10 to 22% by weight). By extracting, the magnetic paint can be extracted without heating the reaction solution, which reduces power consumption and prevents discoloration or deterioration of the base film, thereby improving the quality of the recycled film. In particular, the waste magnetic tape is finely cut to a size of 1 to 2 cm 2, and then stirred with a reaction solution in a reaction tank to separate the waste magnetic tape into a magnetic paint and a base film, and then the magnetic paint is recovered through a filter press into a magnetic paint recovery tank. The base film is a method for extruding pellets from the extruder through a dehydrator, a washer and a dryer, and water (58 to 82% by weight) and sodium hydroxide (8 to 20%). %) And methyl alcohol or ethyl alcohol (10 to 22% by weight) are added to the reaction mixture at room temperature to prevent discoloration and deterioration of the base film, and a mixed disperser having several elements attached (In line While passing through the mixer at high speed, the overlapped and folded portions of the waste magnetic tape pieces are unfolded and mixed with the reaction solution to increase the extraction amount of the magnetic paint.
Description
본 발명은 자기테이프에서 자성도료와 베이스필름의 분리 추출방법에 관한 것으로서, 더욱 상세하게는 비디오(Video), 오디오(Audio), 마그네틱스트립(Magnetic Stripe)등 자기테이프류의 생산공정 중 발생하는 공정 폐기물인 폐 자기테이프에서 베이스필름(Polyethylene telephthalate)과 자성도료를 분리 추출하여 재 사용함으로써, 원자재의 재활용에 의한 원가절감 및 환경오염을 방지할 수 있는 자기테이프에서 자성도료와 베이스필름의 분리 추출방법에 관한 것이다.The present invention relates to a method of separating and extracting a magnetic paint and a base film from magnetic tape, and more particularly, a process occurring during the production process of magnetic tapes such as video, audio, and magnetic stripe. Separation and extraction of base film (Polyethylene telephthalate) and magnetic paint from waste magnetic tape, which is waste, and re-use of magnetic paint and base film from magnetic tape to prevent cost reduction and environmental pollution by recycling raw materials It is about.
일반적으로 자기테이프는 자기기록재료인 침상형의 Co-r-Fe2O3(비디오테이프용), 침상형의 r-Fe2O3(오디오테이프용), Fe분말(캠코더용), Barium Ferrite(고 특성의 자기기록용 Magnetic-Stripe제조용) 등을 도료화하여 PET, PP, Nylon 등의 베이스필름에 1㎛ ∼ 3㎛ 두께로 도포 또는 진공 증착하여 사용하였다.Generally, magnetic tape is needle recording type Co-r-Fe 2 O 3 (for video tape), needle type r-Fe 2 O 3 (for audio tape), Fe powder (for camcorder), Barium Ferrite (Manufacture of high-strength magnetic recording magnetic strips) and the like were used as coatings or vacuum evaporation to base films of PET, PP, Nylon and the like with a thickness of 1 탆 to 3 탆.
자기테이프는 필름원단에 자성도료를 도포 또는 진공증착 코팅한 뒤 용도에 맞게 일정한 폭으로 절단하여 롤 상태로 말아 사용하는 것이기 때문에 제조 과정에서 도포불량 또는 절단 불량 등으로 인하여 생산량의 15 ∼ 20%가 폐기되고 있다.Magnetic tape is applied to the film fabric by applying magnetic coating or vacuum deposition coating, cutting it to a certain width according to the application, and rolling it in rolls. Therefore, 15 to 20% of the production rate is reduced due to poor coating or poor cutting during the manufacturing process. It is being discarded.
종래에는 폐 자기테이프를 전량 소각 매립하거나 또는 고형화 시켜 저급의 땔감으로 사용하였다. 그리고 자갈과 같은 형태로 고형화하여 아스팔트 또는 구조물에 일반 자갈이나 잡석 대용으로 사용하였다.In the past, the waste magnetic tape was incinerated or solidified in its entirety to be used as a low-grade firewood. And solidified in the form of gravel was used as a substitute for general gravel or rubble in asphalt or structures.
그러나 폐 자기테이프를 소각시킬 경우 환경을 오염시키고 소각 잔재물의 불법 매립 등으로 인하여 토양이 오염되는 등의 문제가 있었다. 그리고 폐기되는 자기테이프에 포함된 자성도료는 수입에 많이 의존하고 있는데 이를 전량 폐기시키거나 고형화시켜 다른 용도로 전용하기 때문에 외화를 낭비하는 등의 문제가 있었다.However, when the waste magnetic tape was incinerated, there was a problem such as polluting the environment and soil contamination due to illegal landfill of incineration residues. In addition, the magnetic paint contained in the discarded magnetic tape is heavily dependent on imports, and there is a problem such as wasting foreign currency because it is discarded or solidified and used for other purposes.
본 발명자는 이러한 종래의 문제점을 감안하여 폐 자기테이프에서 베이스필름과 자성도료를 분리 추출하는 방법을 개발하여 특허 제228639호로 등록한 바 있다. 이는 폐 자기테이프를 여러 조각으로 절단한 뒤 100℃의 반응액(수산화나트륨수용액 : NaOH)과 반응시켜 베이스필름에서 자성도료를 분리 추출하는 것이다.The present inventors have developed a method for separating and extracting the base film and the magnetic paint from the waste magnetic tape in consideration of such a conventional problem, and registered as a patent No. 228639. This is to separate the magnetic coating from the base film by cutting the waste magnetic tape into pieces and then reacting with a reaction solution at 100 ° C. (NaOH solution: NaOH).
그러나 반응액을 고온으로 가열시켜야 됨으로 전력소비가 심한 단점이 있었다.However, there is a disadvantage in that power consumption is severe because the reaction solution must be heated to a high temperature.
본 발명은 선 출원된 추출방법을 개선한 것으로서, 본 발명의 목적은 물(58 ∼82중량%)과 수산화나트륨(8 ∼ 20중량%) 및 메틸알콜 또는 에틸알콜(10 ∼ 22중량%)이 혼합된 반응액을 이용하여 폐 자기테이프에서 자성도료를 분리 추출함으로써, 반응액의 가열 없이 자성도료를 추출할 수 있음으로 전력소비가 줄어들고 베이스필름의 변색이나 변질을 막아 재활용필름의 품질을 향상시킬 수 있는 자기테이프에서 자성도료와 베이스필름의 분리 추출방법을 제공함에 있다.The present invention is an improvement of the pre-applied extraction method, the object of the present invention is water (58 to 82% by weight), sodium hydroxide (8 to 20% by weight) and methyl alcohol or ethyl alcohol (10 to 22% by weight) By separating and extracting the magnetic paint from the waste magnetic tape using the mixed reaction solution, the magnetic paint can be extracted without heating the reaction solution, which reduces power consumption and improves the quality of the recycled film by preventing discoloration or deterioration of the base film. The present invention provides a method of separating and extracting a magnetic paint and a base film from magnetic tape.
상기 목적을 달성하기 위하여 본 발명은 폐 자기테이프를 1 ∼ 2㎠ 크기로 잘게 절단한 뒤 반응조에서 반응액과 교반시켜 폐 자기테이프를 자성도료와 베이스필름으로 분리한 뒤 자성도료는 필터프레스를 거쳐 자성도료회수조로 회수하고 베이스필름은 1,2차탈수기와 세척기 및 건조기를 거쳐 압출기에서 펠렛으로 압출하기위한 방법에 있어서, 물(58 ∼82중량%)과 수산화나트륨(8 ∼ 20중량%) 및 메틸알콜 또는 에틸알콜(10 ∼ 22중량%)이 혼합된 상온의 반응액을 반응조에 투입시켜 베이스필름의 변색 및 변질이 방지되도록 하고, 관내에 여러개의 엘리멘트가 부착되어 있는 혼합분산기(In line mixer)를 설치하여 폐 자기필름 조각들이 혼합분산기를 통과하면서 겹쳐지고 접혀진 부분들이 펴져서 반응액과 잘 섞여 자성도료의 추출량이 증가되도록 구성되어 있다.In order to achieve the above object, the present invention cuts finely the waste magnetic tape into 1 to 2 cm 2 and then stirs it with the reaction solution in a reaction tank to separate the waste magnetic tape into a magnetic paint and a base film, and then the magnetic paint passes through a filter press. In the method for recovering the magnetic film recovery tank and the base film is extruded into pellets from the extruder through the first and second dehydrator, the washer and the dryer, water (58 to 82% by weight), sodium hydroxide (8 to 20% by weight) and A reaction liquid at room temperature mixed with methyl alcohol or ethyl alcohol (10 to 22% by weight) is added to the reaction tank to prevent discoloration and deterioration of the base film, and a mixed disperser having several elements in the tube (In line mixer) ), The waste magnetic film pieces pass through the mixing disperser, and the overlapped and folded parts are unfolded and mixed well with the reaction solution to increase the extraction amount of the magnetic paint. All.
이하 본 발명의 바람직한 실시예를 첨부 도면에 따라 상세히 설명하면 다음과 같다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
도 1은 본 발명 추출공정의 개략도 로서, 다음과 같은 방법으로 자성도료와 베이스필름이 추출된다.1 is a schematic view of the extraction process of the present invention, the magnetic coating and the base film is extracted in the following manner.
폐 자기테이프는 파쇄기(1)로 이송된 뒤 1 ∼ 2cm2 크기의 불규칙한 폐 자기테이프 조각(절편)으로 절단되고 송풍기(2)(콘베이어벨트 또는 버킷 엘이베이터 이송장치도 가능하다)에 의해 절편저장조(3)로 보내져 저장된다. 파쇄기(1)에서 절단과정 중 발생되는 유해 먼지는 집진기(4)에서 사이클론의 원리에 의해 집진되고 깨끗한 공기만 배출된다.The waste magnetic tape is transferred to the shredder 1, cut into pieces of irregular waste magnetic tape (sections) of 1 to 2 cm 2 size, and the section storage tank is blown by the blower 2 (conveyor belt or bucket elevator feeder is also possible). It is sent to (3) and stored. The harmful dust generated during the cutting process in the crusher 1 is collected by the cyclone principle in the dust collector 4 and only clean air is discharged.
절편저장조(3)에 모인 폐 자기테이프 조각들은 콘베이어 또는 버킷엘리베이터 등의 이송기(5)를 거쳐 반응조(6)로 보내진다. 반응조(6)에는 반응액저장조(17)로부터 공급되는 반응액이 폐 자기테이프 조각으로 살수되도록 구성되어 있으며 반응조(6) 내부의 교반이송기(6a)에 의해 이들 반응액과 폐 자기테이프 조각들이 서로 섞이면서 분리되어 폐 자기테이프 조각에서 자성도료가 분리된다.The waste magnetic tape pieces collected in the section storage tank 3 are sent to the reactor 6 via a conveyor 5 such as a conveyor or a bucket elevator. The reaction tank 6 is configured such that the reaction liquid supplied from the reaction liquid storage tank 17 is sprinkled into the waste magnetic tape pieces, and these reaction liquids and the waste magnetic tape pieces are collected by the stirring feeder 6a inside the reaction tank 6. The magnetic paint is separated from the waste magnetic tape pieces by mixing with each other.
폐 자기테이프 조각들은 분당 5 ∼ 15Kg씩 반응조(6)에 투입되며 반응액은 분당 70 ∼ 210ℓ씩 투입된다. 반응액은 물(58 ∼82중량%)과 수산화나트륨(8 ∼ 20중량%) 및 메틸알콜 또는 에틸알콜(10 ∼ 22중량%)이 혼합된 것으로 상온에서 사용된다.The waste magnetic tape pieces are added to the reactor 6 by 5-15 Kg per minute and the reaction liquid is added by 70-210 L per minute. The reaction solution is a mixture of water (58 to 82% by weight), sodium hydroxide (8 to 20% by weight), methyl alcohol or ethyl alcohol (10 to 22% by weight) and is used at room temperature.
반응조(6)에서 분리된 자성도료는 반응액회수조(7)를 거쳐 필터프레스(8)에서 여과된 뒤 자성도료회수조(9)에 모이고 반응액은 펌프(18a)를 거쳐 반응액저장조(17)로 순환된다.The magnetic paint separated from the reaction tank (6) is filtered through the reaction liquid recovery tank (7), filtered in the filter press (8), and collected in the magnetic paint recovery tank (9). Is cycled to
반응조(6)에는 펌프(sprut pump)(6b)와 관내에 엘리멘트가 여러개 부착된 혼합분산기(In line mixer)(6c)가 구비되어 반응조의 반응액과 폐 자기테이프 조각들이 강제 순환된다. 이 과정에서 접히거나 겹쳐진 자기 테이프조각들이 펴지면서 반응액과 충분히 접촉되어 자성도료가 분리된다.The reactor 6 includes a pump 6b and an in-line mixer 6c having a plurality of elements attached to the tube to force circulation of the reaction liquid and waste magnetic tape pieces of the reactor. In this process, the folded or overlapped pieces of magnetic tape are unfolded, and the magnetic paint is separated in sufficient contact with the reaction solution.
혼합분산기(6c)는 회전분산기의 일종으로 관내에 여러개의 날개가 좌우 방향으로 연속 배치되어 층류를 난류의 유체로 변환시켜 분할, 방향전환 및 뒤섞임을 연속으로 처리할 수 있는 것이다. 따라서 폐 자기테이프 조각들이 반응액과 잘 섞여 자성도료의 회수가 효과적으로 일어난다.Mixing disperser 6c is a kind of rotary disperser, in which a plurality of blades are continuously disposed in the left and right direction in a pipe, thereby converting laminar flow into a turbulent fluid to process splitting, redirection, and mixing. Therefore, the waste magnetic tape pieces are mixed well with the reaction solution to recover the magnetic paint effectively.
교반이송기(6a)에서 반응완료 후 배출되는 폐 자기테이프 조각들은 1차탈수기(12)를 거치면서 반응액이 탈수된 상태로 필터스크린(13) 쪽으로 보내진다. 필터스크린(13)는 세척수조(18)와 연결되어 깨끗한 물이 폐 자기테이프 조각들로 살수되어 이들에 묻어있는 반응액을 씻어준다. 세척수는 세척수회수조(16)와 펌프(16a)를 거쳐 반응액저장조(17)로 순환되며 이때 반응약품저장조(15)에서 반응액이 자동으로 투입되어 반응액의 농도가 일정하게 유지되도록 해준다.Waste magnetic tape pieces discharged after completion of the reaction in the agitator transporter 6a are sent to the filter screen 13 while the reaction solution is dehydrated while passing through the primary dehydrator 12. The filter screen 13 is connected to the washing water tank 18 so that clean water is sprayed into the waste magnetic tape pieces to wash the reaction liquid on them. The wash water is circulated to the reaction solution storage tank 17 through the wash water collection tank 16 and the pump 16a. At this time, the reaction solution is automatically introduced from the reaction chemical storage tank 15 so that the concentration of the reaction solution is kept constant.
필터스크린(13)에서 세척된 폐 자기테이프 조각들은 2차탈수기(14)에서 탈수된 뒤 건조기(19)에서 건조되고 압출기(20)에서 원하는 형태의 펠렛으로 압출되어 사출물의 소재로 이용된다. 이러한 펠렛은 송풍기(21)를 거쳐 펠렛저장조(22)에 저장된 뒤 필요한 만큼씩 포장 판매된다.The waste magnetic tape pieces washed in the filter screen 13 are dewatered in the secondary dehydrator 14 and then dried in the dryer 19 and extruded into pellets of a desired shape in the extruder 20 to be used as the material of the injection molding. These pellets are stored in the pellet storage tank 22 via the blower 21, and then packaged and sold as needed.
또한 2차탈수기(14)에서 탈수된 세척수는 폐수처리조(11)로 집수되며 이를 재 사용하거나 또는 규정에 맞게 폐수 처리한다.In addition, the washing water dewatered in the secondary dehydrator 14 is collected in the wastewater treatment tank 11 and reused or treated in accordance with regulations.
다음은 본 발명 회수 공정에 다른 폐 자기테이프의 자성도료와 베이스필름의 회수량을 나타낸 것이다.The following shows the recovery amount of the magnetic paint and base film of the other waste magnetic tape in the recovery process of the present invention.
<표 1> (시료 : 비디오테이프)<Table 1> (Sample: Videotape)
<표 2> (시료 : 오디오테이프)<Table 2> (Sample: Audiotape)
위의 표에서 알 수 있듯이 반응액을 가열하지 않고 자성도료와 베이스필름을 추출하기 때문에 알칼리 촉매에 의한 가수분해가 적어 손실이 적게 발생되는 것으로 나타났다.As can be seen from the above table, since the magnetic paint and the base film were extracted without heating the reaction solution, the hydrolysis by the alkali catalyst was less, resulting in less loss.
이상에서와 같이 본 발명에 따르면 폐 자기테이프로부터 추출된 베이스필름은 색상이 밝고 변질되지 않으며 면이 매끄러운 장점이 있다. 그리고 반응액을 가열시키지 않음으로 설비 및 전력의 낭비를 줄일 수 있으며, 가열된 고열의 알칼리수용액의 가수분해에 의한 손실을 줄일 수 있다. 그리고 반응조에 설치된 혼합분산기에서 폐 자기테이프 조각들이 겹쳐지지 않고 펴지기 때문에 자성도료를 미세량까지 추출해낼 수 있는 등의 효과가 있다.As described above, according to the present invention, the base film extracted from the waste magnetic tape has an advantage that the color is bright, not deteriorated, and the surface is smooth. And it is possible to reduce the waste of equipment and power by not heating the reaction solution, it is possible to reduce the loss due to hydrolysis of the heated alkaline aqueous solution. In addition, since the waste magnetic tape pieces are unfolded and unfolded in the mixed disperser installed in the reaction tank, the magnetic paint can be extracted to a minute amount.
도 1은 본 발명 추출공정의 개략도1 is a schematic diagram of the extraction process of the present invention
<도면의 주요부분에 대한 부호설명><Code Description of Main Parts of Drawing>
1 : 파쇄기 2 : 송풍기1: crusher 2: blower
3 : 절편저장고 4 : 집진기3: section storage 4: dust collector
5 : 이송기 6 : 반응조5: transfer machine 6: reactor
6a : 교반이송기 6b : 펌프6a: Stirring Machine 6b: Pump
6c : 혼합분산기 7 : 반응액회수조6c: mixed disperser 7: reaction liquid recovery tank
8 : 필터프레스 9 : 자성도료회수조8: filter press 9: magnetic paint recovery tank
10 : 펌프 11 : 폐수처리조10 pump 11 wastewater treatment tank
12 : 1차탈수기 13 : 필터스크린12: Primary dehydrator 13: Filter screen
14 : 2차탈수기 15 : 반응약품저장조14: secondary dehydrator 15: reaction chemical storage tank
16 : 세척수회수조 16a : 펌프16: washing water recovery tank 16a: pump
17 : 반응액저장조 18 : 세척수조17: reaction solution storage tank 18: washing water tank
19 : 건조기 20 : 압출기19: dryer 20: extruder
21 : 송풍기 22 : 펠렛저장조21: blower 22: pellet storage tank
Claims (2)
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| Application Number | Priority Date | Filing Date | Title |
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| KR10-2002-0035961A KR100512488B1 (en) | 2002-06-26 | 2002-06-26 | Extraction method of magnetic paints and base film form magnetic tape |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2002-0035961A KR100512488B1 (en) | 2002-06-26 | 2002-06-26 | Extraction method of magnetic paints and base film form magnetic tape |
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| Publication Number | Publication Date |
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| KR20040000936A KR20040000936A (en) | 2004-01-07 |
| KR100512488B1 true KR100512488B1 (en) | 2005-09-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101079650B1 (en) | 2009-05-21 | 2011-11-03 | 주식회사 엠에스하이텍 | Method for removing synthetic resin film from semiconductor reject die |
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| JPS5466985A (en) * | 1977-11-07 | 1979-05-29 | Nippon Zeon Co Ltd | Treatment of waste magnetic tapes |
| KR880002637A (en) * | 1986-08-18 | 1988-05-10 | 이홍균 | Recovery method of polyester film from waste magnetic recording tape |
| KR890011930A (en) * | 1988-01-18 | 1989-08-23 | 배기은 | Recovery method of polyester film in magnetic recording material |
| KR910004477A (en) * | 1989-08-26 | 1991-03-28 | 김호욱 | Extraction of iron oxide from magnetic tape using chemicals such as alkali (caustic soda NaOH) |
| JPH0957233A (en) * | 1995-08-21 | 1997-03-04 | Asahi Eng Co Ltd | Treatment of waste magnetic tape |
| KR19980014810A (en) * | 1996-08-16 | 1998-05-25 | 박만승 | A method for recovering iron oxide and PET film from waste magnetic recording tape or waste water sludge produced therefrom |
| KR19990011640A (en) * | 1997-07-24 | 1999-02-18 | 김영진 | Extraction and Separation Method of Magnetic Recording Materials from Waste Magnetic Tapes |
| KR100228639B1 (en) * | 1997-07-24 | 1999-11-01 | 김영진 | Method of separating magnetic oxide and p.e.t film from tape waste |
| KR102130124B1 (en) * | 2016-06-22 | 2020-07-03 | 가부시키가이샤 스즈키 | Mounting device |
-
2002
- 2002-06-26 KR KR10-2002-0035961A patent/KR100512488B1/en not_active IP Right Cessation
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5466985A (en) * | 1977-11-07 | 1979-05-29 | Nippon Zeon Co Ltd | Treatment of waste magnetic tapes |
| KR880002637A (en) * | 1986-08-18 | 1988-05-10 | 이홍균 | Recovery method of polyester film from waste magnetic recording tape |
| KR890011930A (en) * | 1988-01-18 | 1989-08-23 | 배기은 | Recovery method of polyester film in magnetic recording material |
| KR910004477A (en) * | 1989-08-26 | 1991-03-28 | 김호욱 | Extraction of iron oxide from magnetic tape using chemicals such as alkali (caustic soda NaOH) |
| JPH0957233A (en) * | 1995-08-21 | 1997-03-04 | Asahi Eng Co Ltd | Treatment of waste magnetic tape |
| KR19980014810A (en) * | 1996-08-16 | 1998-05-25 | 박만승 | A method for recovering iron oxide and PET film from waste magnetic recording tape or waste water sludge produced therefrom |
| KR19990011640A (en) * | 1997-07-24 | 1999-02-18 | 김영진 | Extraction and Separation Method of Magnetic Recording Materials from Waste Magnetic Tapes |
| KR100228639B1 (en) * | 1997-07-24 | 1999-11-01 | 김영진 | Method of separating magnetic oxide and p.e.t film from tape waste |
| KR102130124B1 (en) * | 2016-06-22 | 2020-07-03 | 가부시키가이샤 스즈키 | Mounting device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101079650B1 (en) | 2009-05-21 | 2011-11-03 | 주식회사 엠에스하이텍 | Method for removing synthetic resin film from semiconductor reject die |
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|---|---|
| KR20040000936A (en) | 2004-01-07 |
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